Chemical Reactions Video/ Reading

What is a chemical property of iron?

• Ability to rust when exposed to air and moisture

• Color

• Melting point

• Density

Which of the following is an example of a chemical change?

• Burning wood

• Melting ice

• Tearing paper

• Boiling water

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What happens during a physical change?

• The substance changes its state or appearance without forming new substances

• New substances are formed

• The chemical composition changes

• The change is usually irreversible

Which of the following is a characteristic of physical changes?

• They are often reversible

• They result in new substances

• They involve chemical reactions

• They change the chemical composition

What is chemistry the study of?

• The study of animals and their habitats

• The study of historical events

• The study of atoms, molecules, and their interactions

• The study of planets and stars

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What happens when vinegar and baking soda are mixed?

• They neutralize each other and produce carbon dioxide and water

• They explode

• Nothing happens

• They create a solid substance

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What is the main difference between vinegar and 100% acetic acid?

• Vinegar is more dangerous

• There is no difference

• Vinegar is a base

• Vinegar is less acidic

What is the purpose of wearing gloves when handling 100% acetic acid?

• To protect skin from corrosive (harmful) materials

• To keep hands clean

• No specific reason

• To prevent fingerprints on glassware

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What gas is produced in the reaction between hydrogen peroxide and potassium iodide?

• Nitrogen

• Hydrogen

• Carbon dioxide

• Oxygen

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NGSS.MS-PS1-2

Why is the reaction between hydrogen peroxide and potassium iodide exothermic?

• It absorbs heat from the surroundings

• It produces light

• It releases heat

• It changes color

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