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|[All of these]
 
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|How many moles of sodium atoms (Aᵣ = 23) make a mass of 4.6g?
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|Moles (n) = mass (m) / atomic mass (Ar) = 4.6 / 23 = 0.2 mol
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|The limiting reactant is ---(1)--- and is ---(2)--- at the end of the reaction.
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|1: not in excess; 2: all used up
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|Which of these statements about CHEMICAL REACTIONS is TRUE?
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|NO atoms are created or destroyed, so total MASS STAYS THE SAME
 
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Latest revision as of 22:44, January 11, 2018

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Questions Answers
Masses of REACTANTS and PRODUCTS can be… calculated from BALANCED symbol equations
A single mole of a particular substance will contain how many of its constituent particles? 6.022 x 10²³ (the AVOGADRO constant)
100g of ALUMINIUM OXIDE contains 47g of OXYGEN, how is this calculated? Mass of oxygen = total mass - mass of aluminium
What is the formula for calculating THEORETICAL YIELD? (ACTUAL yield / PERCENTAGE yield) x 100
When the MOLTEN STATE of PbBr₂, an IONIC compound, is electrolysed using INERT electrodes, the ---(1)--- is produced at the NEGATIVE---(2)---. 1: metal (lead); 2: cathode
The formula to calculate ATOM ECONOMY is… (molar mass of WANTED product) / (molar mass of TOTAL products)) x 100
When the MOLTEN STATE of PbBr₂, an IONIC compound, is electrolysed using INERT electrodes, the ---(1)--- is produced at the NEGATIVE---(2)---. 1: metal (lead); 2: cathode
What VOLUME (dm³) would 5g of water vapour take up, at room temperature and pressure? (5/18) x 24 = 6.67 dm³
Reaction pathways with HIGH YIELDS and ATOM ECONOMY may not be chosen in industry because… [All of these]
How many moles of sodium atoms (Aᵣ = 23) make a mass of 4.6g? Moles (n) = mass (m) / atomic mass (Ar) = 4.6 / 23 = 0.2 mol
The limiting reactant is ---(1)--- and is ---(2)--- at the end of the reaction. 1: not in excess; 2: all used up
Which of these statements about CHEMICAL REACTIONS is TRUE? NO atoms are created or destroyed, so total MASS STAYS THE SAME
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