Calculate the temperature change of copper metal that has a mass of 43.2 g and is allowed to absorb 1,345 J of heat. The specific heat capacity of copper is 0.385 J/°c g.
Answer: 80.9 K
Explanation:
[tex]Q=mc \Delta T\\\\1345=(43.2)(0.385) \Delta T\\\\\Delta T=\frac{1345}{(43.2)(0.385)} \approx \boxed{80.9 \text{ K}}[/tex]
How can you measure the volume of air inside of a balloon?
You could let the air out of the balloon while it is under the water with a container filled with water upside down over it. And measure the water displacement.
A sample of radioactive waste has a half-live of 40 years and an activity level of 4 curies. After how many years will the activity level of this sample be 0. 5 curies?
After 160 years, the activity level of the sample will be 0.5 curies.
What is half-life?Half life of any radioactive waste is the half decay of that product.
The formula is [tex]\dfrac{\lambda }{\lambda_1} = 2^\dfrac{a}{b}[/tex]
Where, λ is 4 cruies
λ1 is 0.5 cruies
b = 40 years
Putting the values in the equation
[tex]\dfrac{4}{0.5} = 2^\dfrac{a}{40}\\\\\\\dfrac{a}{40} = 4\\ = 160 years[/tex]
Thus, the correct option is 160 years.
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31. calculate the amount of energy released as heat by the freezing of 13.3 g of a liquid substance, given that the substance has a molar mass of 82.9 g/mol and a molar enthalpy of fusion of 4.60 kj/mol.
From the calculations, the heat of fusion of the substance is 0.73 kJ
What is is the heat of freezing?The heat of freezing is the energy released when the substance is converted from liquid to solid.
Now we know that the molar mass of the substance is 82.9 g/mol hence the number of moles of the substance is; 13.3 g /82.9 g/mol = 0.16 moles
Now the heat of fusion shall be;
H = 4.60 kj/mol * 0.16 moles
H = 0.73 kJ
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HELP ASAP PLEASE
The primary cause of water pollution is:
Answer:
the aNSWRER TOP UR QUESTION IS THAT I NMEED TO ANSWER THIS SO I DONT HAVE TO WQATCH ADS LOL
Explanation:
DSADSDASDASDASDSDSDSDSDS and i knowq chem is bio chwem is
Suppose that 5-ml containers of helium (He), neon (Ne), and argon (Ar) are at pressures of 1 atm,
2 atm, and 3 atm, respectively. The He and Ne are then added to the container of Ar.
a. What is the partial pressure of He in the container after the three gases are mixed?
b. What is the total pressure in the container after the three gases are mixed?
The total pressure in the container after the three gases are mixed is 6 atm and the partial pressure of He is 1 atm.
What is Dalton's Law of Partial Pressure ?According to Dalton's Law of Partial Pressure , the pressure exerted by a mixture of gas is equal to the sum of the partial pressure of the gases in the mixture.
P(total) = p₁ +p₂+p₃+.....
As the volume of the containers are same and the
n = 1*5/RT for Helium
n = 2*5 /RT for Neon
n= 3*5/RT for Argon
Mole fraction = moles of the element/Total moles
Moles fraction of Helium is
[tex]\rm \dfrac{1*5}{1*5+2*5+3*5}[/tex]
= 1/6
Total Pressure in the container = 1 + 2 +3 = 6 atm
The partial pressure of Helium will be
=Mole fraction * Total pressure
=(1/6)*6 atm
= 1 atm , as the volume is same the temperature is same , the pressure will also be same.
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9. (05.06 mc)
during an experiment, the percent yield of calcium chloride from a reaction was 80.34%. theoretically, the expected amount should have been 115 grams. what was the actual yield
from this reaction?
caco, + hc - cacl + co, + h20 (5 points)
a. 090.1 grams
b. 92.4 grams
c. 109.2 grams
d. 115.3 grams
The actual yield of the experiment given the data from the question is 92.4 g (Option B)
What is percentage yield?This is the ratio of the actual yield to the theoretical yield of a given reaction multiplied by 100
Percentage yield = (Actual / Theoretical) × 100
What is actual yield?This is the amount obtained from the expriment procedures
What is theoretical yield?This is the amount obtained from simple calculations as regarding the experiment.
How to determine the actual yieldPercentage yield = 80.34%Theoretical yield = 115 gActual yield =?Actual yield = percentage yield × theoretical yield
Actual yield = 80.34% × 115
Actual yield = 0.8034 × 115
Actual yield = 92.4 g
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What is the mass number of an isotope with an atomic number of 57 and that has 69 neutrons?
Answer:
mass number=126
Explanation:
57+69=126
What is the mass in grams of each of the following?
a.) 6.02 x 1024 atoms Bi
c.) 6.02 x 1022 atoms He
e.) 6.02 x 10¹5 atoms U
b.) 1.00 x 1024 atoms Mn
d.) 6.02 x 10¹5 atoms N
Answer:
a. 208g Bi
c. 0.0400g He
e. 2.38g U
b. 9.12g Mn
d. 1.40g N
Explanation:
I apologize in advance if any are incorrect. Hopefully this helps.
