Master Chemistry with Fun Quizzes & Brain Teasers!

Which of the following alkyl halides would afford the indicated product upon reaction with sodium ethoxide? I II III or IV?
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Which scientist developed the planetary model that stated electrons were found in specific energy levels around the nucleus?a. Earnest Rutherfordb. Max Planckc. Neils Bohrd. James Cahdwicke. J.J. Thompson
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How does the study of fossils support the theory of evolution?
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Which of the following is a property of carbon atoms? They readily give up two electrons to become stable. They can form covalent bond with other atoms. They have six valence electrons. They are chemically inert.
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What does the word centripetal meana.center seekingb.continuousc.gravitationald.free falling
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6. Balance the following equations (show work for TWO)Na + _MgF2NaCl_Mg +_Na +-HCI02_C2H6+____02_NaF + Mg_Na+_ _C12_MgCl2 + H2Na20_CO2+_H20
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Which molecule contains the largest bond angle?CH4HONH3CH4
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before glass electrodes and ph meters became widely used, ph was often determined by measuring the concentration of the acid and base forms of the indicator colorimetrically. if bromothymol blue is introduced into a solution and the concentration ratio of acid to base form is found to be 1.36, what is the ph of the solution? ph
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explain and describe why the orbitals in a given shell of hydrogen are degenerate but why this is not the case for other atoms
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in a covalent bond between nitrogen and oxygen, which atom will be partially negative (i.e. has the greater electronegativity)
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your inclunation to use the same soutions to solve similar problems is known as, while using the same solution for two diffrent problems that hold the same structure is known as
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a sample of ammonia, nh3, is completely decomposed to nitrogen and hydrogen gas. calculate the partial pressure of nitrogen if the total pressure after the reaction is 741 torr
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which metal cation is the best oxidizing agent? which metal cation is the best oxidizing agent? fe2 fe2 fe3 fe3 cr3 cr3 zn2
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a student standardizes a solution of aqueous naoh against a measured mass of solid potassium hydrogen phthalate. she then uses this naoh solution to titrate a measured mass of an unknown monocarboxylic acid to its phenolphthalein endpoint to determine its molar mass. which errors will lead to a value of the molar mass that is too high? i. the potassium hydrogen phthalate is partially hydrated. ii. the naoh solution is allowed to stand after being standardized and absorbs some carbon dioxide from the air.
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which statement is true about the physical conditions required for convection to occur? group of answer choices heating from below, which raises density and causes a tendency for the heated material to rise. heating from below, which reduces density and causes a tendency for the heated material to rise. freezing; convection can occur only in solids. melting; convection can occur only in liquids.
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when aqueous solutions of iron(iii) sulfate and potassium phosphate are combined, solid iron(iii) phosphate and a solution of potassium sulfate are formed. the net ionic equation for this reaction is:
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Predict the product of the following Wittig reaction. Be sure your answer accounts for stereochemistry, where appropriate. If multiple stereoisomers form, be sure to draw all products using appropriate wedges and dashes 1. PPh3 5-iodo-1-phenyl-1-pentanone 2. n-Buli 1st attempt l See Periodic Table See Hint e stereoisomers form, be sure to draw all products using appropriate wedges and dashes.
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For a laboratory exercise in class, a student is given a mixture of small pieces of iron, sand, water, and salt. what physical property could be used to best separate the iron from the other ingredients?a.Solubilityb.Magnetismc.Melting Pointd.Electrical Conductivity
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A "calorie" is a unit of energy, defined as the amount of energy needed to raise the temperature of one gram of water by one degree Celsius. The nutritional labels on food products typically tell you how many calories of digestible energy are in one serving of food, where "digestible" means that the energy stored in the chemical bonds of the molecules comprising the food can be extracted by your body. (Water for example has energy, but that energy is not chemically accessible via digestion.) To simplify understanding for typical consumers, the "calories" reported on nutritional labels actually represent kilocalories: a 170 calorie can of beer actually contains 170,000 calories of digestible energy i) i. If a student foolishly decides to binge drink 21 beers on their 21t birthday, how many gallons of water could they have heated from room temperature (24 C) to boiling (100 C) using an equivalent amount of digestible energy in the beer? Recall that one gallon of water is roughly 8 pounds ii) ii. What is this energy equivalent to in BTU? A "BTU" or British Thermal Unit is also a unit of energy, defined as the amount of energy needed to raise the temperature of one pound of water by one degree Fahrenheit iii) iii. If you had purchased an equivalent amount of electrical energy in kW-hr from the utility company, how much would you have to pay? Is this cheaper than buying beer? A kW-hr ypically costs 10 cents
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What is the concentration ofthe bromide ion if25.0 ml of a 0.50 m aibr3 solution combines with 40.0 ml of a 0.35 m nabr solution? assume volumes are additive.
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Which scientist help developed the current model of the atom which states that electrons are located in regions known as orbitals or electron clouds?a. Neils Bohrb. Erwin Schrodingerc. Earnest Rutherfordd. Max Plancke. James Cahdwick
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calculate the volume the gas will occupy if the pressure is increased to 1.89 atm while the temperature is held constant.
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when a system is at equilibrium, which of the following values are always equal? a the rate of the forward and reverse reactions b the rate of the forward reaction and the concentration of the reactants c the concentrations of the reactants and products
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the reaction of 4-methylcyclohexanone with ch3mgbr followed by neutralization gives two alcohols. these two alcohols are multiple choice constitutional isomers. enantiomers formed in equal amounts. enantiomers formed in unequal amounts. diastereomers.
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