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Tutor HuntTest QuestionsChemistry QuestionsYear 10 Chemistry Questions

 

Chemical Measurements (GCSE Chemistry)

The following is a GCSE Chemistry test covering 'Chemical Measurements' from the broader topic Quantitative Chemistry. The test is geared towards the AQA exam board style syllabus.
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Why is an Rf value unaffected by how far the solvent front is allowed to travel?
Which calculation gives the number of moles of gas in 24.0 dm3 at RTP?
A dye has Rf = distance dye / distance solvent. If distance dye = 4.8 cm and solvent = 12.0 cm, what is the Rf?
How many C70 molecules can be made from one mole of carbon atoms? (Avogadro’s constant = 6.02 × 10^23)
A dye had Rf = 0.48 and the dye moved 5.4 cm from the start line. How far did the solvent front move?
What volume (in dm3) of any gas at room temperature and pressure is produced by 0.500 mol of the gas? (Use 1 mol = 24 dm3)
Calculate the relative formula mass (Mr) of calcium carbonate, CaCO3 (Ar: Ca = 40.1, C = 12.0, O = 16.0).
For the Haber process: N2 + 3H2 ? 2NH3. What is the atom economy for producing ammonia (mass of desired product ÷ mass of reactants ×100)?
What percentage by mass of nitrogen is in ammonium nitrate, NH4NO3? (Ar: N = 14.0, H = 1.0, O = 16.0)
A solution contains 35.2 g/dm3 NaCl. If sodium is 39.3% by mass of NaCl, what is the mass concentration of sodium ions in g/dm3?
Which of the following is the correct expression for percentage yield?