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.
What is the balanced chemical equation for the reaction used to calculate ΔH∘f of BaCO3(s) ?
The balanced equation that can be used to fond the heat of formation is;
[tex]Ba(s) + C(s) + \frac{3}{2}O_{2} (g) ----- > BaCO_{3} (s)[/tex]
What is the heat of formation?The heat of formation is defined as the heat that is evolved or absorbed when a substance is formed from its component elements under standard conditions. Note that the components of the equations must be the substances that are in standard form.
In this case, we are trying to see the balanced chemical equation for the reaction used to calculate ΔH∘f of BaCO3(s). We have to know that is equation must have to involved the barium, carbon and oxygen atoms as the barium carbonate compound is formed.
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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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What step comes after the observation stage in the scientific method?
• asking questions about the observation
• interpreting data
• writing a theory
• publishing your results
The step comes after the observation stage in the scientific method
asking questions about the observation.What is scientific method?The scientific method is the process of objectively establishing facts through testing and experimentation. The basic process involves making an observation, formulating a hypothesis, making a prediction, conducting an experiment and finally analysing the results.
7 steps of the scientific methods are
Make an observation. Ask a question. Form a hypothesis or testable explanation. Make a prediction based on a hypothesis. Test prediction. Iterate: Use the results to make new hypotheses or predictions.To learn more about scientific method, refer;
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If you have a gas with a volume of 45 L, pressure of 1.01 atm, and a temperature of 25 degrees Celsius what is the amount of gas you have? Answer with 3 significant figures and no units.
Answer:
Explanation:
Comment
You have to look around for the best R to use. The problem is that R has different values depending on what the units of the givens are. In this case you have
Givens
V = 45 L
P = 1.01 atmospheres
T = 25 degrees = 25oC + 273 kelvin = 298 degrees kelvin
R = 0.08206 for those givens.
Equation
PV = n * R * T
Solve
1.01 * 45 = n * 0.08206 * 278
n = (1.01 * 45) / (0.08206*278)
n = 1.99
What is the pressure of an 8.5 L cylinder filled with 23.5 grams of nitrogen gas at a temperature of 298 K?
To solve this question, we need to use the Clapeyron equation. The Clapeyron equation is a mathematical expression that relates quantities such as pressure (P), volume (V), temperature (T) and the number of particles (n) that make up an ideal gas.
The formula is PV = nRT.
First, let's transform 23.5 grams fo nitrogen gas (N2) into moles using its molar mass and the following formula: moles = mass/molar mass
molar mass of N2 = 28 g/mol
moles = 23.5/28 = 0.839 moles
Now let's use the formula PV = nRT
where:
P = ???
V = 8.5 L
n = 0.839 moles
R = 0.082 atm.L/K.mol
T = 298 K
P x 8.5 = 0.839 x 0.082 x 298
P = 20.51/8.5
P = 2.41 atm
Answer: the pressure is 2.41 atm
What happens in a single-replacement reaction?
A single replacement reaction, also known as a single displacement reaction, occurs when one element in a molecule is swapped out for another. Starting ingredients are always pure elements combined with an aqueous compound, such as pure hydrogen gas or zinc metal.
Two pure elements and one aqueous compound or solution are required for all single-replacement reactions. The A and C in the aforementioned reaction would be pure elements. Zn + 2HCl > ZnCl2 + H2 is an example of a single-replacement reaction in detail.
You must make use of a "Activity Series" table to ascertain whether a certain single replacement will take place. A single displacement reaction will take place if the metal or halogen is above the element it would replace according to the activity series.
In a compound, one element takes the place of another to create a new material. The number of reactants and products in a single replacement reaction is equal.
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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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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
The mole fraction of iron(II) bromide, FeBr2, in an aqueous solution is 6.15×10-2. The percent by mass of iron(II) bromide in the solution is what %?
