Question

temperature of chemical reactions over time

1. label the chemical reactions as either endothermic or exothermic

calcium chloride
sodium sulfate
citric acid and baking soda
ammonium chloride
endothermic
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exothermic
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Explanation:

1. Calcium chloride: The graph shows its temperature rises from ~21°C to ~35°C, meaning it releases heat.
2. Sodium sulfate: The graph shows its temperature rises slightly from ~21°C to ~22°C, meaning it releases heat.
3. Citric acid and baking soda: The graph shows its temperature drops from ~21°C to ~8°C, meaning it absorbs heat.
4. Ammonium chloride: The graph shows its temperature drops from ~21°C to ~5°C, meaning it absorbs heat.

Endothermic reactions absorb heat (temperature decreases), while exothermic reactions release heat (temperature increases).

Answer:

Endothermic

• Citric acid and baking soda
• Ammonium Chloride

Exothermic

• Calcium chloride
• Sodium sulfate