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# Given the following thermochemical equations, calculate delta H for

Question Given the following thermochemical equations, calculate delta H for the decomposition of one mole of acetylene(C2H2(g)) to its elements in their stable state at 25oC at 1 atmosphere.C2H2(g) 5/2O2(g) = 2CO2(g) H2O(l) H = -1299.5 kJ C(s) O2(g) = CO2(g) H = -393.5 kJ H2(g) 1/2O2(g) = H2O(l) H = -285.8 kJPart B: Write the proper thermochemical equation for the formation of one mole of nitrogen dioxide(gas) from its elements in their stable state at 25oC at 1 atmosphere.

## Use the following equation to answer the following questions: Al

Question Use the following equation to answer the following questions:

Al Pb(NO3)2 = Al(NO3)3 Pb a. Balance the above equation b. Using the above balanced equation, if you had 10 moles of Al, how many moles of Pb(NO3)2 would you need? * moles of Pb(NO3)2 _______________________________________ c. Using the balanced equation, if you had 75.000 g of Al, how many grams of Pb(NO3)2 would you need? d. Using the balanced equation, if you had 75.000 g of Al, how many moles of Al(NO3)3 would be produced(assuming you had enough Pb(NO3)2 )? e. Based on your answer in “d”, what is the theoretical yield of Al(NO3)3 in grams, and if you actually produced 500.00 grams of this material, what is the % yield?

## For a classroom demonstration, a Chemistry teacher puts 5 mL of water

Question For a classroom demonstration, a Chemistry teacher puts 5 mL of water into a soft plastic pop bottle and, with tongs, holds it in a hot water bath for 1 minute. The teacher removes the bottle and tightly screws on the cap. -Describe what will happen to the pop bottle as it cools. -Use the Kinetic Molecular Theory to explain the predicted observation.

## 5.025 g of calcium is burned in air to produce a mixture of two ionic

Question 5.025 g of calcium is burned in air to produce a mixture of two ionic compounds, calcium oxide and calcium nitride. Water is added to this mixture. It reacts with calcium oxide to form 4.832 g of calcium hydroxide. How many g of calcium oxide and calcium nitride are formed? 2 Ca O2 2CaO 3 Ca N2 Ca3N2 CaO H2O Ca(OH)2

## Zinc and sodium metal each react with sulfuric acid according to the following equations.

Question Zinc and sodium metal each react with sulfuric acid according to the following equations. Zn(s) H2SO4(aq)⟶ZnSO4(aq) H2(g)2Na(s) H2SO4(aq)⟶Na2SO4(aq) H2(g)A 24.62 g mixture of zinc and sodium is reacted with a stoichiometric amount of sulfuric acid. The reaction mixture is then reacted with 247 mL of 1.90 M barium chloride to produce the maximum possible amount of barium sulfate. Determine the percent sodium by mass in the original mixture.If 94.56 mL of sulfuric acid was added, what was the concentration of the sulfuric acid?

## 1: Which are characteristics of the three types of polyethylene

Question Question 1: Which are characteristics of the three types of polyethylene discussed in this unit? (Select all answers that apply.)a. High-density polyethylene is tough and can be used to make bottle caps.b. Low-density polyethylene is not packed together as tightly as HDPE and will change shape on heating.c. Linear low-density polyethylene is made up of ethylene connected in a straight line structure.Question 2: What is the polarity of a molecule that exhibits a bent shape around the central atom and has nonpolar covalent bonds?a. Nonpolar moleculeb. Polar moleculec. Cannot be determined without knowing the elements involved.Question 3: Which of the following are true statements? (Select all answers that apply.)a. Hydrocarbons combine with oxygen in the air to produce carbon dioxide, water and heat energy.b. Alkynes can exhibit cis-trans isomerism.c. Benzene is an example of a hydrocarbon.Question 4: The pH of an aqueous solution of Acid Y is less than the pH of a similar solution of Acid X in water. Which of the following is (are) true statements about these materials? (Select all answers that apply.)a. Both solutions have a pH less than 7.b. Acid X is a stronger acid than Acid Y.c. Acid Y solution has a greater number of hydronium ions in solution when compared to the Acid X solution.Question 5: Which of the following refers to an ‘addition reaction’? (Select all answers that apply.)a. The reaction of chlorine with an alkene to produce one product called an alkyl halide.b. The reaction of hydrogen with an alkene to produce one product called an alkane.c. The reaction of chlorine with benzene to produce a substituted benzene and HCl.Question 6: Which of the following is correct when looking at the current model of atomic structure? (Select all answers that apply.)a. Protons and neutrons are in the nucleus of the atom.b. The mass of the electron ‘cloud’ is very small.c. The electron ‘cloud’ makes up most of the ‘volume’ of the atom.d. The nucleus is positively charged.Question 7: Which of the following is the correct relationship between the number of grams of the compound, CO2, and the number of molecules of the compound?a. 44.01 grams = 6.02 x 1023 moleculesb. 44.01 grams = 1 moleculec. 32.00 grams = 6.02 x 1023 moleculesd. 32.00 grams = 1 molecule

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