First, let's put the info into symbols:
[tex]\begin{gathered} X_{FeBr_2}=\text{ 6.15*10}^{-2} \\ \end{gathered}[/tex]As the mole fractions have to add up to 1, we can calculate the water mole fraction, substracting:
[tex]X_{H_2O}=\text{ 1-6.15*10}^{-2}=0.9385[/tex]If we make the supposition that we have 1 mole of the solution, we would have the next quantities of each substance:
[tex]6.15*10^{-2}\text{ moles of FeBr}_2\text{ and 0.9385 moles of water. }[/tex]Now, we can convert these moles into mass through the molecular weight of each substance:
[tex]\begin{gathered} M.W\text{ of water: 2*1+16=18 g/mole} \\ M.W.\text{ of iron \lparen II\rparen bromide: 56+80*2=216 g/mole} \\ \\ 6.15*10^{-2}moles\text{ FeBr}_2*\frac{216\text{ g}}{1\text{ mole}}=\text{ 13.284 g FeBr}_2 \\ \\ 0.9385\text{ moles H}_2O\text{ * }\frac{18\text{ g}}{1\text{ mole}}=16.893\text{ g H}_2O \end{gathered}[/tex]Now, we can calculate the mass percentage, because we have the mass of the substrate and the mass of the solution (the addition of water and iron (II) bromide):
[tex]\%\text{ m/m FeBr}_2=\frac{13.284\text{ g}}{13.284g+16.893g}*100=44.020\text{ \% m/m}[/tex]The answer is that the %m/m of iron bromide in the solution is 44.020%
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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the blank the acceleration since there is blank proportionaly between them
A student measured out 0.333 moles of theobromine, CyH3N402 (MM = 180.8/mol) the
primary alkaloid found in chocolate. How many molecules of theobromide did the
student measure
Answer
2.0 x 10²³ molecules.
Explanation
Given:
The number of moles of theobromide measured out = 0.333 moles.
MM of theobromide = 180.8 g/mol
What to find:
The number of molecules of theobromide the student measured.
To go from moles to molecules, multiply the number of moles by Avogadro's number.
The Avogadro's number = 6.02 x 10²³
1 mole of theobromide contains 6.02 x 10²³ molecules.
So, 0.333 moles of theobromide measured out will have (0.333 x 6.02 x 10²³) = 2.0 x 10²³ molecules.
Which of the following are gamma rays NOT used for?`A. None of theseB. Industrial imagingC. Medical imagingD. Sterilization
Answer
A. None of these
Explanation
Gamma rays are ionizing electromagnetic radiation, obtained by the decay of an atomic nucleus. Gamma rays are more penetrating, in the matter, and can damage living cells to a great extent. Gamma rays are used in medicine (radiotherapy), industry (sterilization and disinfection), and the nuclear industry.
Thus, gamma rays are used for all the options given in B - D. So the correct answer is option A. None of these
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.
1. SEP Develop Models Use the space to create a model of the investigative
phenomenon. As you develop your model, consider the following:
• Why are fireworks different colors? What features of the atomic structure
might be part of the reasoning? How is light made or moved?
• Your model does not need to include every feature of the phenomenon.
Instead, focus on the features that you think are important for explaining
how or why the phenomenon occurs.
•
Use labels to identify and differentiate the components of your model.
.
Choose an appropriate scale for the model. If needed, label any specific
dimensions or measurements.
An atom is a complicated configuration of negatively charged electrons grouped around a positively charged nucleus in certain shells. Protons and neutrons make up the majority of the atom's mass in this nucleus (except for common hydrogen which has only one proton).
Fireworks' vibrant colors come from mineral components. Bright greens are produced by barium, deep reds by strontium, blues by copper, and yellow by sodium.
