# Chemistry

Is the Relative Atomic Mass the larger or smaller number of an element?
Larger
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Is the atomic number the larger or smaller number of an element?
Smaller
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What is the Relative Formula Mass of water
18
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Work out Pb2+ OH-
Pb(OH)2
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2Mg + O2 ---> 2MgO If there are 240g of 2Mg, how many grams of 2MgO are there?
Use ratio ----- 400g
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What does a percentage yield show?
How much product was actually made compared with the amount of product that was expected
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How do you calculate percentage yield?
Actual Yield / Theoretical Yield x 100 = Percentage Yield
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What is the Theoretical Yield?
The theoretical yield is the maximum mass of product expected from the reaction, using reacting masses
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What is the Actual Yield?
The actual yield is the mass of the product that is actually obtained from the real chemical reaction
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Is the percentage yield always less than 100%?
Yes
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What is The Atom Economy?
The atom economy is a way of measuring how many atoms are wasted or lost when a chemical is made
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What do Mr and Ar mean?
Mr = Relative Formula Mass, Ar = Relative Atomic Mass
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How do you work out Atom Economy?
Mr of desired product / Total Mr of the products x 100
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## Other cards in this set

### Card 2

#### Front

Is the atomic number the larger or smaller number of an element?

Smaller

### Card 3

#### Front

What is the Relative Formula Mass of water

#### Back ### Card 4

#### Front

Work out Pb2+ OH-

#### Back ### Card 5

#### Front

2Mg + O2 ---> 2MgO If there are 240g of 2Mg, how many grams of 2MgO are there?

#### Back 