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AQA GCSE Chemistry > C4-Chemical Changes > Flashcards

C4-Chemical Changes Flashcards

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1
Q

Metal+oxygen —> ?

A

Metal oxides

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2
Q

Oxidation is the … of oxygen

A

Gain

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3
Q

Metals form…ions

A

Positive

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4
Q

Displacement reaction

A

A reaction in which a more reactive element takes the place of a less reactive element.

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5
Q

Ionic equation

A

An ionic equation is one that shows only those ions or atoms that change.

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6
Q

Ions or atoms that don’t change in a chemical reaction are called…

A

Spectator ions

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7
Q

Acids dissolved in water have a pH value of…

A

Less than 7, acids are proton H+ ion donors

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8
Q

Acid + metal —>

A

Salt + hydrogen

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9
Q

Hydrochloric acid

A

HCl -1

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10
Q

Sulfuric acid

A

H₂SO₄

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11
Q

Nitric acid

A

HNO₃ +1

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12
Q

Redox reaction

A

When both oxidation and reduction occur

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13
Q

How are soluble salts made?

A

By reacting acids with solid insoluble substances, such as metals, metal oxides, hydroxides or carbonates.

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14
Q

Acid + base —>

A

Salt + water

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15
Q

Alkalis

A

Have a pH value more than 7

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16
Q

Acid + alkali —>

A

Salt + water

17
Q

Acid + metal carbonate —>

A

Salt + water + carbon dioxide

18
Q

Unit of concentration

A

Moles per decimetre cubed

19
Q

Strong acids are … ionised in an aqueous solution

A

Completely

20
Q

Weak acid is … ionised in an aqueous solution

A

Partially

21
Q

As the pH decreases by one unit, the hydrogen ion concentration of the solution…

A

Increases by a factor of 10

22
Q

Electrolysis

A

Breaks down ionic compounds (salts) into their elements using electricity.

23
Q

Cations

A

Positive ions

24
Q

Anions

A

Negative ions

25
Q

Anode

A

Positive electrode

26
Q

Cathode

A

Negative electrode

27
Q

At the cathode the ion of the …

A

Least reactive electron will be discharged.

28
Q

At the anode if a … is present that will be discharged over anything else.

A

Halide

29
Q

Ore

A

An ore is a material containing enough metal for it to be economically worth extraction.

30
Q

Quantative data

A

Measured empirically

31
Q

Qualitative data

A

Data collected by observation

AQA GCSE Chemistry (4 decks)

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