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Chemistry > Chemical Reactions > Flashcards

Chemical Reactions Flashcards

1
Q

what is a chemical reaction?

A

it is a chemical change in which matter changes into a new substance

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2
Q

what happens when mercury oxide is heated

A

mercury oxide (hgo) which is an orangish red substance when heated becomes mercury which is a silvery substance

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3
Q

Which gas evolves when Zn reacts with HCL (dil)

A

hydrogen

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4
Q

what is an exothermic reactionz? give eg

A

exothermic reactions proceed with the evolution of heat

Cao + H2O ——> Ca(OH)2

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5
Q

what is endothermic reaction

A

endothermic reactions proceed with the absorbtion of heat

N2 + O2 = NO

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6
Q

name the product formed in silver nitrate reacts with hydrochloric acid

A

nitric acid (HNO3) and
AgCl as a precipitate which is a curdy white substance

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7
Q

what is synthesis reaction?

A

it is a reaction in which two or more elements or compounds react to form a new element or compound

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8
Q

metal + oxygen forms _______

A

metallic oxide

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9
Q

K + O2 = ______

A

K2O

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10
Q

Fe + O2= _____ which is _____

A

Fe2O3 , rust

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11
Q

Cuo is a __________ powder

A

black, solid

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12
Q

SO2 is a ________ gas

A

toxic

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13
Q

P + O2=______ which is a _________ solid

A

P2O5, white crystalline

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14
Q

h2 is cl2 = _____. (GR)
is is not a photochemical reaction

A

photochemical reactions only occur in the presence of sunlight. this reactions occurs in the presence of diffused sunlight which is why it isnt a photo chemical reaction

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15
Q

cucl is ____ in colour

A

blue

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16
Q

caustic soda , caustic potash and slaked lime formulae

A

NAOH, KOH, Ca(OH)2

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17
Q

Formulae of carbonic acid, sulphurous acid , sulphuric acid, phospuric acid

A

H2CO3, H2SO3, H2SO4, H3PO4

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18
Q

what is a decomposition reaction

A

it is a reaction in which two chemical compounds decompose into simpler substances

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19
Q

oxides of ___ and ___ are stable to heat

A

k and Na

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20
Q

Pb3O4 decomposes into ______ + ________

A

PbO + O2

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21
Q
A
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22
Q

What is a chemical reaction?

A

A chemical change in which matter changes into a new substance or substances, often accompanied by external indications or characteristics.

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23
Q

Define a direct combination reaction.

A

A reaction in which two or more elements or compounds combine to give one new compound.

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24
Q

What occurs during a decomposition reaction?

A

A chemical compound decomposes into two or more simpler substances.

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25
Q

What is a displacement reaction?

A

A reaction in which one element displaces another element from its compound.

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26
Q

Describe a double decomposition reaction.

A

A reaction in which both reactants are decomposed by exchanging their radicals to give new compounds.

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27
Q

What is a thermal decomposition reaction?

A

A decomposition reaction that is brought about by heat.

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28
Q

Fill in the blank: Thermal dissociation is a decomposition reaction in which a substance dissociates into _______ on application of heat.

A

two or more simpler substances.

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29
Q

True or False: Thermal dissociation is a reversible reaction.

A

True.

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30
Q

What causes electrolytic decomposition?

A

The passage of electric current.

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31
Q

Define a neutralization reaction.

A

A reaction between a base and an acid to give two new compounds: salt and water, by interchange of radicals.

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32
Q

What is a precipitation reaction?

A

A reaction between two compounds in an aqueous solution state to give two new compounds, one of which is insoluble and called precipitate.

33
Q

What is an activity series of metals?

A

A series of arrangement of metals in order of their reactivity, with the most active metal at the top and the least active at the bottom.

34
Q

What are reversible reactions?

A

Chemical reactions in which the products formed react together to form the original reactants, depending on the conditions of the reaction.

35
Q

What are catalytic reactions?

