1. DENSITY QUIZ

2. Question 1 What two instruments would be best to use to measure the density of a Japanese yen? a. Ruler and triple beam balance b. Graduated cylinder and triple beam balance c. Graduated cylinder and ruler d. Guitar and drums

3. Question 2 If a piece of an unknown substance floats on water, what do you know about the substance? a. The substance is plastic b. The substance has a density of 1.0 g/ml c. The substance has a density <1.0 g/ml d. The substance has a density > 1.0 g/ml

4. Question 3 Three liquids are poured into a test tube, and after sitting for a minute, they look like this. What do you know about the liquids? a. The blue liquid is the most dense b. The red liquid is the most dense c. All 3 liquids have the same density d. This is a patriotic test tube

5. Question 4 A miner finds a nugget which he thinks might be gold. He measures the nugget and finds that its mass is 50.0 grams and it displaces 10 ml of water. What is the density of the nugget?

6. Question 5 What was the dependent variable in your bubble gum density experiment?

7. Question 6 What is the independent variable in this hypothesis: “If Sprite is added to the water in a vase containing cut flowers, then the flowers will not wilt as quickly as flowers in plain water because the Sprite carbonation will give the flowers CO 2 for photosynthesis.”

8. Question 7 Which of these is a qualitative observation? a. The bubble gum has a mass of 48.2 grams. b. The bubble gum has a volume of 18 ml. c. The bubble gum tastes like watermelon. d. I love bubble gum!

9. Question 8 Calculate an average density for these three students’ bubble gum measurements: Bob Marley1.8 g/ml Lady Gaga1.6 g/cm 3 Beyonce2.0 g/ml

10. Question 9 Chewing Time (minutes) Density in g/ml Write one sentence summarizing these experiment results.

11. Question 10 (worth 6 points) A research company has developed a new type of foam which they propose to use in life-preserver vests. It is much cheaper than traditional materials. When measured, it has a mass of 12.0 grams and a volume of 6.0 cm 3. Would this be a good choice of material for a life- jacket manufacturing company? Defend your answer.