Chemistry Test 2 Review

Fossil Fuels are

• pieces of rock that have been compacted many times

• rock that contains 50% plant and animal remains

• metamorphic rock

• fuels that form from the remains of plant and other organisms that were buried and altered over million of years

Coal is formed from

• rocks

• a factory

• remains of small organisms that lived many millions of years ago in our oceans

• plant remains along with heat and pressure

Fossil fuels are classified as nonrenewable because they.......

• require expensive equipment
• take millions of years to replace
• can be found all over 
• provide all the energy we use

Corn, wheat, and soybeans can be made into a substance called ethanol. In some places, ethanol is part of a mixture used to power cars and trucks. What type of alternative energy resource is ethanol?

• Hydroelectric
• Geothermal
• Biofuels
• Solar

when a hydrocarbon burns in a plentiful supply of oxygen what are the products?

• carbon dioxide only

• water only

• carbon dioxide and water

• carbon only

which of the following is a toxic gas released when hydrocarbons undergo incomplete combustion?

• carbon dioxde

• oxygen

• carbon monoxide

Crude oil is made up of:

• Ethane

• Butane

• A mixture of different hydrocarbons

• Extremely large hydrocarbons which are broken up once extracted

A separation technique which uses a fractionating column to separate different liquid components in a mixture with different boiling points by heating mixture is called

• Fractional distillation
• filtration
• crystallization
• evaporation

Which of these substances is not a hydrocarbon?

• methane

• ethane

• propane

• butane

• ammonia

Fractional distillation separates crude oil based on the different __________ of the molecules in the mixture

• melting point

• boiling point

• freezing point

• chemical reactivity