Key Skills And Core Knowledge

Question 1

Standard lab conditions (SLC)

Answer 1

Temperature considered as normal room temperature 25 degrees or 298k
Pressure @SLC is 100kPa

Question 2

To convert from mmHg -> kPa

Answer 2

(Pressure/750)x 100

Question 3

To convert from kPa ->mmHg

Answer 3

(Pressure /100)x 750

Question 4

To convert from atm ->kPa

Answer 4

(Pressure/0.987)x q00

Question 5

To convert from kPa -> atm

Answer 5

(Pressure/100)x0.987)

Question 6

Molar volume formula and it’s use

Answer 6

n=V/Vm at SLC

Question 7

Universal gas equation

Answer 7

PV=nrt
R =universal gas constant of 8.31j/k/mol
P = kilopascal (kPa) V= litres temperature = kelvin (+273 to Celsius) quantity of gas = moles

Question 8

Aim

Answer 8

Purpose /objective of an experiment

Question 9

Independent variable

Answer 9

Variable that is deliberately manipulated or changed by the experimenter to find the effect on the dependent variable

Question 10

Dependent variable

Answer 10

The variable that is measured by the experimenter

Question 11

Controlled variable

Answer 11

Variable(s) held constant throughout the experiment

Question 12

Hypothesis

Answer 12

Statement that predicts the outcome of the experiment/investigation

Question 13

Qualitative analysis

Answer 13

Technique that determines the composition of the sample - what’s in it

Question 14

Qualitative data

Answer 14

Non- numerical (descriptive) data collected based on observation taken during an experiment

Question 15

Quantitative data

Answer 15

Data which provides a numerical value

Question 16

Quantitative analysis

Answer 16

Technique that identifies the amount of substance present

Question 17

Quantitative technique (Electrolytic cell):- purpose

Answer 17

To predict the amount of reactant used or mass of product formed

Question 18

Example of quantitative data derived from electrolytic cells

Answer 18

The time , voltage and /or current at which electricity is passed through cell

Question 19

Quantitative technique HPLC (high performance liquid chromatography);- purpose

Answer 19

To identify properties and the identity of the components in a sample

Question 20

Example of quantitative data derived from HPLC

Answer 20

The retention time of different components in a sample

Question 21

Quantitative technique (Volumetric analysis/titrations) ;- purpose

Answer 21

To determine the concentration /amount of an unknown compound

Question 22

Example of quantitative data derived from Titration

Answer 22

The volume of the titrant used in the experiment

Question 23

Quantitative technique (calorimetry) :- purpose

Answer 23

To determine the enthalpy (delta H) of a reaction

Question 24

Example of quantitative data derived from calorimetry

Answer 24

The temperature change as a result of a reaction

Question 25

Name the Quantitative techniques

Answer 25

Electrolytic cells
HPLC (high performance liquid chromatography)
Volumetric analysis (titrations)
Calorimetry