Question
A student subjected samples of water (H2O) and nitric acid (HNO3) to heat. The graph illustrates the heating curves for both substances.
According to the graph, which of the following statements must be true?
(1 point)
Responses
Water and Nitric acid will boil at the same temperature.
Water and Nitric acid will boil at the same temperature.
Water must reach a greater temperature than nitric acid to evaporate.
Water must reach a greater temperature than nitric acid to evaporate.
Nitric acid must reach a greater temperature than water to evaporate.
Nitric acid must reach a greater temperature than water to evaporate.
Nitric acid must reach a greater temperature than water to melt.
Nitric acid must reach a greater temperature than water to melt.
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According to the graph, which of the following statements must be true?
(1 point)
Responses
Water and Nitric acid will boil at the same temperature.
Water and Nitric acid will boil at the same temperature.
Water must reach a greater temperature than nitric acid to evaporate.
Water must reach a greater temperature than nitric acid to evaporate.
Nitric acid must reach a greater temperature than water to evaporate.
Nitric acid must reach a greater temperature than water to evaporate.
Nitric acid must reach a greater temperature than water to melt.
Nitric acid must reach a greater temperature than water to melt.
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Answers
GPT-4o mini
To answer your question accurately, it would be necessary to refer to a specific graph comparing the heating curves of water (H2O) and nitric acid (HNO3). However, I can provide general insights based on typical properties of these substances.
1. **Boiling Point**: Water boils at 100°C (at standard atmospheric pressure), while nitric acid (concentrated) boils at a higher temperature, around 83°C for more dilute solutions, depending on the concentration. Thus, the statement "Water and Nitric acid will boil at the same temperature" is generally false.
2. **Evaporation Temperature**: Evaporation can occur at various temperatures below boiling point. However, for nitric acid to evaporate, it typically requires lower temperatures than water, especially if considering its relatively lower molecular weight and volatility compared to water. Therefore, the statement "Water must reach a greater temperature than nitric acid to evaporate" is likely false.
3. **Melting Point**: Water freezes at 0°C, while nitric acid has a freezing point of around -42°C depending on concentration. Generally, nitric acid does not need to reach a greater temperature than water to melt. Therefore, the statement "Nitric acid must reach a greater temperature than water to melt" is false.
Based on this analysis, none of the statements presented seem to be true. If you have access to the graph, you would need to confirm boiling and melting points based on the specific curves provided. If the graph indicates different boiling or melting temperatures, the conclusions could vary.
1. **Boiling Point**: Water boils at 100°C (at standard atmospheric pressure), while nitric acid (concentrated) boils at a higher temperature, around 83°C for more dilute solutions, depending on the concentration. Thus, the statement "Water and Nitric acid will boil at the same temperature" is generally false.
2. **Evaporation Temperature**: Evaporation can occur at various temperatures below boiling point. However, for nitric acid to evaporate, it typically requires lower temperatures than water, especially if considering its relatively lower molecular weight and volatility compared to water. Therefore, the statement "Water must reach a greater temperature than nitric acid to evaporate" is likely false.
3. **Melting Point**: Water freezes at 0°C, while nitric acid has a freezing point of around -42°C depending on concentration. Generally, nitric acid does not need to reach a greater temperature than water to melt. Therefore, the statement "Nitric acid must reach a greater temperature than water to melt" is false.
Based on this analysis, none of the statements presented seem to be true. If you have access to the graph, you would need to confirm boiling and melting points based on the specific curves provided. If the graph indicates different boiling or melting temperatures, the conclusions could vary.