2290794
Description
Flashcards by moniquepowell99, updated more than 1 year ago
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Created by moniquepowell99
over 9 years ago
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| Question | Answer |
| Particles in atoms | Atomic number = number of protons Electron amount = to proton amount Atoms have no overall charge Neutrons + Protons=mass number |
| Electronic structure | 'Rings' are energy levels (so, the innermost ring is the lowest energy level, etc.) When writing - 1st - 1-2 , 2nd - -8, 3rd - -8, 4th - 1-2 |
| Electronic structure | 'Rings' are energy levels (so, the innermost ring is the lowest energy level, etc.) When writing - 1st - 1-2 , 2nd - -8, 3rd - -8, 4th - 1-2 |
| Electronic structures and groups | (Noble gases) Group 0 - no electrons on outer-shell, Group 1 - 1, group 1 + oxygen = burn vigorously to produce solid metal oxides. (4Na + O2 --> 2Na2O for example). Group 1 + water = reacts vigorously to produce hydrogen gas. |
| Making compounds | Metal + non-metal form compounds (made of ions) An ion is a charged particle, formed when an atom loses/gains electrons. Compounds formed from reactions between non-metals consists of molecules. (the atoms are shared and covalently bonded) |
| Chemical equations | Word equation Symbol equation |
| Limestone | A type of rock, made of mostly calcium carbonate ( CaCO3 ) Uses - cement, mortar, concrete, as blocks/slabs for walls/pavements. Taken from the ground in Quarries. Good- new jobs, Bad - fewer tourists, traffic, noise, visual, atmospheric. |
| Still limestone | Lime stone -> (heat with clay) Cement -> Mix with sand to make mortar, or-> With sand and aggregate to make concrete. |
| Calcium carbonate chemistry | Many metal carbonates break down when heated. (Thermal decomposition) Metal carbonate -->metal oxide = carbon dioxide ((CaCO3 --> CaO+CO2) |
| Still calcium carbonate chemistry | Calcium oxide reacts vigorously with drops of water to make a white solid calcium hydroxide. (CaO + H2O -->Ca (OH)2) A lot of heat is given out. Calcium hydroxide is an alkali. Alkalis dissolve in H2O an neutralise acids. |
| Still calcium carbonate chemistry | Lime water is a solution of calcium hydroxide and water. Its used as a test for carbon dioxide. CO2 turns lime water cloudy. Calcium hydroxide + carbon dioxide --> calcium carbonate and water. |
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