第三題和第四題拜託詳解

高中化學習作 | CHEMISTRY BYCIE. 3.下列敘述哪些正確?(應選3項) Tee D (A)酸性水溶液中只有氫離子存在 (B) NaCl 水溶液不使紅色石蕊試紙變 藍 (C) NaOH 溶解在水中是吸熱反應 (D)在 45 °C 的純水中, pH+pOH<14 (E)酸鹼中和是放熱反應 3) 4. pH 值均為 4.0 的鹽酸及醋酸水溶液各20 mL,下列有關兩溶液的比較敘 如飯 AUT 无法完全解離 述,哪些正確?(應選3項) 想同时相同 (A)兩溶液的體積莫耳濃度:醋酸>鹽酸 (B)兩溶液的[OH⁻]:醋酸>鹽 晚酸 (8)欲以同一NaOH(aq) 中和兩溶液,所需的NaOH(aq)之體積:醋酸 > 鹽酸 (D)兩溶液的 [H+]:鹽酸> 醋酸 (E) 25 °C 時,兩溶液的 pH + pOH 均等於14 (QC)5.下列有關水與水溶液的敘述,哪些正確?(應選2項) (A) 80 ℃ 時,pH + pOH>14 (B) 80 °C 時,pH = 7 為鹼性 (C) 10 ℃ 時, pH = 7 為鹼性 (D/25 °C時,pH + pOH = 14 (E)在 10 ℃ 與 80 ℃ 下的兩 杯 pH 均為 1 之溶液,前者的 [H+]較大 (Res Re 四 某節目白 否屬實。 原來 一時興起, 而馬桶上 冰為了活 3 間許久未 裡,並靜 些,但成 雪山一般 含有碳

請問第16、17要怎麼作答

It's widely known that bees are important for our ecosystem and that they are facing increasing threats from modern agricultural practices involving pesticides. What many of us don't know, 16. (is that some industries should shoulder a bigger share of blame than they're given.) The almond industry, for instance, has quite an adverse impact on bee colonies. One potential harm to bee colonies is the stress caused by transporting them over long distances to almond orchards for the task of pollination. This transportation can be stressful for the bees, hence 17. them more vulnerable to diseases and pests. Moreover, since they're 18. having limited food sources aside from almond flowers further weakens bee colonies. Still another problem is the of honeybees to pesticides and other chemicals used in almond production. 19. 20. and One sustainable solution is to make habitats and species within almond orchards more stable. By creating various ecosystems and introducing other insects among almond trees, at least we can ensure enough food supply for bees and even lower the use of pesticides for almond trees in the long run. A 16. (A) therefore (B) however C17. (A) make A (B) made 18. (A) faced with a great increase in demand (C) looked after by beekeepers carefully (B) delivery 19. (A) cultivation 2 (C) in addition (D) for a start (C) making (D) to make (B) raised in their natural environment (D) physically removed from their habitat (C) exposure (D) restriction asant (D) particular

第一張是題目，第二張是答案，請大家看一下我哪裡寫錯了，一直跟答案對不上，如果有人知道如何解，請讓我知道如何求得答案，謝謝

1.1 模擬測驗 環境化學 Environmental Chemistry 9克的純硫酸(H2SO4)加水至0.5升,試求此硫酸溶液的重量百分濃度?體積莫 9x10² 耳濃度?含多少ppm?當量濃度? 0.5 500

求解

三填(10題,每題2 分,共 20 分,答錯無倒扣) 21 for these, though. Why are we so different? Some people hate the feeling of being afraid and avoid situations like visiting ghost houses, watching scary movies, and telling ghost stories around the campfire. Others have a Researchers have found the answer lies in how the chemicals in our brain work. When we are afraid, our bodies can make fight-or-flight response, a reaction that helps us to decide whether to fight or escape. In these situations, our brains combination of hormones. Interestingly, the way our bodies respond to these_20determines whether we get to the movie theater to see a horror film or not. 22 a a have Psychologists say that people who 24 themselves in scary situations need to make sure that they are in a safe environment. For example, people who visit ghost houses have the _25 that they are going to be scared. They may 26 fear when Godzilla or Count Dracula starts chasing them. However, they know the _27aren't real, so they can enjoy the high feeling associated with the fight-or-flight response. Some people also feel a sense of confidence after they live through a 28 situation, even if they know it is false. How about you? When a scary 29__ turns up, will you escape or enjoy the fear? No matter which one you choose, there is no doubt that no one wants to face the $30. (A) horrible (C) release in real life. It's natural that everyone will escape from real danger. (D) tragedy (B) place (AC) expectation (AD) monsters (E) passion (BC) creature (AB) sudden (AE) chemicals

求題目的過程與解答，問題四延續問題三，謝謝

Problem 3 Creating a 0.1 Normal Solution Suppose you must determine the amount of hydrogen halides (HCI, HBr and HF) in the flue gas leaving a chemical reactor. The emission sampling train for hydrogen halide determination calls for a total of 200 mL of 0.1 N H₂SO4 as an absorbing solution. The absorbing solution will be located on the impingers of the sampling train. How many grams of H₂SO4 should be added to water to create 200 mL of a 0.1 N H₂SO4 solution? > The chemical reaction of H₂O and H₂SO4 is as follows: H₂SO4+H₂O 2H++SO₁²+H₂O 4 > Approximate atomic weights of elements: H=1, S=32, O=16

