Experiment 1 - Common Lab Operations

Question 1

where the fuel and air mixes

Answer 1

Barrel

Question 2

entrance of the air

Answer 2

Air hole

Question 3

place of ignition

Answer 3

Mouth

Question 4

entrance of the fuel gas

Answer 4

Gas inlet

Question 5

valve that controls the fuel gas coming into the gas spud

Answer 5

Gas regulator

Question 6

regulates/controls the amount of fuel gas to be combusted

Answer 6

Gas spud

Question 7

movable part that regulates/controls the amount of air coming in and to close and open the air holes

Answer 7

Collar

Question 8

supports the Bunsen burner

Answer 8

Base

Question 9

attached to the gas inlet and connected to the gas source

Answer 9

Rubber tubing

Question 10

What influence does the opening and closing of the air holes have on the amount of air mixing with the gas?

Answer 10

This allows more air to aid in a complete combustion. That means opening the collar, allows a complete combustion as it allows the gas to mix with the air – and allow a non-luminous flame

Question 11

What are the 2 types of flames produced by a Bunsen Burner?

Answer 11

• luminous and non-luminous flame

Question 12

What type of flame is best for experiments?

Answer 12

non-luminous flames

Question 13

___ is commonly called burning.

Answer 13

Combustion

Question 14

The substance that burns is usually referred to as ___

Answer 14

fuel

Question 15

___ is needed for the complete combustion of a fuel.

Answer 15

Sufficient air or oxygen

Question 16

Complete combustion of a fuel yields ___

Answer 16

carbon dioxide and water vapor

Question 17

Complete combustion typically gives off ___

Answer 17

heat and a non-luminous flame

Question 18

The general equation for a complete combustion reaction is

Answer 18

fuel + O2(g) → CO2(g) + H2O(g) + heat

Question 19

___ occurs when the supply of air or oxygen is poor

Answer 19

Incomplete combustion

Question 20

incomplete combustion yields ___ aside from carbon dioxide and water vapor

Answer 20

carbon monoxide and pure carbon

Question 21

pure carbon is called ___

Answer 21

soot

Question 22

The flame produced by incomplete combustion is a ___

Answer 22

luminous flame

Question 23

The general equation for an incomplete combustion is

Answer 23

fuel + O2(g) → CO2(g) + H2O(g) + CO(g) + C(s) + heat

Question 24

Why should you never blow out a gas flame from a bunsen burner?

Answer 24

If you blow out the flame without turning off the gas, gas continues to flow. Exposure to too much gas can kill you.

Question 25

Record the volumes of liquids in approximately ___

Answer 25

two decimal places

Question 26

For reading the volume of colored liquids, keep the eye level with ___

Answer 26

the upper meniscus.

Question 27

What influence does the opening and closing of the air holes have on the amount of air
mixing with the gas?

Answer 27

The gas and air will only be able to mix at the mouth of the Bunsen burner instead of at the Air holes.

Question 28

Why should the liquid be heated at a 45-degree angle?

Answer 28

We hold it an angle to avoid the rapid expansion and production of gas while heating.
This way, this reduces pressure while also allowing gases to escape harmlessly into the air.

Question 29

Why should it be moved slowly back and forth?

Answer 29

We move it to achieve uniform heating. Concentrating the heat at the bottom may cause the Test tube to shatter or violently eject contents through the opening.

Question 30

Why should one heat the upper portion of the liquid rather than the bottom?

Answer 30

We need to heat the upper portion in order to concentrate the boiling near the surface.
Doing so reduces the potential for bumping and boil-over from the test tube.

Question 31

Why is wafting important?

Answer 31

It helps ensure your safety from possible harmful vapors or fumes that could damage
The mucous membranes of the lungs.