07/16/20

20. NEED HELP FAST

The  p𝐾a  of hypochlorous acid is  7.530 . A  52.0  mL solution of  0.145  M sodium hypochlorite ( NaOCl ) is titrated with  0.321  M  HCl .Calculate the pH of the solution after the addition... more
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07/16/20

which of the following about enzyme catalysis are true?
(A) Non-catalyzed biochemical reactions always occur at physiological useful timescales.(B) They are generally equally active on D and L isomers of a given substrate.(C) They can increase the... more
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07/16/20

In the double-reciprocal plot of Michaelis-Menten kinetics in the presence and absence of an inhibitor, which of the following are true?
(A) This is a competitive inhibition.(B) This is an uncompetitive inhibition.(C) The binding site of the inhibitor is different to that of the substrate.(D) The number 3 represents the enzymatic... more
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07/16/20

Which of the following about Michaelis-Menten kinetics (m-M) are true?

(A) It is applied when the steady-state assumption is hold. (B) kcat (or k2 above) is called turnover number.(C) KM is numerically equal to the affinity between the substrate and the enzyme.(D) The... more
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07/14/20

NEED HELP FAST!!!!

The reactionC4H8(g)⟶2C2H4(g) has an activation energy of  262 kJ/mol.  At  600.0 K,  the rate constant,  𝑘,  is  6.1×10−8 s−1.  What is the value of the rate constant at  790.0 K?
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07/13/20

Find the molecular formula of each compound:
C6H7N 186.27 g/mol C2HCl 241.90 g/ mol C5H10NS2 593.11 g/ mol not sure what i'm doing wrong :(
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07/13/20

NEED HELP FAST!!!!

Consider the given reaction.A(aq)+B(s)↽−−⇀C(aq)𝐾=9.40Suppose  13.7 mol A  reacts with excess  B  in  5.90 L  of solution. Calculate the concentration of  C  at equilibrium.
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07/13/20

Find the total number of atoms in a sample of cocaine hydrochloride, C17H22ClNO4, of mass 24.0 mg

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07/13/20

In this titration, 25 cm3 of 0.100 mol dm-3 monoprotic acid is in the conical flask and sodium hydroxide solution is added from the burette. Name a suitable indicator. Explain why it is suitable.
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07/12/20

0.50 cm3 of 0.200 mol dm-3 hydrochloric acid is added to the buffer solution. Calculate the new pH.
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07/12/20

Explain why there is only a small change in pH when a small amount of acid is added to this buffer solution.
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07/12/20

A buffer solution is made by mixing 40 cm3 of 0.200 mol dm-3 ethanoic acid (pKa 4.76) with 100 cm3 of 0.100 mol dm-3 sodium ethanoate. Calculate the pH of this mixture.
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07/12/20

What is a buffer solution
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07/12/20

Water has a pH of 6.14 at 373K. Calculate the ionic product of water (Kw) at this temperature
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07/12/20

25 cm3 of 0.400 mol dm-3 methanoic acid (pKa 3.75) is mixed with 50 cm3 of 0.100 mol dm-3 sodium hydroxide. Calculate the pH of this mixture
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07/12/20

Ethanoic acid has pKa value of 4.76 Trichloroethanoic acid has pKa value of 0.51 State which acid is stronger and suggest why it is stronger.
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07/12/20

Find the pH of a mixture of 25 cm3 0.100 mol dm-3 sulfuric acid and 80 cm3 of 0.200 mol dm-3 sodium hydroxide.
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07/12/20

help, I got a question wrong in chem class, and I can't figure it out, can someone please help?
How many calories are in 5 large eggs if one egg contains 6 grams of fat and 6 grams of protein?Carbohydrate = 4kcal/gFat= 9kcal/gProtein = 4kcal/gAnswer: a) 400 calb) 4 calc) 80 cald) none of the... more
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07/11/20

Chemistry Buffer/titration problem
Hello,I am having trouble with this problem. I think I have part a) using the Henderson-Hasselbalch equation but part b) and c) are confusing me. I know I need to set the pH=7 and rearrange the HH... more
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07/09/20

high school stoichiometry
If 6.3g of NaHCO3 are added to 15.0g of CH3COOH solution,the residue of the reaction is found to weigh 18.0g. what is the mass of CO2 released in the reaction.
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07/05/20

Chemistry Help please! Iodine Clock experiment
Calculate the concentration of KIO3 in the final mixture for each of your dilutions. Remember that the origional KIO3 was 0.200M and that the original dilution, when mixed with 10 mL of solution B,... more
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07/05/20

Stoichiometry Question
How many moles of ammonia (NH3) can be produced from 2.85 grams of nitrogen gas according to the following reaction? N2(g)  + 3H2(g)  --> 2NH3(g)
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07/05/20

what percentage of the acid is not ionized?
A weak acid, HA, has a pKa  of  4.810. If a solution of this acid has a pH of  4.763, what percentage of the acid is not ionized? Assume all  in the solution came from the ionization of HA.
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07/05/20

What is the percent ionization of a 0.183 M solution of this acid?
The Ka of a monoprotic weak acid is 0.00282. What is the percent ionization of a  0.183M solution of this acid?
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07/02/20

please need help in this chemistry question with a reasonable explanation
You heat 3.854 g of a mixture of Fe3O4 and FeO to form 4.148 g Fe2O3. The mass percent of FeO originally in the mixture was: A) 92.9% B) 55.8% C) 44.2% D) 38.5%
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