Molar volume - Study guides, Class notes & Summaries
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AS level OCR Chemistry Exam Questions And Answers (Verified And Updated)
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AS level OCR Chemistry Exam Questions 
And Answers (Verified And Updated) 
Isotopes - answerDifferent atomic forms of the same element. Atoms with the same number 
of protons but a different number of neutrons 
Relative atomic mass - answerThe mean mass of an atom of an element, compared to 1/12th 
of the mass of an atom of carbon-12 
Concentration= - answerNumber of moles ÷ Volume 
One mole - answer6.02×10^23 
Number of moles= - answermass ÷ molar mass 
r.t.p - answer25 ºC 
100 kPa (1 atm) ...
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OCR A Level Chemistry TOP Exam Questions and CORRECT Answers
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Isotopes Different atomic forms of the same element. Atoms with the same number of 
protons but a different number of neutrons 
Relative atomic mass The mean mass of an atom of an element, compared to 1/12th of 
the mass of an atom of carbon-12 
Concentration= Number of moles ÷ Volume 
One mole 6.02×10^23 
Number of moles= mass ÷ molar mass 
r.t.p 25 ºC 
100 kPa (1 atm)
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CHEM-C125 ASSESSMENT TEST QUESTIONS WITH CORRECT ANSWERS CHEM-C125 ASSESSMENT TEST QUESTIONS WITH CORRECT ANSWERS
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CHEM-C125 ASSESSMENT TEST QUESTIONS WITH CORRECT ANSWERS 
 
A solid sample contains both NaOH and NaCl. 0.500 g of this solid sample was dissolved in water to make a 20.0 mL solution and then this solution was titrated by 0.500 mol/L HCl solution. If 22.5 mL of HCl was used to reach the end point, what is the mass % of NaOH in the original solid sample? 
NaOH + HCl --> NaCl + H2O - Answer- 90 
 
During titration, it is very common to have some NaOH spilled to the inside wall of Erlenmeyer fl...
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Download this complete, and updated CCEA AS2 Chemistry definitons|GUARANTEED SUCCESS
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Empirical formula 
A formula which shows the simplest whole number ratio of atoms of each element in a compound 
 
 
 
Molecular formula 
A formula which shows the actual number of atoms of each element in a molecule 
 
 
 
 
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Molar Gas Volume 
The volume of one mole of gas under specified conditions of temperature and pressure e.g 293K and 1 atmosphere pressure 
 
 
 
Homo...
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Edexcel A-level Chemistry Essential Practical’s Methodologies with Expected Solutions. Verified for new updates
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Core practical 1 - measuring the molar volume of gas 
METHOD [7] 
METHOD: 
1. known volume of ethanoic acid in boiling tube 
2. place 0.05g of calcium carbonate in test tube 
3. weigh contents 
4. tip contents into ethnic acid and seal with bung 
5. measure volume of gas produced, collected in a measuring cylinder over a water bath 
6. Reweigh the test tube 
7. Repeat experiment increasing the mass of calcium carbonate by 0.05g each time. 
do not exceed 0.4g of calcium carbonate 
core practical ...
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Capstone Maternal Newborn ATI Exam Practice Questions and Answers 100% Pass
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Capstone Maternal Newborn ATI Exam Practice 
Questions and Answers 100% Pass 
What hormone is the basis for pregnancy testing? - Correct Answer ️️ -Human 
chorionic gonadotropin 
Excreted by the placenta and promotes the excretion of progesterone and estrogen. 
Uterine fibroid - Correct Answer ️️ -Can increase the risk for postpartum hemorrhage 
due to the increase in blood supply to the uterus, which supports the fibroid. 
Will undergo serial US examinations during pregnancy to monitor ...
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Creighton University Bio 201 Unit 2 Test review Questions With 100% Correct Answers.
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What is Fick's Law? What influences diffusion - Answer-The molar flux due to diffusion is proportional to 
the concentration gradient 
F=kA((c1-c2)/d)) - Answer-F is rate of diffusion 
K is diffusion constant 
A is surface area for diffusion 
D id distance for diffusion (ex: membrane thickness) 
C1-C2 is difference in concentration 
How does the diffusion of uncharged and charged particles differ? - Answer-Uncharged particles diffuse 
irrespective of the concentration of each other. Charged par...
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Chem 219: Exam 3 Questions With 100% Correct Answers
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Chem 219: Exam 3 Questions With 100% 
Correct Answers 
Avogadro's Law 
equal volumes of gases at the same temperature and pressure contain equal numbers 
of molecules 
Boyle's Law 
Boyle's Law states that at constant temperature and moles, pressure and volume are 
inversely proportional. 
Mathematically this is written as: PV = PV 
Charles' Law 
the law that states that for a fixed amount of gas at a constant pressure, the volume of 
the gas increases as the temperature of the gas increases ...
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Clinical Chemistry Exam 1 & (Book Chapters 1,2,3,4 Review Questions) Rated A+
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Clinical Chemistry Exam 1 & (Book Chapters 1,2,3,4 Review Questions) Rated A+ Reverse osmosis (RO) is describes as a process: In which water is forced through a semipermeable membrane that acts as molecular filter. 
Activated carbon filters remove: Organic Compounds from water 
A 0.22 micron filter will remove: Particles with a diameter of 2.2 microns 
The unit of resistivity is: MQcm 
The electrical resistance measured between opposite faces of a 1.00 cm cube of an aqueous solution at a specifi...
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AS Level Chemistry Complete Guide Question And Answers.
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Atomic number - correct answer Number of protons in an element 
 
Mass number - correct answer Number of protons and neutrons 
 
Ion - correct answer Electrically charged particle formed by the loss/gain of electrons 
 
Relative masses of P,N and E - correct answer 1,1, 1/2000 (respectively) 
 
Isotopes - correct answer Atoms of the same element with different number of neutrons but same number of protons. 
 
What are steps of mass spectroscopy? - correct answer Ionisation, Acceleration, Deflect...
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