Initial 1 cm
1.3 cm
211 cm
2.70 g
2.73 cm3 0.989 g/cm3
After 8 hours
2.5 cm
212 cm
4.5 cm
11.90 g
24.75 cm3 0.481 g/cm3
Difference
-1.5 cm
0.9 cm
2.4 cm
9.29
-22.02 cm3 0.508 g/cm3
Exercise 4 Post-Lab Questions
1. What type of property of matter is density? Does it depend on the amount of matter
present?
2. Compare the initial and final density of the gummy bear. Was the change in density
influenced more by a change in mass or a change in volume?
3. How would you expect the density of the gummy bear to change if you soaked it in
isopropanol (rubbing alcohol, density = 0.79 g/cm) instead of water?
4. How would you expect the density of the gummy bear to change if it were only soaked
for 4 hours? Explain your reasoning based on your observations after 8 hours.
Ok

In a laboratory experiment, a fermenting aqueous solution of glucose and yeast produces carbon dioxide gas and ethanol. the solution was heated by burning natural gas in a bunsen burner to distill the ethanol that formed in the flask. during the distillation, the ethanol evaporated and then condensed in the receiving flask. the flame of the burner was kept too close to the bottom of the flask and some of the glucose decomposed into a black carbon deposit on the inside of the flask. during this experiment the following changes occurred. which of these changes involved a physical change and not a chemical change? check all that apply. 1-condensation of ethanol 2-evaporation of ethanol 3- formation of carbon dioxide gas from glucose burning of natural gas 4-formation of ethanol from glucose by yeast 5-formation of a carbon deposit inside the flask

Which set of characteristics best describes igneous rock? a) largest type of rock, made of organic matter, hardest type of rock b) least abundant type of rock, made of other rocks, made mostly of minerals c) found on all continents, contains wavy bands of stripes, contains fossils d) most abundant type in earth's crust, made of magma/lava, contains no fossils

Which of the following would be an accurate picture of the earth during the summer time of the northern hemisphere?