Ch1: Atomic structure Discovering the electron - When electricity flows in an aqueous solution of ionic compounds‚ the metal ions appears at the negative electrode (cathode). - The metal exists in the solution as positively charged particles known as ions. - A 1+ ion plus one unit of electricity gives one metal atom. - Low pressures gases conduct electricity very well. - The glass of containing vessel opposite the cathode (negatives electrode) glowed when the applied potential difference
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NEBOSH PRACTICAL INSPECTION Observations Hazards / Good Practice Control measures Immediate‚ medium‚ long-term actions Timescale (Immediate‚ 1 week‚ etc) (1) Good practice: Adequate lighting‚ ventilation‚ and low background noise levels. Continue the good practice. Ongoing (2) Good practice: Operating manuals were available for some of the work equipments. Immediate: Continue to make the manuals accessible to the relevant employees. Medium: Arrange a suitable place to hold the manuals
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The element of Nickel is number 28 which means it has 28 electrons and 28 protons (this is the atomic number). The atomic mass of Nickel is 58.71 g.mol^-1 which means that there are 30.69334 neutrons since you subtract the number of protons from the atomic mass to get the number of neutrons. The electronegativity of Nickel is 1.8 on the Pauling scale; this is the tendency of Nickel to attract a bonding pair of electrons. The density of Nickel is 8.9 g.com^-3 at 20°C and the melting point is 1454
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Maria Reyes iLab‚ Week #3 ATOMIC WEIGHT OF MAGNESIUM LAB Introduction The purpose of this lab was to determine the atomic weight of magnesium by measuring the amount of hydrogen gas evolved when hydrochloric acid reacted with magnesium. In order to measure the atomic weight I needed to measure the amount of the hydrogen gas that was evolved in reaction to the acid of the magnesium. The reaction used was: Mg + 2HCl --> H2 + Mg2+ (aq) + 2Cl- (aq). The major findings of this experiment were that
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5.1 Homework PG178 Questions: 2‚ 3‚ 5‚ 8‚ 9 2. Classify each of the following observations as an example of either a chemical or physical property a. Liquid nitrogen boils at -198˚C This is a physical property because it is a matter of changing state. b. Propane leaking from a damaged tank‚ ignites easily This is a chemical property because it is flammable. c. Silver jewelry tarnishes (darkens) in air This is a chemical property because the silver becomes dark because of oxygen d. Spilled
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Chemistry has been called the science of what things are. Its intent is the exploration of the nature of the materials that fabricate our physical environment‚ why they hold the different properties that depict them‚ how their atomic structure may be fathomed‚ and how they may be manipulated and changed. Although organic reactions have been conducted by man since the discovery of fire‚ the science of Organic chemistry did not develop until the turn of the eighteenth century‚ mainly in France at
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Running head: Organic Chemistry Tamanna Ashraf Palm Beach State College Principle of Chemistry Ceravolo‚ Joseph MW 11:00am-12:15pm February 6th‚ 2011 We all are living in a science world. Everything has some kind of reaction going on in our living area. It is just we do not get to see or realize that where n how we having our life much easier than it used to be. In these writing assignments‚ the topic is about the organic chemistry. In organic chemistry‚ we all have different kinds of compounds
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What sort of thing form in chemical reactions? Products are the finished product of a chemical equation‚ and reactants are what make up the products. ( atoms‚ matter‚ molecules‚ energy‚ rate‚ temperature) Name some compounds: H2O (Hydrogen and Oxygen elements - Water) CH4 (Carbon and Hydrogen elements - Methane) NaCl (Sodium Chloride- salt) Different types of compounds: Metal + Metal = Metallic Compound Metal + Non-Metal = Ionic compound Non-Metal + Non-Metal = Covalent compound Different types
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Safety measures in the chemistry laboratory The mentors are responsible for instructing the competitors as to the risks to which they are subjected when working in a chemistry laboratory‚ as well as to the basic safety measures‚ and first aid. Specific behavioral and safety measures must be obeyed to prevent accidents. Rules in the lab: * Use protective clothing all the time (e.g. lab coat and safety glasses) * Use a hair band to keep your hair away from your face. *
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Materials: • Graduated cylinder • 2 marbles • Liquids to test such as water‚ corn syrup‚ canola oil‚ motor oil • Masking tape • 1 cm ruler • Stopwatch that is accurate to 0.1 or 0.01 seconds SAFETY NOTE: See Texas Science Safety Manual for lab and investigation guidelines: http://www.tenet.edu/teks/science/safety/safety_manual.html Engagement: Place a wooden ramp on a stack of books. Challenge students to predict which of three liquids (syrup‚ water‚ and motor oil) will reach the bottom
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