PS Unit 4 Matter & Change

Elements are considered to be pure substances because

• they are generally unreactive.

• they have a definite composition.

• they can be either homogeneous or heterogeneous.

• they have a variable composition

All of the following are elements EXCEPT

• carbon.

• water.

• copper.

• chlorine.

The list of all known elements is called the

• Elements Almanac.

• Survey of Elements.

• Periodic Table of Elements.

• Index of Chemical Elements.

Choose which of the following is a compound.

• Carbon dioxide

• Water

• Sodium chloride

• All of the options are correct

When matter changes and forms a different composition it is a

• transformational change.

• chemical change.

• radical change.

• physical change.

All of the following are compounds EXCEPT

• ammonia - NH3.

• carbon dioxide - CO2.

• sulfur - S8.

• sodium chloride - NaCl.

A compound containing two different elements is

• magnesium (Mg).

• oxygen (O2).

• chlorine (Cl2).

• carbon dioxide (CO2).

Choose the gaseous compound from the following.

• air

• nitrogen

• oxygen

• carbon dioxide

All of the following are properties used to separate a mixture EXCEPT

• boiling point.

• evaporation.

• particle size.

• ability to undergo a chemical reaction.

Choose the mixture from the following.

• air

• iron

• hydrogen

• nickel