Track quiz
Seven quick questions, one for each lesson. Use the table if you get stuck.
| Idea | Remember |
|---|---|
| The shelf again | Blue turning red names an acid. Red turning blue names a base. Neither strip moving names a neutral substance. |
| What acids share | Every acid frees H⁺ ions in water. A base that dissolves in water frees OH⁻ ions. |
| Metals and carbonates | A dilute acid with a reactive metal gives a salt and hydrogen. An acid with a carbonate gives a salt, water and carbon dioxide. |
| The pH scale | Usually, pH runs from 0 to 14. Below 7 is acidic, 7 is neutral, above 7 is basic. A lower pH means more H⁺. |
| Living windows | A living thing keeps its own narrow pH window. One reading can be fine in one place. It can be trouble in another. |
| Neutralisation | An acid and a base give a salt and water. The same two solutions always neutralise in the same ratio. |
| Crystals with water | Heat drives the crystal's held water out and leaves a different substance. Adding water brings the first substance back. |
A liquid leaves the blue strip blue. It turns the red strip blue. What is it?
Glucose has hydrogen in its formula. Why is it not an acid?
Baking soda fizzes in dilute acid. The gas is tested. Which gas is it?
Solution P has pH 2. Solution Q has pH 5. Which has more H⁺ ions?
After sweets, a mouth reads pH 5.2. What can happen?
6 mL of acid neutralises 9 mL of a base. How much acid neutralises 18 mL of that base?
Blue crystals turn white on heating. Water turns them blue again. What did the heat drive out?
Chapter 2 is in your Class 10 book, Science. It is Acids, Bases and Salts. It goes further into each idea.
Next comes Metals and Non-metals. It opens with the same shelf.