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GCSE Chemistry - Paper 1 > Chemical Changes > Flashcards

Chemical Changes Flashcards

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1
Q

How can you measure the pH of a solution?

A

Using an indicator or pH probe.

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2
Q

What is an acid?

A

An acid is a substance that forms aqueous solutions with a pH less than 7. Acids form H+ ions in water.

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3
Q

What is a base?

A

A base is a substance with a pH greater than 7.

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4
Q

What is an alkali?

A

An alkali is a base that dissolves in water to form a solution with a pH greater than 7. Alkalis form OH- ions in water.

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5
Q

What is the name for the reaction between acids and bases?

A

Neutralisation

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6
Q

Acid + Base →

A

Acid + Base → Salt + Water

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7
Q

What are strong acids?

A

Strong acids are acids that ionise completely in water. All acid particles dissociate to release H+ ions.

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8
Q

What is pH?

A

The measure of the concentration of hydrogen ions.

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9
Q

Acid + Metal Oxide →

A

Acid + Metal Oxide → Salt + Water

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10
Q

Acid + Metal Hydroxide →

A

Acid + Metal Hydroxide → Salt + Water

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11
Q

Acid + Metal Carbonate →

A

Acid + Metal Carbonate → Salt + Water + Carbon Dioxide

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12
Q

Acid + Metal →

A

Acid + Metal → Salt + Hydrogen

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13
Q

Metal + Water →

A

Metal + Water → Metal Hydroxide + Hydrogen

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14
Q

What is oxidisation?

A

Gain of oxygen or loss of electrons.

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15
Q

What is reduction?

A

Loss of oxygen or gain of electrons.

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16
Q

Which ions move to the cathode?

A

Positive ions, as the cathode has a negative charge.

17
Q

What is an electrolyte?

A

A liquid or solution that can conduct electricity.

18
Q

What is the test for chlorine?

A

Chlorine bleaches damp litmus paper, turning it white.

19
Q

What is the test for hydrogen?

A

Htdrogen makes a “squeaky pop” with a lighted splint.

20
Q

What is the test for oxygen?

A

Oxygen will relight a glowing splint.

GCSE Chemistry - Paper 1 (5 decks)

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