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Questions and Answers
Which of the following best describes a physical change?
Which of the following best describes a physical change?
- Burning of wood
- Cooking an egg
- Melting of ice (correct)
- Formation of rust on iron
What is the behavior of gas described by Boyle's law when temperature is constant?
What is the behavior of gas described by Boyle's law when temperature is constant?
- Volume remains constant at all pressures
- Pressure is constant at all volumes
- Pressure and volume are directly proportional
- Pressure and volume are inversely proportional (correct)
Which statement best illustrates the law of conservation of mass in matter?
Which statement best illustrates the law of conservation of mass in matter?
- The total mass of reactants equals the total mass of products in a chemical reaction (correct)
- The mass of a substance decreases during a physical change
- The mass of a substance increases during a chemical reaction
- The mass of a substance remains constant during changes in states of matter
