Answer
D. If the temperature decreases, then crickets will chirp less.
Explanation
A hypothesis is a testable guess about the relationship between two or more variables. As the temperature rises, it becomes easier to reach a certain activation energy, thereby allowing chemical reactions, such as the ones that allow a cricket to chirp, to occur more rapidly. Conversely, as the temperature falls, the reaction rates slow, causing the chirping to diminish along with it. Therefore the above statem
Which diagram represents an element that is likely to form covalent bonds? A purple circle with 2 concentric circles around it. The inner circle has 2 small green spheres. The outer circle has 1 small green sphere. A purple circle with 3 concentric circles around it. The inner circle has 2 small green spheres. The middle circle has 8 small green spheres. The outer circle has 5 small green spheres. A purple circle with 3 concentric circles around it. The inner circle has 2 small green spheres. The middle circle has 8 small green spheres. The outer circle has 8 small green spheres.
Diagram represents an element that is likely to form covalent bonds is a purple circle with 3 concentric circles around it
Covalent bond means it consist of mutual sharing of one or more pair of electron between two atom and covalent bond diagram consist of in the middle the small circle which is purple color and three concentric circles around the purple circle and covalent bond diagram show the electron dot formulas and they often reffred to as lewis structure and are little different than electron dot formula used to represent the ionic bond
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3. A photon of light has an energy 4.125 x 10-19J. Calculate the wavelength in nanometers.
In order to answer this question we will use the Energy formula, but we will find the wavelength through this formula, the formula is:
E = hc/λ
where:
E = energy in joules, 4.125*10^-19
h = Planck's constant, 6.626*10^-34
c = the speed of light, which is also a constant, 2.998*10^8
λ = is the wavelength
We will make the arrangements to find wavelength
λ = hc/E
Now let's add our values to the formula
λ = (6.626*10^-34) * (2.998*10^8)/4.125*10^-19
λ = 4.81*10^-7
1 nanometer is equal to 1*10^-9 meters
Therefore we have 481 nanometers
PLEASE ANSWER:
A student pipettes 5 ml of vinegar into a erleyenmeyer flask, adds indictator and 25 ml of distilled water and titrates it with 0.1098M naoh. calculate the concentraion of acetic acid in the vinegar if the intitial volume reading on the burrette was 1.35 ml and the final reading is 37.83ml
The value of 0.134 M was found to correspond to the concentration of the solution.
What is the exact percentage of acetic acid that is present?Titration is a technique of analysis that, as far as we are aware, relies on the volume of the solutions in order to determine the concentration of the substance being tested.
We are aware of that;
Vinegar's total volume is equal to 5 ml plus 25 ml, which equals 30 ml.
0.1098 millimolar is the concentration of sodium hydroxide.
The volume of sodium hydroxide that was utilized was calculated to be 36.48 mL by subtracting 1.35 mL from 37.83 mL.
Applying the calculation method;
CAVA/CVB = NA/VB
CBVBNA is equal to CAVANB.
CA= CBVBNA/VANB
CA = 0.1098 * 36.48 * 1/30 * 1
CA = 0.134 M
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design a concept map that shows the relationships among ionic bond strength physical properties of ionic compounds lattice energy and stability
Answer:
Explanation: I have included a picture of the concept map. Feel free to ask any questions.
Higher lattice energy means that more force is needed to break the ionic solid apart into its individual ions. Ionic bonding hence becomes stronger than lattice energy increases.
What is lattice energy ?The energy that changes when one mole of a crystalline ionic compound is formed from its component ions, which are believed to begin to be in the gaseous state, is known as the lattice energy. It gauges the cohesive forces that hold ionic solids together.
One mole of a solid ionic compound can be formed when gaseous ions react, releasing a particular amount of energy. Lattice energy can also be used to describe the energy required to aid the dissociation of one mole of a solid ionic compound into its component gaseous ions.
Thus, Ionic bonding hence becomes stronger than lattice energy increases.
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I have no idea how to do these
The frequency of a radio wave with an energy of 8.3 x 10⁻²⁴ J is 1.25 x 10¹⁰ Hz.
