Question

1. ______ 9. ____ 10. ____ 11. what is the volume of the rock? ______ 12. why do some graduated cylinders have a plastic ring around it?

Explanation:

Step1: Read liquid - level for 8

The meniscus of the liquid in the first graduated cylinder is at 45 mL. So, for question 8, the reading is 45 mL.

Step2: Read liquid - level for 9

The meniscus of the liquid in the second graduated cylinder is at 3.5 mL. So, for question 9, the reading is 3.5 mL.

Step3: Read liquid - level for 10

The meniscus of the liquid in the third graduated cylinder is at 28 mL. So, for question 10, the reading is 28 mL.

Step4: Calculate volume of rock

The volume of water before adding the rock is 110 mL and after adding the rock is 130 mL. The volume of the rock is the difference between the two volumes.
$V = 130 - 110=20$ mL. So, for question 11, the volume of the rock is 20 mL.

Step5: Answer question 12

The plastic ring around a graduated cylinder is to protect it from breaking if it is dropped. It acts as a shock - absorber.

Answer:

1. 45 mL
2. 3.5 mL
3. 28 mL
4. 20 mL
5. To protect the graduated cylinder from breaking if dropped.