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Find the number of moles in 6120 ions of NaCl . Round your answer to two decimal places. Input your answer as 1.03E23, which is the same as 1.03 x 10^23
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What is true about the particles in a substance? Select all that apply.Particles in all states of matter are arranged closetogether.Heating a substance can cause the substance tochange state.The way particles move changes when thesubstance's thermal energy changes.Particles in all states of matter are constantlymoving.Submit
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g You have decided to add ethidium bromide directly to your agarose solution before you pour you gel. You have a stock solution of 6 mg/ml and you want a final concentration of 0.5 g/ml in your 50 ml agarose solution. Calculate how much of the stock solution you will need to make add to the agarose solution to give you a final concentration of 0.5 g/ml.
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We see below that 3-methyl-3-hexanol can be synthesized from the reaction of 2-pentanone with ethylmagnesium bromide. There is a scheme of a chemical reaction, where CH3CCH2CH2CH3, with an O atom double-bonded to the second (from left to right) carbon (2-pentanone) reacts with CH3CH2MgBr (ethylmagnesium bromide). The arrow goes from the single bond between CH3CH2 and MgBr to the second C atom of 2-pentanone. The second arrow goes from the double bond between the second C atom and the O atom of 2-pentanone to the O atom. An intermediate is CH3CCH2CH2CH3, with a CH2CH3 group and an O minus MgBr plus group attached to the second carbon. In the presence of H3O plus the intermediate goes to CH3CCH2CH2CH3, with a CH2CH3 group and an OH group attached to the second carbon (3-methyl-3-hexanol, a tertiary alcohol). What other combinations of ketone and Grignard reagent could be used to prepare the same tertiary alcohol
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10. Imagine that the unknown solution contains aqueous ammonium sulfate, which is commonly used in fertilizer. For the precipitation of barium sulfate after mixing aqueous ammonium sulfate solution and barium chloride solution (the reactants), write the (1) balanced molecular equation, (2) the complete ionic equation, (3) the net ionic equation AND identify the spectator ions, if any.
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Solution of an unknown concentration that has another solution slowly added to it _____________. A reagent added to the analyte solution that changes color when the reaction is complete ___________. Glassware that allows a solution to be precisely and slowly added to another solution ____________Solution of known concentration that is slowly added to a solution of unknown concentration ____________ When the required amount of one solution has been added to the second solution to complete the reaction __________ Process of slowly adding a solution to react with another solution and determine the concentration of one of the solutions based on the reaction between them _________
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The vapor pressure of liquid hexane, C_6 H_14, is 40.0 mm Hg at 271 K. A sample of C_6 H_14 is placed in a closed, evacuated container of constant volume at a temperature of 400 K. It is found that all of the C_6 H_14 is in the vapor phase and that the pressure is 74.0 mm Hg. If the temperature in the container is reduced to 271 K, which of the following statements are correct? Choose all that apply. a) Liquid hexane will be present. b) Some of the vapor initially present will condense. c) Only hexane vapor will be present. d) No condensation will occur. e) The pressure in the container will be 50.1 mm Hg.
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A variation of the indicator-dilution method (see preceding problem) is used to measure total blood volume. A known amount of a tracer is injected into the bloodstream and disperses uniformly throughout the circulatory system. A blood sample is then withdrawn, the tracer concentration in the sample is measured, and the measured concentration [which equals (tracer injected)/(total blood volume) if no tracer is lost through blood vessel walls] is used to determine the total blood volume. In one such experiment, 0.60 \mathrm{cm}^{3}0.60cm 3 of a solution containing 5.00 mg/L of a dye is injected into an artery of a grown man. About 10 minutes later, after the tracer has had time to distribute itself uniformly throughout the bloodstream, a blood sample is withdrawn and placed in the sample chamber of a spectrophotometer. A beam of light passes through the chamber, and the spectrophotometer measure the intensity of the transmitted beam and displays the value of the solution absorbance (a quantity that increases with the amount of light absorbed by the sample). The value displayed is 0.18. A calibration curve of absorbance A versus tracer concentration C (micrograms dye/liter blood) is a straight line through the origin and the point (A=0.9, C=3 \mu \mathrm{g} / \mathrm{L})(A=0.9,C=3g/L). Estimate the patient's total blood volume from these data.