Energy is directly proportional to the frequency. The relationship between energy and frequency can be given as -
E = hν
where,
E = energy
h = Planck's constant
ν = frequency
Waves carries energy. Therefore, the energy carried by the waves is related to the frequency and their amplitude.
If the frequency is higher, energy will be more for a wave. If wavelength increases, the energy and the frequency gradually decreases.
We know that,
E = 8.3 x 10⁻²⁴ J
h = 6.62 x 10⁻³⁴
We will calculate frequency using the above equation,
E = hν
ν = E
h
ν = 8.3 x 10⁻²⁴
6.62 x 10⁻³⁴
ν = 1.25 x 10¹⁰ Hz
Hence, the frequency of radio wave is 1.25 x 10¹⁰ Hz.
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The compound para-nitrophenol (molar mass = 139 g/mol) reacts with sodium hydroxide in aqueous solution to generate a yellow anion. Because the amount of para-nitrophenol is easily estimated from the intensity of the yellow color that results when excess NaOH is added, reactions that produce para-nitrophenol are commonly used to measure the activity of enzymes, the catalysts in biological systems. What volume of 0.105 M NaOH must be added to 50.0 mL of a solution containing 7.20 × 10−4 g of para-nitrophenol to ensure that formation of the yellow anion is complete?
The volume of the sodium hydroxide solution required is 4.9 * 10^-5 L.
What is the volume required?We know that the reaction between the sodium hydroxide in aqueous solution and para-nitrophenol is a 1:1 reaction. We now have to find the volume of the sodium hydroxide solution that must be added to the solution in order to ensure that formation of the yellow anion is complete.
We should know that the reaction is equimolar so we can write that;
0.105 M * V = 7.20 × 10−4 g/ 139 g/mol
V = 7.20 × 10−4 g/ 139 g/mol/0.105 M
V = 4.9 * 10^-5 L
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What is the final temperature in °C of 680.1 g of water (specific heat
= 4.184 J/g °C) at 24.20°C that absorbed 950.0 J of heat?
Answer:
24.53 °C
Explanation:
To find the final temperature, you need to use the following equation:
Q = mc(T₂ - T₁)
In this equation,
-----> Q = heat (J)
-----> m = mass (g)
-----> c = specific heat (J/g°C)
-----> T₂ = final temperature (°C)
-----> T₁ = initial temperature (°C)
Using the given values, you can rearrange the equation and simplify to find "T₂".
Q = 950.0 J T₂ = ? °C
m = 680.1 g T₁ = 24.20 °C
c = 4.184 J/g°C
Q = mc(T₂ - T₁) <----- Given equation
950.0 J = (680.1 g)(4.184 J/g°C)(T₂ - 24.20°C) <----- Insert values
950.0 J = 2845(T₂ - 24.20°C) <----- Multiply 680.1 and 4.184
0.3339 = T₂ - 24.20°C <----- Divide 950.0 by 2845
24.53 = T₂ <----- Add 24.20 to both sides
Order these events of a chain reaction from first to last.swap_vertA number of atoms undergo fission.swap_vertOne atom undergoes fission.swap_vertA number of neutrons are produced.
This describes a fission chain reaction:
Initially, the reaction starts with the fission of an atom with an unstable nucleus. In fission, neutrons are produced, and they travel through the surrounding medium. Eventually, they meet other atoms and they are captured by their nuclei: the nuclei become unstable and they undergo fission as well.
The order will be: answer
1) One atom undergoes fission.
2) A number of neutrons are produced.
3) Each neutron finds another atom.
4) A number of atoms undergo fission.
I did lab about solubility using sugar, table salt, and baking soda. My results show High solubility: Sugar>salt>baking soda. But i still don't get it why...Why does sugar high solubility than salt? Why does salt have high solubility than baking soda?
Sugar has high solubility than salt and baking soda due to the big size of sugar molecules as compared to the molecules of dissolved salt and baking soda.
Why does sugar have a high solubility?
Sugar has high solubility than salt because the sugar molecules are bigger than the molecules of dissolved salt. This allows more water molecules to surround a single particle of sugar that pulling it into a solution faster as compared to salt and baking soda. Sugar dissolves in water due to high solubility because energy is given when the partially polar sucrose molecules can result in the formation of intermolecular bonds with the polar water molecules. The weak bonds that form between the sugar and the water needed the energy to break the structure of both the pure solute which is sugar and the solvent i.e. water.
