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Unformatted text preview: 2 Question Status CZHWIP
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(Answered Started: September 14, 2010 4:34 PM
Submitted: September 14, 2010 4:49 PM Time spent: oo:14:59 1 2 Q 1
Total score: 12/12=100% ( J I 'l
E I Q 2
J / ./ J
Taken by itself, the fact that 8.0 g of oxygen and 1.0 g of hydrogen combine to give 90 g of water demonstrates what natural law?
Student Response Value Correct Answer Feedback
A. Conservation of Mass 100% E
B. Constant Composition
C. Multiple proportions
D. The Atomic Theory
Score: 1/1 H is the symbol for hydrogen and Cl is the symbol for chlorine. Enter the name of the element with the symbol Mn. Student Response Value Correct Answer
1. Manganese 100% Equals manganese (100%) Score: 1/1 An Iml’VSS nucleus contains Student Response Value Correct Answer Feedback A. 56 protons and 26
neutrons. B. 30 protons and 26
neutrons. C. 26 protons and 26
neutrons. D. 56 protons and 56
neutrons. .-'.i E. 26 protons and 30 100% Q _
neutrons. Score: 1/1 which of these best describes the set of elements below? lead (Db), vanadium, sulfur Student Response Value Correct Answer Feedback A. transition metal, non-
metal, metalloid B. main group metal, 100% M
transiton metal, none
metal C. metalloid, halogen,
noble gas D. non-metal, metalloid,
halogen E. alkali metal, non-
metal, transition metal Score: 1/1 The hypothetical metal Q with atomic mass of 68.33 has two isotopes, 57Q (isotopic mass 66.945 amu) and EQQ (isotopic mass 68.958 amu). Calculate the abundance of 57Q in %. Student Response Value Correct Answer Feedback
3 1.2% 100% a
77.8% 71.0.“??? 22.2% Score: 1/1 If 200.0 g of magnesium oxide contains 120.6 g of magnesium, what mass of oxygen in g is contained in 6.159 kg of magnesium oxide? Do not write units with your answer. Student Response Value Correct Answer
Answer: 2445 100% 2,445 Score: 1/1 Elements in Group SA (16) on the periodic table are most likely to form With a charge of Student Response Value Correct Answer Feedback anions, 2- 100% 5 Correct: These atoms often gain two electrons, forming the 2- ion.
cations, 2+ cations, 2- W909“? cations, 6+ Score: 1/1 How many Mo atoms are present in 6 formulas of the compound, molybdenum(IV) phosphate? Enter only the number please. Student Response Value Correct Answer
Answer: 16 100% 13 t. I" n. l”! Score: 1/1 thch name is \ncorrect? Student naponse Value Correct Answer
A. EEr3 boron tnbromlde Feedback E. C02 carbon dioxwde 5i C. N325 disudmm sulﬁde 100% a D. PCI5 phosphorus
pentachlonde E. KCI potassium chlonde Score: 1/1 10.
thch formula could not be that of a straight-chain a1kane? Student Expense Value Correct Answer
A. CH4 a. c3143 c. CgHm 100% a D. Cngg E. cur-I72 Score: 1/1 11.
J.J. Thomson Student Expense Value Correct Answer A. discovered the
nuc‘eus. B. measured the charge
of the e1ectron. C. discovered X-Rays. . measured the 100% a
charge/mass ratio of
the electron. Correct: Thompson \n fact dwscovered the electron. E. invented the cathode
ray tube. Score: 1/1 12.
What 15 the formu‘a wewght In arm for Fe4[Fe(CN)6]3? Student [espouse Value uni-act Answer
535 .91 Feedback . 359.31 100% a Correct: 435.37 491.22 WPPm?’ 747.51 Score: 1/1 Done ...
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This note was uploaded on 03/30/2011 for the course CHEM 1331 taught by Professor Bott during the Fall '08 term at University of Houston.
- Fall '08