Part a read the following description of the element zinc and indicate which are physical properties and which are chemical properties. (a) zinc melts at 420 ∘c. (b) when zinc granules are added to dilute sulfuric acid, hydrogen is given off and the metal dissolves. (c) zinc has a hardness on the mohs scale of 2.5 and a density of 7.13 g/cm3 at 25 ∘c. (d) it reacts slowly with oxygen gas at elevated temperatures to form zinc oxide, zno. drag the items into the appropriate bins.

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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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.

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