戇戇居士

[匿名]

回覆: 2

2016-08-02 9:19 pm

Can Acetone hydrogen bond with itself? why does it have a lower boiling point than cyclohexane?

[匿名]

回覆: 3

2016-08-02 7:30 pm

Ksp Question?

[匿名]

回覆: 1

2016-08-02 7:30 pm

Ph of HCL and dissociationdegree pleasse help?

[匿名]

回覆: 4

2016-08-02 6:24 pm

Maxima and Minima of Quadratic function help?

[匿名]

回覆: 1

2016-08-02 5:07 pm

How would you do this maths binomial expansion question? I have no idea. <https://gyazo.com/adabd2e0933df6e036d19420e0095125>?

[匿名]

回覆: 2

2016-08-02 10:27 am

On newton law of motion?

[匿名]

回覆: 1

2016-08-01 9:15 am

what type of solid is formed for each of the substances: C2H5OH,CH4,CH3Cl,MgSO4 arrange these substance in order of increasing melting point?

[匿名]

回覆: 4

2016-08-01 6:43 am

What is the total distance traveled by the ball for 0<=t<=2?

[匿名]

回覆: 1

2016-07-31 9:51 pm

Calculate how many moles of SOCl2 are in 35.0g of SOCl2.?

[匿名]

回覆: 3

2016-07-31 5:41 pm

What volume of 0.408 M K3PO4 is required to react with 28 mL of 0.75 M MgCl2 according to the equation?

[匿名]

回覆: 6

2016-07-31 4:12 pm

A man is 6 feet 2 inches tall. To find the height of a tree, the shadow of the man and the shadow of the tree were measured.?

[匿名]

回覆: 4

2016-07-31 7:20 am

A balloon contains 25 g of helium gas. If 5 grams of helium gas is released from this balloon then the balloon will have a smaller volume.?

[匿名]

回覆: 3

2016-07-30 1:46 pm

a^3+b^3-c^3+3abc=?

[匿名]

回覆: 1

2016-07-29 4:04 pm

A 19.0-L tank of carbon dioxide gas (CO2) is at a pressure of 9.10 x 10^5 Pa and temperature of 21.0°C.?

[匿名]

回覆: 3

2016-07-29 5:25 am

Chemistry help please?

[匿名]

回覆: 2

2016-07-25 5:49 pm

If 5 kg of haematite gives 2.78 kg of iron what is percentage purity of haematite?

[匿名]

回覆: 1

2016-07-25 5:57 pm

If 5 kg of haematite contain 2.78 kg of iron then what is the percentage purity of haematite. It contains gangue?

[匿名]

回覆: 1

2016-07-25 7:21 am

A dilute aqueous solution of Na2SO4 is electrolyzed between Pt electrodes for 3.75 h with a current of 2.85 A .?

[匿名]

回覆: 3

2016-07-25 5:01 am

Proving identities?

[匿名]

回覆: 2

2016-07-24 4:26 pm

What is x+6/2 + x-9/5 as a single fraction?

[匿名]

回覆: 2

2016-07-24 3:10 pm

nitric acid + zinc?

[匿名]

回覆: 4

2016-07-20 7:58 pm

IF cos(-θ)=(3/5) and sinθ <0, find tan θ?

[匿名]

回覆: 5

2016-07-20 6:50 pm

One lit of an unknown gas weighs 1.25 grams at s.t.p one possiboe formula of gas Co2 Co O2 So2?

[匿名]

回覆: 2

2016-07-20 6:38 am

what is the density of methane gas at room temperature ?

[匿名]

回覆: 14

2016-07-20 8:44 am

Solve the inequality. Write the solution set in interval notation. 9x + 7 ≥ 5x + 3x?

[匿名]

回覆: 2

2016-07-19 3:31 pm

Are the two carbon atoms of C2H5Cl equivalent?why? How about the 5 H atoms?Are they equivalent, if so why?

