The element zinc has two naturally occurring isotopes. The natural abundances and isotopic masses are \(\begin{array}{|l|l|l|} \hline \text { Isotope } & \% \text { Abundance } & \text { Isotopic Mass } \\ \hline & & \\ \hline { }^{113} \mathrm{Zn}& 4.29 & 112.904 \\ \hline { }^{115} \mathrm{Zn}& 95.71 & 114.904 \\ \hline \end{array}\) The atomic mass of naturally occurring zinc is

A) 112.990 B) 113.582 C) 113.904 D) 114.582 E) 114.818 A) 112.990 B) 113.582 C) 113.904 D) 114.582 E) 114.818 E

In a strange and alternative universe you repeat Millikan's oil drop experiment and measure the following charges on different oil drops \(\begin{array}{|l|l|} \hline 0.90^{\prime} 10^{-16} \mathrm{C} & 1.62^{\prime} 10^{-16} \mathrm{C} \\ \hline 1.08^{\prime} 10^{-16} \mathrm{C}& 1.98^{\prime} 10^{-16} \mathrm{C} \\ \hline 1.26^{\prime} 10^{-16} \mathrm{C}& 2.52 ^{\prime} 10^{-16} \mathrm{C}\\ \hline \\ \hline \end{array}\) Using this give your best estimate for the unit of fundamental charge in this alternative universe

A) 1.2×10-17 C B) 1.8×10-17 C C) 3.6×10-17 C D) 9.0×10-17 C E) 1.2×10-16 C A) 1.2×10-17 C B) 1.8×10-17 C C) 3.6×10-17 C D) 9.0×10-17 C E) 1.2×10-16 C

Two elements X and Y combine to form two compounds with the following compositions \(\begin{array}{|l|l|l|} \hline \text { Compound } & \% \text { Mass X} & \% \text { Mass Y} \\ \hline & & \\ \hline 1 & 22.56 & 77.44 \\ \hline 2& 14.87 & 85.13 \\ \hline \end{array}\) If compound 1 has the formula XY3 then a possible formula for compound 2 is

A) XY2 B) X2Y5 C) XY4 D) X2Yl9 E) XY5 A) XY2 B) X2Y5 C) XY4 D) X2Yl9 E) XY5

A 20.0 g a sample is composed of a mixture of Fe2O3 and Fe3O4. The mixture is found to contain 14.45 g of iron. What percent of the sample is Fe2O3?

A) 2% B) 22% C) 50% D) 72% E) 98% A) 2% B) 22% C) 50% D) 72% E) 98%

Naturally occurring silicon is composed of three isotopes: 28Si (atomic mass 27.98), 29Si (atomic mass 28.98), and 30Si (atomic mass 29.97). The atomic mass of the naturally occurring isotope mixture is 28.0855. The relative percentages of 28Si, 29Si, and 30Si are

A) 99.7, 0.1, 0.2 B) 92.2, 4.7, 3.1 C) 90.2, 1.3, 8.5 D) 80.2, 10.8, 9.0 E) 50.4, 20.5, 29.1 A) 99.7, 0.1, 0.2 B) 92.2, 4.7, 3.1 C) 90.2, 1.3, 8.5 D) 80.2, 10.8, 9.0 E) 50.4, 20.5, 29.1

If the density of the nucleus of gold is approximately 1×1015 g cm-3 and solid gold has a density of 19.3 g cm-3 estimate the percentage of the volume of solid gold that is "occupied" by the nucleus?

A) 2×10-12 % B) 2×10-8 % C) 2×10-4 % D) 2×10-2 % E) 2% A) 2×10-12 % B) 2×10-8 % C) 2×10-4 % D) 2×10-2 % E) 2%

Exam 1: The Atom in Modern Chemistry

The element zinc has two naturally occurring isotopes. The natural abundances and isotopic masses are Isotope \% Abundance Isotopic Mass 4.29 112.904 95.71 114.904 The atomic mass of naturally occurring zinc is

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Question 1

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Sodium chloride that is formed from a reaction of sodium vapor and chlorine gas is found to be 39.34% sodium by mass. A 4.86 g sample of sodium chloride that is purified from sea water contains how many grams of sodium?

