مدرستنا الثانوية اإلنجليزية‚الشارقة OUR OWN ENGLISH HIGH SCHOOL‚ SHARJAH A GEMS SCHOOL CHEMISTRY WORKSHEET TOPIC: METALS AND NON-METALS GRADE:8 Note: Revise the symbols and valency of metals and non-metals. Q1.What would you observe when you put a) Some zinc pieces into blue copper sulphate solution? b) Some copper pieces into green ferrous sulphate solution? c) An iron nail into blue copper sulphate solution? Q2.Complete and balance the following equations: a) Zn + O2 b) Pb + O2 c) Cu
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Introduction An atom is the smallest part of an element that can take part in a chemical change. The word “atom” comes from the Greek “atomos”‚ which means “unable to be cut”. Atomism is the philosophy of the existence of atoms. The first theories of atoms come from India. There was a Hindu sage named Kanad that hypothesized that all mater was composed of earth‚ water‚ light‚ wind‚ ether‚ time‚ space‚ mind and soul. Then another philosopher named Pakuda Katyayana suggested that everything can be
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An example of potential energy is A) a coiled spring. B) running water. C) tree branches blowing in the breeze. D) a moving elevator. E) electrical energy. Points Earned: 1.0/1.0 The correct answer is A. The definition of potential energy is an inactive type of energy that is stored for future use. All of these answers describe active energy‚ for example‚ running water is very active but can generate other types of energy. Which one of the following substances will float in gasoline
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ChemActivity 10: Exercises 1. Draw a complete mechanism including the intermediate and most likely product for the reaction of each alkene below with H-X. H + H Cl + Cl Cl + + Br H Br H I Br + H I H + I H 2. Draw a complete mechanism of each pair of reactant including any favorable rearrangements and all important resonance structures of all intermediates. Reactant Pair 1 Cl H Br 1 + Cl No shift stable benzylic carbocation H: shift H H Br
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Christina Hang Vanessa Hang Seng Xiong Period 5 December 14‚ 2012 Molecular Mass by Freezing Point Depression Objective: Determine the molecular mass of an unknown substance by finding the change in freezing point of a solvent when the unknown substance is dissolved in it. Qualitative Data: Trials BHT (g) Cetyl –Alcohol (g) Unknown substance (g) Melting Temperature 1 0.48 g 0 0 69.3 2 0.46 g 0.09 g 0 66.9 3 0.49 g 0 0.11 g 53.7 Analysis: 1.) Determine ___ for the solution of cetyl
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Marybeth Brooks Physics Lab III Specific Heat Capacity Lab May 25‚ 2011 Abstract The specific heat capacity of various metals can be calculated and compared to accepted literature values. Dropping heated metal samples into a calorimeter filled with water and then measuring the change in the temperature of the system accomplished this. The metal samples were heated in a boiling water bath and were assumed to be at 100 C when they were removed. It was added to a calorimeter and stirrer
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Heat and Energy Transfer Lab Materials needed: Part 1: bowls (not included in the lab kit; use cooking pots or plastic containers- something large enough to fit your hand) ice (not included in the lab kit) thermometers Part 2 test tubes – use three similar glasses or cups water various household materials for insulation stove or microwave to heat up water Part 1: Heat transfer and human sensation 1. Pour warm water in the bowl on the left‚ cold water in the bowl on the right‚
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Hoang Ngo Lab 6 report Anita Dey Thursday 8am Abstract: We recently performed a liquid nitrogen experiment in finding the Latent heat of the substance. We isolated two parts of the experiment in order to find out how much evaporation of the liquid nitrogen was from the surroundings B and how much evaporation from the electricity G. 1. When a substance is undergoing a phase transition‚ more heat (energy) is being added to the Substance but its temperature (a way of measuring its energy) is not
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radiation is one of the three ways in which heat is transferred. In convection‚ heat can be exchanged from one fluid to another. In this experiment‚ a heated plate is in contact with air inside a rectangular cross section duct. The air is heated by conduction from the heated plate. The density of the air decreases as it is heated and this makes the warm air rise. Colder air‚ which in turn is less dense‚ then replaces the warmer air‚ which has risen. The plate then heats this colder air‚ which will eventually
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The Synthesis and Determination of Empirical Formula for Magnesium Oxide Aim: To determine the empirical formula for magnesium oxide. Data Collection: Table 1 Mass of empty crucible‚ crucible + Mg (roughly 1cm pieces of a 15-cm piece of magnesium ribbon)‚ and crucible +MgxOy. (mass measured with an analytical balance). The mass of crucible + MgxOy was obtained after a continuous process of heating‚ letting cool‚ heating with water enough to immerse the content and letting cool of the Mg. Mass
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