So we can conclude that the sugar molecules have large than the molecules of dissolved salt, so that's why Sugar has high solubility than salt and baking soda
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what does it add up to
Answer:
3N H
2 2 (The 2 goes in the spaces for the lower numbers)
Explanation:
what is the full answer with steps
After adding the next amounts of NH, the final solution's pH was 4.98. Strong acid plus weak base equals an acidic pH, which is supported by this.
If you'll note, NH3 and HNO3 have the same volume and concentration, while HNO3 only contains one H.
As a result, you should persuade yourself that these react exactly as they should because their mol quantities are equivalent.
Make use of the following equation to determine pH:
pH = -log [H+]
The pH formula can be used to determine the pH of a chemical solution and how acidic or basic it is: pH equals -log10[H 3 O +]. Anything below 7 is acidic, and everything over 7 is basic. Learn how to calculate the pH of any chemical solution using the procedures listed below.
To Identify pH true meaning:
The concentration of hydrogen ions in a solution is determined by the pH scale. A solution having a lot of hydrogen ions in it is acidic. Normally, the pH scale is displayed from 0 to 14. The solution is more straightforward the larger the number.
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What is the chemical name of the compound Na2CO3? Use the list of polyatomic ions and the periodic table to help you answer.
A.
sodium carbon oxide
B.
sodium carbonate
C.
sodium(II) carbonate
D.
sodium oxalate
Answer:
sodium carbonate
Explanation:
sodium carbonate
An unknown compound is analyzed gravimetrically and found to contain 77.6 ± 0.1 % of bromine. You know the initial compound could be the bromide salt of sodium, potassium or calcium. Determine the molecular formula of the initial unknown salt. Show your work.
I will will name brainliest to whoever answers quickly and correctly
An unknown compound is analyzed gravimetrically and found to contain 77.6 ± 0.1 % of bromine. Molecular formula is NaBr (sodium bromide)
This is further explained below.
What is the Molecular formula?Generally, Here given the 77.6+1-0.1 \%bromine Mass percentage of [tex]$\mathrm{Br}$ in $\mathrm{NaBr}=\frac{79.9}{102.89} \times 100$[/tex]
=0.776 *100
=77.6%
Therefore the mass percentage of Br in NaBr is 77.6 % matched with the given bromine mass percentage 77.6 [tex]\pm[/tex]0.1 %
Mass percentage of
[tex]$$\begin{aligned}\mathrm{Br} \text { in } \mathrm{KBr} &=\frac{79.9}{119} \times 100 \\&=0.671 \times 100 \\&=67.1 \%\end{aligned}$$[/tex]
Mass percentage of Br in CaBr_2[tex]=\frac{159.8}{199.8} \times 100$$=79.9 \%$[/tex]
Therefore, the mass % of B_r in k B r on d CaBr_2 is a hot match with the given mass % $77.6[tex]\pm[/tex] 0.10%
Therefore, the Molecular formula of an unknown salt is NaBr
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What is characteristic of a covalent bond?
Answer:below
Explanation:
Some of the properties of covalent bonds are: Covalent bonding does not result in the formation of new electrons. The bond only pairs them. They are very powerful chemical bonds that exist between atoms.
2) What is the change in enthalpy when 3.400 moles of aluminum react with excess ammonium nitrate(NH4NO3) according to the equation? Is the reaction exothermic or endothermic?2AI + 3NH^4NO^3 →3N^2 + 6 H^2O + Al^2O^3AH = -2030kJ/mol
The given reaction is exothermic, we know igt because of the sign of the change in enthalpy given by the question, which is negative.
Exothermic reactions have negative changes in enthalpy.
The change in enthalpy can be found by multiplying the given amount of moles of aluminium by the given change in enthalpy:
[tex]-\frac{2030kJ}{mol}\cdot3.40mol=-6902kJ[/tex]The change in enthalpy is -6902kJ.
