Master Chemistry with Fun Quizzes & Brain Teasers!

what will be the final result (how much ice/water/steam and what temperature) when you mix together equal parts ice at 0o c and steam at 100o c?
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assuming complete dissociation of the soluble salts, which solutions would have the same boiling point as 0.040 m in water? is a nonelectrolyte.
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the radioactive element francium undergoes a series of nuclear decays, eventually forming a stable isotope of lead. one part of the process involves francium-221 undergoing two alpha decays, followed by a beta decay. 1st attempt see hint what is the element formed after this portion of the decay series?
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)the decomposition of dinitrogen pentoxide is described by the chemical equation2 n2o5(g) 4 no2(g) o2(g)if the rate of appearance of no2 is equal to 0.560 mol/min at a particular moment, what is the rateof appearance of o2 at that moment?2)a)0.280 mol/minb)1.12 mol/minc)2.24 mol/mind)0.140 mol/min
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hcfc refrigerants are: a) more harmful to the stratospheric ozone than cfcs b) as harmful to stratospheric ozone as cfcs c) less harmful to stratospheric ozone than cfcs d) not harmful to stratospheric ozone
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a certain liquid has a normal boiling point of and a boiling point elevation constant . calculate the boiling point of a solution made of of urea () dissolved in of . round your answer to significant digits.
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sr-90 may be produced from an atomic bomb explosion. the half-life of sr-90 is 28.8 years. what fraction of the sr-90 originally produced by the first atomic bomb in july 1945 still remains as of july 2033?
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the epicardial fat pad . a. can be mistaken for a pericardial effusion b. appears heteroechoic and moves with the heart c. is always visible in all cardiac views d. all of the above e. a and b onl
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which one of the following ionic compounds has an incorrect formula or is not named correctly? which one of the following ionic compounds has an incorrect formula or is not named correctly? co2o3, cobalt(iii) oxide mgs, magnesium sulfide coo2, cobalt(iv) oxide cu2s, copper(ii) sulfide cuo, copper(ii) oxide
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one mole of h2o(g) at 1.00 atm and 100.8c occupies a volume of 30.6 l. when 1 mole of h2o(g) is condensed to 1 mole of h2o(l) at 1.00 atm and 100.8c, 40.66 kj of heat is released. if the density of h2o(l) at this temperature and pressure is 0.996 g/cm3 , calculate de for the condensation of 1 mole of water at 1.00 atm and 100.8c.
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which of the following describes a physical property of copper metal? answer unselected at high temperatures, copper forms a black copper oxide. unselected copper metal is ductile. it can be ulled into thin wires. unselected copper slowly oxidizes to form a green patina, like that on the statue of liberty. unselected copper does not react with water.
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carbon dioxide (co2 ) concentrations over the past 800,000 years question 80 options: reached its maximum about 325,000 years before present. fluctuated over time, but have been increasing since the industrial revolution. were much higher in the past than the present. have remained relatively constant.
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all compounds that have a plane of symmetry are known as meso compounds question 3 options: true false
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what type of bonding orbital is always formed between hydrogena nd another atom in a covalent compound
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what is the difference between an ore vein and a disseminated deposit? which ones are easier to mine?
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when an ice cube melts in a glass of water, does the water level increase, decrease or stay the same?
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if a nitrogen atom and a slightly heavier oxygen atom have equal average speeds, which has the greater kinetic energy?
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uppose there are 5 chemists and 10 mathematicians in a room. a) how many ways can you select six people from the room?
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consider the following oxides: so2so2 , y2o3y2o3 , mgomgo , cl2ocl2o , and n2o5n2o5 . how many are expected to form acidic solutions in water?
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the half-life of a radioactive substance is 88 years. if you start with some amount of this substance, what fraction will remain in 139 years?
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what is the expected boiling point of a solution prepared by dissolving 4.46 g of sodium iodide (nai) in 51.8 g of water (h2o)? for water, tb
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analyze. what was the importance of a control in your experiment? what would you conclude if the color of the solution in the control changed?
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a student mixes their aqueous reaction mixture with dimethyl sulfoxide to perform a liquid-liquid extraction (see relevant information below). after shaking the mixture in a separatory funnel and allowing the mixture to settle, which best describes the outcome?
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calculate the number of vacancies per cubic meter in gold at 900 o c. the energy for vacancy formation is 0.98 ev/atom and the density and atomic weight for au are 19.32 g/cm3 and 196.9 g/mol, respectively
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