# Labpaq Lab Techniques and Measurements Essay

Words: 1518
Pages: 7

Title: Observations of Chemical Changes
Purpose: To learn about the international system of units (SI), to become familiar with common lab equipment and techniques, to gain proficiency in determining volume, mass, length, and temperature of a variety of items using common laboratory measurement devices, to learn to combine units to determine density and concentration, and to use laboratory equipment to create serial dilutions and determine the density and concentration of each dilution.
Procedure: Measure the volume, mass, length and temperature of a variety of items. Create dilution of sugar water.

Data Tables and Observation: Fill out the data sheet (below) for the experiment and submit with this form. Recording data carefully
Show work for full credit. (2 points)

Questions and Problems: ( 6 points)

1. Review your notes and list the potential errors or difficulties you had during this experiment. In other words, which steps would you repeat to improve your confidence?

I would measure the magnet more carefully, I would choose a different string than I used this time, and I would take better, clearer notes on the experiment.

2. If your measured volume of the bolt was too small, how would that affect the density value? Please explain.

If it were too small it would make it seem as if there were more mass in a smaller amount of space and would make it seem way more dense than an accurate measurement.

3. What is the relationship between mL and cm3?
They are equal.

4. The specific gravity of urine is an important piece of information for health care providers. Define specific gravity and note how specific gravity relates to density?
Specific gravity is the density of an object compared to water as a standard. It is numerically the same as density, but specific gravity has no units.

5. Weigh 1 teaspoon of sugar. Use this mass as a unit factor and calculate the number of teaspoons in a can of non-diet soda pop. If you don’t have a can of pop, look for the grams of sugar listed on a can in the store or on the web. Use the unit factor method and set up a table.
1 tsp sugar= 4.2 g

1 can Dr. Pepper= 40 g