Indicators of Chemical Changes

Which of the following is an indicator that a chemical change has occurred?

• Change in temperature

• Change in shape

• Increase in size

• Decrease in mass

What is a sign of a chemical change involving the formation of a new substance?

• Change in color

• Change in texture

• Change in size

• Change in weight

Which of the following indicates the presence of a chemical change through the release of a substance?

• Formation of a solid

• Formation of a liquid

• Presence of gas/bubbles

• Presence of light

Which indicator of a chemical change involves a change in smell?

• Change in texture

• Scent or odour

• Change in volume

• Change in density

What is an indicator of a chemical change that involves the creation of a new solid?

• Formation of a solid

• Formation of a liquid

• Formation of a gas

• Formation of a plasma

What is the basic unit of a chemical element?

• Molecule

• Atom

• Proton

• Neutron

What are atoms made from?

• Only protons

• Protons and electrons

• Protons, neutrons, and electrons

• Neutrons and electrons

What is a molecule?

• A single atom

• Two or more atoms bound together

• A group of protons

• A type of neutron

What is a molecule?

• A single atom

• Two or more atoms joined chemically

• A mixture of elements

• A type of compound

What defines a compound?

• A single element

• A molecule with identical atoms

• A molecule with at least two different elements

• A mixture of compounds