不用客氣

[匿名]

回覆: 1

2016-05-05 4:43 pm

Calculate pOH?

[匿名]

回覆: 2

2016-05-04 4:18 pm

Calculate molar concentration of H+?

[匿名]

回覆: 2

2016-05-02 3:46 pm

Chemistry help ASAP? Chemical Kinetics? please explain with work if possible i just don't understand.?

[匿名]

回覆: 1

2016-04-28 4:48 pm

A sample of water contains 100mg/l of Ca2+ and 10 mg/l of Mg2+. Calculate the total hardness in mg/l as CaCO3?

[匿名]

回覆: 2

2016-04-27 5:25 am

For the following reaction,?

[匿名]

回覆: 1

2016-04-26 7:11 am

Chemistry Problem?

[匿名]

回覆: 5

2016-04-26 5:48 am

What would be the roots of this equation in factored form?

[匿名]

回覆: 1

2016-04-17 5:34 pm

A solution is 0.10 M in Ca(NO3)2. What would the concentration of NaOH need to be for a precipitate of Ca(OH)2 to form?

[匿名]

回覆: 3

2016-04-11 8:15 pm

Just to be sure whats the binomial expansion of (2x+5)^4?

[匿名]

回覆: 2

2016-03-30 4:27 pm

Pre-calculus/Trigonometry problem 12?

[匿名]

回覆: 2

2016-03-29 10:20 am

有16個人能夠湊齊12個星座的機率怎麼算?

[匿名]

回覆: 2

2016-03-28 2:26 pm

Find the points of intersection of the circles. x^2+y^2-18x-4y+35=0 and x^2+y^2+2x+6y-15=0?

[匿名]

回覆: 2

2016-03-28 5:23 am

how many formula units make up 22.2g of MgCl2?

[匿名]

回覆: 2

2016-03-22 2:14 pm

有一個邊長3/5公尺的正方體，在加多少個1立方公分體積就會和1立方公尺一樣大?

[匿名]

回覆: 6

2016-03-22 11:52 am

why sodium hydroxide is not a primary standard?

[匿名]

回覆: 6

2016-03-15 2:26 pm

Solve the inequality graphically: 7^x > 3^x?

[匿名]

回覆: 1

2016-03-04 4:56 am

The heat of combustion for heptane is 48.1 kJ/g.?

[匿名]

回覆: 2

2016-03-04 5:30 am

Chemistry help with gas laws??

[匿名]

回覆: 1

2016-03-03 3:33 pm

化學平衡(新平衡)?

[匿名]

回覆: 1

2016-03-02 4:15 pm

Iron (III) oxide solid and gaseous carbon monoxide yield iron solid and carbon dioxide gas?

[匿名]

回覆: 1

2016-03-02 4:14 pm

Solid calcium carbonate and aqueous hydrogen phosphate will yield aqueous calcium phosphate, gaseous carbon dioxide, and liquid water?

[匿名]

回覆: 1

2016-03-02 4:07 pm

If two angles are supplementary and one of the angles measures 62°, what is the measure of the other angle?

[匿名]

回覆: 1

2016-03-02 3:54 pm

Need help in algebra?

[匿名]

回覆: 1

2016-03-02 3:14 pm

Calculate pH of a solution?

[匿名]

回覆: 1

2016-03-02 3:36 pm

1 mol of oxygen is heated at constant pressure of 1.00 atm from 10.0°C to 25.0°C. What is the change of volume of the gas in this process?

[匿名]

回覆: 1

2016-03-02 3:33 pm

What are the slopes/gradients of the following. a) y=3x+4 b) 3x+4y=6?

[匿名]

回覆: 3

2016-03-02 3:23 pm

can anyone factorise this 3x²-9x working out please?

[匿名]

回覆: 3

2016-03-02 3:10 pm

Proove that if x is a positive real number then [(x+1)/(x+2)]<[(x+3)/(x+4)]?

[匿名]

回覆: 1

2016-03-02 3:05 pm

Calculus Question?

[匿名]

回覆: 5

2016-03-02 3:04 pm

1/2 +7/8 =?

聰明羊

回覆: 1

2016-03-02 5:36 am

Make a substitution to express the integrand as a rational function, and then evaluate: ∫ dx/(x+2)√(x−1)?

聰明羊

回覆: 1

2016-03-02 5:21 am

Write the form of the partial fraction decomposition. Do not determine the values of the coefficients a) x−2/x^3+2x^2+x b) x^3/(x^2−9)(x^2+9)?

聰明羊

回覆: 1

2016-03-02 5:29 am

Evaluate the integral ∫(1 to 0) xdx/[(x+a)(x+b)], a,b > 0, a ≠ b.?

mandy

回覆: 1

2016-02-18 1:15 pm

probability?

mandy

回覆: 1

2016-02-18 1:40 pm

PROBABILITY PART 5-_-?

[匿名]

回覆: 1

2016-02-18 2:07 pm

國中數學座標平面題目~三題~?

justin

回覆: 2

2016-02-14 11:05 am

true bearing and compass bearing 點分?

Kis

回覆: 1

2016-02-14 8:04 am

已知甲、乙、丙身上的錢皆為完全平方數，且甲身上的錢恰為其他兩人的錢數和在多72元，若乙與丙身上的錢數的差為65元，則三人共有多少錢?

[匿名]

回覆: 1

2016-02-11 2:47 pm

請問dT除與T^2,答案為? 如何計算?

[匿名]

回覆: 2

2016-02-09 10:55 am

已知"#"為一個新的運算符號，且定一其運算規則為"a#b=-(a^2-b)/a"。 第一題:2#(-4)=? 第二題:(-3)#(-2)=? 求詳細解答 謝謝><?

[匿名]

回覆: 1

2016-02-01 5:05 pm

我們是做計件的比如做了12件每件有4公斤做出來的廢品有0.5公斤要算出廢品佔了千分之幾怎麼算? 麻煩把算式直白化謝謝!最好能有中文解釋算式!謝謝!?

[匿名]

回覆: 1

2016-01-27 2:51 am

請問一下，氧化鎂要如何分解成氧和鎂。?

[匿名]

回覆: 1

2016-01-20 4:25 am

Math problem. FInd f'(x) with full solution thanks?

[匿名]

回覆: 2

2016-01-20 4:27 am

Find slope. with full solution . thanks?

[匿名]

回覆: 1

2016-01-05 5:44 am

請各位幫幫忙 雙氧水測定 樣本 : 2ml 的未知濃度的雙氧水 以0.02N的KMnO4去滴定 , 得出滴定量為10ml 請問 : (1) 雙氧水濃度為多少 (N)? (2)換成(g/L)是多少?

[匿名]

回覆: 2

2015-12-21 11:57 pm

想請問大家 陽離子是否都是酸性的? 陰離子是否都是鹼性的? 若不是那陰陽離子和酸鹼是否有什麼關聯呢? 謝謝~~?

Kwok Ho

回覆: 1

2015-12-19 5:59 am

計算化學式的問題 答案是K2S(s)+N2(g)+3CO2 (g) 我是知的是答案如何求出來?

[匿名]

回覆: 1

2015-12-07 4:16 pm

Friedel-Crafts是什麼?

[匿名]

回覆: 1

2015-11-29 10:47 am

我有一個問題，可以請各位幫忙解答一下嗎。如下， 有一瓶硫酸密度1.4g/cm3,重量百分濃度為百分之七十，則體積莫耳濃度為多少M?

[匿名]

回覆: 1

2015-11-09 12:44 pm

如何計算BCC單位的堆積因子??