Chemistry

Question 1

Accuracy

Answer 1

The proximity of answers to the true value

Question 2

Activation Energy (AE)

Answer 2

The energy required for a reaction to occur

Question 3

Aliquot

Answer 3

a portion of a larger whole

Question 4

Burette

Answer 4

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

Question 5

Combustion

Answer 5

exothermic reactions in which the reactant combines with oxygen to produce an oxide.

Question 6

Concordant titres

Answer 6

Concordant titres- are those in a specified range eg. +/- 0.1ml of each other

Question 7

Condensation reaction

Answer 7

A chemical reaction where two molecules react to form one molecule and water

Question 8

Dipole Dipole Interaction

Answer 8

Forces of Attraction between the positive end of one molecule and the negative end of another molecule

Question 9

Dispersion

Answer 9

Weakest bonds, formed between polar molecules1

Question 10

Electrolyte

Answer 10

Minerals that can carry an electric charge

Question 11

End Point

Question 12

Endothermic

Answer 12

Reaction that joins molecules together by absorbing energy from the environment

Question 13

Exothermic

Answer 13

Chemical reactions that break molecules apart and release energy

Question 14

Flashpoint

Answer 14

The flashpoint of a liquid is the lowest temperature at which it will produce a vapour that will ignite to produce a flame when an ignition source is supplied.

Question 15

Half equation

Answer 15

equation used to show the transfer of electrons in a reaction
e.g H+ + e- -> H

Question 16

Hydrogen Bond

Answer 16

Hydrogens form groups between molecules with N F and O molecules, Strongest form of attraction

Question 17

Hydrolysis reaction

Answer 17

A hydrolytic reaction involves the reaction of water with a compound to produce two or more molecules smaller than the original compound.

Question 18

Ion-Dipole interaction

Answer 18

Attractive force when an ion encounters a polar molecule

Question 19

Isomers

Answer 19

Isomers are molecules that contain the same number and type of atoms, arranged in different ways

Question 20

Metabolism

Answer 20

the complete total of all reactions occurring in an organism

Question 21

Non-renewables

Answer 21

Non-renewable- resources are those that are used at a rate faster than they can be replaced

Question 22

Oxidant

Answer 22

a molecule that oxidises the reactant in a redox reaction

Question 23

Oxidation

Answer 23

The Loss of electrons

Question 24

Oxidation number

Answer 24

Oxidation is an increase in the oxidation number of an atom

Question 25

Oxidised

Answer 25

the process of losing electrons in a redox reaction

Question 26

Pipette

Answer 26

WIP

Question 27

Precision

Answer 27

Experimental precision refers to how closely two or more measurement values agree with each other

Question 28

Rate of Reaction

Answer 28

The Rate of Successful collision within a specific time frame

Question 29

Reductant

Answer 29

Molecule that reduces the Oxidant in a redox equation

Question 30

Reduced

Answer 30

The gain of electrons

Question 31

Reduction

Answer 31

the process of adding electrons to a reactant in a redox equation

Question 32

Reliability

Answer 32

WIP

Question 33

Renewable Energy

Answer 33

Energy that is naturally replenished on a human timescale

Question 34

Saturated

Answer 34

Unable to form any more bonds

Question 35

Unsaturated

Answer 35

Able to form bonds with more molecules ( possesses a double bond)

Question 36

Sustainable

Answer 36

energy that is derived from sources that are not expected to run out within the lifetime of the human race and causes no damage to the environment.

Question 37

Thermochemical equation

Answer 37

A Thermochemical Equation is a balanced stoichiometric chemical equation that includes the. enthalpy change, ΔH

Question 38

Validity

Answer 38

A measurement is ‘valid’ if it measures what it claims to be measuring.