Write the word equations for the reactions between oxygen and each of the following: i) Zinc metal ii) Calcium iii) Magnesium iv) Potassium v) Sodium. 29. i) Give the name of the apparatus shown below

Here are the answers to your questions:

28. Write the word equations for the reactions between oxygen and each of the following:

• i) Zinc metal: $$\text{Zinc} + \text{Oxygen} \to \text{Zinc oxide}$$
• ii) Calcium: $$\text{Calcium} + \text{Oxygen} \to \text{Calcium oxide}$$
• iii) Magnesium: $$\text{Magnesium} + \text{Oxygen} \to \text{Magnesium oxide}$$
• iv) Potassium: $$\text{Potassium} + \text{Oxygen} \to \text{Potassium oxide}$$
• v) Sodium: $$\text{Sodium} + \text{Oxygen} \to \text{Sodium oxide}$$

29. The apparatus below is commonly used in a chemistry laboratory to measure volumes.

• i) Give its name: Answer: Pipette (or Volumetric pipette)

• ii) Name any other three apparatus which can be used to measure volumes of liquids: a) Measuring cylinder b) Burette c) Volumetric flask