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Chemistry Yr 9 > Half Term 1 > Flashcards

Half Term 1 Flashcards

1
Q

Oxidation

A

Addition of electrons and changes state

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2
Q

Reduction

A

Obtaining or losing an electron

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3
Q

Properties of metals

A

High melting point, good conductors of electricity, high density, ductile, good conductors of heat

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4
Q

Metals include

A

delocalised electrons and metal ions with a +

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5
Q

How to balance chemical equations:

A

Have to have the same amount of an element on each side e.g: 2fe + cl^2 = 2fecl^3

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6
Q

Mash:

A

Metal+acid -> salt+hydrogen

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7
Q

Basho:

A

Base+acid-> salt+ water

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8
Q

Cashoco:

A

Metal CARBONATE+ acid-> salt+water+carbon dioxide

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9
Q

Endothermic

A

Requires the absorption of heat

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10
Q

Exothermic

A

Releases heat/ energy

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11
Q

Neutralisation

A

The reaction between an acid and base

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12
Q

How does alloying a metal make it better

A

It can change the properties of metals to make it more desirable

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13
Q

What are the most reactive elements

A

Alkali metals

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14
Q

Which of the alkali metals are the most reactive

A

Francium

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15
Q

What are halogen displacements (group7)

A

When we consider one of the displacement reactions, we can see which element is being oxidised and which is being reduced.

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16
Q

Element

A

A pure substance that has the same numbers of protons in their nuclei

17
Q

Molecule

A

2 or more atoms chemically joined

18
Q

Compound

A

2 or more elements chemically joined

19
Q

Mixture

A

2 or more substances that are not chemically joined

20
Q

Why do metals conduct electricity

A

They allow electrons to flow between the and atoms

21
Q

Why do metals have high melting points

A

As they have stronger chemical bonds

22
Q

Why are metals malleable

A

The bonds are stonger so they shift and dont break

23
Q

Alloy

A

An alloy is when a metal is combined with one or more other metals

24
Q

What are the signs of a chemical reaction

A

Color Change.Production of an odor Change of Temperature.Evolution of a gas (formation of bubbles) Precipitate (formation of a solid)
2

Chemistry Yr 9 (4 decks)

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