1. Intro to General Chemistry

Which of the following best describes the appearance of water before it undergoes a phase change from liquid to gas?

When solid NaCl is stirred into water, which type of change occurs?

When mineral oil and food coloring are mixed, is the observed change best classified as a physical change or a chemical change?

Molten (liquid) steel and solid steel are different because of which property?

Which of the following indicates that a physical change has taken place?

Which of the following best describes the change that occurs when wood is burned?

How does the molecular motion of a substance change when it transitions from the liquid phase to the solid phase?

Which of the following transitions represents a chemical change?

Which of the following changes in the physical state of water require the input of energy?

Is the ability of a substance to support combustion considered a physical property or a chemical property?

Which type of change occurs when water evaporates from a surface?

During which of the following events would a chemical change occur?

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

Which observation would indicate that a chemical reaction occurred?

Which of the following is an example of condensation in the water cycle?