What is Atomic structure ?For instance, the nucleus of hydrogen is made up of a positively charged proton and a negatively charged electron. On the periodic table of elements, the atomic structure is also depicted.Protons, electrons, and neutrons are the three fundamental particles that make up an atom. The protons (positively charged particles) and neutrons are found in the nucleus (center) of an atom (no charge). The electrons are located in the outermost portions of the atom, which are known as the electron shells (negatively charged).Types ;
The atomic theory of John Dalton.model for plum pudding.Atomic model proposed by Rutherford.Atomic model proposed by Bohr.Atomic Model Based on Quantum Mechanics and the Electron Cloud.The quantum mechanical atomic model is basic description:To know more about Atom please click here ; https://brainly.com/question/6258301
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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
The Radium Girls experienced devastating health outcomes from ingesting radium from their paint brushes.
We know that both radium and calcium will concentrate in our bones. Why might this be, and why might
radium be damaging to our bones while calcium is not?
Choose ALL correct answers.
A Radium and calcium will both form 2+ cations but radium is more reactive and more unstable.
B Radium and calcium will both form 2+ anions but radium is more reactive and more unstable.
C Calcium and radium are period 2 elements. Both will concentrate in our bones due to their similar
chemical properties.
D Calcium and radium are group 2 elements. Both will concentrate in our bones due to their similar
chemical properties.
Both radium and calcium will concentrate on our bones. Suitable statements are A and D Calcium and radium are group 2 elements. Both will concentrate on our bones due to their similar chemical properties.
Radium and calcium are alkaline earth metals, meaning they proportion a number of equal chemical homes due to each in their atom's outer shells containing two valence electrons. although radium is radioactive and calcium isn't, the frame can't distinguish among these factors that appear to act in an identical manner.
The paint contained radium. even as radium is only faintly radioactive, the women were informed to lick their paintbrushes to present the finer points. This led to complaints that had been influential in the early levels of workplace safety law within the U.S.
Young ladies painted face dials with radioactive fabric. Unaware that the paint turned into dangerous, they would locate the brush tip on their lips to acquire a nice point. After being laid low with radium poisoning, numerous younger girls sued their employers and brought national attention to the safety of people.
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[tex] \huge \color{basic}{ \boxed{ \tt{✐Answer:}}}[/tex]
The Radium Girls experienced devastating health outcomes from ingesting radium from their paint brushes. We know that both radium and calcium will concentrate in our bones. Why might this be, and why might radium be damaging to our bones while calcium is not?
Choose ALL correct answers.
☑︎ A. Radium and calcium will both form 2+ cations but radium is more reactive and more unstable.
☐ B. Radium and calcium will both form 2+ anions but radium is more reactive and more unstable.
☐ C. Calcium and radium are period 2 elements. Both will concentrate in our bones due to their similar chemical properties.
☐ D. Calcium and radium are group 2 elements. Both will concentrate in our bones due to their similar chemical properties.
________________________________
The correct answer is letter [tex] \large \bold{A}[/tex]
True or False *hint 3 Trues and only 1 false*
True or false, Meiosis starts with half the number of chromosomes as Mitosis.
True or false, the genetic offspring are exactly like the parent call.
True or false, there are 23 chromosomes from each parent cell.
True or false, meiosis goes through 2 stages of division, meiosis i and ii.
Meiosis starts with half the number of chromosomes as Mitosis = True
The genetic offspring are exactly like the parent call = False
There are 23 chromosomes from each parent cell = True
Meiosis goes through 2 stages of division, meiosis i and ii = True
---------------------------------------------------
Hope this helps!
Have a great day and God bless! :)
How many molecules are in 82.93 moles of N205?
Answer:
2.41 molecules.
Explanation:
hope this helps!
How does oxygen inhaled through the lungs enter the bloodstream. A. Through the nerves. B. Through the alveoli. C. Through the atrium. D. Through the epiglottis
Through the alveoli, oxygen inhaled through the lungs enter the bloodstream.
What is the definition of the respiratory system?The respiratory system is a biological system consisting of certain organs and structures used for gas exchange in animals and plants. The anatomy and physiology that cause it to vary greatly depending on the size of the organism, the environment in which it lives, and its evolutionary history. In terrestrial animals, the respiratory surface is inserted into the mucous membranes of the lungs. Gas exchange in the lungs takes place in millions of tiny air sacs; in mammals and reptiles, they are called alveoli and in birds atrium. These microscopic air sacs have a very rich circulation, which brings the air into close contact with the blood.
