The two actions that are examples of science influencing technology are:
A) Using the internet to publish and share new scientific discoveries.
D) Using observations about plant seed structures to develop hook-and-loop fasteners. Option A and D
These examples illustrate how scientific advancements and knowledge have influenced the development and application of technology.
Using the internet to publish and share new scientific discoveries is a prime example of science influencing technology. The internet has revolutionized the way scientific information is disseminated, allowing researchers to publish their findings rapidly and share them globally.
This has facilitated collaboration, accelerated the spread of scientific knowledge, and enhanced the efficiency of scientific communication. The internet has also given rise to platforms for open-access journals and online scientific communities, enabling greater accessibility and the democratization of scientific information.
Using observations about plant seed structures to develop hook-and-loop fasteners is another instance of science influencing technology. Scientists studying the natural world have observed the mechanisms by which certain plants disperse their seeds.
One such example is the observation of burrs or burdock plants that use tiny hooks to attach to animal fur or clothing. Inspired by these observations, scientists developed hook-and-loop fasteners, commonly known as Velcro, which mimics the natural hooking mechanism of the plant seeds.
This technology has found widespread applications in various fields, including clothing, aerospace, and medicine, offering a versatile and efficient fastening solution.
These examples highlight the reciprocal relationship between science and technology, where scientific discoveries and knowledge contribute to technological advancements, while technological developments, in turn, provide new tools and capabilities for scientific research and exploration.
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For the chemical reaction shown,2H,0,(1) + N, H.(I) 4H,O(g) + N, (8)determine how many grams of Nare produced from the reaction of 8.82 g of H2O2 and 6,81 g of N2H4.N2 produced:8TOOLSx10'
In this question, we have the following reaction:
2 H2O2 + N2H4 -> 4 H2O + N2
The reaction is already balanced, the molar ratios are:
2 H2O2 = 1 N2H4
2 H2O2 = 1 N2
1 N2H4 = 1 N2
We have the following mass given in the question and the molar mass:
8.82 grams of H2O2, molar mass = 34.01g/mol
6.81 grams of N2H4, molar mass = 32.04g/mol
N2 molar mass = 28.02g/mol
Now we need to find the limiting reactant, we will start by the H2O2
34.01g = 1 mol
8.82g = x moles
x = 0.26 moles of H2O2 in 8.82 grams
According to the molar ratio, we will need the number of moles of H2O2 divided by 2 in order to find the number of moles of N2H4
0.26/2 = 0.13 moles of N2H4
Now we need to check if we have 0.13 moles of N2H4 or we have more of it:
32.04g = 1 mol
6.81g = x moles
x = 0.212 moles of N2H4, but we only need 0.13 moles, therefore we have an excess of N2H4 and H2O2 is the limiting reactant
Now we need to find the final mass of N2, we will do that by using the number of moles of the limiting reactant, H2O2 0.26 moles, and according to the molar ratio between H2O2 and N2, we need 0.13 moles of N2 being produced, using this number of moles and its molar mass, we can find the final mass:
28.01g = 1 mol
x grams = 0.13 moles
x = 3.64 grams of N2 is produced
Answer = 3.64 grams of N2
Based on the position of the Earth, moon, and Sun in the image above, which statement describes what will occur?
A. A neap tide will occur during a new moon or full moon because the gravitational attraction between the Sun and Moon on the water is the weakest.
B. A neap tide will occur during a 1st or 3rd quarter moon because the gravitational attraction between the Sun and Moon on the water is the strongest.
C. A spring tide will occur during a 1st or 3rd quarter moon because the gravitational attraction between the Sun and Moon on the water is the weakest.
D. A spring tide will occur during a new moon or full moon because the gravitational attraction between the Sun and Moon on the water is the strongest.
Based on the position of the Earth, moon, and Sun, a spring tide will occur during a new moon or full moon because the gravitational attraction between the Sun and Moon on the water is the strongest, therefore the correct answer is option D.
What is an eclipse?When a planetary body passes in front of another planetary body and is visible from a third planetary body, an eclipse is created.
