True or False

The citric acid cycle consumes more energy than it produces.

The magnesium in a series of soil samples was characterized by atomic absorption spectrometry (AAS). The instrument was calibrated with a series of standards: 0, 50.00, 100.00, 250.00 mg/L MgSO47H2O. These samples produced average instrument readings of 0.005; 0.192 ; 0.401 ; and 0.993. Triplicate analysis of an unknown yielded instrument readings of 0.328, 0.340, 0.335. What is the average concentration and standard deviation of the unknown? Report your answer as ppm Mg. THE OPTION IS NOT 211

what is the boiling point of Hoveyda-Grubbs 2^nd Generation Catalyst?

Chapter 19, Question 2Determine the oxidation state of the transition metal in each compound.

a) NiSO4

b) KMnO₄

c) (NH₄)₂WO₄

d) What is the oxidation state of Pb in PbCrO₄?

e) What is the oxidation state of Cr in PbCrO₄?

f) ZrOCl2.8H2O

PLease Answer all parts of the following:

a) The recommended daily allowance of calcium for men between the ages of 19 to 50 is 1 000 mg Ca. Three multivitamin tablets are analyzed for calcium gravimetrically with the precipitation of calcium cation by oxalate anion. If the mass dry calcium oxalate obtained is 2.0136 g, how many tablets must a man take in a given day to meet the recommended daily allowance? Ca²⁺(aq) + C₂O₄²⁻(aq) ==> CaC₂O₄ (s)

b) Aqueous lead precipitates when mixed with aqueous carbonate.

Pb²⁺(aq) + CO₃²⁻(aq) ==> PbCO₃(s)

If 5.000 g Pb(NO₃)₂and 2.500 g Na₂CO₃are mixed in water, which ion is the limiting reactant? What mass PbCO₃is precipitated? (PbCO₃= 267.21 g/mol, Pb(NO₃)₂= 331.2 g/mol, Na₂CO₃= 105.9888 g/mol)

Write a balanced equation for the oxidation of Co(II) to Co(III) by hydrogen peroxide. Why is this oxidation process assisted by the presence of ammonia?

What is the identity of 51g of a gas in a 24.5L container at 25.0oC and 1.5atm?

There are two possible methods for recovering copper from a solution of copper (II) sulfate, one uses precipitation and the other uses redox.

Copper(II) ions can be precipitated as copper(II) carbonate.

CuSO₄(aq) + Na₂CO₃(aq) → CuCO₃(s) + Na₂SO₄(aq)

How many mL of 0.495 M Na₂CO₃ would be needed to precipitate all of the copper ions in 70.3 mL of 0.790 M CuSO₄?  mL

How many grams of CuCO₃(s) would be formed from the copper ions in 70.3 mL of 0.790 M CuSO₄?   g

100 mL of a saturated solution of magnesium palmitate, Mg(C16H31O2)2, is prepared at 25 °C. The Ksp is 3.3 × 10^-12 . To this solution is added 0.015 g of magnesium palmitate and the temperature is raised to 50 °C. The Ksp is 4.8 × 10^-12. How much of the solid magnesium palmitate remains?

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I understand that the lower the Ksp, the less soluble a compound (lower molar solubility). I have a final on tuesday morning and would like to learn how to approach this question. Thanks so much!

Question 7 (1 point)

When zinc is reacted with copper (II) chloride to produce zinc chloride and copper, which element (if any) is oxidized? Which element (if any) is reduced?

Question 7 options:

Question 8 (1 point)

When ethane (C₂H₆) is combusted, which element (if any) is oxidized? Which element (if any) is reduced?

Question 8 options:

Question 9 (1 point)

When calcium chloride reacts with sodium carbonate to produce sodium chloride and calcium carbonate, which element (if any) is oxidized? Which element (if any) is reduced?

Question 9 options:

A 1.268 g sample of a metal carbonate (MCO3)was treated with 100.00 mL of 0.1083 M sulfuric acid (H2SO4), yielding CO2 gas and an aqueous solution of the metal sulfate (MSO4). The solution was boiled to remove all the dissolved CO2 and was then titrated with 1.241×10⁻² MNaOH. A 91.86 mL volume of NaOH was required to neutralize the excess H2SO4.

A) What is the identity of the metal M?

B) How many liters of CO2 gas were produced if the density of CO2 is 1.799 g/L?

2. Which mechanistic types can undergo a reaction on a primary carbon?

a) E1

b) Sn2

c) Sn1

d) E2

Calculate the theoretical and percent yield. What is the limiting reagent?

Reaction: 4-bromoacetanilide from acetanilide in Br2 and AcOH

4.27 g acetanilide

4.78 mL bromine solution

15.93 mL glacial acetic acid

product: 0.24 g 4-bromoacetanilide

Describe the process of protein synthesis starting with DNA in the nucleus and ending with proteins released from the ribosomes. Include the role of the DNA, mRNA, tRNA, rRNA and amino acids.