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Elements and Molecules: Unit 2 Overview

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Questions and Answers

What are some examples of elements?

Sodium, copper, silver, hydrogen, oxygen, etc.

How are atoms of different elements different in nature?

Atoms of different elements are different in nature.

What do some elements like sodium or copper contain as their constituent particles?

Atoms

How are molecules formed in elements like hydrogen, nitrogen, and oxygen?

Molecules are formed by two atoms combining. Signup and view all the answers

How are compounds formed?

Compounds are formed when two or more atoms of different elements combine in a definite ratio. Signup and view all the answers

Can the constituents of a compound be separated by physical methods?

No, they can only be separated by chemical methods. Signup and view all the answers

What are the two categories in which properties of matter can be classified?

Physical properties and chemical properties Signup and view all the answers

Give an example of a physical property.

Color Signup and view all the answers

What type of change is required to observe chemical properties?

Chemical change Signup and view all the answers

What are the constituent elements of a water molecule?

Hydrogen and oxygen Signup and view all the answers

What is the unique property of hydrogen, oxygen, and water?

Hydrogen burns with a pop sound, oxygen is a supporter of combustion, and water acts as a fire extinguisher. Signup and view all the answers

Why do atoms of different elements combine in a definite ratio to form compounds?

Atoms of different elements combine in a definite ratio to form compounds because this ratio is characteristic of a particular compound. Signup and view all the answers