Describe each of the following as a physical or chemical property.

1. Chromium is a steel-gray solid.
2. Hydrogen reacts readily with oxygen.
3. Nitrogen freezes at -210 degrees Celsius.
4. Milk will sour when left in a warm room.

Physical Property
- Chromium is a steel-gray solid.
- Nitrogen freezes at -210 degrees Celsius.

Chemical Property
- Hydrogen reacts readily with oxygen.
- Milk will sour when left in a warm room.

The statements can be classified as physical or chemical properties. Chromium and nitrogen represent physical properties, while hydrogen and milk souring indicate chemical properties. Understanding these classifications allows us to better analyze substances and their behaviors.

Explanation:

Classification of Properties

In chemistry, properties of substances can be classified as either physical or chemical. Below are the classifications for the statements provided:

Chromium is a steel-gray solid. - This is a physical property as it describes a characteristic appearance of the element without changing its identity.
Hydrogen reacts readily with oxygen. - This is a chemical property because it describes the substance's ability to undergo a chemical change (combining with oxygen).
Nitrogen freezes at -210 degrees Celsius. - This is a physical property since it indicates a physical change of state from gas to liquid when temperature drops, but does not alter the substance itself.
Milk will sour when left in a warm room. - This is a chemical property because it involves a change in the composition of the milk, resulting in souring due to bacterial action.

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