Alkanes and alkenes

What is the general formula for alkanes?

• CnHn+2

• CnHn

• CnH2n+2

• CnH2n

Which of the following is a characteristic of alkenes?

• Do not react with acids

• Contain carbon-carbon double bonds

• Contain only carbon-carbon single bonds

• Do not undergo addition reactions

What is the process of joining together a large number of monomers to form a polymer called?

• Cracking

• Substitution

• Polymerisation

• Combustion

Which polymer is used to make plastic bags and clingfilm?

• Poly(ethene)

• Polyvinyl chloride

• Nylon

• Polystyrene

What is the main disadvantage of using plastics?

• Flexible

• Non-biodegradable

• Waterproof

• Lightweight

Which method of recycling plastics converts plastic waste into different raw materials through chemical reactions?

• Chemical method

• Mechanical recycling

• Incineration

• Physical method

What is the economic issue associated with recycling plastics?

• Low cost of recycling

• High cost of recycling

• No environmental impact

• Easy availability of recycled plastics

How can we address the social issues related to recycling plastics?

• Implement strict laws

• Increase plastic production

• Avoid recycling programs

• Discourage creative activities

What is the main environmental issue of recycling plastics?

• Water pollution

• Land pollution

• Noise pollution

• Air pollution

Which reaction involves the addition of hydrogen or bromine across the double bond of a molecule?

• Combustion reaction

• Substitution reaction

• Cracking

• Addition reaction