胡雪8°

[匿名]

回覆: 3

2019-03-13 9:17 am

what is the height of the building if the 1st angle of elevation is 50 degrees & the 2nd is 28 degrees were taken at distance 100 feet apart?

[匿名]

回覆: 1

2019-03-13 3:17 am

The synthesis of ammonia from nitrogen and hydrogen is reversible and exothermic: _N2 + _H2 <--> ¬_NH3?

[匿名]

回覆: 3

2019-03-13 8:04 am

College Algebra...Quadratic equations...help!?

[匿名]

回覆: 1

2019-03-13 5:04 am

At a certain temperature, the Kp for the decomposition of H2S is 0.814 atm. EASY 10 PTS?

[匿名]

回覆: 1

2019-03-12 3:02 pm

Activation energy = ___ kJ/mol?

[匿名]

回覆: 2

2019-03-09 11:24 am

請問一下1000 ppm的HCl中 Cl離子有幾ppm?

[匿名]

回覆: 1

2019-03-12 1:38 pm

請問folin試劑的分子量多少，我看到有94也有260多?

[匿名]

回覆: 1

2019-03-10 12:45 am

Probability with Replacement help!?

[匿名]

回覆: 4

2019-03-09 9:35 pm

Help with the first maths question pls? I got 3/4.?

[匿名]

回覆: 4

2019-03-09 4:21 pm

Electricity: Electric Circuits please show work~?

[匿名]

回覆: 3

2019-03-09 3:34 pm

calculate the wavelength of the Lyman line of the hydrogen spectrum in which yhe innitial quantum number,n is 5.?

[匿名]

回覆: 1

2019-03-09 1:12 pm

Chemistry Question. Please Help?

[匿名]

回覆: 2

2019-03-09 1:13 pm

Chemistry Question?

[匿名]

回覆: 1

2019-03-09 2:07 am

What will be Kc for the reaction between A and B?

[匿名]

回覆: 2

2019-03-09 1:22 am

What is the oxidation number of N in NH4(H2PO4)?

[匿名]

回覆: 1

2019-03-09 1:37 am

Math question: What is the maximum value and when does it occur?

[匿名]

回覆: 1

2019-03-09 1:26 am

Chemistry Help?

[匿名]

回覆: 1

2019-03-08 4:39 pm

Chemistry question?

[匿名]

回覆: 3

2019-03-08 1:43 pm

Casey can peel k apples in 10 minutes. In terms of k, how many apples can casey peel in m minutes. In terms of k how many minutes to peel 1?

[匿名]

回覆: 3

2019-03-08 11:54 am

A 100-g aluminum calorimeter contains 500 g of water at a temperature of 20ºC.?

[匿名]

回覆: 2

2019-03-08 5:56 am

what would be the word equation for " 2Na3PO4 + 3MgCl2 == 6NaCI + Mg3(PO4)2?

[匿名]

回覆: 1

2019-03-08 7:46 am

Help why an a concentration of FeSCN^2+ can be assumed to be equal to that of the initial SCN- concentration.?

[匿名]

回覆: 1

2019-03-07 2:01 am

What is the pH of a solution containing 1.396 mol L-1 of a weak acid with pKA = 8.39 a?

[匿名]

回覆: 1

2019-03-07 12:05 am

What is the pH of a solution containing 1.396 mol L-1 of a weak acid with pKA = 8.39 and 0.506 mol L-1 of another weak acid with pKA = 4.70?

[匿名]

回覆: 1

2019-03-07 12:19 am

Calculate the equilibrium concentration of H2O in the second mixture at this temperature.?

[匿名]

回覆: 1

2019-03-07 12:20 am

Consider a weak base "B". What is the pH of a 0.118 mol L-1 solution of B? The KB of B is 5.14 x 10-7?

[匿名]

回覆: 1

2019-03-07 12:06 am

Chemistry question?

[匿名]

回覆: 2

2019-03-06 11:56 pm

Calculate the volume of each gas sample at STP: 23.2 mol Cl2, 4.6 mol nitrogen, 3.2 mol helium, 29 mol CH4? (Liters)?

[匿名]

回覆: 1

2019-03-06 6:58 pm

CHEMISTRY CONCENTRATION NEUTRALISATION?

[匿名]

回覆: 1

2019-03-06 7:02 pm

TITRATION QUESTION?

[匿名]

回覆: 2

2019-03-06 4:15 pm

Math: How to find h in the picture?

[匿名]

回覆: 1

2019-03-06 2:42 pm

What is the specific heat (SH) of the substance?

[匿名]

回覆: 1

2019-03-06 11:33 am

Chem 20 help please!?

[匿名]

回覆: 3

2019-03-06 11:51 am

Write the net ionic equation for the hydrolysis of hydrocyanic acid, HCN(aq)?

[匿名]

回覆: 1

2019-03-06 12:22 pm

first order rate law decomposition?

[匿名]

回覆: 1

2019-03-06 11:36 am

A 25.07 g sample of a substance is initially at 23.8 °C.?

[匿名]

回覆: 1

2019-03-06 10:58 am

The rate laws for the thermal and photochemical decomposition of NO2 are different.?

[匿名]

回覆: 2

2019-03-06 10:59 am

Calculate the equilibrium concentration of B2(g) in a vessel that initially contains 1.00 M AB(g). 2AB(g) <--> A2(g) + B2(g) kc=4.0a?

[匿名]

回覆: 2

2019-03-06 10:38 am

What is the electronic configuration for the following elements? Zn: Na+:?

[匿名]

回覆: 1

2019-03-06 9:58 am

Chemistry, How would you approach 3?

[匿名]

回覆: 2

2019-03-06 10:10 am

A sample of oxygen gas occupies a volume of 350 cm3 at 840 torr pressure. What volume will it occupy at 900 torr pressure?

[匿名]

回覆: 1

2019-03-06 12:55 am

0.9775 grams of an unknow compound is dissolved in 50.0 mL of water. Initially, the water temperature is 22.3degree C.?

[匿名]

回覆: 1

2019-03-06 12:31 am

Help please?

[匿名]

回覆: 1

2019-03-05 11:35 pm

What is the pH of a 0.417 M solution of hypobromous acid (HBrO)? Ka = 2.8 ✕ 10^-9?

[匿名]

回覆: 2

2019-03-05 10:32 pm

What type of particle is present in a sample of aluminum chloride (AlCl3)?

[匿名]

回覆: 5

2019-03-05 10:07 pm

Solve math question?

[匿名]

回覆: 5

2019-03-05 9:36 pm

Solve. ​ log6x+log6(x−1)=1 ​?

[匿名]

回覆: 2

2019-03-05 5:34 pm

pre calculus?

[匿名]

回覆: 3

2019-03-05 1:10 pm

Calculate the frequency of a photon of this radiation (in hertz).?

[匿名]

回覆: 1

2019-03-05 3:29 pm

If the density of water at 29 oC is 0.9959 g cm-3, what is the mass of 10.00 mL of water in grams?