away/donate/release its (outermost) electron more | | | | | |easily/readily. | |1 | | | |or‚ Rb can form ion/cation/positive ion more easily/readily. | |(1) | | | |or‚ The strength of metallic bond between Rb atoms is weaker than that between K atoms/Rb can atomize more | | | |
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Student Number Mark / 39 Chemistry Preliminary Course Final Examination • 2006 General Instructions • • • • • • • Reading time – 5 minutes Working time – 45 minutes Write using black or blue pen Draw diagrams using pencil Board-approved calculators may be used A Data Sheet and a Periodic Table are provided Write your Student Number at the top of this page Total Marks – 39 Part A – 10 marks • Attempt Questions 1 – 10 • Allow about 10 minutes for this part Part B – 29 marks • Attempt
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Chapter 1 Chemical Reactions and Equations Q.1. Why should magnesium ribbon be cleaned before burning in air ? Ans: Magnesium ribbon is a very reactive metal. When stored it reacts with oxygen to form a layer of magnesium oxide on its surface. This layer of magnesium oxide being a stable compound prevents further reaction of magnesium with oxygen. The magnesium is cleaned before burning in air to remove this layer so that the metal can be exposed to air properly. Q.2. Write the balanced
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happens because as the metal gets warmer‚ the metal ions in the wire gain kinetic energy and start to vibrate. As their motion becomes more erratic they are more likely to get in the way and disrupt the flow of the electrons and therefore increase the resistance. Length of the wire This is easier to explain using the "hallway" analogy. Imagine in a corridor‚ there are some people (electrons) trying to move‚ and there are some people (ions) staying still. If the corridor was very short‚ there
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Analysis of Alcohols‚ Aldehydes and Ketones Karl Wayne Mancao‚ Raphaell Mordeno‚ Andres Pastrana III*‚ and Shannen Peñaverde Department of Biology‚ University of Santo Tomas‚ Manila‚ Philippines Abstract The proponents have done several tests for identifying alcohols‚ aldehydes and ketones. These tests are Dichromate test‚ Tollens test‚ Lucas test‚ DNPH test and Iodoform test. Three samples got positive result in dichromate test and one in Tollens test. Lucas test got one sample that has
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1 : 2 C. 2 : 1 D. 1 : 3 E. 3 : 1 24. A solution contains the ions Ag+‚ Pb2+‚ and Ni2+. Dilute solutions of NaCl‚ Na2SO4‚ and Na2S are available to separate the positive ions from each other. In order to effect separation‚ the solutions should be added in which order? A. Na2SO4‚ NaCl‚ Na2S B. Na2SO4‚ Na2S‚ NaCl C. Na2S‚ NaCl‚ Na2SO4
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The plasma and Bose-Einstein Condensate states of matter‚ while having some similarities‚ are two completely different forms of matter and connect with the Kinetic Molecular Theory in differing ways. Plasma is the fourth state of matter. It’s a fluid‚ gas-like substance that consists of a mixture of free electrons‚ neutral atoms‚ and charged ions. It is made up of both positively and negatively charged particles‚ which contributes to plasma’s ability to react to and create electromagnetic forces.
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Title of Experiment: An Activity Series Lab MSDS: Copper‚ Cu(s) Stability- Stable. Incompatible with strong acids‚ active halogen compounds‚ chlorine‚ fluorine‚ iodine‚ bromine‚ ammonia. May react explosively with strong oxidizing agents. Toxicology-Dust may cause respiratory irritation. Personal Protection- Suitable ventilation if handling powder. Zinc‚ Zn(s) Stability-Stable. Incompatible with amines‚ cadmium‚ sulfur‚ chlorinated solvents‚ strong acids‚ strong bases. Air and moisture
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consider first the thermodynamic definition of chemical stability. We then consider chemical kinetics (Section 3.2) and how it can provide information about reactivity. We also explore how structure influences stability and reactivity. We want to learn how to make predictions about reactivity based on the structure of the reactants and intermediates. We begin by reviewing the principles of thermodynamics and kinetics‚ which provide the basis for understanding the relationship of structure to stability and
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White dropping ray - tripod stand and mesh -stopwatch - Biuret͛s solution - Sodium Hydroxide solution (NaOH) (or Potassium Hydroxide solution) - Hydrochloric Acid (HCl) - Sodium Hydrogencarbonate (NaHCO3) - Iodine Solution(I2) (or Potassium Iodide solution) - Ethanol (C2H5OH) - distilled water (H2O) Test Method Reducing Sugars 2cm3 of solutions A-G were placed into separate‚ labelled test tubes using separate measuring syringes. An equal volume (2cm3) of Benedict͛s solution was
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