Density Lab
mtwoorf6
density_datasheet.rtfLab Report – Mass, Volume and Density
Your Name:
Directions: Type your answers on this document. It's helpful if you can bold, italicize, underline or color your answers. You can save this as .docx or .pdf if you prefer (or .rtf is ok.) Then upload it to the Density Lab dropbox online.
Table I - Measurement of Water
Volume of water
Table II – Measurement of Solid Object (Object used: __________________)
Mass of beaker
Mass of beaker + object
Mass of object after subtraction
Mass of object alone after taring beaker
Part II Questions
Did you get the same result for either method of finding mass? If you didn't, should you have?
Table III – Density of Solid Objects (Do this for TWO different objects)
Object 1: ______________________
Mass of beaker
Mass of beaker + object #1
Mass of object #1
Volume of water
Volume of water + object #1
Volume of object #1**
Density of object #1 Please show your work
Object(s) 2: ___________________________
Mass of beaker
Mass of beaker + objects #2
Mass of objects #2
Volume of water
Volume of water + objects #2
Volume of object #2 **
Density of object #2 Please show your work
**Be careful here, this requires a little math step. (How would you calculate the volume of just the object? Look at the two lines of data above this line).
Watch out for sig. figs. in your calculations. Check that you have the correct sig fig in your mass, volume, and density measurement and calculations .
Part III Questions - Density of Solid Objects
1. What is wrong with this statement? "If the density of 1 paper clip is 1.5 g/mL, the density of 2 paper clips is 3.0 g/mL."
2. For your second objects that was singly less than 5 grams, why did we use multiple objects instead of just 1 of the object? (i.e. why did you get better results by using many of the same item instead of just 1 of the low mass item?)
3. If you placed each object, #1 and #2, in vegetable oil, would each object float or sink and why? (Density of vegetable oil is 0.89 g/ml).
Table IV – Density of Liquids
Density of Rubbing Alcohol, calculated with 3 different amounts
Volume solution
Mass solution
Density solution
Part IV Questions – Density of Solutions
1. You probably had a little variation in the values for density. What happened during the exercise that could have accounted for the variation? (Consider your technique, any problems you had, limitations on the equipment you used to measure the substances. NOT calculation errors because if you say, "my math may be wrong," then first go double check your math! Be specific. Do not just say "measuring errors" - exactly what could account for the variation?)
2. Aside from a little variation in the values, does your data support the statement made earlier in this exercise that density is an intrinsic (fundamental) property of a substance? If it does, give supporting evidence from your table. If it does not, look for possible reasons why it doesn’t. (Hint: whether your results support the statement depends on whether you got the same or different density for the different volumes of solution within experimental error.)
Part V Questions – Layering of Liquids
1. Describe what the final result of the liquids in the glass looks like. Indicate which liquid is at the bottom, middle, top, etc. Also make a note if you had any mixing of the layers.
2. Why do the liquids stay separated? List at least 2 properties (factors) that differ in each of the liquids that helped the liquid stay separated. (If you get stuck here, take a look back at the beginning of the lab exercise and look up on the internet about how oil and water interact with each other).
3. Stir up the liquids in the glass and watch what happens to the layers. Make observations immediately after stirring and again after allowing the glass to sit for a few minutes. Note whether the layers mixed with each other and if they stayed mixed or separated back out after the glass was allowed to sit.
KEEP GOING….One more question to go!
Final Overall Assessment Question: Describe the procedure you would use (including any equipment or glassware) to measure the density of vinegar in a chemistry lab. Be specific in your procedure, explaining exactly what you would do so that anyone could follow it. [You don't have to do this - just explain what you would do.]
