1. Intro to General Chemistry

Why are most chemical changes difficult to reverse?

Which statement best explains how chemical weathering differs from physical weathering?

Which of the following best describes the difference between a physical change and a chemical change?

Which of the following best describes what happens to water when it freezes?

Which of the following best describes how a chemical change can be reversed?

A container is observed to have water boiling and turning into steam. What does this represent about the type of change happening in the container?

Which of the following terms describes the process by which a solid changes to a liquid?

A model shows water vapor turning directly into solid ice without passing through the liquid phase. Which change of state is represented in this model?

Stepping on a bag of potato chips would cause which type of change?

After a phase change from solid to liquid, how would you describe the appearance of the substance?

Which of the following best describes what happens when a solid melts?

Which of the following is an example of a chemical change?

Which of the following is NOT a physical change?

Which of the following is an example of a chemical change?

Which of the following methods can cause a substance to change from a solid to a liquid or from a liquid to a gas?