Chemistry C2 How much? 3.1 - 3.8

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What is an atom's atomic and mass number?
Atomic numbers are the protons and electrons, the mass number is the total number of protons and neutrons.
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What are isotopes?
Isotopes are atoms of the same element with different numbers of neutrons.
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How can we compare the masses of atoms?
We compare the masses of atoms by measuring them to atoms of Carbon-12.
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How can we calculate the relative formula mass of a compound from the element it is made of?
One mole of any substance is it's relative formula mass, in grams.
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How can we calculate the percentage of an element in a compound from it's formula?
The relative atomic masses of the elements in a compound and it's formula can be used to work out it's % composition.
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What do balanced symbol equations tell us about chemical reactions?
Balanced symbol equations tell us the number of moles of substances involved in a chemical reaction.
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What do we mean by the yield of a chemical reaction.
The yield of a chemical reaction describes how much product is made with the maximum that could be made (100%)
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What factors affect a yeild?
Being left behind in the apparatus and difficulty separating the products from the reaction mixture.
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What is a reversible reaction?
The reactants in the reaction can return back to there original state.
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How do we represent a reversible reaction?
Using the ⇌ sign
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What are food additives and how can we identify them?
Added to food to enhance taste and can be identified by using paper chromatography.
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How can we use gas chromatography to separate compounds in a sample mixture?
When separated on the paper we can use a mass spectrometer to identify them.
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Other cards in this set

Card 2

Front

What are isotopes?

Back

Isotopes are atoms of the same element with different numbers of neutrons.

Card 3

Front

How can we compare the masses of atoms?

Back

Preview of the front of card 3

Card 4

Front

How can we calculate the relative formula mass of a compound from the element it is made of?

Back

Preview of the front of card 4

Card 5

Front

How can we calculate the percentage of an element in a compound from it's formula?

Back

Preview of the front of card 5
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