A 1.5 g tablet for pain might contain 0.30 g acetaminophen (C8H9NO2, 151.16 g/mol) and 0.044 g codeine (C18H21NO3, 299.36 g/mol).Calculate the number of moles of acetaminophen in the tablet.

A) 2.0 * 10-3 mol B) 1.5 *10-4 mol C) 9.9 *10-3 mol D) 2.9* 10-4 mol E) 1.1 *10-1 mol A) 2.0 * 10-3 mol B) 1.5 *10-4 mol C) 9.9 *10-3 mol D) 2.9* 10-4 mol E) 1.1 *10-1 mol

Rubidium has two naturally occurring isotopes, 85Rb (84.912 amu) and 87Rb (86.909 amu).Rubidium-85 is the more abundant isotope (72.17%).Calculate the average atomic mass of Rb.

A) 86.91 amu B) 85.47 amu C) 85.91 amu D) 86.35 amu E) 86.00 amu A) 86.91 amu B) 85.47 amu C) 85.91 amu D) 86.35 amu E) 86.00 amu

Iron can form two ionic compounds with sulfur, one containing Fe2+ and the other containing Fe3+.What is the difference in their formula unit masses?

A) 143.76 amu B) 119.97 amu C) 87.91 amu D) 55.85 amu E) 32.06 amu A) 143.76 amu B) 119.97 amu C) 87.91 amu D) 55.85 amu E) 32.06 amu

Exam 2: Atoms, Ions, and Molecules the Building Blocks of Matter

Explore all topics

A 1.5 g tablet for pain might contain 0.30 g acetaminophen (C₈H₉NO₂, 151.16 g/mol) and 0.044 g codeine (C₁₈H₂₁NO₃, 299.36 g/mol).Calculate the number of moles of acetaminophen in the tablet.

(Multiple Choice)

4.8/5

(37)

Question 101

Rubidium has two naturally occurring isotopes, ⁸⁵Rb (84.912 amu) and ⁸⁷Rb (86.909 amu).Rubidium-85 is the more abundant isotope (72.17%).Calculate the average atomic mass of Rb.

(Multiple Choice)

4.9/5

(31)

Question 102

Calculate the number of molecules in 0.25 mol of strychnine, C₂₁H₂₂N₂O₂.

(Multiple Choice)

4.7/5

(34)

Question 103

Write the complete atomic symbol with both a superscript and a subscript for the atom or ion that contains 11 protons, 10 electrons, and 12 neutrons.

(Short Answer)

4.9/5

(36)

Question 104

Which element forms ionic compounds with the formula XBr₃?

(Multiple Choice)

4.7/5

(42)

Question 105

What are cathode rays?

(Multiple Choice)

4.9/5

(29)

Question 106

Which of the following is an alkali metal?

(Multiple Choice)

4.9/5

(41)

Question 107

You create a superheavy atom with an atomic number of 120.To which category does it belong?

(Multiple Choice)

4.7/5

(35)

Question 108

One isotope makes up 97% of all calcium atoms.Which one?

(Multiple Choice)

4.8/5

(43)

Question 109

Who discovered electrons?

(Multiple Choice)

4.7/5

(33)

Question 110

In one sentence, describe the picture of the atom that emerged from the Geiger-Marsden experiment.

(Essay)

4.9/5

(36)

Question 111

How many hydrogen atoms are there in 473 g of water roughly 16 (fl oz)?

(Short Answer)

4.9/5

(38)

Question 112

What is the formula for the ionic compound formed when calcium and bromine combine?

(Multiple Choice)

5.0/5

(37)

Question 113

Which characteristic would you expect indium NOT to exhibit?

(Multiple Choice)

4.9/5

(38)

Question 114

Give the number of protons, neutrons, and electrons in the following atoms or ions: ${ }^{56} \mathrm{Fe},{ }^{32} \mathrm{~S}^{2-},{ }^{133} \mathrm{Cs}^{+}$ $, { }^{89} \mathbf{Y}^{3+},{ }^{31} \mathrm{P}^{3-}$

(Essay)

4.8/5

(36)

Question 115

Highly enriched weapons-grade uranium might consist of exactly 90% U-235 (235.044 amu), with the remainder being U-238 (238.051 amu).What is the average atomic mass of this sample of highly enriched uranium? Assume the percentages are exact.

(Multiple Choice)

4.7/5

(29)

Question 116

Iron can form two ionic compounds with sulfur, one containing Fe²⁺ and the other containing Fe³⁺.What is the difference in their formula unit masses?

(Multiple Choice)

4.9/5

(43)

Question 117

A baseball has a diameter of approximately 7.4 cm (2.9 in), whereas a carbon atom has a diameter of about 140 pm.How many times larger is the baseball than the carbon atom?

(Multiple Choice)

4.9/5

(30)

Question 118

What is the name of the halogen in period 5?

