3) Acids and Redox Flashcards
Use this card to test knowledge of names of acids and bases from ‘Acids and Redox’ card.
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What happens when an acid is dissolved in water?
Acids release H+ ions in aqueous solution.
What happens when an alkali is dissolved in water?
Alkalis release OH- ions in aqueous solution.
Define strong acid.
A strong acid completely dissociates in aqueous solution.
Define weak acid.
A weak acid only partially dissociates in aqueous solution.
What is neutralisation?
The reaction of H+ and OH- to form water.
Use this card to test reactions of acids from ‘Acids and Redox’ card.
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What is the oxidation number of an uncombined element?
0.
What is the oxidation number of combined oxygen?
-2.
What is the oxidation number of combined oxygen in peroxides?
-1.
What is the oxidation number of combined hydrogen?
+1.
What is the oxidation number of combined hydrogen in metal hydrides?
-1.
What is the sum of the oxidation numbers of a simple ion?
The charge of the ion.
In terms of electrons, what is oxidation and reduction?
- Oxidation is the loss of electrons.
- Reduction is the gain of electrons.
In terms of oxidation number, what is oxidation and reduction?
- Oxidation is an increase in oxidation number.
- Reduction is a decrease in oxidation number.
Why is calcium nitrate an example of a salt?
The H+ ion in a nitric acid has been replaced by a metal ion.
Explain how the hydroxide ion in aqueous calcium hydroxide acts as a base when it neutralises dilute nitric acid.
It accepts a proton.
Explain what is meant by the term salt.
When the H+ in an acid is replaced by a metal ion.
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.
- Solid dissolves.
- Fizzing.
Define an acid.
A proton donor.
A length of magnesium ribbon is added to hydrochloric acid. Describe what you would see in this reaction.
Fizzing.
