Science

Chemical Tests
Lesson 4 Testing Unknown Solids with Water - Water Test
Solid	All matters exist in four states: Solid, Liquid, Gas and Plasma. Diamond, Water, Helium and Star (cluster of charged particles) are their examples. Do you know more examples? Nature gives us many solids with different properties. How do we find out what is what? By observing, measuring or testing their properties, right?!
Water & Water Test	Water is a solvent (liquid dissolves solid). Water is made of two hydrogen atoms and one oxygen atom with a simple formula, H₂O. Some solids can be dissolved in water and some can't. So we can use water to test whether an 'unknown' solid is soluble in water or not. Can we use a water test to find out other properties of solids?
Classification of Solids	Water Soluble Solids versus Water Insoluble Solids (Remember? Separating out the 'known' things into different groups and giving them a name is called classification)
Types of Solids determined by other chemical & X-ray tests	By chemical nature: Organic Solid versus Inorganic Solid, By category: Metal, Ceramic and Polymer, By structure: Crystalline Solid (single crystal vs polymorphs vs crystalline with defects) versus Non-Crystalline (polymeric chained vs amorphous) By phase (single phase - metal, alloy, ceramic, polymer vs multiphase - mixture vs composite). Just keep an example in mind makes these strange words simple.
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What to learn? Water Test and properties of 'unknown' solids How? 1. Use the above tools to do a water test on your 'unknown' solids. (Use senses to observe and note down what you see) 2. Discuss with class/team on the observed facts from the water test and enter them into your test result tables for each 'unknown' chemicals. 3. Make a prediction on the 'unknown' solids (Use teacher's class prediction table to record your prediction) 4. Think about what other tests can find out more about the 'unknown' solids.