想請教第三題，只寫的出反應式

2. 汙水中的需氧廢料在氧化時會消耗水中的溶氧,影響水中生物的生存。在一定的條件下, 將汙水試樣稀釋後,使用過量的過錳酸鉀(KMnO4)或二鉻酸鉀(KCO-)等化學藥劑 與汙水試樣充分反應,再以硫酸銨亞鐵溶液滴定上述過量的化學藥劑,即可測得汙水試樣 所消耗的化學藥劑用量。將化學藥劑的用量轉換為相對應的氧氣量,即為汙水試樣中所含 需氧廢料完全氧化時所會消耗的氧氣量,稱為此汙水試樣的化學需氧量(Chemical Oxygen Demand,簡稱COD)。COD為測定水污染程度的重要指標之一,常用ppm表示,即每1 公升汙水試樣所含需氧廢料完全氧化時所消耗的氧氣毫克數。 (1)測量COD時,為何需要稀釋汙水試樣?(1分) CROS (2)加入過錳酸鉀或二鉻酸鉀的用途為何?(1分) (3)若5.0mL的汙水試樣需消耗0.08mmole(毫莫耳)的二鉻酸鉀,才能使需氧廢料完全氧 化,則此汙水試樣的化學需氧量為若干ppm?(2分,需寫出算式) 2 3+ K Cr ₂017 - - 2 Cv³ (be-35) 10³ mol 0222H20(4e-轉) 3,000:1 1 45 Satak 50 140 30 將編 值) 為作

請問理化要怎麼讀哇..🤧 讀完了但看到有計算的題目還是會一臉矇😭😭😭

Chlorophyll is the chemical that ___ the leaves of plants green 答案是makes 為什麼不能用lets

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？

我想問 理化週期表是上面的全部都要背嗎？ （這是我網路上找的圖）

化學元素週期表 1 -- 1 原子序 He 氢 10 Ne 氛 元素符號 B 丽 2 9 F 氣 N氮 0氣 H氫 | 16 元素中文名 13 AL 15 P | 18 Ar Li 鲤 | 11 Na 纳 | 19 K 鋼 17 Cl 氣 3 C 碳 14 Si 的 32 Ge 錯 22 Ti 站 23 V 29 Cu 28 Ni 鎮 34 Se 33 | As 神 36 Kr 4. 26 Fe 鐵 44 Ru 27 Co 钻 45 Rh Be 纳 | 12 Mg 錄 20 Ca 鈣 38 Sr 细 56 Ba 组 ( 88 Ra 銷 21 SC 銳 39 Y 纪 Br 澳 S硫%陋me磅 50 52 Te 54 Xe Sn 37 Rb 细 55 Cs 5 41 Nb 妮 73 Ta 40 Zr 錯 72 Hf 鈴 104 Rf 封 24 Cr Mn 銘 註 42 43 Mo TC 銷 錯 74 75 W Re 统 106 | 107 Sg Bh 號 缸 30 31 Zn Ga 鋅 48 | 49 Cd In 錦 轴 180 | 181 Hg TU 无 蛇 112 113 Cn Nh 鋼 51 Sb 鲜 83 Bi 57 46 Pd 塑 78 Pt 鉑 | 110 Ds 鍵 53 | 确 85 At 47 Ag 銀 79 Au 金 111 | Rg 銷 18 84 Po 86_ Rn 6 71 76 Os 號 108 Hs 望 針 77 Ir 软 | 109 Mt 錢 绝誌 82 Pb 錯 | 114 FI 鉄 87 Fr 9 | 105 Db 115 Mc 鍵 116 Lv 雞 | 117 | 118 Ts Og 7 103 當 1 2 3 4 5 6 7 8 10 11 12 13 14 15 16 17 18 鋼系金屬 63 Eu Gd 65 Tb 57 La 鋼 89 Ac 69 Tm s就 60 Nd 鼓 192 萌 58 59 Ce Pr 韩 90 91 Th Pa 針 鍵 錯 | 61 Pm | 鉅 93 Np 繞 62 Sm 多 | 94 Pu 鋪 66 67 68 Dy Ho Er 鏡 缺 98 99 | 100 Cf Es Fm 獎 銷 70 Yb 鏡 102 No 銘 | 71 Lu 銷 | 103 Lr 銷 鋼系金屬 95 Am 96 Cm 编 97 Bk | 101 Md U蝕 轴 銷 Liit 学 生活 Fe CC BY-NC-ND 3.0 分享,禁止使用商業用途、修改」 Created by Life 生活化學 - https://www.lifechem.tw v v.2018.4

請問大學有機化所有英文命名的規則是如何?