Because the gravitational force between the Sun and Moon on the ocean is the largest during a new moon or full moon, a spring tide will occur during these times based on the positions of the Earth, moon, and Sun. Option D is the right response.
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Shrimp that live in the cold waters off Alaska will die if introduced into warm water. One likely reason these shrimp do not survive is that enzymes in the shrimp
Shrimp living in cold water of Alaska will die if introduced into warm water because the shape of enzyme changes with change in temperature.
Shrimp are crustaceans with elongated bodies and a on the whole swimming mode of locomotion – maximum typically Caridea and Dendrobranchiata of the decapod order, although a few crustaceans outside of this order are known as "shrimp".
Shrimp are considerable and abundant. There are hundreds of species tailored to a wide variety of habitats. They can be observed feeding near the seafloor on most coasts and estuaries, as well as in rivers and lakes.
The cold-water shrimp lives close to the seabed and prefer a water temperature among 0 and 8 degrees. It is specially derived from plankton, krill and micro-worms. it's miles born like a male, but becomes a lady after three to four years – consequently the cold-water shrimp is a hermaphrodite.
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7. What type of solid will each of the following substances form in its solid state? Choices to consider are
metallic, ionic, covalent, or molecular solids.
a. C₂H6
b. Na₂O
c. SiO₂
d. CO₂
e. N₂O5
f. NaNO3
g. Al
h. C(diamond)
i. SO₂
9:26 AM M.
B
LTE
Exercise_10.3_-_Intermolecular_...
Name:
KEY
AP Chemistry
Exercise 10.3
Intermolecular Forces
Date:
Per:
Types of Solids
Intermolecular Force(s) Between Particles
1. Metallic Crystals (Metals)
Metallic bonding: Valence electrons form mobile sea of electrons which comprise the metallic bond.
Ex: Na, Cu, Fe, Mn 2. Ionic Crystals (Ionic Solids)
Ionic Bonding/Ion-dipole: Attraction of charged ions for one another. Lattice energy is a measure of ionic bond strength. Attractive force between an ion and
Ex: NaCl, MgCl2, MgO
an oppositely charged end of a permanent dipole possessed by a neutral
molecule.
3. Network Covalent Crystals
Network covalent bonding. Network solids are extremely hard compounds with very high melting and boiling points due to their endless 3-dimensional network
Ex: C(diamond), SiC(s), SiO2(quartz) 4. Molecular Crystals
of covalent bonds. Hydrogen bonding: Hydrogen bonds are weaker than covalent bonds, but stronger than (b) or (c) below. A hydrogen atom attached to one of these three
One or more of the following:
(a) Need H bonded to O, N or F:
(a)
Ex: H₂O, HF, NH3.
elements possesses a substantial partial positive charge. The positive end of each
of the bond dipoles (H atom) is capable of strongly interacting with an unshared
electron pair possessed by N, O, or F atom of an adjacent molecule.
(b) CHF3, CH,COCH, (acetone) and H₂O, HF, NHS.
(b) Dipole-dipole forces: these forces act between polar molecules. They are much
weaker than hydrogen bonding. Positive end of permanent dipole on one molecule aligns itself with negative end of permanent dipole on another molecule. Only significant in effect when molecules are close together. They usually dominate over (c) below.
(c) CH (benzene),
(c) Dispersion forces (induced dipole-induced dipole or London dispersion forces): universal force of attraction between instantaneous dipoles. These forces are the compounds from (a) and weak for small, low-molecular weight molecules, but greater for heavy, long, and/or highly polarizable molecules with increasing molecular volume. Short range attractive forces between molecules resulting from momentary mutual distortion (polarization) of electron clouds. Dispersion forces: See Section 4(c) above.
polyethylene, 12, F2, and all
(b) above.
5. Atomic Crystals Ex: He, Ne, Ar, Kr, Xe
*Note: Many of the compounds given as examples are not solids at room temperature. But if you cool them down to a low enough temperature, eventually they will become solids.
2 FIXED THIS PART
The physical properties of a substance depend on its intermolecular forces. The stronger the forces between particles,
a.
b. the higher lower the boiling point.
