Chemistry Final test (Fill in the blank)

Liquefied petroleum gas is composed of propane and ____.

___ takes place in huge reactor.

Natural gas consists mainly of ____.

Coal is used in many countries to produce _____.

_____ are fuels produced from renewable resources.

Crude oil is mixture of many different ____ molecules.

A mixture of methane and steam is passed over a _____ catalyst.

_____ forms as the rubbish decays.

Nitrates from the atmosphere are ____ on the soil.

_____ helps in the treatment of alkaline soils.