Question

Q1 When magnesium is placed in air, no new substances are formed but when magnesium is burnt in air, a white solid, magnesium oxide, is formed.

a: What can you infer about the formation of a compound from the observation above?

write a word equation for the above chemical reaction.



Q2 Copper (II) oxide is a black solid formed from the elements Copper and oxygen. Copper is a reddish brown metallic solid and oxygen is a colourless gas at room temperature.

a: What can you infer about the properties of a compound and its constitute elements from the example of Copper (II) oxide?

b: When Copper (II) oxide combines chemically with hydrogen, copper and water are produced.

(i) write a word equation for this chemical reaction.

(ii) Are the products formed elements or compounds?​

Answer 1

Answer:

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