HighFour Chemistry Round 8 Category D: Grades Monday, April 11, 2016
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1 Question #1 The diagram shows the Lewis structure of a tetracyanoethylene molecule. How many pi bonds are there in the molecule? N C N C C = C C N C N Question #2 There are 20 common cations that can be analyzed readily in aqueous solutions. These cations can be divided in 5 groups according to the solubility products of their insoluble salts. In which group does the cation Ag + belong to? Question #3 Calculate the ph of 5.2 x 10-4 M HNO 3. Round off your answer to 1 decimal place only. HNO 3 H + + NO 3 - Question #4 What is the simplest form of the olefins, or alkenes? Question #5 Classify the following molecule as alcohol, aldehyde, ketone, carboxylic acid, amine, or ether: H 3 C CH 2 CH 2 OH
2 Question #6 The density of water is 1.00 g/ml at 4 C. How many water moles are present in 2.56 ml of water at this temperature? Round off your answer to 4 decimal places. Question #7 A radioactive substance undergoes decay as shown in the table: Time (days) Mass (g) The decay is a first-order reaction. Calculate the half-life of the reaction. Round to 2 decimal places. Question #8 Calculate the standard free-energy changes for the reaction at 25 C. 2MgO (s) 2Mg (s) + O 2(g) Note that the standard free-energy changes ( G f ) for the following substances are: G f of MgO (s) = kj/mol G f of Mg (s) = 0 kj/mol G f of O 2 (s) = 0 kj/mol
3 Question #9 What is the temperature increase ( C) of 0.85 kg of copper after absorbing 5.30 kj of heat? The specific heat of copper is Round your answer to 1 decimal place only. Question #10 Silicon tetrachloride (SiCl 4 ) can be prepared by heating Si in chlorine gas: Si (s) + 2Cl 2(g) SiCl 4(l) In one reaction, mole of SiCl 4 is produced. How many moles of molecular chlorine were used in the reaction? Round off your answer to 2 decimal places only. Question #11 Determine what type of biological process or nutrient cycle is taking place in the figure shown: Question #12 Calculate the molality of a solution containing 4.15 M NaNO 3. The density of the solution is 1.55 g/ml. Round off your answer to 2 decimal places.
4 Question #13 A sample of g of an ionic compound containing the bromide ion (Br - ) is dissolved in water and treated with an excess of AgNO 3. If the mass of the AgBr precipitate that forms is g, what is the percent by mass of Br in the original compound? Question #14 How many hydrogen atoms are there in a straight-chain alkane having 10 carbon atoms? Question #15 Monosodium glutamate (MSG), a foodflavor enhancer, has been blamed for Chinese restaurant syndrome, the symptoms of which are headaches and chest pains. MSG has the following composition by mass: Component % Composition Carbon Hydrogen 4.77 Oxygen Nitrogen 8.29 Sodium How many atoms of carbon and hydrogen are there in the molecular formula if its molar mass is 169 g? Separate your answers with a comma. Question #16 Calculate the ph of 2.8 x 10-4 M Ba(OH) 2. Round your answer to 1 decimal place only.
5 Question #17 The half-life of Rn-222 is 3.8 days. Starting with grams of Rn-222, how much will be left (in grams) after 12 half-lives? Round your answer to two decimal places only. Use the formula and to solve for the remaining Rn-222 after 12 half lives. Question #18 Calculate the standard emf of a cell that uses Ag/Ag + and Al/Al +3 half-cell reactions. The cell reactions that occur under standard-state conditions are as follows: E (in volts) Ag (s) Ag + (aq) + e - (oxidation) Al (s) Al +3 (aq) + 3e - (reduction) Question #19 The depletion of ozone (O 3 ) in the stratosphere has been a matter of great concern among scientists in recent years. It is believed that ozone can react with nitric oxide (NO) that is discharged from the high-altitude jet plane, the SST. The reaction is O 3 + NO O 2 + NO 2 If g of O 3 reacts with g of NO, how many grams of NO 2 will be produced? Round your answer to 2 decimal places. Question #20 Calculate the amount of distilled water (in kilograms) that must be added to grams of lead acetate in the preparation of a 15.7% by mass solution. Correct your answer to two decimal places.
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