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

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

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

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

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