胡雪8°

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2018-05-30 3:45 pm

Which of the following statements are true?

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2018-05-30 11:13 am

Chemistry help?

[匿名]

回覆: 5

2018-05-28 9:08 pm

The area of Sarah's garden is given by A = 3(4 - x^2). Find the maximum area of her garden.?

[匿名]

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2018-05-28 9:22 pm

What is the molecular formula of a hydrocarbon with molar mass 98 g mol^-1?

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2018-05-28 8:13 am

why does energy change when expressed as per mole of reactant?

[匿名]

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2018-05-27 3:05 pm

The diagram represents three vessels that contain the same amount of Argon gas, but with different temperatures and volumes.?

[匿名]

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2018-05-27 6:48 pm

three beakers, three different bases, all same concentration. Beaker A pH of 10.4, Beaker B has a pH of 13.7, and Beaker C has a pH of 8.1.?

[匿名]

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2018-05-27 1:17 pm

A highly concentrated ammonia solution is found to have a pH of 12.08. What is the hydroxide concentration, [OH-(aq)] in mol L-1?

[匿名]

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2018-05-27 7:43 am

2 H2(g) + S2(g) ---equilibrium reaction arrow --- 2 H2S(g) At a certain temperature, Kc = 1.30 ✕ 1010 for the reaction above.?

[匿名]

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2018-05-26 9:21 pm

Which of the following would NOT increase the rate of reaction:?

[匿名]

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2018-05-25 2:42 pm

Write and balance the chemical reaction. Express your answer as a chemical equation. Identify all of the phases in your answer.?

[匿名]

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2018-05-23 7:48 pm

a gas has a volume of 6460 mL at 870 mm Hg and 77.2 C what is the volume of the gas at STP?

[匿名]

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2018-05-23 3:41 pm

At STP a gas occupies 720cm³, calculate the temperature at which the gas occupies 1000cm³ and with a pressure of 698mm/Hg?

[匿名]

回覆: 7

2018-05-20 10:20 pm

can someone help me to find the sector of a circle ?

[匿名]

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2018-05-20 9:29 pm

How do you balance REDOX reactions using the Oxidation Number method not the half reaction method step by step in the question below?

[匿名]

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2018-05-20 1:00 pm

Compound containing C & H is combusted. From a 20.0 gram of compound 67.5 g of CO2 & 13.8 g of H2O are obtained. What is empirical formula?

[匿名]

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2018-05-20 12:02 am

Chemistry Acid-Base pH Question?

[匿名]

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2018-05-16 9:35 am

The half-life of polonium-210 is 138.4 days.?

[匿名]

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2018-05-16 10:17 am

the periodic table is organized so that atoms of elements with the same number of valence electrons are in?

[匿名]

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2018-05-16 8:00 am

Chemistry post lab question :(?

[匿名]

回覆: 4

2018-05-15 3:20 pm

If the roots of the cubic equation x^3-2x^2+kx-27=0 are in geometric progression, determine the value of k?

[匿名]

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2018-05-15 1:36 pm

What is that OH- of a solution with (H3O+) = 9.3x10^-2 M?

[匿名]

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2018-05-15 7:55 am

calculate the molarity of a solution made by dissolving 346g ofcopper 2 chloride in 2500ml of water?

[匿名]

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2018-05-15 10:10 am

How do I find the amount of salt produced from 10.0 g of MgCl2 reacting with H2SO4? The balanced equation is MgCl2+H2SO4-->MgSO4+2HCl?

[匿名]

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2018-05-15 12:38 am

How many grams of KOH are needed to make 350 mL of 2.0 M solution?

[匿名]

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2018-05-13 2:02 pm

ICE Table question??

[匿名]

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2018-05-13 7:04 am

Chemistry help!!! Not sure how to go about solving this...?

[匿名]

回覆: 2

2018-05-13 12:34 pm

chemistry (pls show all ur step obtaining)?

[匿名]

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2018-05-09 11:59 pm

Electrolysis calculations?

[匿名]

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2018-05-09 8:50 am

Need help with this chemistry problem?

[匿名]

回覆: 1

2018-05-09 8:45 am

Need Help solving this chemistry problem?

[匿名]

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2018-05-08 9:18 pm

Name the following anions 1. O 2. N^-13 3. Br^-1?

[匿名]

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2018-05-07 1:31 am

A three person comitee is chosen at random from a group of 8 women and 3 men. Find probability that the committee contains at least one man?

[匿名]

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2018-05-06 11:23 am

Is this true "electrons flow from the positive terminal to the negative terminal inside the battery by chemical action"?

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2018-05-05 6:52 pm

Following question on ketones?

[匿名]

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2018-04-15 1:27 pm

Can someone help me? Need to find the area (Integration/Calculus)?

[匿名]

回覆: 3

2018-04-15 12:25 am

How many electrons are in 1 mol of hydrogen gas?

[匿名]

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2018-04-13 1:52 pm

Questions regarding Calculus Differentiation?

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2018-04-13 12:59 pm

What volume will 4.2 moles of neon has occupy at 27 degrees Celsius and a pressure of 47.2 kPa?

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2018-04-11 12:15 pm

CHEM LAB HELP: hardness of water, Urgent!?

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2018-04-11 12:40 pm

The molar solubility of calcium chromate in a 0.170 M calcium acetate solution is M.?

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2018-04-11 11:14 am

Calculate the critical angle for an air-water boundary. the inex of refraction of water is 1.33?

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2018-04-11 10:39 am

What is the pH of a solution prepared by mixing 10 mL of 0.10M NH3 and 5 mL of 0.24M NH4+? Ka for NH4 = 5.56x10^-10?

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2018-04-11 10:06 am

When 45 mL of 1.3 M sr(no3)2 mixes with excess alcl3 how many grams of srcl2 are produced?

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2018-04-11 9:21 am

Chemistry Enthalpy Question, explain pls Calculate the heat of reaction for 2 H2 + O2 = 2 H2O. Bond energies H2 436 kJ/mol, O2 498, HO 463?

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2018-04-11 3:36 am

What is the value of a?

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2018-04-10 11:37 pm

mol of nitrogen in 0.40 mol of caffeine.?

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2018-04-10 6:17 pm

rubber cement contains a polymer of 2-methylpropene (isobutylene) called polyisobutylene. write an equation for the polymerization reaction?

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2018-04-10 9:32 am

Chemical equations?

[匿名]

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2018-04-10 2:50 pm

have 500.0 g of water at 50.0 ◦C, how much energy would it take to turn it all into water vapor at 1 atm (Lf = 334 J/g and Lv = 2,260 J/g)?