Metal reactivity and displacementIB MYP Chemistry: Mind map

Exam questions on Metal reactivity and displacement

1. A teacher in Doha demonstrates the reactions of metals with cold water. She adds small pieces of potassium, calcium and copper to separate troughs of water. The potassium moves across the surface and burns with a lilac flame, the calcium fizzes steadily and the copper does not react.
   Write the word equation for the reaction of calcium with water and state the test for the gas produced.2 marks
2. A student in Dublin adds equal-sized pieces of magnesium, zinc, iron and copper to separate test tubes of dilute hydrochloric acid. Bubbles form rapidly with magnesium, steadily with zinc and slowly with iron, and there are no bubbles with copper.
   Write a balanced symbol equation for the reaction of magnesium with dilute hydrochloric acid.2 marks
3. Students at a school in Seoul investigate displacement reactions. They add 1.0 g of magnesium powder, zinc powder or iron powder to 25 cm³ of copper(II) sulfate solution in a polystyrene cup with a lid, stir, and record the highest temperature reached. A pink-brown solid forms in each cup.
   State a hypothesis for the investigation, including a prediction of the order of the temperature rises, and give a scientific reason.3 marks