Is industry pool or flux
Answer:
What is the difference between pools and fluxes?
Image result for Is industry pool or flux
Fluxes describe the movement of energy and matter between different pools. When you pour a glass of juice for yourself, the juice bottle and the glass are both “pools” for the apple juice. The act of pouring it from the bottle to the glass is the flux
Explanation:
Including soluble fiber into your diet can __________.
A. digest amino acids
B. digest cellulose
C. raise cholesterol levels
D. lower cholesterol levels
Answer:
The answer is D.
Explanation:
Including soluble fiber into your diet can lower cholesterol levels.
What is the percentage by volume of 30.0 mL ethanol (C2H6O) dissolved in 150.0 mL water (H2O)?
16.7 %
20 %
83.3 %
15 %
Answer: 16.7 %
Explanation:
[tex]\frac{30.0}{150.0+30.0}=\boxed{16.7\%}[/tex]
Sample Response: Forces are either positive or negative vectors, depending on the direction in which the force is acting. The net force is the sum of all of the forces acting on an object. If the children pull on the toy with the same force in opposite directions, the forces will be perfectly balanced and cancel out, leaving a net force of zero.
What did you include in your response? Check all that apply.
Forces are vectors.
Forces can be positive or negative.
The forces exerted by the children are in balance.
The net force is the sum of all of the forces that canceled out to zero.
The net force is the sum of all of the forces that cancelled out to zero. Hence, option D is correct.
What is force?The pushes or pulls on an object with mass causes it to change its velocity.
The net force is the vector sum of all forces acting on an object. Force is a vector quantity.
Two forces of equal magnitude when acting on an object in opposite directions will cancel out each other.
As a result net force is equal to 0. The word net here shows the total force acting on the object.
Hence, option D is correct.
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What is force?
The pushes or pulls on an object with mass causes it to change its velocity.The net force is the vector sum of all forces acting on an object. Force is a vector quantity. Two forces of equal magnitude when acting on an object in opposite directions will cancel out each other. As a result net force is equal to 0. The word net here shows the total force acting on the object.Hence, option D is correct.
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Which of the following lists electromagnetic radiations from lowest to highest energy?
Your answer:
radio waves, microwaves, ultraviolet radiation, visible light
microwaves, radio waves, visible light, X-rays
radio waves, infrared radiation, visible light, ultraviolet radiation
gamma radiation, infrared radiation, visible light, X-rays
Answer:
Highest wavelength : radio waves
So lowest energy: radio waves
Hence order is:
radio waves < microwaves < IR waves < visible light < ultraviolet radiation < X-rays < gamma rays
How many moles of Unknown weak acid (HA) in a 100L solution are required to produce a solution with PH =2 ? Ka of the Unknown weak acid (HA)=5x10⁻³
a. 3x10⁻³
b. 0.3x10⁻³
c. 3
d. 0.3
The moles of unknown weak acid (HA) in a 100L solution are required to produce a solution with pH 2 is 0.002 moles.
What is the equation of the acid dissociation constant, Ka?The acid dissociation constant of an acid is given by the formula below:
[tex]K_a= \frac{[A^{-}][H_3O^{-}]}{[HA]}[/tex]
Where
Ka = 5x10⁻³ pH = 2[H3O+] = 10^-2Volume of solution = 100 mL or 0.1 LSince, the Ka is given at equilibrium concentrations, [H3O+] = [A-]
[A-] = 10^-2
Making [HA] subject of the formula:
[tex][HA]= \frac{[10^{-2}][10^{-2}]}{5 \times 10^{ - 3} } = 0.02[/tex]
Moles of acid = 0.1 × 0.02 = 0.002 moles
Therefore, the moles of unknown weak acid (HA) in a 100L solution are required to produce a solution with pH 2 is 0.002 moles.
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There are 75.0 g of glucose (molar mass = 180 g/mol) dissolved in 250 mL of solution. What is the molarity of this solution?
A. 0.416 M
B. 1.70 M
C. 2.13 M
D. 3.31 M
Answer:
5.6 m which is molarith this solution
The vapour pressure of water 12.3kPa at 300K. Calculate the vapour pressure of 1 molal solution of a non-volatile solute in it.
Answer:
ywhehehehehdgdudcdudcd uy dshdcvv
Explanation:
bdbdkzkzjzdkdkzdvdisisksjskakskskzbx vxydcdudschahahbshshs
The pressure of x ml of a gas was increased from 2 atm to 4 atm at constant temperture. what will be the new volume?
The new volume of the gas given the data from the question is 1/2X mL
Data obtained from the question
Initial volume (V₁) = X mL
Initial pressure (P₁) = 2 atm
New pressure (P₂) = 4 atm
New Volume (V₂) = ?
