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13 Cards in this Set
- Front
- Back
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What are molecules? |
Two or more atoms held together by covalent bonds |
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What is the molecular formula? |
Number of atoms of each element in a molecule |
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What is the empirical formula? |
Simplest whole number ratio of atoms of each element in a compound |
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What does relative molecular mass compare? |
The mass of a molecule with the mass of an atom of carbon-12 |
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How do you calculate relative molecular mass? |
Add up the relative atomic masses of the elements in the molecule |
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Give examples of compounds that exist as simple molecules |
CO2 & H2O |
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Give examples of compounds that exist as giant crystalline structures |
All ionic compounds NaCl & MgO |
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What is the difference between RMM and RFM |
Relative molecular mass is for molecules and relative formula mass is for giant crystalline structures |
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What does relative formula mass compare? |
The mass of a formula unit with the mass of an atom of carbon-12 |
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What is analysis? |
Investigating the chemical composition of a substance |
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What is the common feature of many coloured salts? |
They are hydrated |
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What does hydrated mean? |
Water molecules are part of the crystalline structure |
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What is the water part of a crystalline structure known as? |
Water of crystallisation |
