Chemical and Physical Changes

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Questions and Answers

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

  • Burning a piece of paper.
  • Melting of ice into liquid water. (correct)
  • Baking a cake from flour, eggs, and sugar.
  • Iron rusting when exposed to moisture.

Which of the following observations would MOST strongly suggest that a chemical change has occurred?

  • A substance changes from a solid to a liquid at room temperature.
  • Salt dissolving in water.
  • Formation of gas bubbles when two solutions are mixed. (correct)
  • The size of a metal block is reduced by grinding it.

Which of the following is an example of an intensive physical property?

  • Length
  • Density (correct)
  • Volume
  • Mass

Which of the following processes is primarily a chemical change?

<p>Digesting food (C)</p> Signup and view all the answers

Which of the following is NOT typically an indicator of a chemical change?

<p>Change of state (D)</p> Signup and view all the answers

In a chemical equation, what does the arrow (→) typically represent?

<p>The direction of the reaction. (A)</p> Signup and view all the answers

According to the law of conservation of mass, which statement is ALWAYS true for a chemical reaction?

<p>The total mass of the reactants equals the total mass of the products. (D)</p> Signup and view all the answers

Which of the following best describes a chemical property of a substance?

<p>Its flammability. (A)</p> Signup and view all the answers

Which process involves breaking chemical bonds?

<p>Burning gasoline in an engine. (D)</p> Signup and view all the answers

If 10 grams of reactant A are mixed with 5 grams of reactant B in a closed container, and a chemical reaction occurs, what should the mass of the products be after the reaction is complete?

<p>Exactly 15 grams. (A)</p> Signup and view all the answers

Flashcards

What is a Physical Change?

A change in the form/appearance of a substance, but not its chemical composition. It's usually reversible.

What is Melting?

Melting is the change of state from solid to liquid through the addition of heat.

What is Boiling?

Boiling is the change of state from liquid to gas, usually through heating.

What is Freezing?

Freezing is the change of state from liquid to solid, usually through cooling.

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What is Condensation?

Condensation is the change of state from gas to liquid, usually through cooling.

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What is Sublimation?

Sublimation is the change of state from solid to gas, skipping the liquid phase.

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What is Deposition?

Deposition is the change of state from gas to solid, skipping the liquid phase.

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What is a Chemical Change?

A change that results in the formation of new substances with different chemical compositions and properties. Typically irreversible.

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What is Burning (Combustion)?

Rapid reaction between a substance and an oxidant (usually oxygen) to produce heat and light.

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What is Rusting (Corrosion)?

The oxidation of iron to form iron oxide.

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