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

BYJUS SCIENCE GRADE 7 CHEMISTRY Flashcards

(84 cards)

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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
What is the importance of Aqua Regia
It can dissolve gold
26
Bases help to Neutralize acids True or False
True
27
Acids have a corrosive property True or False
True
28
From where is the world Alkali derived
From the Arabic word Al-qualiy which means ashes
29
What is an alkali
Its a Base that can be dissolved in water
30
Who is an Alchemist
A person who tries to convert metal to Gold
31
Who discovered the element Phosphorous
Hennig Brand He boiled 60 buckets of urine and accidently ended up discovering Phosphorous
32
Phosphorous is also found inside bones True or False
True
33
What is an EXOTHERMIC REACTION
A reaction that generates Heat
34
Potassium Hydroxide KOH combines with Nitric acid and form an important salt called
Saltpetre
35
Quantitative measure of the acidity or basicity of aqueous or other liquid solutions
pH
36
What does pH actually stand for
Hydrogen Potentials
37
the pH scale ranges from
1 to 14
38
The highly acidic solutions will have a ------------ pH
Lower pH
39
The two indicators of acid base chemistry are
1. Visual Indicators 2. Olfactory Indicators
40
The Litmus is an extract of which plant
Lichen
41
Who first used the Litmus paper
Spanish Physician Arnaldus De Villa Nova
42
Litmus by default is what kind of a dye
Blue dye
43
Red cabbage contains a pigment called
Anthocyanin
44
In an acidic solution the Anthocyanin changes colour to
Pink/Red
45
In a mildly alkaline solution the Anthocyanin changes colour to
Purplish to green
46
In a very alkaline solution the anthocyanin changes colour to
Yellow
47
ABRACADABRA
Acid turns blue litmus Red
48
What is an aqueous solution
Water containing solution
49
What is a GLAUBERS REACTION
When an acid and a base come together a salt is created and heat is given out
50
What is an ENDOTHERMIC REACTION
A reaction where heat is absorbed
51
What is NEUTRALIZATION
The chemical reaction that involves bases nullifying acids and creating water and salts
52
The yellow chemical found in Turmeric is
Curcumin
53
What colour does turmeric change in an alkaline medium
Red
54
List four properties of an Acid
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
List Three properties of bases
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
What is CHEMICAL EQUIVALENCE
The ability of a fixed quantity of acid to neutralize a fixed quantity of base
57
What is the chemical name of Quick lime
Calcium oxide
58
What is the chemical name of Slaked lime
Calcium Hydroxide
59
Where is quick lime and slaked lime used
As it is a base it is put in acidic soil to help plants grow
60
# Remember PAM What is the usefulness of Phosphate Salts Ammonium Salts Metal Salts
1. Fertilizers 2. Neutralize acidic rivers and protect aquatic life
61
Where is citric acid used
To flavour drinks
62
What are the two uses of table salt
1. Flavouring food 2. Preserving food
63
Uses of Hydrochloric and phosphoric acid
Are components of Lime scale removers
64
Salts are used to produce colours in fireworks True or False
True
65
What colour does Sodium Chloride impart to a fire work
Yellow
66
What colour does calcium Chloride give to a fire work
Red
67
Name the chemical that gives a Green or Blue flame to a fire work
Copper chloride
68
The chemical name of Baking powder
Sodium Bicarbonate
69
Name the strong acid found in gastric juice
Hydrochloric acid HCL
70
The Hydrochloric acid found in gastric juice is usd to break down which nutrient
Protein
71
Stron Alkalis can be as irritating as Srtong acids True or False
True
72
Name a strong Alkali used in Bleach
Sodium Hydroxide NaOH
73
Name two strong Alkalis
1. Sodium Hydroxide NaOH 2. Potassium Hydroxide KOH
74
Where is potassium hydroxide used
In alkaline batteries
75
Name a very common Alkali
Sodium Hydroxide
76
Is the drug asprin an acid
Yes Acetylsalicylic acid
77
Can icids be used to clean Rusty/corroded surfaces
Yes Acids react with metal oxide
78
What is Lime Scale
It is Lime stone like deposits on ceramic surfaces
79
What is BRINE
A highly concentrated solution of common salt
80
What is Electrolysis
the process of using electricity to split water into hydrogen and oxygen
81
How is Sodium Hydroxide NaOH produced on a large scale in Industries
Electrolysis of Brine
82
The atmosphere of Venus is made up of which acid
Sulphuric acid
83
Plastics reacts very fast with acids True or False
False Plastics dont usually react with acids
84
Why are water pipes, drain pipes and gutters made of plastic
Because plastics do not react with acids

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