CHEMISTRY CHAPTER 2
Exercise 2.50: Problems by Topic – Atomic Theory, Nuclear Theory, and Subatomic Particles
Which of the following statements about subatomic particles are false?
Part A
Protons and electrons have charges of the same magnitude but opposite sign.
[removed]True
[removed]False
Part B
Protons have about the same mass as neutrons.
[removed]True
[removed]False
Part C
Some atoms don’t have any protons.
[removed]True
[removed]False
Part D
Protons and neutrons have charges of the same magnitude but opposite sign.
[removed]True
[removed]False
Exercise 2.58: Problems by Topic – Isotopes and Ions
Uranium-235 is used in nuclear fission.
Part A
Determine the number of protons and neutrons in uranium-235.
Enter your answers numerically separated by a comma.
N p , N n =
Part B
Write its symbol in the form AZ X .
Express your answer as an isotope.
Exercise 2.60: Problems by Topic – Isotopes and Ions
Determine the number of protons and electrons in each of the following.
Part A
Zn 2+
Enter your answers numerically separated by a comma.
N p , N e =
Part B
P 3−
Enter your answers numerically separated by a comma.
N p , N e =
Part C
Fe 3+
Enter your answers numerically separated by a comma.
N p , N e =
Part D
Sr 2+
Enter your answers numerically separated by a comma.
N p , N e =
Exercise 2.74: Problems by Topic – The Periodic Table and Atomic Mass
Silicon has three naturally occurring isotopes with the following masses and natural abundances:
Isotope
Mass (amu)
Abundance (%)
Si−28
27.9769
92.2
Si−29
28.9765
4.67
Si−30
29.9737
3.10
Part A
Calculate the atomic mass of silicon.
Atomic mass =
Exercise 2.79: Problems by Topic – The Mole Concept
Part A
How many sulfur atoms are there in 4.5 mol of sulfur?
Express your answer using two significant figures.
Exercise 2.81: Problems by Topic – The Mole Concept
What is the amount, in moles, of each of the following substances?
Part A
12.2 g Ar
Part B
3.75 g Zn
Part C
26.6 g Ta
Part D
0.219 g Li
Exercise 2.82: Problems by Topic – The Mole Concept
What is the mass, in grams, of each of the following?
Part A
2.3×10−3 mol Sb
Express your answer using two significant figures.
Part B
3.53×10−2 mol Ba
Express your answer using three significant figures.
Part C
43.6 mol Xe
Express your answer using three significant figures.
Part D
1.1 mol W
Express your answer using two significant figures.
Exercise 2.76: Problems by Topic – The Periodic Table and Atomic Mass
The atomic mass of copper is 63.546 amu
Part A
Do any copper isotopes have a mass of 63.546 amu ?
[removed]yes
[removed]no
Part B
Explain.
Exercise 2.36: Problems by Topic – The Laws of Conservation of Mass, Definite Proportions, and Multiple Proportions
Upon decomposition, one sample of magnesium fluoride produced 1.65 kg of magnesium and 2.57 kg of fluorine. A second sample produced 1.31 kg of magnesium.
Part A
How much fluorine (in grams) did the second sample produce?
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