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Worksheets8th Grade Chemistry Chapter 1 & 2
Total questions: 34
Worksheet time: 17mins
Name
Class
Date
1.
Water drops stay together on wax paper and they don’t break apart easily because:
a)
Water molecules are small
b)
Water molecules are in motion
c)
Water molecules are attracted to each other
d)
Water molecules are wet
2.
If you put food coloring in room temperature water, the coloring spreads throughout the water.The water causes the color to spread mainly because:
a)
Water molecules are warm
b)
Water molecules are in motion
c)
Water is more dense than food coloring
d)
Food coloring molecules are small
3.
Food coloring spreads out faster in hot water than in cold water.This is mainly because:
a)
The water molecules in hot water move more quickly
b)
The molecules in hot water are larger
c)
The food coloring molecules are small
d)
Hot water is less dense
4.
When a thermometer is heated, the red liquid inside the thermometer moves up.This is mainly because:
a)
The red liquid is thin.
b)
The molecules of the liquid move faster and get a little further apart
c)
Hot liquid is lighter
d)
The glass of the thermometer gets hot
5.
When you heat a sample of a solid, the sample gets a little bigger.This is mainly because:
a)
The particles move faster and get a little further apart
b)
Heat helps the particles grow
c)
Heating the sample makes it lighter
d)
Heating helps the particles slide past each other
6.
In the process of conduction...
a)
Energy is transferred from a lower temperature substance to a higher temperature substance
b)
Energy is transferred from a higher temperature substance to a lower temperature substance
c)
The amount of energy is increased
d)
Both substances get hotter
7.
Water molecules attract each other because there is an attraction between
a)
The oxygen atoms from different water molecules
b)
The oxygen of one water molecule and the hydrogen of another
c)
The hydrogen atoms from different water molecules
d)
The nucleus of two water molecules
8.
When water evaporates...
a)
Water molecules separate into one oxygen atom and two individual hydrogen atoms
b)
The motion of water molecules causes them to stay in the liquid
c)
The motion of water molecules causes them to leave the liquid and become a gas
d)
The water increases in mass
9.
Hot water evaporates faster than room temperature water.This is mainly because
a)
Molecules of hot water are lighter
b)
More water molecules move fast enough to break away from other water molecules
c)
Room temperature water has more mass
d)
The molecules in room temperature water are moving faster
10.
The molecules in room temperature water are moving faster
a)
Water vapor changes from a liquid to a gas
b)
One oxygen and two hydrogen atoms join to form a water molecule
c)
Water vapor changes from a gas to a liquid
d)
The water molecules spread further apart
11.
Cooling water vapor makes it condense faster because
a)
Cooling the vapor causes the molecules to get further apart
b)
The molecules slow down and their attractions bring them closer together
c)
Colder temperatures speeds up the molecules
d)
Water vapor is less dense than liquid water
12.
When water freezes, liquid water turns to solid ice mainly because
a)
The water molecules get harder
b)
The molecules move slowly enough that their attractions keep them in fixed positions
c)
All liquid water eventually becomes ice
d)
Ice can float on water
13.
Different liquids have different freezing points mainly because
a)
Freezers are at different temperatures
b)
Some winters are colder than others
c)
The less liquid you use, the faster it freezes
d)
Different molecules have different levels of attraction.
14.
Ice melts to become liquid water mainly because
a)
The water molecules move fast enough to break out of their fixed positions
b)
Water molecules slow down so much that they melt
c)
Water molecules react with oxygen to produce melting
d)
Ice is less dense than water
15.
If you compare ice and liquid water on the molecular level, you could say that
a)
The molecules in liquid water are closer together
b)
The molecules in ice are closer together
c)
The molecules in ice slide past each other
d)
The molecules in liquid water are smaller
16.
The particles of a liquid are attracted to one another, but can’t move past each other.
a)
True
b)
False
17.
An increase in temperature increases molecular motion and increases the distance between atoms and molecules in solids, liquids, and gases.
a)
True
b)
False
18.
The atoms of a solid are very far apart and vibrate in fixed positions.
a)
True
b)
False
19.
Heating a gas completely stops all of its molecular motion.
a)
True
b)
False
20.
Air has mass.
a)
True
b)
False
21.
The molecules of a gas are not very attracted to each other.
a)
True
b)
False
22.
When fast-moving atoms or molecules hit slower-moving atoms or molecules and increase their speed, energy is transferred. The energy that is transferred is called heat.
a)
True
b)
False
23.
Adding energy has no effect on the rate of evaporation.
a)
True
b)
False
24.
Condensation is the process in which molecules of a gas spread very far apart.
a)
True
b)
False
25.
Making water vapor colder increases the rate of condensation.
a)
True
b)
False
26.
Dry ice can change directly from a solid to a gas.
a)
True
b)
False
27.
Chemistry is the study of _____________________.
a)
matter
b)
water
c)
evaporation
d)
chemicals
28.
Energy can be added or removed from a substance through a process called ___________________ .
a)
condensation
b)
conduction
c)
evaporation
d)
deposition
29.
To conduct a valid experiment, __________________ need to be identified and controlled.
a)
energy
b)
conduction
c)
variables
d)
clefables
30.
_____________ is the process that causes a substance to change from a liquid to a solid.
a)
melting
b)
flushing
c)
freezing
d)
sneezing
31.
When carbon dioxide changes to a gas from a solid, this is called ____________________.
a)
sublimation
b)
deposition
c)
a miracle
d)
impossible
32.
When water vapor freezes from a gas into a solid, this is called __________________________.
a)
reverberation
b)
exasperation
c)
deposition
d)
sublimation
33.
____________________ is when a ice molecules speed up and begin moving past each other.
a)
freezing
b)
condensing
c)
melting
d)
melding
34.
When water vapor changes in the air changes to a liquid and sticks to the side of your cup of ice water, this process is called _______________________.
a)
deposition
b)
sublimation
c)
evaporation
d)
condensation
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