[匿名]

回覆: 2

2016-07-19 3:05 pm

X^4 - 4x2 and 4x^2 - 9, solve the following?

[匿名]

回覆: 4

2016-07-19 4:50 am

Finding the derivative of F(t)=ln(arctan(t)). Can someone please help me find the derivative of this function? Thank you in advance!?

[匿名]

回覆: 1

2016-07-18 6:52 am

Find the arc length of a circle if the central angle measures 90degrees and the radius measures 30 inches?

[匿名]

回覆: 1

2016-07-18 5:13 am

How would you prepare 2-butanol from 1-propanol?

[匿名]

回覆: 2

2016-07-17 8:58 pm

Thermochemistry question.?

[匿名]

回覆: 2

2016-07-17 6:29 pm

Two cylindrical wires are made of the same metal. If wire 2 has 8 times the length and 10 times the diameter of wire 1.?

[匿名]

回覆: 1

2016-07-17 4:07 pm

A 1.0-L buffer solution is 0.120 M in HNO2 and 0.180 M in NaNO2. A)Determine the concentrations of HNO2 and NaNO2 after addition of 1.7 g HC?

[匿名]

回覆: 2

2016-07-17 12:06 pm

Maths problem help please?

[匿名]

回覆: 1

2016-07-17 5:29 am

Calculus Antiderivative?

[匿名]

回覆: 1

2016-07-15 12:22 pm

Find the value of x square + 1 / x square if x - 1/x =root 3?

[匿名]

回覆: 2

2016-07-13 7:48 pm

How do i solve this trig equation. ((sin(s)^2 - sin(s) - 2)(1 - sin(s))/(cos(x)^2?

[匿名]

回覆: 3

2016-07-13 6:02 pm

x+y+z=5 x+y=6 y+z=4 In the solution of the equations above, y=? A.1 B.2 C.3 D.4 E.5?

[匿名]

回覆: 2

2016-07-08 7:41 am

濃鹽酸12N (1)配置成100ML的3N HCL須加多少水及濃鹽酸? (2)配置成500ML的0.1N HCL 須加多少濃鹽酸極佳多少水?

[匿名]

回覆: 5

2016-07-13 4:07 am

In 72 hours the amount of a radioactive substance has reduced from 40 mg to 20 mg. What is the half-life of this isotope?

[匿名]

回覆: 2

2016-07-13 2:53 am

-2/3x+30>80?

[匿名]

回覆: 4

2016-07-13 1:58 am

the values of x and y are directly proportional, and y=4 when x=5. what is the value of y when x=20?

[匿名]

回覆: 3

2016-07-12 5:38 pm

If α,β,γ are the roots of x3+2x2−3x−1=0, then α−2+β−2+γ−2= Explain please?

[匿名]

回覆: 1

2016-07-12 4:43 pm

In a dilution, 10.0 mL of solution X is diluted to 100.0 mL of solution Y?

[匿名]

回覆: 1

2016-07-12 5:40 am

What is the concentration of methanol in a solution prepared by combining 8.65mL of a 3.669M methanol solution with 16.35mL of water?

[匿名]

回覆: 1

2016-07-12 7:03 am

For the reaction KOH(aq) --> K+(aq) + OH-(aq) , K = .316. If the concentration of KOH is 4.75M at equilibrium, what is the concentration...?

[匿名]

回覆: 2

2016-07-11 8:04 pm

The addition of HF to 2-butene produces what?

[匿名]

回覆: 2

2016-07-11 4:20 am

The addition of HF to 2-butene produces what?

[匿名]

回覆: 3

2016-07-08 4:44 pm

Express sin 673 as a trig function of a positive acute angle less than 45? I don't understand how the answer is -cot43 HELP?

[匿名]

回覆: 2

2016-07-08 2:52 pm

If 64.9 g of sodium and 62.3 g of chlorine are used, how many grams of sodium chloride are produced?