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11 Cards in this Set
- Front
- Back
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Where are metals, metalloids and non-metals found on the Periodic table? |
metals=the left and centre
metalloids=between metals and non-metals on the periodic table with intermediate properties non-metals=on the right |
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Mendeleev ordered elements in groups according to their physical and chemical properties and in order of their atomic mass He left gaps for the undiscovered elements. Elements were put into groups as well as groups. What are the similarities and differences of Mendeleev's table and the modern PT? |
Similarities put into groups and periods Differences Gaps have been filled(no gaps) |
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Groups? |
Elements in the same group all have the same number of electrons in their outside shell. |
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Periods? |
Elements in the same period all have the same number of occupied shells. |
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Compounds definition? |
compounds are formed when atoms of two or more elements combine in fixed proportions.
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Space filler diagrams? |
Help us to understand the formulae of covalent molecules |
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Law of conservation of mass? |
During a chemical reaction no matter can be created or destroyed. |
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Why chemical formulae? |
Elements combine in order to achieve full outer shell. |
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What are the four general acid reactions? |
Acid+Metal =salt+Hydrogen Acid+Metal hydroxide =Salt+Water Acid +Metal oxide =Salt+Water Acid+Metal carbonate =Salt+Water+Carbon Dioxide |
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Preparing crystals of a soluble salt |
Stage1-Excess base/carbonate is added to dilute acid to make sure that is used up and reacted. Gently heating mixture and stirring to help reaction. Stage2-The excess base/carbonate is removed through filtration. Stage3-Salt crystals are obtained from solution through evaporation. Stage4-Additional heat may be required to help obtain crystals. |
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methods for preparing crystals of a soluble salt from the reaction of metals and dilute acids |
Stage1-Excess metal is added to dilute acid to make sure all acid is used up. Gently heating and stirring. Stage2-The excess metal is removed through filtration. Stage3-Salt crystals are obtained from the solution by the process of evaporation. |
