SAC 1

Question 1

Accuracy

Answer 1

how close measured values are to their true

value

Question 2

Activation energy

Answer 2

minimum amount of energy required for

a reaction to proceed

Question 3

Aliquot

Answer 3

portion of sample solution that is to be analysed

during titration

Question 4

burette:

Answer 4

a graduated glass tube for delivering known volumes of a liquid, especially in titrations

Question 5

Complete combustion

Answer 5

reaction of a substance with oxygen

to produce carbon dioxide and water

Question 6

Concordant titres

Answer 6

volume of three or more titres that fall

within approximately 0.1 mL of each other

Question 7

Condensation reaction

Answer 7

chemical reaction where two

molecules combine with the release of a water molecule

Question 8

dipole-dipole interaction

Answer 8

Difference in electronegativity between covalently bonded atoms results in polar bonds.
This results in a bond that is a dipole; the presence of two poles where one is partially
positive and the other partially negative. The oppositely charged poles of different
molecules can be attracted to each other, resulting in a dipole-dipole interaction

Question 9

dispersion force

Question 10

Electrolyte

Answer 10

chemical compound that allows the flow of

electric charge within a cell

Question 11

Endpoint

Answer 11

point at which a colour change occurs during a

titration

Question 12

Endothermic

Answer 12

chemical reaction which absorbs energy (in
the form of heat) from the surrounding environment p. 64
Endpoint point at which a colour change occurs during a
titration

Question 13

Exothermic

Answer 13

Exothermic chemical reaction accompanied by the release
of energy (in the form of heat)

Question 14

Flash point

Answer 14

lowest temperature at which an organic

compound gives off sufficient vapour to ignite in air

Question 15

half equation

Question 16

hydrogen bond

Question 17

Hydrolysis

Answer 17

chemical reaction where water is used to break

the bonds of a substance

Question 18

Ion-dipole interactions

Question 19

Isomers

Answer 19

molecules with the same molecular formula but

different structures

Question 20

Metabolism

Answer 20

breakdown of food and its transformation into

energy

Question 21

Miscible

Question 22

Non-renewable resource

Answer 22

resource that cannot be

replenished as quickly as it is being consumed

Question 23

Oxidising agent

Answer 23

species that oxidises another substance

and is itself reduced

Question 24

Oxidation

Answer 24

chemical reaction where a species increases its

oxidation number by losing electrons

Question 25

Oxidation number

Answer 25

number assigned to an element, representing the number of electrons lost or gained by an atom of that element to form a chemical bond with another species

Question 26

Oxidised

Answer 26

an increase in the oxidation number; a loss of electrons

Question 27

Pipette

Answer 27

a slender tube for transferring or measuring small quantities of liquid

Question 28

Precision

Answer 28

how close measured values are to each other

Question 29

Rate of reaction

Question 30

Reducing agent

Answer 30

species that reduces another substance | and is itself oxidised

Question 31

Reduction

Answer 31

n chemical reaction where a species decreases its | oxidation number by gaining electrons

Question 32

Reliability

Answer 32

experiment is able to produce consistent results | even in varying conditions

Question 33

Reduced

Answer 33

a decrease in the oxidation number; a gain of electrons

Question 34

Renewable resource

Answer 34

resource capable of being replenished by natural processes as quickly or faster than it is being consumed

Question 35

Repeatability

Answer 35

closeness of results obtained using the same | method, materials and under the same conditions

Question 36

Reproducibility

Answer 36

closeness of results from repeated experiments using the same method under different conditions

Question 37

Saturated hydrocarbons

Answer 37

molecules that have only single | carbon-carbon bonds

Question 38

Specific heat capacity

Answer 38

heat required to raise the | temperature of 1 gram of a given substance by 1 °C

Question 39

Sustainability

Answer 39

energy that meets present needs without compromising the ability of future generations to meet their own needs

Question 40

Thermochemical equation

Answer 40

balanced stoichiometric equation that includes the enthalpy change, ΔH, of the reaction

Question 41

Unsaturated hydrocarbons

Answer 41

molecules that have at least one | double or triple carbon-carbon bond

Question 42

Random error

Answer 42

error in measurement that differs in amount / proportion each time experiment is conducted and is usually a ‘one-off’ error

Question 43

Validity

Answer 43

 whether or not the experiment (and its components) is suitable to address the aim and hypothesis of the research

Question 44

Systematic error 

Answer 44

error in measurement by the same amount / proportion in the same direction every time which also includes errors that are inherent in the experiment.

Question 45

• Enthalpy 

Answer 45

measurement of the internal energy of a system

Question 46

• Incomplete combustion

Answer 46

partial burning of a substance to produce carbon monoxide | (or solid carbon) and water