Question

(1)

Question 1

Which of the following is incorrect?

1-	Air vents allow air into the burner
2-	The gas inlet controls the amount of methane gas burned in the bunsen burner
3-	The barrel controls the amount of air going into the burner
4-	The needle valve controls the amount of methane gas allowed into the bunsen burner

Question 2

Which of the following correctly describes how to obtain mass/weight of a sample by difference?

1-	Subtract the mass of the beaker from the mass of the beaker with the sample
2-	Subtract the mass of the beaker from the mass of the sample
3-	The mass of the beaker plus the sample is the correct mass
4-	Add the mass of the beaker plus the mass of the sample

Question 3

Which of the following appropriately describes how to read the volume of a liquid?

1-	At the bottom of the meniscus
2-	Where the liquid touches the side of the container
3-	1 cm below the observed number
4-	At the top of the meniscus

Question 4

Which of the following is NOT appropriate for disposing waste?

1-	Matches and boiling stones can be placed in regular trash cans
2-	Solid chemical waste should be placed in the appropriately labeled container in the hood
3-	Liquid waste can be poured down the drain
4-	Liquid waste should be placed in the appropriately labeled container in the hood

Question 5

The mass of a beaker was determined to be 39.5 g. To this beaker, some chemical was added; the mass of the beaker with the chemical was 41.8. What is the mass of the sample?

Answer 1

1) Which of the following is incorrect?

Ans: The barrel controls the amount of air going into the burner.

2) Which of the following correctly describes how to obtain mass/weight of a sample by difference?

Ans: Subtract the mass of the beaker from the mass of the beaker with the sample

3) Which of the following appropriately describes how to read the volume of a liquid?

Ans: At the bottom of the meniscus ( Explanation: bottom of the meniscus gave correct reading)

4) Which of the following is NOT appropriate for disposing waste?

Ans: Liquid waste can be poured down the drain ( Explanation: It cause enviroment polution)

5) Mass of the sample calculated by subtracting the mass of the beaker from the mass of the beaker with the sample

i.e. Mass of the sample = 41.8- 39.5 = 2.3g