Elements, Compounds and Mixtures

Which of the following is NOT a mixture?

• Milk

• Air

• Carbon dioxide

• Soil

True or False: Mixtures can usually be separated by physical methods.

• True

• False

• Sometimes

• Only with chemical methods

What is formed when two or more elements combine chemically?

• Mixture

• Atom

• Compound

• Solution

What do we call a mixture where the substances are not evenly mixed?

• a) Homogeneous mixture

• b) Heterogeneous mixture

• c) Compound

• d) Solution

True or False: Elements can be broken down into simpler substances by chemical means.

• True

• False

• Only in certain conditions

• Only with nuclear reactions

Salt (NaCl) is an example of a:

• a) Mixture

• b) Compound

• c) Element

• d) Solution

Which of these is a compound?

• a) Hydrogen

• b) Iron

• c) Water

• d) Oxygen

Which of the following is a mixture?

• a) Fruit Chaat

• b) Water

• c) Gold

• d) Carbon dioxide

Which of these is the best example of a homogeneous mixture?

• a) Oil and water

• b) Fruit salad

• c) Saltwater

• d) Sand and iron filings

Which of these is an element?

• a) Water

• b) Oxygen

• c) Salt

• d) Sugar