戇戇居士

[匿名]

回覆: 1

2016-11-02 5:07 am

concentration of the final solution? Chemistry question?

[匿名]

回覆: 1

2016-11-02 4:03 am

Help! Could someone please explain how to solve.?

[匿名]

回覆: 1

2016-11-02 3:37 am

How many grams (to the nearest 0.01 g) of NH4Cl (Mm = 53.49 g/mol) must be added to 800. mL of 1.202-M solution?

[匿名]

回覆: 1

2016-11-01 2:56 pm

Help in Chemistry?

[匿名]

回覆: 1

2016-10-26 5:21 pm

You need to make an aqueous solution of 0.182 M chromium(III) nitrate for an experiment in lab, using a 500 mL volumetric flask.?

[匿名]

回覆: 1

2016-10-26 5:49 am

IUPAC name of [Mn(CO)5]+?

[匿名]

回覆: 1

2016-10-24 6:06 pm

Net Ionic Equations help?!?

[匿名]

回覆: 2

2016-10-24 4:30 am

An aqueous solution of barium hydroxide is standardized by titration with a 0.128 M solution of hydroiodic acid.?

[匿名]

回覆: 1

2016-10-24 8:14 am

K2SO4 is a strong electrolyte. Determine the concentration of the ions in a 0.250 M K2SO4 solution. [K+]= ____ M [SO4 2-]=___ M?

[匿名]

回覆: 1

2016-10-24 7:07 am

What was the concentration of the HNO3 solution?

[匿名]

回覆: 1

2016-10-24 5:22 am

If the mass ratio of K to F in a compound is 2.06:1, how many grams of F are needed to react with 97.5 g of K?

[匿名]

回覆: 1

2016-10-24 3:18 am

50mL of .1M HCl, how many moles H3O+?

[匿名]

回覆: 2

2016-10-21 4:01 pm

Calculate the number of moles in 20g CaCO3?

[匿名]

回覆: 1

2016-10-21 1:14 am

is reactivity the physical property?

[匿名]

回覆: 3

2016-10-21 5:47 am

What's the chemical formula for Tin(1) Sulfide?

[匿名]

回覆: 3

2016-10-21 4:31 am

Which of the following equations does not represent a redox reaction? Is my answer correct?

[匿名]

回覆: 1

2016-10-19 4:16 pm

What mass of precipitate forms when 200.00 mL of 0.500 M NaCl is added to 650 mL of a solution that contains 15.5 g of silver sulfate?

[匿名]

回覆: 1

2016-10-18 5:53 am

農曆77年9月21日晨3時41分生的八字有多種呢?

[匿名]

回覆: 2

2016-10-18 5:59 am

請問大大農曆77年9月21日晨3時41分生的八字有多重呢? 感謝?

[匿名]

回覆: 1

2016-10-19 8:08 am

why do amines act as a base but amides do not?

[匿名]

回覆: 1

2016-10-19 6:56 am

Two gases NO & O2 were introduced at the twoends of a 1m long tube simultaneously.At what distance from NO gas end, Brownfumes will be seen?

[匿名]

回覆: 1

2016-10-19 6:24 am

Two gases NO & O2 were introduced at the twoends of a 1m long tube simultaneously.At what distance from NO gas end, Brownfumes will be seen?

[匿名]

回覆: 1

2016-10-18 3:34 pm

hi please help with my chemistry?

[匿名]

回覆: 1

2016-10-18 1:59 pm

Select the equation below that gives the correct relationship between the internal pressure of a gas and the volume of a flexible container?

[匿名]

回覆: 2

2016-10-18 8:49 am

Chemistry?

[匿名]

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2016-10-18 5:36 am

Chemistry help!! Write the equation for calcium oxide is warmed gently in sulfur trioxide gas.?

[匿名]

回覆: 2

2016-10-18 2:40 am

How much energy in kJ/mole are given off by hydrogen atoms if an electron falls from the n = 10 state to the n = 3 state?

[匿名]

回覆: 2

2016-10-17 5:45 pm

HELP!!!! CHEM HOMEWORK! Consider the balanced chemical reaction shown below. 1 Ca3P2(s) + 6 H2O(l) 3 Ca(OH)2(s) + 2 PH3(g)?

[匿名]

回覆: 1

2016-10-16 4:44 pm

Hard Chemistry Titration Calculations Question! Help?

[匿名]

回覆: 1

2016-10-16 6:18 am

In which of the following compounds does the charge cloud arrangement match the molecular shape? 1.PI3 2.SiF4 3 BeCl2 4.H2O 5.BBr3?

[匿名]

回覆: 2

2016-10-14 6:21 pm

If you have 0.132g of NO2 at a pressure of 100kPa and a temperature of 25 Degrees Celsius, what is the volume in dm^3?? Chem a level help?

[匿名]

回覆: 1

2016-10-14 3:42 pm

Temperature of gas?

[匿名]

回覆: 2

2016-10-14 6:42 am

What is Hydrogen s oxidation number if combined with both a metal and a non metal?

[匿名]

回覆: 1

2016-10-13 6:11 pm

A 9.25-L container holds a mixture of two gases at 13 °C. Help PLEASE!?

[匿名]

回覆: 2

2016-10-11 5:52 pm

Please help 16g of methane reacts with 64g of oxygen to give 36g of water. Calculate the mass of carbon dioxide produced.?

[匿名]

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2016-10-06 9:31 am

what is the loss in the mass when 1.25 g of blue copper(II) sulphate crystals is heated and decomposed to anhydrous copper (II) sulphate?

[匿名]

回覆: 6

2016-10-05 5:57 pm

Please explain why x^2 • -x^-2 = -1?

[匿名]

回覆: 1

2016-10-05 5:48 am

Write Structural Formula for organic product formed in the reaction of methyl bromide with NaOH.?

[匿名]

回覆: 1

2016-10-03 1:29 pm

What mass of silver chloride can be produced from 1.73 L of a 0.174 M solution of silver nitrate?

You'll miss sunrise, if you close your eyes

回覆: 1

2016-10-03 5:03 am

basic chemistry question?

[匿名]

回覆: 1

2016-10-02 6:33 pm

What are the oxidation numbers of Al(OH)4^-?

[匿名]

回覆: 5

2016-10-01 10:58 am

What is the molecular shape for BrF4+?

[匿名]

回覆: 1

2016-09-29 5:00 pm

What is the pH of a solution that contains 0.045 moles of NH4+ and 0.0090 moles of NH3? The pKa of ammonia is 9.25. Need help with process..?

[匿名]

回覆: 8

2016-09-13 4:03 pm

A number divided by 2 is equal to 12 less than the original number what is the number?

Yip

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2016-09-10 2:10 pm

F5 Mathematics?

[匿名]

回覆: 1

2016-08-24 7:49 am

Physics help?

[匿名]

回覆: 1

2016-08-05 3:19 am

Chemistry help???!!?

[匿名]

回覆: 3

2016-08-03 6:24 pm

A ball is thrown upward and reaches a height of 3 meters. What is the initial velocity of the ball and the time to reach the 3 meters?

[匿名]

回覆: 3

2016-08-03 7:02 am

Let x ◦ y = (x − 2y)2 for all integers x and y. Which of the following is the value of 5 ◦ (−3)?

[匿名]

回覆: 1

2016-08-03 5:03 am

mixture of co2 n co is passed over red hot graphite when 1 mole of mixture changes to 33.6l(stp)the mole fraction of co2 in the mixture is?