chemistry in society

Question 1

feedstock

Answer 1

a reactant from which other chemicals can be extracted or synthesised

Question 2

raw materials

Answer 2

what feedstocks are derived from

Question 3

atom economy

Answer 3

the mass of the product you want as a percentage of the mass of the reactants used in the reaction

Question 4

percentage yield

Answer 4

the mass of the product actually made compared to the mass of the product it is theoretically possible to make.

Question 5

what is molar volume

Answer 5

volume of one mole of gas

Question 6

what do particles require for reaction to occur

Answer 6

correct collision geometry and activation energy

Question 7

colour change for starch indicator

Answer 7

colourless- blue black

Question 8

the products in endothermic reactions have…. energy than the reactants

Answer 8

more

Question 9

the products in exothermic reactions have…. energy than the reactnats

Answer 9

less

Question 10

exothermic reactions …… heat to surroundings

Answer 10

loses

Question 11

endothermic reaction…… heat form surroundings

Answer 11

absorbs

Question 12

what is temperature

Answer 12

measure of the average kinetic energy of the particles in a chemical.

Question 13

problems with a copper cup alcohol burning set up

Answer 13

evaporation of alcohol
heat lost to surroundings
non uniform distribution of heat
incomplete combustion

Question 14

molar volume equation

Answer 14

V = N x Mv

Question 15

enthalpy of combustion equations

Answer 15

Eh=CMΔT
Eh= ΔH x N

Question 16

bond enthalpy

Answer 16

the energy needed to break on mole of bonds in a mole of gaseous molecules

Question 17

hess’s law

Answer 17

the enthalpy change for any reaction is independent of the route,
provided the starting conditions and final conditions are the same

Question 18

equillibrium

Answer 18

the point in a reversible system when the rate of the forward reaction equals the rate of the backwards reaction

Question 19

le Chateliers principle

Answer 19

the position of the equilibrium in a chemical reaction will change to minimise the effect of any imposed change in the reaction

Question 20

increase temperature

Answer 20

shifts to endothermic side

Question 21

decrease temperature

Answer 21

shifts to exothermic side

Question 22

add reactant or remove product

Answer 22

shift to the right

Question 23

remove reactant add product

Answer 23

shit to left

Question 24

increase pressure

Answer 24

shifts to reduce moles

Question 25

decrease pressure

Answer 25

shifts to increase moles

Question 26

if ΔH is negative the reaction is

Answer 26

exothermic

Question 27

if ΔH is positive the reaction is

Answer 27

endothermic

Question 28

retention factor

Answer 28

the distance travelled by the dot divided by the distance travelled by solvent front.

Question 29

small polar molcules travel

Answer 29

further and faster