chemistry 2 + valancies

Question 1

acid + metal hydroxide

Answer 1

• salt + water

Question 2

acid + metal oxide

Answer 2

• salt + water

Question 3

acid + carbonate

Answer 3

• salt + water + carbon dioxide

Question 4

acid + metal

Answer 4

= salt + hydrogen gas

Question 5

acid + hydrogencarbonate

Answer 5

• salt + water + carbon dioxide

Question 6

react with water

Answer 6

K Na CA

Question 7

react with steam

Answer 7

Mg, Al, Zn, Fe, Ni, Sn, Pb

Question 8

no reaction with water or steam

Answer 8

Cu, Hg, Ag, Pt, Au

Question 9

soluble

Answer 9

no precipitation is formed

Question 10

insoluble

Answer 10

precipitation is formed

Question 11

temperature

Answer 11

• increasing the temp will increase the rate of reaction

- increases the speed of the particles therefore will collide more frequently

Question 12

concentration

Answer 12

refers to the amount of particles present
increasing concentration will increase the rate of reCtion
- more particles present - more likely to collide

Question 13

agitation

Answer 13

stirring reactants ensuring they keep in contact

Question 14

catalysts

Answer 14

• chemicals that speed up reactions but are not used up

- reduce the amount of energy required to convert reactants to products

Question 15

precipitation

Answer 15

when 2 clear solutions react to produce an insoluble solid

Question 16

ammonium

Answer 16

NH4+

Question 17

ethanoate

Answer 17

CH3COO-

Question 18

hydrogencarbonate

Answer 18

HCO3-

Question 19

hydroxide

Answer 19

OH-

Question 20

nitrate

Answer 20

NO3-

Question 21

carbonate

Answer 21

CO32-

Question 22

sul fate

Answer 22

SO42-

Question 23

sulfide

Answer 23

S2-

Question 24

phosphate

Answer 24

PO43-

Question 25

ethanoic acid

Answer 25

CH3COOH

Question 26

nitric acid.

Answer 26

HNO3

Question 27

sulfuric acid

Answer 27

H2SO4

Question 28

phosphoric acid

Answer 28

H3PO4

Question 29

hydrogen peroxide decomposition

Answer 29

h202 - h2o + o2

+ is on the other side

Question 30

fuel combustion

Answer 30

CH4 +o2 - co2 + h2o

Question 31

law of conversion of mass

Answer 31

• mass is not created or destroyed

- mass of the products must be equal to the reactants

Question 32

electroplating

Answer 32

process of costing a metal with a thin layer of another metal by electrolysis to improve the metals corrosion resistance

Question 33

reaction rate

Answer 33

determines how fast or slow the reaction is

Question 34

reaction time

Answer 34

time taken to complete a reaction to a certain extent

Question 35

surface area

Answer 35

increasing surface area there are more collisions per unit

cursing things before the experiment

Question 36

pressure

Answer 36

• increase the pressure by forcing them into a smaller space
• collide more frequently

Question 37

acid + base

Answer 37

• salt + water

Question 38

reactivity series

Answer 38

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