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Chemistry Senior High

【英語ですみません】最後の12番は何を書いたら良いのでしょうか…? Video C の実験では、aqueous solution にlead(ii) nitrate, aqueous solution にPottasium iodide を入れていました。 2KI (aq)... Read More

With lead (I) nitrate solution. This precipitation reaction produces a bright yellow solid. (point values in parentheses) Part 1: 1. Copy the unbalanced reaction below into your lab notebook. Balance the reaction by adding coefficients. (1) KI (aq) Pb(NO,), (aq) KNO, (aq) Pbl, (s) 2. a) Which trial are you assigned? b) Copy the data table below into your notebook. Watch video A (make sure it's the correct trial!) and collect your data. You may need to pause or rewatch the video, it goes quickly. (1.5) Mass of Empty Beaker (g) Mass of Beaker+ solid Pb(NO,)。(g) Volume of 1.0 M KI (aq) (mL) For the following calculations, show all your work for full credit. 3. What mass of solid Pb(N0,), was added to the beaker? (1) 4. If the solid Pb(NO,), was dissolved in 45 mL of water, what is the molarity of the Pb(NO,)。 solution? (2.5) 5. Which compound is the limiting reactant? (4) 6. What mass of lead (II) iodide (PbL,) should be produced? (2) Part 2: 7. Watch video B (make sure it's the correct trial!) to see the complete reaction and collection of the product. Copy the data table below and record your data. (1) Mass of filter paper (g) Mass of filter paper + dried precipitate (g) 8. What mass of precipitate was collected? Show your work. (1) Calculate the percent yield for the reaction. Show your work. (2) 10. For your trial, which three ions were present in the filtered solution at the end of the reaction? In other words, which three ions are still dissolved at the end of the reaction? Defend/explain your 9. answer. (3) 11. Watch video C - watch both tests for your trial and record your observations. (1) a) Add lead (II) nitrate - b) Add potassium iodide - 12. These tests were conducted to prove the identity of the limiting reactant. Considering your answers to the previous two questions, describe how these tests support the prediction you made in question 5 about which compound is the limiting reactant. (2)

Resolved Answers: 1
English Senior High

BとDを教えてほしいです

Suppose you were asked to participate in a blind taste-test of five different brands of strawberry jam. After tasting all of the jams, but before being asked to rate their quality, you spend a couple of minutes ( I 1 ) down your reasons for liking and disliking each jam. Then you rate each one on a scale from 1 to 9. How accurate would your ratings be, assuming we judged accuracy by comparing your ratings with those given bya panel of experts assembled by Consumer Reports magazine? When psychologists Timothy Wilson and Jonathan Schooler conducted this experiment with college students as their subjects, they found that the ratings the students gave to the jams had almost no resemblance to , those given by the experts. 2 They should have been able to tell which ones were good and which ones were not the jams varied widely in quality and included those ranked 1st, 11th, 24th, 32nd, and 44th best out of 45 that Consumer Reports had reviewed. Did the students have no taste for jam? Did their preferences differ from the experts'? Not at all. In a separate condition of the experiment, rather than writing the reasons they liked and disliked each jam, each subject wrote about something entirely ( 4 ): their reasons for choosing their college major. The subjects then rated the jams, and despite not having thought about them at all after tasting them, they made ratings that were much closer to those of the experts.

Unresolved Answers: 0
English Senior High

問の部分で文法ミスとかありますか?

5.世界都市ランキング 東京は3位 TOKYO 3RD IN WORLD'S MOST ATTRACTIVE' CITIES A Japanese think tank has ranked Tobkyo third in its list of the world's F most (1)(attractive) cities. The Institute for Urban Strategies has given the capital the The highest ranking went to London, which has occupied that position for nine years same spot for five straight years. running. New York held onto second place. The gap from the first two down to Tokyo The assessment uses various indicators in six categories to rank 48 major cities, They look at the economy, research and development, cultural interaction, livability, environment, and accessibility. In the economy and cultural interactioncategories, Tokyo remained in fourth place. as widened、 Shanghai was the only new name in the top 10. It kept its third place ranking for research and development. But n terms of livabilitv dropped one spot to 12th. Japan's capital is near the bottom of the rankings when 。 Comes to work style flexibility. It came 41st on that measure, which looks at how easv it: for people to do their jobs remotely. 日本のシンクタンクの「都市戦略研究所」が世界で最も魅力的な都市のランキングを発 表し、東京は5年連続で3位になりました。 (総合ランキングの) 1位は9年連続ロンドンで、ニューヨークは2位を守りました。 (2) (和訳) 1位、2位を、乳の差は直がっています 1上胎っ納 。上位10都市に新しく入ったのは上海だけでした。 ランキングは、世界の主要な48都市を対象に、 「経済「(3)( 県 聞発 「文化·交流」「居住」 (「(4) まな指標で採点されます。 東京の評価は、「経済」 と 「文化·交流」 の分野で4位、 「研究 開発」の分野で3位を 維持した一方、「居住」の点では1つ順位を落とし、12位でした。 また、在宅勤務のしやす さといった「働き方の柔軟性」では、41位と最下位に近い順位になっています。 )」「交通·アクセス」 という6つの分野のさまざ (間) [Answer in English] In which categories, is Tokyo ranked highest and lowest? Highest rank ave research ond Lowest rank develapmant flexihlity inThhu is work Style [本文中の熟語) 「 の占で」のro

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