To celebrate the 30th year of the Avogadro Exam we are reprinting questions from the first exam in 1988 in this and upcoming issues. The exam was, and is, aimed at grade 11 chemistry students. Consider registering your students to write the 2017 Avogadro Exam https://uwaterloo.ca/chemistry/exams in May 2017.
- Which substance, when treated with acidic water, would NOT generate hydrogen gas?
- Cesium metal
- Lithium hydride
- Magnesium metal
- Calcium carbide
- Potassium metal
- Complete oxidation of tin metal will produce the compound
- SnO
- Sn2O3
- SnO2
- Sn2O5
- SnO3
- What percentage of the mass of monodeuterobenzene, C6H5D, is made up of deuterium (D stands for deuterium). Atomic weights H= 1.0, X=2.0 and C=12.0.
- 1.3%
- 2.0%
- 2.5%
- 8.3%
- 97%
- Which solution is most highly coloured?
- NaBr (aq)
- MgCl2 (aq)
- H3PO4 (aq)
- Ba(OH)2 (aq)
- Cu(NO3)2 (aq)
- What mass of oxygen, O2, will be consumed as 100 g of iron is converted into iron(III) oxide? O=16.00, Fe=55.85 .
- A 9.6 g
- 43.0 g
- 85.9 g
- 100 g
- 233 g
- The general formula for the binary hydrogen compounds of the elements, E, of the nitrogen family, is
- EH5
- E2H3
- EH
- EH2
- EH3
- A water solution contains 15.002 g of compound Y per litre of solution. When 25.00 mL of this solution is treated with an excess of silver nitrate, all of the chlorine in compound Y is precipitated, to give 0.500 g dry AgCl. What was the percentage by weight of chlorine in Y? Cl=35.45, Ag=107.87.
- 0.82%
- 9.89%
- 25.3%
- 33.0%
- 38.7%
- How many moles of Br2 will react with one mole of aqueous Fe2+?
- 1/3 mol
- 1/2 mol
- 1 mol
- 3/2 mol
- 2 mol
- Which one of the following is the most soluble in water at 25 degrees Celsius?
- KBr
- BaSO4
- Ca3(PO4)2
- Mg(OH)2
- AgCl
- What volume of concentrated nitric acid (70.0%) HNO3 ; density 1.42 g/mL) should be taken to prepare 750 mL of 0.500 mol/L aqueous nitric acid? H=1.01, N=14.01, O=16.00
- 79.0 mL
- 45.3 mL
- 33.9 mL
- 23.8 mL
- 7.9 mL
