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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
What is a displacement reaction?
A reaction in which one element displaces another element from its compound.
26
Describe a double decomposition reaction.
A reaction in which both reactants are decomposed by exchanging their radicals to give new compounds.
27
What is a thermal decomposition reaction?
A decomposition reaction that is brought about by heat.
28
Fill in the blank: Thermal dissociation is a decomposition reaction in which a substance dissociates into _______ on application of heat.
two or more simpler substances.
29
True or False: Thermal dissociation is a reversible reaction.
True.
30
What causes electrolytic decomposition?
The passage of electric current.
31
Define a neutralization reaction.
A reaction between a base and an acid to give two new compounds: salt and water, by interchange of radicals.
32
What is a precipitation reaction?
A reaction between two compounds in an aqueous solution state to give two new compounds, one of which is insoluble and called precipitate.
33
What is an activity series of metals?
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
What are reversible reactions?
Chemical reactions in which the products formed react together to form the original reactants, depending on the conditions of the reaction.
35
What are catalytic reactions?
Chemical reactions in which a catalyst is used to alter the rate of the reaction without taking part in it.
36
Fill in the blank: A _______ is a substance added to a catalyst to increase its efficiency.
promoter.
37
What are exothermic reactions?
Chemical reactions that proceed with the evolution of heat energy.
38
What are endothermic reactions?
Chemical reactions that proceed with the absorption of heat energy.
39
Define oxides.
Binary compounds of a metallic or nonmetallic element with oxygen.
40
formula of potassium and oxygen
k + O2 = K2O
41
Formula of zinc and oxygen
Zn + O2= ZnO ( yellow when hot, white when cold)
42
formula of Fe and O2
Fe+ O2 = Fe2O3 (rust)
43
Cu+ O2=
CuO (black solid powde)
44
S + O2
SO2 (toxic gas)
45
formula of hcl
cl2 + H2 = HCl
46
Fe + Cl2= ______ which is ______
Fecl3 brown scales
47
Cu + Cl2= ___ which is ______
Cucl2,blue
48
Fe + S=_______
Fes ( black)
49
Ag + S =________
AgS( Black)
50
reactions from K to Cu oxides on heating
they are stable to heat
51
reaction of oxides Ag and Hg on heating
they decompose to give their metal + oxygen
52
reaction of carbonates K and Na on heating
they are stable to heat
53
reaction of carbonates Ca to cu on heating
they decompose to give their metallic oxide and carbon dioxide
54
reaction of carbonates Hg and Ag
they decompose to give their metal carbon dioxide and oxygen
55
Al2(CO)3 on heating becomes
Al2O3 + CO2
56
reaction of hydroxides K and Na
they are stable to heat
57
KOH on heating becomes
KOH
58
reaction of hydroxides from Ca to Cu
they decompose to form metallic oxides and water
59
Zn(OH)2=
ZnO + H2O
60
Al(OH) 3 =
Al2O3 +H2O
61
reaction of hydroxides OF Ag and Hg
they decompose to give their metal oxygen and water
62
Hg(OH)2 =
Hg + O2+ H2O
63
reaction of nitrates of K and Na on heating
they slowly decompose to give metallic nitrate oxygen
64
reaction of nitrates of ca to Cu on heating
they decompose to give metallic oxide nitrogen dioxide and oxygen
65
Cu(NO3) 2 =
CuO + NO2 + O2
66
reaction of nitrates of Hg and Ag on heating
they decompose to form metal oxygen nitrogen dioxide
67
Reactions of potassium sodium and calcium on displacing hydrogen
they displace hyfrogen from cold water
68
Reactions of Mg, Al , Zn and Fe on displacing hydrogen
they displace hydrogen to from corresponding oxides and liberate hydrogen
69
Fe + H2O=
Fe3O4
70
Reactions on metals below hydrogen displacing hydrogen from acids
it does ot displsce hydrogen below acids
71
_______ can liberate oxygen from ______ water
magnesium, boiling
72
Reactions of lead and metals below H on displacing hydrogen from water and steam
they do not react with hydrogen
73
Reactions of potassium sodium and calcium on displacing hydrogen from acids
they displace hydrogen from cold dilute acids violently with an explosion
74
Reactions of on Mg, Al, Zn displacing hydrogen from acids
they displace hydrogen from cold dilute acids without a violent explosion
75
Reactions of iron on displacing hydrogen from acids
it displaces hydrogen from cold dilute acids slowly and quietely
76
Reactions of lead on displacing hydrogen from acids
it displaces hydrogen from hot concentrated acis
77
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Chemistry (10 decks)

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