chemistry

Question 1

reversible reaction

Answer 1

the products react to give back the reactants

Question 2

le chatelier principle

Answer 2

if a stress is applied to a system at equilibrium the equilibrium shifts in the direction that will partially relieve the stress

Question 3

Haber process

Answer 3

is a reversible reaction where both the reactants and the product are gases

Question 4

catalyst

Answer 4

is a substance that speeds up a reaction, but is chemically unchanged by the end of the reaction

Question 5

molecular formula

Answer 5

how many of each type of atom there are in each molecule of the compound

Question 6

Empirical formula

Answer 6

shows the ratio of atoms in a compound

Question 7

kc is large (larger than 1)

Answer 7

more products favoured

Question 8

kc is small (less than 1)

Answer 8

more reactants favoured

Question 9

strong acid

Answer 9

completely dissociate into the hydronium ion in solution

Question 10

weak acid

Answer 10

partially dissociate in solution

Question 11

strong base

Answer 11

fully dissociate to give hydroxide ions in solution e.g sodium hydroxide

Question 12

weak base

Answer 12

partially dissociate e.g ammonia

Question 13

strong acids include

Answer 13

HCL, HNO3(nitric), H2SO4(sulfuric), HBr, HI, HCLO4

Question 14

weak acids include

Answer 14

HF, H3COOH(ACETIC), H3PO4(phosphoric)

Question 15

strong bases include

Answer 15

LIOH, NAOH, KOH, rbOH(rubidium), CsOH(cesium)

Question 16

weak bases include

Answer 16

NH3 ammonia

Question 17

conjugate acids and bases

Answer 17

acid changes into its conjugate base when is donates a proton. a base changes into its conjugate acid when it accepts a proton

Question 18

conjugate acid & base pair

Answer 18

any pair consisting of a acid and base that differ by one proton

Question 19

arrhenius acid

Answer 19

substance that when dissolves in water increases the concentration of H+ ions

Question 20

arrhenius base

Answer 20

substance that when dissolves in water increases concentration of OH- ions

Question 21

bronsted lowry acid

Answer 21

substance that can donate a proton to another substance

Question 22

pKa

Answer 22

indicates whether an acid is a strong or weak acid

Question 23

buffer

Answer 23

solutions that resist ph change upon the addition of a acid or base. they are able to neutralise small amounts of acid or base while maintaining the ph