不用客氣

[匿名]

回覆: 1

2017-11-10 1:48 pm

chem question?

[匿名]

回覆: 1

2017-11-10 10:16 am

RbCl(aq) and LiC2H3O2(aq). If a solid forms when solutions containing these salts are mixed, write the net ionic equation?

[匿名]

回覆: 2

2017-11-09 3:21 pm

an excited electron falls to ground state emitting orange light. and even more excited electron falls. what color will not be exhibited, why?

[匿名]

回覆: 2

2017-11-09 12:03 am

How many moles of H2O2 are needed to produce 4 moles of O2.?

[匿名]

回覆: 1

2017-11-08 1:45 pm

Chemistry Question?

[匿名]

回覆: 1

2017-11-08 1:07 pm

Nernst Equation Applied to Half-Reactions?

[匿名]

回覆: 1

2017-11-08 9:54 am

Complete and balance the neutralization reaction, name the products, and write the net ionic equation CH3COOH(aq)+Sr(OH)2(aq)-->?

[匿名]

回覆: 1

2017-11-07 8:59 pm

A sample of oxygen gas collected at a pressure of 1.20 atm and a temperature of 304 K is found to occupy a volume of 761 milliliters. How m?

[匿名]

回覆: 1

2017-11-07 6:05 pm

Using the equation 2KOH = K2O + H2O, what is the amount of water in grams formed if 45.6 grams KOH are used?

[匿名]

回覆: 2

2017-11-07 10:16 am

Place the following gases in order of increasing average molecular speed at 25 °C: CHCl3, SF6, Xe, CCl2F2.?

[匿名]

回覆: 2

2017-11-06 12:57 pm

If a combustion reaction of sucrose has a calorie content of 3.87 kcal/gram what is the ∆H? I can't find how to do this anywhere!?

[匿名]

回覆: 4

2017-11-06 6:28 pm

Calculate the mass of 1.23 x 10^24 helium atoms?

[匿名]

回覆: 1

2017-11-06 2:09 pm

What is the mass of potassium iodide (166.00 g/mol) that yields 0.500g of lead (II) iodide (461.0 g/mol) precipitate?

[匿名]

回覆: 1

2017-11-06 12:36 pm

Calculate the pH?

[匿名]

回覆: 3

2017-11-06 11:07 am

Need Help please?

[匿名]

回覆: 2

2017-11-05 11:51 pm

Which of the following would not make a suitable buffer pair?

[匿名]

回覆: 3

2017-11-05 2:25 pm

Very quick chemistry question!!!! Please help.?

[匿名]

回覆: 1

2017-11-05 1:55 pm

Very confusing chemistry question please help!!! I'm begging you.?

[匿名]

回覆: 3

2017-11-05 4:18 am

What is the molar mass of a 4.10 g sample of gas exerting 1.35 atm of pressure at 325K in a 5.00 L container?

[匿名]

回覆: 1

2017-11-04 8:28 pm

Mechanics Q: A particle starts from rest and moves in a straight line with constant acceleration. The rest of the Q is below.?

[匿名]

回覆: 1

2017-11-04 12:13 pm

If 1.40 g of steam at 100.0 ∘C condenses into 40.0 g of water initially at 25.0 ∘C, in an insulated container what is the final temperature?

[匿名]

回覆: 1

2017-11-01 1:45 pm

Suppose 0.508 g of a gas occupies a volume of 0.175 L at a temperature of 25.0◦C is held at a pressure of 1.0 atm. What gas is this?

[匿名]

回覆: 2

2017-11-01 11:20 am

S8 is not a flat octagon - Why?

[匿名]

回覆: 1

2017-11-01 9:43 am

Bonds in Chem?

[匿名]

回覆: 1

2017-11-01 8:35 am

Determine what mass of iron (II) sulfate heptahydrate is required to make 100mL of a solution that contains 20mg of iron?

[匿名]

回覆: 5

2017-10-31 9:15 pm

what is acid?

[匿名]

回覆: 1

2017-10-31 4:02 pm

Confusing chem question?

[匿名]

回覆: 2

2017-10-31 3:43 pm

what is the number of protons, neutrons, and electrons of 2H and how do you calculate it?

[匿名]

回覆: 3

2017-10-31 3:31 pm

number of protons, neutrons, and electrons?

[匿名]

回覆: 1

2017-10-31 11:46 am

If the heat of combustion for a specific compound is -1230.0 kJ/mol?

[匿名]

回覆: 1

2017-10-31 10:01 am

Write an equation for the preparation of copper(II) nitrate using an acid-base neutralization reaction. Include states in your answer.?

[匿名]

回覆: 1

2017-10-30 7:16 pm

synthesis of aspirin .. organic chemistry lab question?

[匿名]

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2017-10-30 1:27 pm

0.209 g of a gas occupies 186.6 mL at STP. What is its molecular weight?

[匿名]

回覆: 1

2017-10-30 11:43 am

hi can anyone help me with this please?

[匿名]

回覆: 1

2017-10-30 9:53 am

How many moles of carbon dioxide do you think would be formed from 4.0 mol of sodium hydrogen carbonate?

[匿名]

回覆: 1

2017-10-30 9:08 am

The solubility product for an insoluble salt with the formula M2X3 is written as ________, where s is the molar solubility. Please help!?

[匿名]

回覆: 1

2017-10-30 12:30 am

Find the half reactions for this redox?

[匿名]

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2017-10-29 11:14 pm

Copper oxide + carbon----> copper+ carbon dioxide Balanced equation for this ______ Cuo+_______-----> 2Cu+_____?

[匿名]

回覆: 1

2017-10-29 1:10 pm

Please help me with this chemistry question.?

[匿名]

回覆: 1

2017-10-26 12:37 am

The lower the intramolecular interactions, the greater the solubility of the compound in water.?

[匿名]

回覆: 1

2017-10-25 11:04 am

Net Ionic Equation?

[匿名]

回覆: 2

2017-10-25 10:19 am

Zinc metal reacts with hydrochloric acid according to this balanced equation. Zn(s)+2HCl(aq)→ZnCl2(aq)+H2(g)?

[匿名]

回覆: 2

2017-10-25 9:09 am

Write an equation for the formation of glucose from its elements (in their standard states). Express your answer as a chemical equation.?

[匿名]

回覆: 3

2017-10-24 11:24 am

What gas is present when combining CuSO4+ Zn?

[匿名]

回覆: 2

2017-10-24 9:33 am

When 6.58 grams of NH4Cl is dissolved in 100g of water, how many moles of cation are produced?

[匿名]

回覆: 1

2017-10-23 7:42 pm

Please help me to solve this isomerism problem of chemistry.I am just stuck in between c and d option.?

[匿名]

回覆: 1

2017-10-23 12:28 pm

Chemistry homework help?

[匿名]

回覆: 2

2017-10-22 11:02 pm

geometric series?! MATH!?

[匿名]

回覆: 1

2017-10-22 12:39 pm

Partition Coefficient? HELP!!?

[匿名]

回覆: 1

2017-10-22 3:16 pm

1_chlorobutane with sodium ethoxide equation?