General Chemistry Prep

Chemistry_Quiz_4.docx.docx-Question 1 1 / 1 pts The rigid

Question 1 1 / 1 pts A polar molecule must have   an unsymmetrical arrangement. Correct!   both polar bonds and an unsymmetrical arrangement.   polar bonds.   neither polar bonds nor an unsymmetrical arrangement.   Question 2 1 / 1 pts Which of the following covalent molecules contains polar bonds?   Correct!   more than one response is correct       Question 3 1 / 1 pts The correct name for BaCO 3  is _____ .   barium trioxide Correct!   barium carbonate   barium monocarbon trioxide   barium monocarbonate   Question 4 1 / 1 pts H 2 O is a binary compound.   False   Correct!   True   Question 5 1 / 1 pts Hydrogen bonds form between the molecules of the hypothetical compound ABCH and do not form between DEFH molecules.   There is no significant difference between ABCH and DEFH.   ABCH has a higher molecular weight than DEFH.   ABCH tends to be a compound with color, but DEFH does not have color. Correct!   ABCH represents a compound that contains O, N, or F directly bonded to H.   Question 6 1 / 1 pts Which of the following has the highest electronegativity?   N Correct!   O   Si   P   Question 7 1 / 1 pts Which of the following pairs of elements is most likely to form a covalent bond?   Cs Br Correct!   Cl O   Zn S   Fe H   Question 8 1 / 1 pts The shape of a BF 3  molecule is _____ .   tetrahedral Correct!   trigonal planar   angular   trigonal pyramid Question 9 1 / 1 pts Which of the following correctly illustrates hydrogen bonding in water?   Correct!         Question 10 1 / 1 pts The correct name for the covalent compound N 2 O 4  is _____ .   dinitrogen quartoxide Correct!   dinitrogen tetroxide   nitrogen oxide   nitrogen quartoxide   Question 11 1 / 1 pts The correct formula for ammonium sulfate is _____ .   NH 4 SO 4 Correct!   (NH 4 ) 2 SO 4   NH 4 (SO 4 ) 2   (NH 4 ) 2 (SO 4 ) 3   Question 12 1 / 1 pts NH 3  (ammonia) exhibits what type of structure?   none of these   pyramid with square base   triangle Correct!   pyramid with triangular base Question 13 1 / 1 pts HCl and HBr can exhibit hydrogen bonding with each other.   True   Correct!   False     Question 14 1 / 1 pts Identify the rule that states that atoms will gain or lose sufficient electrons to achieve an outer electron arrangement identical to that of a noble gas.   Duplet rule   Hund’s rule Correct!   Octet rule   Duplet rule   Question 15 1 / 1 pts In describing the strength of interparticle forces, we discover that the weakest forces of bonds are _____ .   metallic Correct!   dispersion   covalent   dipolar   Question 16 1 / 1 pts Na +  and F −  are isoelectronic. Correct!   True     False   Question 17 1 / 1 pts What is the formula mass of the compound formed between Al 3+  and Cl - ?   62.5 u

CHEM | 139 | General Chemistry Prep | assessment | Question 1 1 / 1 pts A polar m

