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University of Success School > BYJUS SCIENCE GRADE 7 CHEMISTRY > Flashcards

BYJUS SCIENCE GRADE 7 CHEMISTRY Flashcards

1
Q

When does a reaction occur

A

When chemicals come together a reaction occurs

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2
Q

The chemicals that participate is a reaction are called

A

REACTANTS

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3
Q

The final outcome of a reaction is a

A

PRODUCT

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4
Q

What is a catalyst

A

The stuff that helps the chemical change and speeds up the reaction

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5
Q

The original colour of the Statue of Liberty was

A

Brown

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6
Q

The present colour of the Statue of Liberty is

A

Green

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7
Q

Why has the colour of the statue of the Statue of Liberty changed from Brown to Green

A

Because of Acid Base reactions

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8
Q

Why has the colour of the Taj mahal changed from the original White to the present Cream

A

The TM is made up of chemicals that conatins a base and when it reacts with rain that is mildly acidic it changes colour

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9
Q

Lemons are an alkali
True or false

A

False
Lemons are acidic

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10
Q

Soap has a base
True or False

A

True

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11
Q

When a substance has more of an acid it is known as

A

Acidic

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12
Q

Everything that alkaline is a base
True or False

A

True

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13
Q

Everything that a base is alkaline
True or False

A

False

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14
Q

Are Amino acids actually acids

A

No. Even though it contains the word acid it has an acidic part and a basic part.

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15
Q

Most chemical processes in a living organisms occur as acid base reactions.
True or False

A

True

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16
Q

The basic unit of Proteins is

A

Amino Acids

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17
Q

The basic unit of fats is

A

Fatty acids

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18
Q

How is wine made

A

Fermentation of fruits

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19
Q

The most common acids outside the human body and industrially made are

A
  1. Hydrochloric acid HCl
  2. Sulphuric Acid
  3. Nitric acid
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20
Q

In ancient times all sour substances was considered to be

A

Acids

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21
Q

What is the common name of Table salt aka common salt

A

Sodium Chloride Nacl

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22
Q

What are vegetable dyes

A

Coloured extracts of certain plants

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23
Q

Name two Natural acids

A

Citric acid
acetic acid

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24
Q

What is Aqua Regia

A

It is a mixture of Hydrochloric acid and Nitric acid

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25
Q

What is the importance of Aqua Regia

A

It can dissolve gold

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26
Q

Bases help to Neutralize acids
True or False

A

True

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27
Q

Acids have a corrosive property
True or False

A

True

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28
Q

From where is the world Alkali derived

A

From the Arabic word Al-qualiy which means ashes

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29
Q

What is an alkali

A

Its a Base that can be dissolved in water

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30
Q

Who is an Alchemist

A

A person who tries to convert metal to Gold

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31
Q

Who discovered the element Phosphorous

A

Hennig Brand
He boiled 60 buckets of urine and accidently ended up discovering Phosphorous

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32
Q

Phosphorous is also found inside bones
True or False

A

True

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33
Q

What is an EXOTHERMIC REACTION

A

A reaction that generates Heat

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34
Q

Potassium Hydroxide KOH combines with Nitric acid and form an important salt called

A

Saltpetre

35
Q

Quantitative measure of the acidity or basicity of aqueous or other liquid solutions

