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Exam 1: Fundamental Concepts of Chemistry

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Question 41

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Use the following information for Questions 3.785 L = 1 gallon; 2.2 lbs = 1 kg; V = EQ \F(4,3) ?r^3; 1 in = 2.54 cm; 1 mile = 1.609 km; 12 in = 1 ft; 1 yard = 3 ft; 1 gal = 3.785 L; ?C = 5/9 (?F - 32) proton $\quad$ charge = +1.6022 x 10^-19 C $\quad$ mass = 1.6726 x 10^-27 kg electron $\quad$ charge = -1.6022 x 10^-19 C $\quad$ mass = 9.1094 x 10^-31 kg neutron $\quad$ charge = 0 $\quad$$\quad$$\quad$$\quad$$\quad$$\quad$ mass = 1.6749 x 10^-27 kg -Four different target shooters fired five shots at targets and their results are shown below. Which of the following statements best describes the precision and accuracy of each "marksman"?

A) A is accurate and precise, C is inaccurate and precise.
B) B is imprecise and inaccurate, D is accurate and imprecise.
C) A and D have similar precision but A is more accurate.
D) C and D have similar accuracy, but D is more precise.

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Question 42

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Ethylene glycol is used in automotive antifreeze and in polymers such as Dacron and other polyesters. It is produced by the hydration of ethylene oxide as shown below: How much ethylene glycol can be produced from 5.02 x 10⁴ g of ethylene oxide?

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Question 43

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What are the names of the elements with the following symbols? Mn, Mg, Md, Rn, Ra

Use the following information for Questions 3.785 L = 1 gallon; 2.2 lbs = 1 kg; V = EQ \F(4,3) πr^3; 1 in = 2.54 cm; 1 mile = 1.609 km; 12 in = 1 ft; 1 yard = 3 ft; 1 gal = 3.785 L; ˚C = 5/9 (˚F - 32) ‪ -Rhodium metal recently was selling for $105.15 per gram. What is the price for a pound of rhodium metal in dollars?

Cumene is an important industrial chemical used in the manufacture of acetone and phenol. The line structure is shown below: What is the correct molecular formula for cumene?

Balance the following chemical reaction, which illustrates the synthesis of an important industrial chemical: __ NaCl _(s) + __ H₂SO_{4 (aq)} $\rarr$ __ Na₂SO_{4 (s)} + __ HCl _(g)

Acetone, most generally known as a component of fingernail polish remover, can be manufactured by the following reaction, the dehydrogenation of isopropanol: Catalyzed by either zinc oxide or copper/zinc metal, the reaction gives an 80% yield of product. How much isopropanol is needed to prepare 9.5 x 10⁴ kg of acetone?

When 500 ml of 0.75 M AgNO₃ solution is reacted with 250 ml of 2.3 M KCl, a white AgCl precipitate forms. AgNO₃(aq) + KCl(aq) $\rarr$ AgCl(s) + KNO₃(aq) What mass of precipitate is recovered?

Calculate the molar mass of terephthalic acid, whose line structure appears below:

Which is greater: the number of molecules of C₆H₆ in 1.0 x10^-6 g or the number of moles of C₆H₆ in 1.05 x 10¹⁰ kg?

Solve mass-number-molar mass-type problems.

Determine the molecular formula and draw the line structure of 2-bromo-3-pentanol.

Use the following information for Questions . 1 mole = 6.022 x10²³ particles -The density of a particular 300 cm³ graphite sample is 2.16 g cm^-3; how many atoms are contained in the sample?

Determine the molecular formula and draw the line structure for 2-bromobutane.

Name three macroscopic properties of orange juice.

Use the following information for Questions 3.785 L = 1 gallon; 2.2 lbs = 1 kg; V = EQ \F(4,3) πr^3; 1 in = 2.54 cm; 1 mile = 1.609 km; 12 in = 1 ft; 1 yard = 3 ft; 1 gal = 3.785 L; ˚C = 5/9 (˚F - 32) ‪ -A flask with a mass of 160.342 g is filled with 22° C water. The mass of the flask filled with water is found to be 310.5 g. Given that the density of water at 22°C is 0.99780 g/cm³, what is the volume of the flask?

Urea is used as a source of nitrogen in fertilizer. The second step of the synthesis is heating the intermediate ammonium carbamate to produce urea shown in the equation below: NH₂CO₂ $\rarr$ NH₄ O) NH₂ + H₂O The reaction proceeds in 60% yield, on average, and the product is mixed with unreacted starting materials, which are readily separated from the product. They can then be recycled and undergo the process again. If one starts with 1 kg of ammonium carbamate, how many times will it have to be cycled through this reaction to give at least a 90% yield?

Use the following information for Questions 3.785 L = 1 gallon; 2.2 lbs = 1 kg; V = EQ \F(4,3) πr^3; 1 in = 2.54 cm; 1 mile = 1.609 km; 12 in = 1 ft; 1 yard = 3 ft; 1 gal = 3.785 L; ˚C = 5/9 (˚F - 32) ‪ -You fill your car up in Jamaica and it takes 42.3 L of gasoline. How many gallons is this amount?

Determine the formula of a compound whose molecules each contain two atoms of carbon, two atoms of oxygen and six atoms of hydrogen.

What is the correct formula for molecular oxygen?