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Solutions Biology Microbiology Dilution Calculations

04/03/18

You are told to prepare 70% v/v bottle of ethanol to spray down a laminar flow hood.

You are told to prepare 70% v/v bottle of ethanol to spray down a laminar flow hood.The maximum volume on the spray bottle is 250 ml. You have a 95% v/v stock bottle bottle of ethanol. What volume... more

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Solutions Biology Microbiology Dilution Calculations

04/03/18

What volume in ml do you need to prepare 100 ml a 10 mM solution of Tris....

What volume in ml do you need to prepare 100 ml a 10 mM solution of Tris (MWT 121 g/mol) from 500 ml of 0.5 M stock?

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Solutions Biology Microbiology Dilution Calculations

04/03/18

What amount in gram do you need to prepare 25 ml of a 10% w/v solution of Tris (MWT 121 g/mol)?

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Solutions Biology Microbiology Solution Dilution

04/03/18

What amount in grams do you need to prepare 100ml of a 10mM solution of Tris (MWT 121 g/mol)?

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Solutions

03/23/18

4.0 moles of potassium chloride in 0.750 L of solution (water)

molarity equation : moles/liters

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Solutions Chemistry Moles Concentration

03/06/18

Do moles change with volume?

Does increasing or decreasing volume change the moles in a solution, or does that just affect the concentration? If I have 0.035711 moles in 100mL and I'm asked how many moles in 5mL of this... more

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Solutions Calculus Precalculus Equations

02/19/18

Find the solution of the equation: x^3−3x^2+2x−2=0 Approximate your answer to the nearest hundredth.

Find the solution.

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Solutions

01/31/18

Determine the molarity of a solution of concentrated nitric acid.

Determine the molarity of a solution of concentrated nitric acid. Concentrated nitric acid is 70% by mass HNO3. The density of concentrated nitric acid is 1.42 g/ml

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Solutions Freezing Point Depression

01/30/18

What is the freezing-point depression of a solution that contains 0.705 mol of a nonelectrolyte solute in 5.02 kg of water? (Kf = 1.86 °C/m)

Although I understand Chemistry and have been doing well in the class, I just do not understand this problem. Thank you for any help!

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Solutions Trigonometry

12/24/17

Why is x^2-x-1 and x^4-5x^2+5 in x^4+2x^3-6x^2-2x+1?

I was playing around with tan(4*arctan(x))=2 and noticed x^2-x-1 and x^4-5*x^2+5 were in the solutions. It just seemed strange to me. Do identities work on these? Why is it adding/subtracting like... more

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Solutions

12/04/17

What mass of solute must be added to the solution to correct the concentration

A student prepares a 250 ml of 1.35 M solution of magnesium chloride for an experiment. His lab partner accidentally dilutes the solution with an additional 125 ml of water

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Solutions

12/04/17

How would temperature affect the vapour pressure of a non polar solvent

Give example and description

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Solutions

12/04/17

Determine the concentration of dissolved oxygen in the lake in ppm

Dissolved oxygen gas levels in a polluted lake have dipped dangerously low to a concentration of 8.023•10^-4 M

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Solutions

12/04/17

What volume of concentrated acid and what volume of water would be required to create such a solution

Sulphuric acid is sold in standard stock solutions of concentration 14.5M. A teacher needs to prepare 175 ml of a 2.3M solution of sulphuric acid.

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Solutions

11/18/17

You need 350 mL of a 50% alcohol solution. On hand, you have a 25% alcohol mixture and a 60% alcohol mixture. How much of each mixture will you need to obtain t

You need 350 mL of a 50% alcohol solution. On hand, you have a 25% alcohol mixture and a 60% alcohol mixture. How much of each mixture will you need to obtain the desired solution?

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Solutions Solution Set

11/07/17

Use +,-,÷,× with the numbers 2,5,6 to get a total of 14. You can only use the numbers once.

