Richard H.

05/06/23

A 25.0 mL solution of HNO₃ is neutralized with 19.1 mL of 0.250 M Ba(OH)₂. What is the concentration of the original HNO₃ solution?

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08/18/22

Lone pairs (Chemistry Question)...

Dear experts,I would like to know whether the lone pairs of the atoms actually (squeeze) the atom into formingspecific molecular structures. For example PH3 and NH3 molecules both have 1 lone pair,... more

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Statistics

07/15/22

What are the chances that one places exactly 3 bets before stopping?

A roulette wheel has 38 numbers. Eighteen of the numbers are black, eighteen are red, and two are green. When the wheel is spun, the ball is equally likely to land on any of the 38 numbers. Each... more

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Chemistry

03/04/22

How do you solve this

Are any of these equations redox reactions? if so what are their reducing and oxidizing agents?CuSO4(aq)+Zn(s)→ZnSO4(aq)+Cu(s)HCl(aq)+NH3(aq)→NH4Cl(aq)2Ca(s)+O2(g)→2CaO(s)

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Organic Chemistry

08/09/21

what are some organic derivative preparations that can be used to determine melting point?

i need examples other than acetylation of amines, oxidation of aldehyde and 2,4-Dinitrophenylhydrazone from Carbonyl Compound asap to determine melting point, please help

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Biology Chemistry Biochemistry

07/20/21

Biochemistry Question

If 2 mL of 0.5 M NaOH is added to 50 mL of 0.1 M sodium phosphate buffer at pH 7.0, what is the resulting pH? If 5 mL of 0.1 M HCl is added to 50 mL of 0.1 M sodium phosphate buffer at pH 7.0,... more

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Chemistry

03/26/21

What is the pH of 0.75M solution of C5H5 NHCl? Kb for C5H5N = 1.7*10^ -9

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History American History European History

08/30/20

To what extent was the development of the world from 1450-1900 premised on piracy?

Be sure to consider Asia, Africa, Europe, and the Americas.

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Chemistry

08/29/20

Calculate the volume for 1 mole of aluminum and strontium using the molar masses.

Calculate the volume for 1 mole of aluminum, Al, and Strontium, Sr, using the molar masses (Al = 26.982 g/mol and Sr = 87.62 g/mol) and the known densities (Al = 2.70 g/mL and Sr = 2.54 g/mL).

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Chemistry

08/21/20

A specific brand of gourmet chocolate candy contains 7.00 g of dietary fat in each 22.7-g piece. How many kilograms of dietary fat are in a box containing 1.00 lb of candy?

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Literature Greek Trojans

08/16/20

The Illiad Story

In the Iliad, there is a a division or contrast between two things that are or are represented as being opposed or entirely different, between war and peace, suffering and understanding. How can... more

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Organic Chemistry

07/18/20

Enolate vs Nucleophile Reaction

How do you know if a reaction will form an enolate or attack at the carbonyl carbon? For example, if I added -OCH2CH3, would this attack the carbon or take a hydrogen to form the enolate?

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Finance

06/28/20

Average stock price

Sandy bought 100,000 shares of stock at $1.50. The following week the price of the stock fell to $.75. How many shares of stock does Sandy need to buy to have an average price of $.75?

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History World History

05/19/20