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Exam 1: Fundamental Concepts of Chemistry

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Question 41

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What is the correct formula for molecular oxygen?

A) O
B) 2O
C) O₂
D) O²
E) O₃

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Question 42

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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?

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Question 43

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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?

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?

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

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) ‪ -Rhodium metal recently was selling for $105.15 per gram. What is the price for a pound of rhodium metal in dollars?

Solve mass-number-molar mass-type problems.

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?

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?

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?

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"?

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

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

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?

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)

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