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200 Answered Questions for the topic chem

05/19/20

What is the concentration of bromide ion if 25.0 ml of a 0.50 M AlBr3 solution combines with 40.0 ml of a 0.35 M NaBr solution?

I converted AlBr3 and NaBr to moles however, I'm not so sure what to do after that. I know the final answer for the concentration of bromide ion is 0.79 mol/L. Can someone please help ?AlBr3 =... more

05/19/20

Can someone please tell me if there is an easier way to answer this question? and if I did it correctly please.

A 2.32g sample of Na2SO4*nH2 yields 1.42g Na2SO4 upon heating. What is the value of n?Na2SO4*nH20--->Na2SO4(s)+nH20(g)Molar Mass Na2SO4 =142 g/molMolar Mass H2O = 18.016 g/molI'm not sure if I... more

05/19/20

Please help! I cannot figure out the steps of going from mass of Hydrogen to moles of carbon in ethanol.

A sample of ethanol (C2H6O) contains 3.024g of hydrogen. How many moles of carbon are in the sample ? Molar Mass of ethanol (C2H6O)=46.07g/mol

05/06/20

Water can decompose into H2 and O2 via electrolysis. How many moles of H2 could theoretically be obtained from 87.5 g of water. theoretical yeild: mol H2

Water can decompose into H2 and O2 via electrolysis. How many moles of H2 could theoretically be obtained from 87.5 g of water. theoretical yeild=:________________ mol H2
Chem Chemistry

05/06/20

Consider the following oxidative half reaction:

Mn(s) --> Mn2+ + 2e-A) Couple the oxidation reaction with a reduction half reaction that makes the overall redox reaction non-spontaneous (electrolytic cell). Write the balanced redox reaction... more
Chem Chemistry

05/06/20

Consider the following unbalanced redox reaction:

ClO3-(aq) + I-(aq) --> I2 (s) + Cl-(aq)A) Balance the redox reaction using water (H+ and OH-) as needed. Show work for each step.B) Identify the oxidizing reagent and the reducing reagent for... more
Chem Chemistry

05/06/20

Consider the following two redox reactions without any companion counterions:

Cr(s) --> Cr3+ + 3e- oxidation half Ag(s) --> Ag+ + e- reduction half A) Write a balanced overall redox reaction where Cr is oxidized and Ag is reduced. Show work with cancelling of... more

BioOrganic Chemistry Problem

Look at the structural formula for D-tagatose.To what class of biomolecules does D-tagatose belong? What functional groups can you identify in D-tagatose? Would D-tagatose be soluble in water?... more
Chem Chemistry

05/05/20

What is the pH of a buffer?

The Ka of H2CO3 is 4.3 x 10-7. What is the pH of a buffer with 0.10 M H2CO3 and 0.010 M NaHCO3?
Chem Chemistry

05/05/20

What is the pH of a buffer?

The Ka of H2CO3 is 4.3 x 10-7. What is the pH of a buffer with 0.050 M H2CO3 and 0.50 M NaHCO3?
Chem Chemistry

05/02/20

For the following gaseous reaction:

2 NO2 +F2 --> 2NO2F Generalized rate equation = k(PNO2)2 (PF2)You test the initial kinetics of the above reaction and get the following results:Initial: PNO2 = 1 atm, PF2 = 1 atm --> rate of... more
Chem Chemistry

05/01/20

Reaction 1 and Reaction 2 are the first and second step in series for overall reaction 3.

1) CaCO3 (s) <--> Ca2+ (aq) + CO32-(aq) KC1 = 10-6.32) H+(aq) + CO32-(aq) <--> HCO3-(aq) KC2 = 10-10.33) ? <--> ? Ktotal = ?A. Write the reaction for... more
Chem Chemistry

05/01/20

For the following reaction: A+2B+3C+D --> E , the kinetics expression has been experimentally determined to be: rate = k[A]^2[B][C]^0.5

a) What is the reaction order with respect to each of the reactants (A,B,C, and D)?b) What is the overall order of the reaction?c) If you were to double the initial concentration of A, half the... more
Chem Chemistry

05/01/20

Write a generalized rate equation for the reaction with variables for the order of reactions. Hint: do gaseous reaction use brackets or P?

For the following gaseous reaction: 2 NO2 +F2 --> 2NO2F

Finding the difference in solubility

Consider the solubility of Ca(OH)2 in each of the following solutions. For each solution, indicate whether the Ca(OH)2 solubility will increase, decrease, or not change as compared to the... more

04/25/20

Titration equivlance point

Calculate the pH at the equivalence point for the titration of 4.938 M HA (a weak acid with pKa = 3.55) with 4.938 M NaOH. 

04/25/20

Rate of reaction question

I. Increasing the temperature increases the rate of a chemical reaction BECAUSE II. the activation energy is lowered. A) I is TRUE, II is FALSE B) I is FALSE, II is TRUE C) I and II are BOTH FALSE... more

04/22/20

How many atoms are there in 0.228 moles of water?

using dimensional analysis?

04/22/20

How many molecules of nitrogen are there in 7.55 moles of N₂?

using dimensional analysis?

04/21/20

CHEMISTRY DECOMPOSITION

For the decomposition of nitramide in aqueous solution at 25°C, the rate of the reaction is determined by measuring the appearance of N2O. NH2NO2(aq)=N2O(g) + H2O(l)At the beginning of the reaction... more

04/21/20

What volume of a .271 M HNO3 solution is required to neutralize 23.4 mL of a .112 M Ba(Oh)2 solution?

What volume of a .271 M HNO3 solution is required to neutralize 23.4 mL of a .112 M Ba(Oh)2 solution?

04/21/20

What Volume of a 0.53 M HCl solution is required to neutralize 16.5 mL of a .124 M Ca(OH)2 Solution?

What Volume of a 0.53 M HCl solution is required to neutralize 16.5 mL of a .124 M Ca(OH)2 Solution?
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