Phenolphthalein - Study guides, Class notes & Summaries
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CHEMISTRY PRAXIS Practice Exam Questions And Answers (Updated And Verified)
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CHEMISTRY PRAXIS Practice Exam 
Questions And Answers (Updated And 
Verified) 
What is the negative log of 1 X10⁻⁷ - answer7 
When [H₃O⁺] = [OH⁻] the solution is acidic or basic or neutral - answerneutral 
The concentration of H₃O⁺ and OH⁻ in pure water at 25°C - answer1X10⁻⁷ 
Kw - answer1X10⁻¹⁴ 
pH + pOH = - answer14 
What is the concentration of Hydrogen ion when the pH is 2 - answer1X10⁻² 
Using the - log [H⁺] or - log [H₃O⁺] helps you find the - answerpH 
U...
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LIBERTY HIGH PRESSURE BOILERS (1069*) 2024 QUESTIONS WITH CORRECT ANSWERS ALREADY PASSED AND VERIFIED
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Boiler water is treated in order to prevent 
a) sludge, mud, pitting, corrosion 
b) foaming, corrosion, carryover, sludge 
c) sludge, corrosion, scale, carryover 
d) scale, sludge, mud, pitting 
e) foaming, carryover, pitting, corrosion - CORRECT ANSWER c 
 
Dissolved solids in raw water 
a) cause pitting of boiler surfaces 
b) cause grooving of piping surfaces 
c) are organic matter 
d) cannot be removed with filters 
e) cause corrosion of boiler surfaces - CORRECT ANSWER d 
 
B...
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CHEM 104 Final Exam; Questions and Answers 100% Solved
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CHEM 104 Final Exam; Questions and Answers 
100% Solved 
In this experiment scrap aluminum metal will be converted to the compound called ___.the 
name commonly refers to _____________, which is a crystaline white solid. Correct 
answer-alum; potassium aluminum dodecahydrate 
is the process of determining the exact concentration (molarity) of a solution Correct 
answer-standardization 
is one type of analytical procedure often used in standarization. in a this, an exact volume of 
one substa...
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PAPER 1 CHEMISTRY QUESTIONS AND CORRECT ANSWERS (graded A+}
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PAPER 1 CHEMISTRY 
QUESTIONS AND 
CORRECT ANSWERS 
(graded A+} 
they are all soluble - correct answer-What is true about common 
sodium, potassium and ammonium salts? 
hydrogen ions - correct answer-What are acids in solution a source 
of? 
hydroxide - correct answer-What are alkalis in solution a source of? 
7 - correct answer-What is the pH of a neutral solution? 
low (less than 7) - correct answer-Do acidic solutions have high or 
low pH values? 
high (greater than 7) - correct answer-Do alka...
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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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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 B Salters Chemistry exam 2023 with 100% correct answers
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History of the atom correct answersSolid sphere 
Johnson - Plum pudding (-ve electrons) 
Rutherford - fired alpha particles at thin gold sheet, a few were deflected backwards - tiny +ve nucleus, surrounded by cloud of -ve electrons 
Electrons in shells/ energy levels 
 
Percentage yield equation correct answersactual yield/theoretical yield x 100 
 
Making new concentrations equation correct answersvol to use = final conc/initial conc x vol required 
 
Acid-alkali titrations correct answersUse p...
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AQA A Level Chemistry Paper 1 2022 SOLUTION 100% REVISED 2023//2024
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Bronsted-Lowry acid - ANSWER a proton donor. 
Bronsted-Lowry base - ANSWER proton acceptor 
What is H3O+? - ANSWER hydronium ion 
definition of pH - ANSWER -log10[H+] 
How do you get [H+] from ph? - ANSWER 10^(-pH) 
the ionic product of water - ANSWER [OH-][H+] 
Is dissociation an endo or exothermic reaction? - ANSWER endothermic 
Why is the concentration of water not included in Kw? - ANSWER The concentration of 
water is so large and constant the equilibrium equation can be simplified 
How do...
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Bio 121 Exam 1|59 Questions with 100% Correct Answers | Updated | Guaranteed A+
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A complete list of the products of cellular respiration: - ️️CO2, H2O and energy. 
 
A metabolic process by which cells secure energy from various compounds is - ️️Cellular respiration. 
 
Which process is the most efficient? - ️️Cellular respiration. 
 
A pathway used by animal cells in oxygen deficient conditions is - ️️lactate fermentation. 
 
What is the pH indicator we will use in this experiment? - ️️phenolphthalein 
 
A complete list of reactants in cellular respiratio...
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Acids And Bases Lab Study Guide Test 2024.
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Acids And Bases Lab Study Guide Test 2024. 
what are acids and bases according to the bronsted lowry theorem - correct answer acids are hydrogen ion donors, bases are hydrogen ion acceptors. 
 
what does the bronsted lowry theorem state - correct answer each acid has corresponding base, called the conjugate base, that is formed when acid loses hydrogen ion. 
 
what is the equation for the bronsted lowry theorem - correct answer HA + H₂O → H₃O⁺ + A⁻ 
acid ← hydronium conjugate base 
 ...
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