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Questions and Answers
Which of the following is an example of an exothermic reaction?
Which of the following is an example of an exothermic reaction?
- Heating of Lead nitrate
- C + O → CO + 393.5 kJ (correct)
- N2 + 3H2 → 2NH3 + 92.3 kJ
- N2 + O2 + 180
Which of the following is a characteristic of a chemical change?
Which of the following is a characteristic of a chemical change?
- No change in mass
- Temporary alteration
- New substances are produced (correct)
- No change in energy
What happens to the mass of an object during rusting of iron?
What happens to the mass of an object during rusting of iron?
- The mass becomes lighter
- The mass decreases
- The mass remains constant
- The mass increases (correct)
Which process results in the absorption of heat energy?
Which process results in the absorption of heat energy?
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What is another name for a chemical change?
What is another name for a chemical change?
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