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The unit for volume in W/V% questions is litres when mass is in grams. True False
The unit for volume in W/V% when mass is in grams is mililiters, g/mL, therefore this statement is false
A 0.032 mole sample of gas is contained in a 1 L container at 23 degrees Celsius. What is the pressure of the gas?
Ideal gas law is valid only for ideal gas not for vanderwaal gas. The pressure of 0.032 mole sample of gas is contained in a 1 L container at 23 degrees Celsius is 0.77atm.
What is ideal gas equation?
Ideal gas equation is the mathematical expression that relates pressure volume and temperature.
Mathematically,
PV=nRT
where,
P = pressure=?
V= volume=1 L
n =number of moles= 0.032 mol
T =temperature = 23°C=296K
R = Gas constant = 0.0821 L.atm/K.mol
P × 1 L = 0.032mole× 0.0821 L.atm/K.mol × 296K
P =0.77atm
Therefore, the pressure of 0.032 mole sample of gas is contained in a 1 L container at 23 degrees Celsius is 0.77atm.
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A solution of 2.95 g of solute dissolved in 25.0 mL of H2O at 25°C has a boiling point of 100.300°C. What is the molar mass of the solute if it is a nonvolatile nonelectrolyte and the solution behaves ideally (d of H2O at 25°C = 0.997 g/mL)?
To solve this we must know the concept behind the phenomenon of elevation in boiling point when a non volatile solute is added to any solvent, the molar mass of solute is 115.40g
What is elevation in boiling point ?Whenever a non volatile solute is added to a solvent then the boiling point of solvent increases
Mass of solution = volume× density
= 25.0 mL×0.997 g/mL
=24.925g
= 0.024Kg
ΔT= Kb× molality
100.300-100=0.512×m
0.58=m
0.58×0.024=mole
0.013=mole
mass =given mass÷ mole
= 1.50÷0.013
= 115.40g
Thus the molar mass of solute is 115.40g
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is chalk made of calcium carbonate, CaCO3. explain which atoms are needed, and in what ratios, to make chalk. are the elements that make up chalk metals or nonmetal? what would you predict would happen when this substance is placed in water
Answer: calcium is metal and carbon and oxygen is non metal. If you place the chalk in the water there won’t be any chemical reaction
Explanation: Hope my answer is helpful
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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If 2 L of gas has a pressure of 6 atm at 27⁰C. what is the temperature in Celsius if the pressure is decreased to 2.5 atm and the volume is changed to 0.66L?
3.7 degree celsius
Explanations:According to ideal gas equation;
[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]where:
• P1 and P2 are the initial and final pressure
,• V1 and V2 are the initial and new volume
,• T1 and T2 are the initial and final temperature
Given the following parameters
[tex]\begin{gathered} P_1=6atm \\ V_1=2L \\ T_1=27^0C \\ P_2=2.5atm \\ V_2=0.66L \end{gathered}[/tex]Required
Final temperature T2
Substitute
[tex]\begin{gathered} T_2=\frac{P_2V_2T_1}{P_1V_1} \\ T_2=\frac{2.5\times0.66\times27}{6\times2} \\ T_2=\frac{44.55}{12} \\ T_2\approx3.7^0C \end{gathered}[/tex]Therefore the new temperature in Celsius is 3.7 degree celsius
Need some help on this please!
The energy levels from lowest to highest energy is 1s, 2s, 2p, 3s, 3p, 4s, 3d and is therefore denoted as option A.
What is Energy level?This is referred to as a fixed distance of electrons from the nucleus of an atom and is the energy an electron has when it is above ground state and starts with the 1s.
The appropriate energy level from the least to the highest is in the order of 1s, 2s, 2p, 3s, 3p, 4s, 3d and they have the distinct number of electrons they contain thereby making option A the most appropriate choice.
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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
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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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.
