Question

1-A solution has a temperature change of 20 K. What is the temperature change in degree Celsius?

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Question 2

Students used two thermometers in Thermo lab. If both thermometers consistently read temperature exactly 1.0 degree higher than the actual temperature, how does this affect the experimental molar heat of neutralization?

A-It has an unknown impact on the molar heat of neutrailization.

B-This will make the molar heat of neutrailization higher

C-Since the temperature differences are used in all caculations, this should not affect the molar heat of neutralization

D-This will make the molar heat of neutrailization lower

Question 3

Specific heat capacity of water is 4.184 J/(g C). What is its molar heat capacity?

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Question 4

50.0 mL of 2.00 mol/L HNO3 solution and 50.0 mL of 1.00 mol/L NaOH solution, both at 20.0 degree Celsius, were mixed in a calorimeter. Calculate the molar heat of neutralization of HNO3 in kJ/mol if:

(1) final temperature was 27.2 degree Celsius;

(2) the mass of the overall solution was 102.0 g;

(3) the heat capacity of the calorimeter was 25.0 J/C;

(4) and assume that the specific heat of solution is the same as water, 4.184 J/(g C);

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Question 5

A solution of X was mixed with a solution of Y to react. Both X and Y were at the same initial temperature. However, after the reaction, the combined solution got much hotter. Which one is correct about this reaction between X and Y?

A-Exothermic with positive enthalpy of reaction

B-Endothermic with negative enthalpy of reaction

C-Endothermic with positive enthalpy of reaction

D-Exothermic with negative enthalpy of reaction

Question 6

The lines observed in H-lamp are parts of Balmer Series. All these lines are due to a transition from various higher n value to a common n. What is this common lower n value for all these lines? (Hint: the information can be found around "Calculations" area on page 8-67)

A- 0

B- 2

C- 1

D- 3

Question 7

Red and purple are two lines of hydrogen lamp. Which one is correct when comparing these two lines? Choose all that apply.

1-The light of red line travels faster than the purple one.

2-Red line has smaller energy than the purple one.

3-Red line has longer wavelengthh than the purple one.

4-Red line has higher frequency than the purple one.

Question 8

Since we can only see visible lines from a hydrogen lamp, hydrogen lamp does not produce any UV light.

True

False

Question 9

Evaporation of water.........

1-is exothermic

2-has positive enthalpy change

3-is endothermic

4-has negative enthalpy change

Question 10

Which of the following transition in a hydrogen atom will end up releasing the highest amount of energy?

A- n = 10 to n = 3

B- n = 1 to n = 2

C- n = 10 to n = 10000

D- n = 3 to n = 2

Answer 1