Chapter 2 Practice                                                                   Name ____________________________________

 

Visualing Concepts

Instructions: Use squares (    ) to represent atoms of zinc and circles (    ) to represent atoms of sulfur.

Draw Pictures with the boxes to represent how the atoms would be arranged in the following.

 

Liquid sulfur

 

Gaseous zinc

 

 

 

 

 

A homogenous mixture of solid sulfur and zinc

 

A heterogeneous mixture of solid sulfur and zinc

 

 

 

 

 

A compound of zinc and  sulfur with formula ZnS

 

Solid sulfur

 

 

 

Classifying Properties

Instructions: Classify the following as Physical or chemical properties and as intensive or extensive properties.

Property

Chemical ( C ) or Physical ( P )

Intensive ( I ) or extensive ( E )

Water boils at 100 degrees Celcius.

 

 

Diamonds are capable of cutting glass.

 

 

Water can be separated by electrolysis into hydrogen and oxygen.

 

 

Sugar is capable of dissolving in water.

 

 

Vinegar will react with baking soda.

 

 

Yeast acts on sugar to form carbon dioxide and ethanol.

 

 

Wood is flammable.

 

 

A soda bottle holds 2 liters

 

 

Ammonia is a gas at room temperature.

 

 

Bromine has a red color.

 

 


Classifying Properties

Instructions: Identify whether the following are physical or chemical changes. If they are chemical identify one property that changed between the old substance(s) and the new ones

Change

Chemical ( C ) or Physical ( P )

Changed Property

Iron rusts in a damp environment.

 

 

Dry ice, solid carbon dioxide, is sublimed at room temperature.

 

 

Gasoline burns in the presence of oxygen

 

 

Hydrogen peroxide decomposes to water and oxygen.

 

 

Frying an Egg

 

 

Dissolving sodium hydroxide into water.

 

 

Distilling crude oil to separate the gasoline.

 

 

Digestive fluids breaking down food.

 

 

 

 

Classifying Properties

Circle the words in the following lists that  are evidence of a chemical change:

Change in Smell          Color change                           Production of gas                    Production of heat

Change in size             Change in shape                      Change in phase                      Production of light

Formation of a precipitate

 

Conservation of Mass

In an engine, octane combines with oxygen to form carbon dioxide and water. If. 22.8 grams of octane combine completely with 80 grams of oxygen to form 70.4 grams of carbon dioxide, what mass of water is formed?