691693
Description
Flashcards by kate.siena, updated more than 1 year ago
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Created by kate.siena
over 10 years ago
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| Question | Answer |
| If an atom has 12 protons, how many electrons will it have? | 12 |
| What is a compound? | A substance made up of more than one element |
| What is another name for positive ions? | Cations |
| What is another name for negative ions? | Anions |
| Why are ions stable or unreactive? | They have a full outer shell |
| What are isotopes? | Atoms with the same amount of protons, but a different amount of neutrons |
| What is the conservation of mass? | The idea that you cannot lose matter in a reaction, however you can gain it e.g. when magnesium is burned, it joins with oxygen in the surrounding air |
| metal carbonate + heat goes to what? | metal oxide + carbon dioxide |
| alkali metal + water goes to what? | metal hydroxide + hydrogen? |
| What is the relative formula mass of a compound? | The sum of the relative masses of the atoms regarding the formula of the compound e.g. water would be 2 hydrogens with relative mass of 1 each and oxygen with a relative mass of 16, so the relative mass of water is 18. |
| How do you work out the percentage of an element in a compound? | (relative atomic mass of element/relative formula mass of compound) x 100 |
| What is empirical formula? | The simplest ratio of atoms or ions in a compound |
| How do you calculate empirical formula? | Divide the mass of what each element would be in 100g of the compound, by its relative atomic mass to give the ratio of atoms, then divide everything by the smallest number and convert into smallest whole number ratio |
| What is the yield of a reaction? | How much substance you make |
| How do you calculate percentage yield? | (amount of product collected/maximum amount of product possible) x 100 |
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