Calculate the pH of 0.15M sodium acetate
Answer:
12 +12 24
Explanation:
explationnnnnn ph 0.15=30
Why is it the principle about the relationship between mass and volume always true of substance, but not always true of mixtures
Answer:
For pure substances, the mass and volume will always be the same or will always change the same way because all substance are the same throughout.
While for mixtures, you can have varying amount of each component therefore mass and volume will not change the same way for substances
Name: _____________________________________________ Date: ________________________
Second Read of “Investigating Landforms on Venus”
Gerya and his team wanted to answer the question What formed the novae on Venus? Their idea was that the higher surface temperature and thinner crust of Venus caused the novae to form.
• Reread the final three paragraphs of the “Investigating Landforms on Venus” article.
• Then, highlight or add annotations to parts of the text that relate to the questions next to the article.
• Using your annotations, answer the questions below.
How were the novae on Venus similar to the landforms in Gerya’s computer model? ________________________________________________________________________
The thing that formed the novae on Venus is As a result of the interaction between mantle diapirs and the lithosphere and radial fracture brought on by the emplacement of novae are believed to have formed.
The parts of the text that relate to the questions are:
"Rock rising up from the underground""Temperature of Venus was hotter than that of earth"Novae on Venus similar to the landforms in Gerya’s computer model as the model's output corresponded to Venusian novae. This supported Gerya's hypothesis that novae may emerge as melted rock was allowed to push up toward the surface due to a thinner crust and higher surface temperature.
What is the name of the Venusian landform being studied?Venus has dome-shaped features called novae. They have cracks radiating from their centers in all directions, making them simple to observe from above. The plural of the word "nova" is "novae."
As a result of the interaction of mantle diapirs with the lithosphere and radial fracture brought on by the emplacement of novae are believed to have formed.
Note that Venus planet is comparable to Earth on the inside and is a tad smaller than Earth. Venus's surface is obscured by dense clouds, so we can't see it from Earth. However, its space missions have revealed that its surface is covered with craters, volcanoes, mountains, and other geological features.
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In an underground gas reserve, a bubble of methane gas (C H4) has a volume of 45.0 m L at 1.60 atm pressure.part A: What volume, in milliliters, will the bubble occupy when it reaches the surface where the atmospheric pressure is 744 m m H g, if there is no change in the temperature and amount of gas?part B: What is the new pressure, in atmospheres, when the volume of the methane gas bubble expands to 125 m L, if there is no change in the temperature and amount of gas?
Answer:
[tex]0.58\text{ atm}[/tex]Explanation:
Here, we want to getthe new pressure
From Boyles' law, we know that the volume of a given mass of gas is inversely proprttional to the pressure at a constant temperature
Mathematically:
[tex]P_1V_1\text{ = P}_2V_2[/tex]where:
P1 is the initial pressure hich is 1.6 atm
P2 is the final pressure which is 744 mmHg (converting to atm by dividing by 760 mmHg, we have the aluea as 744/760 = 0.98 atm
V1 is 45 ml
V2 is ?
[tex]V_2\text{ = }\frac{1.6\times45}{0.98}\text{ = 73.5 mL}[/tex]Now, the gas expanded from 73. mL to 125 mL
The initial pressure woud now be 0.98 atm
Thus, we have the new pressure as:
[tex]\begin{gathered} P_2\text{ = }\frac{73.5\times0.98}{125} \\ \\ P_2\text{ = 0.58 atm} \end{gathered}[/tex]
If someone falls at a rate of 2 kg/s, how long in seconds will it Take someone with a mass of 119 lb To fall Off a hill?
Answer:
27 s.
Explanation:
We have to do the calculations with the right units, so let's convert from 119 lb to kg. Remember that 1 lb equals 0.454 kg. Based on this information we can state a rule of three and the conversion will look like this:
[tex]119\text{ lb}\cdot\frac{0.454\text{ kg}}{1\text{ lb}}=54.0\text{ kg.}[/tex]Now, we have to do a dimensional analysis to obtain the answer. We want to find the time that this person falls off a hill, and time is in seconds, so we have to 'cancel' the mass in kg to obtain seconds and this would be a multiplication. A 2 kg mass falls in one second, this multiplied by the mass of the person is:
[tex]54.0\text{ kg}\cdot\frac{1\text{ s}}{2\text{ kg}}=27\text{ s.}[/tex]The answer would be 27 s.
