CSEC CHEMISTRY NOTES ON PERIODIC TRENDS From Chemistry for CSEC by Tania Chung-Harris and Mike Taylor Chemistry for CAPE by Susan Maraj and Arnold Samai Periodic Trends in Group II Elements in Group II The elements in Group II are called alkaline earth metals. Be‚ Mg‚ Ca‚ Sr‚ Ba‚ Ra Beryllium‚ Magnesium‚ Calcium‚ Strontium‚ Barium‚ Radium These elements bond by metallic bonds (intramolecular forces) to form giant metallic structures. The size of the
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to accept and unshared pair of electrons from a base. An alkaline is a chemical compound that neutralizes or effervesces with acids and turns litmus blue; it’s a corrosive substance. Two similarities between acid and alkaline is that they are sour and they each changes litmus paper into another color than it was originally was. The differences between an acid and an alkaline are that acids have a Ph scale of any numbers below 7 and alkaline is from any numbers that is 7 or greater. I have searched
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HOW THE PERIODIC TABLE OF ELEMENTS HAS CHANGED OVER TIME? The periodic table has changed a lot since the first one was created‚ it has also expanded and has more elements it has also changed the weight of other elements.‚ it was first created in rows and columns and all different confusing symbols and equations‚ the periodic table today is a lot more structure and easier to understand. The periodic table has is always being changed s new discoveries are being made and new theories are being developed
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a 44 year old French geologist‚ he created a list of the elements arranged by increasing atomic weight. The list was wrapped around a cylinder so that several sets of similar elements lined up‚ creating the first geometric representation of the periodic law. oIn 1862 was the first person to make use of atomic weights to reveal periodicity (i.e. when the elements were arranged according to their atomic weights‚ similar elements seemed to occur at regular intervals.) He drew the elements as a continuous
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Elements Atomic No At. Mass Valency Elements At.No. At.Mass Valency Hydrogen(H) 1 1 (+1) Silicon(Si) 14 28 (+4) Lithium(Li) 3 7 (+1) Germanium(Ge) 32 73 (+4) Sodim(Na) 11 23 (+1) Tin(Sn) 50 119 (+4‚+2) Potassium(K) 19 39 (+1) Lead(Pb) 82 207 (+4‚+2) Rubidium(Rb) 37 85 (+1) Nitrogen(N) 7 14 (-3‚+5) Cesium(Cs) 55 133 (+1) Phosphorus(P) 15 31 (+3‚+5) Francium(Fr) 87 223 (+1) Arsenic(Ar) 33 75 (+3) Beryllium(Be) 4 9 (+2) Antimony(Sb)
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reaction of Alkali metals and Alkaline Earth meatals are compared in this lab. The pH of each of the resulting metal solutions are tested and the products of the reaction between calcium and water is discovered. The tested elements are sodium‚ lithium‚ potassium and calcium and each of them were placed in a beaker filled with water. The resulting solutions pH levels were tested with litmus paper. There were more steps for caclium because it is the only Alkaline Earth metal. For calcium‚ the gas produced
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Two- Way Table is a set of data in which the observations are written yij i= 1‚2 ‚…‚I j= 1‚2‚…‚J and displayed in a rectangular array as shown below TABLE1. Format and notation for a Two-Way Table i J 1 … J 1 . . . I y11 . . . y1J . . . . . . . . . yI1 . . . yIJ This
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Periodic Table Trends When you think of a periodic table‚ you think of elements like oxygen‚ neon‚ lead‚ and iron. You may even think of numbers‚ rows‚ and columns. You may not think about trends that are happening throughout a periodic table. There are many different trends that go on in a periodic table. The trends that I am going to be describing throughout this paper are atomic mass‚ atomic radius‚ first ionization energy‚ and electronegativity. When you study a normal/ordinary periodic
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Expt. BL 304 Kinetics of Alkaline Phosphatase Objective To study the kinetics of alkaline phosphatase. Procedure 1. Sodium carbonate - sodium bicarbonate buffer: Dissolve 20 ml of 0.2 M solution of sodium carbonate (2.12 gm in 100 ml distilled water) and 230 ml of 0.2 M sodium bicarbonate (4.12 gm in 250 ml distilled water) to make up the volume 250 ml with pH 9 -9.2 2. 5 N sodium hydroxide solution (10 gm in 50 ml distilled water) 3. Substrate stock solution: Dissolve 0.1 gm of p-nitrophynyl
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Best Alkaline Water Filter Method There exist numerous ways to keep a healthy life. One of such ways which has constantly evaded the knowledge of most people is the necessity of drinking alkaline water. It has been neglected over time due to the stereotype that it takes very difficult methods to make. That is not the case as there has evolved simple and home based ways to go about this very important aspect of human healthy living. However‚ I will be giving brief but cogent importance of drinking
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