C5 Transition Metals And Nanoparticles

Question 1

Uses of nanoparticules

Answer 1

Healthcare, electronics, cosmetics and chemical catalysts

Question 2

Issues with using nanoparticles

Answer 2

Could potentially harm ecosystems or be detrimental to peoples health

Question 3

Why do nanoparticles have very different properties to the bulk of that substance.

Answer 3

They have a high surface area to volume ratio causing them to act differently and have different properties and characteristics

Question 4

Characteristics of transition metals

Answer 4

• High melting point
• High density
• High strength
• Hard
• Low reactivity

Question 5

What is useful role can be played by a transition metal in another reaction

Answer 5

Can act as a catalyst to help lower activation energy and therefore energy needed for reactants to react through an alternate reaction pathway

Question 6

What is unusual about the ions transition metals form

Answer 6

They are able to form different charged ions, for example in iron Fe+2 or Fe+3

Question 7

How big can fine particles be

Answer 7

100nm - 2500nm in total span

Question 8

Why could nanoparticles damage ecosystems

Answer 8

• Could harm animals by getting into digestive systems accidentally as animals cannot see them
• Could get into food chains
• Hard to remove from ecosystems as they are not visible to human eyes