Chemical Measurements Worksheet
A Grade 12 Chemistry worksheet focusing on accurate chemical measurements, including stoichiometry, significant figures, and concentration calculations.
Includes
Standards
Chemical Measurements
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Date:
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Read each question carefully and provide accurate answers. Show all your work for calculations.
1. Which of the following is the most appropriate glassware for precisely measuring 25.00 mL of a solution?
Beaker
Erlenmeyer flask
Graduated cylinder
Volumetric pipette
2. How many significant figures are in the measurement 0.00340 g?
2
3
4
5
3. The molarity of a solution is defined as the number of moles of solute per of solution.
4. When diluting a concentrated acid, always add the to the slowly.
5. Calculate the molar mass of sulfuric acid (H₂SO₄). (Atomic masses: H=1.01 g/mol, S=32.07 g/mol, O=16.00 g/mol)
6. Describe the process of preparing a standard solution of sodium carbonate from a primary standard.
7. A percentage error calculation indicates the accuracy of a measurement.
True
False
8. Precision refers to how close a measured value is to the true value.
True
False
9. A student needs to prepare 500.0 mL of a 0.250 M solution of NaCl. What mass of NaCl (molar mass = 58.44 g/mol) is required?
10. In a titration, 25.00 mL of an unknown concentration of HCl is neutralized by 35.20 mL of 0.150 M NaOH. Calculate the concentration of the HCl solution.