Chemical Reactions Quick Check

Question

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Question
Use the chemical reaction to answer the question.

2H2+O2→2H2O


There are four atoms of hydrogen ( H
) before the reaction. How many atoms of hydrogen are present after the reaction?

(1 point)
Responses

8
8

2
2

4
4

5
5
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Answer 1

In the chemical reaction \( 2H_2 + O_2 \rightarrow 2H_2O \), there are indeed four atoms of hydrogen on the reactant side (since \( 2H_2 \) indicates 2 molecules of diatomic hydrogen, which is 2 x 2 = 4 hydrogen atoms).

On the product side, the formula \( 2H_2O \) indicates that there are also 4 hydrogen atoms present (since there are 2 molecules of water, and each water molecule contains 2 hydrogen atoms, so 2 x 2 = 4 hydrogen atoms).

Thus, the number of hydrogen atoms after the reaction is 4.

The correct response is 4.