Common units of Concentration
Chemists use grams per cubic decimetre. Remember that 1000 cubic centimetres (cm3) equals 1 cubic decimetre (dm3) also equals 1 litre (L). We note that…
Chemistry
Define Solutions and Concentrations in terms of Chemistry
A Solution is a homogeneous mixture of two (or more) pure substances and typically consists of a solvent (the “dissolver”) which is generally present in…
Why is the Mole Useful?
In chemistry, the unit “mole” is used in many places, and is an important tool when working with quantities. If we express the R.A.M. of…
Introduce Mole
For practical purposes, a microscopic (i.e. how many atoms) view of substances is not useful. We need to deal in macroscopic (e.g. how many grams)…
What is Isotopes?
Many elements have more than one type of atom. These atoms have the same number of protons but different numbers of neutrons. Atoms having different…
Fundamental Subatomic Particles
Electrons are only found outside the nucleus. We can say that the electron has a negligible mass because it is —2000 times less heavy than…
What is Atomic Structure?
An atom was once thought to be the smallest part of something that could exist. In 1897, JJ Thompson discovered that by applying high voltage…
Balancing Chemical Equations
Write the correct formula for the reactants and products; reactants on left of arrow, products on right. Choose the most complicated compound that contains the…
Chemical Equation
A chemical equation is a shorthand description of the changes that occur in a chemical reaction such as Methane + Oxygen → Carbon Dioxide +…
What is electrovalent bond?
Electrovalent bond: The electrostatic force of attraction which holds the oppositely charged ions together is known as ionic bond or electrovalent bond. We can understand…
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