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Chemistry > Jc Chemistry Simarises > Flashcards

Jc Chemistry Simarises Flashcards

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1
Q

Condensation

A

Changing of a gas to a liquid

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2
Q

What is an element

A

A substance cannot be Broken down into similar substances

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3
Q

What Is an atom

A

The smartest part of an element

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4
Q

How is a compound formed

A

When two or more elements combined together chemically

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5
Q

What is a molecule

A

Smartest part of an element that can survive on its own

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6
Q

What is a mixture

A

Consist of two or more different substances mingled together but not chemically combined

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7
Q

What is a solution

A

A mixture of a solute and solvent

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8
Q

What is a solute

A

A substance which is dissolved

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9
Q

What is a solvent

A

The liquid in which the solute dissolves

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10
Q

What is a saturated solute

A

One which contains as much dissolved solute as possible at a certain temp

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11
Q

What is a solubility curve

A

Shows how the solubility of a substance changes with increasing temp

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12
Q

What is a concentrated solution

A

Has more solute than solvent

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13
Q

What method is used to separate insoluble solids from a liquids

A

Filtration

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14
Q

What method is used to separate soluble solids from a solution

A

Evaporation

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15
Q

What is crystallization

A

Occurs when crystals appear from a solution when evaporated

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16
Q

How do we separated two liquids with different boiling points

A

Distillation

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17
Q

What method is used to separate a mixture of dissolved substances in a solution

A

Chromatography

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18
Q

What are compounds formed by

A

A group of atoms

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19
Q

What is a chemical bond

A

Holds atoms together in a compound

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20
Q

What is matter

A

Anything that has mass and takes up space

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21
Q

What is the octet rule

A

States that atom bonds together so that each atom ends up with an electron arrangement with 8 electrons

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22
Q

How is an ionic bond formed

A

When electrons are given/taken from an atom

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23
Q

What is an ion

A

Positively/negatively charged atom or group of atoms

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24
Q

When an atom looses electrons

A

It’s becomes positively changed

25
Q

When an atom gains electrons,

A

it becomes negatively charged

26
Q

What is the atomic number

A

The amount of Protons it has in the atom

27
Q

How many electrons does the first she’ll holds

A

2

28
Q

What is the maximum number of electrons a shell can hold

A

8

29
Q

What is the mass number of the atom

A

The number or protons plus the number of neutrons

30
Q

WHat is the mass number of the element

A

The larger number written below the element

31
Q

What do ionic compounds consist of

A

Many appositely charged ins held together strongly to form a crystal Lattice

32
Q

How do we test for an acid

A

Turns blue litmus paper red

33
Q

How do we test for a base

A

Turns red litmus paper blue

34
Q

What is an indicator

A

A chemical which shows if something is a base or acid

35
Q

What does air consist of (elements?)

A

Nitrogen,oxygen,argon,carbon dioxide and water vapor

36
Q

Why is air a mixture

A

The composition varies from place to place and the different gases condense as liquids at different temps.

37
Q

How to test for present of water

A

Turns colbakt chloride paper from blue to pink

38
Q

What is the test for carbon dioxide

A

Limewater is turned milky

39
Q

What is the equation of carbon dioxide

A

Limewater+Carbon dioxide —- chalk + water

40
Q

How is oxygen prepared

A

By the breakdown of hydrogen peroxide in the presence of manganese dioxide

41
Q

What is a catalyst

A

Speeds up a chemical reaction

42
Q

Test for oxygen

A

Relight a flowing splint

43
Q

Properties of oxygen

A

Colour less,tasteless,odourless and heavier than air

44
Q

What is the freezing point of water

A

0

45
Q

What is the boiling point of water

A

100

46
Q

Water treatment 5 stages include

A

Screening,settling,filtration,chlorination and fluoridation

47
Q

What is soft water

A

Water that forms a lather easily with soap

48
Q

What is hardness in water caused by

A

The presence of calcium ions dissolved in water

49
Q

How can water hardness be removed

A

Ion exchange or distillation

50
Q

WHat are the elements of water

A

Hydrogen,oxygen and electrolysis

51
Q

What are electrolysis

A

The production of a chemical reaction by electricity

52
Q

What are the ration of hydrogen and oxygen in carbon dioxide

A

2:1 (H2O)

53
Q

Properties of metals

A

Dense,hard,shiny and high melting points

54
Q

What does ductile mean

A

Able to be in thin wires

55
Q

What dies malleable mean

A

Able to be hammered into shape without breaking

56
Q

What is the corrosion of iron or steel called

A

Rusting

57
Q

What is an alloy

A

A mixture of metals

58
Q

Examples of fossil fuels

A

Coal,oil and gas

Chemistry (4 decks)

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