Flashcards
1.3 Chemical reactions and related calculations
Flashcards do conjunto (9)
- 1What happens when elements react?Their atoms join with other atoms to form compounds
- 2What happens to electrons when elements react?They are given, taken or shared to form ions or molecules to attain the electron arrangement of the nearest noble gas
- 3What is the relative formula mass of a compound?The sum of the relative atomic masses of the atoms in the numbers shown in the formula
- 4What is a mole of a substance?The relative formula mass of a substance, in grams
- 5How can the percentage mass of an element be calculated?From the relative atomic mass of the element in the formula and the relative formula mass of the compound
- 6How can the empirical formula of a compound be calculated?From the masses or percentages of the elements in a compound
- 7How can chemical reacions be represented?By word equations or by symbol equations
- 8How can information about the states of reactants and products be included in chemical reactions?(g) for gas
(l) for liquid
(s) for solid
(aq) for aqueous solution - 9Are any atoms lost or made during chemical reactions?No, so the mass of the products equals the mass of the reactants
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- GCSE Chemistry (.1 The fundamental ideas in chemistry) FlashCards sobre 1.3 Chemical reactions and related calculations, criado por Anisha Rai em 20-04-2016.
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- Anisha Rai
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