A sample of helium Study guides, Class notes & Summaries
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PHSC 211 UPDATED Exam Questions and CORRECT Answers
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If 2,000 atoms of 206Pb are found in a mineral sample, the how many helium atoms were 
produced?16,000 
Mount Fuji and Mount St. Helens in the western United States are examples 
of__________Stratovolcanoes 
The color of a mineral's powder is known as_______streak 
Which of the following pairs does NOT go together?Phyllite, High-grade 
metamorphism 
Pumice and scoria are easily identifiable because of their_________ texturesVesicular 
The first minerals to crystallize as a magma cools tend t...
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ACS General Chemistry practice 147 Questions with Verified Answers,100%CORRECT
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ACS General Chemistry practice 147 Questions with Verified Answers 
 
Examples of Lewis-Acid based reactions - CORRECT ANSWER H+(aq) + OH-(aq) →← H2O(l), 
HCl(g) + NH3(g) → NH4Cl(s) 
H+(aq) + OH-(aq) →← H2O(l) 
 
According to the Lewis definition, an acid is a species - CORRECT ANSWER accepting a pair of electrons. 
 
All are potential Lewis bases except - CORRECT ANSWER CH4 
 
Which hydrated metal ion is most acidic under conditions of equal molar concentration in water? - CORRECT ANS...
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CHEM133 Week 7 Midterm Exam (Spring)
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1.	Question: Dry ice (carbon dioxide) changes from a solid to a gas at –78.5°C. What is this temperature in °F? 
2.	Question: The state of matter for an object that has both definite volume and definite shape is 
3.	Question: In 1828, the diameter of the U.S. dime was changed to approximately 18 mm. What is this diameter when expressed in nanometers? 
4.	Question: A piece of antimony with a mass of 17.41 g is submerged in 46.3 cm3 of water in a graduated cylinder. The water level increases t...
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EXAS WASTEWATER OPERATORS QUIZ WITH 100% CORRECT ANSWERS ALREADY GRADED A+
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In the activated sludge plants, the operator will experience problems. Some of the common Operational problems include - 
a. Sludge quality, Foaming, Improper operating techniques 
b. Sludge consistency, Mechanical failures, Microorganisms die off 
c. Odors, Foaming, Operators not understanding lab analysis or how to correct deficiencies 
d. Recycling pumps and lines are typically undersized causing septic sludge, foaming, Operator training & Understanding of the plant 
e. Both a & d 
a. Sludge ...
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CHEM 120 WEEK 8 Final Exam 2023 with correct answers Already graded A+
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CHEM 120 WEEK 8 Final Exam 2023 
with correct answers Already graded 
A+ 
molarity = moles solute / liters solution 
0.25 M = moles NaOH / 0.035 L 
moles NaOH = 0.00875 moles NaOH 
1. (TCO 8) 35.0 mL of 0.25 M NaOH is neutralized by 23.6 mL of an HCl solution. The molarity of 
the HCl solution is (show your work): (Points : 5) 
2. (TCO 1) How many mL are in 3.5 pints? Show your work. (Points : 5) 
3.5 pints is equivalent to 1656.116 
1 pint = 473.176 ml 
3.5 pints* 473.176mL = 1656.116mL 
3. (TC...
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Alek’s latest update with complete and verified solutions
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Alek’s latest update with complete and verified solutions 
electron (symbol, charge, mass, location) e-, -1, .000549 amu or 1/1800 amu, orbiting around nucleus 
proton (symbol, charge, mass, location) p+, +1, 1.0 amu, nucleus 
Neutron (symbol, charge, mass) N0, 0, 1.0 amu 
ecide which element probably has a density most and least similar to the density of rubidium. options are fluorine, cesium, thallium, & indium. Metals are more similar to each other than they are to nonmetals. Likewise, nonm...
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CHEM133 Week 15 Lesson 7 Quiz
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1.	Question: A sample of oxygen gas has a volume of 3.52 L at 27°C and 800.0 torr. How many oxygen molecules does it contain? 
2.	Question: Consider a sample of gas in a container on a comfortable spring day. The Celsius temperature suddenly doubles, and you transfer the gas to a container with twice the volume of the first container. If the original pressure was 12 atm, what is a good estimate for the new pressure? 
3.	Question: Gas A and gas B are combined in a flask at initial pressures of 1...
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TMC Practice Exam A + B Questions And Answers Rated A+.
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TMC Practice Exam A + B Questions And Answers Rated A+. 
 
 
 
 
A 52 year-old post-operative cholecystectomy patient's breath sounds become more coarse upon completion of postural drainage with percussion. The respiratory therapist should recommend: 
 
A. Continuing the therapy until breath sounds improve. 
B. administering dornase alpha. 
C. administering albuterol therapy. 
D. deep breathing and coughing to clear secretions. - correct answer. D. deep breathing and coughing to clear secret...
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CHEM133 Week 7 Midterm Exam (Spring)
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1.	Question: Dry ice (carbon dioxide) changes from a solid to a gas at –78.5°C. What is this temperature in °F? 
2.	Question: The state of matter for an object that has both definite volume and definite shape is 
3.	Question: In 1828, the diameter of the U.S. dime was changed to approximately 18 mm. What is this diameter when expressed in nanometers? 
4.	Question: A piece of antimony with a mass of 17.41 g is submerged in 46.3 cm3 of water in a graduated cylinder. The water level increases t...
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CHEM 113 CHAPTER 9 AND 10 PRACTICE QUESTIONS AND ANSWERS CORRECT SOLUTION LATEST UPDATE 2024
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1. Which of these properties is/are characteristics(s) of gases? 2. If the amount of a gas is tripled and the volume of the container is also tripled the new pressure of the gas will: 3. You’re at the zoo and have a big red 3.200 L helium balloon. The barometric pressure is 790.0 mm Hg. Then you hear the roar of a lion. Startled, you accidently release the balloon. It flies away. By the time it reaches the clouds the atmospheric pressure is only 0.3000 atm. What is the new volume of the balloo...
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