# Chemistry 2 final, for question 9 check the attachment plz

**There are 10 questions. Each is worth one point.**

- Explain how common unit prefixes are used with SI base units.
- Give a value for a measurement with the correct SI units and the number of significant figures indicated.

a. mass with 4 significant figures

b. volume with 1 significant figure

c. length with 2 significant figures

d. temperature with 5 significant figures

- You can express the density of an object in units of kg/L or in units of g/mL. How is the density of an object in kg/L related to its density in g/mL?

**The following questions (4-8) refer to the PhET sim Buoyancy activity. See the Lab 2 document for more information.**

- How does increasing the size of an object change the object’s density? Explain your answer. Which of the tables you completed in the lab activities did you use to answer this question?
- Determine the density in both kg/L and g/L of an unknown metal that displaces 2.8 L of water and has a mass of 54.04 kg.
- How much water will a 115.8 kg block of your unknown metal from the PhET Sim displace?
**The following questions (4-8) refer to the PhET sim Buoyancy activity. See the Lab 2 document for more information.** - How does increasing the size of an object change the object’s density? Explain your answer. Which of the tables you completed in the lab activities did you use to answer this question?
- Determine the density in both kg/L and g/L of an unknown metal that displaces 2.8 L of water and has a mass of 54.04 kg.
- How much water will a 115.8 kg block of your unknown metal from the PhET Sim displace?

7. Use the Tables you used for the mystery table to determine the identity of the unknown metal.

8. The red block in the “**Same Volume**” floats in water. The blue block in the “**Same Volume**” sinks. Using the Sim can you find a way to make the blue block float? Explain what you did.

9. What is the volume of liquid in the following graduated cylinders?

10. A room is 20.0 feet wide and 30.0 feet long with ceilings that are 10.0 feet high. You need to find the volume of the room in cubic meters (m3). What conversion factor(s) would you use to solve this problem?