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Chemical Reactions Review

Last updated 14 days ago
22 questions

Is This a Chemical Reaction?

Ice Melting:

1

What are the properties of ice (before it melts)?

1

Is there evidence of a chemical reaction when ice melts? Choose which evidence below is in the chemical reaction.

1

Is this a chemical reaction?

1

Explain your answer for the last question

Candles burn:

1

What are the properties of this candle?

3

Is there evidence of a chemical reaction when a candle is burning? Choose which evidence below is in the chemical reaction. Select all that apply.

1

Is this a chemical reaction?

1

Explain your answer for the last question

Baking Soda and Vinegar Mixing:

1

What are the properties of baking soda and vinegar mixing?

1

Is there evidence of a chemical reaction when ice melts? Choose which evidence below is in the chemical reaction.

1

Is this a chemical reaction?

1

Explain your answer for the last question

What Happens Before a Chemical Reaction?

Ca + 2H2O → Ca(OH)2 + H2

Before After

1

Type the number of Ca (calcium) atoms before the reaction

1

Type the number of O (oxygen) atoms before the reaction

1

Type the number of H (hydrogen) atoms before the reaction

What Happens After a Chemical Reaction?

Ca + 2H2O → Ca(OH)2 + H2

Before After

1

Type the number of Ca (calcium) atoms after the reaction

1

Type the number of O (oxygen) atoms after the reaction

1

Type the number of H (hydrogen) atoms after the reaction

Ca + 2H2O → Ca(OH)2 + H2

Before After

1

What happens during a chemical reaction? What is made?

0

What happens to the atoms that make up the molecules of substances during a chemical reaction?

1

Did any atoms appear or disappear?

1

What do you notice about the number of atoms before and after the chemical reaction?