High School (9–10) Chemistry

How many atoms are in a gram of carbon dioxide? Why do $1\ \text{g}$ of hydrogen and $16\ \text{g}$ of oxygen hold exactly the same number of atoms? How long would it take to count the molecules in one drop of water? In this workshop you learn two strategies, and then you solve problems that are a step harder than the chapter, with Python to check your work.

Why does the pH scale go in steps of ten? Why is vinegar a weak acid and hydrochloric acid a strong one, when both turn litmus red? How does a chemist find the strength of an unknown alkali with a burette? In this course you read further, solve problems on pH, dilution and titration, and then take a timed challenge.

The chapter gave you the rules. Here you use them together. How many structures can a formula have? Which compound has these percentages? How much carbon dioxide does a fuel make, and how much soap is lost? In this course you learn two strategies and then solve harder problems, in the style of an olympiad.

A reactivity series is a list. An ore calculation is a few lines of arithmetic. In this course you turn the chemistry of metals into short Python programs, and you use them to test ideas: which metals displace which, which ore is the richest, and how much alloy you need. Then you take a timed test in the style of an olympiad.

In an exam, chemical equations are worth easy marks, if you are quick and you check your work. This pack gives you two exam skills, six problems, a Python checker for your balancing, and timed papers. One paper is in the Standard pack, and a longer one with worked solutions is for Premium.

You know how the table is built and how it is used. Now ask why. Why did Moseley's X-rays settle an old argument? Why does the energy to remove an electron dip twice in each period? In this course we read further, solve harder problems and take an olympiad style test.