How Can I Improve My Skills in Solving Chemistry Word Problems?

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Discussion Overview

The discussion revolves around improving skills in solving chemistry word problems, particularly those involving concepts like molality, molarity, and dimensional analysis. Participants share their experiences with these types of problems and seek advice on strategies for better problem-solving.

Discussion Character

  • Exploratory, Homework-related, Technical explanation

Main Points Raised

  • One participant expresses difficulty in solving chemistry word problems despite having a good theoretical understanding and seeks steps or recommendations for improvement.
  • Another participant suggests estimating the answer before calculations and checking dimensions and units to ensure consistency, particularly in relation to grams and kilograms.
  • A participant presents a specific problem involving the calculation of molality from given density and molarity, indicating a need for guidance on manipulating units.
  • In response, another participant proposes using the formula for nitric acid to determine mass and then calculate moles per liter using density.

Areas of Agreement / Disagreement

Participants generally agree on the importance of estimation and unit consistency in solving chemistry problems, but the discussion remains unresolved regarding specific strategies for manipulating units in the context of the presented problem.

Contextual Notes

Participants have not fully explored all assumptions related to the calculations, and there are unresolved steps in the manipulation of units for the specific problem presented.

Who May Find This Useful

Students struggling with chemistry word problems, educators looking for insights into common student challenges, and anyone interested in improving problem-solving skills in chemistry.

john16O
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when is comes to theory in chemistry I have a good understanding. But when it comes to word problems such as molality, %mass, dimensional analysis, molarity, etc. i tend to get these question wrong. I do not know if it is because I am not a very good problem solver but I cannot seem to get these types of questions right on the test. and then when I go to my professor and she explains to me how to solve one, i say to myself, 'why didn't i think of that?', but i never have an answer to that question. So i was just wondering if someone could offer up a couple steps that they go through when solving these kinds of problems. or recommendations on how I could improve my skills in this area. Thank you to everyone for your help in advance!
 
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Have an estimate of what the answer should be before you start putting numbers into a calculator. If the atomic mass of Sodium is 20 something and chlorine is 30something then 0.1mol of sodium chloride better come out to a few grams, if you get an answer like 30kg you probably have somethign upside down.

Check dimensions. If a number is given in g/mol and you want an answer in moles then the g/mol number must be on the bottom of the equation.

Check units - masses are given in grams but everything else is in meters/kilograms. Especially with gas laws check that you have grams / kg consistently.
 
ah i see, but how would I approach a problem like this one:

commercial aqueous nitric acid has a density of 1.42 g/mL and is 16 M. Calculate the molality of this solution.

-I know what molality is: moles of solute/kg of solvent. but how do i manipulate these unites to get them into that format? you know what i mean?
 
I would assume they want moles/litre.
You know the formula of Nitric Acid so you can work out the mass, you then know the moles/g, you have the density so can work out the moles/litre.
 
ah! i see thank you!
 

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