Macmillan Learning
Consider the mechanism.
step 1:
step 2:
overall:
Which species is an intermediate?
A
AB
AC
B
Which species is a catalyst?
AC
B
AB
A
Considering the mechanism -
Step 1: A + B → AB
Step 2: AB + C → AC + B
Overall: A + C → AC
Here AB is the intermediate and B is a catalyst.
AB is an intermediate of the reaction because it is formed and completely utilized in the reaction mixture by itself.
A catalyst is a type of species which is added to the reaction mixture but it remains unchanged as it do not participate in the overall reaction. A catalyst helps the reaction to form the products at a faster rate.
Intermediate is formed from the reactants which interacts to produce immediately visible products of a chemical reaction, while catalyst results in speeding up of a chemical reaction and it is not consumed in the reaction.
Complete question is -
Macmillan Learning
Consider the mechanism.
Step 1: A + B → AB
Step 2: AB + C → AC + B
Overall: A + C → AC
Which species is an intermediate?
A
AB
AC
B
Which species is a catalyst?
AC
B
AB
A
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If 0.5 moles of solute are dissolved into 25 mL of solvent, what is the molarity of the resulting solution?Given:Find:Equation Used:Answer:
20.0M
Explanations
Given the following parameters;
Moles of solute = 0.5moles
Volume of the solvent = 25mL = 0.025L
Required parameter
Molarity of the resulting solution
The formula for calculating the molarity of the solution is expressed as:
[tex]M=\frac{n}{v}[/tex]n is the moles of solute
v is the volume of solvent
Substitute the given parameters into the formula to have:
[tex]\begin{gathered} M=\frac{0.5\text{moles}}{0.025L} \\ M=20.0M \end{gathered}[/tex]Therefore the molarity of the resulting solution is 20.0M
A system does 571 kJ of work and loses 276 kJ of heat to the surroundings.
What is the change in internal energy, AE, of the system? Note that internal energy is symbolized as AU in some sources
A system does 571 kJ of work and loses 276 kJ of heat to the surroundings. thus, the internal energy change is -847kj .
What is internal energy ?The internal energy, which results from the molecular state of motion of matter, is an energy form that exists in every system. The internal energy is denoted by the letter U, and the measurement unit is the joule (J).
Rising temperature and changes in state or phase from solid to liquid and liquid to gas cause a rise in internal energy. Planetary bodies can be viewed as a fusion of heat engines and heat reservoirs. Internal energy E is stored in the heat reservoirs, and some of it is converted into different kinds of mechanical, electrical, and chemical energies by the heat engines.
Given ,
the work done by the system is 571KJ.
and heat energy loses to the surrounding is 276kj .
Now , according to the 1st law of thermodynamics , the internal energy change is given by ,
ΔU = Q -W = -276KJ - 571KJ = -847kj
Hence the internal energy change is -847kj .
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How many electrons in an atom can have the quantum numbers in n equal 3, L equal 2
Answer:
10 electrons in an atom can have the quantum numbers in n=3 and l=2.
Explanation:
In the principal quantum number n=3, we can have, within the orbital quantum number l=2, a maximum of 10 electrons, because there, electrons can be located in the 3d orbital.
10. 250.0 ml of 0.650 M zinc ll chloride is mixed with 200.0 ml of 0.750 M sodium hydroxide according to the equation: ZnCl2 + 2NaOH —> Zn(OH)2 + 2NaCl
What is the concentration of the sodium ion left in solution?
What is the concentration of the chloride ion left in solution?
What is the concentration of the excess zinc ion left in solution?
