Mine Gasses, Questions 1

1. What is the symbol for the gas Hydrogen Sulphide?

CO

CH4

H2S

CO2

Hydrogen Sulphide is a compound composed of two elements, hydrogen (H) and sulphur (S). The symbol for hydrogen is H, and the symbol for sulphur is S. Therefore, the correct symbol for Hydrogen Sulphide is H2S.

Explanation

Hydrogen Sulphide is a compound composed of two elements, hydrogen (H) and sulphur (S). The symbol for hydrogen is H, and the symbol for sulphur is S. Therefore, the correct symbol for Hydrogen Sulphide is H2S.

2. What is the chemical symbol for Carbon Dioxide?

CO

CO2

C2H2

H20

The chemical symbol for Carbon Dioxide is CO2. Carbon Dioxide is composed of one carbon atom (C) and two oxygen atoms (O), hence the chemical formula CO2.

Explanation

The chemical symbol for Carbon Dioxide is CO2. Carbon Dioxide is composed of one carbon atom (C) and two oxygen atoms (O), hence the chemical formula CO2.

3. What gas is given the symbol "CO"?

Methane

Carbon Dioxide

Carbon monoxide

Dinitrotetraoxide

Carbon monoxide is given the symbol "CO" because it consists of one carbon atom (C) and one oxygen atom (O). The symbol "CO" is derived from the chemical formula of carbon monoxide, which represents the ratio of atoms in the compound. Carbon monoxide is a colorless, odorless gas that is produced by the incomplete combustion of carbon-containing substances. It is highly toxic and can be lethal in high concentrations.

Explanation

Carbon monoxide is given the symbol "CO" because it consists of one carbon atom (C) and one oxygen atom (O). The symbol "CO" is derived from the chemical formula of carbon monoxide, which represents the ratio of atoms in the compound. Carbon monoxide is a colorless, odorless gas that is produced by the incomplete combustion of carbon-containing substances. It is highly toxic and can be lethal in high concentrations.

4. Approximately, what is the percentage of Nitrogen in Normal/Fresh air?

20.9%

79.04%

19.5%

21.9%

The correct answer is 79.04%. This is the percentage of Nitrogen in Normal/Fresh air.

Explanation

The correct answer is 79.04%. This is the percentage of Nitrogen in Normal/Fresh air.

5. Oxygen,

Is Highly Flammable gas.

Is an Inert gas.

Is an explosive Gas

Is a gas that Supports Combustion

Oxygen is a gas that supports combustion. This means that it is necessary for a fire to burn. Oxygen acts as an oxidizer, providing the necessary oxygen molecules for the combustion process to occur. Without oxygen, a fire cannot sustain itself and will eventually go out.

Explanation

Oxygen is a gas that supports combustion. This means that it is necessary for a fire to burn. Oxygen acts as an oxidizer, providing the necessary oxygen molecules for the combustion process to occur. Without oxygen, a fire cannot sustain itself and will eventually go out.

6. What is the explosive range of Hydrogen Sulphide?

2.5% - 93%

5% - 15%

4.3% - 46%

12.5% - 74%

The explosive range of Hydrogen Sulphide is 4.3% - 46%. This means that if the concentration of Hydrogen Sulphide in the air falls within this range, it can form an explosive mixture. Concentrations below 4.3% are too lean to ignite, while concentrations above 46% are too rich to ignite. It is important to be aware of this range to ensure safety when working with or around Hydrogen Sulphide.

Explanation

The explosive range of Hydrogen Sulphide is 4.3% - 46%. This means that if the concentration of Hydrogen Sulphide in the air falls within this range, it can form an explosive mixture. Concentrations below 4.3% are too lean to ignite, while concentrations above 46% are too rich to ignite. It is important to be aware of this range to ensure safety when working with or around Hydrogen Sulphide.

7. Oxides of Nitrogen (NOx) can be produced in the mine by:

Crushing of salt or stone.

Breathing, normal respiration.

Blasting operations.

Decomposing Organic matter.

Blasting operations in mines can produce Oxides of Nitrogen (NOx) due to the high temperatures and pressures generated during the explosions. These conditions cause nitrogen and oxygen in the air to react and form NOx. Crushing of salt or stone, breathing, and decomposing organic matter do not involve the same extreme conditions required for the production of NOx.

Explanation

Blasting operations in mines can produce Oxides of Nitrogen (NOx) due to the high temperatures and pressures generated during the explosions. These conditions cause nitrogen and oxygen in the air to react and form NOx. Crushing of salt or stone, breathing, and decomposing organic matter do not involve the same extreme conditions required for the production of NOx.

8. Normal/Fresh air is made up of:

79.04% Nitrogen, 20.93% Oxygen, 0.03% Carbon Monoxide and other gasses.

79.04% Oxygen, 20.93% Nitrogen, 0.03% Carbon Monoxide and other gasses.

79.04% Nitrogen, 20.93% Oxygen, 0.03% