C5

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  • Created by: Bramble1
  • Created on: 11-02-17 18:11
What are titrations used for?
Allow you to find out EXACTLY how much acid is needed to neutralise a quantity of alkali (or vice versa)
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What is the formula for finding the number of moles in a given mass?
Mass in g (of element or compound) divided by Mᵣ (of element or compound)
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What does empirical formula do?
Gives the smallest whole number ratio of atoms in a compound?
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Formula for percentage composition by mass of compounds?
Aᵣ X no. of atoms (of that element) divided by Mᵣ (of whole compound) X 100
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What does GDA stand for?
Guideline daily amount
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What is the formula for concentration?
No. moles divided by volume
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What do pH curves show?
pH against volume of acid or alkali added
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When do reactions stop?
When one reactant is used up
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Is the following statement correct; faster rates of reaction are shown by steeper curves
Yes
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What is the definition of equilibrium?
When the rate of the forward reaction is equal to that of the back reaction
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What three things can change the position of equilibrium?
Temperature, Pressure, Concentration
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What is the contact process used to make?
Sulfuric acid
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Is the following statement correct; acids do not produce protons in water
No
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Are strong acids better electrical conductors than weak acids?
Yes
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Is the following statement correct; strong acids and weak acids react at the same rate
No, strong acids react faster than weak acids
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Does the volume of gas produced depend on the amount of acid
Yes
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Why does ethanoic acid have a lower electrical conductivity than hydrochloric acid?
there are fewer hydrogen ions available to move in the solution. There is a lower concentration of hydrogen ions to carry the charge in ethanoic acid than there is in hydrochloric acid.
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What is meant by the strength of an acid?
The strength of an acid refers to its ability or tendency to lose a proton (H+).
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What is meant by the concentration of an acid?
A concentrated acid is an acid solution with a high molar concentration of hydrogen ions.
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Other cards in this set

Card 2

Front

What is the formula for finding the number of moles in a given mass?

Back

Mass in g (of element or compound) divided by Mᵣ (of element or compound)

Card 3

Front

What does empirical formula do?

Back

Preview of the front of card 3

Card 4

Front

Formula for percentage composition by mass of compounds?

Back

Preview of the front of card 4

Card 5

Front

What does GDA stand for?

Back

Preview of the front of card 5
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