Master Chemistry with Fun Quizzes & Brain Teasers!

An electron is released from rest in a uniform electric field of magnitude 2.010 4N/C. Calculate the acceleration of the electron. ( Ignore gravitation.)
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A calorie is defined as the amount of energy required to raise the temperature of one lb of water by one degree celsius.a. Trueb. False
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Draw structures corresponding to each of the given names. 1. 12-crown-4 2. diethyl ether 3. 2,2,2-trichloroethanal (chloral) 4. trans-3-isopropylcyclohexanecarbaldehyde 5. 5,5-dimethyl-1,3-cyclohexanedione (dimedone) 6. 2-cyclohexenone.
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Water is essential for life and is important for plant growth and function. which property of water is most responsible for its ability to move from the root of a plant to the stem?
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A btu is defined as the amount of energy required to raise the temperature of one lb of water by one degree celsius.a. Trueb. False
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a lewis structure for the acetate ion is shown here: the ion is ch3co with an o atom double-bonded to the second (from left to right) carbon. the double-bonded o atom has two lone pairs. the other o atom has three lone pairs. the overall charge of the ion is 1 minus. which structure is the best resonance structure for the acetate ion?
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what atomic or hybrid orbital on b makes up the sigma bond between b and f in tetrafluoroborate ion , bf4-
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the measurable properties of a substance, such as vapor pressure and surface tension, occur due to the strength of .(1 point)
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how many moles of zinc are in 4.20 kg of zinc? express your answer to three significant figures and include the appropriate units.
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which physical evidence in a fire indicates burning vegetable matter? blue-orange smoke white smoke green-purple smoke black smoke
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what is the relationship between the edge length of a unit cell and atomic radius in a hexagonal closest packed crystal structure?
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if 2.75l n2 reacts with 7.75l h2, what is the theoretical yield (in liters) of nh3? assume that the volumes of reactants and products are measured at the same temperature and pressure.
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calculate the standard gibbs free energy associated with the formation of ammonia from nitrogen and hydrogen at 25 c and 500 c
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when preparing sequencing-reaction tubes, each of the four dntps are added, but just one kind of ddntp. which are used in the highest concentrations, the dntps or the ddntps, and why?
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a mixture of argon and krypton gases, at a total pressure of 768 mm hg, contains 3.31 grams of argon and 21.7 grams of krypton. what is the partial pressure of each gas in the mixture
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calculate the osmotic pressure of a solution containing 24.2 g of glycerin (c3h8o3) in 260.0 ml of solution at 290 k . express your answer in atmospheres to three significant figures.
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the radioactive decay of a sample containing an unknown radioactive isotope produced 9062 disintegrations per minute. 15.06 days later, the rate of decay was found to be 2421 disintegrations per minute. calculate the half-life in days for the unknown radioactive isotope.
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cluster decay is a type of radioactivity like alpha decay, except instead of spitting out a helium nucleus, it expels something bigger. what is the atom resulting from uranium-235 (u) emitting a magnesium-28 (mg) nucleus? (write your answer in the standard u-235 format.)
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rutherford performed an experiment in which alpha particles were shot at a thin gold foil. about how many of the alpha particles bounced backward from the gold foil? a. 1/10 b. 1/100 c. 1/500 d. 1/1000 e. 1/10,000
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If a sample of a radioactive isotope has a half-life of 1 year,how much of the original sample will be left at the end ofthe second year? What happens to the rest of the sample?
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Write the overall balanced cell reaction for the following voltaic cell Fe(s) | Fe2+ (aq) || Ag + (aq) | Ag(s) (Ctrl).
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Diazomethane is a toxic yellow gas that is both sensitive and explosive: However, it is a useful reagent in the laboratory to make key intermediates by reacting with carboxylic acids in a quick and clean reaction_ Draw the expected organic product of diazomethane with the following carboxylic acid. COOH Hc N=N; CH3
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For the following diels-alder reaction, identify the diene, the dienophile, and the diels-alder adduct
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identify the following amino acids and their 3-letter and 1-letter abbreviations.
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