求3、4小題解法🙇🏻‍♀️

096 配合單元練習:基礎題單選3、單選4 是中东版水 SO CHEMISTRY 2 100-200 2 某單質子弱酸,其分子式為CaH8O2,在25°C 時,取該酸 2.2 克配製成 100 mL 的水溶液, 測得該溶液 pH 值為3,已知 10=3.16,則: 20 (1)試計算依上述方式配製的 100 mL 水溶液中,單質子弱酸之解離百分率%。 (2)試計算該單質子弱酸於25°C時之解離常數。福寶出2001 号 (3)將該單質子弱酸水溶液加水稀釋至10L,試計算稀釋後水溶液的pH值。 T (4)試計算該單質子弱酸稀釋成 10 L 水溶液時,單質子弱酸之解離百分率%。(ps) (5)比較弱酸水溶液稀釋前後的解離百分率,可歸納出什麼樣的結論,簡述並解釋之。

想問3-9的a跟c

Problems 3-1. Explain the difference between *(a) random and systematic error. (b) constant and proportional error. *(c) absolute and relative error. (d) mean and median. *3-2. Suggest two sources of systematic error and two sources of random error in measuring the length of a 3-m table with a 1-m metal rule. 3-3. Name three types of systematic errors. *3-4. Describe at least three systematic errors that might occur while weighing a solid on an analytical balance. *3-5. Describe at least three ways in which a systematic error might occur while using a pipet to transfer a known volume of liquid. 3-6. Describe how systematic method errors may be detected. *3-7. What kind of systematic errors are detected by varying the sample size? 3-8. A method of analysis yields masses of gold that are low by 0.4 mg. Calculate the percent relative error caused by this result if the mass of gold in the sample is (a) 500 mg. (b) 250 mg. V(c) 125 mg. (d) 60 mg. 3-9. The method described in Problem 3-8 is to be used for the analysis of ores that assay about 1.2% gold. What minimum sample mass should be taken if the relative érror resulting from a 0.4-mg loss is not to exceed *(a) -0.1%? (b) -0.4%? (c) -0.8%? (d) - 1.1%? 3-10. The color change of a chemical indicator requires an overtitration of 0.03 mL. Calculate the error if the total volume of titrant is percent relative (a) 50.00 mL. (c) 25.0 mL. 3-11. A loss of 0.4 mg of Zn occurs in the course of an percent relative analysis for that element. Calculate the error due to this loss if the mass of Zn in the sample is *(b) 10.0 mL. (d) 30.0 mL. 190 (c) 188 (d) 4.52 x 103 4.63 x 103 4.53 x 10 ³ √6 *(a) 30 mg. (b) 100 mg. *(c) 300 mg. (d) 500 mg. 3-12. Find the mean and median of each of the following sets of data. Determine the deviation from the mean for each data point within the sets, and find the mean devi- Vation for each set. Use a spreadsheet if it is convenient. *(a) 0.0110 0.0105 (b) 24.53 0.0104 24.68 24.81 24.77 39.61 862 (f) 850 MA 3-13. Challenge Problem: Richards and W the molar mass of lithium and colle data. 24.73 Experiment 1 2 3 4 5 6 194 447 X 10 7 448 X 107 4.58 X 10 (a) Find the mean molar t workers. (b) Find the median molar ma (c) Assuming that the cam molar mass of lithium is the absolute ertor and of the mean value demi Willard. (d) Find in the chemical ues for the molar mus since 1910, and ag a table or spreadshera 1817 given in the a Richards and Willd. Com mass versus year to la of lithium has chang Suggest possible abruptly about 18 ant de (e) The incredibly deals Richards and W that major changes will occur. Disc calculation in pat (f) What factors ha since 1910? (g) How would you mass? 6See Chapter 2 of Applications of Microsoft Excel in Analytical Chemistry, 4th ed., for information about statistical 7T. W. Richards and H. H. Willard, J. Am. Chem. Soc., 1910, 32, 4, DOI: 10.1021/ja01919a002. built-in statistical functions. "Answers are provided at the end of the book for questions and problems marked with an asterisk The I of ₂ or inc rce of able vas error c often in individu ate resul data in rtainties. dimensio andom e analysts The result

請問第87和90題🙏

AC pd AS (C) highest melting point of any metal (D) metal's highest melting point of any 87. Biochemists use fireflies to study bioluminescence, (A) the heatless light given off by certain plants and animals (B) certain plants and animals give off the heatless light (C) which certain plants and animals give off the heatless light (D) is the heatless light given off by certain plants and animals 88. Canada has two official languages, (A) they are French and English (B) French and English (C) which they are French and English (D) French and English they are a shock wave caused by a convulsion deep in the ground. 89. An earthquake (A) is (B) that is (C) as (D) although 90. Kenyon Cox, an art critic and painter, best known for his murals, portraits, and decorative designs in public buildings throughout the United States. (A) who is (B) he is (C) is (D) and he is

我想問下英文的chemical formula and equation差在哪？ 還是同一個意思不同用法？

請問要怎麼把圖一的表格匯入到phpmyadmin裡呢？我結構是設定圖二這樣，也有試過load data infile了是圖三那樣但都錯誤，拜託大家幫我解惑，想了兩天還是沒有頭緒。

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