Amino Acids – Proteins 1-Amino acids are organic compounds containing an amino group [NH2] and an acidic group [COOH] as substituents on the same carbon i.e., the a-carbon. Hence, they are called a-amino acids. 2-Amino acids contain amino (–NH2) and carboxyl (–COOH) functional groups. 3-Amino acids are classified as acidic, basic or … Read more
Chemistry Glossary 1- Acid – Compound that gives off H+ ions in solution. 2-Base – Substance which gives off hydroxide ions (OH-) in solution. 3-Catalyst – Substance that speeds up a chemical process without actually changing the products of reaction. 4-Density – Mass per unit volume of a substance. 5-Effusion – Movement of gas molecules … Read more
Chemistry Atomic Structure ; introduction to periodic table 1-Created by Dmitri Mendeleev (1834-1907), the periodic table orders all known elements in accordance to their similarities 2-The periodic table is a chart that categorizes elements by “groups” and “periods.” All elements are ordered by their atomic number. 3-The atomic number is the number of protons per … Read more
Conversion Factors Common Unit of MASS and WEIGHT 1 pound = 453.59 grams 1 pound = 453.59 grams = 0.45359 kilogram 1 kilogram = 1000 grams = 2.205 pounds 1 gram = 10 decigrams = 100 centigrams = 1000 milligrams 1 gram = 6.022 × 1023 atomic mass units or u … Read more
Chemistry 1-Electric bulbs are filled with Argon. 2-The purest form of iron is Wrought iron 3-The anode of a dry cell is made up of Zinc 4- Helium gas is filled in balloons because it is lighter than air 5-Non-Stick Kitchen wares are coated with Teflon 6-The isotopes used for the production of atomic energy … Read more
Chemistry -Important One Liners 1- The most important ore of aluminium is bauxite 2- An alloy used in making heating elements for electric heating devices is nichrome 3- German silver is an alloy of zinc, copper and nickel 4-Balloons are filled with helium 5- The most abundant metal in the earth’s crust is aluminium 6-The … Read more
Chemistry -Important Terms 1-Antacids -Used for the treatment of acidity – Examples are Eno, & Milk of magnesia [Mg(OH)2] 2-Analgesics – decreases the pain without causing unconsciousness. These are also known as ‘Pain Killers’ -Examples are Asprin, Analgin, seridon etc. 3-Antiseptics -They are applied on living tissues to kill or prevent the growth of micro-organisms … Read more
Chemistry -Important Basics A- Matter 1-Anything that exhibits inertia is called matter. 2- The quantity of matter is its mass. B- Mixture- 1-It is formed by physical combination of two or more pure substances in any ratio. 2-Homogeneous mixtures are those whose composition for each part remains constant. Examples are Aqueous and … Read more
Chemistry 1-The small molecular building units are called Monomers 2- Bases are chemical compounds that taste bitter, turn litmus blue and feel slippery 3-Liquified Petroleum Gas is a mixture of hydrocarbons containing three or four carbon atoms, such as propane, butane and pentane. 4-The substance, which produce heat and light on combustion are called fuels. … Read more
Chemistry 1-In Periodic table vertical columns are called Groups 2-Alkali metals are reactive metals 3-Unreactive non metals are called Noble gases 4-Protons and Electrons are electrically charged 5-The relative charge of Proton and Electron is +1, -1 6- What is atomic number of an atom ? Ans- Number of protons 7- What is the mass … Read more