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310417-Nat 5 chemistry Unit 1 > Acids and alkali > Flashcards

Acids and alkali Flashcards

(50 cards)

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1
Q

Formula Sodium Hydroxide

A

NaOH

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2
Q

Formula Magnesium Hydroxide

A

Mg(OH)2

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3
Q

What type of elements makes acid?

A

non-metals

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4
Q

Formula for hydrochloric acid

A

HCl

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5
Q

Formula Nitric acid

A

HNO3

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6
Q

Formula for sulfuric acid

A

H2SO4

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7
Q

Formula for Lithium Oxide

A

Li2O

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8
Q

Is Calcium oxide an acid, base or alkali?

A

alkali

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9
Q

what is the difference between an alkali and a base?

A

An alkali is a soluble base. (all alkali are bases but not all bases are alkali)

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10
Q

What soluble mean?

A

It can dissolve in water

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11
Q

What page in the databook can I find if a substance is soluble in water or not?

A

page 8

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12
Q

What would be the pH of water if we added carbon dioxide

A

acidic

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13
Q

What would be the pH of water if we added Silicon dioxide

A

neutral (silicon dioxide doesn’t dissolve in water)

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14
Q

What would be the pH of water if we added Copper(II) oxide?

A

neutral, copper (II) oxide is insoluble in water.

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15
Q

What would be the pH of water if we added phosporous oxide

A

acidic

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16
Q

What would be the pH of water if we added potassium oxide

A

alkali

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17
Q

What is a solute?

A

a solid (eg. SALT)

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18
Q

What is a solvent ?

A

A liquid (eg: Water)

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19
Q

What is a solution?

A

When a solute disolve in a solvent (eg: sea water)

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20
Q

What does saturated mean?

A

Too much solute / when the solute stop dissolving in the solution

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21
Q

What is a precipitate

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A

A soluble substance appears in solution

22
Q

What is the pH of acids?

23
Q

What is the pH of water/ neutral solution?

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A

pH of exactly 7

24
Q

What is the pH of a base/ alkali?

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A

pH more than 7

25
What is the pH scale a measure of?
The concentration of hydrogen ions (H+) in any given solution
26
How can the pH be measured?
pH meter pH indicator pH paper
27
What is the name of OH-
Hydroxide ions
28
What is the name for H+
Hydrogen ions
29
In pure water what is the concentration of H+ and OH- ions?
Hydrogen ions = hydroxide ions
30
What ion does all acids contain?
H+ / Hydrogen ions
31
Why do acidic and alkaline solutions conduct electricity well?
They contain oppositely charged ions that are free to move in solution and can carry charge
32
What is the proportion of hydroxide and hydrogen ions in alkaline solution ?
More OH- than H+
33
What happens to the pH and the concentration of an acid when you dilute it?
The pH goes up and concentration of the acid goes down
34
What happens to the pH and the concentration of an alkali when you dilute it?
The pH goes down and concentration of the alkali goes down
35
If a metal oxide is soluble in water what does it produce ?
An alkali
36
If a non metal oxide is soluble in water what does it produce
An acid
37
What does acids contain?
Charged particles called hydrogen ions
38
what is the difference between a base and an alkali
A base is a substance that neutralises an acid A base that is soluble in an alkali All alkalis are bases but not all bases are alkalis
39
What is a spectator ion?
It's an ion that exists in the same form on both the reactant and product sides of a chemical reaction
40
what is titration?
an experimental method to determine the concentration of an unknown solution.
41
How to recognise hydrogen? (test for hydrogen?)
Burns with a pop
42
How to recognise oxygen? (test for oxygen)
Relights a glowing splint
43
How to recognise carbon dioxide? (test for carbon dioxide)
Turns lime water cloudy
44
What is the name of a metal oxide that do not dissolve in water but is capable of neutralising an acid?
a base
45
What are the products of this reaction: Hydrochloric acid + potassium carbonate?
potassium chloride + water + carbon dioxide
46
What are the products for this reaction: | Sulfuric acid + Lithium oxide? (write the chemical formula for the salt produced)
Lithium sulfate + water Salt: Lithium Sulfate, formula: Li2SO4
47
What is the formula for Sodium carbonate?
Na2CO3
48
Formula for Sodium hydroxide (Alkali)
NaOH
49
Write the chemical equation for the neutralisation reaction between Magnesium oxide and Nitric acid
MgO + HNO3 --> Mg(NO3)2 + H2O
50
H2SO4 + 2NaOH If 20ml of acid of concentration 0.2 mol/l were used to neutralised 25ml sodium hydroxide, what is the concentration of sodium hydroxide?
H2SO4 + 2NaOH n=0.004 n=0.008 C=0.2 V=0.025 V=0.02 C= 0.32 Concentration of NaOH=0.32mol/l

310417-Nat 5 chemistry Unit 1 (1 decks)

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