321 Answered Questions for the topic Chemistry Lab

Chemistry Lab

01/29/18

How many gm/mL of glucose and water are in 500mL of a 5.3% glucose solution?
This is a measurement lab for cell and molecular biology, however preparing concentrations by using w/v%, v/v, etc.
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Chemistry Lab Chemistry

01/29/18

When a student mixed 46.1 mL of 0.100 M NaOH with 50.0 mL of 0.100 M HCl, they found that 144.5 J of energy was produced.
Based on these results, what is the molar heat of reaction in kJ per mole?
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Chemistry Lab

01/29/18

If you mix 45.4 mL of 1.000 M NaOH with 45.4 mL of 1.000 M HCl, what is the concentration of NaCl(aq) in the resulting solution? Report your answer to one deci
Help, I do not know where to even begin with this question! Due in less than 2 hours!
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Chemistry Lab Rounding Decimals

01/28/18

How do you round .47 to the ones place?
Would it be 0 since the four is less than 5? Or would the 7 round up the 4 which would then make it 1? 
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01/22/18

Hi! Are Delta Hsolution and Delta Hreaction the same value in dissolution?
Hi! Are Delta Hsolution and Delta Hreaction the same value in dissolution? Please help! I know qrxn and qsolution are opposite(signs). I'm confused as to if DeltaHsolution and DeltaHreaction are... more
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Chemistry Lab

01/04/18

Calculate the mass of 4.5×10^ 8 molecules of nitrogen
Calculate the mass of nitrogen molecules give the molar number
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12/17/17

Can you tell from the formula of a substance whether the bonds are likely to be ionic or molecular in nature?
is it possible, or is it not? WHY?
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12/12/17

A Zn wire and Ag/AgCl reference electrode (E° = 0.197 V) are placed into a solution of ZnSO4.
A Zn wire and Ag/AgCl reference electrode (E° = 0.197 V) are placed into a solution of ZnSO4. The Zn wire is attached to the positive terminal and the Ag/AgCl electrode is attached to the negative... more
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12/11/17

A Zn wire and Ag/AgCl reference electrode (E° = 0.197 V) are placed into a solution of ZnSO4.
A Zn wire and Ag/AgCl reference electrode (E° = 0.197 V) are placed into a solution of ZnSO4. The Zn wire is attached to the positive terminal and the Ag/AgCl electrode is attached to the negative... more
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Chemistry Lab Chemistry

12/04/17

Preparing 5 dilutions of 0.200M NiSO4?
I’m supposed to be preparing five dilutions from 50.0 mL of 0.200M NiSO4 stock solution. Instructions say that I will need standard solutions with five different concentrations and all standards... more
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Chemistry Lab Chemistry

12/02/17

Preparing 5 dilutions of 0.200M NiSO4?
I’m supposed to be preparing five dilutions from 50.0 mL of 0.200M NiSO4 stock solution. Instructions say that I will need standard solutions with five different concentrations and all standards... more
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12/02/17

Galvanization
I'm a little confused on how to find the mass of zinc consumed from the data: Mass of zinc produced: .745g Mass of Zinc electrode before 7.705g Mass of Zinc electrode after 8.450g Length of... more
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Chemistry Lab Science Chemistry Lab

11/30/17

We can prepare oxygen gas by decomposing hydrogen peroxide. There are many other chemical reactions that generate gases as one of their products.
Lets consider the reaction between zinc metal and hydrochloric acid as such an example. Write a procedure that explains how you would collect the gas produced from this reaction in the laboratory.
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11/29/17

chemistry help
Calculate the emf of the voltaic cell: Concentration of Mg+2 (anode)  is 0.00100 M and Fe+3 (cathode) is 0.100 M   unsure how to find this
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Chemistry Lab Chemistry Spectrometry

11/28/17

Effects of changing concentration of a solution?
If you change the concentration of a solution, will the molar absorption coefficient change? why?
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Chemistry Lab

11/25/17

indicating the total number of ions present in a solution
Chemical Formula of Salt NaI Cation Na+  Anion I- What is the total number of ions in 1.0 L of a 1.0 mol/L solution 
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11/14/17

chemistry prelab question
Potassium permanganate (KMnO4) is the oxidizing agent and sodium oxalate (Na2C2O4) is the reducing agent.a. Manganese (Mn) is reduced.b. Carbon (C) is oxidized.   2KMnO4(aq) + 5Na2C2O4(aq) +... more
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Chemistry Lab

11/04/17

Question dealing with gravimetric analysis lab.
Approximately how many mL of 5% BaCl22H2O solution would be required to precipitate all the sulfate if we assume that your samples are pure sodium sulfate? Assume that the density of the barium... more
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11/01/17

Refractive Index - ORGANIC CHEMISTRY LAB
A student attempts to separate a sample of cyclohexane and ethylbenzene by distillation. After the distillation the student obtains an n 20D of 1.4355 for what should be pure cyclohexane with a... more
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10/31/17

Tea contains about 3% caffeine by mass. Assuming each tea bag contained 2.25 g of tea, did you recover the expected amount of caffeine from two tea bags?
So what is the expected amount of caffeine? Is it 0.0675g or is it 0.135g?  In lab, I recovered 0.018g of caffeine
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Chemistry Lab Chemistry

10/28/17

why is it that we can obtain a Raman spectrum
If vibrational transitions correspond to energies in the IR region of the electromagnetic radiation, why is it that we can obtain a Raman spectrum by using a visible wavelength laser as a light... more
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Chemistry Lab

10/23/17

Data Table 4: Reaction of Rocks with Hydrochloric Acid
This is from a lab about acid rain
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Chemistry Lab Forensic Scence

10/22/17

presumptive luminol test
  What role does the hydrogen peroxide play in the reaction? A: Is it the the oxidizing agent and blood in the catalyst?   How would you describe to jury about the scientific basis for this test.
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Chemistry Lab Math Science Chemistry

10/20/17

How do I calculate the pressure in a 12.2L vessel that contains 2.34g CO2, 1.73g SO2, and 3.33g Ar at 42 degrees Celsius?
Can you please help me with this problem? Thanks
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Chemistry Lab Science Chemistry Physics

10/20/17

I am struggling with this AP Chemistry word problem
A 255mL round-bottom flask is weighed and found to have a mass of 114.85g. A few mL of an easily vaporized liquid are added to the flask and the flask is immersed in a boiling water bath. All of... more
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