Showing posts from April, 2021
Activity 2.15 Heat a few crystals of copper sulphate in a dry boiling tube. What is the colour of the copper sulphate after heating? ✅ Answer: White. Do you notice water droplets in the boiling tube? Where have these come fro…
Activity 2.14 Collect the following salt samples – sodium chloride, potassium nitrate, aluminium chloride, zinc sulphate, copper sulphate, sodium acetate, sodium carbonate and sodium hydrogen carbonate (some other salts available…
Activity 2.13 Write the chemical formulae of the salts given below. Potassium sulphate, sodium sulphate, calcium sulphate, magnesium sulphate, copper sulphate, sodium chloride, sodium nitrate, sodium carbonate and ammonium chl…
Activity 2.12 Put about 2 g soil in a test tube and add 5 mL water to it. Shake the contents of the test tube. Filter the contents and collect the filtrate in a test tube. Check the pH of this filtrate with the help of univers…
Activity 2.11 Test the pH values of solutions given in Table 2.2. Record your observations. What is the nature of each substance on the basis of your observations? Solution Colour of pH paper Approxima…
