Chemistry

What is the mass in grams of 1.00 mol?
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Why is a molecule of co2 nonpolar even though the bonds between the carbon atom and the oxygen atoms are polar?.
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Is chocolate being melted a physical or chemical change?
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strontium 38sr90 has a half-life of 29.1 yr. it is chemically similar to calcium, enters the body through the food chain, and collects in the bones. consequently, 38sr90 is a particularly serious health hazard. how long (in years) will it take for 99.9778% of the 38sr90 released in a nuclear reactor accident to disappear?
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Identify subatomic particles Question The prefix in subatomic tells us that subatomic particles are: Select the correct answer below: O particles made of atoms O the basic building blocks of atoms 2 O particles of similar size to atomsO particles that power nuclear submarines FE Type here to search
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How do you graph a parabola function?
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The diagrams above show the ultraviolet absorption spectra for two compounds. Diagram 1 is the absorption spectrum of pure acetone, a solvent used when preparing solutions for an experiment. Diagram 2 is the absorption spectrum of the solute for which the absorbance needs to be measured to determine its concentration. When the student reads the absorbance of the solution at 280 nm, the result is too high. Which of the following is most likely responsible for the error in the measured absorbance?answer choicesThe student added too little solute to the acetone before measuring its absorbance.The student rinsed the cuvette with the solution before filling the cuvette with the solution.The student forgot to calibrate the spectrophotometer first by using a cuvette containing only acetone.The wavelength setting was accidentally changed from 280 nmto 300 nm before the student made the measurement.
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Describe how to prepare 400 grams of a 15% (mass/mass) aqueous solution of KBr.
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How is Mg different from MgO?
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Which solute will lower the freezing point of 1 kg of water to 3.72 C?
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What is the chemical reaction between cornstarch and water?
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Bromine is one of the few elements that is a liquid at room temperature. It vaporizes easily and has a beautiful red color in both the liquid and gaseous states. Bromine reacts readily with hydrogen gas to make hydrogen bromide. One way to represent this equilibrium is 2 HBr(g)H2(g) + Br2(g) We could also write this reaction three other ways, listed below, The equilibrium constants for all of the reactions are related. Write the equilibrium constant for each new reaction in terms of K, the equilibrium constant for the reaction above 1) 1/2 H2(g) + 1/2 Br(g)HBr(g) K1 = _____________ 2) H2(g) + Br2(g) 2HBr(g) K2 = _____________ 3) HBr(g)1/2 H2(g) + 1/2 Br2(g) K3 = ___________
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_CH3CH2OH+_O2->_ CH2+_H2OBalance Equation
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how is a new element formed in a star
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draw lewis symbols for the most stable ion formed by: sodium, oxygen, calcium, and chlorine.
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The reaction _____ provides information about the individual steps of a reaction, and identifies any reaction _____, which are formed during one step and consumed in a subsequent step.
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what did the photoelectric experiment demonstrate?
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What is the first step of enzyme action?
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which of the following will not show geometric (cis-trans) isomerism? a. 3-ethyl-3-heptene b. 4-ethyl-2-heptene c. 4-ethyl-3-heptene d. 5-ethyl-2-heptene
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The percent composition by mass of some compounds is 32.01% C 4.03% H and 63.96% O. given that the molecular mass of the same compound is 150 amu determine its: a) empirical formula b) molecular formula
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Which sets of structures are homologous?
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What are 3 ways you can determine if a compound is ionic or covalent?
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Boron consists of two naturally occurring isotopes, 10B which has a mass of 10.012 a.m.u and 11B which has a mass of 11.009 a.m.u. The atomic weight of boron is 10.81 a.m.u. Calculate the percentage composition of each isotope.
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Consider the equilibrium above. Which of the following changes wil increase the concentration of Hgl4? 2-2 O Increase the concentration of hydroxide O Increasing the mass of Hg present O Adding a catalyst O Adding 6 M HI O Incrcasing the temperature
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