Science Class 8
Nature of Matter: Elements, Compounds, and Mixtures
Sort any substance into element, compound or mixture, and say why.
18 lessons · ~103 min total
Track progress — 0 of 18 lessons read 0%
Lessons in this topic
- 0 Start here A roadmap: how many kinds of matter there are, and the tests that tell them apart. · 3 min You are here
- 1 What pure means here In science, a pure substance is one kind of matter. Two or more substances make a mixture. · 6 min
- 2 Substances that will not come apart An element is a substance that cannot be broken into simpler substances. · 6 min
- 3 An agreed short name Every element has one agreed symbol: a capital letter, then a small one if needed. · 6 min
- 4 Joined in a fixed ratio Elements join in a fixed ratio to make a compound with new properties. · 6 min
- 5 Together, but not joined A mixture has substances together, not joined. They do not react with each other. · 6 min
- 6 Trying to get the parts back A mixture can be separated by physical methods. A compound cannot, because its elements are joined. · 6 min
- 7 Sorting everyday things into piles Count the substances first. Then ask if anything simpler comes out. · 6 min
- 8 Atoms joined as one particle A molecule is joined atoms. Its kinds of atom show element or compound. · 6 min
- 9 Which states are mixed? Sort a two-part mixture by the state each part has alone. · 6 min
- 10 Checkpoint: molecules and mixtures A graded check on atoms in molecules and states in mixtures. · 5 min
- 11 Between a metal and a non-metal Silicon and boron sit between metals and non-metals. · 6 min
- 12 Minerals from the ground Most minerals are compounds. A few, called native, are pure elements. · 6 min
- 13 Same acid, different gas Dilute acid gives one gas with iron and another with iron sulfide. · 7 min
- 14 What counts as matter? Matter has mass and takes up space. Light and heat do not. · 6 min
- 15 Checkpoint: metalloids, minerals, the acid test and matter A graded check on metalloids, minerals, the acid test and matter. · 5 min
- 16 The big picture Thirteen ideas about matter, on one screen. · 4 min
- 17 Track quiz Thirteen rules about matter, then fourteen questions. · 7 min
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