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alina1380 [7]
3 years ago
7

PLEASE HELP

Biology
1 answer:
madam [21]3 years ago
8 0

Answer:

1.a, 2.b, 3. c, 4. c, 5. c

Explanation:

1.

4H+O2→2H2O 

2.

They must have two or more reactants.

3.

The reaction has more than one product.

4.

S + O2→SO2

5.

2Mg+O2→2MgO

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