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19 Cards in this Set
- Front
- Back
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Relative mass of protons electrons and neutrons? |
Proton: 1 Neutron: 1 Electron: Nearly nothing |
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Isotopes |
Atoms of the same element that have different numbers of neutrons. |
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Radio-isotopes |
Unstable atoms which break down giving radiation. |
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Medical Use of radioisotopes |
Cancer treatment (radiotherapy) using Cobalt-60 |
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Industrial Use of radioisotopes |
To check for leaks using a Geiger counter |
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Element |
Substance that can't be split into anything simpler. Each element has a unique proton no. |
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Mixtures |
Two or more elements mixed together but not chemically combined. |
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Compounds |
Two or more elements mixed together and are chemically combined. |
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Alloy |
A mixture of ametal with other elements |
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Ionic bond |
-An ionic compound has a regular arrangement lattice of alternating positive and negative ions. |
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Describe the differences in volatility between ionic and covalentcompounds |
Ionic - Low Covalent - High |
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Describe the differences in solubility between ionic and covalentcompounds |
Ionic - Usually soluble Covalent - Majority don't dissolve |
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Describe the differences in electrical conductivity between ionic and covalentcompounds |
Ionic - Conduct when melted or dissolved Covalent - Don't conduct electricity |
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Diamond |
-Has 4 bonds -Don't conduct electricity -Used for cutting -High M.P. -Hard -Hardest known substance |
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Graphite |
-3 Bonds -Made of flat sheets that are held together by weak forces (used as a lubricant). -Conducts electricity -Slippery due to weak bonds |
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Silicon (lV) Oxide |
-Makes up most of sand -Each silicon atom is bonded to 4 oxygen atoms. Each oxygen atom is bonded to 2 silicon atom -High melting poin -Hard |
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Metallic Bonding |
A latticeof positive ions in a ‘sea of electrons’ |
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Metals are malleable and ductile ... |
-Layers of ions can slide over each other |
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Metals are good conductors... |
-Free electrons take energy |