C.
the higher lower the melting point.
the higher Tower the vapor pressure.
the higher lower the viscosity (resistance to flow). the higher lower the surface tension (resistance to an increase in surface area).
d.
2.
What type of crystal will each of the following substances form in its solid state? Choices to consider are metallic, ionic,
covalent, or molecular crystals. (a) C₂H₂ MOLECULAR
(d) CO₂
MOLECULAR
(8) AI METALLIC
(b) Na2O IONIC
(e) N₂Os
MOLECULAR (f) NaNO, IONIC
(h) C(diamond) COVALENT
(c) SiO2
COVALENT
(1) SO₂ MOLECULAR
3. Circle all the compounds in the following list which would be expected to form intermolecular hydrogen bonds in the liquid state:
(CHOCH
(dimethyl ether)
(b) CH4 H
(c) HF (d) CH,CO,H
(e) Brz
(f) CH3OH (methanol)
H-C-O-C-H Revised: 2019-02-21
H-C-H
C-C-O-H
:Br
no N, O, F to H BOND
H-F: H
H
H
H
Chemistry
Exercise 10.3
Name:
Date:
Per
A gas is confined to a cylinder under constant atmospheric pressure.When 600J of heat IS added to the gas . It expands and does 140J of Work on the surroundings . What are the values of ∆H and ∆E.
As heat is being added, the value of q (that is equal to ∆H) is positive:
[tex]\Delta H=600\text{ J}[/tex]To find ∆E we need to calculate the difference between ∆H and w (work):
[tex]\Delta E=600J-140J=460J[/tex]Is helium, vinegar,iron,methane,coffee,table sugar and dry ice are mixture, compound or element?
STEP-BY-STEP EXPLANATION:
Firstly, we need to define a mixture, compound, and element
Mixture: A mixture is defined as a substance that contains two or more constituents that are physically combined together.
Compound: A compound is defined as a substance that contains two or more elements that are chemically combined together.
Element: An element is defined as a substance that cannot be split into simpler units by an ordinary chemical reaction.
The next thing is to group the various substance into the mixture, compound, and element
Helium ----------- Element
Vinegar -------- Compound
Iron ------------ Element
Methane ----- compound
Coffee ------- Mixture
Dry -ice ------- compound
Table sugar ---- Compound
How many grams are in 1.5 x 1016 atoms of sulfur (S)?
A.
1.3 x 106grams
B.
8.0 x 10-7 grams
C.
7.9 x 10-8 grams
D.
2.9 x 1041 grams
Answer:
the answer is B
Explanation:
because i just choose the answer
How many joules are required to increase the temperature of 30.0 g of water from 10⁰ C to 100⁰ C vapors.
Answer
11302.2 joules
Explanation
Given:
Mass of water = 30.0 g
Initial temperature, T₁ = 10⁰ C
Final temperature, T₂ = 100⁰ C
Increase in temperature, ΔT = T₂ - T₁ = 100⁰ C - 10⁰ C = 90⁰ C
What to find:
The energy in joules required to increase the temperature of the water.
Step-by-step solution:
The joules required to increase the temperature of the water can be calculated using the formula:
q = mcΔT
Where q is the joules of energy required.
m is the mass of water = 30.0 g
c is the specific heat of water = 4.186 J/g ⁰C
ΔT is the temperature rise = 90 ⁰C
∴ q = 30.0 g x 4.186 J/g ⁰C x 90 ⁰C
q = 11302.2 joules
Hence, 11302.2 joules are required to increase the temperature of 30.0 g of water from 10⁰ C to 100⁰ C vapors.
Each of the following phrases matches one of the models below. Match the statement with its appropriate model.
What is the molar concentration of Fe2+ ion in an aqueous solution if 37.50 mL of 0.109 M KBrO3 is required for complete reaction with 13.00 mL of the Fe2+ solution? The net ionic equation is:
6Fe2+(aq)+BrO3−(aq)+6H+(aq)→6Fe3+(aq)+Br−(aq)+3H2O(l).
The molar concentration of iron ions in aqueous solution of 0.109 M potassium bromate is 0.3144 M.
What is molar concentration?Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.
The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.
In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.
