Grade 9 Chemistry
1. Define Atom. - Answer: An atom is the fundamental and smallest unit of a chemical element, composed of three
subatomic particles: protons, neutrons, and electrons.
2. Explain Atomic Radius. - Answer: Atomic radius refers to the average distance from the center of an atom...
- Answer: An atom is the fundamental and smallest unit of a chemical element, composed of three
subatomic particles: protons, neutrons, and electrons.
2. Explain Atomic Radius.
- Answer: Atomic radius refers to the average distance from the center of an atom's nucleus to its
electrons in the outermost orbital.
3. What is Boiling Point?
- Answer: Boiling point is the temperature at which a liquid changes to vapor, such as water boiling at
100°C under standard conditions.
4. Describe Binary Compound.
- Answer: A binary compound consists of two different chemical elements, often forming ionic bonds.
, 5. Define Chemical Change.
- Answer: Chemical change involves the irreversible rearrangement of atoms in one or more
substances, resulting in the formation of new substances with altered chemical properties. For example,
the rusting of iron is a chemical change.
6. Explain Chemical Property.
- Answer: A chemical property is a characteristic of a substance that becomes evident during chemical
reactions, involving changes in composition or identity. For instance, combustibility, which determines if
a material can catch fire and burn, is a critical chemical property.
7. What does Combustibility refer to?
- Answer: Combustibility describes the ability of a substance to ignite and burn, such as the highly
flammable nature of gasoline vapor.
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