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11 Nov 2019

How many miles of gold (autumn,Au) are there in an I got of pure gold weighing 0.250 kg? 1.00 mol Au = 6.022 x 10^23 atoms Au = 197.0 g Au

How many moles of gold (aurum, Au) are there in an ingot of pure gold weighing 0.250 kg? 1.00 mol Au = 6.022 x 1023 atoms Au = 197.0 g Au 0 a, 0.020 mol Ob. 0.791 mol O c. 1.27 mol d. 4.93 mol

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The equation Mg + HCl ï®MgCl2 + H2 can be balanced by _____.

A) Changing the coefficient of Mg to 2

B) Changing the coefficient of HCl to 2

C) Changing the coefficient of MgCl2 to 12 .

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In the reaction below, how many molecules of water can be made from 38 molecules of C6H12O6?

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In the chemical reaction H2SO4 + 2NaOH ï®Na2SO4 + 2H2O, the coefficient of sodium sulfate is _____.
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H2CO3 ï®CO2 + H2O is an example of which type of reaction?

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In the reaction H2 + F2 ï® 2 HF, which of the following is true?

A) H2 is reduced

B) H2 is the oxidizing agent

C) F2 is reduced

D) HF is called the reducing agent

E) HF is called the oxidizing agent

Page 1

Ascorbic acid (C6H8O6) acts as an antioxidant by being oxidized to _____. A) C6H8O6
B) C6H8O8
C) C4H9O7

D) C6H6O4 E) C6H6O6

During anaerobic metabolism pyruvic acid is converted to _____.

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D) acetic acid

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Reduction of CH3 = CH3 by hydrogen yields _____.

A) 2CH4

B) CH2 = CH2

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D) C2H6

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Which of the following is not considered to be a form of reduction?

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B) Gain of electrons

C) Loss of an oxygen ion

D) Gain of negative charge

E) Gain of a sodium ion

Consider the reaction:
Au(s) + 3HNO3(aq) + 4HCl(aq) ï® HAuCl4(aq) + 3NO2(g) + 3H2O(l), how many Au atoms will react with 996 molecules of HCl?
A) 1992
B) 996
C) 498
D) 249
E) 336

Page 2

Oxidation of CH3CHO gives _____. A) CH3COOH

B) C2H6
C) C2H5OH D) H2C=CO E) CH3OH

Three moles of (NH4)2Fe(SO4)2Â·6H2O contains _____ moles of H2O.

A) 3

B) 6

C) 9

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How many moles of hydrogen atoms are present in 27 grams of H2O?

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B) Approximately one and a half

C) Approximately two

D) Approximately two and a half

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Five
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What is the molar mass of MgCO3?

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Page 3

Consider the formation of ammonium chloride given by the equation:
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Page 4

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Page 5

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