胡雪8°

calculate the number of moles in 6o gm NaOH?

why does absorbance of light increase as the concentration of dissolved food dye in a solution increases?

A solution contains [Ba+2]=0.075M and [Pb+2]=0.015M. Which one will precipitate first if 1M Na2SO4 is added to the solution?

calculate the energy difference for a transition in the paschen series for a transition from the higher energy shell n=5?

ball that contained 25.0 L of air at 22C and 6.25 atm pressure was placed in an oven at a temperature of 100C. what is the new pressure?

Chemistry titration help!!!!?

HELP WITH GEN CHEM 2, Please show work?

a 3.00 ml aliquot of 0.001 M NaSCN is diluted to 25.0 mL with 0.2 M Fe(NO3)3 and 0.1 M HNO3.?

can somebody help name these compounds?

identify the reagents represented by the letters a through d in the following scheme?

int2xlnx^2dx?

Ochem 1 drawing mechanism for the conversion of pentan-3-one to its enol form?

Chemistry help wanted!?

bicarb soda reacting with vinegar, name one substance that has a covalent and ionic bond?

Why does magnesium have a large increase between its second and third ionization energies?

Chemistry - adding a strong acid to buffer, how will this change pH?

What mass of iron(III) oxide must be used to produce 87.90 g of iron?

What is the molar mass of a compound if 25.0 g of the compound dissolved in 750. mL gives a molarity of 0.290 M?

a compound made of 5.89g cobalt, 2.80 nitrogen & 9.60g oxygen. determine the emperical formula of this compund?

chemistry of solutions?

Consider 2 H2S + SO2 -> 3 S + 2 H2O.How many moles of H2S must react to form 4.0 moles of S?How many moles of SO2 react to form 4 mol of H20?

Calculate the ratio of CH3NH2 to CH3NH3Cl required to create a buffer with pH = 10.18.?

CHEM HELP PLEASE?

PLEASE HELP !?

Find the [H+].?

A gas has a pressure of 6.46atm at 227 degrees Celsius. What will it’s pressure be at 27 degree Celsius, if the volume is held constant?

which of the following species would not function as an oxidizing agent mno4-, mn2+,?

Titrations, pH curves, and Indicators? 10 Points!?

Chemistry Homework Help!?

these all collisions between molecules of reactiong substances result in a chemical union?

What determines a polarity or non polarity? How do we know which atom will be negatively charged?

What kind of nuclear reaction is seen in the following reactions? (the particle 1/0 n is a neutron)?

how many moles of hydrogen will be produced from 17.3 g of aluminum in 2Al+3H2SO4=3H2+Al2(SO4)3?

Chem help?

HELP WITH CHEM!!!!?

When a gas reaches its condensation point it becomes a what?

M1V1n1 = M2V2n2 Suppose that 17.38 mL of 0.02765 M aqueous H2SO4 is required to neutralize 10 mL of an aqueous solution of KOH.?

Why is there no stoichiometry calculation needed to determine the limiting reactant of a decomposition reaction?

For the equation C6 H12 O6 = 2C2 H5 OH + 2CO2, how much ethanol is produced in grams if we start with 750 grams of glucose?

Conceptual question about activity level and molar concentration?

Chemistry Question: For the ignition test, to determine whether unknown chemical has a benzene ring, how would you explain the chemistry?

Determination of the vanadium:oxalate ratio in the complex?

physics question dealing with reflection?

HELP IN CHEMISTRY?!?

Chemistry Problem?

What part or functional groups of the amino acid molecule reacts with the ninhydrin?

How many grams of chlorine can be liberated from the decomposition of 52.0 g of AuCl3 by this reaction? 2 AuCl3 ---> 2 Au + 3 Cl2?

Name the coordination compounds. Chemistry?

Calculate the pH and [S2− ] in a 0.17 M H2S solution. Assume Ka1 = 1.0 ✕ 10−7; Ka2 = 1.0 ✕ 10−19.?

In basic solution, _______.?