294 Answered Questions for the topic Chemistry Lab

Chemistry Lab Chemistry Conversion

03/03/15

why are only four lines visible for hydrogen when calculations show many possible emission lines?

why are only four lines visible for hydrogen when calculations show many possible emission lines?
Chemistry Lab

03/02/15

Please help me solve this and show me how you got the answer. Thank you!

A student prepared aspirin using 2.019 g of salicylic acid and 5.2 ml of acetic anhydride (d=1.08g/ml) 1. Which reactant is limiting? salicylic acid or acetic anhydride 2. What is the theoretical... more
Chemistry Lab

02/16/15

how do you determine what washers are made from

10 washers
Chemistry Lab

02/10/15

a mixture contains 24.5%, 52.8%, the remainder being component c. if you have 35.0 g of this mixture, how many grams of each component are there?

a mixture contains 24.5%, 52.8%, the remainder being component c. if you have 35.0 g of this mixture, how many grams of each component are there?   chemistry lab question
Chemistry Lab

02/01/15

why should mass be determined by difference rather than by taring the balance

why should mass be determined by difference rather than by taring the balance

01/14/15

Calculate the moles of NaCl in the following aliquot...

a solution was prepared adding 23.512g of NaCl to enough water to obtain 250.00mL of solution. A 10.0mL aliquot of the solution was taken. Calculate the moles of NaCl in the aliquot. 
Chemistry Lab Enthalpy

12/30/14

what is a good experiment used t suggest if NaCl or KCl has a higher lattice energy

i have to design an experiment to determine whether sodium chloride or potassium chloride has a higher lattice energy and show calculations to prove the experiment can be used

Moles and grams...so confused

I have muddled through this worksheet but I don't think my work is correct.  Could someone walk me through this so I understand how to do these types of problems?   1.Consider the following... more

Mass of NaOH needed to make 500mL of 0.1M NaOH solution?

I'm working on a solutions lab and would like someone to look over my calculations please.   The question asked: "What mass of solid NaOH is needed to make 500mL of 0.1M NaOH solution?"   My... more

Chemistry Question, I need some help please

This question is about the reaction 4HCl(g)+O2(g)-->2H20(g)+2Cl2(g)A) Using the values of ΔfH°, find the standard heat of the reaction of this reaction.B) Using average bond energies, estimate... more

Chemistry Lab, Calculated Concentration Problem. I really need help!!

If there was an impurity in KHP, how would the concentration of the KHP solution differ from that calculated?   Would the calculated concentration of the KHP solution would be higher/lower/ or... more
Chemistry Lab Chemistry

11/11/14

Pressure and volume lab...very confused

I'm working with the calculations for a lab to measure pressure in a controlled environment.   The first table's text instructs:  "Convert mL to L and 1/L and calculate."    The Data appears as... more
Chemistry Lab

11/11/14

How do you find the number of C and O atoms in a hydrocarbon when it says it weighs 88 g/mol?

How do you find the number of C and O atoms in a hydrocarbon when it says it weighs 88 g/mol?
Chemistry Lab Chemistry Heat Energy

11/07/14

Chemistry problem please help!

If a cup of tea (190.0 ml, 86.0 celcius) is cooled by adding an ice cube (30.0 g, -10.0 celcius), what is the final temperature of the tea? The heat required to melt ice (heat of fusion) is 80.0 cal/g more
Chemistry Lab Chemistry Heat Energy

11/07/14

Chemistry problem energy, I don't know where to start!

A metal sample weighing 220. g is heated to 95.0 Celsius and then placed into 190. ml of water at 46.6 celcius. the final temperature of the water is 51.6 celcius. How much heat was transferred... more
Chemistry Lab Chemistry Stoichiometry

10/31/14

Chemistry problem I am stuck! Please help!

If .240 g of an unknown triprotic acid (H3X) requires 18.00 mL of a .500 M NaOH solution for neutralization, what is the molecular weight of the acid? If it is a common phosphorous containing... more
Chemistry Lab

10/28/14

What does it mean if the percent purity of a synthesized aspirin is 100% and the commercial is 90%?

What have I done wrong
Chemistry Lab Chemistry

10/09/14

In the reaction of colorless solutions of cobalt(III)

In the reaction of colorless solutions of cobalt(III) chloride and ethylenediamine(C2H8N2) a dark orange solution is formed.The reaction proceeds:CoCl3 + 3NH2CH2CH2NH2 → 2HCl +... more

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