Compounds, Formulae and Equations Revision. 0.0 / 5 ? ChemistryCompounds,Formulae and Equations.A2/A-levelOCR Created by: ElishaGCreated on: 18-02-17 14:23 What are ions? An ion is an atom or group of atoms that has become positively charged or negatively charged by losing or gaining electrons. 1 of 22 What is an anion? A negatively charged ion. 2 of 22 What is a cation? A positively charged ion. 3 of 22 What is the Octet Rule? The tendency for atoms to acquire a Noble Gas electron configuration. 4 of 22 What is an elemental ion? When one type of atom has become positively charged or negatively charged by losing or gaining electrons. 5 of 22 What is a polyatomic ion? When a group of atoms has become positively or negatively charged by losing or gaining electrons. 6 of 22 What is valency? A measure of the number of electrons an atom or group of atoms used in bonding with another species. 7 of 22 What is oxidation number? A measure of the number of electrons an atom uses to bond to atoms of a different element. 8 of 22 What is a covalent bond? The electrostatic attraction between a shared pair of electrons between two atoms. 9 of 22 What is a metallic bond? The attraction of positive metal ions to delocalised electrons. 10 of 22 What is an ionic bond? The electrostatic attraction between oppositely charged ions. 11 of 22 What is the formula of the ammonium ion? (NH4)+. 12 of 22 What is the formula of the Nitrate ion? (NO2)-. 13 of 22 What is the formula of the sulfate ion? (SO4)2- 14 of 22 What is the formula of the phosphate ion? (PO4)3-. 15 of 22 What is the formula of the hydroxide ion? (OH)-. 16 of 22 What is the formula of the carbonate ion? (CO3)2-. 17 of 22 What is the formula of hydrogen sulfate? (HSO4)- 18 of 22 What is the formula of hydrogen carbonate? (HCO3)- 19 of 22 List the types of compound that are always soluble. Compounds of ammonium, sodium and potassium. 20 of 22 Which types of salt are always soluble? Nitrates. Chlorides (except AgCl). Sulfates (except BaSO4). Phosphates. 21 of 22 Which bases are always insoluble? Carbonates, Oxides and Hydroxides. 22 of 22
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