There are 15 questions in this quiz.  The order of the questions and answers is randomized each time you take the quiz. 

Physical changes in matter occur when there is a change in the form or appearance of a substance that does not change it into a new substance. For example, cutting a sheet of paper with scissors is an example of a physical change. Tearing, bending, and phase changes are also examples of physical changes.
 
You learned about the three states of matter (solids, liquids and gases) and how matter can change from one state to another by adding or removing heat. When a solid changes into a liquid, the solid melts. When a liquid changes into a solid, the liquid freezes. When a liquid changes into a gas, the liquid evaporates. When a gas changes into a liquid, the gas condenses. These are examples of physical changes.
 
Chemical changes are changes that produce a new substance that was not present before the chemical reaction took place. The mixture of vinegar and baking soda in Activity 3 is an example of a chemical change. In a chemical change you may see changes in color or temperature or the formation of a gas or a solid. You may be familiar with some of the common examples of chemical changes, including cooking, digestion, photosynthesis, burning, and decaying of animals or plants.

The password is your teacher's last name in lowecase letters.