7a Practice Name ____________________________________ Number ________ score _______/4
Question
Heat involves the transfer of energy between two objects
that are at different temperatures. When a metal object is
first heated, then submerged in cooler water, the water
will __________ in temperature and the metal will
__________ in temperature.
a) decrease; remain the same
b) increase; remain the same
c) increase; decrease
d) decrease; decrease
Justification
7a Quiz Name ____________________________________ Number ________ score _______/4
Question
1. The random molecular motion of a substance is lowest
when the substance is
a. Condensed
b. A liquid
c. Frozen
d. A gas
2. Rank the following from highest to lowest molecular
velocity.
a. Liquid > gas > solid
b. Solid > Liquid > Gas
c. Gas > Solid > Liquid
d. Gas > Liquid > Solid
3. Heat involves the transfer of energy between two objects
that are at different temperatures. When a metal object is
first heated, then submerged in cooler water, the water will
__________ in temperature and the metal will __________
in temperature.
e) decrease; remain the same
f) increase; remain the same
g) increase; decrease
h) decrease; decrease
4. Four beakers have the same volume of water at a
temperature of 25 degrees Celsius. Four copper blocks,
each having a different temperature, are placed in the
beakers as shown below:
100oC
Beaker 1
10oC
Beaker 2
24oC
Beaker 3
25oC
Beaker 4
In which beaker will heat flow from the block to the water?
a)
b)
c)
d)
1
2
3
4
Justification
7b Practice Name ____________________________________ Number ________ score _______/4
Question
Which describes an endothermic process?
a) an ice cube melting in a glass of warm soda
b) your body shivering on a cold morning
c) nuclear fusion reaction in the sun
d) a candle burning
Justification
7b Quiz Name ____________________________________ Number ________ score _______/4
Question
1. When barium hydroxide [Ba(OH)2] is reacted
with ammonium chloride (NH4Cl), the
following reaction occurs:
Ba(OH)2 + 2NH4Cl + energy  2NH3 + 2H2O + BaCl2
This reaction is
a) exothermic, because energy is produced.
b) exothermic, because energy is absorbed.
c) endothermic, because energy is produced.
d) endothermic, because energy is absorbed.
2. A solid is dissolved in a beaker of water. Which
observation suggests that the process is
endothermic?
a) The solution gives off a gas.
b) The solution changes color.
c) The temperature of the solution decreases.
d) The temperature of the solution increases.
3. Which process involves the absorption of
energy?
a. A rain changing into ice
b. B rain changing into snow
c. C ice crystals changing into rain
d. D water vapor changing into rain
4. Which describes an endothermic process?
a) an ice cube melting in a glass of warm soda
b) your body shivering on a cold morning
c) nuclear fusion reaction in the sun
d) a candle burning
Justification
7b Quiz Name ____________________________________ Number ________ score _______/4
Question
1. When barium hydroxide [Ba(OH)2] is reacted
with ammonium chloride (NH4Cl), the
following reaction occurs:
Ba(OH)2 + 2NH4Cl + energy  2NH3 + 2H2O + BaCl2
This reaction is
a) exothermic, because energy is produced.
b) exothermic, because energy is absorbed.
c) endothermic, because energy is produced.
d) endothermic, because energy is absorbed.
2. A solid is dissolved in a beaker of water. Which
observation suggests that the process is
endothermic?
e) The solution gives off a gas.
f) The solution changes color.
g) The temperature of the solution decreases.
h) The temperature of the solution increases.
3. The graph below represents what type of
chemical reaction?
a. endergonic
b. exothermic
c. endothermic
d. No reactions
4. Which describes an endothermic process?
a) an ice cube melting in a glass of warm soda
b) your body shivering on a cold morning
c) nuclear fusion reaction in the sun
d) a candle burning
Justification
7c Practice Name ____________________________________ Number ________ score _______/4
Question
1. Which process involves the absorption of energy?
a. rain changing into ice
b. rain changing into snow
c. ice crystals changing into rain
d. water vapor changing into rain
2. Water at room temperature (25oC) is placed in a freezer with an
ambient temperature of -15oC. In this environment, the liquid
water freezes and becomes ice. The process of freezing water
is:
a) endothermic because heat flows from the water to the freezer
b) endothermic because heat flows from the freezer to the water
c) exothermic because heat flows from the water to the freezer
d) exothermic because heat flows from the freezer to the water
Justification
7c Quiz Name ____________________________________ Number ________ score _______/4
Question
1. Which phase change is exothermic?
a. Melting
b. Freezing
c. vaporization
d. Evaporating
1. Which process involves the absorption of energy?
a. rain changing into ice
b. rain changing into snow
c. ice crystals changing into rain
d. water vapor changing into rain
2. When Amanda leaves the swimming pool, she
feels cold because of her wet skin. What is
causing her to feel cold?
a. Water changing from liquid to vapor
releases heat to her body.
b. Water changing from vapor to liquid
releases heat to her body.
c. Water changing from liquid to vapor
absorbs heat from her body.
d. Water changing from vapor to liquid
absorbs heat from her body.
Justification
7d Practice Name ____________________________________ Number ________ score _______/4
Lab the sections of solid, liquid, gas, condensation, vaporization, freezing and melting in each of the
graphs below. Also indicate the direction in which endothermic and exothermic processes are occurring.
Makeup 7d exam Name ____________________________________ Number ________ score _______/4
1.
(7A) Label Each of the following letters. Draw and label arrows for EXOTHERMIC
and ENDOTHERMIC
processes.
A:
B:
C:
D:
E:
The table below shows the specific heat for different states of water:
Substance
Specific Heat J/g degrees C
Ice
2.1
Water
4.2
Water Vapor (Steam)
1.9
A 5.0 g sample of ice was heated from -20.0 degrees C to 0 degrees C and remained solid. How much heat did
the ice absorb? (SHOW WORK)
a) 210 J
b) 420 J
c) 1700 J
d) 1900 J
The heat of vaporization of water is 2260 J/g. A sample of water was vaporized by absorbing 525 Joules of
energy. What was the mass of the water sample? (SHOW WORK and Explain why you use each equation)
a) 0.23 g
b) 4.30 g
c) 283,500 g
d) 1,190,000 g