5.5 & 5.6 : Nanotechnology and Green Technology

Which is true about the size of nanoparticles?

• less than 1 nm

• 1 to 100 nm

• 100 to 1000 nm

• more than 1000 nm

Which is true about the size of nanoparticles?

• less than 1 nm

• 1 to 100 nm

• 100 to 1000 nm

• more than 1000 nm

Definition of nanoscience is

• a development of substances or gadgets using the properties of nanoparticles

• study on the processing of substances at nanoscale that are between 1 nm to 100 nm

• materials or products that are used externally to cleanse, protect or enhance one's apperances.

Nanotecgnology is widely used in

• Semiconductors and electronics

• Textile

• Medicine and Cosmetics

• Agriculture and Food

Which of the following is the structure of graphene?

• A

• B

• C

• D

What are the properties of graphene?

• Strong and hard

• permeable

• Transparent and elastic

• Good conductor of heat and electricity

Graphene is one atom thick layer of carbon atoms linked in a honeycomb-like structure. Which of the following is correct about the type of bonds in graphene?

• Hydrogen bonds

• Ionic bonds

• Covalent bonds

• Metallic bonds

What are the uses of graphene

• Electronics and energy

• Polymer and composites

• Biomedical and censors

• Agriculture and food

Electrical energy is generated from the combustion of fossil fuels such as coal. The waste gases released from these power stations can pollute the atmosphere. To reduce air pollution, the waste gases are treated with calcium carbonate powder. Which gases are filtered by calcium carbonate?

• Carbon monoxide

• Nitrogen dioxide

• Phosphorous (V) oxide

• Sulphur dioxide

Used metal containers such as aluminium tins or iron tins need to be recycled. Which of the following are the reasons for recycling them?

• Preserve natural resources

• Reduce needs to collect used tins

• Reduce the amount of waste buried in landfills

• Reduce the amount of pollution at the site of extraction of ores