Chemistry Basics

What is an example of a substance undergoing a chemical change?

• Sour milk is an example of a chemical change.

• Water boiling to form steam.

• Ice melting into water.

• Salt dissolving in water.

What is a chemical change?

• A process where substances retain their original properties.

• A physical change that does not alter the chemical composition.

• A transformation of one or more substances into different substances with new chemical properties.

• A reaction that only involves the physical state of a substance.

What is rusting an example of?

• A physical change

• A chemical change

• A biological change

• A mechanical change

What is an example of bubbles forming during a reaction?

• Bubbles forming when vinegar is mixed with baking soda is an example of a chemical change.

• Bubbles forming when water is heated to boiling point is an example of a physical change.

• Bubbles forming when sugar dissolves in water is an example of a chemical change.

• Bubbles forming when salt is added to water is an example of a physical change.

What indicates a chemical change has occurred?

• Color change

• Change in shape

• Increase in size

• Change in texture

What is the definition of a product in a chemical reaction?

• A product is a substance that is formed as a result of a chemical reaction.

• A product is a reactant that has not yet undergone a change.

• A product is a catalyst that speeds up the reaction.

• A product is an intermediate substance that is not formed in the final reaction.

What is an example of a reversible physical change?

• Melting ice is an example of a reversible physical change.

• Burning wood is an example of a reversible physical change.

• Rusting iron is an example of a reversible physical change.

• Mixing sand and salt is an example of a reversible physical change.

What is a physical change?

• A change that affects one or more physical properties of a substance without altering its chemical composition.

• A change that alters the chemical composition of a substance.

• A change that only affects the temperature of a substance.

• A change that occurs only in living organisms.

Give an example of a physical change.

• Crumpled paper

• Burning wood

• Rusting iron

• Baking a cake

What is an example of an irreversible chemical change?

• Burning wood is an example of an irreversible chemical change.

• Melting ice is an example of an irreversible chemical change.

• Dissolving sugar in water is an example of an irreversible chemical change.

• Baking a cake is an example of an irreversible chemical change.