In case of two solutions given and volume or molarity of one solution is to be determined it is calculated as,
M₁V₁=M₂V₂
On substitution in above formula , M₁=0.109×37.50/13=0.3144 M
Hence, the molar concentration of iron ions is 0.3144 M.
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Complete the equation for the dissociation of the electrolyte AgNO3(aq) . Omit water from the equation because it is understood to be present.
The equation of the dissociation of the compound is [tex]AgNO_{3} (s)---- > Ag^{+} (aq) + NO_{3^{-} (aq)[/tex]
What is dissociation?The term dissociation has to do with the process by which a substance is broken up into its constituents. Now we know that the electrolytes are composed of ions. These ions are the charge carriers that are responsible for the fact that the solution is able to be a conductor of the electric current as we know the electrolytes to be as usual.
We can now write the equation of the dissociation from the equation; [tex]AgNO_{3} (s)---- > Ag^{+} (aq) + NO_{3^{-} (aq)[/tex]. The water has been omitted as was instructed in the question.
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The equation for the dissociation of the electrolyte AgNO₃(aq) is:
[tex]\rm AgNO_3\rightarrow Ag ^+ + NO_3 ^-[/tex]
What is dissociation?Dissociation is defined as a broad process in which molecules (or ionic compounds like salts, or complexes) split or separate into different elements like atoms, ions, or radicals, typically in a reversible way.
We now know that ions make up the electrolytes. These ions are the charge carriers that make it possible for the solution to serve as a conductor of the electric current in the manner that we have come to expect from electrolytes.
Thus, the equation for the dissociation of the electrolyte AgNO₃(aq) is:
[tex]\rm AgNO_3\rightarrow Ag ^+ + NO_3 ^-[/tex]
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A 50.0 gram sample of NaOH is dissolved in 0.600 L of water. What volume of this solution would be needed to create a 1.50 L solution that is 0.200 M NaOH?
Answer:
0.144 L (144 mL).
Explanation:
First, let's calculate the molarity of the solution of 0.600 L of water with 50.0 g of NaOH. But first, let's calculate the number of moles of 50.0 g of NaOH using its molar mass which is 40 g/mol (you can calculate the molar mass of a compound using the periodic table):
[tex]50.0\text{ g NaOH}\cdot\frac{1\text{ mol NaOH}}{4\text{0 g NaOH}}=1.25\text{ moles NaOH.}[/tex]The next step is to use the formula of molarity:
[tex]Molarity\text{ \lparen M\rparen=}\frac{mole\text{s of solute}}{liter\text{s of solution}}=\frac{mol}{L}.[/tex]And replace the given data (moles of solute = 1.25, liters of solution = 0.600 L):
[tex]Molarity=\frac{1.25\text{ moles}}{0.600\text{ L}}=2.08\text{ M.}[/tex]We want to find the volume that is needed to create a 1.50 L (volume) of 0.200 M NaOH. We have to use the formula:
[tex]C_1V_1=C_2V_2.[/tex]Where C indicates the concentration in M and V the volume in L. In this case, our unknown value can be V1 but remember that the concentration of this solution (C1) was 2.08 M and we have to equal this to the concentration (0.200 M) and volume (1.50 L) of the wanted solution. It will look like this:
[tex]V_1=\frac{C_2V_2}{C_1}=\frac{0.200\text{ M}\cdot1.50L}{2.08\text{ M}}=0.144\text{ L.}[/tex]The volume required would be 0.144 L (144 mL).
Determine the number of atoms or molecules in the following: a. 20.0 grams of H2 b. 54.30 grams of Sr c. 84.6 grams of Na2CO3 d. 9.432 kg of BeO e. 0.75 moles of Ca3(PO4)2
The number of atoms or molecules in the compounds are as follows;
a) 6.02 * 10^24
b) 3.7 * 10^2
c) 3.7 * 10^2
d) 2.27 * 10^23
e) 4.5 * 10^23
What is the number of atoms?We know that atoms are the smallest parts of a substances that can take part in a chemical reaction. We also know that one mole of a substance must contain the Avogadro's number of atoms in the molecule.
