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Science Sec 3 > Elements Compounds & Mixtures > Flashcards

Elements Compounds & Mixtures Flashcards

1
Q

What is an element?

A

Pure substance that cannot be broken into simplest substances via chemical processes

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2
Q

Elements can be classified into

A

metal, non metallic properties

Physical state at room temperature

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3
Q

What is an atom?

A

The smallest particles that has the property of the element

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4
Q

What are noble gases that exist as individual atom called?

A

Monatomic elements

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5
Q

What is molecules?

A

Two or more atom chmeically combined together

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6
Q

What is a polyatomic molecule?

A

Three or more atom chemically combined together

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7
Q

Give 3 reasons why pure copper is a good choice for making wire?

A

Ductility
Malleability
Good electrical conductivity

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8
Q

What elements has a high melting point 120 degree Celsius and is a non conductor of electricity

A

oxygen
bromine
carbon

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9
Q

What is a compound?

A

Pure substances that contain 2 or more elements that are chemically bond together

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10
Q

Composition of compound is made up of?

A

Molecules

Ion

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11
Q

Magnesium + oxygen =

A

Magnesium oxide

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12
Q

What is the ratio of hydrogen to oxygen in water

A

hydrogen : oxygen = 2 : 1

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13
Q

What is the ratio of Hydrogen Chloride?

A

H :Cl

1 : 1

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14
Q

What is the ratio of Carbon Dioxide?

A

C : O

1 : 2

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15
Q

What is the ratio of Carbon Monoxide?

A

C : O

1 : 1

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16
Q

What is the ratio of Sulfuric Acid?

A

H : S : O

2 : 1 : 4

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17
Q

What is the ratio of ethanol?

A

C : H : O

2 : 6 : 1

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18
Q

Decomposition of compounds can be done via

A

Electrolysis

Thermal decomposition

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19
Q

What is a mixture?

A

A mixture is made up of 2 or more substances that are not chemically combined

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20
Q

What is the difference between compound and mixture in terms of separation?

A

Compound - only via chemical

Mixture - physical

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21
Q

What is the difference between compound and mixture in terms of properties?

A

Compound - different

Mixture -has the properties of substances

22
Q

What is the difference between compound and mixture in terms of energy/change?

A

Compound - heat/light given in/out

Mixture - NA

23
Q

What is the difference between compound and mixture in terms of composition?

A

Compound - fixed proportion

Mixture - not fixed

24
Q

What is the appearance of Aluminium?

A

silvery solid

25
Q

What is the appearance of Copper?

A

Reddish brown solid

26
Q

What is the appearance of Iron?

A

Grey solid

27
Q

What is the appearance of Magnesium?

A

Silvery solid

28
Q

What is the appearance of Mercury?

A

Silvery liquid

29
Q

What is the appearance of Zinc?

A

Greyish solid

30
Q

What is the appearance of Carbon?

A

Black solid

31
Q

What is the appearance of Hydrogen?

A

Colourless Gas

32
Q

What is the appearance of Iodine?

A

Black solid

33
Q

What is the appearance of Nitrogen?

A

Colorless Gas

34
Q

What is the appearance of Oxygen

A

Colorless Gas

35
Q

What is the appearance of Sulphur?

A

Yellow solid

36
Q

What is the common usage of Copper?

A

Waterpipes

brass

37
Q

What is the common usage of Aluminium?

A

Aircraft
construction
cans

38
Q

What is the common usage of Iron?

A

Steel

construction work

39
Q

What is the common usage of Magnesium?

A

firework

medicine

40
Q

What is the common usage of Mercury?

A

Amalgam filling

thermometer

41
Q

What is the common usage of zinc?

A

casings

dry celss

42
Q

What is the common usage of carbon?

A

Charcoal
lead
diamond

43
Q

What is the common usage of Hydrogen?

A

Balloon

Rocket fuel

44
Q

What is the common usage of Iodine?

A

Antiseptic

medicine

45
Q

What is the common usage of Nitrogen?

A

fertilizers

freezing frozen food

46
Q

What is the common usage of Oxygen?

A

oxygen tank

47
Q

What is the common usage of Sulphur?

A

Insecticide

drugs

48
Q

Compounds can be formed via

A

Combustion
Reaction of element with other compound
Reaction of compound with other compound
Decomposition of compound

49
Q

What are the types of compound

A

Covalent

ionic

50
Q

What is the difference in covalent and ionic compounds?

A

Colvalent particles share the same electron

Ionic is strong electrostatic particles

Science Sec 3 (2 decks)

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