Question 1 1 / 1 pts Suppose the speedometer in your car reads 55.0 mph. What is your speed in km/hr? (1 km = 0.621 mi.) 0.011 34.1 0.029 88.6 Question 2 1 / 1 pts If urine has a density of 1.08 g/mL, what would be the mass of a 125 mL urine sample? 125 g 135 g 116 g 0.00864 g Question 3 1 / 1 pts As two clear liquid solutions are thoroughly mixed, a red solid forms. This change is most likely _____ . both chemical and physical. neither chemical nor physical. physical. chemical. Question 4 1 / 1 pts Which of the following numbers is correctly expressed using scientific notation? 45.78 × 10 6 .0987 × 10 3 5.248 × 10 4 3489 Incorrect Question 5 0 / 1 pts Which of the following is a chemical property of matter? freezing point flammability density color Question 6 1 / 1 pts Early measurements of length were based on dimensions of the human body. dimensions of astronomical bodies. distances between cities. dimensions of bodies of water. Question 7 1 / 1 pts Which of the following represents a physical change in matter? A substance produces a gas and a solid when heated. A substance solidifies at 443 K. A substance burns when heated. A substance changes color when exposed to air. Question 8 1 / 1 pts If a student completes 5 problems out of a total of 8 on a pop quiz, what percentage of the quiz was completed? 0.625 62.5 16.0 6.25 Question 9 1 / 1 pts Which of the following is an SI unit? meter calorie liter gram Question 10 1 / 1 pts You are saving for a new $1226 (including taxes) laptop computer using earnings from your part-time job.  At that job, you work 20 hours/week, earning $10.25/hour take home pay.  If you can save 25% of all of your income, how many weeks will it take for you to save enough money? 12 weeks 24 weeks 48 weeks 6 weeks Question 11 1 / 1 pts The fact that gold does not corrode is a ______ property personal real chemical physical Question 12 1 / 1 pts Ethanol (ethyl alcohol) has a density of 0.789 g/mL at 25°C.   If 75.5 g of ethanol is needed for a reaction, what volume in mL should be added to the reaction container? 0.0105 mL 59.6 mL 95.7 mL 78.9 mL Question 13 1 / 1 pts Which of the following properties is characteristic of a mixture? fixed melting point. cannot be physically separated into simpler materials variation of physical properties constant composition Question 14 1 / 1 pts The fact that iron (Fe) corrodes when exposed to water and air is a metal property. physical property. real property. chemical property. Incorrect Question 15 0 / 1 pts Which of the following is a physical property of matter? produces a gas when placed in an acid it does not burn the surface turns black in air freezes at − 10 ° F Question 16 1 / 1 pts The basic unit of length in the metric system is the _____ . foot millimeter meter mil Incorrect Question 17 0 / 1 pts Which of the following consists of a single chemical species?

CHEM | 139 | General Chemistry Prep | assessment | Question 1 1 / 1 pts Suppose t

Chemistry Quiz 3 Question 1 1 / 1 pts Hydrogen is a noble gas.   True     False     Question 2 1 / 1 pts The element chlorine is found in the same group of the periodic table as _____ .   Br   all of these   F   I Question 3 1 / 1 pts The family name for group VIIIA(18) of the periodic table is   representative elements.   transition metals.   There is no family name   noble gases.   Question 4 1 / 1 pts Which of the following statements conforms to the trends within the Periodic Table of the Elements?   Elements become more likely to be darkly colored at the bottom of a group.   Elements become more likely to be gases at the bottom of a group.   Elements become more likely to be more brittle at the bottom of a group.   Elements become more likely to be a solid at the bottom of a group. Question 5 1 / 1 pts Which of the following elements should have properties similar to those of nitrogen (element 7)?   O   P   C   Si   Question 6 1 / 1 pts The fifth period begins with Rb.   False     True   Question 7 1 / 1 pts A bromine atom has a larger radius than a chlorine atom.   False     True     Question 8 1 / 1 pts Which of the following has the same number of outer shell electrons as sulfur, S?   F   O   C   N Question 9 1 / 1 pts All of the transition elements are metals.   False     True     Incorrect Question 10 0 / 1 pts An anion is smaller than the atom from which it is produced.   True     False   Question 11 1 / 1 pts Which of the following is considered a transition element?   tungsten   radon   cesium   holmium   Incorrect Question 12 0 / 1 pts Sodium, Na, and potassium, K, are in the same period.   False     True   Question 13 1 / 1 pts What is the basis for placing groups of elements into a family on the periodic table?   similar atomic mass numbers   similar colors, shapes and uses   similar valence electron configurations   identical chemical and physical properties   Incorrect Question 14 0 / 1 pts The atomic size of the elements in a group increases with the period number.   False     True   Question 15 1 / 1 pts Suppose an electron moved from the second shell to the third shell.   The move gave off energy.   Electrons can't move from shell to shell, but can move into the nucleus.   The move required an input of energy.   Electrons can move spontaneously from shell to shell.   Question 16 1 / 1 pts Which of the following is a representation of a  p  orbital?         Question 17 1 / 1 pts Which of the following is a reasonable explanation as to why atomic radii become smaller as one moves to the right for the representative elements in a period?   The charge of the nucleus increases, pulling the shells closer.   Atomic radii actually increase as you move to the right.   Elements become less metallic.   More densely packed shells are always smaller.   Question 18 1 / 1 pts For which of the listed elements (E) would the energy required for the following reaction be the least ?     E (g)   →   E + (g)  + e –   K   Na   Ca

CHEM | 139 | General Chemistry Prep | assessment | Chemistry Quiz 3 Question 1 1 

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