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Chemistry - Module 2 > 3) Acids and Redox > Flashcards

3) Acids and Redox Flashcards

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1
Q

Use this card to test knowledge of names of acids and bases from ‘Acids and Redox’ card.

A

Rate knowledge 1-5.

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2
Q

What happens when an acid is dissolved in water?

A

Acids release H+ ions in aqueous solution.

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3
Q

What happens when an alkali is dissolved in water?

A

Alkalis release OH- ions in aqueous solution.

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4
Q

Define strong acid.

A

A strong acid completely dissociates in aqueous solution.

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5
Q

Define weak acid.

A

A weak acid only partially dissociates in aqueous solution.

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6
Q

What is neutralisation?

A

The reaction of H+ and OH- to form water.

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7
Q

Use this card to test reactions of acids from ‘Acids and Redox’ card.

A

Rate knowledge 1-5.

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8
Q

What is the oxidation number of an uncombined element?

A

0.

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9
Q

What is the oxidation number of combined oxygen?

A

-2.

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10
Q

What is the oxidation number of combined oxygen in peroxides?

A

-1.

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11
Q

What is the oxidation number of combined hydrogen?

A

+1.

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12
Q

What is the oxidation number of combined hydrogen in metal hydrides?

A

-1.

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13
Q

What is the sum of the oxidation numbers of a simple ion?

A

The charge of the ion.

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14
Q

In terms of electrons, what is oxidation and reduction?

A
  • Oxidation is the loss of electrons.

- Reduction is the gain of electrons.

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15
Q

In terms of oxidation number, what is oxidation and reduction?

A
  • Oxidation is an increase in oxidation number.

- Reduction is a decrease in oxidation number.

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16
Q

Why is calcium nitrate an example of a salt?

A

The H+ ion in a nitric acid has been replaced by a metal ion.

17
Q

Explain how the hydroxide ion in aqueous calcium hydroxide acts as a base when it neutralises dilute nitric acid.

A

It accepts a proton.

18
Q

Explain what is meant by the term salt.

A

When the H+ in an acid is replaced by a metal ion.

19
Q

A student added an excess of hydrochloric acid to an old sample of magnesium oxide that is contaminated with magnesium carbonate. State two observations that the student would make.

A
  • Solid dissolves.

- Fizzing.

20
Q

Define an acid.

A

A proton donor.

21
Q

A length of magnesium ribbon is added to hydrochloric acid. Describe what you would see in this reaction.

A

Fizzing.

Chemistry - Module 2 (5 decks)

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