Compounds and mixtures

Question 1

What are pure substances?

Answer 1

Elements or compounds

Question 2

What types of materials can there be?

Answer 2

Pure substances with distinct measurable properties or mixtures with properties dependent on the identity and relative amounts of the substances that make up the mixture

Question 3

Heterogeneous vs homogeneous mixtures

Answer 3

Homogenous mixtures have a uniform composition whereas heterogenous mixtures have a non-uniform composition.

Question 4

What are nano materials?

Answer 4

Substances that contain particles in the side range1-100 nm and have specific properties relating to the size of the particles

Question 5

Properties of nano materials

Answer 5

Large surface area compared to their volume (large surface area to volume ratio)

Question 6

Why is a large surface area to volume ratio important?

Answer 6

1) allows nanoparticles to absorb many molecules
2) Nanoparticles can transport other molecules which are absorbed into them
3) Their large surface area allows nanoparticles to act as catalysts