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# Preliminary chemistry

## Module 2 | Metals

### Focus 4: For efficient resource use, industrial chemical reactions must use measured amounts of each reactant

#### Lesson 1 | The Mole

• Define the mole as the number of atoms in exactly 12g of carbon-12 (Avogadro’s number)

• Solve problems and analyse information from secondary sources to perform calculations involving Avogadro’s number and the equation for calculating the number of moles of a substance:

#### Lesson 2 | Mole theory

• Describe the contribution of Gay Lussac to the understanding of gaseous reactions and apply this to an understanding of the mole concept.

• Recount Avogadro’s law and describe its importance in developing the mole concept.

#### Lesson 3 | Moles and chemical equations

• Compare mass changes in samples of metals when they combine with oxygen.

• Process information from secondary sources to interpret balanced chemical equations in terms of mole.

• Process information from secondary sources to investigate the relationship between the volumes of gases involved in reactions involving a metal and relate this to an understanding of the mole.

#### Lesson 4 | Empirical and molecular formulae

• Distinguish between empirical formulae and molecular formulae.

• Perform a first-hand investigation to measure and identify the mass ratios of metal to non-metal(s) in a common compound and calculate its empirical formula.

• ### 60 Lessons

Lessons by expert teachers that cover the NSW Preliminary Chemistry Syllabus comprehensively.

• ### 60 Practice questions

60 lesson quizzes that include a variety of questions. This course also includes 20 focus level and 4 module level tests, as well as a comprehensive end of course practice exam.

• ### 51 Hours of video

Videos that fully explain complex chemistry questions through animation, practical experiments, and tutorials.

• ### 21 Interactive activities

Interactive activities that help you explore and understand key syllabus dot point as well as additional resources such as an interactive Periodic Table.