(Multiple Choice)

4.8/5

(32)

Question 119

Isotopes have _______.

(Multiple Choice)

4.8/5

(36)

Question 120

Showing 101 - 120 of 143

Exam 2: Atoms, Ions, and Molecules the Building Blocks of Matter

A 1.5 g tablet for pain might contain 0.30 g acetaminophen (C8H9NO2, 151.16 g/mol) and 0.044 g codeine (C18H21NO3, 299.36 g/mol).Calculate the number of moles of acetaminophen in the tablet.

Rubidium has two naturally occurring isotopes, 85Rb (84.912 amu) and 87Rb (86.909 amu).Rubidium-85 is the more abundant isotope (72.17%).Calculate the average atomic mass of Rb.

Calculate the number of molecules in 0.25 mol of strychnine, C21H22N2O2.

Write the complete atomic symbol with both a superscript and a subscript for the atom or ion that contains 11 protons, 10 electrons, and 12 neutrons.

Which element forms ionic compounds with the formula XBr3?

What are cathode rays?

Which of the following is an alkali metal?

You create a superheavy atom with an atomic number of 120.To which category does it belong?

One isotope makes up 97% of all calcium atoms.Which one?

Who discovered electrons?

In one sentence, describe the picture of the atom that emerged from the Geiger-Marsden experiment.

How many hydrogen atoms are there in 473 g of water roughly 16 (fl oz)?

What is the formula for the ionic compound formed when calcium and bromine combine?

Which characteristic would you expect indium NOT to exhibit?

Give the number of protons, neutrons, and electrons in the following atoms or ions: 56Fe,32 S2−,133Cs+ { }^{56} \mathrm{Fe},{ }^{32} \mathrm{~S}^{2-},{ }^{133} \mathrm{Cs}^{+} 56Fe,32 S2−,133Cs+,89Y3+,31P3−, { }^{89} \mathbf{Y}^{3+},{ }^{31} \mathrm{P}^{3-} ,89Y3+,31P3−

Highly enriched weapons-grade uranium might consist of exactly 90% U-235 (235.044 amu), with the remainder being U-238 (238.051 amu).What is the average atomic mass of this sample of highly enriched uranium? Assume the percentages are exact.

Iron can form two ionic compounds with sulfur, one containing Fe2+ and the other containing Fe3+.What is the difference in their formula unit masses?

A baseball has a diameter of approximately 7.4 cm (2.9 in), whereas a carbon atom has a diameter of about 140 pm.How many times larger is the baseball than the carbon atom?

What is the name of the halogen in period 5?

Isotopes have _______.

Matter and Energy an Atomic Perspective

Atomic Structure Explaining the Properties of Elements

Chemical Bonding Understanding Climate Change

Bonding Theories Explaining Molecular Geometry

Intermolecular Forces Attractions Between Particles

Stoichiometry Mass Relationships and Chemical Reactions

Aqueous Solutions Chemistry of the Hydrosphere

Thermochemistry Energy Changes in Chemical Reactions

Properties of Gases the Air We Breathe

Properties of Solutions Their Concentrations and Colligative Properties

Thermodynamics Why Chemical Reactions Happen

Chemical Kinetics Clearing the Air

Chemical Equilibrium Equal but Opposite Reaction Rates

Acid-Base Equilibria Proton Transfer in Biological Systems

Additional Aqueous Equilibria Chemistry and the Oceans

Electrochemistry the Quest for Clean Energy

The Solid State a Particulate View

Organic Chemistry Fuels, Pharmaceuticals, and Modern Materials

Biochemistry the Compounds of Life

Nuclear Chemistry the Risks and Benefits

The Main Group Elements Life and the Periodic Table

Transition Metals Biological and Medical Applications

Filters

A 1.5 g tablet for pain might contain 0.30 g acetaminophen (C₈H₉NO₂, 151.16 g/mol) and 0.044 g codeine (C₁₈H₂₁NO₃, 299.36 g/mol).Calculate the number of moles of acetaminophen in the tablet.

Rubidium has two naturally occurring isotopes, ⁸⁵Rb (84.912 amu) and ⁸⁷Rb (86.909 amu).Rubidium-85 is the more abundant isotope (72.17%).Calculate the average atomic mass of Rb.

Calculate the number of molecules in 0.25 mol of strychnine, C₂₁H₂₂N₂O₂.

Which element forms ionic compounds with the formula XBr₃?

Give the number of protons, neutrons, and electrons in the following atoms or ions: ${ }^{56} \mathrm{Fe},{ }^{32} \mathrm{~S}^{2-},{ }^{133} \mathrm{Cs}^{+}$ $, { }^{89} \mathbf{Y}^{3+},{ }^{31} \mathrm{P}^{3-}$

Iron can form two ionic compounds with sulfur, one containing Fe²⁺ and the other containing Fe³⁺.What is the difference in their formula unit masses?