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What is the main component in natural gas?

• carbon dioxide

• methane

• nitrogen

• oxygen

What is the gas that reacts with fossil fuels during combustion to produce energy?

• carbon dioxide

• chlorine

• nitrogen

• oxygen

Biofuels are fuels made from plants and animals. One example is bioethanol, which can be produced by fermenting sugarcane. Carbon dioxide gas is given off during the production of bioethanol, as well as when it is burnt as a fuel. However, this may not result in an overall increase in the amount of carbon dioxide in the atmosphere.

Which statement explains this advantage of bioethanol as a fuel?

• A similar amount of carbon dioxide is removed from the atmosphere due to photosynthesis in the sugarcane plants.

• A similar amount of carbon dioxide is used up by the sugarcane plants during respiration.

• Bioethanol is a renewable resource.

• The combustion of bioethanol produces less carbon dioxide per carbon atom.

Biofuels are fuels made from plants and animals. One example is bioethanol, which can be produced by fermenting sugarcane. Carbon dioxide gas is given off during the production of bioethanol, as well as when it is burnt as a fuel. However, this may not result in an overall increase in the amount of carbon dioxide in the atmosphere.

Which statement explains this advantage of bioethanol as a fuel?

• A similar amount of carbon dioxide is removed from the atmosphere due to photosynthesis in the sugarcane plants.

• A similar amount of carbon dioxide is used up by the sugarcane plants during respiration.

• Bioethanol is a renewable resource.

• The combustion of bioethanol produces less carbon dioxide per carbon atom.

Biofuels are fuels made from plants and animals. One example is bioethanol, which can be produced by fermenting sugarcane. Carbon dioxide gas is given off during the production of bioethanol, as well as when it is burnt as a fuel. However, this may not result in an overall increase in the amount of carbon dioxide in the atmosphere.

Which statement explains this advantage of bioethanol as a fuel?

• A similar amount of carbon dioxide is removed from the atmosphere due to photosynthesis in the sugarcane plants.

• A similar amount of carbon dioxide is used up by the sugarcane plants during respiration.

• Bioethanol is a renewable resource.

• The combustion of bioethanol produces less carbon dioxide per carbon atom.

Different fractions in crude oil are separated by:

• Cracking

• Fractional Distillation

• Filtration

• Crystalisation

Shorter hydrocarbons have:

• Higher boiling points

• Lower boiling points

Shorter hydrocarbons have:

• Higher boiling points

• Lower boiling points

Where do long chain hydrocarbons collect?

• At the top

• In the middle

• At the bottom

Where do short chain hydrocarbons collect?

• At the top

• In the middle

• At the bottom