Project-2 Culminating Task 7C

1. Which of the following is an example of an element?

• Water

• Oxygen

• Common Salt

• Air

A mixture is:

• A substance that cannot be separated into simpler substances.

• A substance made of only one type of atom.

• A combination of two or more substances that are not chemically bonded.

• A substance that is chemically bonded and cannot be separated.

Which of the following is a compound?

• Iron

• Carbon dioxide

• Nitrogen

• Hydrogen

Which of the following is a property of a mixture?

• It has a fixed composition

• Its components can be separated by physical methods

• Its components are chemically bonded

• It has only one type of atom

Which of the following substances is made up of only one type of atom?

• Water

• Iron

• Air

• Salt

Which of the following is an example of a homogeneous mixture?

• Sand and water

• Salad

• Air

• Oil and water

What happens when a compound is formed?

• The elements are mixed together physically

• The elements are chemically bonded to form a new substance

• The elements lose their properties completely

• The elements can be easily separated by physical means

Which of the following is NOT a property of compounds?

• They are made up of two or more elements

• They have properties different from the elements that form them

• They can be separated by physical methods

• They are chemically bonded

Which of the following is an example of a heterogeneous mixture?

• Saltwater

• Brass

• Salad

• Air

Which of these is a physical change that occurs when mixing two substances?

• A new substance is formed

• The substances cannot be separated

• The substances retain their individual properties

• The substances are chemically bonded