Chemistry

to make 400 gram solution with a mass by a mass concentration of 6 % how much salt and water you need to mix
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Which of the following is a reduction half-reaction?
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Assume you have 4 solids (A, B, C and D) of similar mass. Which of these requires the greatest energy input to melt?polar covalentcovalent networkionic compoundnonpolar covalent
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Activation energy is:A. The energy needed to begin breaking the bonds of reactants.B. None of these.C. The maximum amount of energy reactants can hold.D. The energy needed to begin breaking the bonds of products.
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Stickleback fish are collected from a lake in Alaska. 600 from the sample are spineless, which is a recessive trait in the fish. 80 of the fish collected have spines. Calculate:
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An inorganic salt is composed of 17.6% sodium, 39.7% chromium, and 42.8% oxygen. What is the empirical formula of this salt?
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A certain amount of NaOH is dissolved in certain kilograms of solvent and molality of the solution is 0.5 m. When the same amount of NaOH is dissolved in 100 grams of less solvent than initial then molality becomes 0.625 m. Determine the amount of NaOH and the initial mass of solvent.
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If we increase the temperature of the reaction that occurs in plants to create sugar. What direction does the equilibrium shift....- Products- No change- Reactants- Plants are not capable of this
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What is the molarity of a solution that contains 0.75 mol Naci in 3.0 L of solution? Select one: O a. 4.0 M O b. 2.3 M O d. 3.8 M O d. 0.25 M Clear my choice
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A 1.732 g sample of iron is heated in air. It oxidizes to form a product with a mass of 2.205 g.What is the empirical formula of the product?
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3 molecules NaOH determine the amount of grams
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Ammonium phosphate NH43PO4 is an important ingredient in many fertilizers. It can be made by reacting phosphoric acid H3PO4 with ammonia NH3. What mass of ammonium phosphate is produced by the reaction of 5.5g of phosphoric acid
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An ordinary gasoline can measuring 30.0 cm by 20.0 cm by 15.0 cm is evacuated with a vacuum pump.1a. Assuming that virtually all of the air can be removed from inside the can, and that atmospheric pressure is 14.7 psi, what is the total force (in pounds) on the surface of the can?1b. Do you think that the can could withstand the force?
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Can compound take part in chemical reaction?
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Choose the compound below that contains at least one polar covalent bond, but is nonpolar. a. SiF4 b. SeF4 c. HCl d. ICl3 e. Both SiF4 and ICl3 are nonpolar and contain a polar covalent bond.
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Which combination of reagents used in the indicated order with benzene will give m-nitropropylbenzene? a. 1) CH3CH2CH2Cl/AlCl3, 2) HNO3/H2SO4 b. 1) HNO3/H2SO4, 2) CH3CH2CH2Cl/AlCl3 c. 1) CH3CH2CH2Cl/AlCl3, 2) HNO3/H2SO4, 3) Zn/HCl d. 1) HNO3/H2SO4, 2) CH3CH2CH2Cl/AlCl3, 3) Zn/HCl
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An analytical chemist is titrating of a solution of benzoic acid with a solution of . The of benzoic acid is . Calculate the pH of the acid solution after the chemist has added of the solution to it. Note for advanced students: you may assume the final volume equals the initial volume of the solution plus the volume of solution added.
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PLZ HELP ME WITH MY WORK
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Unknown # 41Flame Test Color: LilacAddition of HCl(aq): NR (No reaction) Addition of HCl(aq) and BaCl2(aq): NR (No reaction) Addition of HNO3(aq) and AgNO3(aq): Yellow precipitateWhat is the unknown ionic compound molecular formula?
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What are the units of molar mass?A. L/gB. mol/gC. g/LD. g/molSUBST
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How many oxygen atoms are there in 0.25 mole of CO2?
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An atom with 6 protons and 8 neutrons is an)
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Whats is inside a cell? Crossword puzzle ACROSS2.package materials from the endoplasmic reticulum & send them to other parts of the cell 4.breaks down food & old cell parts7.a stiff layer of nonliving material that surrounds a plant cell8.jellylike material found within the cell membrane 10.found in plant cell; captures the suns energy to make food 12.genetic materials that carry information about the organism13.moves materials throughout the cellDOWN1.produce proteins for the cell 3.a tiny structure inside a cell 5.controls all of the cells activities 6.produce most of the cells energy 7.controls substance that enter and leave the cell 9.creates ribosomes; found inside the..11.stores water and waste inside the cell
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In order to complete the reaction of hexyl magnesium bromide with acetone, what next step needs to be done. a. Fractional Distillation.b. Vacuum filtration.c. Aqueous workup.d. Crystallization.
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