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Themochemistry

Total questions: 26

Worksheet time: 1hrs 2mins

Name
Class
Date
1.
Heat flows from _______ to ______ objects
a)
cooler to warmer
b)
warmer to warmer
c)
warmer to cooler
d)
cooler to cooler
2.
Heat is measured in 
a)
joules
b)
grams
c)
degrees celcius
3.
Energy can not be created or destroyed, it can only be transferred refers to the....
a)
law of conservation of energy
b)
law of conservation of mass
c)
life facts
d)
law of conservation of chemistry
4.
The specific heat(c) of copper is 0.39 J/g °C. What is the temperature change(∆t) when 100 Joules of heat(Q) is added to 20 grams?
a)
12.82 °C
b)
24.12°C
c)
351 °C
5.
A(n) _____________ is a device for measuring temperature.
a)
thermometer
b)
barometer
c)
anemometer
d)
psychrometer 
6.
The transfer of thermal energy between objects of different temperatures is called...
a)
temperature
b)
heat
c)
internal energy
d)
none of these
7.
When thermal energy is added to a substance, the substance's particles move:
a)
More rapidly at an increased diestance from each other.
b)
More rapidly with less distance between each other.
c)
More slowly with a greater distance between each other.
d)
More slowly with a reduced distance between each other.
8.
Heat transfer by conduction occurs when...
a)
particles bump into each other
b)
large numbers of atoms move from place to place
c)
atoms give off heat in the form of electromagnetic waves
d)
electromagnetic waves travel from place to place through a vacuum
9.
Heat transfer by convection occurs when...
a)
electrons bump into other electrons
b)
large numbers of atoms move from place to place
c)
atoms give off heat in the form of electromagnetic waves
d)
electromagnetic waves travel from place to place through a vacuum
10.
Heat travels from the sun to the earth by the process of...
a)
conduction
b)
convection
c)
radiation
d)
insulation
11.
The temperature of a glass of cold water will eventually...
a)
Match the temperature of the surrounding environment.
b)
Always be colder than the surrounding environment.
c)
Become warmer than the surrounding environment.
d)
Never change temperature.
12.
Which law of thermodynamics states that absolute zero cannot be reached?
a)
1st
b)
2nd
c)
3rd
13.
H2 + 2 C + N2 + 270.3 kJ --> 2 HCN
Is this reaction endothermic or exothermic?
a)
Endothermic 
b)
Exothermic
14.
A chemical reaction that absorbs heat from the surroundings is said to be __________ and has a __________ ΔH at constant pressure.
a)
endothermic; positive
b)
endothermic; negative
c)
exothermic; negative
d)
exothermic; positive
15.
What kind of graph is this?
a)
endothermic
b)
exothermic
16.
Enthalpy is energy absorbed or relased during a chemical reaction as
a)
light.
b)
heat.
c)
sound.
d)
pressure.
17.

Ice cream melting is an example of an __________ process.

a)

endothermic

b)

exothermic

18.

Sweating is an __________________ process because heat is released.

a)

endothermic

b)

exothermic

19.

What is calorimetry?

a)

process of measuring kinetic and potential energy

b)

process of measuring heat flow of chemical reactions

c)

process of measuring pressure and temperature of a substance

20.

Consider the reaction: 2 H2O + energy --> 2H2 + O2

a)

exothermic because releasing energy

b)

exothermic because absorbing energy

c)

endothermic because absorbing energy

d)

endothermic because releasing energy

21.
The heat required to raise the temperature of a SUBSTANCE by 1∘C
a)
calorie
b)
joule
c)
specific heat
d)
4.184 J
22.

The specific heat of a substance (C), whose units are J/g°C, is defined as

a)

The number of Joules required to raise the temperature of 1 gram of the substance 1 °C.

b)

The change in temperature when you add 1 Joule of energy.

c)

The number of grams created when the substance cools down 1°C.

d)

How hot or cold that specific amount of substance is.

23.

Plants absorb light energy and convert it to __________ energy during photosynthesis.

a)

Electrical

b)

Thermal

c)

Kinetic

d)

Chemical

24.

Water vaporizes

a)

a) increase (+)

b)

b) decrease (-)

25.

The amount of energy that is absorbed or lost by a system as heat during a process at constant pressure

a)

a) enthalpy

b)

b) entropy

c)

c) specific heat

d)

d) energy

26.

Melting, boiling, evaporation, sublimation and cooking are:

a)

a) EXO

b)

b) ENDO

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