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.

6) Calculate the wavelength of an electron, in pm, when its velocity is 2.9978 x 106 m/s.

A digital watch draws 0.230 mA of current provided by a battery whose net reaction is:

HgO(s) + Zn(s) ----> ZnO(s) + Hg(l)

If a partially used battery contains 0.350 gm each of the four substances for how many more hours will the watch run? Hint: First determine the limiting reagent.

Gold has a density of 19.3 g/cm^3. Current price is $1192 per troy ounce. What is the value of a cube of a gold with a side length of 1 inch? (1 troy ounce = 31.1g) (2.54cm=1inch)

At the end of 2012, global population was about 7.0 billion people. What mass of glucose in kg would be needed to provide 1500 cal/person/day of nourishment to the global population for one year? Assume that glucose is metabolized entirely to CO2(g) and H2O(l) according to the following thermochemical equation:

C₆H₁₂O₆(s)+6O₂(g)⟶6CO₂(g)+6H₂O(l)

ΔH∘=−2803kJ

calculate the mass defect and nuclear binding energy per nucleon (in mev) for c-16, a radioactive isotope of carbon with a mass of 16.014701 amu.

HOT COFFEE:

Your breakfast restaurant needs to buy a container to hold coffee. Generally, restaurants wish to have container that can either quickly cool the coffee to a drinkable range, and/or keep the coffee in that drinkable range for as long as possible. Quite often, one container is not the “best” at achieving both of these outcomes.

From the three container models provided, recommend the container that provides the best solution for your restaurant. (Think about situations where you may want the coffee to cool to the drinkable range sooner or situations where you would want the coffee to stay in the drinkable range longer)

Project Information:

The drinkable range for coffee is considered to be between 130°F to 110°F. Coffee is brewed at 212°F.

Here are the three models of containers:

Calculations

 Your math work does not need to be typed, that can be written by hand, but it should be done neatly.

 Graphs MUST be printed out using TI-Connect software for the TI calculator or some other graphing software. (This is available in the Math Centers)

 If you solve graphically, then you’ll need to include additional graphs showing how you arrived at the solution

For each of these containers, provide these calculations:

First, you need to find the k value for EACH container. (three separate problems)

Use Newton’s law of cooling: u(t)=T +(u0 -T)e^kt

 u(t) is your temperature after time t, in minutes;

 T is the temperature of the surrounding medium (as in air temperature in

the room);

 u0 indicates the initial temperature;

 k is the constant (which in this case should be negative, since the

temperature is cooling

 For finding k, use and initial temperature of 200°F.

Use the value k to set up the particular variation of the cooling function, u(t), for

each model of container.

Next, figure out how long it takes the containers to cool the coffee to the upper

level of the “drinkable” range (130o) – (For this and the next, use an initial temp of

212°F.)

Then, figure out the time it takes to get to the lowest level of the drinkable range

(110o).

Please show a graph for each container. The graph should contain a function for

the container and show the intersections with 130 o and 110 o temperatures in an appropriate window.

 There should be entries in Y1= u(t) , Y2=130, and Y3=110.

MAT 195 Precalculus Eng/Sci Newton’s Law of Cooling Project

6. Please type a paragraph explaining why you chose a particular container – citing your math facts. Include a summary table. (see instructions above)

Summary Page

 Write a short paragraph describing the customer base at your coffee shop and more importantly their coffee drinking habits. (Are they retirees, students, commuters? Are they lingering in the shop and getting frequent refills or taking it to go? The way in which they drink their coffee should inform your choice for a container.)

 Create a table summarizing the results of your calculations. For each container include the time it takes for the coffee to reach a drinkable temperature and how long the coffee remains in the drinkable range.

 Based on your calculations choose the model which will be best suited for your restaurant. Write a short paragraph explaining in detail why you believe the model you chose is the best model for your restaurant keeping in mind your customer base.

1)Calculate the molarity of each of the following solutions.

0.30 mol of LiNO3 in 6.32 L of solution

Express your answer using two significant figures.

2)

What is the net ionic equation of the reaction of MgSO4 with Ba(NO3)2?

Express you answer as a chemical equation including phases.

3)

Part A

Enter the complete ionic equation to show the reaction of aqueous lead(II) nitrate with aqueous potassium sulfate to form solid lead(II) sulfate and aqueous potassium nitrate.

Express your answer as a chemical equation. Identify all of the phases in your answer.

Enter the net ionic equation to show the reaction of aqueous lead(II) nitrate with aqueous potassium sulfate to form solid lead(II) sulfate and aqueous potassium nitrate.

Express your answer as a chemical equation. Identify all of the phases in your answer.

4)

Part A

Write balanced molecular equation for the reaction between nitric acid and calcium hydroxide.

Express your answer as a chemical equation. Identify all of the phases in your answer.

Part B

Write net ionic equation for the reaction between nitric acid and calcium hydroxide.

Express your answer as a chemical equation. Identify all of the phases in your answer.