不用客氣

[匿名]

回覆: 1

2016-09-23 6:34 pm

What is the correct IUPAC name for 3-ethyl-3-isopropylbutane?

[匿名]

回覆: 4

2016-09-13 4:35 pm

Calculate the mass of a sample of gold that occupies 0.91 cm3. The density of gold is 19.3 g/cm3?

[匿名]

回覆: 1

2016-08-26 5:00 pm

Calculate how much of the solid reagent you would add to make the following solution: 10 mL of 100mg/ml ampicillin (MW = 371.4 g/mole)?

[匿名]

回覆: 1

2016-08-05 7:34 am

Which salt is the least soluble acoorinding to equilibrium constant?

[匿名]

回覆: 2

2016-08-04 7:24 am

Can someone please help with this chemistry question? Working would be appreciated!?

[匿名]

回覆: 1

2016-08-03 7:12 am

why is NO2 bent while [NO2]+ is linear?

[匿名]

回覆: 3

2016-08-02 5:47 pm

四面骰子問題 請問如果有一顆四面骰子標示1234 連骰70次 都沒有出現2的機率是多少？

[匿名]

回覆: 2

2016-08-02 8:51 pm

Algebra Help?

[匿名]

回覆: 2

2016-08-02 5:36 pm

What happens when you mix 25 mL vinegar and 15 mL baking soda?

[匿名]

回覆: 1

2016-08-02 2:07 am

Write the formula for the coordination compound pentaaquachloroiron(III) iodide and diamminedichlorocopper(II).?

[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: 2

2016-08-01 3:47 am

What is the IUPAC name for a chain of 6 carbons with NH2 on the second carbon and a benzene ring on what I'm assuming is the fourth carbon?

[匿名]

回覆: 2

2016-07-31 8:47 pm

For the following reactions please write the a) molecular equation b) the total ionic equation c) the net ionic equation?

[匿名]

回覆: 3

2016-07-31 6:21 pm

Which of the following is the general term for the sequence a, -a, a, -a, . . .?

[匿名]

回覆: 1

2016-07-31 4:35 pm

A sample of 6.92 grams of NaOH is dissolved into 715 mL of aqueous 0.250 M NaOH (assume no volume change).?

[匿名]

回覆: 2

2016-07-31 11:22 am

How do you do this math problem? Show your work?

[匿名]

回覆: 2

2016-07-30 3:24 pm

"Write a balanced nuclear equation for the beta decay of each of the following" HELP PLEASE?

[匿名]

回覆: 6

2016-07-30 1:02 pm

log4 (7-4x)=1 find x?

[匿名]

回覆: 1

2016-07-29 7:42 am

Simplifying Trig Expressions?

[匿名]

回覆: 1

2016-07-25 5:34 pm

1. Calculate the molarity of the following solutions a. 1.0mol KCl in 750mL of solution b. 0.50mol MgCl2 in 1.5L of solution HELP PLEASE?

[匿名]

回覆: 1

2016-07-25 7:30 pm

Equilibrium problem assistance?

[匿名]

回覆: 1

2016-07-24 10:34 am

定溫、壓下，8升氧氣重兩克，十升某氣重五克，則某氣之分子量為：？

[匿名]

回覆: 1

2016-07-24 10:33 am

定溫、壓下，8升氧氣重兩克，十升某氣重五克，則某氣之分子量為：？

[匿名]

回覆: 1

2016-07-24 10:34 am

定溫、壓下，8升氧氣重兩克，十升某氣重五克，則某氣之分子量為：？

[匿名]

回覆: 1

2016-07-24 11:02 am

定溫 壓下 8升氧氣重兩克10升某氣重五克 則某氣之分子量為？

[匿名]

回覆: 2

2016-07-25 5:35 am

Physics Question?

[匿名]

回覆: 4

2016-07-24 3:17 pm

Integrate e^x sinx dx?

[匿名]

回覆: 3

2016-07-20 8:36 pm

what value of c makes x^2-24x+c a perfect sqaure trionomial? A.-144 B.-48 C.48 D.144 Need help asap please! Thank You?

[匿名]

回覆: 1

2016-07-20 7:04 pm

Trig identities help!?

[匿名]

回覆: 1

2016-07-20 5:03 am

Molar absorptivity coefficient?

[匿名]

回覆: 3

2016-07-20 8:04 am

How many moles of HCl are consumed per mole of Mg? Mg(s) + 2 HCl(aq) → MgCl2(aq) + H2(g)?

[匿名]

回覆: 1

2016-07-20 8:56 am

A hydrocarbon consist of 92.3 carbon, if its vapor density is 39 determine its molecular formula?

[匿名]

回覆: 1

2016-07-19 2:33 pm

What volume of this freshly prepared 0.500 M HNO3 would be needed to neutralize 2.00 g of Ca(OH)2?

[匿名]

回覆: 3

2016-07-19 4:55 am

Let Θ be an acute angle such that sin Θ = 0.28. Find the value of cos Θ using trig identities. Round your answer to two decimal places.?

[匿名]

回覆: 2

2016-07-18 7:14 am

True or false about Pressure of a gas...?

[匿名]

回覆: 7

2016-07-17 9:14 pm

√21*√3 = ?

[匿名]

回覆: 2

2016-07-17 6:54 pm

Is "mineral" just another name for "metals" on the periodic table?

[匿名]

回覆: 2

2016-07-17 4:32 pm

math problem help please?

[匿名]

回覆: 1

2016-07-17 3:35 am

What is the volume of a tank of nitrogen if it contains 17 moles of nitrogen at 34 C under 12,000 Pa?

[匿名]

回覆: 2

2016-07-15 1:41 pm

Determine the exact value for x if: log2 x + log2(x − 7) = log2 7x?

[匿名]

回覆: 1

2016-07-13 5:52 pm

Find the area of triangle formed by the positive x axis and the tangent and normal to the curve x^2 +y^2=9 at (2,root 5)?

[匿名]

回覆: 2

2016-07-13 3:47 pm

When a certain drug is taken orally, the concentration of the drug in the patient's bloodstream after t minutes is given by?

[匿名]

回覆: 2

2016-07-13 8:53 am

Please change into an ionic equation: copper sulfate + sodium hydroxide ---> copper hydroxide + sodium sulfate?

[匿名]

回覆: 2

2016-07-13 3:15 am

What times itself equals 12?

[匿名]

回覆: 2

2016-07-13 1:48 am

Which of the following molecules is covalently bonded?

[匿名]

回覆: 2

2016-07-12 5:58 pm

Find the coordinates of the point which is at a distance of 2 units from (5,4) and 10 units from (11, - 2).?

[匿名]

回覆: 1

2016-07-12 12:08 pm

chemistry help?

[匿名]

回覆: 1

2016-07-12 5:10 am

SO3 (1.27×10-2 M), SO2 (4.11×10-2 M), and O2 (2.68×10-2 M). What is the value of the equilibrium constant for this reaction at 1300 K?

[匿名]

回覆: 2

2016-07-12 7:15 am

Math Ans=-cot^2x+c/2?

[匿名]

回覆: 1

2016-07-11 7:57 pm

You have an unknown compound of Potassium derivatives (KlxOy)...?