Question 1

Radon has seventeen isotopes ranging from 210Rd to 226Rd. What do all of these isotopes have in common?

Accepted Answer

A)  the same number of electrons 
B)  the same number of protons 
C)  the same number of neutrons 
D)  a and b 
E)  b and c 
A)  the same number of electrons 
B)  the same number of protons 
C)  the same number of neutrons 
D)  a and b 
E)  b and c

Question 2

A sample of carotene is extracted from a carrot and found to contain 17.9 g of carbon and 2.1 g of hydrogen. A second carotene sample is synthesized in the lab and found to contain 10.0 g of carbon. How many grams of hydrogen are in the second sample?

Accepted Answer

A)  0.021 g 
B)  0.940 g 
C)  1.17 g 
D)  2.00 g 
E)  3.76 g 
A)  0.021 g 
B)  0.940 g 
C)  1.17 g 
D)  2.00 g 
E)  3.76 g

Question 3

You are trying to use percent mass of hydrogen to determine if a compound is epinephrine (C9H13NO3) or nor-epinephrine (C8H11NO3). What is the maximum error that is acceptable for your instrument in order to distinguish between these two compounds?

Accepted Answer

A)  °0.5% 
B)  °1% 
C)  °2% 
D)  °5% 
E)  °10% 
A)  °0.5% 
B)  °1% 
C)  °2% 
D)  °5% 
E)  °10%

Question 4

Which has the greatest number of neutrons?

Accepted Answer

A)  238U 
B)  237Np 
C)  239Pu 
D)  240Am 
E)  240Cm 
A)  238U 
B)  237Np 
C)  239Pu 
D)  240Am 
E)  240Cm

Question 5

Air is best classified as

Accepted Answer

A)  an element 
B)  a compound 
C)  a homogeneous mixture 
D)  a heterogeneous mixture 
A)  an element 
B)  a compound 
C)  a homogeneous mixture 
D)  a heterogeneous mixture

Question 6

10.3 g of an unknown compound is sealed in a tube with 25.8 g of hydrochloric acid. The tube is heated the compound completely dissolves. What is the mass of the contents of the tube after the reaction?

Accepted Answer

A)  exactly 36.1 g 
B)  slightly more than 35.8 g 
C)  slightly less than 35.8 g 
D)  exactly 10 g 
E)  there is no way to know without more information about the reaction 
A)  exactly 36.1 g 
B)  slightly more than 35.8 g 
C)  slightly less than 35.8 g 
D)  exactly 10 g 
E)  there is no way to know without more information about the reaction

Question 7

Which statement best describes N2

Accepted Answer

A)  it is an element 
B)  it is a compound 
C)  it is a homogeneous mixture 
D)  it is a heterogeneous mixture 
E)  both a & b 
A)  it is an element 
B)  it is a compound 
C)  it is a homogeneous mixture 
D)  it is a heterogeneous mixture 
E)  both a & b

Question 8

A marble tabletop is best classified as

Accepted Answer

A)  an element 
B)  a compound 
C)  a homogeneous mixture 
D)  a heterogeneous mixture 
A)  an element 
B)  a compound 
C)  a homogeneous mixture 
D)  a heterogeneous mixture

Question 9

Which has the same number of neutrons as protons?

Accepted Answer

A)  1H 
B)  19F 
C)  32S 
D)  40Ar 
E)  80Se 
A)  1H 
B)  19F 
C)  32S 
D)  40Ar 
E)  80Se

Question 10

A red solid is heated in an evacuated container until it completely vaporizes. When the vapor cools, it is found to be a sliver liquid. The mass of the silver liquid is less than that of the original solid. The red solid is best classified as

Accepted Answer

A)  an element 
B)  a compound 
C)  a homogeneous mixture 
D)  a heterogeneous mixture 
A)  an element 
B)  a compound 
C)  a homogeneous mixture 
D)  a heterogeneous mixture

Question 11

How many neutrons are in a nucleus of a 235U atom?

Accepted Answer

A)  51 
B)  92 
C)  143 
D)  194 
E)  235 
A)  51 
B)  92 
C)  143 
D)  194 
E)  235

Question 12

The element antinomy has two naturally occurring isotopes. The natural abundances and isotopic masses are

$\begin{array}{|l|l|l|}
\hline \text { Isotope } & \% \text { Abundance } & \text { Isotopic Mass } \
\hline & & \
\hline { }^{121} \mathrm{Sb}& 57.21& 120.904 \
\hline { }^{123} \mathrm{Sb}& 42.79 & 120.904 \
\hline
\end{array}$
 
The atomic mass of naturally occurring antinomy is

Accepted Answer

A)  121.760 
B)  121.904 
C)  122.048 
D)  122.904 
E)  124.048 
A)  121.760 
B)  121.904 
C)  122.048 
D)  122.904 
E)  124.048

Question 13

Methane gas (CH4) reacts with oxygen (O2) to produce water vapor and carbon dioxide. What volume of water (H2O) and carbon dioxide (CO2) will be formed from the complete reaction of 3 L of methane with oxygen if all the gases are held at the same temperature and pressure?

Accepted Answer

A)  3 L of H2O and 3 L of CO2 
B)  6 L of H2O and 3 L of CO2 
C)  3 L of H2O and 6 L of CO2 
D)  6 L of H2O and 6 L of CO2 
E)  3 L of H2O and 1.5 L of CO2 
A)  3 L of H2O and 3 L of CO2 
B)  6 L of H2O and 3 L of CO2 
C)  3 L of H2O and 6 L of CO2 
D)  6 L of H2O and 6 L of CO2 
E)  3 L of H2O and 1.5 L of CO2

Radon has seventeen isotopes ranging from ²¹⁰Rd to ²²⁶Rd. What do all of these isotopes have in common?

