Answer:
The physical properties are a and c.
The chemical properties are b and d.
Explanation:
A physical property is a property in which a chemical change is not necessary to know. A and C are therefore physical properties because no chemical change was necessary to know them.
A chemical property is a property in which a chemical change is necessary to know. B and D are therefore chemical properties because a chemical change was necessary to know them.
Some of the characteristics of a physical change include:
• A physical change is regarded as a temporary change as it can be reversed.
• The physical properties are affected such as the size, shape etc.
• Some examples of physical change are melting of wax, freezing of water, boiling of water, etc.
Some of the characteristics of a chemical change will be:
• A chemical change is regarded as a permanent change as a new substance will be formed as it's reversible.
• Some examples of chemical change include burning of coal, food digestion, rusting, etc.
Based on the description above, the answer is given below:
(a) Zinc melts at 420 ∘C.
This is a physical change.
(b) When zinc granules are added to dilute sulfuric acid, hydrogen is given off and the metal dissolves.
This is a chemical change.
(c) Zinc has a hardness on the Mohs scale of 2.5 and a density of 7.13 g/cm3 at 25 ∘C.
This is a physical change
(d) It reacts slowly with oxygen gas at elevated temperatures to form zinc oxide, ZnO.
This is a chemical change.
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