胡雪8°

[匿名]

回覆: 2

2017-11-01 9:00 am

I need help with a chemistry problem.?

[匿名]

回覆: 2

2017-10-31 10:29 pm

Chemistry: these mammals can descend to depths of nearly 3000 m what is the depth in kilometers?

[匿名]

回覆: 4

2017-10-31 5:33 pm

Is CO2 organic or inorganic molecule ? Why ?

[匿名]

回覆: 1

2017-10-31 10:40 am

Using the combined gas law, calculate the the volume, in mL, at STP of a gas that has a volume of 150.0 mL at 1.20 atm and 293 K.?

[匿名]

回覆: 1

2017-10-31 10:44 am

How many moles of pure Na2CO3 were there in the sample?

[匿名]

回覆: 1

2017-10-31 10:45 am

What was the percent of pure Na2CO3 in the sample?

[匿名]

回覆: 2

2017-10-31 12:55 am

Give à chemical name à monatomic gas?

[匿名]

回覆: 1

2017-10-30 10:05 am

What is the mass of O2(g) consumed in the combustion of 21.5 g cyclohexane, C6H12 to form CO2(g) and H2O(g)?

[匿名]

回覆: 1

2017-10-30 12:25 pm

For the diprotic weak acid H2A, Ka1 = 2.9 × 10-6 and Ka2 = 7.9 × 10-9. What is the pH of a 0.0750 M solution of H2A?

[匿名]

回覆: 1

2017-10-30 11:05 am

If 5.0 moles of ammonia is produced then the number of hydrogen molecules consumed is? N2+3H2--->2NH3?

[匿名]

回覆: 1

2017-10-30 9:35 am

In a voltaic cell can hydrogen be the electrode at the cathode or anode?

[匿名]

回覆: 1

2017-10-30 1:10 am

What is the final concentration of 18.1 mL iron(III) chloride sol with an intl conc of 1.89M which is diluted with 15.7mL of solvent?

[匿名]

回覆: 4

2017-10-29 4:53 pm

Make F the subject. C=5 (F-32)/9 give answer in form aC+b/c where a,b,c are all positive integers.help?

[匿名]

回覆: 2

2017-10-29 5:18 pm

What is the molar mass, in g mol^1, of MgSO4x7H2O (please explain steps)?

[匿名]

回覆: 2

2017-10-26 5:01 pm

what is functional group of carboxylic acid?

[匿名]

回覆: 2

2017-10-25 12:29 pm

Calculate the pH of a 6.00×10-1 M aqueous solution of ammonium chloride (NH4Cl). (For ammonia, NH3, Kb = 1.80×10-5.)?

[匿名]

回覆: 2

2017-10-25 10:43 am

How many moles are equal to 93.75g of Sodium Sulfate (Na2SO4)?

[匿名]

回覆: 1

2017-10-25 10:01 am

Chemistry question?

[匿名]

回覆: 1

2017-10-24 6:36 pm

When Na3PO4 and Ca(NO3)2 are combined, the following reaction occurs: 2PO4 + 3Ca -> Ca3(PO4)2?

[匿名]

回覆: 2

2017-10-24 11:55 am

What is the mass of one mole of atoms in these 3 compounds?

[匿名]

回覆: 1

2017-10-24 1:03 am

Products and net ionic equation for the reaction : Al(NO3)3 + NH3 + H2O -->?

[匿名]

回覆: 1

2017-10-23 2:34 pm

Quick Chemistry question please help.?

[匿名]

回覆: 3

2017-10-23 11:07 am

If 990. mL of water is added to 10.0 mL of 0.10 M HCl, what is the pH of the resultant solution?

[匿名]

回覆: 1

2017-10-22 8:21 pm

Using average bond enthalpies (linked above), estimate the enthalpy change for the following reaction: 4NH3(g) + 5O2(g)4NO(g) + 6H2O(g)?

