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14 Cards in this Set
- Front
- Back
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What number is Avogadro's constant? |
6.23 x1023 (or 6 x1023) |
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What is Avogadro's constant? |
The number of particles in a mole. |
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How many molecules are there in one mole of water? How many atoms? |
6 x1023 molecules 18 x1023 atoms (6 x1023 oxygen, 12 x1023 hydrogen) |
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How many molecules are there in 2.3g of sodium? |
23 g of sodium is 1 mole and therefore 6x1023 atoms Therefore, 2.3g has 0.6x1023 atoms = 6x1022 atoms |
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What is the molar volume of a gas at rtp? |
24dm cubed 24 litres 24000 cm cubed |
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What conditions is rtp? |
25 degrees C 1 atmosphere pressure |
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What is the formula for percentage yield? |
Actual yield / theoretical yield (x 100) |
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What is the formula for percentage change? |
Change / original amount x 100 |
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How many electrons in 1 mole of electrons? |
6 x 10 23 |
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Complete the sentence. 1 _______ is the quantity of electricity which passes if 1 _______ flows for 1 _______. |
Coulomb Amp second |
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How many Coulombs in 1 mole of electrons? What is one mole of electrons called? |
965000 Coulombs Faraday |
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What is the equation linking charge, time and current? |
Charge = current x time |
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If a 1 amp current passes a wire for 4 hours, how many moles of electrons pass? |
4 hours in seconds = 4 x 60 x 60 = 14400 Charge = 1 x 14400 = 14400 Coulombs Moles = 14400 / 965000 = 0.015 moles |
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Mg2+(l) + 2e-à Mg(l)
This is the equation at the cathode of the electrolysis of magnesium. What can we tell about the production of magnesium at the cathode?
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1 mole of Mg ions gains 2 moles of electrons to make 1 mole of Mg. |
