Date | November 2018 | Marks available | 1 | Reference code | 18N.1.sl.TZ0.3 |
Level | SL | Paper | 1 | Time zone | TZ0 |
Command term | Question number | 3 | Adapted from | N/A |
Question
16 g of bromine react with 5.2 g of metal, M, to form MBr2. What is the relative atomic mass of the metal M? (Ar : Br = 80)
A. 13
B. 26
C. 52
D. 104
Markscheme
C
Examiners report
Syllabus sections
- 18M.1.sl.TZ1.2: What is the molecular formula of a hydrocarbon containing 84.6% carbon by mass with a molar...
- 18M.1.sl.TZ2.2: What is the number of atoms of oxygen in 2.0 mol of hydrated sodium carbonate, Na2CO3•10H2O?...
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17N.1.hl.TZ0.2:
Which solution neutralizes 50.0 cm3 of 0.120 mol dm–3 NaOH (aq)?
A. 12.5 cm3 of 0.080 mol dm–3 H3PO4
B. 25.0 cm3 of 0.120 mol dm–3 CH3COOH
C. 25.0 cm3 of 0.120 mol dm–3 H2SO4
D. 50.0 cm3 of 0.060 mol dm–3 HNO3
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22M.2.hl.TZ1.1b(i):
Calculate the amount of magnesium, in mol, that was used.
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22M.1.hl.TZ1.2:
0.02 mol of zinc is added to 10.0 cm3 of 1.0 mol dm–3 hydrochloric acid.
Zn (s) + 2HCl (aq) → ZnCl2 (aq) + H2 (g)
How many moles of hydrogen are produced?
A. 0.005
B. 0.01
C. 0.02
D. 0.04
- 22M.1.sl.TZ1.4: 8.8 g of an oxide of nitrogen contains 3.2 g of oxygen. What is the empirical formula of the...
- 22M.1.sl.TZ1.3: What is the molecular formula of a compound with an empirical formula of CHO2 and a...
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17N.1.sl.TZ0.2:
What is the value of x when 32.2 g of Na2SO4•xH2O are heated leaving 14.2 g of anhydrous Na2SO4? Mr(H2O) = 18; Mr(Na2SO4) = 142.
Na2SO4•xH2O (s) → Na2SO4 (s) + xH2O (g)
A. 0.1
B. 1
C. 5
D. 10
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17M.3.hl.TZ1.15d:
The sequence of nitrogenous bases in DNA determines hereditary characteristics.
Calculate the mole percentages of cytosine, guanine and thymine in a double helical DNA structure if it contains 17% adenine by mole.
- 16N.3.sl.TZ0.2c: List two assumptions made in this experiment.
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18M.2.sl.TZ2.1e:
Determine the mass of Mg(OH)2 in the antacid tablet.
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20N.3.sl.TZ0.12:
Consider the following antacids:
Show that antacid X is more effective, per tablet, than antacid Y.
- 16N.3.sl.TZ0.2a: State and explain the further work students need to carry out in trial 2 before they can...
- 17M.1.sl.TZ1.1: Which compound has the greatest percentage by mass of nitrogen atoms? A. N2H4 B. ...
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17M.2.sl.TZ2.7b.ii:
Calculate the molar mass of the acid.
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19M.2.hl.TZ1.4d:
Sodium percarbonate, 2Na2CO3•3H2O2, is an adduct of sodium carbonate and hydrogen peroxide and is used as a cleaning agent.
Mr (2Na2CO3•3H2O2) = 314.04
Calculate the percentage by mass of hydrogen peroxide in sodium percarbonate, giving your answer to two decimal places.
- 19M.1.hl.TZ1.3: What is the empirical formula of a hydrocarbon with 75 % carbon and 25 % hydrogen by...
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18N.2.hl.TZ0.1a.i:
Determine the limiting reactant showing your working.
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18N.1.sl.TZ0.1:
How many moles of FeS2 are required to produce 32 g of SO2? (Ar: S = 32, O = 16)
4FeS2 (s) + 11O2 (g) → 2Fe2O3 (s) + 8SO2 (g)
A. 0.25
B. 0.50
C. 1.0
D. 2.0
- 17N.3.sl.TZ0.8a.i: Determine the empirical formula of linoleic acid.
- 19M.1.sl.TZ1.3: What is the empirical formula of a hydrocarbon with 75 % carbon and 25 % hydrogen by...
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17N.1.sl.TZ0.1:
How many atoms of nitrogen are there in 0.50 mol of (NH4)2CO3?
