Question

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Answer 1

1. Atoms are defined as “the basic building blocks of matter”. It is the smallest constituent unit of matter that posses the properties of the chemical element.

A molecule is the smallest particle of a substance which has the properties of that substance and can exist in the free state. (It is a combination of atoms).

2. 3 states of matter are:

• Gas
• Liquid
• Solid

Pure substances are substances that are made up of only one kind of particles and has a fixed or constant structure.

Pure substances are classified as elements and compounds.

3.  An element is the basic form of matter that cannot be broken down into simpler substances by chemical reactions. Example: Oxygen, Hydrogen, etc.

Atom is the smallest part of an element.

Pure substance

Impure substance (Mixture)

4.    A pure substance is a homogeneous material with a definite, invariable

      chemical composition.

•  Impure substances are mixtures of two or more elements or compounds or both.

• A pure substance has definite invariable physical and chemical properties.
•  A mixture has no definite set of properties. They have properties in their different parts.

• Components of a pure substance cannot be separated by physical methods of separations such as - magnetic separation, evaporation, etc.

• Components of a impure substance can be separated by physical methods of separations such as - magnetic separation, evaporation, etc.

• Examples of pure substances: water, Iron, oxygen , gold etc.
•  Examples of mixture: sugar solution, mixture of sand and iron nails etc.

5. A compound is a pure substance formed by the chemical combination of two or more elements in a fixed ratio by mass. Example: Water, Acid, etc.

Molecule is the smallest part of an compound.

6. Carbon dioxide, is another example of an inorganic compound because it does not contain both carbon and hydrogen. One molecule of carbon dioxide contains one atom of carbon and two atoms of oxygen.

7. Water is a pure substance because it only contains one type of molecule.

8. A chemical symbol is a representation of chemical elements using one or two letters.

10. Chemical formula tells us the number of atoms of each element in a compound. It contains the symbols of the atoms of the elements present in the compound as well as how many there are for each element in the form of subscripts.