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

2
2

4
4

5
5

8
8

Answer 1

In the chemical reaction \(2H_2 + O_2 \rightarrow 2H_2O\), there are 4 hydrogen atoms on the left side (since \(2H_2\) means there are \(2 \times 2 = 4\) hydrogen atoms).

After the reaction, in the water molecule \(2H_2O\), there are also 4 hydrogen atoms (since \(2H_2O\) means there are \(2 \times 2 = 4\) hydrogen atoms).

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

So the correct response is:

4