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- 1. Multiple-choice30 seconds1 pt
The equation shows the reaction between magnesium and sulfuric acid.
[Ar: H, 1; O, 16; Mg, 24; S, 32]
Mg + H2SO4 → MgSO4 + H2
In this reaction, which mass of magnesium sulfate is formed when 6 g of magnesium react with excess sulfuric acid?
A 8
B 24
C 30
D 60
- 2. Multiple-choice30 seconds1 pt
Two atoms of magnesium, Mg, react with one molecule of oxygen, O2.
What is the formula of the product?
A MgO
B MgO2
C Mg2O
D Mg2O2
- 3. Multiple-choice30 seconds1 pt
What is the relative molecular mass (Mr) of HNO3?
A 5
B 31
C 32
D 63
- 4. Multiple-choice30 seconds1 pt
The relative formula mass, Mr, of copper(II) sulfate, CuSO4, is 160.
Which mass of sulfur is present in 160 g of copper(II)sulfate?
A 16 g
B 32 g
C 64 g
D 128 g
- 5. Multiple-choice30 seconds1 pt
A compound has the formula CH3CO2H.
How should the relative molecular mass, Mr, of this compound be calculated?
A 12 + 1 + 16
B 3(12 + 1) + 2(12 + 16) + 1
C (4 × 12) + (2 × 1) + 16
D (2 × 12) + (4 × 1) + (2 × 16)
- 6. Multiple-choice30 seconds1 pt
he equation shows the reaction between magnesium and sulfuric acid.
Mg + H2SO4 → MgSO4 + H2
(Mg = 24, H = 1, S = 32, O = 16)
In this reaction, what mass of magnesium sulfate will be formed when 6 g of magnesium reacts with excess sulfuric acid?
A 8
B 24
C 30
D 60
- 7. Multiple-choice30 seconds1 pt
Which relative molecular mass, Mr, is not correct for the molecule given?
A
B
C
D
- 8. Multiple-choice30 seconds1 pt
The structure of an organic compound, X, is shown.
What is the molecular formula of X?
A C6H9
B C6H12
C C7H12
D C7H14
- 9. Multiple-choice30 seconds1 ptKNO3 --> KNO2 + O2
What coefficients are needed to balance the reaction?2, 2, 12, 3, 21, 2, 21, 3, 1 - 10. Multiple-choice30 seconds1 ptWO3 + H2 --> W + H2O
What coefficient goes in front of H2?1234 - 11. Multiple-choice30 seconds1 ptThe equation for Percent Yield:(predicted/experimental) X 100(experimental/predicted) X 100(experimental - predicted)/ Predicted X 100
- 12. Multiple-choice45 seconds1 ptYou need 2 pieces of bread, 1 tablespoon of peanut butter and 2 tablespoons of jelly to make a sandwich. If you have 10 pieces of bread, 4 tablespoons of peanut butter and 20 tablespoons of jelly, what is the limiting reactant?breadjellypeanut buttersandwich
- 13. Multiple-choice30 seconds1 ptFor the Balanced Reaction: 3 Mg + 1 Fe2O3 → 3 MgO + 2 Fe; What is the Ratio of moles of Mg to moles Fe?3mol Mg / 2 mol Fe2 mol Mg/ 3 mol Fe1 mol Fe/ 2 mol Fe3 mol MgO / 2 mol Fe
- 14. Multiple-choice30 seconds1 ptWhen does a chemical reaction stop?When the lab is finishedWhen the excess reactant is used upWhen the limiting reactant is used upChemical reactions never stop
- 15. Multiple-choice30 seconds1 ptThe Formula to make S'mores is:
2C + 1M + G2 → C2MG2. If you have 5 Marshmallows (M), 9 Chocolate Pieces (C), and 9 Graham Cracker Halves (G), how many S'mores can you make?54842 - 16. Multiple-choice2 minutes1 ptIf a chemist calculates the maximum amount of product that could be obtained in a chemical reaction, he or she is calculating thetheoretical yieldmole ratioactual yieldpercentage yield
- 17. Multiple-choice2 minutes1 ptWhat is the measured amount of a product obtained from a chemical reaction?mole ratiotheoretical yieldpercentage yieldactual yield
- 18. Multiple-choice5 minutes1 ptFor the reaction represented by the equation Cl2 + 2KBr → Br2 + 2KCl, how many grams of potassium chloride can be produced from 356 grams potassium bromide?749 g225 g479 g814 g
- 19. Multiple-choice30 seconds1 ptN2 + 3H2 → 2NH3
How many moles of hydrogen are needed to react with 2 moles of nitrogen?6231 - 20. Multiple-choice15 minutes1 ptUse the following equation:
NaIO3(aq) + 6HI(aq) --> 3I2(s) + NaI(aq) + 3H2O(l)
How many moles of iodine can be made from 6.55 moles of NaIO3?4.55 moles I223.18 moles I219.65 moles I234.99 moles I2
