CHEMISTRY HIGH SCHOOL

43 A sample of helium gas is in a sealed, rigid container. What occurs as the temperature of the sample is increased?(1) The mass of the sample decreases.(2) The number of moles of gas increases.
(3) The volume of each atom decreases.
(4) The frequency of collisions between atoms increases.

Answers

Answer 1
Answer:

Answer is: (4) The frequency of collisions between atoms increases.

The average kinetic energy of molecules depends on the temperature.

As temperature increases, molecules gain more energy from surrounding and move faster and have more collisions.

Kinetic energy (standard unit is the joule J) depends on speed of the molecule.

Charles' Law (The Temperature-Volume Law) - the volume of a given amount of gas held at constant pressure is directly proportional to the Kelvin temperature:  

V₁/T₁ = V₂/T₂.  

When temperature goes up, the volume also goes up.
Answer 2
Answer: The best answer is (4) The frequency of collisions between atoms increases, for we are providing the atoms with energy.
Hope this helps~

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what is the concentration, in percent (v/v), of a solution containing 50 mL of diethyl ether (C4H10O) in 2.5 L of solution?

Answers

Answer: The v/v in percent of diethyl ether in a solution is 2%.

Explanation:

To calculate the percentage volume by volume of a solute in a solution, we use the formula:

\%(v/v)=\frac{\text{Volume of solute (in mL)}}{\text{Volume of solution (in mL)}}* 100

We are given:

Volume of solute = 50 mL

Volume of solution = 2.5 L = 2500 mL     (Conversion factor: 1 L = 1000 mL)

Putting values in above equation, we get:

\%(v/v)=(50mL)/(2500mL)* 100=2\%

Hence, the v/v in percent of diethyl ether in a solution is 2%.
Volume of solute = 50 mL

Volume of solution = 2.5 L x 1000 = 2500 mL

( V / V ) = ( 50 / 2500 ) x 100

( V/ V) =0.02 x 100 =  2.0 %

hope this helps!

16.H2O (water) and NaCl (salt) are _________ that are in salt water, which is a(n) __________. Water and salt contain the ____________ hydrogen, oxygen, sodium, and chlorine. Compounds; mixture; elements
Mixture; compounds; elements
Element; compounds; mixture
Compound; elements; compounds

12.The number of _____ determines which element it is.

electrons
protons
positrons
neutrons

Answers

#1...Mixture; compounds; elements
#2...Protons 

Which of the following is a producer? A.a crow that consumes a dead animal on the side of a road

B.a fish that eats smaller fish for its food

C.a giraffe that eats the leaves of trees

D.a plant that has insect larvae feeding on its roots

Answers

D. a plant that has insect larvae feeding on its roots. 

what is the best definition of an element? a. an element is a substance that cannot be broken down. b. an element is a positively charged particle. c. an element is a substance only found in stars.

Answers

The correct answer is a

Which of the following is the most electronegative element? a. He
b. I
c. N
d. O
e. C

Answers

none of these; the most electronegative element is fluorine because an atom of fluorine needs an additional electron to join it's outer membrane, so the atom can achieve stability.

a flourine atom on its own is always a negative ion.

Plz can someone help with this I don't understand how the answer is 3000dm3
Thanks

Answers

Combustion of octane is:
C8H18 + 25/2O2 -> 9H2O + 8CO2

You are given 10 moles of octane and you are required to find the volume of octane

10 moles C8H18 (25/2 moles O2/ 1 mole C8H18) = 125 moles O2

V = 125 moles O2 ( 24 dm3 / 1 mole of gas)
V = 3000 dm3
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