WorksheetsUnit 8 Changes in Matter
Total questions: 18
Worksheet time: 31mins
Name
Class
Date
1.
Which of the following is a physical change?
a)
burning
b)
evaporating
c)
rusting
d)
tarnishing
2.
What is a mixture?
a)
a combination of substances that give off gas
b)
any type of matter that can change its shape or color
c)
any type of matter that evaporates when heat energy is added to it
d)
a combination of two or more substances that keep their identities
3.
Which of the following is a solution?
a)
salt water
b)
sand and water
c)
muddy water
d)
pepper and water
4.
All matter has certain chemical properties. What is a chemical property?
a)
any property related to color and shape
b)
any property related to size and weight
c)
any property that causes matter to stay the same
d)
any property that describes how a substance interacts with other substances
5.
Matter can undergo both chemical and physical changes. Which of the following is a physical change?
a)
rusting
b)
tarnishing
c)
making a solution
d)
reacting with an acid
6.
Toni mixes chocolate power in her milk. She notices that the chocolate powder dissolves. Based on her observations, what can Toni conclude?
a)
The chocolate power is a solute.
b)
The chocolate powder is a solvent.
c)
The chocolate power is a solution.
d)
The chocolate powder is a chemical.
7.
In Luis's experiment, water acts as a solvent. Why is this statement true?
a)
The water evaporates.
b)
The water changes state.
c)
The water dissolves the sugar.
d)
The water changes the sugar to a gas.
8.
Tyrell makes a salad dressing. He puts 150 mL of oil and 150 mL of vinegar in a jar and shakes it. After 5 minutes, the oil is on top of the vinegar. What can Tyrell conclude about the salad dressing?
a)
Oil is a solvent and vinegar is a solute.
b)
More oil is needed to dissolve the vinegar.
c)
The oil and vinegar have formed a mixture.
d)
The oil and vinegar have formed a solution.
9.
Solutions come in many forms. Which of the following is a solution?
a)
a gram of sugar
b)
a handful of soil
c)
a liter of salt water
d)
a cup of noodle soup
10.
Petra has four beakers. Each one contains 250 mL of water. She adds red food coloring to one beaker, sand to the second beaker, ice cubes to the third beaker, and marbles to the last one. She then stirs each beaker. Which statement is true about the beakers.
a)
One beaker contains a solution
b)
Two beakers contain a solution
c)
Three beakers contain a solution
d)
All the beakers contain a solution
11.
Which chemical property causes iron to become a crumbly, brownish-orange substance over time?
a)
its ability to rust
b)
its ability to burn
c)
its ability to bend
d)
its ability to tarnish
12.
Silver can be stored in a special box to prevent tarnishing. Suppose one silver earring is kept in a box and one is left out. Several months later, the earring that was left out is tarnished. The one in the box is not. Which statement is true?
a)
Tarnishing is a change in mass.
b)
Tarnishing is a physical change.
c)
Tarnshing is a chemical change.
d)
Tarnishing is a change in state of matter.
13.
The words in these groups describe ways matter can change. Which group lists only chemical changes?
a)
iron rusting, glass breaking, plastic stretching
b)
copper tarnishing, wax melting, wood burning
c)
leaves rotting, milk spoiling, food being digested
d)
ice melting, water boiling, salt dissolving in water
14.
When wood burns, a chemical change takes place and smoke and ash form. Which statement best describes this change?
a)
New substances form, and the mass of the matter changes.
b)
No new substances form, and the mass of the matter changes.
c)
New substances form, but the mass of the matter stays the same.
d)
No new substances form, but the mass of the matter stays the same.
15.
Lucia uses a steel wool scrubbing pad to clean a frying pan. If she leaves the wet pad in the kitchen sink for a few days, what will happen?
a)
The pad will rust.
b)
The pad will spoil.
c)
The pad will tarnish.
d)
The pad will not change.
16.
Theo and his family take their bikes to the beach. When they return home, Theo notices that the bike chains are rusty, but the frames are not. What can Theo conclude from his observations?
a)
The frames and the chains are both made of steel.
b)
The frames and the chains are both made of copper.
c)
The frames are made of aluminum and the chains of steel.
d)
The frames are made of silver and the chains are made of copper.
17.
Sometimes our senses tell us when matter has undergone a chemical change. Which of the following is a clue that steel has rusted?
a)
a strong ordor
b)
a change in color
c)
the production of light
d)
the formation of gas bubbles
18.
What would be the best way to prevent steel wool from rusting?
a)
keep it slightly moist
b)
moisten it but expose it to the air
c)
keep it dry and sealed in a plastic bag
d)
moisten it and keep it in a sealed plastic bag
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