Properties and Changes in Matter

Front

What are chemical properties?

Back

Chemical properties are characteristics of a substance that can only be observed when it undergoes a chemical change, resulting in the formation of a different substance.

Front

What happens to temperature in an exothermic reaction?

Back

In an exothermic reaction, the temperature usually increases as energy is released.

Front

What happens to temperature in an endothermic reaction?

Back

In an endothermic reaction, the temperature usually decreases as energy is absorbed.

Front

What is a sign that a chemical reaction has occurred?

Back

Signs of a chemical reaction include unexpected color change, emission of odor, and production of gas.

Front

What is evidence of a chemical change?

Back

Evidence of a chemical change includes a change in temperature and an unexpected permanent color change.

Front

What are physical properties?

Back

Physical properties are characteristics of a substance that can be observed without changing its chemical identity, such as color, density, and melting point.

Front

What is the difference between physical and chemical changes?

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Physical changes do not alter the chemical composition of a substance, while chemical changes result in the formation of new substances.

Front

What is an example of a physical change?

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An example of a physical change is ice melting into water.

Front

What is an example of a chemical change?

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An example of a chemical change is rust forming on iron.

Front

What is the law of conservation of mass?

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The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; it is conserved.