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HIS GRADE 7 CHEMISTRY 101 > Term 1 Finals > Flashcards

Term 1 Finals Flashcards

1
Q

What is chemistry?

A

The study of the structure and properties of substances

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2
Q

All substances are …

A

Chemicals

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3
Q

Whois a pharmacist?

A

A type of chemist making up prescriptions and selling cosmetics in a chemists shop

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4
Q

What does the chemical industry make?

A

A major contribution to the wealth of our country and the quality of our lives

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5
Q

What is a raw material?

A

A raw material is used to make a profit by manufacturing useful products

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6
Q

What are the main raw material?

A

Coal - Crude Oil - Natural Gas - Metal Ores - Minerals - Air - Water

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7
Q

What is the equipment in a laboratory called?

A

Apparatus

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8
Q

What is the bunsen burner?

A

The main source of of heat in the lab

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9
Q

Where is the hottest part of the bunsen burner?

A

Top of the central cone

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10
Q

What can be used to measure the mass of a substance

A

A balance

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11
Q

What is the most common balance?

A

Electronic balance

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12
Q

How many grams are in one kilogram?

A

1000 grams

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13
Q

What do you do to place a chemical on a weighing pan?

A

You place the chemical in a beaker or a suitable container

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14
Q

How do you find the weight of the substance in the container?

A

You subtract the mass of the beaker from the mass of the beaker + substance

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15
Q

What is the “tare facility” button?

A

It resets the weight back to zero

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16
Q

What is the volume of a liquid?

A

Volume is a measure of how much space it takes up

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17
Q

What is the appropriate apparatus for measuring volume?

A

Burettes, pipettes, measuring cylinders, droppers

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18
Q

How many cubic centimeters are in a litre?

A

1000 cubic centimeters

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19
Q

Which unit has the same value as cubic centimeter?

A

Millilitres

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20
Q

What is a meniscus?

A

When the surface of a liquid curves downwards at the middle and upwards at the edges

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21
Q

How do you measure the scale of a meniscus?

A

At the downwards curve

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22
Q

What apparatus is used to measure temperature?

A

Thermometer

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23
Q

What are the two common types of thermometers?

A

Alcohol in glass thermometer and Mercury in glass thermometer

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24
Q

What unit do you use to measure temperature?

A

The celsius scale

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25
What is the boiling point if water.
100 C*
26
What is the freezing point of water?
0 C*
27
What apparatus is used to measure time?
Stopwatch
28
What are the units for time?
Hours (hrs) minutes (min) seconds (s)
29
How many second are in one minute?
60 seconds
30
How many minutes are in one hour?
60 minutes
31
What are hazard symbols?
Labels used to show certain chemicals can cause particular problems
32
Define corrosive:
Substances which can burn and destroy living tissue
33
Define explosive:
Substances which may explode if heated, exposed to a flame, or knocked
34
Define flammable:
Substance which may catch on fire easily if in contact with air
35
Define toxic:
Substance which represent a serious risk of causing death by poisining
36
Define harmful:
Substances which represent a moderate risk to health
37
Define Irritant:
Substances which can cause inflammation of the skin
38
What is the aim?
The aim describes what you’re trying to find out
39
What is the method?
The method describes how the experiment is to be carried out
40
What are the results?
The results should be recorded in a suitable form
41
What is the conclusion?
The conclusion describes what you have found out
42
What is a chemical change?
A change which involves the formation of new substances
43
What is effervescence?
When agas is formed in a chemical reaction
44
What is precipitation?
When a solid is formed in a chemical reaction
45
What us a precipitate?
The solid formed in precipitation
46
What does combustion mean?
Explosion
47
Which reaction gives out heat?
Exothermic reaction
48
Which reaction takes in heat?
Endothermic reaction
49
What is a reactant?
The substances we start with in a chemical reaction
50
What is a product?
The new substances formed in a chemical reaction
51
How are chemical reactions often described?
Using chemical equations
52
What is a word equation?
A word equation is the word form of a chemical equation
53
What is photosynthesis?
The process of a plant making food
54
Which change is reversable?
Physical change
55
Which change isn’t reversable?
Chemical change
56
Name the differences between a physical change and a chemical change:
Physical changes have no new substance is formed, but the materials in a chemical change ,ay alter state or be mixed together
57
Is mixing substances described as a physical change?
Yes, as long as no new substances are formed
58
What is air?
A mixture of oxygen, nitrogen, argon, and carbon dioxide
59
What is sea water?
A mixture of water, salt, and other dissolved materials
60
What is soil?
A mixture of rock fragments, water, dissolved minerals, air, and humus
61
What is a rock?
A mixture of different minerals
62
Name the states of matter:
Solid Liquid Gas
63
What is humus?
A type of fertilizer
64
What are the changes of state?
Melting Boiling Evaporation Condensation Freezing Sublimation
65
How do you change a state?
By heating or cooling
66
What is matter?
The scientific word used to describe all the different types of substances and materials found in our universe
67
Which atoms are the closest?
Liquid
68
Which atoms are the furthest?
Gas
69
Which atoms wobble back and forth?
Solid
70
Which atoms move around each other?
Liquid
71
Which atoms move in about all directions?
Gas

HIS GRADE 7 CHEMISTRY 101 (1 decks)

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