Let us now find the number of atoms in each case;
a) 20 g/2 g/mol * 6.02 * 10^23
= 6.02 * 10^24
b) 54.30 g/88 g/mol * 6.02 * 10^23
= 3.7 * 10^2
c) 84.6 g/106 g/mol * 6.02 * 10^23
= 4.80 * 10^23
d) 9.432 * 10^3 g/25 g/mol * 6.02 * 10^23
= 2.27 * 10^23
e) 0.75 moles * 6.02 * 10^23
= 4.5 * 10^23
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Calculate the enthalpy change for the reaction P4O6(s)+2O2(g)→P4O10(s)
given the following enthalpies of reaction:
P4(s)+3O2(g)→P4O6(s)ΔH=−1640.1kJ
P4(s)+5O2(g)→P4O10(s)ΔH=−2940.1kJ
Considering the Hess's Law, the enthalpy change for the reaction P₄O₆ (s) + 2 O₂ (g) → P₄O₁₀ (s) is -1300 kJ.
Definition of Hess's LawHess's Law indicates that the enthalpy change in a chemical reaction will be the same whether it occurs in a single stage or in several stages. That is, the sum of the ∆H of each stage of the reaction will give us a value equal to the ∆H of the reaction when it occurs in a single stage.
Enthalpy change in this caseIn this case you want to calculate the enthalpy change of:
P₄O₆ (s) + 2 O₂ (g) → P₄O₁₀ (s)
which occurs in two stages.
You know the following reactions, with their corresponding enthalpies:
Equation 1: P₄(s) + 3 O₂(g) → P₄O₆ (s) ΔH = -1640.1 kJ
Equation 2: P₄(s) + 5 O₂(g) → P₄O₁₀ (s) ΔH = -2940.1 kJ
Because of the way formation reactions are defined, any chemical reaction can be written as a combination of formation reactions, some going forward and some going back.
First, to obtain the enthalpy of the desired chemical reaction you need one mole of P₄O₆ on reactant side and it is present in first equation on the product side. So it is necessary to locate the P₄O₆ on the reactant side (invert it). When an equation is inverted, the sign of delta H also changes.
Now, you need one mole of P₄O₁₀ on product side and it is present in second equation so let's write this as such.
In summary, you know that two equations with their corresponding enthalpies are:
Equation 1: P₄O₆ (s) → P₄(s) + 3 O₂(g) ΔH = 1640.1 kJ
Equation 2: P₄(s) + 5 O₂(g) → P₄O₁₀ (s) ΔH = -2940.1 kJ
Adding or canceling the reactants and products as appropriate, and adding the enthalpies algebraically, you obtain:
P₄O₆ (s) + 2 O₂ (g) → P₄O₁₀ (s) ΔH= -1300 kJ
Finally, the enthalpy change in this case is -1300 kJ.
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PLEASE ANSWER ASP I ONLY HAVE A FEW MINUTES A student wants to determine the effect of mass on kinetic energy. She will drop two balls of the same size into a pool of
water. Which investigation method should the student use? (1 point)
O She should drop two balls of the same mass from different heights.
O She should drop two balls of the same mass from the same height.
O She should drop two balls with different masses from the same height.
She should drop two balls with different masses from different heights.
Ite
Ite
Answer:
The answer is C) She should drop two balls with different masses from the same height.
Explanation:
Since they want to test the effect of MASS on kinetic energy, they should have different masses but have them both fall from the same height in order to see the difference the mass makes.
A student should drop two balls with different masses from the same height to determine the effect of mass on kinetic energy. Therefore, option (C) is correct.
What is the kinetic energy and potential energy?Kinetic energy (KE) can be described as the energy possessed by a moving body due to its motion. Work will be done when there is a change in the kinetic energy of an object. The kinetic energy is represented as K.E. = ½mv² where ‘m’ is the mass and ‘v’ is the velocity of the object.
Potential Energy (P.E.) can be defined as the energy stored by an object due to the position of the object and can be written in the form of an equation as P.E. = mgh where ‘m’ is the mass, ‘h’ is the height in meters and ‘g’ is the acceleration due to gravity.
