Problem: Read the following descriptions of the element zinc and indicate which are physical properties and which are chemical properties.Zinc melts at 420 °C. When zinc granules are added to dilute sulfuric acid, hydrogen is given off and the metal dissolves.Zinc has a hardness on the Mohs scale of 2.5 and a density of 7.13 g/cm3 at 25 °C. It reacts slowly with oxygen gas at elevated temperatures to form zinc oxide, ZnO.

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Recall:

Physical properties refer to properties that can be measured without changing the identity and composition of the substance.

Meanwhile, chemical properties refer to properties that describe the way a substance may change or react, to form other substances.

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Problem Details

Read the following descriptions of the element zinc and indicate which are physical properties and which are chemical properties.

Zinc melts at 420 °C. 

When zinc granules are added to dilute sulfuric acid, hydrogen is given off and the metal dissolves.

Zinc has a hardness on the Mohs scale of 2.5 and a density of 7.13 g/cm3 at 25 °C. 

It reacts slowly with oxygen gas at elevated temperatures to form zinc oxide, ZnO.

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