Chemical Reactions Review

Front

The chemical reaction for photosynthesis, without the coefficients for the reactants, is shown here:

___CO₂ + ___ H₂O (+ light) → C​₆H₁₂O₆ + 6 O₂

What is the missing coefficient for both CO₂ and H₂O?

Back

6

Answer explanation

The complete chemical equation for photosynthesis is

6CO₂ + 6H₂O (+ light) --> C6H₁₂O₆ + 6O₂. With the products given, there are 6 carbon atoms, (6C...), 12 hydrogen atoms (6H₂) and 18 oxygen atoms (O₆ and 6O_2, which equals 18 when added together. The only way to get this without changing the substances is to include a coefficient of 6 for both CO₂ and H₂O in the reactants.

Tags

PS1.B

Front

What is an element?

Back

A pure substance consisting of one type of atom

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PS1.A

Front

A chemical reaction is:

Back

When the atoms in a substance rearrange to form a new substance

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PS1.B

Front

What is a physical reaction/physical change?

Back

When a substance is changed but the atoms are NOT rearranged.

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PS1.B

Front

Matter can be neither be...

Back

created nor destroyed. It just changes form.

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PS1.B

Front

What can happen when the bonds between atoms are formed or broken?

Back

all of the above

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PS1.B

Front

How many Hydrogen atoms are in 2H₂O?

Back

4

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PS1.B

Front

Boiling water and dissolving a packet of Swiss Miss in it to make hot cocoa is...

Back

a physical reaction/physical change

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PS1.A

Front

How many Carbon atoms are in the molecule CH₄?

Back

1

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PS1.A and PS1.B

Front

How many Oxygen atoms are in the molecule 2H₃O?

Back

2

Tags

PS1.A and PS1.B