Methyl orange - Study guides, Class notes & Summaries

Equipment • Measuring cylinder (10 cm³) • Dropping pipettes • Quickfit apparatus: • Pear-shaped or round-bottom flask • Liebig condenser and tubing • 250 cm³ beaker • Glass rod • Anti-bumping granules • Apparatus for filtration under reduced pressure (Buchner funnel and Buchner flask) • Filter papers to fit the above • Balance accurate to two decimal places •Boiling tube • Melting point apparatus • Capillary tubes • TLC plate • Sample tube and li...

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) ...

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) ...

STS 322 Midterm Exam | Questions and Answers What was the first in a series of events that contributed to the Three Mile Island (TMI) nuclear power plant accident? a) a routine maintenance operation, the changing of water in a system of pipes b) production of radioactive waste c) an order from an official with the Tennessee Valley Authority d) clouds of radioactive material e) none of the above Was the cause of TMI human or mechanical error? a) human b) mechanical c) both human and mechanical ...

Cumulative Exam Review Questions and Answers Graded A+ What explains the effect observed when gas molecules move at a slower rate? The temperature drops because the average kinetic energy diminishes. The volume of the gas increases. The pressure of the gas remains constant. The density of the gas increases. Which salt forms when ammonium hydroxide reacts with nitric acid? Ammonium nitrate (NH4NO3). Ammonium sulfate (NH4)2SO4. Ammonium chloride (NH4Cl). Ammonium carbonate (NH4)2C...

lab 1: What did caffeine and ethanol do to the heart rate of the Daphnia? correct answers Caffeine speeds up the heart rate and alcohol slows it down lab 1: know independent vs dependent variable correct answers independent- one or more factors that the scientist varies during the experiment dependent- measured in order to determine if it changes in response to the independent variable lab 1: mean, median, mode, range correct answers mean- average, median- number in the middle, mode- occu...

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...

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) ...

EATRIGHT prep practice: nutrition care, Questions and answers, VERIFIED/ A community nutrition needs assessment must occur in the sequenced order:(5) - -Set the parameters of the assessment, collect data, analyze and interpret the data, share the findings, and set priorities. What is the osmolality of an isotonic enteral formula? - -The osmolality of an isotonic solution (one that is similar to the osmolality of the blood) is approximately 300 mOsm/kg. Which of these requires complian...

OCR A Level Chemistry A (H432) Chemistry B (H433) PAG 2: Acid-base titration Exam Questions and Mark SchemeThe equation for the reaction of aqueous phosphoric(V) acid, H3PO4, with aqueous sodium hydroxide, NaOH(aq) is shown below. H3PO4(aq) + 3NaOH(aq) → Na3PO4(aq) + 3H2O(l) 25.0 cm3 of a 0.200 mol dm−3 H3PO4(aq) is titrated with 0.600 mol dm−3 NaOH(aq). Which statement is correct? A. The end point occurs when 25.00 cm3 of NaOH(aq) has been added. B. The end point occurs when 75.00 c...