Using the numbers 2,5,6 how can I get a total of 14. You can only use the numbers once.

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Solutions

10/15/17

What are the solutions:

x2+x-12

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Solutions Homework Tips

10/06/17

explain the reason

Explain ‘chemical equilibrium’ and ‘Le Chatelier’s principle’ ,respectively.Now changes of the reaction conditions A or B are given to the chemical reaction eq.①.Which direction does the chemical... more

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Solutions

09/15/17

What is the solution of the system of equations?

Y=3x-4 -3y=-9x+12

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Solutions Math Chemistry Moles

07/20/17

Chemistry; solutions

An experiment calls for 50 mL of a 0.5 M aqueous solution of sodium hydrogen carbonate. Describe how you would make up such a solution?

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Solutions Quadratic Equations Quadratic Formula Negative Numbers

07/13/17

One, Two, or No Real Solution Problem.

How do I know if this has One, Two, or No Real Solution? -3x^2 + 5x - 1 = 0

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Solutions

05/01/17

Calculate the boiling point, in degrees celsius (°C), of a 4.2mole/kg aqueous solution of Al(NO3)3. Assume you are at sea level.

Calculate the boiling point, in degrees celsius (°C), of a 4.2mole/kg aqueous solution of Al(NO3)3. Assume you are at sea level. Round your answer to three significant figures. Include the unit in... more

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Solutions Word Problems Problems

02/21/17

***7. A lab technician has 40% of a 15% iodine solution. How many gallons of a 40% iodine solution must he add to make 20% iodine solution?

I don't know how to do this please help me

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Solutions

02/04/17

what is relation between molarity,molality,mass fraction,mole fraction?

It is from the chapter solutions

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Solutions

02/02/17

The sum of 2 numbers is 65. One number is 4 times bigger than the other number what are the numbers.

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Answers •2

You are told to prepare 70% v/v bottle of ethanol to spray down a laminar flow hood.

What volume in ml do you need to prepare 100 ml a 10 mM solution of Tris....

What amount in gram do you need to prepare 25 ml of a 10% w/v solution of Tris (MWT 121 g/mol)?

What amount in grams do you need to prepare 100ml of a 10mM solution of Tris (MWT 121 g/mol)?

4.0 moles of potassium chloride in 0.750 L of solution (water)

Do moles change with volume?

Find the solution of the equation: x^3−3x^2+2x−2=0 Approximate your answer to the nearest hundredth.

Determine the molarity of a solution of concentrated nitric acid.

What is the freezing-point depression of a solution that contains 0.705 mol of a nonelectrolyte solute in 5.02 kg of water? (Kf = 1.86 °C/m)

Why is x^2-x-1 and x^4-5*x^2+5 in x^4+2*x^3-6*x^2-2*x+1?

What mass of solute must be added to the solution to correct the concentration

How would temperature affect the vapour pressure of a non polar solvent

Determine the concentration of dissolved oxygen in the lake in ppm

What volume of concentrated acid and what volume of water would be required to create such a solution

You need 350 mL of a 50% alcohol solution. On hand, you have a 25% alcohol mixture and a 60% alcohol mixture. How much of each mixture will you need to obtain t

Use +,-,÷,× with the numbers 2,5,6 to get a total of 14. You can only use the numbers once.

What are the solutions:

explain the reason

What is the solution of the system of equations?

Chemistry; solutions

One, Two, or No Real Solution Problem.

Calculate the boiling point, in degrees celsius (°C), of a 4.2mole/kg aqueous solution of Al(NO3)3. Assume you are at sea level.

***7. A lab technician has 40% of a 15% iodine solution. How many gallons of a 40% iodine solution must he add to make 20% iodine solution?

what is relation between molarity,molality,mass fraction,mole fraction?

The sum of 2 numbers is 65. One number is 4 times bigger than the other number what are the numbers.

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Why is x^2-x-1 and x^4-5x^2+5 in x^4+2x^3-6x^2-2x+1?