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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 = ______ which is
________-

A

K2O , yellow when hot white when cold

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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

17
Q

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

A

H2CO3, H2SO3, H2SO4, H3PO4

18
Q

what is a decomposition reaction

A

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

19
Q

oxides of ___ and ___ are stable to heat

A

k and Na

20
Q

Pb3O4 decomposes into ______ + ________

A

PbO + O2

21
Q
A
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.

23
Q

Define a direct combination reaction.

A

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

24
Q

What occurs during a decomposition reaction?

A

A chemical compound decomposes into two or more simpler substances.

25
Q

What is a displacement reaction?

A

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

26
Q

Describe a double decomposition reaction.

A

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

27
Q

What is a thermal decomposition reaction?

A

A decomposition reaction that is brought about by heat.

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.

29
Q

True or False: Thermal dissociation is a reversible reaction.

A

True.

30
Q

What causes electrolytic decomposition?

A

The passage of electric current.

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.

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.

A

promoter.

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.

Chemistry (9 decks)

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