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化学 高校生

【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)... 続きを読む

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)

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英語 高校生

この答えを教えてください! 問題が多くてすいません。 よろしくお願いします!

英文を読み,下の設問に答えなさい。 When many people hear “Chanel," they think of luxury, but Chanel's/childhood was not luxurious at all. Chanel's mother died when she was 12 years old. After that, her father took her to a Catholic orphanage and (Dleft her there. Chanel never saw her father again. In those days, sewing was more important for girls than studying, so the nuns taught the girls in the orphanage ( ) sew. Chanel got better very quickly. One day, she changed her uniform and made のit prettier. ③She was careful not to break the rules. Everyone loved her designs. She realized she had a talent for fashion design. After Chanelleft the orphanage at age 17, she took every chance that she could get. When Chanel became a famous fashion designer, she said, “My life didn't please me, so I created my life.” Ifyou are unhappy with your life, remember her words. If you try, you can change your life! 1) 下線部のと同じ文法と意味で使われている left をひとつ選び, 記号で答えなさい。 イ She left her umbrella in the train. (2点) ア Aletter was left on the table. エ I left his house at eight. ウ I have a pain on my lef hand. )の中に入る語句として適したものを下から選び, 記号で答えなさい。 オ which to (2点) ウ how to where to エ ア what to イ when to (2点) 3) 下線部2の itが表す語を本文中から2語で抜き出しなさい。 (3点) 4) 下線部3を日本語にしなさい。 5) 本文の内容に合うように,( )に適切な語を書きなさい。 (完答2点×3=6点) i) In those days, ( )is less important for girls than ( ii) Chanel's designs were( )by everyone. )created ( ) life. i) Chanel's life didn't pleased her, so (

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