A. 1
B. 2
C. 3.01 × 1023
D. 6.02 × 1023
- 16N.3.sl.TZ0.18b: Suggest why isolation of the crude product involved the addition of ice-cold water.
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19M.1.sl.TZ2.1:
How many moles of magnesium hydroxide are produced with 0.50 mol of ammonia?
Mg3N2 (s) + 6H2O (l) → 3Mg(OH)2 (aq) + 2NH3 (aq)
A. 0.25
B. 0.33
C. 0.75
D. 1.5
- 21N.1.hl.TZ0.1: How much ethanol contains 1.20 × 1024 atoms of carbon? Avogadro’s constant, L or NA: 6.02 ×...
- 17N.1.hl.TZ0.4: A compound with Mr = 102 contains 58.8 % carbon, 9.80 % hydrogen and 31 % oxygen by mass.What...
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17N.3.sl.TZ0.3c:
Calculate the percentage of water by mass in the NaCl•2H2O crystals. Use the data from section 6 of the data booklet and give your answer to two decimal places.
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18N.2.hl.TZ0.2a:
Determine the empirical formula of the compound, showing your working.
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19N.2.sl.TZ0.6a(ii):
Calculate the total number of moles of gas produced from the decomposition of 10.0 g of guanidinium nitrate.
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19M.2.sl.TZ2.3b(ii):
A sample of gas was enriched to contain 2 % by mass of 15N with the remainder being 14N.
Calculate the relative molecular mass of the resulting N2O.
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19M.1.hl.TZ2.1:
How many moles of magnesium hydroxide are produced with 0.50 mol of ammonia?
Mg3N2 (s) + 6H2O (l) → 3Mg(OH)2 (aq) + 2NH3 (aq)
A. 0.25
B. 0.33
C. 0.75
D. 1.5
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17N.2.hl.TZ0.2d.iii:
Determine the molecular formula of menthol using your answers from parts (d)(i) and (ii).
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17M.1.sl.TZ2.2:
How many moles of oxygen atoms are there in 0.500 mol of hydrated iron(II) ammonium sulfate, (NH4)2Fe(SO4)2•6H2O(s)?
A. 4.00
B. 7.00
C. 8.00
D. 14.00
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17N.1.sl.TZ0.3:
How many grams of sodium azide, NaN3, are needed to produce 68.1 dm3 of N2 (g) at STP?
Molar volume at STP = 22.7 dm3 mol–1; Mr(NaN3) = 65.0
2NaN3 (s) → 3N2 (g) + 2Na (s)
A. 32.5
B. 65.0
C. 130.0
D. 195.0
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17N.2.hl.TZ0.2d.i:
Complete combustion of 0.1595 g of menthol produces 0.4490 g of carbon dioxide and 0.1840 g of water. Determine the empirical formula of the compound showing your working.
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19N.1.sl.TZ0.4:
Which contains the greatest number of moles of oxygen atoms?
A. 0.05 mol Mg(NO3)2
B. 0.05 mol C6H4(NO2)2
C. 0.1 mol H2O
D. 0.1 mol NO2
- 21N.1.sl.TZ0.3: Which combination is correct?
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17M.2.hl.TZ1.6c.i:
One possible product, X, of the reaction of ethane with chlorine has the following composition by mass:
carbon: 24.27%, hydrogen: 4.08%, chlorine: 71.65%
Determine the empirical formula of the product.
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22M.1.sl.TZ1.1:
0.2 mol of sodium hydrogencarbonate is decomposed by heating until constant mass.
2 NaHCO3 (s) → Na2CO3 (s) + H2O (g) + CO2 (g)
How many moles of gas are produced?
A. 0.1
B. 0.2
C. 0.3
D. 0.4
- 22M.1.sl.TZ2.2: 30 g of an organic compound produces 44 g CO2 and 18 g H2O as the only combustion products....
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19M.2.sl.TZ1.4d:
Sodium percarbonate, 2Na2CO3•3H2O2, is an adduct of sodium carbonate and hydrogen peroxide and is used as a cleaning agent.
Mr (2Na2CO3•3H2O2) = 314.04
Calculate the percentage by mass of hydrogen peroxide in sodium percarbonate, giving your answer to two decimal places.
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19M.2.hl.TZ2.3b(ii):
A sample of gas was enriched to contain 2 % by mass of 15N with the remainder being 14N.
Calculate the relative molecular mass of the resulting N2O.
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19M.3.sl.TZ2.3:
Describe the characteristics of the nematic liquid crystal phase and the effect that an electric field has on it.
Shape of molecules:Distribution:
Effect of electric field:
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19M.2.hl.TZ2.4d(ii):
Calculate the percentage, by mass, of rhenium in ReCl3.