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In Millikan's oil drop experiment, he was able to determine the charge of the electron because

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A pure substance that is composed of only one type of atom is best classified as

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Question 4

1.28 g of pure gold reacts with chlorine gas to produce 1.97 g of a red solid. A possible formula for the red solid is?

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Question 5

Which nuclide has more protons than neutrons?

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Question 6

In a strange and alternative universe you repeat Millikan's oil drop experiment and measure the following charges on different oil drops 0.91 1.61 1.01 1.91 1.21 2.51 Using this give your best estimate for the unit of fundamental charge in this alternative universe

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Question 7

Antimony has two naturally occurring isotopes with masses given in the table below. The relative atomic mass given for antimony on the periodic table is 121.75. Which of the following is true?

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Question 8

A compound is found to be 40.62% Si and 59.94% N. A possible formula for this compound is

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Question 9

Gibbsite is an aluminum ore that is composed of 34.59% Al, 3.88% H, and 61.53% O. How much aluminum can be refined from 248.0 g of Gibbsite?

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Question 10

Two elements X and Y combine to form two compounds with the following compositions Compound \% Mass X \% Mass Y 1 22.56 77.44 2 14.87 85.13 If compound 1 has the formula XY₃ then a possible formula for compound 2 is

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Question 11

In the presence of a catalyst carbon monoxide (CO) will reaction with oxygen (O₂) to form carbon dioxide (CO₂). How many liters of carbon dioxide can be formed from 1.5 L of carbon monoxide (with excess oxygen) if all the gases are held at the same temperature and pressure?

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Question 12

A 20.0 g a sample is composed of a mixture of Fe₂O₃ and Fe₃O₄. The mixture is found to contain 14.45 g of iron. What percent of the sample is Fe₂O₃?

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Question 13

A clear liquid is placed into a beaker and heated until it boils. After all of the liquid has evaporated, a white powder is found in the beaker. The original liquid is best classified as

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Question 14

Naturally occurring silicon is composed of three isotopes: ²⁸Si (atomic mass 27.98), ²⁹Si (atomic mass 28.98), and ³⁰Si (atomic mass 29.97). The atomic mass of the naturally occurring isotope mixture is 28.0855. The relative percentages of ²⁸Si, ²⁹Si, and ³⁰Si are

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Question 15

In Rutherford's experiment scattering a particles off gold foil he

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Question 16

Distillation can be used to separate single phase solutions that are:

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Question 17

What elemental isotope has 51 protons and 72 neutrons?

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Question 18

Chlorine has two naturally occurring isotopes ³⁵Cl (atomic mass 34.97) and ³⁷Cl (atomic mass of 36.96). If ions of naturally occurring Cl₂ are detected in a mass spectrometer how many peaks should be observed?

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Question 19

If the density of the nucleus of gold is approximately 1×10¹⁵ g cm^-³ and solid gold has a density of 19.3 g cm^-³ estimate the percentage of the volume of solid gold that is "occupied" by the nucleus?

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Question 20

Showing 1 - 20 of 33

Exam 1: The Atom in Modern Chemistry

The element zinc has two naturally occurring isotopes. The natural abundances and isotopic masses are Isotope \% Abundance Isotopic Mass 4.29 112.904 95.71 114.904 The atomic mass of naturally occurring zinc is

Sodium chloride that is formed from a reaction of sodium vapor and chlorine gas is found to be 39.34% sodium by mass. A 4.86 g sample of sodium chloride that is purified from sea water contains how many grams of sodium?

In Millikan's oil drop experiment, he was able to determine the charge of the electron because

A pure substance that is composed of only one type of atom is best classified as

1.28 g of pure gold reacts with chlorine gas to produce 1.97 g of a red solid. A possible formula for the red solid is?