The kinetic energy of an object depends upon its mass of the object. Therefore, to understand the effect of mass on kinetic energy, drop two balls with different masses from the same height.
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how many
times would you have to drive back and forth to
travel 186,000 miles
If you drove a car that got 30 miles per gallon, you would have to drive 6,200 miles to travel 186,000 miles.
What is travel?
Travel is the movement of people between geographically distant regions. Travel can be done on foot, bicycle, automobile, rail, boat, bus, airline, ship, or other mode of transportation, with or without luggage, and can be one way or round trip. As in the case of tourism, travel might sometimes include relatively short stops between subsequent movements. The meaning of the word "travel" is very certainly lost to history. The name "travel" may have sprung from the Old French word travail, which meant "labour." According to the Merriam-Webster dictionary, the word travel was first used in the 14th century.
If you drove a car that got 30 miles per gallon and you had a tank that held 20 gallons, you would have to drive 6,200 miles to use up a full tank of gas. You would need to drive back and forth 186,000 / 6,200 = 30 times to travel 186,000 miles.
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Consider the thermochemical equation given
below:
CH4 (g) + 2 O2(g) → CO₂ (g) + 2 H₂O(g) ΔΗ = -802 kJ
What is the enthalpy change (AH) if 65.8 grams of O₂ is allowed to react with excess CH4 ?
-1648.11 kJ is the enthalpy change (ΔH) if 65.8 grams of O₂ is allowed to react with excess CH₄.
What is Chemical Reaction ?Chemical reaction is a type of reaction in which one or more substances means reactants are converted to one or more different substances means products are formed.
The given reaction is
CH₄ (g) + 2O₂(g) → CO₂ (g) + 2H₂O(g) ΔΗ = -802 kJ
How to find the number of moles ?We find the number of moles by using this formula
Number of moles = Given Mass/Molar Mass
Here,
Given mass of oxygen = 65.8 g
Molar mass of oxygen = 16 g/mol
Now,
Number of moles = Given Mass/Molar Mass
= 65.8/16
= 4.11 moles
2 moles of O₂ releases 802 kJ of energy.
So, 4.11 moles of O₂ releases = [tex]\frac{802}{2} \times 4.11[/tex]
= 1648.11 kJ
Hence enthalpy change (ΔH) = -1648.11 kJ
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What do you notice about the average seismic wave speeds at a depth of 90 km in the locations where volcanoes have occurred? Does this support or refute the idea that the heat for volcanic magma is a deep feature?
The average seismic wave speeds at a depth of 90 km in volcanic areas, They typically travel at speeds ranging from 1 to 14 km/h. The slower values represent a P-wave traveling in water, while the higher numbers represent a P-wave speed near the Earth's mantle's core.
How fast do seismic waves travel?The average seismic wave speeds at a depth of 90 km in volcanic areas, They typically travel at speeds ranging from 1 to 14 km/h. The slower values represent a P-wave traveling in water, while the higher numbers represent a P-wave speed near the Earth's mantle's core.Seismic velocities are affected by the material properties of the media through which seismic waves pass, such as composition, mineral phase and packing structure, temperature, and pressure. Seismic waves travel faster through denser materials and, as a result, travel faster with depth.Both earthquake epicenters and volcanoes are located in the same area. Earthquakes do not occur at random on the earth's surface. They are typically concentrated in small areas. Some are near the edges of continents, others are in mid-continents, and still others are in oceans.To learn more about : Seismic waves
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The reaction of carbon dioxide to form carbon monoxide and oxygen is what type of reaction?2CO2(g) → 2CO(g) + O2(g)decompositionoxidationcombinationsingle replacementdouble replacement
Answer
Decomposition
Explanation
2CO2(g) → 2CO(g) + O2(g)
The reaction of carbon dioxide to form carbon monoxide and oxygen as shown above is a decomposition reaction.
A decomposition reaction can be defined as a chemical reaction in which one reactant breaks down into two or more products.
In the reaction, a single reactant carbon dioxide breaks down or decomposes to form carbon monoxide and oxygen.
What do these two changes have in common?
roasting a marshmallow over a campfire
boiling sugar to make caramel
Select all that apply.
