Exams & Certification
Write out the chemical reaction for the dissociation of acetic acid, CH3COOH, in water and expression of its equilibrium constant. b/ What is the pH of a 5M acetic acid solution given its Ka= 1.7510-5at 25oC. c/ Given that the Kaof acetic is 1.7010-5at 5oC.Calculate the Kaof the acetic acid at 95oC.Write out the chemical […]
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A refrigerator using Carnot cycle requires 1.25 kW per tonne of refrigeration to maintain a temperature of −30°C. Find: (a) COP of the Carnot refrigerator, (b) temperature at which heat is rejected; and (c) Heat rejected per tonne of refrigeration. The Correct Answer and Explanation is : Solution: Given data: (a) COP of the Carnot
(1) What metamorphic rock is formed when a limestone is metamorphosed? (2) When the parent rock is a limestone or quartz sandstone, what physical property of the resulting metamorphic rock is used to indicate the intensity of metamorphism? (3) Name three minerals that are stable at the widest range of temperatures and pressures. 1. 2.
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A.) Enter the formula of the conjugate base for the acid HCO3-. Express your answer as a chemical formula. B.) Enter the formula of the conjugate base for the acid CH3-NH3+. Express your answer as a chemical formula. C.) Enter the formula of the conjugate base for the acid HPO42-. Express your answer as a
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The correct way to measure the screen size of a computer monitor is? explainMultiple Choice A. from top to bottom. B. diagonally from one comer to the other. C. from right to left. D. from top to left. The Correct Answer and Explanation is : Correct Answer: B. Diagonally from one corner to the other.
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For an effective group sales presentation, a salesperson should: A. refrain from interacting with the buyers until the end of the presentation. B. greet the group as a whole instead of Individually. C. arrive early and greet individuals personally as they arrive. D. connect with the buyers at a group level from the very beginning.
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Simplify (1 – tan²x)tan 2x tan x The Correct Answer and Explanation is : To simplify the given expression: [(1 – \tan^2x)\tan 2x \tan x] Step 1: Use the Double-Angle Identity for (\tan 2x) The double-angle identity for tangent is:[\tan 2x = \frac{2 \tan x}{1 – \tan^2x}] Substitute this into the expression:[(1 – \tan^2x)\cdot \frac{2
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The production possibilities curve illustrates that: A “If society is efficient, it can produce more of one good only if it reduces output of another good. B There are no opportunity costs in a wealthy economy. C Constant opportunity costs always exist. D Society can always produce more of all goods simultaneously. The Correct Answer
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The typical supply curve illustrates that: price and quantity supplied are unrelated. other things equal, the supply of the good creates its own demand for the good. other things equal, the quantity supplied for a good is positively related to the price of a good. other things equal, the quantity supplied for a good is
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What is the electron configuration of the element in the 4th period of Group 5A (IUPAC Group 15), using an appropriate noble gas symbol for the core electrons? (A) [Kr] 4s2 3d10 4p5 (B) [Ar] 4s2 3d10 4p3 (C) [Ar] 4s2 4p3 (D) [Kr] 4s2 4p5 The Correct Answer and Explanation is : Correct Answer: