Chemistry

How to do stoichiometry questions

i have an exam tomorrow and i need to now how to do these things. Can someone please do an example and explain step by step plus how to find molar mass. If you have time can you also tell me -mole r

Redox reactions in a basic solution? 1/2 reactions

What would be the 1/2 reactions (oxidation and reduction) of this redox problem? And if possible, what is the final answer? NH3(g) + O2(g) > NO(g) + H2O(g) in a basic solution Please help, thank you

Help with determining oxidation numbers

Give oxidation numbers for each element in the reactions below. Also, if you specify which substances are being oxidized or reduced, Id really appreciate it! 1. Al(s) + O2(g) ---> Al2O3(s) 2. NO3-(a

Help with net ionic equations

Write net ionic equations for: 1. 3 AgNO3 + Na3PO4 ---> Ag3PO4 + 3 NaNO3 2. 2 NaOH + MgCl2 ---> 2 NaCl + Mg(OH)2 3. K2SO4 + BaCl2 ---> 2KCl + BaSO4 Thanks in advance!-1. 3 Ag+ PO4 ---> Ag3PO4

What exactly happens to the skin when it comes in contact with a caustic substance

Obviously the skin is damaged or burned but I want to know how this occurs chemically. I know Im not being specific in the type of acid involved, (I am not very familiar with chemistry) but in gener

When balancing a chemical equation it is OK to change...?10 POINTS!

When balancing a chemical equation it is OK to change: AnswerA. the subscripts in the formulasB. the number of atoms of each element in the formulasC. the coefficients in front of the formulasD. the f

Thermochemistry Help!

455566333 A skillet made of Copper (Cu) weighing 1.3 kg is heated on a stove to a temperature of 227 oC. If the skillet is removed from the stove and allowed to cool to room temperature (21oC), how m

Calculate the concentration of ion remaining, HARD CHEMISTRY

4) Calculate the mass of AgCl formed, and the concentration of silver ion remaining in solution, when 10.0g of solid AgNO3 is added to 50mL of 1.00 X 10^-2 M NaCl solution. Assume the volumes are addi

Activation energy is...Chemistry.10 POINTS.

Activation energy is: AnswerA. The energy necessary to build the activated complex and get the reaction startedB. The energy released in a chemical reactionC. The energy absorbed by a reactionD. The e

What does an alcohol form when reacted with heat and an acid catalyst

Page 61 of the textbook linked below shows at the bottom that Elimination (dehydration) forms an Ester. but the molecule drawn above is clearly an alkene... is the textbook just incorrect? or have i m

The mass of NaOH needed to produce 200mL of a 0.30M solution is

a) 2.4g b) 5.6g c) 8.0g d) 13.3g please show working out because im not quite sure how to do, thank you so much :)-V = 200mL = 0.2 (L) Molarity = 0.30M ***Molarity = number of moles / volume => # of

Chemistry Question!? Net Ionic Equations

Write the net ionic equation only for any precipitation reaction which forms when the following solutions are mixed: a) sodium sulphide and lead (II) nitrate b) calcium hydroxide and aluminium iodi

Hess's law help chemistry

Fe2O3(s) + 3 CO(g) = 2 Fe(s) + 3 CO2(g) Given: 2 Fe2O3(s) = 4 Fe(s) + 3O2(g)
H = 1602.6 kJ/mol CO(g) = C(s) +(1/2) O2
H = 110.5 kJ/mol C(s) + O2(g) = CO2(g)
H = −393.5 kJ/mol Answer in units of kJ

Why do we see droplets of water on the outer surface of glass containing ice cold water??

Chapter- Matter-When water vapour in the air comes into contact with the colder surface of the glass, it condenses with it and forms water droplets. :)-the air outside the glass is warmer and contains

BALANCE THIS EQUATION:

C2H6 + O2 ------> H20 + CO2 Thanks xxx-The anwser is 2 (C2H6) + 7(O2) =4 (CO2) + 6 ( H2O) left side : C=4 , H= 12, O=14 right side : C=4 , H= 12, O=14 so they are balance !-2C2H6+ 7O2=4CO2+6H2O-