A

pH

36
Q

What does pH actually stand for

A

Hydrogen Potentials

37
Q

the pH scale ranges from

A

1 to 14

38
Q

The highly acidic solutions will have a ———— pH

A

Lower pH

39
Q

The two indicators of acid base chemistry are

A
  1. Visual Indicators
  2. Olfactory Indicators
40
Q

The Litmus is an extract of which plant

A

Lichen

41
Q

Who first used the Litmus paper

A

Spanish Physician Arnaldus De Villa Nova

42
Q

Litmus by default is what kind of a dye

A

Blue dye

43
Q

Red cabbage contains a pigment called

A

Anthocyanin

44
Q

In an acidic solution the Anthocyanin changes colour to

A

Pink/Red

45
Q

In a mildly alkaline solution the Anthocyanin changes colour to

A

Purplish to green

46
Q

In a very alkaline solution the anthocyanin changes colour to

A

Yellow

47
Q

ABRACADABRA

A

Acid turns blue litmus Red

48
Q

What is an aqueous solution

A

Water containing solution

49
Q

What is a GLAUBERS REACTION

A

When an acid and a base come together a salt is created and heat is given out

50
Q

What is an ENDOTHERMIC REACTION

A

A reaction where heat is absorbed

51
Q

What is NEUTRALIZATION

A

The chemical reaction that involves bases nullifying acids and creating water and salts

52
Q

The yellow chemical found in Turmeric is

A

Curcumin

53
Q

What colour does turmeric change in an alkaline medium

A

Red

54
Q

List four properties of an Acid

A
  1. Sharp and sour taste
  2. Corrosive action on metals
  3. Turns blue vegetable dye red
  4. Reduce in the acid property when mixed with a base
55
Q

List Three properties of bases

A
  1. Soapy to touch and bitter in tatse
  2. Turns red vegetable dyes to blue
  3. Reduce in the base property when mixed with acid
56
Q

What is CHEMICAL EQUIVALENCE

A

The ability of a fixed quantity of acid to neutralize a fixed quantity of base

57
Q

What is the chemical name of Quick lime

A

Calcium oxide

58
Q

What is the chemical name of Slaked lime

A

Calcium Hydroxide

59
Q

Where is quick lime and slaked lime used

A

As it is a base it is put in acidic soil to help plants grow

60
Q

Remember PAM

What is the usefulness of
Phosphate Salts
Ammonium Salts
Metal Salts

A
  1. Fertilizers
  2. Neutralize acidic rivers and protect aquatic life
61
Q

Where is citric acid used

A

To flavour drinks

62
Q

What are the two uses of table salt

A
  1. Flavouring food
  2. Preserving food
63
Q

Uses of Hydrochloric and phosphoric acid

A

Are components of Lime scale removers

64
Q

Salts are used to produce colours in fireworks
True or False

A

True

65
Q

What colour does Sodium Chloride impart to a fire work

A

Yellow

66
Q

What colour does calcium Chloride give to a fire work

A

Red

67
Q

Name the chemical that gives a Green or Blue flame to a fire work

A

Copper chloride

68
Q

The chemical name of Baking powder

A

Sodium Bicarbonate

69
Q

Name the strong acid found in gastric juice

A

Hydrochloric acid HCL

70
Q

The Hydrochloric acid found in gastric juice is usd to break down which nutrient

A

Protein

71
Q

Stron Alkalis can be as irritating as Srtong acids
True or False

A

True

72
Q

Name a strong Alkali used in Bleach

A

Sodium Hydroxide
NaOH

73
Q

Name two strong Alkalis

A
  1. Sodium Hydroxide NaOH
  2. Potassium Hydroxide KOH
74
Q

Where is potassium hydroxide used

A

In alkaline batteries

75
Q

Name a very common Alkali

A

Sodium Hydroxide

76
Q

Is the drug asprin an acid

A

Yes
Acetylsalicylic acid

77
Q

Can icids be used to clean Rusty/corroded surfaces

A

Yes
Acids react with metal oxide

78
Q

What is Lime Scale

A

It is Lime stone like deposits on ceramic surfaces

79
Q

What is BRINE

A

A highly concentrated solution of common salt

80
Q

What is Electrolysis

A

the process of using electricity to split water into hydrogen and oxygen

81
Q

How is Sodium Hydroxide NaOH produced on a large scale in Industries

A

Electrolysis of Brine

82
Q

The atmosphere of Venus is made up of which acid

A

Sulphuric acid

83
Q

Plastics reacts very fast with acids
True or False

A

False
Plastics dont usually react with acids

84
Q

Why are water pipes, drain pipes and gutters made of plastic

A

Because plastics do not react with acids

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