G9 - exam

The chemical equation for the reaction that occurs when propane gas burns is shown below. What are the products of this reaction?

C3H8 + 5O2 → 3CO2 + 4H2O

• C3H8 and 5O2

• 3CO2 and 4H2O

• 4H2O and C3H8

• 5O2 and 3CO2

Which physical property would be most useful for separating the substances ina saltwater solution?

• mass

• boiling point

• magnetism

• density

A change in ......................................is a sign that a chemical change might have occurred.

• size

• shape

• smell

• state

............................. matter in which substances are evenly mixed but not chemically bonded

• compound

• solution

• heterogenous mixture

• element

..........................matter containing atoms of two or more elements chemically bonded together.

• element

• compound

• homogenous mixture

• heterogenous mixture

Which activity could be a sign that a chemical change has occurred?

• a solid melts

• a substance dissolves

• a liquid changes color

• an object change shape

Which is NOT one of the main factors that determine the state of matter?

• particle size

• particle motion

• particle forces

• particle energy

In which state of matter do particles vibrate in place?

• plasma

• liquid

• gas

• solid

In which state of matter do molecules interact to create surface tension?

• plasma

• liquid

• gas

• solid

In which state of matter are the particles furthest apart?

• liquid

• gas

• solid