A sample of carotene is extracted from a carrot and found to contain 17.9 g of carbon and 2.1 g of hydrogen. A second carotene sample is synthesized in the lab and found to contain 10.0 g of carbon. How many grams of hydrogen are in the second sample?

You are trying to use percent mass of hydrogen to determine if a compound is epinephrine (C₉H₁₃NO₃) or nor-epinephrine (C₈H₁₁NO₃). What is the maximum error that is acceptable for your instrument in order to distinguish between these two compounds?

Which has the greatest number of neutrons?

Air is best classified as

10.3 g of an unknown compound is sealed in a tube with 25.8 g of hydrochloric acid. The tube is heated the compound completely dissolves. What is the mass of the contents of the tube after the reaction?

Which statement best describes N₂

A marble tabletop is best classified as

Which has the same number of neutrons as protons?

A red solid is heated in an evacuated container until it completely vaporizes. When the vapor cools, it is found to be a sliver liquid. The mass of the silver liquid is less than that of the original solid. The red solid is best classified as

How many neutrons are in a nucleus of a ²³⁵U atom?

The element antinomy has two naturally occurring isotopes. The natural abundances and isotopic masses are Isotope \% Abundance Isotopic Mass 57.21 120.904 42.79 120.904 The atomic mass of naturally occurring antinomy is

Methane gas (CH₄) reacts with oxygen (O₂) to produce water vapor and carbon dioxide. What volume of water (H₂O) and carbon dioxide (CO₂) will be formed from the complete reaction of 3 L of methane with oxygen if all the gases are held at the same temperature and pressure?

Chemical Formulas, Equations, and Reaction Yields

Chemical Bonding: the Classical Description

Introduction to Quantum Mechanics

Quantum Mechanics and Atomic Structure

Quantum Mechanics and Molecular Structure

Bonding in Organic Molecules

Binding in Transition Metal Compounds and Coordination Complexes

The Gaseous State

Solids, Liquids, and Phase Transitions

Solutions

Thermodynamic Processes and Thermochemistry

Spontaneous Processes and Thermodynamic Equilibrium

Chemical Equilibrium

Acid-Base Equilibria

Solubility and Precipitation Equilibria

Electrochemistry

Chemical Kinetics

Nuclear Chemistry

Molecular Spectroscopy and Photochemistry

Structure and Bonding in Solids

Inorganic Materials

Polymeric Materials and Soft Condensed Matter

Filters

Exam 1: The Atom in Modern Chemistry

Radon has seventeen isotopes ranging from 210Rd to 226Rd. What do all of these isotopes have in common?

A sample of carotene is extracted from a carrot and found to contain 17.9 g of carbon and 2.1 g of hydrogen. A second carotene sample is synthesized in the lab and found to contain 10.0 g of carbon. How many grams of hydrogen are in the second sample?

You are trying to use percent mass of hydrogen to determine if a compound is epinephrine (C9H13NO3) or nor-epinephrine (C8H11NO3). What is the maximum error that is acceptable for your instrument in order to distinguish between these two compounds?

Which has the greatest number of neutrons?

Air is best classified as

10.3 g of an unknown compound is sealed in a tube with 25.8 g of hydrochloric acid. The tube is heated the compound completely dissolves. What is the mass of the contents of the tube after the reaction?

Which statement best describes N2

A marble tabletop is best classified as

Which has the same number of neutrons as protons?

A red solid is heated in an evacuated container until it completely vaporizes. When the vapor cools, it is found to be a sliver liquid. The mass of the silver liquid is less than that of the original solid. The red solid is best classified as

How many neutrons are in a nucleus of a 235U atom?

The element antinomy has two naturally occurring isotopes. The natural abundances and isotopic masses are Isotope \% Abundance Isotopic Mass 57.21 120.904 42.79 120.904 The atomic mass of naturally occurring antinomy is

Methane gas (CH4) reacts with oxygen (O2) to produce water vapor and carbon dioxide. What volume of water (H2O) and carbon dioxide (CO2) will be formed from the complete reaction of 3 L of methane with oxygen if all the gases are held at the same temperature and pressure?

Chemical Formulas, Equations, and Reaction Yields

Chemical Bonding: the Classical Description

Introduction to Quantum Mechanics

Quantum Mechanics and Atomic Structure

Quantum Mechanics and Molecular Structure

Bonding in Organic Molecules

Binding in Transition Metal Compounds and Coordination Complexes

The Gaseous State

Solids, Liquids, and Phase Transitions

Solutions

Thermodynamic Processes and Thermochemistry

Spontaneous Processes and Thermodynamic Equilibrium

Chemical Equilibrium

Acid-Base Equilibria

Solubility and Precipitation Equilibria

Electrochemistry

Chemical Kinetics

Nuclear Chemistry

Molecular Spectroscopy and Photochemistry

Structure and Bonding in Solids

Inorganic Materials

Polymeric Materials and Soft Condensed Matter

Filters

Radon has seventeen isotopes ranging from ²¹⁰Rd to ²²⁶Rd. What do all of these isotopes have in common?

You are trying to use percent mass of hydrogen to determine if a compound is epinephrine (C₉H₁₃NO₃) or nor-epinephrine (C₈H₁₁NO₃). What is the maximum error that is acceptable for your instrument in order to distinguish between these two compounds?

Which statement best describes N₂

How many neutrons are in a nucleus of a ²³⁵U atom?

Methane gas (CH₄) reacts with oxygen (O₂) to produce water vapor and carbon dioxide. What volume of water (H₂O) and carbon dioxide (CO₂) will be formed from the complete reaction of 3 L of methane with oxygen if all the gases are held at the same temperature and pressure?