For those of you who are wanting a few practice problems for the weekend before the test on Monday (Feb 27), use the link below. It will direct you to a new website with practice problems, hints, and  answers.

Do the following practice problems:

Moles: 1a, 1b, 1c, 2a, 2b, 2c, 3, and 5

Chemical Formulas: 1, 2, 3, 4, 6, 7a, and 7b.

PRACTICE HERE!

Unit 5 - Counting Particles Too Small to See

Instructional goals

1. Use Avogadro's Hypothesis and experimental data to determine the relative mass of molecules.

2. Use experimental data to determine the number of items in a sample without actually counting them.

3. Use experimental data to determine the molar mass of elements.

4. Given the chemical formula of a substance, determine the molar mass.

5. Given the mass of a substance, determine

a. the number of moles of the sample

b. the number of atoms or molecules in the sample

6. Given the number of moles of a substance, find

a. the mass of the sample

b. the number of atoms or molecules in the sample

7. Given the formula of a compound, determine its % composition.

8. Given data about the % composition of a sample, determine the empirical formula of the compound.

9. Given the empirical formula and information about the molar mass of the compound, determine the molecular formula.

 

Unit 5 Tutorials 

Unit 5 Documents

Unit 5 WS1: Molar Masses of Elements

Unit 5 Notes Worksheet

Unit 5 Student Reading for Notes

Unit 5: Size of Mole WS

Unit 5 WS 2: Molar Mass, Moles, and Molecules

Unit 5 WS 3: Empirical and Molecular Formulas

Unit 5 Review WS