Question

Chemical Change Online Practice
Complete this assessment to review what you’ve learned. It will not count toward your grade.
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Question
Which of the following pairs of compounds have molecules with different ratios of hydrogen atoms to oxygen atoms?(1 point)
Responses

H2O and H2O2
cap h sub 2 cap o and cap h sub 2 cap o sub 2

HNO3 and NaHCO3
cap h cap n cap o sub 3 and cap n A cap h cap c cap o sub 3

NaOH and H2O2
cap n A cap o cap h and cap h sub 2 cap o sub 2

H2SO4 and HNO2
cap h sub 2 cap s cap o sub 4 and cap h cap n cap o sub 2
Remaining Attempts : 3
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Answer 1

To determine which pairs of compounds have molecules with different ratios of hydrogen atoms to oxygen atoms, we can analyze the chemical formulas:

1. **H2O and H2O2**
- H2O: 2 hydrogen, 1 oxygen (ratio = 2:1)
- H2O2: 2 hydrogen, 2 oxygen (ratio = 1:1)
- **Different ratios!**

2. **HNO3 and NaHCO3**
- HNO3: 1 hydrogen, 3 oxygen (ratio = 1:3)
- NaHCO3: 1 hydrogen, 3 oxygen (ratio = 1:3)
- **Same ratios!**

3. **NaOH and H2O2**
- NaOH: 1 hydrogen, 1 oxygen (ratio = 1:1)
- H2O2: 2 hydrogen, 2 oxygen (ratio = 1:1)
- **Same ratios!**

4. **H2SO4 and HNO2**
- H2SO4: 2 hydrogen, 4 oxygen (ratio = 1:2)
- HNO2: 1 hydrogen, 2 oxygen (ratio = 1:2)
- **Same ratios!**

Based on this analysis, the pair that has different ratios of hydrogen to oxygen atoms is:

**H2O and H2O2**.