[匿名]

回覆: 1

2017-10-22 8:21 pm

Using average bond enthalpies (linked above), estimate the enthalpy change for the following reaction: H2(g) + F2(g)2HF(g)?

[匿名]

回覆: 1

2017-10-22 4:39 pm

Math needs at once?

[匿名]

回覆: 1

2017-10-20 11:00 pm

Initial rate of the reaction PCl5-->PCl3 + Cl2 is increased by a factor of 4 when concentration of PCl5 is doubled, therefore the rate is?

[匿名]

回覆: 2

2017-10-20 2:52 pm

Give five ways of increasing the rate of the following reaction: H2(g)+Br2(g) -> 2HBr(g)?

[匿名]

回覆: 1

2017-10-20 9:23 am

What mass of potassium chloride forms when 5.11 L of chlorine gas at 0.943 atm and 286 K reacts with 29.0 g potassium?

[匿名]

回覆: 1

2017-10-19 12:13 am

How many ml of 1.00M HCl do I need to add to 10.0ml of 1.00M NaOH to get a solution with pH = 1?

[匿名]

回覆: 1

2017-10-18 2:19 pm

The indium (II) ion and indium (III) ion?

[匿名]

回覆: 1

2017-10-18 12:05 pm

Chemistry heat change?

[匿名]

回覆: 1

2017-10-18 10:56 am

Calculate the heat change in calories for condensation of 18.0 g of steam at 100∘C.?

[匿名]

回覆: 2

2017-10-18 8:39 am

Assign oxidation numbers to, 3Mg(s) + N2(g) = Mg3N2(s)?

[匿名]

回覆: 2

2017-10-17 10:05 pm

Please solve ques no 3?

[匿名]

回覆: 1

2017-10-17 5:19 pm

Geometry help please! Thank you!?

[匿名]

回覆: 1

2017-10-17 1:06 pm

Chemistry help?

[匿名]

回覆: 2

2017-10-16 4:28 pm

Hard titration chemistry questions. Please help!?

[匿名]

回覆: 1

2017-10-14 12:52 am

Help with physics thanks?

[匿名]

回覆: 1

2017-10-13 12:54 pm

If a 1.0L flask is filled with 450 torr of SiH4 gas at 20 °C, what is the mass of SiH4 in the flask?

[匿名]

回覆: 2

2017-10-12 12:19 am

CHEM HELP?

[匿名]

回覆: 3

2017-10-11 1:46 pm

For the reaction, calculate how many grams of the product form when 3.4 g of Cl2completely reacts.?

[匿名]

回覆: 1

2017-10-09 9:13 pm

what volume in liters of h2 gas is produced at 1.25 atm and 58 c when 85 grams of CaH2 are reacted with 100 grams h2o?

[匿名]

回覆: 1

2017-10-09 2:37 pm

the H+ Concentration in a 1.0 molar solution of HCN IS 2X10 -5 Oles/dm3.what is the value for Ka for HCN?

[匿名]

回覆: 2

2017-10-08 11:19 pm

Balance these reactions and please show how you did it: c) NO + H2 → NH3 + H2O (d) H2 + O2 → H2O (e) Al + O2 → Al2O3?

[匿名]

回覆: 2

2017-10-06 9:47 pm

A water sample is suspected to be contaminated by PO4 ions. How could you know if the sample is really contaminated?

[匿名]

回覆: 1

2017-10-06 12:52 pm

Chem help equations?

[匿名]

回覆: 1

2017-10-04 1:57 am

If you add aqueous ammonia to AgCl+NaNO3 What is the balanced equation?

[匿名]

回覆: 2

2017-10-03 4:56 pm

Ionization potential decreses ftom Li to Cs?

[匿名]

回覆: 5

2017-10-03 1:40 am

the probability that in a family of 3 children, there will be at least one boy, is (a) 1/7 (b) 1/8, (c) 3/8 (d) 7/8?