Metals are not available naturally in the form that we use. They are extracted from their ores. Metals and their ores are shown in the table below: S.No Metal Ores 1 Sodium(Na) Chile saltpetreTronaBoraxCommon salt 2 Aluminium(Al) BauxiteCorundumFeldsparCryoliteAluniteKaolin 3 Potassium(K) Nitrate(saltpetre)Carnalite 4 Magnesium(Mg) MagnesiteDolomiteEpsom saltKieseriteCarnalite 5 Calcium(Ca) DolomiteCalciteGypsumFluorsparAsbestos 6 Strontium(Sr) StrontianiteSilestone 7 Copper(Cu) CupriteCopper glanceCopper …
1. Calcium Carbonate Formula: CaCO3 Uses: Non-prescription drug for relief from acid indigestion and heartburn. It is also considered as a calcium supplement. 2. Sodium Chloride Formula: NaCl Uses: Used to season food (during food preparation and at the table), also used in the past as a method of food preservation. 3. Methane Formula: CH4 Uses: natural gas, fuel (also called …
Which of the following is an element? (A) Diamond (B) Emerald (C) Sapphire (D) Ruby Answer: A (Graphite and Diamond are allotropes of Carbon) The catalyst used in the production of ammonia by the Haber’s process is (A) Platinum (B) Molybdenum (C) Iron (D) Nickel Answer: B Which of the following is to be found …
Terms: Ampere – The ampere is the standard unit of measure of electric current. It is sometimes written as amp. Alternating current (AC) – An electric current that reverses direction on a periodic basis. It is widely used to transport power on power lines. Direct current (DC) – A type of current that only flows …
1. Name a food that contains an acid.2. Describe the taste of lemons and limes.3. What does ‘corrosive’ mean?4. What should you do if you spill acid?5. How does an indicator show the difference between an acid and an alkali?6. What colour does red cabbage juice go when it is added to lemon juice?7. What …
States of matter Atoms, elements and compounds Stoichiometry Electrochemistry Chemical energetics Chemical reactions Acids, bases and salts The Periodic Table Metals Chemistry of the environment Organic chemistry Experimental techniques and chemical analysis
Physical chemistry Atomic structure Atoms, molecules and stoichiometry Chemical bonding States of matter Chemical energetics Electrochemistry Equilibria Reaction kinetics Inorganic chemistry 9. The Periodic Table: chemical periodicity 10. Group 2 11. Group 17 12. Nitrogen and sulfur Organic chemistry 13. An introduction to AS Level organic chemistry 14. Hydrocarbons 15. Halogen compounds 16. Hydroxy compounds …
•When substances change their properties such as change of state, solubility, shape, or form, these changes are called physical changes. •When a new substance is formed with different compounds and properties, this change is called a chemical change. •And, the reaction that makes this change is called a chemical reaction. Physical changes Chemical changes No …
Hydrocarbons• Carbon atoms bond to each other by single, double, and triple bonds. • Saturated hydrocarbons contain only single bonds. • Unsaturated hydrocarbons contain at least one double or triple bond. Refining Hydrocarbons• Fractional distillation involves boiling petroleum and collecting each group of components as they condense at different temperatures. • Fractional distillation towers do …
Atoms consist of three basic particles: protons, electrons, and neutrons. The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain electrons (negatively charged). mass number: The sum of the number of protons and the number of neutrons in …