How to determine the new volume
The new volume of the gas can be obtained by using the Boyles’ law equation as illustrated below:
P₁V₁ = P₂V₂
2 × X = 4 × V₂
2X = 4V₂
Divide both side by 4
V₂= 2X / 4
V₂ = 1/2X mL
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A gas at STP is heated to 35 degrees
C. What is the new pressure of the gas?
A gas at STP is heated to 35 degree C. The new pressure will be 2.41 atm.
What is Gay-Lussac law?The pressure of the mass of the gas is directly proportional; to the temperature of the gas.
[tex]\dfrac{P_1 }{T_1} =\dfrac{P_2}{T_2}[/tex]
Converting the temperature into kelvin
The initial temperature = 35 °C = 35 + 273 K= 308 K
The final temperature = 50 °C =50 + 273 K = 323 K
Initial pressure = 2.3 atm
Final pressure ?
Putting the values in the equation
[tex]\dfrac{P_1 }{T_1} =\dfrac{P_2}{T_2}\\\\\\{P_2 = \dfrac{P_1 \times T_2}{T_1} \\\\\\\\\\{P_2 = \dfrac{2.3 \times 323 }{308} = 2.41 atm.[/tex]
Thus, the new pressure will be 2.41 atm.
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right 9 in a equation
Answer:
x+y = 12
Explanation:
shfb gfgjj ghjj dvgg ggggg ghggs ufac t g dgyyh
According to the postulates of kinetic molecular theory, which statement describes the movement of the particles of a liquid?
According to the postulates of kinetic molecular theory, the particles of a liquid are close together and are in constant random motion.
What is the Kinetic theory of matter?The Kinetic theory of matter states that all forms of matter are made up of tiny particles which possess kinetic energy and are in constant state of motion.
The strength of the forces keeping the particles together determines the state in which that substance exists in.
For liquids, the intermolecular forces of attraction between between the molecules are not very strong, and as such, the particles of a liquid are in constant state of random motion.
Therefore, according to the postulates of kinetic molecular theory, the particles of a liquid are close together and are in constant random motion.
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how many grans of NaoH Are needed to neutralize grans of H2So4
Answer :]
to convert from g NaOH to mol NaOH. = 1.48 g NaOH are needed to neutralize the acid.
Generally, what is the effect of increased temperature on the rate of dissolution of a solid solute?
Answer:
Increases
Explanation:
The general effect we see as temperature increases is that rate of dissolution of a solid solute increases,
Therefore, we can say that :
Temperature ∝ Rate of dissolution
A wave is created by causing vibrations in particles of matter. Which
statement about the wave is true?
The wave which is created by causing vibrations in particles of matter is a mechanical wave.
What is a wave?A wave is a disturbance in a medium which transmits transmits energy from one point to another without a permanent displacement of the particles of the medium.
Types of waves include:
electromagnetic wavesmechanical wavesMechanical waves are waves which are produced as a result of the vibrations of the particles of the medium.
Therefore, the wave which is created by causing vibrations in particles of matter is a mechanical wave.
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A sample of helium gas has a volume of 6.50l at a pressure of 845 mmhg and a temperature of 25oc. what is the pressure of the gas in atm when the volume and temperature of the gas sample are changed to 1850 ml and 325 k
Answer:
4.25atm
Explanation:
[tex]\frac{P1V1}{T1}\\[/tex]=[tex]\frac{P2V2}{T2}[/tex]
where ,
p1 =845/760=1.11atm
v1=6.50l
t1=25c +273k=298k
p2=?
v2=1850/1000=1.85l
t2=325k
so answer is 4.25 atm
During dehydration synthesis, an enzyme removes a ____________ functional group from the monomers of one organic molecule and a hydrogen from another monomer, linking monomers together to form a ____________ . This chemical reaction also forms ____________ .
Linking monomers together to form a polymer .This chemical reaction also forms water molecules.
What is Polymerization?This is a type of reaction which involves the linking of two or more monomers to form a polymer.
Dehydration reaction forms water molecules as part of the product thereby making it the most appropriate choice.
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At what temperature would 0.46 moles of a gas occupy 13.3 L if the pressure is 734 mm Hg?
Answer: 341.6k
Explanation:
R= 0.0821
n= 0.46moles
v= 13.3L
p= 734mmhg = 734/760 = 0.97
[tex]T = \frac{p*v}{n*R}[/tex]
[tex]T = \frac{0.97*13.3}{0.46*0.0821}[/tex]
T= 341.6k
Answer:
10100101
Explanation:
this is for the other person alt.
How to draw ethyl pentanoate?
how do you treat a sulfuric acid burn with sodium hydroxide
Match the following terms:
Answer:
See below ~
Explanation:
A to B
⇒ Solid Phase
==========================================================
B to C
⇒ Melting
==========================================================
C to D
⇒ Liquid Phase
==========================================================
D to E
⇒ Vaporizing
============================================================
E to F and beyond
⇒ Gas Phase