Chemistry moles - Study guides, Class notes & Summaries
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Chemistry Chapter 9: Stoichiometry Questions and Answers Solved 100% Correct!!
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Stoichiometry is the branch of chemistry that deals with elements in compounds and with reactants and 
products in chemical reactions focusing on - Mass relationships 
Reaction stoichiometry is based on chemical equations and - The law of conservation of mass 
The number of significant figures in an answer to a stoichiometry problem is determined only by - 
The number of significant figures of any measured quantities in the problem 
The chemical equation P₄O₁₀ + 6H₂O 4H₃PO₄ can be in...
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Test Bank For Chemical Principles 8th Edition Zumdahl
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Chapter 03 - Stoichiometry 
1. Bromine exists naturally as a mixture of bromine-79 and bromine-81 isotopes. An atom of bromine-79 contains 
a. 79 protons, 79 electrons, and 35 neutrons. b. 35 protons, 44 neutrons, and 35 electrons. c. 44 protons, 44 electrons, and 35 neutrons. d. 34 protons and 35 electrons only. 
e. 35 protons, 79 neutrons, and 35 electrons. 
ANSWER: POINTS: DIFFICULTY: TOPICS: KEYWORDS: 
b 
1 
easy 
3.1 
atomic theory of matter | early atomic theory | general chemistry | isoto...
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LUOA chemistry semester exam review 2024 with complete solution
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LUOA chemistry semester exam review 2024 with complete solution 
 
How many molecules are in 3.9 moles of water? 
2.3 x 10^24 molecules of water 
How many moles are in 3.75 x 10^24 molecules of CO2? 
6.23 moles 
How many moles are in 1.16 x 10^25 atoms of H2CO3? 
19.3 moles of H2CO3 
The molar mass of Cu(OH)2 is _________ grams per mole. 
 
(Hint: Answers might vary slightly, but should still fall within an acceptable range for the correct answer) 
97.55 
How many moles are in 132.3 grams of car...
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CHEM 120 Week 3 Virtual Lab; Solution Preparation Part I, Part II
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Learning Objectives: 
•	Explain the relationship between mass, molecular weight, and numbers of atoms or molecules and perform calculations deriving these quantities from one another 
•	Perform mass-to-mass stoichiometric calculations via conversions to moles 
•	Identify the limiting and excess reagents in a chemical reaction 
•	Calculate the theoretical, actual and percent reaction yield 
•	Define Avogadro’s number and describe the mole quantification of matter 
•	Explain relation...
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SAMPLE CHEMISTRY PLACEMENT EXAM QUESTIONS WITH COMPLETE SOLUTIONS 100% 2023/2024
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SAMPLE CHEMISTRY PLACEMENT EXAM QUESTIONS WITH COMPLETE SOLUTIONS 100% 2023/2024 
Answer: Oxygen 
Aluminum forms a +3 ion. In order for the formula unit Al₂X₃ to be electrically neutral, the element X must form a -2 ion. Nonmetals in the oxygen column do this. Of these elements, only oxygen is a diatomic gas. 
Aluminum reacts with element X to form a compound with the formula A₂X₃. Element X exists as diatomic molecules, X₂, in the gaseous state at normal temperature and pressure. Elem...
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HESI A2 CHEMISTRY-CHRISJAY FILES (1) (1)
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HESI A2 ENTRANCEEXAM 
FOR 
CHAMBERLAINCOLLGE 
OF NURSING 
2023 QUESTIONS WITH 
ANSWERS 
CHEMISTRY 
HESI A2 CHEMISTRY V1/V2 FILE 
1. If a Hydrogen isin a compound, what would its oxidation number be? 
+1 
2. What isthe oxidation number of any simple ion? 
+1 or -1 depending on the charge of the ion 
3. How many kilograms are in a pound? 
0. kg 
4. What is the temperature for freezing point of water in Celsius? 
0 degrees Celsius (32°F for Fahrenheit) 
5. What is the conversion of Celsius to Fah...
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ACS Physical Chemistry Thermochemistry Study Guide |100% Correct|
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ACS Physical Chemistry 
Thermochemistry Study Guide |100% 
Correct| 
What is the third law of thermodynamics? *Ans* The entropy of a perfect crystal is zero. 
What is the second law of thermodynamics? *Ans* As a whole, the universe always tends 
towards increasing entropy. 
What is the relationship between number of microstates and entropy? *Ans* More 
microstates = higher entropy 
What is the relationship between temperature and entropy? *Ans* Temperature 
increases, entropy increases (dir...
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IB Chemistry Topic 5 Latest Update Graded A+
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IB Chemistry Topic 5 Latest Update 
 
Graded A+ 
 
Enthalpy The amount of heat released (exothermic) or absorbed (endothermic) during a 
chemical reaction (the energy needed for the reaction to occur) 
This can be lowered with the presence of a catalyst. 
 
Change in Enthalpy Hproducts -Hreactants 
 
Specific heat equation c= q in Joules (or Change in H)/mass(g)(change in temp) 
 
Specific heat of water 4.18 J/gdegreesC 
**NOTE: Usually in kJ 
 
Endothermic v. Exothermic Endothermic: Absorbing e...
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MCAT General Chemistry Practice Questions | Latest Update | 2024/2025 | Already Passed
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MCAT General Chemistry Practice 
Questions | Latest Update | 2024/2025 | 
 
Already Passed 
 
What is the oxidation state of sulfur in sulfur dioxide (SO2)? 
 
+4 
 
-2 
+6 
0 
 
Which of the following compounds has the highest boiling point? 
 
H2O 
 
CH4 
CO2 
 
N2 
 
In which type of reaction does a single element replace another element in a compound? 
 
2 
 
Single displacement 
Double displacement 
Combustion 
Synthesis 
 
What is the molarity of a solution that contains 2 moles of solute ...
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ACS Physical Chemistry Thermochemistry Study Guide |Question and Answer| 100% Correct
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ACS Physical Chemistry 
Thermochemistry Study Guide |Question 
and Answer| 100% Correct 
What is the third law of thermodynamics? *Ans* The entropy of a perfect crystal is zero. 
What is the second law of thermodynamics? *Ans* As a whole, the universe always tends 
towards increasing entropy. 
What is the relationship between number of microstates and entropy? *Ans* More 
microstates = higher entropy 
What is the relationship between temperature and entropy? *Ans* Temperature 
increases, en...
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