Y11 Mock Structure and Bonding

Question 1

what are intermolecular forces

Answer 1

weak forces between molecules in substances

Question 2

what does the size of a molecule affect the IM forces

Answer 2

increase with the size of the molecule
large molecules have higher melting and boiling points

Question 3

what happens when a substance melts or boils (in terms of iM forces compared to bonds)

Answer 3

IM forces are overcome not the covalent bonds

Question 4

what are metals

Answer 4

giant structures of atoms with strong metallic bonding

Question 5

melting and boiling points of metals

Answer 5

high

Question 6

properties of pure metals

Answer 6

atoms arranged in layers
can be bent/shaped

Question 7

what is an alloy

Answer 7

a mixture of two or more different metals

Question 8

why are alloys harder than pure metals

Answer 8

the other metal distorts the layer so they can’t slide over each other , making it harder

Question 9

why are metals good conductors of electricity

Answer 9

delocalised electrons in the metal carry electrical charge and move freely through the metal

Question 10

why are metals good conductors of thermal energy

Answer 10

the delocalised electrons gain kinetic energy and move faster , and transfer gained energy through the metal

Question 11

size of nanoparticles

Answer 11

1-100nm in size

Question 12

size of fine particles

Answer 12

100-2500nm

Question 13

size of coarse particles

Answer 13

2500-10000nm

Question 14

uses of nanoparticles

Answer 14

medicine, electronics, sun cream, deodorants, catalysts

Question 15

properties of nanoparticles

Answer 15

aren’t very reactive
small

Question 16

risks of nanoparticles

Answer 16

so small that they can be inhaled and enter the lungs
when in the body they can initiate harmful reactions and toxic substances could bind to them