Chemistry Questions

If 4.00 g of NaCl react with 10.00 g of AgNO3, what is the excess reactant?
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Where are the heavy metals located on the periodic table
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Which compound is insoluble in water?(1) calcium bromide (3) silver bromide(2) potassium bromide (4) sodium bromide
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A substance has an empirical formula of CH2 and a molar mass of 56 grams per mole. The molecular formula for this compound is(1) CH2 (3) C4H8(2) C4H6 (4) C8H4
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The volume of 6.00M HCl needed to make 319 ml of 6.80M HCl
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A sample of an unknown substance has a mass of 89.5 g. If 345.2 J of heat are required to heat the substance from 285 K to 305 K, what is the specific heat of the substance?
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What is a key element found in CO2 and glucose?
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Which of these would be directly related to the science of ecology?A: uncovering the genetic makeup of the eastern cottontail rabbitB: developing strains of corn that can withstand a combination of drought and high windsC: learning about foods that benefit the heart and blood vesselsD: studying how the mayfly population affects the number of trout in a stream HELP!!!!!
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Which of these is a biotic factor of an aquarium ecosystem?A:algae growing on the glassB:gravel on the bottom of the aquariumC:temperature of the waterD:amount of oxygen in the water
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For the reaction:6Li(s)+N2(g)→2Li3N(s)Determine:the mass of N2 needed to react with 0.536 moles of Li.the number of moles of Li required to make 46.4 g of Li3N.the mass in grams of Li3N produced from 3.65 g Li.the number of moles of lithium needed to react with 7.00 grams of N2.
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Select all that apply.The requirements for one type of atom to substitute for another in a solid solution are:All substitutions must be limited to the same element.An atom must be identical in size.An atom must be similar in size.The substituting atom must be from the same period.The substituting atom must be from the same group.
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A few pieces of dry ice, CO2(s), at -78°C are placed in a flask that contains air at 21°C. The flask is sealed by placing an uninflated balloon over the mouth of the flask. As the balloon inflates, the dry ice disappears and no liquid is observed in the flask.State the direction of heat flow that occurs between the dry ice and the air in the flask. Write the name of the process that occurs as the dry ice undergoes a phase change in the flask. [1]Compare the entropy of the CO2 molecules in the dry ice to the entropy of the CO2 molecules in the inflated balloon.
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Which compound has the highest percent com­position by mass of strontium?(1) SrC12 (2) SrI2 (3) SrO (4) SrS
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For the reactions system 2H2(g) + S2(g) 2H2S(g), a 1.00 liter vessel is found to contain 0.50 moles of H2, 0.020 moles of S2, and 68.5 moles of H2S. Calculate the numerical value of the Keq of this system. K = Are the products or reactants favored? The equilibrium system N2O4(g) 2NO2(g) was established in a 1.00-liter vessel. Upon analysis, the following information was found: [NO2] = 0.500 M; [N2O4] = 0.0250 M. What is the value of Keq? 3.Which is the correct expression for Keq when the chemical reaction is as follows: N2 + 3H2 2NH3. 4.Reactions which do not continue to completion are called ______reactions.
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According to the wave-mechanical model of the atom, an orbital is a region of the most probable location of(1) an alpha particle (3) an electron(2) a gamma ray (4) a proton
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Which is the correct expression for Keq when the chemical reaction is as follows:N2 + 3H2 2NH3.
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He accepted value for the density of liquid mercury is 13.5336 g/mL. Four scientists measure the density of liquid mercury in their individual laboratories. The most accurate measurement is made by
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Need a correct answer fastHow many moles of solute are contained in a 500.0 milliliter solution that has a concentration of 0.35 M?
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