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Chemistry > General > Flashcards

General Flashcards

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1
Q

What is the word equation for the thermal decomposition of Limestone?

A

Calcium Carbonate –> Calcium oxide + carbon dioxide

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2
Q

What is the symbol equation for the reaction of calcium oxide with water?

A

CaO + H2O –> Ca(OH)2

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3
Q

Why does limewater go cloudy when CO2 is passed through?

A

Calcium carbonate is formed

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4
Q

What do metal carbonates and acids react to form?

A

A salt, carbon dioxide & water

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5
Q

1) What salt does hydrochloric react with acid to form?

2) What salt does sulfuric acid react with acid to form?

A

1) Chloride salt

2) Sulfate salt

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6
Q

What is a hydrocarbon made from

A

Carbon and hydrogen only

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7
Q

What is concrete made from?

A

Cement, sand and aggregate (water and gravel)

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8
Q

What is Mortar made from?

A

Cement water and sand

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9
Q

How is cement made

A

Heated in a kiln at 1450 with powdered clay and limestone

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10
Q

What is alkali

A

A base (substance with a pH 7+) that dissolves in water, they form OH- ions in water

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11
Q

What is neutralisation? What’s the equation

A

A reaction between a acid and a base

Acid + base –> salt + water

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12
Q

Name 3 indicators and what they do…

A

Universal indicator; red in acidm purple in alkali
Methyl orange; red in acid, yellow in alkali and neutral
Phenolphthalein; pink in alkali, colourless acid or neutral

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13
Q

What are the state symbols for

1) A solid
2) A liquid
3) Gas
4) Dissolved in water

A

1) (s)
2) (l)
3) (g)
4) (aq)

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14
Q

What is the equation for metal and acid reaction?

A

Metal + acid –> salt + hydrogen

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15
Q

What is the equation for a acid and metal oxide reacting?

A

Acid + metal oxide –> salt water

Neutralization reaction

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16
Q

What is the equation for a acd and metal hydroxide reacting?

A

Metal + metal hydroxide –> salt + water

Neutralization reaction

17
Q

Equation for an acid + carbonate reacting…

A

Acid + carbonate –> salt + water + carbon dioxide

18
Q

What does ammonia dissolve in water to make?

A

An alkaline solution.

19
Q

What is the equation for a reaction of ammonia and nitric acid?

A

Ammonia + nitric acid –> ammonium nitrate

Unlike other neutralisation reactions it doesn’t produce any water

20
Q

Cracking is a thermal decomposition reaction.
What are the stages?
What temperature and catalyst is needed?

A

Vapirise the long chain hydrocarbon.
Pass over a powdered catalyst of aluminium oxide
At a temperature of 400-700 degrees
The The long chain molecules split apart on the surface of the specks of catalyst

21
Q

What is formed when a alkali metal reacts with water?

A

Hydrogen and an alkaline substance

22
Q

What is formed when a alkali metal reacts with oxygen?

A

An oxde

23
Q

Why do elements in the same group in the periodic table have similar properties?

A

Elements in the same group in the periodic table have the same number of electrons in their highest energy level giving them similar chemical properties

Chemistry (5 decks)

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