A

Chemical reactions in which a catalyst is used to alter the rate of the reaction without taking part in it.

36
Q

Fill in the blank: A _______ is a substance added to a catalyst to increase its efficiency.

37
Q

What are exothermic reactions?

A

Chemical reactions that proceed with the evolution of heat energy.

38
Q

What are endothermic reactions?

A

Chemical reactions that proceed with the absorption of heat energy.

39
Q

Define oxides.

A

Binary compounds of a metallic or nonmetallic element with oxygen.

40
Q

formula of potassium and oxygen

A

k + O2 = K2O

41
Q

Formula of zinc and oxygen

A

Zn + O2= ZnO ( yellow when hot, white when cold)

42
Q

formula of Fe and O2

A

Fe+ O2 = Fe2O3 (rust)

43
Q

Cu+ O2=

A

CuO (black solid powde)

44
Q

S + O2

A

SO2 (toxic gas)

45
Q

formula of hcl

A

cl2 + H2 = HCl

46
Q

Fe + Cl2= ______ which is ______

A

Fecl3 brown scales

47
Q

Cu + Cl2= ___ which is ______

A

Cucl2,blue

48
Q

Fe + S=_______

A

Fes ( black)

49
Q

Ag + S =________

A

AgS( Black)

50
Q

reactions from K to Cu oxides on heating

A

they are stable to heat

51
Q

reaction of oxides Ag and Hg on heating

A

they decompose to give their metal + oxygen

52
Q

reaction of carbonates K and Na on heating

A

they are stable to heat

53
Q

reaction of carbonates Ca to cu on heating

A

they decompose to give their metallic oxide and carbon dioxide

54
Q

reaction of carbonates Hg and Ag

A

they decompose to give their metal carbon dioxide and oxygen

55
Q

Al2(CO)3 on heating becomes

A

Al2O3 + CO2

56
Q

reaction of hydroxides K and Na

A

they are stable to heat

57
Q

KOH on heating becomes

58
Q

reaction of hydroxides from Ca to Cu

A

they decompose to form metallic oxides and water

59
Q

Zn(OH)2=

60
Q

Al(OH) 3 =

A

Al2O3 +H2O

61
Q

reaction of hydroxides OF Ag and Hg

A

they decompose to give their metal oxygen and water

62
Q

Hg(OH)2 =

A

Hg + O2+ H2O

63
Q

reaction of nitrates of K and Na on heating

A

they slowly decompose to give metallic nitrate oxygen

64
Q

reaction of nitrates of ca to Cu on heating

A

they decompose to give metallic oxide nitrogen dioxide and oxygen

65
Q

Cu(NO3) 2 =

A

CuO + NO2 + O2

66
Q

reaction of nitrates of Hg and Ag on heating

A

they decompose to form metal oxygen nitrogen dioxide

67
Q

Reactions of potassium sodium and calcium on displacing hydrogen

A

they displace hyfrogen from cold water

68
Q

Reactions of Mg, Al , Zn and Fe on displacing hydrogen

A

they displace hydrogen to from corresponding oxides and liberate hydrogen

69
Q

Fe + H2O=

70
Q

Reactions on metals below hydrogen displacing hydrogen from acids

A

it does ot displsce hydrogen below acids

71
Q

_______ can liberate oxygen from ______ water

A

magnesium, boiling

72
Q

Reactions of lead and metals below H on displacing hydrogen from water and steam

A

they do not react with hydrogen

73
Q

Reactions of potassium sodium and calcium on displacing hydrogen from acids

A

they displace hydrogen from cold dilute acids violently with an explosion

74
Q

Reactions of on Mg, Al, Zn displacing hydrogen from acids

A

they displace hydrogen from cold dilute acids without a violent explosion

75
Q

Reactions of iron on displacing hydrogen from acids

A

it displaces hydrogen from cold dilute acids slowly and quietely

76
Q

Reactions of lead on displacing hydrogen from acids

A

it displaces hydrogen from hot concentrated acis

Chemistry (10 decks)

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