things i need to work on SMHHHHHH Flashcards

1
Q

how do you explain the effects of INcreasing temperature on the reaction rate

A

you would THINK it would be to do with greater kinetic energy and hence more successful collisions but YOU ALSO HAVE TO SAY THAT THERES MORE PARTICLES WITH ENERGY GREATER THAN THE ACTIVATION ENERGY.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

WHAT. DO. YOU. DO. IF. YOU. NEED. TO. BALANCE. ION. ELECTRON. EQUATIONS?

A

use water.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

explain the different between bond enthalpy and mean bond enthalpy

A

mean bond enthalpy must refer to an average energy and to a number of compounds and bond enthalpy must relate to one compound/diatmoic molecule

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

in an investigation using the concentration of a reactant, why must the beaker be dry of all water before commencing a repeat experiment

A

the water can change the concentration. this keeps the concentration constant

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

why does decreasing concentration of reactants slow down the reaction rate

A

the frequency of successful collisions will decrease

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

why must titration be carried out under acidic conditions

A

to provide H+ ions for the reaction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

what are the different reduction reaction atoms to look out for when identifying them for each oxidising agent

A

tollens; look out for silver (Ag)
benedicts; look out for copper (Cu)
acidified dichromate; Cr2O7
permangenate; MnO4

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

which type of bond is broken when a protein is denatured

A

hydrogen bonds

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

what is volatility relative to

A

intermolecular attractions; the smaller the molecule the more volatile; think about the boiling point because if something is very volatile it is likely to have a very low boiling point and therefore low intermolecular attractions because not a lot of energy is needed to make it evaporate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

what must an emulsifier have

A

a hydroxyl group and a fatty acid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

what is the area under the curve of an energy distribution diagram relative to

A

the number of particles

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

what is the molecular formula for an isoprene

A

2methylbuta-1,3-diene C5H8

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

what are the factors that can affect the viscosity of alcohols

A
  • the strength of the intermolecular forces
  • the size of the molecule
  • temperature
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

if two elements share electrons equally in the bond, what does this mean?

A

they have the same electronegativity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

what method can be used to separate molecules with different boiling points

A

distillation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

why do molecules with more hydroxyl groups have more viscosity

A

they have more hydrogen bonding

16
Q

what are the different techniques you can use to separate mixtures

A
  • extraction; separates based on solubiilty
  • chromatography; separates based on polarity
  • distillation; separates based on boiling point