A: Both conserve mass.
B: Both involve chemical bonds breaking.
C: Both are caused by heating.
D: Both result in a different type of molecule than was there
before.
When compounds are heated they undergo physical changes but new molecules created or existing molecules lost. The common things for the given two changes are they both conserve mass and caused by heating.
What are physical changes?Physical changes include, change in state or phase of a substance. For example, boiling a liquid converts the liquid state into gaseous state. Similarly melting, crystallization, solidification etc. are physical changes.
During a physical change, no bond making or breaking occurring as well as no molecules or atoms are created. Similarly existing molecules cannot be lost.
According mass conservation law, during a chemical or physical change mass of a substance remains constant. Thus reactants have the same as total mass of products.
Therefore, the two common things in the two changes are they are caused by heating and both conserve mass. Thus, option A and C are correct.
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Fill in the [?]:1,516,000,000 nm = [?] mGive your answer in standard form.Enter
1,516,000,000 nm = 1.516 m
Which in standard form is:
[tex]1516x10^{-3}\text{ m}[/tex]Only this one question don’t need to write an entire goddam 15 sentences but just give me a correct answer
A given element must have the same number of protons as neutrons and electrons, this is not a requirement. No other element has an atom with two protons besides helium, which has two protons in every atom.
How do electrons work?An electrical force keeps electrons in their shells. An atom's protons and electrons are drawn to one another. They are both electrically charged. Electrons have a negative charge (-), while protons have a positive charge (+).
Where can you find electrons?Electrons are present outside the atom's nucleus, in contrast to protons and neutrons, which are contained inside the nucleus at its center. Negative electrons are drawn to the positive nucleus because the electric charges of opposite polarity attract one another.
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The complete question is -
Does a given element always have the same number of each particle? Why or why not? Using periodic table, give some specific examples.
How doesthe atomic number of an element becomes its identification?
Based on the number of protons present in its nucleus
Explanations:What is an atomic number?
An atomic number is simply defined as the number of protons present in the nucleus of an atom.
Based on the given definition, we can say that the atomic number of an element is used to identify the number of protons in an atom. These are the defining characteristics of such an element.
The atom of an element can either lose or gain neutrons or electrons without having any effect on its elemental identity. However, if the number of protons of an atom changes, the atom will become a different element entirely.
Based on the above context, we can conclude that the atomic number of an element becomes its identification according to the number of protons present in its nucleus
Answer:
The three main atomic particles are protons, neutrons and electrons. For the same element, the neutrons can be different, resulting in different isotopes. The electrons can be different too, either in neutral state or positively (or negatively) charged. Only the number of protons remain the same. If the number of protons change, the element would become a different element. Therefore, the atomic number, which represents the number of protons, becomes the element's identification.
Explanation:
What is the total number of atoms represented in
the formula below?
2Sr3(PO4)2
There are 30 atoms in 2Sr3(PO4)2.
In the given formula there are 2 molecules of Sr3(PO4)2.
To find the number of atoms in molecules by looking at the molecular formula, we must count the presence of each atom in the molecule.
To calculate the total number of atoms, we first calculate the number of atoms for 2Sr3(PO4)2.
Number of Strontium atoms = 3*2 = 6
Number of Phosphorus atoms = 1*2*2 = 4
Number of Oxygen atoms = 4*2*2 = 16
Total number of atoms =6+4+16=30
So, there are 30 atoms in 2Sr3(PO4)2.
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6.0 x 10^4 ÷ 4.0 x 10^8
Scientific notation
As per scientific notation rules,scientific notation of 6.0×10^4÷4.0×10^8 value is 1.5×10[tex]^-4[/tex].
What is scientific notation?Scientific notation is defined as a way of expressing numbers which are too large or too small so that they can be easily written in decimal form. It can be referred to the scientific form or the scientific index form or even the standard form.
Base ten notation is used by scientists, engineers as it helps in simplification of arithmetic operations. It contains the significant figures which include all non-zero numbers , the zeroes between significant digits and zeroes which are needed to be significant.
