Chemical Changes Quiz

Which of the following happens to a material when it goes through a chemical change?

• The substance changes size.

• The substance changes state.

• The substance changes shape.

• The substance changes into a new substance.

In which of the following examples would you see a chemical change occur?

• Candle wax melting

• Lighting a match

• Salt dissolving in water

• Water freezing

Which of the following shows a chemical change occurring?

• ice hammer breaking ice

• making noodles

• boiling water

• baking bread

You wake up in the morning to the smell of bacon. Which evidence supports the conclusion that a chemical change is happening?

• There is a change in color.

• There is a change in state.

• There is a gas produced.

• There is an odor produced.

Which type of chemical change will produce smoke and ash?

• Burning

• Melting

• Rotting

• Rusting

Which of the following is the best way to explain how baking a cake or frying an egg is a chemical change?

• Both are changing size and shape.

• Heat is changing the texture of both substances.

• Heat is being added to both, causing a phase change.

• The end products of both cannot be reversed to their original forms.

You decided you want to make spaghetti for supper. You first light the gas stove because you need to cook the meat. When the meat is cooked, you add sauce to it. Then you put a pot of water on the stove to get it boiling. The next step is putting the spaghetti noodles in to boil. Finally, you drain the spaghetti noodles and add the sauce. Which of the following describes the chemical changes happening?

• Cooking the meat and boiling the water are both chemical changes.

• Lighting the gas stove creating a flame and cooking the meat are both chemical changes.

• Boiling the water and draining the spaghetti noodles are both chemical changes.

• Mixing the pasta sauce with the meat and boiling the noodles are both chemical changes.

Jamie completes the following steps in an experiment to investigate how temperature affects how fast something will rust in water. He places a nail in a bowl of water in the sun and a nail in a bowl of water in the shade. He also leaves an iron nail out of the water in a dry bag out of the sun. Why would Jamie leave one out of the water and out of the sun?

• Jamie also wants to test if the water affects how fast the iron nail will rust.

• Jamie notices that the size of the nail is different, so he does not want to use it later.

• Jamie doing all these steps to create a control group to compare his results to.

• Jamie puts the nail in a cooler place to see if it will rust as fast as the other items.

What is the main difference between a chemical and a physical change? Use examples to support your answer.

Buying fruit and vegetables needs to be done more often as these types of foods can quickly go rotten. What could you do to slow down the chemical change of fruits and vegetables rotting? Give a reason to support your answer.