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Thursday 2/27 - Chemical Reactions Review

Last updated 20 days ago

19 Nsɛmmisa

Did a Chemical Reaction Happen?

Chemical Reactions

What Happens Before a Chemical Reaction?

What Happens After a Chemical Reaction?

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Did a Chemical Reaction Happen?

Chemical Reaction - Substances are mixed and at least one new substance with different properties (with different molecules) is formed.

Directions:

Analyze each diagram. Look carefully at both the observable scale and the nanoscale.
Think about whether there is evidence that a chemical reaction happened.
Answer the question below each diagram.

Ice Melting:

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1.

Ice Melting: Is there evidence of a chemical reaction?

A) Color change

B) Taste change

C) Temperature change

D) Gas is made

E) Electricity is made

F) Light is made

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Candles burn:

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3.

Candles burn: Is there evidence of a chemical reaction? Select all that apply.

A) Color change

B) Taste change

C) Temperature change

D) Gas is made

E) Electricity is made

F) Light is made

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Baking Soda and Vinegar Mixing:

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5.

Baking Soda and Vinegar Mixing: Is there evidence of a chemical reaction?

A) Color change

B) Taste change

C) Temperature change

D) Gas is made

E) Electricity is made

F) Light is made

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Ca + 2H₂O → Ca(OH)₂+ H₂

_Before_After

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7.

How many Ca (calcium) atoms are there before the reaction?

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8.

How many O (oxygen) atoms are there before the reaction?

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9.

How many H (hydrogen) atoms are there before the reaction?

Ca + 2H₂O → Ca(OH)₂+ H₂

_Before_After

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10.

How many Ca (calcium) atoms are there after the reaction?

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11.

How many O (oxygen) atoms are there after the reaction?

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12.

How many H (hydrogen) atoms are there after the reaction?

Ca + 2H₂O → Ca(OH)₂+ H₂

_Before_After

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13.

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

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14.

Did any atoms created or destroyed (appear or disappear)?

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15.

Would the weight of the substances change before and after the chemical reaction?

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16.

What happens to the atoms and molecules before and after a chemical reaction?

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18.

The picture below is the beginning of a chemical reaction.
Choose the correct model after chemical reaction.

A)

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B)

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C)

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D)

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19.

Explain why you chose that answer for Question 18.

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2.

Is this a chemical reaction? Explain why.
Chemical Reaction - Substances are mixed and at least one new substance with different properties is formed.

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4.

Is this a chemical reaction? Explain why.
Chemical Reaction - Substances are mixed and at least one new substance with different properties is formed.

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6.

Is this a chemical reaction? Explain why.
Chemical Reaction - Substances are mixed and at least one new substance with different properties is formed.

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17.

Is this a chemical reaction? Explain why and explain what happened to the atoms.
Chemical Reaction - Substances are mixed and at least one new substance with different properties is formed.