In scientific notation, the base should always be ten. The exponent should be a non-zero integer and it can be either positive or negative.
For example , in the given problem 6.0×10^4=60,000 and 4.0×10^8=40,00,00,000
∴60,000÷40,00,00,000=0.00015 which in scientific notation is expressed as 1.5×10[tex]^-4[/tex]
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3. Which of these describes a chemical
change? sc.8.P.9.2
A baking cookies
B melting ice
C Cutting apple slices
D mowing the grass
Write a balanced chemical equation, including state symbols, for the reaction between
zinc metal and sulfuric acid.
A balanced chemical equation [tex]Zn (s) Zinc + H_{2} SO _{4 }\ (aq) Sulfuric acid → ZnSO _{4}\ ( aq) Zincsulfate (aq) + H {_2} (g) Hydrogen.[/tex]
What is zinc?Zinc is a transition metal with atomic number 30 and is shown in the periodic table with the symbol "Zn". Zinc is one of the cheap metals that we use every day. It is part of the elements that humans have expanded over thousands of years.
Zinc (Zn) is a soft metal with a particularly stable electrical structure (fully filled stable configuration). As a result, their metal joints are weak. They have a high oxidizing power up to oxidation state 2.
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Which scientist is known for developing the planetary model of the atom?
Answer: Neils Bohr
Explanation: Development of the Atomic Theory. In 1913, Neils Bohr, a student of Rutherford 's, developed a new model of the atom. He proposed that electrons are arranged in concentric circular orbits around the nucleus. This model is patterned on the solar system and is known as the planetary model.
A copper coin is heated and placed in a foam-cup calorimeter containing 32.0 mL of water at 22.0°C. The water reaches a maximum temperature of 24.0°C. How many joules of heat are released by the coin?
The joules of heat released by the copper coin will be the same as the ones absorbed by the water.
To find the heat absorbed by the water can be found using the following formula:
[tex]Q=mCp(T2-T1)[/tex]Where Q is the heat absorbed or released, m is the mass, Cp is the specific heat of the substance and T2 and T1 are the final and initial temperatures of the substance.
m can be found using the given volume of water and its density (1g/mL), Cp is 4.18J/g°C and T2 and T1 are given:
[tex]m=32.0mL\cdot\frac{1g}{mL}=32.0g[/tex][tex]\begin{gathered} Q=32.0g\cdot\frac{4.18J}{g\degree C}\cdot(24.0\degree C-22.0\degree C) \\ Q=267.52J \end{gathered}[/tex]It means that the copper coin released 267.52 joules.
Cinnamon owes its flavor and odor to cinnamaldehyde (C9H8O). Determine the boiling point elevation of a solution of 97.1 mg of cinnamaldehyde dissolved in 1.00 g of carbon tetrachloride (Kb = 5.03°C/m).______ °C
Step 1
The equation for the boiling point elevation used here:
[tex]\Delta Tb\text{ = Kb x m }[/tex]m = molality, which is calculated as follows:
[tex]m\text{ = }\frac{moles\text{ of solute}}{Mass\text{ of solvent \lparen kg\rparen}}[/tex]Kb = boiling constant
-------------------------
Step 2
Information provided:
Solute = C9H8O
Solvent = carbon tetrachloride
Mass of solute = 97.1 mg
(1 g = 1000 mg => 97.1 mg x (1 g/1000 mg) = 0.0971 g)
Mass of solvent = 1.00 g
(1 kg = 1000 g => 1.00 g x (1 kg/1000 g) = 1x10^-3 kg)
---
Information needed:
The molar mass of solute = 132.1 g/mol (please, the periodic table is useful here)
-------------------------
Step 3
The number of moles of solute: n
n = mass of solute/the molar mass of solute = 0.0971 g/ 132.1 g/mol = 7.35x10^-4 moles
----
Molality, m:
m = moles of solute/mass of solvent (kg) = 7.35x10^-4 moles/1x10^-3 kg = 0.735 moles/kg or m
----
The boiling point elevation:
ΔTb = Kb x m = 5.03 °C/m x 0.735 m = 3.69 °C
Answer: ΔTb = 3.69 °C
