Rated 4.8/5 by parents & students
Concept Of Culturing Culturing simply involves the techniques of growing micro-organisms in special media in the laboratory. It involves the making of sterile medium, inoculating, incubating and examining micro-organisms. By this means, micro-organism characteristics such as colour, pattern of growth and appearance can be seen. Culture of micro-organisms can be grown from water, air, […]
SS1 Biology Second Term: Concept Of Culturing Read More »
What is Reproduction? Reproduction is defined as the ability of living organisms to give rise to new individuals of the same species. The purpose of reproduction is to ensure the continuity of life. Sexual Reproduction Sexual reproduction involving the fusion of female gamete (ovum) and male gamete (spermatozoon), which forms a zygote that potentially develops
SS1 Biology Second Term: Reproduction Read More »
When Joseph was sold by his brothers into slavery, he ended in the house an Egyptian official called Portipher. Portipher immediately knew that the Lord was with Joseph. This made him put the lad in charge of all things in the house. And with Joseph in charge of everything happening within the household of Portipher,
SS1 C.R.S Third Term: Joseph Overcame the Temptation of Portipher’s Wife Read More »
What is Mixture? A mixture consists of more than one element or compound. The components of a mixture can be separated by physical methods. A mixture is a material system made up of two or more different substances which are mixed but are not combined chemically. A mixture refers to the physical combination of two or more
SS1 Chemistry First Term: Mixture Read More »
Introduction Matter is defined as anything that occupies space and has mass. The particles of matter could be atoms, molecules or ions. It is important to note that the particles that make up all matter vary in their subatomic composition. The number and arrangement of an atom’s particles (neutrons, protons, and electrons) determines the properties of
SS1 Chemistry First Term: Particulate Nature of Matter Read More »
Alkalinity and Acidity Alkalinity and Acidity are measured using a scale of numbers from 0 to 10 called the pH scale. A solution with pH value of 7 is neutral. A solution with a pH value less than 7 is acidic while a solution with pH value greater than 7 is alkaline. Acidity increases with decreasing
SS1 Chemistry Third Term: Acidity and Alkalinity Read More »
Introduction Acids have long been associated with sour taste of some fruits such as lime and lemon. Their ability to change litmus solution from blue to red is well known. There are two classes of acids – organic and inorganic acids. The former occurs as a natural product in plants and animal while the latter
SS1 Chemistry Third Term: Acids (Organic and Inorganic) Read More »
Introduction Carbon forms the largest number of compounds, next only to hydrogen. It ranks seventeenth in the order of abundance in the earth’s crust. Carbon occurs in the free native state as well as in the combined state. Carbon and its compounds are widely distributed in nature. In its elemental form, carbon occurs in nature
SS1 Chemistry Third Term: Carbon Read More »
Introduction Carbon forms two important oxides, namely carbon (iv) oxide and carbon (ii) oxide. The atmosphere contains about 0.03% by volume of carbon(iv) oxide. A small percentage of carbon (iv) oxide is found in the dissolved form of water. In the combined form, it is found mainly as metallic trioxocarbonates(iv) and hydrogen trioxocarbonates (iv) in
SS1 Chemistry Third Term: Oxides of Carbon Read More »
Introduction A salt is an ionic compound formed when the hydrogen of an acid is partly or completely replaced by a metal ion or ammonium ion. All salts are chemically and electrically neutral. Example: Diagram above shows that when the hydrogen ion in nitric acid is replaced by Na+, Ca2+, NH4+ or Al3+ ions, salts
SS1 Chemistry Third Term: Salts Read More »
