304 Answered Questions for the topic Chemistry Lab

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?
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
Chemistry Lab Biology Tutor

10/12/17

volume of PCR , is this right?

Reagent stock concentration             Required final concentration                Volume10X Buffer                                                       1X                                       5... more
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?
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
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?

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
Chemistry Lab Chemisty

10/05/17

Percent Composition

Calculate the percent composition of each element, by mass, in Na2CO3*10H2O
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
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

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?
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.
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
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
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?
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?
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
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 
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
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?
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?
Chemistry Lab

09/08/17

GC-MS analysis

What do you need to screen anabolic androgenic steroids in a single GC-MS analysis?
Chemistry Lab

09/05/17

When using a Bunsen burner and ring clamp, always use the "Three Finger Rule". Explain why this rule exists.

When using a Bunsen burner and ring clamp, always use the "Three Finger Rule". Explain why this rule exists.

Still looking for help? Get the right answer, fast.

Ask a question for free

Get a free answer to a quick problem.
Most questions answered within 4 hours.

OR

Find an Online Tutor Now

Choose an expert and meet online. No packages or subscriptions, pay only for the time you need.