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26 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Define relative atomic mass |
The Ar of an element is the mass of one of its atoms relative to 1/12th the mass of a C-12 atom |
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Define relative molecular mass |
The Mr of a molecule is the mass of the whole molecule relative to 1/12th the mass of one C-12 atom |
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What’s molar mass |
The mass of one mole of an element/compound |
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What’s meant by 1/12th of an atom of C-12 |
A proton’s mass |
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What’s molecular formula |
How many atoms of each element are found in a compound |
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What’s molecular formula |
How many atoms of each element are found in a compound |
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Define empirical formula |
The formula which represents the compound of its most reduced whole number ratio of atoms |
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What does hydrated mean |
The compound contains water of crystallization |
Eg CuSO4.5H2O |
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What does hydrated mean |
The compound contains water of crystallization |
Eg CuSO4.5H2O |
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What does anhydrous mean |
Compound doesn’t contain water of crystallization |
Eg CuSO4 |
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What are stoichiometric amounts |
The big numbers in chemical equations |
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Define percentage yield |
“The effectiveness of a synthetic procedure” |
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Define percentage yield |
“The effectiveness of a synthetic procedure” |
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3 reasons why 100% yield is not possible |
- by-products as a result of the reaction may form - some reactants may remain unreacted - some product may be lost (eg gas escaping) |
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Equation for atom economy |
Mr of desired product \ Mr of sum of all products (x100) |
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What’s the molar volume of ANY GAS at RTP |
24dm3 |
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What’s the molar volume of ANY GAS at RTP |
24dm3 |
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What’s the molar volume of ANY GAS at STP |
22.4dm3 |
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What’s the temp and pressure on STP |
Temp - 0C (273K) Pressure - 1 atm (100kPa) Molar volume - 22.4dm3 |
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What’s the temp and pressure in RTP |
Temp - 25C (298K) Pressure - 1 atm (100kPa) Molar volume - 24dm3 |
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What is a molar volume |
The volume of one mole of the gas |
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What is a molar volume |
The volume of one mole of the gas |
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How much volume would - 1 mole of O2, N2, CO2 (RTP) - 2 moles of O2, N2, CO2 (RTP) - 0.25 moles of O2, N2, CO2 (RTP) - all of the above at STP
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- 24dm3 - 48dm3 - 6dm3 - 22.4dm3 - 44.8dm3 - 11.2dm3 |
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What’s the ideal gas equation |
pV = nRT |
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Which three scientists discovered the gas laws |
Robert Boyle Jacques Charles Joseph Gay-Lusaac |
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What three things does volume of gas depend on |
1) temperature 2) pressure 3) amount of the gas (in moles) |
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