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WorksheetsAP Chemistry Unit 1- Atomic Structures & Properties
Total questions: 25
Worksheet time: 2hrs 5mins
What numerical expression gives the number of moles in 8.5g of H₂O?
8.5g×18g1 mol
18g×8.5g1 mol
8.5g×1 mol18g
18g×1 mol8.5g
The mass spectrum represented above is most consistent with which of the following elements?
Os
W
Re
Ta
Ca2+(aq) + CO32-(aq) → CaCO3(s)
A student obtains a 10.0g sample of a white powder labeled as CaCl2. After completely dissolving the powder in 50.0mL of distilled water, the student adds excess Na2CO3(s), which causes a precipitate of CaCO3(s) to form, as represented by the equation above. The student filters the CaCO3(s), rinses it, and dries it until its mass is constant. Which of the following scientific questions could best be answered based on the results of the experiment?
Is the Na2CO3(s) used in the experiment pure?
Is the CaCl2(s) used in the experiment pure?
What is the molar solubility of CaCl2 in water?
What is the molar solubility of CaCO3 in water?
A jar labeled KF contains a powder. The table above contains information determined by analyzing a sample of the powder in the laboratory. What information in the table is the most helpful in determining whether the powder is pure KF?
Mass
Mass Percent of K
Density
Color
Which of the following is the correct electron configuration for a ground-state atom of Sulfur?
3p4
1s22s22p63p43s2
1s22s23s23p4
1s22s22p63s23p4
Which peak represents the 2s subshell?
X
Y
Z
The atomic radii of the elements in the oxygen group in the periodic table are given in the table above. Which of the following best helps explain the trend of increasing atomic radius from O to Po?
The number of particles in the nucleus of the atom increases.
The number of electrons in the outermost shell of the atom increases.
The attractive force between the valence electrons and the nuclei of the atoms decreases.
The repulsive force between the valence electrons and the electrons in the inner shells decreases.
Na reacts with Cl in a mole ratio of 1 to 1, forming the ionic compound NaCl. Which of the following elements will react with Cl in a mole ratio of 1 to 1, forming an ionic compound, and why?
S, because it is in the same period as Cl.
Mg, because the atomic mass of Mg is similar to that of Na.
K, because it is in the same period as Na.
K, because it is in the same group as Na.
A 1.0 mol sample of which of the following compounds has the greatest mass?
CO
H2O
AgCl
NO2
The mass spectrum represented above is most consistent with which of the following elements?
Zr
Ti
Y
Mo
What is the electron configuration for Cu+?
1s22s22p63s23p64s24d9
1s22s22p63s23p64s23d9
1s22s22p63s23p64s23d8
1s22s22p63s23p64s13d9
Using only the periodic table arrange the following elements in order of increasing ionization energy:
K, Br, Se, Ni
K, Ni, Se, Br
Br, Se, Ni, K
Ni, Se, K, Br
Se, Br, K, Ni
What is the valence electron configuration for the oxygen atom?
1s22s22p4
2s22p4
2p4
2s22p5
What is the molar mass of C6H6?
84g/mol
74g/mol
78g/mol
76g/mol
What is the percent composition of nitrogen in ammonia (NH3)?
82%
93%
18%
78%
What is the empirical formula of a hydrocarbon that contains 92.71% C and 7.29% H?
CH2
C2H2
C3H
CH
How many total electrons does the element represented by the diagram above?
14
15
5
16
Which of the following lists elements in order from increasing atomic size.
F, O, C, N
F, Cl, Br, I
K, Na, Li, H
Mn, Fe, Co, Ni
How many atoms are in 1.67 moles of oxygen gas?
1.01x1024 atoms O2
2.77x10-24 atoms O2
53.44 atoms O2
5.22x10-2 atoms O2
The molar mass of a compound with an empirical formula of CH2O is 121.51g/mol. What is the molecular formula of the compound?
C4H4O4
C13H26O13
CH2O
C4H8O4
What charge does Na typically have in ionic compounds, and why?
-1, because it has one valence electron.
+1, because it has one valence electron.
+3, because it is located in period three.
+4, because it has four occupied subshells.
How many moles are in 3.1g of Al2O3?
.0299 mol
495.07 mol
.0176 mol
.0194 mol
How is effective nuclear charge calculated?
Protons - valence electrons
Protons - core electrons
Protons + valence electrons
Protons + core electrons
Which of the following is true according to Coulomb's law?
Protons repel protons
Electron's attract electrons
Protons attract electrons
Electrons repel electrons
Which of the following is true regarding electronegativity?
Increases going left to right
Increases going right to left
Increases going down a group
Increases going up a group
