Question

Classify the following as physical or chemical properties: 2m(a) The composition of a sample of steel is 98% iron, 1.5% carbon and 0.5% other elements.(b) Zinc dissolves in hydrochloric acid with the evolution of hydrogen gas.(c) Metallic sodium is soft enough to be cut with a knife.(d) Most metal oxides form alkalis on interacting with water.
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Answer 1

Answer:

a. it is a physical property as no new compound is formed because steel is an alloy and alloy is a homogeneous mixture of two or more metals or of metallic elements with non - metallic elements.

b. it is a chemical property because chemical reaction takes place between zinc and hydrochloric acid with the evolution of hydrogen gas and a compound zinc chloride is formed.

c. It is a physical property because cutting with knife does not form a new substance.

d. It is a chemical property as new compound is being formed by the reaction of metal oxide and water.

Explanation:

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