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Questions and Answers
Which of the following is a correct statement about isotopes?
Which of the following is a correct statement about isotopes?
- Isotopes have different numbers of protons
- Isotopes have the same number of protons and electrons
- Isotopes have the same atomic mass
- Isotopes have the same number of neutrons (correct)
What is the formula for calculating the number of moles of a substance?
What is the formula for calculating the number of moles of a substance?
- n = m/V (correct)
- n = N/A
- n = Q/t
- n = PV/RT
What is the difference between an exothermic and endothermic reaction?
What is the difference between an exothermic and endothermic reaction?
- Endothermic reactions release energy to the surroundings
- Exothermic reactions release energy to the surroundings
- Endothermic reactions absorb energy from the surroundings (correct)
- Exothermic reactions absorb energy from the surroundings
