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HIS GRADE 7 CHEMISTRY 101 > Term 1 Finals > Flashcards

Term 1 Finals Flashcards

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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
Q

What is the boiling point if water.

A

100 C*

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26
Q

What is the freezing point of water?

A

0 C*

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27
Q

What apparatus is used to measure time?

A

Stopwatch

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28
Q

What are the units for time?

A

Hours (hrs) minutes (min) seconds (s)

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29
Q

How many second are in one minute?

A

60 seconds

30
Q

How many minutes are in one hour?

A

60 minutes

31
Q

What are hazard symbols?

A

Labels used to show certain chemicals can cause particular problems

32
Q

Define corrosive:

A

Substances which can burn and destroy living tissue

33
Q

Define explosive:

A

Substances which may explode if heated, exposed to a flame, or knocked

34
Q

Define flammable:

A

Substance which may catch on fire easily if in contact with air

35
Q

Define toxic:

A

Substance which represent a serious risk of causing death by poisining

36
Q

Define harmful:

A

Substances which represent a moderate risk to health

37
Q

Define Irritant:

A

Substances which can cause inflammation of the skin

38
Q

What is the aim?

A

The aim describes what you’re trying to find out

39
Q

What is the method?

A

The method describes how the experiment is to be carried out

40
Q

What are the results?

A

The results should be recorded in a suitable form

41
Q

What is the conclusion?

A

The conclusion describes what you have found out

42
Q

What is a chemical change?

A

A change which involves the formation of new substances

43
Q

What is effervescence?

A

When agas is formed in a chemical reaction

44
Q

What is precipitation?

A

When a solid is formed in a chemical reaction

45
Q

What us a precipitate?

A

The solid formed in precipitation

46
Q

What does combustion mean?

A

Explosion

47
Q

Which reaction gives out heat?

A

Exothermic reaction

48
Q

Which reaction takes in heat?

A

Endothermic reaction

49
Q

What is a reactant?

A

The substances we start with in a chemical reaction

50
Q

What is a product?

A

The new substances formed in a chemical reaction

51
Q

How are chemical reactions often described?

A

Using chemical equations

52
Q

What is a word equation?

A

A word equation is the word form of a chemical equation

53
Q

What is photosynthesis?

A

The process of a plant making food

54
Q

Which change is reversable?

A

Physical change

55
Q

Which change isn’t reversable?

A

Chemical change

56
Q

Name the differences between a physical change and a chemical change:

A

Physical changes have no new substance is formed, but the materials in a chemical change ,ay alter state or be mixed together

57
Q

Is mixing substances described as a physical change?

A

Yes, as long as no new substances are formed

58
Q

What is air?

A

A mixture of oxygen, nitrogen, argon, and carbon dioxide

59
Q

What is sea water?

A

A mixture of water, salt, and other dissolved materials

60
Q

What is soil?

A

A mixture of rock fragments, water, dissolved minerals, air, and humus

61
Q

What is a rock?

A

A mixture of different minerals

62
Q

Name the states of matter:

A

Solid
Liquid
Gas

63
Q

What is humus?

A

A type of fertilizer

64
Q

What are the changes of state?

A

Melting
Boiling
Evaporation
Condensation
Freezing
Sublimation

65
Q

How do you change a state?

A

By heating or cooling

66
Q

What is matter?

A

The scientific word used to describe all the different types of substances and materials found in our universe

67
Q

Which atoms are the closest?

A

Liquid

68
Q

Which atoms are the furthest?

A

Gas

69
Q

Which atoms wobble back and forth?

A

Solid

70
Q

Which atoms move around each other?

A

Liquid

71
Q

Which atoms move in about all directions?

A

Gas

HIS GRADE 7 CHEMISTRY 101 (1 decks)

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