321 Answered Questions for the topic Chemistry Lab

Chemistry Lab

10/18/17

Can Flame Test identify any unknown element?
 Explain why or why not
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10/17/17

Chemistry Paper Chromatography
A chemist wishes to separate and identify a mixture of substances using paper chromatography. The diagram shows the apparatus used. The solvent is water.The solvent front is allowed to reach the... more
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Chemistry Lab Chemistry

10/16/17

Ion exchange column estimate
The question is: Suppose another student attempts to do an ion exchange on a column that is already nearly saturated with Co2+ and Zn2+. Will his calculated % Co be high or low?
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Chemistry Lab Organic Chemistry

10/15/17

Provide the chemical reaction being demonstrated in the experiment. it should include the starting materials, reagents, and products.
Procedure:1) Accurately weigh approximately 0.40 g of Dimethyl maleate into a 50 mL round bottom flask that possesses a ground glass joint, and record the weight.2) Dissolve the Dimethyl maleate in... more
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Chemistry Lab Biology Tutor

10/12/17

volume of PCR , is this right?
Reagent stock concentration             Required final concentration                Volume10X Buffer                                                       1X                                       5... more
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Chemistry Lab

10/11/17

Compare the reactions of CuCI2 and HCI with AgNO3.
 Compare the reactions of CuCI2 and HCI with AgNO3. Propose a hypothesis to account for the reaction product. Hint: What is the likely chemical formula for the product?
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Chemistry Lab

10/11/17

How can this lab illustrate this fact
person is slightly denser than water. Life preservers are made of low density materials.  The average density of a person plus a life preserver is less than density of water- so together they will... more
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Chemistry Lab

10/11/17

what process must be performed during clean up; filtration, distillation or chromatography? Why?
What process must be performed during clean up: filtration, distillation or chromatography? Why?
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10/05/17

When compound A is partitioned between equal volumes of methylene chloride and water
When compound A is partitioned between equal volumes of methylene chloride and water one finds that the partition coefficient is equal to 1. This means that the compound happens to be equally... more
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Chemistry Lab Chemisty

10/05/17

Percent Composition
Calculate the percent composition of each element, by mass, in Na2CO3*10H2O
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Chemistry Lab Dna

10/02/17

where do you think the bacterium that produces HindIII is found?
The optimal working temperature for the restriction endonuclease HindIII is 37°C
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Chemistry Lab

09/30/17

Molar abosrptivity
Calculate the molar absorptivity 1. Blue Dye (concentration 40mg/L) (Peak/ λmax is 630) 2.  Red Dye (concentration 60mg/L) (Peak/ λmax is 520) 2. Red Dye (concentration 70mg/L) (Peak/ λmax is... more
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09/26/17

Recrystallization problem! ORGANIC CHEMISTRY
200 mg of impure sucrose was weighed out. After recrystallization from water, 225 mg of solid compound was obtained. What happened? How can this be corrected?
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Chemistry Lab

09/24/17

toad, has a mass of 13.6 kg. Trevor jumps into a large cylinder containing water. The water level rises 2.50 L. What is the density of the toad?
What is the density of the toad?Express your answer in kg/L.
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Chemistry Lab Chemistry Calcium Oxalate

09/24/17

why the change in the calcium oxalate equilibrium is produced?
We hace experimented with calcium oxalate and i have some observations that could help: First, we made a solution with 5mL of calcium chloride 0,1 M and 5 mL of sodium oxalate 0,1 M. this solution... more
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Chemistry Lab

09/20/17

A mixture weighing 30.500 g contained 8.500 g NH4Cl, 21.250g SIO2, with the remainder being NaCl. Find the percent, by weight, of each component.
this is for my chem lab
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Chemistry Lab

09/18/17

what percentage of the mixture is a salicylic acid if 1.94 g of the acid was isolated from 12.1 g of the mixture?
find the percentage
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Chemistry Lab

09/17/17

What is the concentration
What is the concentration (in mol L-1) of 12.5 mg of each of disopyramide phosphate and lidocaine hydrochloride dissolved in 250 mL?
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Chemistry Lab

09/17/17

Chemistry question
If 20 mg of a drug is dissolved in 250 mL of solvent, how many mg of the drug are present in 5 mL of that solution?
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Chemistry Lab Chemistry

09/16/17

Possible Freezing Point Measurement Error
The freezing point of pure water was measured to be 0.18 to 0.20 degrees Celsius, The accepted freezing point of water is 0 degrees Celsius. What possible reasons could be the why I got this error... more
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Chemistry Lab

09/14/17

determine the volume of 1.0 teaspoon. 1 tablespoon=3teaspoons; 1tablespoon=1/2 fluid ounce
question #3 on pg49 of chemistry lab book 
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09/14/17

i walk at a speed of 4.50 ft/second, how many hours would it take me to travel 8.00x10^15 picometers?
I got 1.62 hours is the right ?
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Chemistry Lab

09/11/17

Calculate required volume...
Calculate the required volume of Stock 2 (20 mg/mL of ethanol) that you will need to add to each of five volumetric flasks so that when diluted to 100 mL each will yield the desired ethanol... more
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Chemistry Lab

09/10/17

Chemistry question
If a standard drink is defined as 10 g of alcohol, what volume of 38 % vodka corresponds to 1 standard drink? How many standard drinks are them in 150 mL of 8.8 % Sauvignon Blanc?
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Chemistry Lab

09/10/17

Chemistry question calculation
If you are provided a stock solution of 15 mg/L of ethanol how much of this solution would you need to transfer to a 50 mL volumetric flask to produce a solution of concentration 1 mg/L?
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