Chemistry Answers

How many ions are in 6 moles of NH4+?

Compare the mechanisms for the following substitution and addition reactions of benzene:

o   the Friedel-Crafts reaction 

o   the sulfonation of benzene

o   the chlorination of benzene 

o   the hydrogenation benzene

You will need to illustrate and explain the reaction mechanism for each one, as well as the similarities and differences that exist between them.

Could you list some similarities and differences for each mechanisms please?

Compare and contrast the 7 crystal system.

One mole is the amount of any given chemical substance that helps us to measure it's mass conveniently on a scale of C¹² Isotope.

How many particles (atoms of carbon) are present in 12 g of C¹² isotope of a naturally occuring sample of carbon.

calculate the average atomic mass of sulfur if 95.00 of all sulfur atoms have a mass of 31.972 u, 0.76% has a mass of 32.971 u and 4.22% has a mass of 33.967u

Explain different types of thermodynamic systems with suitable examples.

Define chemical thermodynamics and outline its significance.

The rate of a reaction at 25 °C is 2×+0^-3.Then the rate of reaction at 35°Cis approximately

1. Determine the volume of 0.7M hydrochloric acid needed to fully neutralize 60 mL of 0.5M Ca(OH)₂.
2. If 50 mL of 1.2M H₃PO₄ is neutralized by 75 mL of NaOH, what is the concentration of the NaOH?
3. What volume of 0.2M HNO₃ acid would be needed to fully neutralize 1L of 0.4M KOH?
4. 200 mL of 2M Sr(OH)₂ fully neutralized 60 mL of H₂SO₄. What is the concentration of the acid?

Lean meat is marinated and added moisture through brining. In brining, a mixture of salt and water is used to soak the meat for a few hours or days before cooking.

Basic Brine: Make 3880 grams brine for 2.72 kg of meat

Procedure:

a. Mix 250 grams of salt (NaCl) with 3880 grams of water.

b. If you make sweet brine, mix 250 grams of sugar (C₁₂H₂₂O₁₁) to solution of salt and water.

Problem: What is the molal concentration of the brine solution (250 g salt + 3880 g water)?