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36 Cards in this Set
- Front
- Back
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who developed atomic theory? |
Dalton- atom JJ Thompson - plum pudding Rutherford - (guiger and marsden) nucleus Bohr- shells |
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mass of electrons
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1/1800 -- negligible
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isotopes
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same proton number different neutron (atomic) number
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period
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how many shells
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group number
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electrons in outer shell
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properties of ionic compounds
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high mp / bp. ionic lattices. canr conduct as a solid but can when dissolved or melted
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metals form what ions
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cations positively charged
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non metals form what ions
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negatively charged anions
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group 4 can only bond..
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covalently
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more charged ions have a higher mp/bp as they are
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more difficult to melt
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what was newlands periodic table like?
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masses. octaves. 2 in 1 space. no noble gases
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what was mendeleevs periodic table like?
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gaps. hydrogen alone. no noble gases. gaps and predictions
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properties of the group 1 metals
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good conductor. soft (can be cut with a knife). low density
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group 1 metal + water ▶
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metal hydroxide and hydrogen
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when group 1 metal hydroxides are dissolved in water they are
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alkaline solutions
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no hes 1 so hes 2 poo hes 3 coos hes 2 oh hes 1
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NO3 -1
SO4- 2 PO4- 3 CO3 - 2 OH - 1 |
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the group 7 elements get more... and .... as you go down
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dark and less reactive
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halogens (grp 7) + grp 1 metals |
ide ions-- redox reaction |
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how do we teat dor halogen reactivity
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potassium halide + halogen -- displacement
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properties of transition metals
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metallic lattices. variable oxidation state. high mp/bp. catalysts. coloured compounds. high density. shiny and strong
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metal carbonates thermally decompose to form..
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metal oxide + co2
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what is used to identify transition metal sulphates
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naoh
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how are transition metals used as catalysts
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iron- haber process
nickel - margerine |
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properties of metals
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shiny. hard. ductile. high mp / bp. good conductor.
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why is iron used in cars/bridges
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strong and high tensile strength
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why is copper used in wiring
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conductivity
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properties of alloys
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worse conductors. less malleable. stronger and harder.
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what are superconductors?
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at v low temperatures some metals have no electical resistance
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benefits of super conductors
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power transmission without loss. super fast circuits. powerful electromagnets
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drawbacks of super conductors
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expensive and difficult
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what are uses of water
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domestic. coolant. solvent.
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what are uk sources of water
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aquifers. lakes rivers. reservoir.
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how is our water polluted?
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Lead ▶ pipes
nitrates ▶ soluble and fertiliser pesticides ▶ farmers |
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what are the three stages of water purification
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filtration- sedimentation - chlorination
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what is used to identify sulphates
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barium chloride
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what is used to identify halide ions
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silver nitrate
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