Matter can undergo physical and chemical changes. A physical change is a change of matter from one form to another without a change in the identify of the substance. Which process is an example of a physical change?

Pablo notices that ice cream begins to melt when left out at room temperature. What is Pablo observing?

Gallium is a metal. If you hold a solid piece of pure gallium in your hand, your body warmth will melt the gallium. What is this an example of?

In the laboratory, Austin is given a mixture of iron filings, sand, and salt. To separate the mixture, Austin uses a magnet, boiling water, and a filter. Which statement is true about the process Austin uses to separate this mixture?

A molecule is involved in a chemical reaction, causing the arrangement of its atoms to change. What is the result of this process?

There are several differences between chemical and physical changes. Which process is an example of a chemical change?

Alison finds the total mass of a sample of baking soda, a balloon, and a glass container with vinegar in it. She adds the baking soda to the vinegar and immediately places the balloon over the mouth of the container. After the reaction is complete,

Rita wants to make some toast for breakfast, which she knows involves a chemical change to the bread. She puts a slice of bread in the toaster, but, after 10 minutes, she notices that the sides of the bread are black. What caused this chemical change

Which types of changes observe the law of conservation of mass?

When paper is burned, the mass of the remaining ash is less than the mass of the original paper. Which statement best explains this result?

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