Chemical Bonds – Definition

Terms and Definition Ionic Bond Ionic bond is the chemical formed when positive ion and negative ion is attracted by strong electrostatic forces. Ionic Compound Ionic compound consist of positive ions and negative ions which are held by strong electrostatic forces of attraction. Covalent bond Covalent bond formed when two or more non-metal atoms share valence … Read more

Chemical Equation

Writing Chemical Equations A Balance Equation According to the Law of Conservation of Mass, atoms cannot be created or eliminated in the process of chemistry reaction. Therefore, the amount of atom of each element before reaction must be equal after reaction. Example:Balance the following chemical equations: Mg + O2 → MgO CuO + H2 → … Read more

Mass of Substance and Number of Particles

Sometime, you may be given the mass of a substance, and asked to find the number of particles (or vice versa). To solve the problem, we must find the number of mole of the substance then only we can find the number of particles (or mass of the substance). Example: How many molecules are there … Read more

Number of Mole and Number of Particles

Number of Mole and Number of Particles We have just learn that, mole is a quantity, and it is equal to 6.02 x 1023. The number 6.02 x 1023 is called the Avogadro constant. Therefore, if we are given the number of mole of substance, and asked to find the number of particles (atoms, molecules or ions) in … Read more

Concept of Mole

A mole is defined as the amount of substance which contains the Avogadro Number of particles. The Avogadro Number (or Avogadro Constant) is defined as the number of atoms in 12 g of the carbon-12 isotope, which is equal to 6.02 x 1023. 1 mole = 6.02 x 1023 Example:1 mol of atoms = 6.02 x … Read more

Chemical Formula of Ionic Compounds

Formula of Ions Ionic compounds made up of positive ions and negative ions. To write the formula of an ionic compound, we need to know the symbol and charge of the ions in the compound. Positive ions that you need to know in SPM form 4 chemistry: Ion Symbol Ion Symbol Potassium K+ Calcium Ca2+ … Read more

Chemical Formulae

Each element is represented by its own chemical symbol. In an element, the chemical formula represents the atoms in the molecule. The chemical formula tells us: the types of atoms or ions in the compound, the number of atoms or ions in the compound, For example, the chemical formula for ethene is C2H4. This shows … Read more

Number of Mole and Volume of Gas

Molar Volume of Gas Equal amount of gas occupies same volume of space. Molar volume of a gas is defined as the volume occupied by one mol the gas at certain condition At room temperature(25ºC) and pressure (1 atm), one mole of any gas occupies a volume of 24 dm³ (24 000 cm³ ) At … Read more