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
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
Answers
GPT-4o mini
In the chemical reaction \(2H_2 + O_2 \rightarrow 2H_2O\), there are initially four hydrogen atoms (since \(2H_2\) means 2 molecules of \(H_2\), and each molecule contains 2 hydrogen atoms).
After the reaction, we produce \(2H_2O\) which also contains hydrogen atoms. Each water molecule (\(H_2O\)) contains 2 hydrogen atoms, and since we have 2 water molecules, we have:
\[
2 \text{ molecules of } H_2O \times 2 \text{ H atoms per } H_2O = 4 \text{ H atoms}
\]
Therefore, after the reaction, there are still 4 hydrogen atoms present.
The correct response is:
**4**
After the reaction, we produce \(2H_2O\) which also contains hydrogen atoms. Each water molecule (\(H_2O\)) contains 2 hydrogen atoms, and since we have 2 water molecules, we have:
\[
2 \text{ molecules of } H_2O \times 2 \text{ H atoms per } H_2O = 4 \text{ H atoms}
\]
Therefore, after the reaction, there are still 4 hydrogen atoms present.
The correct response is:
**4**