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17M.2.sl.TZ1.5c.i:
One possible product, X, of the reaction of ethane with chlorine has the following composition by mass:
carbon: 24.27%, hydrogen: 4.08%, chlorine: 71.65%
Determine the empirical formula of the product.
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17M.2.sl.TZ2.1a.i:
After heating 3.760 g of a silver oxide 3.275 g of silver remained. Determine the empirical formula of AgxOy.
- 21M.1.hl.TZ1.2: A sample of a compound contains approximately 24.0 g C, 3.0 g H, and 1.6 g O. What is the...
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21N.1.sl.TZ0.1:
What is the number of hydrogen atoms in 2.00 moles of Ca(HCO3)2?
Avogadro’s constant, L or NA: 6.02 × 1023 mol−1
A. 2.00
B. 4.00
C. 1.20 × 1024
D. 2.41 × 1024
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18M.3.sl.TZ1.1b.ii:
The solution of palmitic acid had a concentration of 0.0034 mol dm−3. Calculate the number of molecules of palmitic acid present in the 0.050 cm3 drop, using section 2 of the data booklet.
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18M.3.sl.TZ1.1b.iii:
Assuming the sudden change in gradient occurs at 240 cm2, calculate the area, in cm2, that a single molecule of palmitic acid occupies on surface of the water.
If you did not obtain an answer for (b)(ii) use a value of 8.2 × 1016, but this is not the correct answer.
- 21M.1.sl.TZ2.3: Which molecule has the same empirical formula as molecular formula? A. CH3COOH B. ...
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18M.2.sl.TZ1.1a.i:
Calculate the percentage by mass of nitrogen in urea to two decimal places using section 6 of the data booklet.
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19N.2.sl.TZ0.2a(ii):
Calculate the number of moles of oxygen in the day 0 sample.
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17N.2.sl.TZ0.1d.ii:
Calculate the enthalpy change, ΔH, in kJ mol–1, for the reaction between ethanoic acid and sodium hydroxide.
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20N.1.sl.TZ0.2:
What is the number of carbon atoms in of ethanoic acid , ?
A.
B.
C.
D.
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18N.2.sl.TZ0.1a.i:
Determine the limiting reactant showing your working.
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18M.2.hl.TZ1.1a.i:
Calculate the percentage by mass of nitrogen in urea to two decimal places using section 6 of the data booklet.
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20N.1.sl.TZ0.1:
What is the molar mass, in , of a compound if of the compound has a mass of ?
A.
B.
C.
D.
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18N.2.sl.TZ0.2b:
Calculate the number of hydrogen atoms in 1.00 g of propan-2-ol.
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20N.2.sl.TZ0.1e(i):
Calculate the percentage by mass of chlorine in .
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20N.2.hl.TZ0.1e(i):
Calculate the percentage by mass of chlorine in .
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20N.1.sl.TZ0.3:
Which of these molecular formulae are also empirical formulae?
A. I and II only
B. I and III only
C. II and III only
D. I, II and III
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22M.1.hl.TZ1.1:
2.67 g of lead (II) carbonate is decomposed by heating until constant mass.
PbCO3 (s) → PbO (s) + CO2 (g)
What is the final mass of solid?
A. 0.44 g
B. 2.23 g
C. 2.67 g
D. 3.11 g
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22M.2.sl.TZ1.1b(i):
Calculate the amount of magnesium, in mol, that was used.
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17N.2.sl.TZ0.4a:
Complete combustion of 0.1595 g of menthol produces 0.4490 g of carbon dioxide and 0.1840 g of water. Determine the empirical formula of the compound showing your working.
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21N.2.hl.TZ0.1b:
Determine the molecular formula of this compound if its molar mass is 88.12 g mol−1. If you did not obtain an answer in (a) use CS, but this is not the correct answer.
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21N.2.hl.TZ0.1a:
Determine the empirical formula of the compound using section 6 of the data booklet.
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21N.2.sl.TZ0.1b:
Determine the molecular formula of this compound if its molar mass is 88.12 g mol−1. If you did not obtain an answer in (a) use CS, but this is not the correct answer.
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21N.1.hl.TZ0.2:
3.00 mol of C3H8 is mixed with 20.00 mol of O2. Which quantity is present at the end of the reaction?
C3H8 (g) + 5O2 (g) → 3CO2 (g) + 4H2O (g)
A. 1.00 mol of C3H8B. 5.00 mol of O2
C. 12.00 mol of CO2
D. 16.00 mol of H2O
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21N.2.sl.TZ0.1a:
Determine the empirical formula of the compound using section 6 of the data booklet.