Free Printable Enthalpy and Calorimetry Review

Worksheets

Enthalpy and Calorimetry Review

Total questions: 20

Worksheet time: 1hrs 12mins

Name

Class

Date

If enthalpy(ΔH) is on the reactants side of a chemical reaction, then the reaction is _________.

Endothermic

Exothermic

If enthalpy(ΔH) is on the products side of a chemical reaction, then the reaction is _________.

Endothermic

Exothermic

If an enthalpy (ΔH) value is given outside of a chemical equation and it is a positive value, then the reaction is _______________.

Endothermic

Exothermic

If an enthalpy (ΔH) value is given outside of a chemical equation and it is a negative value, then the reaction is _______________.

Endothermic

Exothermic

What kind of reaction is this?

Endothermic

Exothermic

Cannot be determined

What kind of reaction is shown in graph A on the left?

Endothermic

Exothermic

Cannot be determined

You mix two solutions and the beaker starts to feel warm.

endo

exo

You mix two solids and they get so cold they freeze a drop of water on the lab counter.

endo

exo

What would be the effect on the particles if more heat is supplied to the system?

They would slow down

They would stop moving

They would speed up

There would be no effect

10.

Thermal energy ALWAYS moves from _____ to _____.

solid to liquid

ice to water

hot to cold

solid to gas

11.

If the specific heat of water is 4.18 J/g∙°C, how much heat is required to increase the temperature of 1.2 kg of water from 23 °C to 39 °C? (show your work)

-80,256 J

80.256 J

80,256 J

-80.256 J

12.

What is the specific heat of an unknown substance if 100.0 g of it at 200.0 °C reaches an equilibrium temperature of 27.1 °C when it comes in contact with a calorimeter of water. The water weighs 75. g and had an initial temperature of 20.00 °C? (Specific heat of water is 4.18 J/g°C) (show your work)

0.111 J/g°C

1.29 J/g°C

0.129 J/g°C

22225.85 J

13.

For a skillet, used for cooking, do you want a high or low specific heat

High, so that it will need more energy to heat up

Low, so that it will change temperature quickly

14.

Calorimetry Question:
A piece of metal with a mass of 32.8 g is heated to 100.5°C and dropped into 138.2 g of water at 20.0°C. The final temperature of the system is 30.2°C. What is the specific heat capacity of the metal? (show your work)

2.56 J/g°C

0.391 J/g°C

5.29 J/g°C

3.50 J/g°C

15.

How do you calculate Enthalpy of a reaction?

ΔH = ΔH_products- ΔH_reactants

ΔT = q / mC

ΔG = ΔH -TΔS

E = mc²

16.

Refer to the following question:
2N₂ + 3H₂ --> 2NH₃ + 46 kJ
How much energy would be produced if only 1 mol of nitrogen was reacted?

92 kJ

0.143 kJ

23 kJ

15 kJ

17.

What mass of P₄ must be reacted to produce 5905 kJ of energy?
P₄ + 6Cl₂ --> 4PCl₃ + 2439 kJ

25.43 g

563.0 g

2.421 g

300.0 g

18.

Calculate ΔH when 4.72 g of carbon reacts with excess oxygen, according to the following equation?
C + O₂ → CO₂
ΔH = -393.5 kJ

-154.8 kJ

-95.0 kJ

-66.7 kJ

-199.5 kJ

19.

Which science involves measuring the amount of heat released or absorbed during a chemical reaction?

stoichiometry

calorimetry

photolithography

metrology

20.

What would likely happen if you were to touch the flask in which an exothermic reaction was occurring?

The flask would feel cooler

The flask would feel warmer

The flask would feel the same before and after a reaction

None of the above

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Enthalpy and Calorimetry Review

Total questions: 20

Worksheet time: 1hrs 12mins

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