Answers section
Questions 5.2b
- Describe what is observed when calcium metal is added to water. ----------
- Reactions between metals and water produce similar products. Name the products of reaction between calcium and water. ----------------------
- How would the solution formed affect litmus paper? ---------------------
- The same gas is produced in the reactions involving potassium and sodium.
Write equations for the reactions between- Potassium and water ------------------------------------
- Sodium and water ------------------------------------------
- Calcium and water ------------------------------------
- Complete the following general equation for the reactions between metal and water.
- Arrange the three metals in the order of their reactivity with water, beginning with the most reactive.
Answers to Questions 5.2b
- Vigorous effervescence (production of colourless gas bubbles) and a colourless solution that turns phenolphthalein solution pink. The gas extinguishes a burning splint with a pop sound.
- Calcium hydroxide solution and hydrogen gas.
- The solution would turn red litmus blue.
- Potassium + Water ⟶ Potassium hydroxide + Hydrogen
Sodium + Water ⟶ Sodium hydroxide + Hydrogen
Calcium + Water ⟶ Calcium hydroxide + Hydrogen - Metal + Water ⟶ Metal hydroxide + Hydrogen
- Potassium, Sodium, Calcium