Grade 10 CBC/CBE Chemistry: Write Any Chemical Formula in 3 Checks

Where do the small numbers in CaCl₂ and Al₂O₃ come from? In this Grade 10 CBC Chemistry lesson you will write the formula of any common compound by making the charges on its ions cancel. You will use the lowest common multiple and the swap shortcut, put radicals in brackets only when you need to, write formulae for metals with Roman numerals, count the atoms in a formula and spot common errors, all with three simple checks. FREE REVISION PAPER FOR THIS LESSON. Paper 1: Core concepts Download them here: https://drive.google.com/file/d/13v-x... IN THIS VIDEO 0:00 Hook and title 0:28 In this video 1:02 Why the charges must cancel 1:36 Equal charges: NaCl and MgO 2:03 Unequal charges: MgCl₂ 2:32 Different sizes: Al₂O₃ 3:12 A shortcut, and the simplest ratio 3:43 Your turn: simple ions 4:24 Radicals need brackets 4:58 When to use brackets 5:27 Worked example: aluminium sulphate 6:00 Your turn: radicals 6:42 Metals with a Roman numeral 7:20 Your turn: iron(III) compounds 8:05 Counting the atoms in a formula 8:39 From formula to name 9:08 Spot the error 9:52 Your turn: correct the formula 10:43 Watch out for these mistakes 11:46 What to remember 12:18 Challenge and next video YOUR CHALLENGE Write the formula of ammonium phosphate. Then count how many atoms of each element it contains. Write your answer in the comments. PREVIOUS VIDEO Video 2: Valency and oxidation numbers :    • Grade 10 CBC/CBE Chemistry: Valency, and O...   NEXT VIDEO Video 4: Writing and balancing equations. We use formulae to write and balance chemical equations. ABOUT SP-SciLearn SP-SciLearn makes paced, interactive science lessons for Kenyan learners following the CBC. Every video stops so that you can try a question yourself before the answer appears. Subscribe and turn on notifications so that you do not miss the next lesson. Grade 10 CBC Chemistry · 1.3 The Periodic Table #Grade10Chemistry #CBCKenya #Chemistry