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Pure Substances

Why is sodium...

Question

Why is sodium chloride and water called as pure substances even though they have more than one type of element ( pure substances consists of single type of particles)?

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Solution

They have fixed composition of elements. That is 23 parts of sodium and 35.5 parts of Chlorine.
Water has 2 parts of hydrogen and 8 parts of oxygen.

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STATEMENT 1: A pure substance consists of a single type of matter.

STATEMENT 2: A pure substance consists of more than one type of matter.

STATEMENT 3: Milk is a not a pure substance.

STATEMENT 4: Pure substance has same chemical nature.

Q. What are the two types of pure substances? Give one example of each type.

Q. Which of the following statements are true for pure substances?
(i) Pure substances contain only one kind of particle.
(ii) Pure substances may be compound or mixture.
(iii) Pure substances have the same composition throughout.
(iv) Pure substances can be exemplified by all elements other than nickel.

Q. Identify the pure substance containing only one type of element.

Q. A pure substance which contains only one type of atoms is called:

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