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Chemistry > Chemical reactions and equations > Flashcards

Chemical reactions and equations Flashcards

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1
Q

Define chemical reaction

A

One or more substance combine to form a new substance with the different chemical composition

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2
Q

What are the criteria for chemical reaction

A

Change in colour
Change in temperature
Change in physical state
Evolution of gas
Formation of precipitate.

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3
Q

What are all the real life examples for chemical reactions

A

When milk is kept in room temperature for a long time.
When cooked food is kept in room temperature for a long time.
Digestion of food
Respiration
Fermentation of grapes
Rusting of iron when iron reacts with the humor atmosphere that is Oxygen and atmospheric moisture.

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4
Q

Copper is more reactive than iron true or false

A

False iron is more reactive than copper so iron replaces copper

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5
Q

What is the equation when iron nails are placed in copper sulphate solution

A

Cuso4 + Fe gives feso4 + CU

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6
Q

What is the colour of ferrous sulphate in the solution

A

Greenish blue

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7
Q

What is the colour of copper

A

Reddish brown

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8
Q

Other names for copper sulphate

A

Cupric sulphate,
Copper 2 sulphate

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9
Q

What is the colour of the copper sulphate solution

A

Blue

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10
Q

When silver nitrate reacts with copper it gives

A

Silver Plus copper nitrate

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11
Q

What is the colour of silver

A

Metallic shiny white

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12
Q

What is the colour of copper nitrate solution

A

Bluish green

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13
Q

What is the equation when silver nitrate reacts with copper

A

2agno3 + CU gives two a g + CU n o three twice

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14
Q

Is copper more reactive than silver or not

A

Yes copper is more reactive than silver

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15
Q

What is formed when copper reacts with silver nitrate solution

A

A black layer is found

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16
Q

What is the colour of silver nitrate solution

A

Colourless

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17
Q

What is the final product formed by lead oxide and lead four oxide

A

2pb 3 o 4

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18
Q

What is the colour of lead oxide 4

A

Red

19
Q

What is the colour of lead oxide 2

A

Yellow

20
Q

Write the decomposition reaction of copper two carbonate

A

Cu co3 gives CO2 + cuo

21
Q

What is the colour of copper2 oxide or cupric oxide

A

Black

22
Q

based on the temperature the chemical reaction can be classified

A

exothermic and endothermic

23
Q

What is exothermic reaction

A

When energy is released during a chemical reaction

24
Q

What is endothermic reaction

A

When energy is absorbed during chemical reaction

25
Q

What are the forms of energy

A

Heat light electricity or sound

26
Q

The energy of the reactant is greater than energy of the product is called

A

Exothermic

27
Q

Energy of the reactant is less than energy of the product is called

A

Endothermic

28
Q

Delta h is negative for

A

Exothermic because heat of the product minus heat of the reactant is negative

29
Q

Delta h is positive for

A

Endothermic because heat of the product minus heat of the reactant is positive

30
Q

The temperature of the surrounding in during an endothermic reaction is

A

Less

31
Q

Temperature of the surrounding is greater in

A

Exothermic

32
Q

Temperature of the container is hot in

A

Exothermic

33
Q

Temperature of the container is cold in

A

Endothermic

34
Q

What are all the examples of exothermic reaction

A

Respiration digestion combustion rusting of iron displacement reaction precipitation reaction neutralization explosion Nuclear fission condensation etc

35
Q

What are all the examples of endothermic reaction

A

Photosynthesis decomposition evaporation cooking process alkane cracking

36
Q

Give two examples for changing in physical state

A

Ammonia gas reacts with hydrogen chloride it forms ammonium chloride.
Hydrogen gas and Oxygen gas reacts to form water.

37
Q

What happens when zinc reacts with sulphuric acid or hydrochloric acid

A

Hydrogen gas will be evoluted with the sound of a pop sound

38
Q

What happens when hydrochloric acid reacts with sodium carbonate

A

There will be a brisk effervescence showing the presence of carbon dioxide evolution of carbon dioxide

39
Q

What is the precipitate formed when silver nitrate reacts with sodium chloride.

A

Silver chloride

40
Q

What is the colour of silver chloride

A

It is the white precipitate

41
Q

What is the precipitate formed when ferrous sulphate reacts with sodium hydroxide

A

Ferrous hydroxide which is dirty greenish white

42
Q

What is the colour of ferrous sulphate solution

A

Green

43
Q

Lead nitrate when reacts with potassium iodide what precipitate is formed

A

Lead iodide which is yellow precipitate.

44
Q
A

Chemistry (1 decks)

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