pp

Question 1

ionic bonds

Answer 1

between the metal and nonmetal
use the periodic table to find this out

Question 2

ionic bonds

Answer 2

draw dot and cross diagram draw on the circles

Question 3

en asked to draw molecules

Answer 3

if there is a big 2 on the front then you draw two separate molecules

Question 4

why dont we use a high pressure

Answer 4

because more energy is needed more expensive and dangerous

Question 5

energy change and activation energy tell me the difference

Answer 5

activation energy is the big one
enrgy change is the smaller one

Question 6

what do you do when you have a power like J x10^4

Question 7

All the recorded temperature rises were lower than expected.
Explain one piece of advice you would give the students to resolve this problem

Answer 7

award (1) for resolution and (1) for sensible explanation e.g.
change glass beaker to copper can (1)
copper is a better conductor (of heat) /
increase heat transfer (1)
shield the apparatus (1)
prevent draughts / reduce heat loss to surroundings (1)
lower the beaker (nearer the flame) (1)
increase heat transfer / reduce heat loss to surroundings (1)
use a lid / insulate the beaker (1)
reduce heat loss to surroundings (1)

Question 8

ethanol as a bio fuel advantages

Answer 8

ethanol is a carbon neutral fuel
it is a renewable source