a) What is meant by an atomic symbol? Write the atomic symbol of iron and sodium.
b) Write two main characteristics of compounds.
c) Name two factors which decides if any substance will be solid, liquid or a gas.
d) Is burning of a candle a chemical change? Why?
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(a)The atomic symbol is used to identify the element to which an atom belongs and the number of electrons, protons and neutrons it contains. Iron(Fe) Sodium(Na)
(b)1)Components in a compound are present in a definite proportion.
2)It has a homogeneous composition
(c)The kinetic energies of the particles (atoms, molecules, or ions) that make up a substance. Kinetic energy tends to keep the particles moving apart.
The attractive intermolecular forces between particles that tend to draw the particles together.
(d)The process of burning (as opposed to evaporating) is a chemical reaction, a chemical change
Explanation:
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