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Find the concentration of the saline solution in terms of % by mass using your exact mass of NaCl, the volume of water (80.0 mL), and density of water being 0.9981 g/mL1) Calculate the predicted (theoretical) concentration of the saline solution in terms of % by mass using your exact mass of NaCl, the volume of water (80.0 mL), and density of water being 0.9981 g/mL. Show the calculation in detail with the corresponding units of measurement and the appropriate sig. figs. The mass of NaCl used was 17.518 g.2) Use the information to calculate the experimental value for the concentration (% by mass) of your saline solution based on your experimental value for density obtained with the volumetric pipette. You must show ALL the work and the calculation leading to the result in detail for full credit. The graph equation given is y=(0.0076x) + (0.9935) where y= density, x= Concentration and the density of solution using one experimental value for volumetric pipette;1.08
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Vacuum-packaging food is an effective means for stopping the growth of bacteria.true or false
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When collecting gases over water, it is important that:A. the reaction flask be sealed from the atmosphereB. the gases do not react with water moleculesC. the collection flask is only partially filled with waterD. all of the above
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In the modern periodic table shown in Figure 1 above, find the element named lead (Pb). How many protons do atoms of lead have? To which class of elements does lead belong?
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___________ miles per second is the speed of light as it travels in space.
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Fill in the blanks to create the lesson question,which is the broad question about gases thatBoyle's law answers. You will explore thisquestion in the lab experiment.Lesson Question: What is the effect ofV pressure v on the volume of a gas?3COMPLETELIDHypothesis: If the pressure on a gas is increased,then its volume willbecausethe gas molecules willDONEIntro
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A student does a PCR to make copies of the HDR template transformation. They column-clean the PCR, eluting in 20 ul of warm elution buffer. They use 2 ul of the 20 ul stock to nanodrop the sample, and determine the concentration is 60 ng/ul. How many nanograms of HDR template does the student have left to use for future work (e.g. yeast transformations)
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Please help me ..If you don't have a question or something to say just comment don't steal my points . It's not fair. Here are the questions:
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Which process is responsible for changing the composition of rock?erosionabrasionchemical weatheringmechanical weathering
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What mass of krypton gas has a volume of 2.33 L at 53C and 311 kPa?
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What occurs to the atoms of reactants in a chemical reaction?
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The nuclide Rn-204 is the daughter nuclide resulting from the decay of whatparent nuclide?A) Po-200B) Th-206C) Hg-297D) Ra-208E) ^4He
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Draw the organic product(s) formed when CH3CH2CH2OH is treated with each reagent. a. H2SO4 e. SOCl2, pyridine i. [1] TsCl, pyridine; [2] NaSH b. NaH f. PBr3 j. POCl3, pyridine c. HCl ZnCl2 g. TsCl, pyridine d. HBr h. [1] NaH; [2] CH3CH2Br
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Draw a bond-line structure for CH3CH2O(CH2)2CH(CH3)2.Include Lone Pairs in your answer.
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11. Imagine that the unknown solution contains potassium bicarbonate, which is frequently used as a pH buffering agent in foods and medications, and like sodium bicarbonate, will react with an acid. For the reaction between potassium bicarbonate solution and acetic acid solution (the reactants), write the (1) balanced molecular equation, (2) the complete ionic equation, (3) the net ionic equation AND identify the spectator ions, if any.
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The equation shows the reaction between magnesium and chlorine to produce magnesium chloride.Mg + Cl2 MgCl2Magnesium chloride consists of Mg2+ and Cl ions.Describe, in terms of electrons, how magnesium chloride is produced from magnesium and chlorine.
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