Chemical Changes Quiz

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Questions and Answers

What is the gas molecule produced when charcoal burns?

carbon dioxide

Define chemical changes and provide an example.

Chemical changes involve the formation of new substances with different properties. Example: baking dough.

What is the term used by scientists to describe a chemical change?

chemical reaction

What does the arrow in a chemical equation represent?

separates reactants and products Signup and view all the answers

Explain the law of conservation of mass in chemical reactions.

Matter is neither destroyed nor created, only transformed from one form to another. Signup and view all the answers

What indicates the formation of new substances in a chemical reaction?

Bonds form between atoms in different ways or separate. Signup and view all the answers

What is the difference between a physical change and a chemical change?

A physical change does not produce new substances and only affects the physical properties, while a chemical change results in the formation of new substances with different chemical properties. Signup and view all the answers

Explain how atoms are involved in the process of forming new substances.

Atoms bond with other atoms to form chemical bonds, which result in the formation of new substances. Signup and view all the answers

Provide an example of a chemical change and explain what happens at the atomic level.

When coal burns, the oxygen molecules in the air bond with the carbon atoms to form new molecules of carbon dioxide, which have different properties. Signup and view all the answers

What are some signs that may indicate a chemical change is taking place?

Changes in color, release of gases, and release of heat or light can be signs of a chemical change. Signup and view all the answers

Why does a change in the color of water when food coloring is added not indicate a chemical change?

The color change in water with food coloring is due to a mixture of substances that can be separated by physical means, such as evaporation or distillation. Signup and view all the answers