I prefer chemistry to physics. 請問這句翻譯成中文是甚麼意思呢？？

求解，不知道有沒有寫錯，請幫我檢查一下，謝謝😭

AT 中 人只wasting 2 1ng 人IS keep for Grandma. (A)hopp She's too sick to live through the end ofthe year (說) praying (CCy) holding (D) drowning 人 10. (/ 1 )Dad is checking the water 由 (2) (信訪遇GLGO 二 du0Qertie tt 《A) pipe_(B)puppy (CCG)pet (上 2 加 《@3》 Monkey IS 也e first animal sign ofthe Chinese zodiace。(A )Rooster (B)Tiger (D)Rat )放 ClyNes York is one ofthe (D)chemical 1全 (人 the glue? ITwant to 品全有 paste (D)hold 1]4 ((A)A guide dog takes about two years to [你訪員 于半議 (85 ) lanterns (CC )swimmers (D) sheep ON (全 Tborrow the glue from you to drown (C)paste (D)hop GIICSITIIh OH 全說點 于 個遇 ) modern (C)poslittve my favorite actor?s photos in my notebook. (A)paint (B (人in (See 0 Sim ll and goats. Letme give her a hand. (A)1taboo the stamp onto the envelope? (A)continue (B) 了沒 過 疙ina was caught her classmate's answers during the seience test. (A)guessing (By) copying (Clending (D )pasting 有人 (et 1s one of the activities for Chinese New Year_(A)riddle parties (B)abig family dinner (C)spring couplets (D )animal signs 19. (!1Since Jolin played a trick on Jay, he has been waiting for achance to Win first place_(C)guess riddles (D)getmarried 胸人還(信|避列其 are not able to see anything, are they? (A)blind (By)young (C)old 9 Sen

求解2.3.6題 謝謝

0 ( (?》 3 A: Kelly hasnt been herself lately ontest B: Maybe she's under great stress: the singingc eds fo be rm, soI en talking ! is next week | AAre you ready to lend an ear? Will it affe e 【 同 i affect her perforfrnant 澀 同 3 (C ls there anything bugging her YaShould she be responsible for 1 行 ) 四、克漏字選摔。(每題2分,共 14分) 1 Reading Greek mythology may be bb English words. Some ofthe words, like ecA#4o, WerTe for memoriztng 5 品卻 ns wehear tt 3 _narme knows, the njlhfe. 0 Greek. When we hear asound echo, it mea more than once. This word came from aa nymph - was Echo in Greek mythology, _4_everybody ee King ofthe gods, Zeus, has_5_awife but also many other 3 Women on Earth. To help Zeus cheat on : Hera, Zeus's Wilfe, Echo sometimes Stopped Hera with avery long Story When % 之eus was dating other women. Echo's volce _6_ away When 3 Hera found out what she was doing. From then on, Echo ? couldnt speak exceptto_7_the words 9 others, and thatsS how echo got its meaning-. ! Al 希臘的 ; 希臘語 mythology 神話 | nymph 仙女 ) 誤 22922o9o2oooooooooo Kend. ooo<= 點 (哆 Gi (close6 廬 (B) helpful 人 計 G@ chemical (D) responsible (及 2 lemttoz han eiorloz人條Wento 1 0@borowedfrom 0used for 3 her 1 勵Whos (Q which (0D whose As中區: 全For ,(QExoept DUmtil (Botonly (0 either (Oheither 說 Y ataken 人0 hadbeentaken (8) repeat (0 waste。 (0D) affect ivys 1 1 革20tbc 1 和2 (每格1分,共10分