Sat Chemistry Practice Questions

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Structure of Matter
| |
1.| An element consists of three isotopes in the relative abundance given below. What is the atomic mass of this element?| | 30.00% = 40.00 amu50.00% = 41.00 amu20.00% = 42.00 amu| | (A)| 40.90|

| (B)| 41.00|
| (C)| 41.90|
| (D)| 42.20|
| (E)| 42.90|
| |
2.| The total number of electrons that can be accommodated in the fourth principal energy level is _____| | (A)| 2|
| (B)| 8|
| (C)| 18|
| (D)| 32|
| (E)| 50|
| |
3.| If the set of quantum numbers n = 3, l = 1, ml = 0, ms = ±1/2 represents the last electron to be added to complete the ground state electron configuration of an element, which one of the following could be the symbol for the element?| | (A)| Na|

| (B)| Si|
| (C)| Th|
| (D)| V|
| (E)| Zn|
| |
4.| Which element has the following electron configuration?| | 1s22s22p63s23p64s23d4|
| (A)| Cr|
| (B)| Mn|
| (C)| Mo|
| (D)| S|
| (E)| Se|
| |
5.| Complete the balanced equation below. The missing term is| | |
| (A)| |
| (B)| |
| (C)| |
| (D)| |
| (E)| |
|

| |
6.| Oxygen-15 has a half-life of 9.98 minutes. How much of a 20.0 g sample of oxygen-15 remains after 60.0 minutes?| | (A)| 0.156 g|
| (B)| 0.312 g|
| (C)| 0.625 g|
| (D)| 1.25 g|
| (E)| 2.50 g|
| |
7.| Which of the following atoms would have the largest second ionization energy?| | (A)| Mg|
| (B)| Cl|
| (C)| S|
| (D)| Ca|
| (E)| Na|
|

| Statement I| | Statement II|
8.| Hydrogen has a lower ionization energy than does helium.|   BECAUSE  | Hydrogen bonds with halogens to form polar covalent bonds.|

| |
9.| Order the elements S, Cl, and F in terms of increasing atomic radii.| | (A)| S, Cl, F|
| (B)| Cl, F, S|
| (C)| F, S, Cl|
| (D)| F, Cl, S|
| (E)| S, F, Cl|
|

| Statement I| | Statement II|
10.| The second ionization energy of B is higher than that of Be.|   BECAUSE  | The second electron to be removed from B and Be comes from the same principal energy level.| 11.| Oxygen has a smaller first ionization energy than fluorine.|   BECAUSE  | Oxygen has a higher Zeff value than does fluorine.|

| |
12.| Removing an electron from sodium is an _____ process and removing an electron from fluorine is an _____ process.| | (A)| Endothermic, exothermic|
| (B)| Exothermic, endothermic|
| (C)| Endothermic, endothermic|
| (D)| Exothermic, exothermic|
| (E)| More information is needed|
|

| |
13.| Which numbered response lists all the molecules below that exhibit resonance and none that do not?| |   I. AsF5 
 II. HNO3
III. SO2|
| (A)| I only|
| (B)| II only|
| (C)| II and III|
| (D)| III and IV|
| (E)| I, II, and III|
| |
14.| The sulfur hexafluoride molecule is nonpolar and contains no lone (unshared) electron pairs on the sulfur atom. Which answer choice lists all of the bond angles contained in sulfur hexafluoride?| | (A)| 120º|

| (B)| 180º|
| (C)| 90º and 180º|
| (D)| 90º, 120º, and 180º|
| (E)| 109.5º|
|

| Statement I| | Statement II|
15.| Molecules that contain a polar bond are not necessarily polar compounds.|   BECAUSE  | If polar bonds in a molecule are symmetrically arranged, then their polarities will cancel and they will be nonpolar.| 16.| The NH3 molecule is more polar than the NF3 molecule.|   BECAUSE  | Fluorine atoms are larger than hydrogen atoms.|

| |
17.| Which one of the following molecules is octahedral?| | (A)| BeCl2|
| (B)| SeF6|
| (C)| BF3|
| (D)| PF5|
| (E)| CF4|
| |
18.| Which molecule is incorrectly matched with the molecular geometry?| | Molecule| Molecular geometry|
| (A)| SF6| octahedral|
| (B)| CH4| tetrahedral|
| (C)| SO3...
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