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問題的種類

英文 國中

請問4、5、3的詳解

68 翰版國中英語(四) 4. Though the dress looked pretty, (A) and it was not expensive (B) but it looked bad on Lisa (C) it didn't look good on Lisa (D) it looked great on Lisa so she decided not to buy it. 5. Michael is good at playing many kinds of instruments (28) the guitar, and the violin well. (A) Probably (C) For example (B) After all (D) However , he plays the piano, 四、 A 題組:每題4分,共40分 07 會考修改 Robert likes to take a walk in the park after work. One day when he was walking in the park, he heard a woman calling his name. He stopped to look around and saw a little snake. Shortly after Robert saw it, it moved away. 1. Robert felt a little strange, he did not think about it too much and sat down for a rest on a bench in the park. Then he noticed the snake 2. Robert was very scared. He couldn't move away from the bench. Right at this moment, a woman behind him shouted, "Con here, Robert. You can't stay on the bench like that. 3. " In surprise, Robert turned around and said to the woman, "Excuse me, but that's not a very nice thing to say, and some people say I'm handsome, not scary." How To 4. B "I'm not talking to you," said the woman. "I'm telling Robert, my pet snake, to get down from the bench, not you." 1. (A) When (C) Before Como cad for (B) Though 2. (A) climbing up the bench A₂ (B) running after a woman (C) stopping beside his feet (D) falling down from a tree 3. (A) The bench is too small for you. (D) Because ben prund og biorial (B) The boy next to you is very handsome. (C) People will be scared when they see you. (D) The paint of the bench is still wet. 4. (A) actually (C) take care of yourself (B) for example (D) to try my best von M bench surprise M

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自然科學 大學

為什麼[A(org)]=n[An(org)]成立 (第三張圖equation 7.9) 感謝

Experiment 7 Experiment 7 The partition of Organic acid between Water and Organic solvent Objectives Understand the partition of a solute between two immiscible solvents. Introduction A chemical analysis that is performed primarily with the aid of volumetric glassware (e.g., pipets, burets, volumetric flasks) is called a volumetric analysis. For a volumetric analysis procedure, a known quantity or a carefully measured amount of one substance reacts with a to-be-determined amount of another substance with the reaction occurring in aqueous solution. The volumes of all solutions are carefully measured with volumetric glassware. The known amount of the substance for an analysis is generally measured and available in two ways: 1. As a primary standard: An accurate mass (and thus, moles) of a solid substance is measured on a balance, dissolved in water, and then reacted with the substance being analyzed. 2. As a standard solution: A measured number of moles of substance is present in a measured volume of solution - a solution of known concentration, generally expressed as the molar concentration (or molarity) of the substance. A measured volume of the standard solution then reacts with the substance being analyzed. The reaction of the known substance with the substance to be analyzed, occurring in aqueous solution, is generally conducted by a titration procedure. The titration procedure required a buret to dispense a liquid, called the titrant, into a flask containing the analyte. A reaction is complete when stoichiometric amounts of the reacting substances are combined. In a titration this is the stoichiometric point. In this experiment the stoichiometric point for the acid-base titration is detected using a phenolphthalein indicator. Phenolphthalein is colorless in an acidic solution but pink in a basic solution. The point in the titration at which the phenolphthalein changes color is called the endpoint of the indicator. Indicators are selected so that the stoichiometric point in the titration coincides (at approximately the same pH) with the endpoint of the indicator.

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