david

[匿名]

回覆: 2

2017-10-02 12:27 am

4NH3+7O2->4NO2+6H2O If [No2] is changing at a rate of 2.0mole/L second what rate is [NH3] changing at?

[匿名]

回覆: 3

2017-09-15 12:53 pm

can two atoms of the same element form ionic bonds, covalent bonds, or both?

[匿名]

回覆: 2

2017-09-15 10:27 am

how do two atoms form an ionic bond how do two atoms form a covalent bond?

[匿名]

回覆: 2

2017-08-30 9:21 am

If water is added to 28.43mL of a 12.63M Ca(NO3)2solution to make150mL of solution, then what is the final concentration of calcium nitrate?

[匿名]

回覆: 15

2017-08-29 10:48 am

Why is it that most people tend to be more conservative as they get older?

[匿名]

回覆: 3

2017-07-18 1:31 am

Suppose a piece of silver jewelry contains 7.74×1022 atoms of silver (Ag) How many moles of silver atoms are in the piece of jewelry?

[匿名]

回覆: 3

2017-07-18 12:58 am

Explain what type of bond an atom with 2 electrons (NOT Helium) in its outermost shell will form.?

[匿名]

回覆: 2

2017-06-26 12:57 am

What is the pH of 0.050 M benzoic acid (Ka = 6.6 × 10^–5) is titrated with 0.05 M NaOH? Can you show me how to find the pH please?

[匿名]

回覆: 4

2017-06-21 1:09 pm

Why did I USED to be good at math?

[匿名]

回覆: 3

2017-06-04 3:02 pm

what is federal income tax ?

[匿名]

回覆: 2

2017-06-04 8:08 am

Please help me with this Geometry?

[匿名]

回覆: 2

2017-05-28 9:24 pm

Chemical formula question?

[匿名]

回覆: 2

2017-05-17 2:31 pm

chemical equation of propane , C3H8+5O2 -->3CO2+4H2O How many grams of O2(g) are needed to completely burn 62.0 g of C3H8(g)?

[匿名]

回覆: 3

2017-05-16 5:58 am

A sample of nitrogen gas has 2.68 x 10^22 molecules measured at 87.0 degrees C and 0.620 atm. What is it's volume?

[匿名]

回覆: 9

2017-05-11 7:18 am

How many times do you suppose to knock on a door?

[匿名]

回覆: 2

2017-04-15 2:47 pm

Can someone help me with these Chemistry Problems? Write equilibrium expressions for the following reactions [...] denotes subscript?

[匿名]

回覆: 2

2017-04-05 4:04 pm

Estimate the charge on 46g of Na+?

[匿名]

回覆: 2

2017-02-19 10:06 am

Why should you base your choice of what compound is the limiting reactant on its number of initial moles, not on its initial mass in grams?

[匿名]

回覆: 1

2017-02-17 7:44 pm

Does impurities cause a substance to have no fixed boiling points? Does it also cause substances to take a longer time to boil?

[匿名]

回覆: 1

2017-02-16 8:13 pm

Find all roots of the polynomial equation f(x)= x^3+x+10 (study guide practice question)?

[匿名]

回覆: 4

2017-02-03 4:03 pm

What is 0.116 with the 16 repeating as an fraction?

[匿名]

回覆: 2

2017-01-24 11:43 pm

iron with a mass of 25 grams is dropped into 100 grams of water. the change in temperature is 72. What is the temp change in the water?

[匿名]

回覆: 2

2017-01-21 1:11 am

Help with chemistry?

[匿名]

回覆: 2

2017-01-11 10:39 am

you need 0.0100 mole of lead (2) chromate. How mush should you weigh on the scale?

[匿名]

回覆: 4

2017-01-11 10:08 am

why is it impossible to have a sample of methene?

[匿名]

回覆: 4

2017-01-11 12:49 am

A radioactive isotope has a half-life of 173 days. How much of a sample of 100 grams of the isotope would remain after 732 days?

[匿名]

回覆: 4

2017-01-11 12:42 am

A student placed 16.5 g of glucose (C6H12O6) in a volumetric flask?

[匿名]

回覆: 1

2016-12-19 10:28 am

How many grams of Oxygen are in 152.21grams of CO2?

[匿名]

回覆: 7

2016-11-06 3:40 am

Why 0÷0 is math error? Ain't the answer 0? I know all numbers cannot be divided by 0, but...why? Whywhywhy?

[匿名]

回覆: 2

2016-10-14 5:39 pm

Calculate molarity of the following solution?

[匿名]

回覆: 4

2016-10-10 2:30 pm

Credit to trump?

[匿名]

回覆: 8

2016-08-04 11:02 pm

who will win Trump or Hillary?

[匿名]

回覆: 2

2016-08-02 4:07 pm

what is the fina equilibrium temperature when 40.0 grams of ice at 0°c is mixed with 5.00grams of stream at 120°c?

[匿名]

回覆: 8

2016-08-01 3:29 pm

In periodic table why blocks are named as s p d f?

[匿名]

回覆: 7

2016-07-30 10:21 am

what is the product of this reaction?CH3CH2CH=CHCH3+CL2?

[匿名]

回覆: 2

2016-07-20 7:23 am

what happens when carbon disulphide is added to the mixture of heated iron filings and sulphur?

[匿名]

回覆: 2

2016-07-15 5:18 pm

why co co2 carbonates and bcarbonates are not organic?

[匿名]

回覆: 5

2016-07-13 9:16 am

How would I solve this basic algebra equation?

[匿名]

回覆: 2

2016-07-12 5:23 pm

Chemistry moles help please?

[匿名]

回覆: 4

2016-07-08 2:55 pm

Prove that for any integers m and n, if m is odd and n is odd, then mn is odd.?

[匿名]

回覆: 4

2016-07-06 9:20 pm

Chemistry question (limiting reagent).?

[匿名]

回覆: 2

2016-07-05 5:02 pm

What mass of sulfur should be burned to produce 64.0 tonnes of sulfur dioxide?

[匿名]

回覆: 3

2016-07-05 4:34 pm

what is the specific gravity of the new solution?

[匿名]

回覆: 3

2016-06-30 11:29 am

H2S + SO2 = H2O + S help balancing?

[匿名]

回覆: 5

2016-06-30 11:32 am

Why all alkenes are hydrocarbons?

[匿名]

回覆: 2

2016-06-24 5:18 am

How many grams of hydrogen (H2) are required to produce 81.6g of NH3?

[匿名]

回覆: 2

2016-06-24 6:12 am

Need help with the following problems thanks. Charles' and Boyle's law.?

[匿名]

回覆: 2

2016-06-22 6:24 pm

Why did the chemical reaction stop?

[匿名]

回覆: 2

2016-06-22 3:36 pm

Chemistry - Chemical Bonds Question?

[匿名]

回覆: 2

2016-06-21 9:09 am

Write the chemical equation of mixing hydrogen nitrate (HNO3) with water and what is the conjugate acid and conjugate base? HELP PLEASE!?