What were the conclusions to the results of Ernest Rutherford's experiment?
-Most particles went straight through as the atom is mainly empty space -A few were deflected as they came near the nucleus and were repelled. The nucleus must be positive and small-Very few reflected showing that the nucleus is dense and has a mass
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What did Niels Bohr contribute to the atomic theory?
-He created the concept that electrons orbit the nucleus at a set distance in energy shells
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What did James Chadwick contribute to the atomic theory?
-He identified that neutrons are present in the nucleus
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What is the plum pudding model and who created it?
-It suggests that electrons are randomly spaced in a positive cloud -JJ Thompson created it
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What is the radius of an atom?
0.1nm
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What are the properties of giant ionic structures?
-Metal+Non-metal -Transferred electrons -High m.p and b.p as there are lots of strong ionic bonds which need lots of energy to break -Don't conduct as a solid but do when molten or in solution as the ionic bonds break and the ions can carry a charge
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What are the properties of simple covalent molecules?
-Non-metal + Non-metal -Shared electrons -Don't conduct as there are no free electrons or ions -Low m.p and b.p due to weak intermolecular forces which require little energy to break
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What are the properties of metallic structures?
-Metal + Metal -Conducts very well due to lots of delocalised electrons -High m.p and b.p due to lots of strong metallic bonds -Malleable as it has layers which are able to slide
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What are the properties of fullerenes?
-Cage structures made of carbon -Good lubricants, soft and slippery as they are able to roll -High conductivity due to delocalised electrons -Good catalysts due to a large surface area to volume ratio
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Is Zn -> Zn2+, oxidation or reduction ?
Oxidation, it has lost 2 negatively charged electrons leaving it with a positive charge
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What does the current and potential graph of a diode and lamp show?
-The the current in a diode only flows one way( the one opposite way to the high p.d) -The resistance on a lamp increases as the temperature increases
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What is the size of a nanoparticle?
Between 1x10-7 and 2.5x10-6m
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How do you convert from cm3 to dm3?
÷1000
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What is 1kg/m3 in g/cm3?
0.001 (÷1000)
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Other cards in this set
Card 2
Front
What did Niels Bohr contribute to the atomic theory?
Back
-He created the concept that electrons orbit the nucleus at a set distance in energy shells
Card 3
Front
What did James Chadwick contribute to the atomic theory?
Back
Card 4
Front
What is the plum pudding model and who created it?
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