General Facts-Module 2 0.0 / 5 ? ChemistryGeneralASOCR Created by: kateleesCreated on: 22-01-17 14:02 What is the RAM? The ratio of the average mass of one atom of an element to a twelfth of the mass of the atom of C12. 1 of 26 What is mass spectrometry used for? To identify an unknown compound. 2 of 26 What is an ionic compound? A metal and a non-metal that are chemically bound. 3 of 26 What structure do ionic compounds have? They have a giant lattice structure. 4 of 26 What is water of crystallisation? The number of moles of water that associate with each mole of hydrated salt. 5 of 26 What is the ideal gas law? pV=nRT 6 of 26 What is the definition of an acid? It donates H+ ions and is neutralised by bases and has a pH 7 of 26 What is the definition of a base? It donates OH- ions and is neutralised by acids and has a pH >7 and is a proton acceptor. 8 of 26 What does pH stand for? Potential hydrogen. 9 of 26 How do strong acids dissociate? Fully 10 of 26 How do weak acids dissociate? Partially. 11 of 26 Acid+Metal Salt+Hydrogen 12 of 26 Acid+Alkali Salt+Water 13 of 26 Acid+metal oxide Salt+water+carbon dioxide 14 of 26 Acid+carbonate Salt+water 15 of 26 What is the oxidation state of an atom? 0 16 of 26 What happens to the oxidation number if the element is oxidised? It goes up. 17 of 26 What happens to the oxidation number if the element is reduce? It goes down. 18 of 26 How do you calculate percentage uncertainty? (precision error/reading)x100 19 of 26 What is the electronic configuration for the first 5 shells? 2,8,8,18,18 20 of 26 What are s-orbitals? They hold 2 electrons which spin in the opposite direction. 21 of 26 What are p-orbitals? They have a 8 shape and hold 3 pairs of electrons. 22 of 26 What are d-orbitals? They hold 5 pars of electrons. 23 of 26 What is the Pauli exclusion principle? Each orbital can hold two electrons of opposite spin. 24 of 26 What is the Aufbau principle? The electrons fill the lowest energy orbitals first. 25 of 26 What is Hund's rule? Within a sublevel, place one electron per orbital before pairing them. 26 of 26
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