1. Intro to General Chemistry

Which of the following is the best indication that a chemical change has occurred?

When a solution containing dissolved elements and compounds is left to evaporate, what typically happens to the dissolved substances after the water has evaporated?

During which change of state do atoms lose energy?

Which of the following is a reliable indicator that a chemical change has occurred?

Which of the following best describes what occurs during a chemical change?

Which of the following is NOT an example of a chemical change?

Which of the following is NOT a chemical change?

A gaseous substance turns directly into a solid. Which term describes this change?

Which type of change occurs when water evaporates?

Which change of state occurs during vaporization?

Which of the following best explains why the dissolving of sugar in water is considered a physical change?

Which type of change occurs when water is boiled?

Which of the following best explains why the melting of ice is not considered a chemical change?

Which of the following best describes what happens during a physical change?

Which observation best indicates that a change is a physical change rather than a chemical change?