Item 8
Rachel notices that many objects at the recycling center have rusted. Rusting is a chemical change that some metal and steel objects undergo when they are exposed to oxygen. Which option best describes a chemical change?
A.) a change in matter that produces one or more new substances
B.) a change in form or appearance of matter
C.) a change from solar energy to chemical energy
D.) a change from a liquid state to a gas state
Answers
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Let’s look at each of these options.
Option - B
A change in form or appearance of matter. That’s the exact definition of physical change. Therefore Option B is wrong.
Option - C
Rusting doesn’t involve solar energy or chemical energy, therefore the option is wrong.
Option - D
A change from a liquid state to a gas state is a physical change. Therefore, this option is wrong.
Hence, one option is left which is Option - A, “A change in matter that produces one or more substances”. Option - A is feature of chemical change and it occurs in rusting, therefore Option A is the right answer.
Conclusion : Option A is the right answer.
Hope this helps! <3
Option - B
A change in form or appearance of matter. That’s the exact definition of physical change. Therefore Option B is wrong.
Option - C
Rusting doesn’t involve solar energy or chemical energy, therefore the option is wrong.
Option - D
A change from a liquid state to a gas state is a physical change. Therefore, this option is wrong.
Hence, one option is left which is Option - A, “A change in matter that produces one or more substances”. Option - A is feature of chemical change and it occurs in rusting, therefore Option A is the right answer.
Conclusion : Option A is the right answer.
Hope this helps! <3
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