Chemical Reactions Quiz

What happens during a chemical reaction?

• Molecules move from one place to another without changing.

• Two or more molecules interact and change into a new substance.

• Atoms are removed from molecules.

• Energy is the only thing produced.

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What occurs to the bonds between atoms during a chemical reaction?

• Bonds between atoms are only observed but not altered.

• Bonds between atoms are duplicated to create mirror molecules.

• Bonds between atoms are broken and created to form new molecules.

• Bonds between atoms become stronger and unbreakable.

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Based on the chemical equation provided, what are the products of the reaction between methane (CH₄) and oxygen (O₂)?

• CO₂ and CH₄

• CO₂ and 2H₂O

• 2O₂ and 2H₂O

• CH₄ and 2O₂

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What is a physical change?

• A change that alters the identity of a substance into a new substance

• A change that only affects the form or appearance of a substance without creating a new substance

• A change that cannot be reversed

• A change that occurs only in solid substances

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

• Burning wood

• Rusting of iron

• Dissolving sugar in water

• Cooking an egg

Which of the following is NOT an example of a physical change?

• Whipping eggs

• Boiling water

• Dicing vegetables

• Baking a cake

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

• Changing the state of matter

• Changing the chemical composition

• Changing the molecular structure

• Changing the type of atoms

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What happens during a chemical change?

• Substances change their state from solid to liquid or gas

• Substances join to form new substances with new chemical properties

• Substances change their shape or size without forming new substances

• Substances dissolve into another substance without a chemical reaction

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

• Water boiling

• Ice melting

• Iron rusting

• Sugar dissolving in water

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What is a common observation when a chemical change occurs?

• The substance returns to its original form after some time

• The substance changes color or temperature without new substances being formed

• New substances are formed with different chemical properties

• The substance changes its state but retains its chemical properties

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