Chemistry

what technique is used in this investigation? group of answer choices colorimetry calorimetry gas pressure measurements titration combustion analysis
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How many moles are in 6. 4 x 1024 molecules of HBr?
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cola has a ph of about 3.0. if a cola has a concentration of h2co3 of 0.005m, what is the concentration of hco- g
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a conductor is distinguished from an insulator with the same number of atoms by the number of: electrons protons nearly free atoms nearly free electrons molecules
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A sample of glucose reacts in anaerobic respiration. The right-hand box below shows a particle diagram of the moles of substances present after the reaction is complete.On a piece of paper draw the "Before" box as shown and draw a particle diagram of the reactant molecules that produced the mixture shown on the right.
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how would the rf value of eugenol change if the mobile phase was changed to 40%ethyl acetate in hexanes? briefly explain your reasoning.
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angela has an unknown quantity of gas held at a temperature of 2300 K in a container with a volume of 19 L and a pressure of 6.00 atm. How many moles of gas does angela have? a. what equation will you use? b. show all your work.
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the half-life of carbon is 5730 years. if you start with 724.8g of carbon, what mass of carbon will remain after 5730 years? please answer in grams and report your answer to one place past the decimal.
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the gas in a 225.0 ml piston experiences a change in pressure from 1.00 atm to 2.90 atm. what is the new volume (in ml) assuming the moles of gas and temperature are held constant? 7 7 . 5 9
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in a solution of dichloromethane (ch2cl2) in 2-pentanone (ch3coc3h7), the mole fraction of dichloromethane is 0.350. if the solution contains only these two components, what is the molality of dichloromethane in this solution?
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a gas has a volume of 91 ml at a temperature of 91oc. what is the volume of the gas if the temperature is reduced to 0oc at constant pressure?
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Question at position 1 What is the pressure of gas if 2.89-g of CO2 sublimates in a 9.60-L container at 255.22K
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the electronic configuration of O2is2s22p6.
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the addition of low ionic strength solution (liss) to the testing environment when performing an indirect antiglobulin test is designed to do what?
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barium has a density of and crystallizes with the body-centered cubic unit cell. calculate the radius of a barium atom.
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I NEED HELP ON THIS ASAP! PLEASE IT'S DUE TONIGHT!
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Hello, can someone help me with this AS level chemistry question?An unknown alcohol is analysed by complete combustion. When 0.250g of the alcohol is burned, 0.625g of carbon dioxide and 0.307g of water are produced.Calculate the empirical formula of the alcohol. (5 marks)
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there are several elements whose atoms make more than one type of ion. Where inthe periodic table are these elements usually found?
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Hydrogen gas and oxygen gas are reacted together as shown below to produce water. Calculate the maximum theoretical yield of water if 40g of hydrogen is used and then use your answer to work out the percentage yield if the reaction actually produces 234g of water.
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Number 5 please.Show work.
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Which of the following occurs in an endothermic reaction but not in an exothermic reaction?A. Chemical bonds are broken.B. Atoms are rearranged.C. Energy is absorbed.
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what term is used to describe the electrons in the outermost energy level
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How many atoms are in 32.10 g of He
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What is the mole ratio of C3H6O to CO? Write it as a fraction.
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