WorksheetsChapter 12 Changes in Matter
Total questions: 15
Worksheet time: 8mins
Name
Class
Date
1.
Which change below is a chemical change?
a)
One kind of matter changes into another kind of matter with different properties.
b)
One kind of matter changes its shape and volume
c)
One kind of matter keeps its identity and properties.
d)
One kind of matter changes phases
2.
Which of the following is an example of combustion?
a)
a log burning in a fire
b)
a dry sponge expanding in water
c)
a piece of gray metal turning to rust
d)
a container of milk souring to cottage cheese
3.
What is the product of the reaction?
C + O2 => CO2
carbon + oxygen => carbon dioxide
C + O2 => CO2
carbon + oxygen => carbon dioxide
a)
carbon
b)
oxygen
c)
dioxide
d)
carbon dioxide
4.
Which of the following describes what happens during a chemical reaction?
a)
Matter is destroyed
b)
Matter is not changed
c)
Matter created and destroyed
d)
Matter is neither created nor destroyed
5.
What kind of chemical reaction is shown by the model?
a)
reduction reaction
b)
replacement reaction
c)
combination reaction
d)
decomposition reaction
6.
A scientist used universal indicator paper to test an unknown substance. The indicator paper turned red. What can the scientist conclude about the substance?
a)
It is a weak acid.
b)
It is a weak base.
c)
It is a strong acid.
d)
It is a strong base.
7.
What bacteria-killing substance did Alexander Fleming accidentally discover that became an important life-saving medicine?
a)
insulin
b)
aspirin
c)
vitamins
d)
penicillin
8.
Look at the illustration below.
This tent is made from a polymer developed in a chemical laboratory. What is the name of the polymer?
This tent is made from a polymer developed in a chemical laboratory. What is the name of the polymer?
a)
silk
b)
wool
c)
nylon
d)
cotton
9.
What should you do FIRST before using chemicals at home?
a)
Read the directions.
b)
Put on safety goggles.
c)
Ask a friend what to do.
d)
Wear a long shirt and pants.
10.
What kind of reaction occurs when two compounds SPLIT APART and the parts switch places, as shown in the reaction below?
FeS + 2HCl => FeCl2 + H2S
FeS + 2HCl => FeCl2 + H2S
a)
reduction reaction
b)
replacement reaction
c)
combination reaction
d)
decomposition reaction
11.
Fossils can be found in limestone. Explain how scientists can use a chemical reaction to separate a fossil from limestone without damaging the fossil.
a)
Scientists can use vinegar to wear away the limestone.
b)
The vinegar reacts chemically with the limestone and dissolves the limestone around the fossil.
c)
The fossil remains undamaged because the vinegar does not react with the fossil.
d)
All of the above.
12.
Explain how treated rubber, which is heated and has sulfur added, has different properties from untreated rubber.
a)
Treated rubber does not dry or crack during cold weather or melt during warm weather.
b)
Treated rubber has prettier physical properties.
c)
Treated rubber undergoes combustion.
d)
Treated rubber is a bacteria-killing substance.
13.
Why is treated rubber more desirable?
a)
Treated rubber can be used in all climates year-round for such items as automobile tires.
b)
Treated rubber is a bacteria-killing substance.
c)
Treated rubber is a polymer used in tents.
d)
Treated rubber can separate fossils from limestone.
14.
What are some examples of chemical technology where chemists make new substances?
a)
concrete
b)
vitamins
c)
antibiotics
d)
all of the above
15.
What are the properties that make these materials useful for human lives?
a)
When cement mixes with water, gravel, and sand to create hard and durable concrete.
b)
Vitamins are added to food to keep the body healthy.
c)
All of the above.
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