Which nuclide has more protons than neutrons?

In a strange and alternative universe you repeat Millikan's oil drop experiment and measure the following charges on different oil drops 0.91 1.61 1.01 1.91 1.21 2.51 Using this give your best estimate for the unit of fundamental charge in this alternative universe

Antimony has two naturally occurring isotopes with masses given in the table below. The relative atomic mass given for antimony on the periodic table is 121.75. Which of the following is true?

A compound is found to be 40.62% Si and 59.94% N. A possible formula for this compound is

Gibbsite is an aluminum ore that is composed of 34.59% Al, 3.88% H, and 61.53% O. How much aluminum can be refined from 248.0 g of Gibbsite?

Two elements X and Y combine to form two compounds with the following compositions Compound \% Mass X \% Mass Y 1 22.56 77.44 2 14.87 85.13 If compound 1 has the formula XY3 then a possible formula for compound 2 is

In the presence of a catalyst carbon monoxide (CO) will reaction with oxygen (O2) to form carbon dioxide (CO2). How many liters of carbon dioxide can be formed from 1.5 L of carbon monoxide (with excess oxygen) if all the gases are held at the same temperature and pressure?

A 20.0 g a sample is composed of a mixture of Fe2O3 and Fe3O4. The mixture is found to contain 14.45 g of iron. What percent of the sample is Fe2O3?

A clear liquid is placed into a beaker and heated until it boils. After all of the liquid has evaporated, a white powder is found in the beaker. The original liquid is best classified as

Naturally occurring silicon is composed of three isotopes: 28Si (atomic mass 27.98), 29Si (atomic mass 28.98), and 30Si (atomic mass 29.97). The atomic mass of the naturally occurring isotope mixture is 28.0855. The relative percentages of 28Si, 29Si, and 30Si are

In Rutherford's experiment scattering a particles off gold foil he

Distillation can be used to separate single phase solutions that are:

What elemental isotope has 51 protons and 72 neutrons?

Chlorine has two naturally occurring isotopes 35Cl (atomic mass 34.97) and 37Cl (atomic mass of 36.96). If ions of naturally occurring Cl2 are detected in a mass spectrometer how many peaks should be observed?

If the density of the nucleus of gold is approximately 1×1015 g cm-3 and solid gold has a density of 19.3 g cm-3 estimate the percentage of the volume of solid gold that is "occupied" by the nucleus?

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Two elements X and Y combine to form two compounds with the following compositions Compound \% Mass X \% Mass Y 1 22.56 77.44 2 14.87 85.13 If compound 1 has the formula XY₃ then a possible formula for compound 2 is

In the presence of a catalyst carbon monoxide (CO) will reaction with oxygen (O₂) to form carbon dioxide (CO₂). How many liters of carbon dioxide can be formed from 1.5 L of carbon monoxide (with excess oxygen) if all the gases are held at the same temperature and pressure?

A 20.0 g a sample is composed of a mixture of Fe₂O₃ and Fe₃O₄. The mixture is found to contain 14.45 g of iron. What percent of the sample is Fe₂O₃?

Naturally occurring silicon is composed of three isotopes: ²⁸Si (atomic mass 27.98), ²⁹Si (atomic mass 28.98), and ³⁰Si (atomic mass 29.97). The atomic mass of the naturally occurring isotope mixture is 28.0855. The relative percentages of ²⁸Si, ²⁹Si, and ³⁰Si are

Chlorine has two naturally occurring isotopes ³⁵Cl (atomic mass 34.97) and ³⁷Cl (atomic mass of 36.96). If ions of naturally occurring Cl₂ are detected in a mass spectrometer how many peaks should be observed?

If the density of the nucleus of gold is approximately 1×10¹⁵ g cm^-³ and solid gold has a density of 19.3 g cm^-³ estimate the percentage of the volume of solid gold that is "occupied" by the nucleus?