Based on the concentration and volume of reactants:
the concentration of Na⁺ ion in solution is 0.333 Mthe concentration of Cl⁻ in solution is 0.722 Mthe concentration of Zn²⁺ left is 0.028 MWhat is the concentration of each of the ions in the solution at the end of the reaction?The concentration of each of the ions in the solution at the end of the reaction is calculated as follows:
Equation of reaction : ZnCl₂ + 2 NaOH —> Zn(OH)₂ + 2 NaCl
moles of ZnCl₂ = 250/1000 * 0.65
moles of ZnCl₂ = 0.1625 moles
Moles of NaOH = 200/1000 * 0.750
moles of NaOH = 0.15 moles
NaOH is the limiting reactant
Moles of Zn(OH)₂ formed = 0.15 / 2
Moles of Zn(OH)₂ formed = 0.075 moles
final volume of solution = 450 ml
the concentration of Na⁺ ion in solution = 0.15/450
concentration of Na⁺ ion = 0.333 M
concentration of Cl⁻ in solution = 0.1625 * 2 / 450
concentration of Cl⁻ = 0.722 M
concentration of Zn²⁺ left = (0.1625 - 0.15)/450
concentration of Zn²⁺ = 0.028 M
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When electrons are lost, the ions formed are Negatively charged?
Group of answer choices
True
False
What is the most abundant element in magma?Question options:OxygenMagnesiumIronSilicon
ANSWER
Oxygen
EXPLANATION
Magma is the molten or semi-molten natural materials from which all igneous rock is formed
Magma is composed of a mixture of molten materials with varying amounts of dissolved gases and small amount of solid materials.
Magma contains 46.6% of oxygen which is more than half of the total dissolved gases
Therefore, the most abundant element in magma is oxygen
During this CHE 113 experiment, you will create calcium oxalate monohydrate from
calcium chloride and potassium oxalate. If 0.444 g of Ca(C₂04) H₂O were produced,
how many grams of potassium oxalate, K₂(C₂O4), was used as a reactant? Assume a
100% yield, which means all of the reactant was converted to product. Report your
answer in grams to 3 decimal places.
It will take 3.07 m long to reach at its maximum height.
The volleyball will reach at the maximum height at 0.673 s after it is served.The Calculating for the height the volleyball will reach before going to downwards. Therefore the volleyball will do have a maximum height of 3.07 m with respect to the ground.
3.78 m Ignoring resistance, the ball will travel upwards until it's velocity is 0 m/s. So we'll first calculate how many seconds that takes.
7.2 m/s / 9.81 m/s^2 = 0.77945s
The distance traveled is given by the formula d = 1/2 AT^2, so substitute the known value for A and T, giving
d = 1/2 A T^2 d = 1/2 9.81 m/s^2 (0.77945 s)^2 d = 4.905 m/s^2 0.607542 s^2 d = 2.979995
m So the volleyball will travel 2.979995 meters straight up from the point upon which it was launched. So we need to add the 0.80 meters initial height.
d = 2.979995 m + 0.8 m = 3.779995
m Rounding to 2 decimal places gives us 3.78 m.
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Please help me with this
Consider this equilibrium4HCl(g) + O2(g) 2H2O(g) + 2Cl2(g)The equilibrium law expression for the balanced chemical equation would be a) 2[H20][Cl2]/ 4[HCI)[02] b) [H20][C|2]/HC1][02]c) [HCl][02] / [H2O][Cl2] d)[HCl]^4[02] / [H20]^2(C12)^2 e) [H20]^2[Cl2]^2/ [HCl]^4[02] [[
Step 1 - Understanding the equilibrium constant
For a chemical reaction:
[tex]aA+bB\rightleftarrows cC+dD[/tex]The equilibrium constant would be:
[tex]K=\frac{\lbrack C\rbrack^c\lbrack D\rbrack^d}{\lbrack A\rbrack^a\lbrack B\rbrack^b}[/tex]We need to be careful because pure liquids and solids do not enter the equilibrium constant.
Step 2 - Finding the equilibrium constant for the given reaction
For this reaction:
[tex]4\text{HCl}_{(g)}+O_{2(g)}\rightleftarrows2H_2O_{(g)}+2Cl_{2(g)}[/tex]We can see that all substances are in the gaseous state. Therefore, all substances will enter the equilibrium constant. The equilibrium constant in this case will be:
[tex]K=\frac{\lbrack C\rbrack^c\lbrack D\rbrack^d}{\lbrack A\rbrack^a\lbrack B\rbrack^b}=\frac{\lbrack H_2O\rbrack^2\lbrack Cl_2\rbrack^2}{\lbrack O_2\rbrack^{}\lbrack HCl\rbrack^4}[/tex]The correct answer is thus alternative e).
