ahmed A

What will be the genotypic ratio for a monohybrid heterozygous cross of (Aa x Aa)? What will the phenotype be? Why are the ratios different?

Calculate the molar concentration of 13.29% (w/w) Na2CO3 solution at 20°C given that its density is 1.157 g mL-1.

How many grams of 4.47% (w/w) solution of KOH in water is needed to neutralize completely the acid in 19.3 mL of 0.382 M H2SO4?

At 44.0 ºC and a pressure of 712 torr, a gas was found to have a density of 1.77 g L-1. Calculate its molar mass.

Consider the following statements: (1) Fe2+ is easily oxidized to Fe3+; and (2) Mn2+ is difficult to oxidize to Mn3+. On the basis of electron configurations of the ions, explain this difference in ease in oxidation by selecting all true statements.

Fe2+ is easy to oxidize to Fe3+ because removing the electron results in a half filled d subshell.

Mn2+ is difficult to oxidize to Mn3+ because Mn2+ has a half filled d subshell and by removing an electron the d subshell of Mn3+ is not half filled.

Fe2+ is easy to oxidize to Fe3+ because ions with an odd charge are most stable for atoms with an even atomic number.

Mn2+ is difficult to oxidize to Mn3+ because ions with an even charge are most stable for atoms with an odd atomic number.

Plus three cations are most stable for all atoms starting with the letters A - L, while plus two cations are most stable for all atoms starting with the letters M - Z.

A sample of 22.8 g of ammonium nitrate, NH4NO3, was dissolved in 135.8 g of water in a coffee cup calorimeter. The temperature changed from 27.87 °C to 17.71 °C. Calculate the heat of solution of ammonium nitrate in kJ/mol. Assume that the energy exchange involves only the solution and that the specific heat of the solution is 4.18 J/g°C.

Complete and balance the following if a reaction occurs. Write your answer as net ionic equation and include physical states of all compounds (including for water). If no reaction occurs write the left part of reaction and then click "NR".

Sn(s) + HCl(aq) ―>

Solid copper is added to aqueous concentrated nitric acid:

Zn(s)+ Cu2+(aq)―>

Ag(s) + Cu2+(aq) ―>

K2Cr2O7+HCl —> KCl+Cl2+H2O+CrCl3

KOH+SO2+ KMnO4 ―> K2SO4+MnO2+H2O

Enter a balanced net ionic equation for the reaction.

How many milliliters of 0.146 M sodium chlorate solution are needed to react completely with 41.6 mL of 0.524 M sodium bisulfite solution?

Chem help

Methanethiol, CH3SH, is a foul-smelling gas produced in the intestinal tract by bacteria acting on albumin in the absence of air. Write the balanced molecular equation for the combustion of methanethiol in an excess supply of oxygen. Do not include physical states in your answer.

A certain toilet cleaner uses NaHSO4 as its active ingredient. In an analysis, 0.500 g of the cleaner was dissolved in 30.0 mL of distilled water and required 31.6 mL of 0.00793 M NaOH for complete neutralization in a titration. The net ionic equation is

HSO4- + OH- → H2O + SO42-

What is the percentage by weight of NaHSO4 in the cleaner?

FeCl2

silver nitrate

barium sulfate

Ni(OH)2

copper(II) carbonate

Ca(NO3)2

Microsoft Excel

Internet Explorer

Windows XP

All of the above

It is always better to run over and give more information when you are giving a presentation versus quitting on time.

True

False

The internet is a collection of computer networks?

True or False