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Criado por Jess Drane
mais de 9 anos atrás
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Questão | Responda |
Isotopes | Have the same number of electrons and protons as but they have a different number of neutrons. Example: C-11 C-12 C13 they all have 6 protons but C-11 has 5 neutrons, C-12 has 6 neutrons and C-13 has 7 neutrons. |
Shapes of molecules | Electron pairs repel. Molecules have different shapes when there are different numbers of bonded electron pairs. The shapes |
Shapes of Molecules: II | Trigonal planar Tetrahedral Octahedral |
Empirical formulae | Simplist way to show formula. To calculate: find the molar ratio of atoms (divide the mass by the RFM), divide by smallest number, then use ratio to work out formula. |
Ions formulae | Has an overall charge of zero. This means the number of + ions = number of - ions. Example: Ca(2+) Cl(1-) so you need 2 Cl(1-) to make the charges equal. |
Acids | In water they give a pH of less than 7. Common acids: sulphuric acid, hydrochloric acid and nitric acid. H+ ion (proton) is the active ingredients, responsible for all acid reactions. An acid is a proton donor. |
Redox reaction | Oxidation: loss electrons (agent: removes) Reduction: |
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