A 7th-grade Chemistry Review Test
This quiz consisting of 10 questions of various topics of chemistry, is perfect for all the 7th-grade students who are preparing for their final exams. It's a review test and has random questions from 7th-grade chemistry books.
- 1.
Which of the following is a chemical property of wood?
- A.
Wood can be burned in a fireplace.
- B.
Wood is a solid that will float on water.
- C.
The bark is a darker color than the inside.
- D.
Wood can be chopped into smaller pieces.
Correct Answer
A. Wood can be burned in a fireplace.Explanation
Chemical properties can only be observed by changing the substance. This means the ability to burn is a chemical property. Properties dealing with shape, size, density, color, texture, and even state of matter are all physical properties.Rate this question:
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- 2.
Which kitchen job involves a chemical change?
- A.
Making ice cubes
- B.
Toasting bread
- C.
Slicing a carrot
- D.
Boiling water
Correct Answer
B. Toasting breadExplanation
Chemical changes result in a new substance. Toast is different from bread in color, taste, and texture - chemical change. Ice, water, and steam are all forms of water - physical changes. Sliced carrots are still carrots, only smaller - physical change!Rate this question:
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- 3.
Dissolving sugar into sweet tea is an example of a
- A.
Chemical change
- B.
Physical change
- C.
State of matter change
- D.
Energy change
Correct Answer
B. Physical changeExplanation
Dissolving sugar into tea does not make a new substance - the sugar is still there, just so tiny you can't see the particles anymore. But you sure can taste them! This is a physical change.Rate this question:
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- 4.
Which property of matter stays the same during both physical and chemical changes?
- A.
Density
- B.
State of matter
- C.
Mass
- D.
Color
Correct Answer
C. MassExplanation
The law of conservation of matter states that matter cannot be created or destroyed. The amount or mass of matter must always remain the same.Rate this question:
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- 5.
Each of the pictures above shows a change that produces bubbles. Which one shows a physical change?
- A.
Pouring vinegar onto baking soda
- B.
Dropping an antacid into water
- C.
Heating water to boiling
- D.
Dropping Mentos into Diet Coke
Correct Answer
C. Heating water to boilingExplanation
Water boiling is changing state of matter from liquid to gas - but it is still water. This is a physical change. The other bubbles are produced by chemical reactions.Rate this question:
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- 6.
O2 + 2H2 --> 2H2O In this equation, the O2 is a
- A.
Reactant
- B.
Product
- C.
Mixture
- D.
Solution
Correct Answer
A. ReactantExplanation
The left side of a chemical equation shows reactants. The right side has the products.Rate this question:
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- 7.
Which statement is true about acids?
- A.
Acids turn litmus paper blue.
- B.
Acids are slippery and taste bitter.
- C.
All acids can harm you.
- D.
Acids have a pH below 7.
Correct Answer
D. Acids have a pH below 7.Explanation
pH levels below 7 are acids - the lower the pH number, the stronger the acid!Rate this question:
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- 8.
Common examples of bases include
- A.
Lemons, vinegar and bleach
- B.
Soap, ammonia and sodas
- C.
Detergent, antacids and shampoo
- D.
Oranges, tomatoes, and digestive juices
Correct Answer
C. Detergent, antacids and shampooExplanation
Many cleaning products are bases. They are also used to neutralize acids. Therefore, detergents, antacids, and shampoo would be three good examples of bases.Rate this question:
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- 9.
If a substance turns blue litmus paper red, and does not change red litmus paper, it is:
- A.
An acid
- B.
A base
- C.
Neutral
- D.
It is not possible to determine
Correct Answer
A. An acidExplanation
Litmus paper turns red with an acid and blue with a base.Rate this question:
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- 10.
Predict the pH of lye, a strong base used in oven cleaners.
- A.
2
- B.
6
- C.
8
- D.
13
Correct Answer
D. 13Explanation
Bases have a pH more than 7. The farther from 7, which is neutral, the stronger the base. So a pH of 13 would be more accurate for a strong base.Rate this question:
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Current Version
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Mar 22, 2023Quiz Edited by
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Nov 04, 2009Quiz Created by
Hboudrea
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