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Chemistry 9 icse > Chapter 2 Chemical Reactions > Flashcards

Chapter 2 Chemical Reactions Flashcards

Types of reactions and energy changes

1
Q

define chemical reaction

A

It is a chemical change , in which matter changes into a new substance or substances

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2
Q

What happens during a chemical reaction?

A

The existing bonds in reactants are broken and new bonds are formed resulting in formation of new substances called products

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3
Q

define chemical bond.

A

The linkage or force which acts between two atoms to hold them together as a stable molecule is called a chemical bond

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4
Q

A chemical reaction is represented by

A

a chemical equation

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5
Q

define synthesis or direct combination reaction

A

A chemical reaction in which 2 or more elements or compounds react to form - one new compound

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6
Q

Name the acid produced when SO2 reacts with H2O

A

Sulphurous acid H2SO3

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7
Q

WHAT IS THE NAME OF THE PROCESS TO MANUFACTURE AMMONIA

A

HABER’S PROCESS

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8
Q

SULPHURIC ACID IS OBTAINED WHEN ______ GAS REACTS WITH H2O.

A

SO3

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9
Q

DEFINE DECOMPOSITION REACTION

A

A decomposition reaction can be defined as a chemical reaction in which one reactant breaks down into two or more products

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10
Q

WHICH SUBSTANCE ACTS AS CATALYST IN SYNTHESIS OF HCl FROM H2 AND Cl2 AND WHATS SHOULD BE THE CONDITION?

A

MOISTURE AND DIFFUSED SUNLIGHT

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11
Q

WHICH IS USED AS CATALYST IN HABER’S PROCESS?

A

FINELY DIVIDED Fe

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12
Q

Metal nitride+warm water–>Metal hydroxide + _______

hint: its a basic gas

A

Ammonia

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13
Q

Name the Metallic oxide and non-metallic oxide used in the formation of CaCO3

A

CaO+CO2

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14
Q

Oxides of K to Cu are stable to heat.

What are the products obtained when HgO undergoes thermal decomposition?

A

Hg + O2

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15
Q

Hydroxides of K and Na are stable to heat. Hydroxides of Ca to Cu on thermal decomposition will yield respective

A

metal oxide and water

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16
Q

Carbonates of K and Na are stable to heat. What are the products formed when carbonates of Ca to Cu undergo thermal decomposition?

A

metal oxide and CO2

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17
Q

What are the products formed when carbonates of Hg and Ag undergo thermal decomposition?

A

Respective metal + CO2 +O2

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18
Q

What are the products formed when nitrates of Ca to Cu undergo thermal decomposition?

A

respective matl oxide + NO2 + O2

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19
Q

What are the products formed when nitrates of K,Na undergo thermal decomposition?

A

Respective metal nitrite and O2

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20
Q

What are the products formed when nitrates of Hg/Ag undergo thermal decomposition?

A

Hg/Ag + NO2 +O2

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21
Q

Define displacement reaction

A

A displacement reaction is the one wherein the atom or a set of atoms is displaced by another atom in a molecule

22
Q

Name the colour of the residue formed and the gas produced when Ammonium dichromate decomposes.

A

Green residue and Nitrogen gas

23
Q

Name the gases produced and their nature, when AMMONIUM CHLORIDE dissociates

A

NH3- Ammonia- basic

HCl- Hydrogen chloride- acidic

24
Q

Thermal dissociation is unlike Thermal decomposition is a

A

reversible reaction

25
Q

Name two compounds which will undergo PHOTOCHEMICAL DECOMPOSITION

A

AgCl- Silver(I) chloride

H2O2 - Hydrogen peroxide

26
Q

Define double decomposition reaction

A

A double decomposition reaction is a type of decomposition reaction in which two constituent reactants interchange positive and negative ions and form two new compounds

27
Q

Which of these cannot displace Cu from CuSO4?

Mg, Al, Hg, Zn, Fe, Ag

28
Q

Highly reactive HALOGEN

29
Q

Least reactive HALOGEN

30
Q

Name the HALOGENS which can displce Br from KBr solution

31
Q

How do you identify Fe+2 and Fe+3 radicals?

A

By using NaOH.

Fe+2 will give dirty green ppt of Fe(OH)2 while Fe+3 will give Reddish brown ppt of Fe(OH)3

32
Q

Name the colour of Copper(II) hydroxide ppt

33
Q

Name the colour of Copper(II) hydroxide ppt

34
Q

Name the colour of Zinc hydroxide ppt

A

Gelatinous white

35
Q

Name the colour of Copper(II) hydroxide ppt

36
Q

Name the colour of Lead(II) hydroxide ppt

A

Chalky white

37
Q

define precipitate

A

A precipitate is an insoluble solid that emerges from a liquid solution during a chemical reaction

38
Q

Acid + Base –>

A

Salt + water

39
Q

Neutralization is a type of ________________________ reaction just like precipitation reaction.

A

Double decomposition

40
Q

Acid is the substance that yields ______ ion in water

A

H+ or H3O+

41
Q

Base is either Metal oxide or

A

Metal hydroxide

42
Q

Define Neutralization reaction

A

A neutralization reaction is when an acid and a base react to form water and salt and involves the combination of hydrogen ions and hydroxyl ions to generate water

43
Q

_________+_________—> NH4Cl+ H2O

A

NH4OH + HCl

44
Q

Which substabce at home can be used to nullify the effect of a sting of a bee?

A

Baking soda or Sodium bicarbonate

45
Q

Which substabce at home can be used to nullify the effect of a sting of a wasp?

46
Q

+∆T on product side indicates that the reaction is _________ in nature

A

Exothermic

47
Q

-∆T on product side indicates that the reaction is _________ in nature

A

Endothermic

48
Q

Silver nitrate solution is kept in coloured bottles in the laboratory. Give reason

A

In the presence of light silver nitrate decompose to form silver. hence to prevent the decomposition it is kept in dark coloured bottles

49
Q

What is the role of a promoter?

A

It improves the efficiency of a catalyst

50
Q

Name the propoter used in Haber’s process i.e. in the manufacture of ammonia by hydrogen and nitrogen

A

Molybdenum (Mo)

51
Q

Solution of slaked lime is used for white washing. Give reason

A

When a solution of slaked lime is applied to the walls, calcium hydroxide reacts slowly with Carbon dioxide present in the atmosphereto form a thin layer of shiny Calciu carbonate on the walls.

52
Q

Colourless conc. Sulphuric acid in a test tube changes to blue on adding a small piece of Copper to it. Why?

A

Due to the formation of Blue solution of Copper sulphate

Explanation:
Copper cannot diplace hydrogen from dilute H2SO. But When copper reacts with concentrated sulphuric acid sulphur dioxide is produced by the reduction of H2SO4
The copper (II) ions are formed in the aqueous solution.
The redox reaction, Cu+2H2SO4→CuSO4+SO2+2H2O

Chemistry 9 icse (7 decks)

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