Introduction to Chemical Properties of Oxygen – Oxygen is a very reactive non metal.– Many elements react with oxygen through burning to form a group of compounds called oxides.– Burning/combustion is the reaction of Oxygen with an element/substances.– Reaction in which a substance
The atmosphere is made up of air, a mixture of colourless, odorless gases which is felt as wind.There are various gases in the atmosphere a listed below with their percentage composition; There are different experiments that could be used to
An acid may be defined as a substance that turns litmus red.A base may be defined as a substance that turns litmus blue.An indicator is a substance that shows whether another substance is a base/alkaline,acid or neutral There are some common and naturally occurring acids as
(i) Solutions (solid-liquid dissolved mixture) When a solute dissolves in a solvent it forms a uniform mixture called solution. A substance/liquid in which another substance dissolves is called solvent. A substance /solid /gas which dissolves in a solvent is called
Chemistry is defined as the branch of science that deals with the structure composition, properties and behavior of matter. The Role of Chemistry in Society (i) Washing/cleaning with soap(ii) Understanding chemicals of life(iii) Baking(iv) Medicine(v) Fractional distillation of crude oil(vi)
A surd can be described as a root whose exact value cannot be found. It is an example of an irrational number; a number which cannot be expressed in the form: In getting the value of a surd, the decimal
Expansion of Algebraic Expressions Earlier, you read that: a(b + c) = ab + ac Example 1 Expand (2x – 3)(3x + 4) = 2x(3x + 4) – 3(3x + 4)= 6x2 + 8x – 9x -12= 6x2 – x – 12
A square is the result of multiplying a number by itself. Squares by Multiplication Find the Square of a) 3 , b) 14 , c) 245 a) 32 = 3 x 3 = 9b) 142 = 14 x 14 = 196c) 2452 = 245 x 245
A decimal is a fraction whose denominator is a power of 10. Express as decimal a) Express the following fraction as a decimal ⅜ Express decimals as fractions a) Express the following decimal as a fraction 0.355 b) Express the
Addition and Subtraction It should be noted that:a) + – = –b) – + = –c) – – = +d) + + = + As a student, please try: ( For this questions, please draw a number line as the one shown above from -14 to +14 )i) 4 + 8ii) -4 + 8iii)
