Question

Observe the reaction between zinc and dilute hydrochloric acid and answer the following.

i. Predict the products for this reaction.
ii. Write the characteristic evidence for the above reaction.
iii. List any other two characteristics of a chemical reaction.
iv. Write the word and balanced chemical equation for the above reaction.
v. Which gas is evolved here? Explain the purpose of bringing burning candle here

Answer 1

Answer

Zinc reacts with dilute sulphuric acid to produce hydrogen gas (H2) and zinc sulphate. This is an example of displacement reaction of a non-metal by a metal. 2. Zinc is more reactive than hydrogen

Answer 2

Answer:

i) zinc sulphate and hydrogen gas is evolved

ii) The characteristic evidence is that hydrogen gas is evolved.

iii) a) exothermic reaction

b) evolution of hydrogen gas

iv) 2Zn + 2HCl ---> 2ZnCl + H2

v) Hydrogen gas is evolved. The purpose of bringing burning candle is that if the evolved gas is hydrogen it will produce a popping sound when brought close to it.

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