Dichromate Study guides, Class notes & Summaries

AQA AS CHEMISTRY 7404/2 Paper 2 Organic and Physical Chemistry Question Paper + Mark scheme [MERGED] June 2022 *JUN* IB/M/Jun22/E7 7404/2 For Examiner’s Use Question Mark 1 2 3 4 5 6 7 Section B TOTAL Time allowed: 1 hour 30 minutes Materials For this paper you must have: • the Periodic Table/Data Sheet, provided as an insert (enclosed) • a ruler with millimetre measurements • a scientific calculator, which you are expected to use where appropriate. Instructions...

Practicals Chemistry AQA A-level Rated A+ Required Practical 1 - titration and making a standard solution Making a standard solution 1. weigh the required mass of solid using a sample bottle on a 2 dp balance. 2. transfer the solid into a beaker using distilled water to wash it out- preventing any solid remaining in the sample bottle. 3. reweigh the sample bottle and work out the difference. 4. Add 100cm3 of distilled water to the beaker to dissolve the solid (small volume of water) using a...

Select the procedure suitable for demonstrating secretory granules in a carcinoid tumor: A. Wilder reticulum B. PAS-aniline blue C. Snook D. Sevier-Munger D. Sevier-Munger The Sevier-Munger technique is an excellent argyrophil procedure for demonstrating carcinoid tumors. It is similar to, but shorter than, the Grimelius. In Bodian's method for nerve fibers and neurofibrils, Protargol impregnates both neurofribrils and connective tissue. Subsequently, connective tissue is rendere...

Histotechnology - Tissue FixationAdditive fixatives Mercuric chloride Chromic acid Picric acid Formaldehyde Glutaraldehyde Osmium tetroxide Potassium dichromate Glyoxal Zinc salts Nonadditive fixatives Alcohols Acetone Acetic Acid Coagulant Fixatives Mercuric acid Chromic acid Picric acid Zinc salts Alcohols Acetone Acetic acid Noncoagulant Fixatives Formaldehyde Glutaraldehyde Osmium Tetroxide Potassium Dichromate Glyoxal Are coagulant fixatives addit...

The primary purpose of fixation is - Answer To stop enzymatic action Which fixative contains picric acid, formalin, and acetic acid? - Answer Bouin The volume of fixative should exceed the volume of the tissue by - Answer 15-20 times Tissue must be washed in water after fixation in - Answer Zenkers Which fixative contains formalin, potassium dichromate, and mercuric chloride? - Answer Helly Precipitate left in tissues that have been fixed in solutions containing mercuric...

Propane (C₃H₈) reacts with oxygen in the air to produce carbon dioxide and water. In a particular experiment, 38.0g of Carbon Dioxide are produced from the reaction 22.05g of propane with excess oxygen. What is the % yield in this reaction? -94.5 -66.0 -86.4 -38.0 -57.6 correct answer: 57.6 Gaseous argon has a density of 1.40 g/L at standard conditions. How many argon atoms are in 1.00L of argon gas at standard conditions? -4.76x10²² -6.02x10²³ -3.43x10²⁵ -1.59...

Histotechnology - Fixatives, StainsAdditive fixatives - correct answers Chemically link, add themselves on to tissue and change it - Mercuric chloride - Chromium tetroxide - Zinc sulfate Nonadoptive fixatives - correct answers Organic compounds that act on tissue without chemically combining with it - Acetone - Alcohols Dissociate bound water molecules from tissue protein groups - Shrinkage, hardening with overexposure Coagulant fixatives - correct answers Establishes a network in...

Propane (C₃H₈) reacts with oxygen in the air to produce carbon dioxide and water. In a particular experiment, 38.0g of Carbon Dioxide are produced from the reaction 22.05g of propane with excess oxygen. What is the % yield in this reaction? -94.5 -66.0 -86.4 -38.0 -57.6 correct answers57.6 Gaseous argon has a density of 1.40 g/L at standard conditions. How many argon atoms are in 1.00L of argon gas at standard conditions? -4.76x10²² -6.02x10²³ -3.43x10²⁵ -1.59x1...

Histotechnology - FixationThe primary purpose of fixation is to: a. stop enzymatic action b. remove the water from the tissue c. provide support for the tissue d. autolyze the tissue - correct answers a Which of the following fixatives contains picric acid, formalin, and acetic acid? a. Zenker b. Helly c. Bouin d. Zamboni - correct answers c The volume of fixative should exceed the volume of the tissue by: a. 1 time to 2 times b. 5 times to 10 times c. 15 times to 20 ...

OCR A Level Chemistry A (H432) Chemistry B (H433)Ethanol is oxidised to ethanoic acid using acidified potassium dichromate(IV) solution. The reaction is heated under reflux using the equipment shown in the diagram below. What is the reason for heating under reflux? A. to ensure even heating B. to prevent any substances escaping C. to boil the mixture at a higher temperature D. to allow efficient mixing Your answer [1] 2. A chemist compares the rates of hydrolysis of 1-chloropropane and ...