chemical reactions and equations

Question 1

chemical reaction

Answer 1

a new substance is formed or a chemical reaction takes place

Question 2

chemical equations

Answer 2

symbolic representation of reactions

Question 3

catalyst

Answer 3

substance which increases the rate of chemical reaction without actually participating in it

Question 4

synthesis reaction

Answer 4

combination reaction

Question 5

quick lime

Answer 5

CaO

Question 6

slaked lime or lime water

Answer 6

Ca(OH)2

Question 7

lime stone, white ppt.

Answer 7

CaCO3

Question 8

calcium hydroxide reacts with ________ to form __________

Answer 8

Carbon dioxide & lime stone

Question 9

formation of __________ gives a shiny finish to walls

Answer 9

lime stone/calcium carbonate/marble

Question 10

reaction of quick lime with water is a highly ____________ reaction

Answer 10

exothermic

Question 11

combination reactions are mostly

Answer 11

exothermic

Question 12

decomposition reactions are mostly

Answer 12

endothermic

Question 13

blue vitriol

Answer 13

CuSO4.5H2O, copper sulphate

Question 14

green vitriol

Answer 14

FeSO4.7H2O, ferrous sulphate

Question 15

SO2 has _________ (indicator)

Answer 15

pungent smell

Question 16

**pale yellow ppt.

Answer 16

lead iodide

Question 17

lead iodide is formed in __________ (reaction)

Answer 17

KI & Pb(NO3)2

Question 18

Cl2 has ___________

Answer 18

strong smell as an indicator

Question 19

chlorine colour

Answer 19

greenish yellow

Question 20

nitrogen oxide

Answer 20

brown fumes

Question 21

bromine

Answer 21

reddish brown fumes

Question 22

**CuO

Answer 22

black

Question 23

**CuS

Answer 23

black ppt

Question 24

CuSO4

Answer 24

white

Question 25

CuCl2

Answer 25

green

Question 26

Cu(NO3)2

Answer 26

bluish green

Question 27

CuSO4.5H2O

Answer 27

Blue

Question 28

Fe2O3

Answer 28

rust/brown

Question 29

FeSO4

Answer 29

Green ppt.

Question 30

**AgBr

Answer 30

yellow ppt.

Question 31

AgCl

Answer 31

white ppt.

Question 32

displacement reaction is also known as

Answer 32

precipitation reaction

Question 33

BaSO4

Answer 33

white ppt.

Question 34

oxygen is _____ when oxidation occurs

Answer 34

added

Question 35

hydrogen is ______ in oxidation

Answer 35

removed

Question 36

electrons are _______ in oxidation

Answer 36

lost

Question 37

oxygen is ____________ in reduction

Answer 37

removed

Question 38

Hydrogen is _________ in reduction

Answer 38

added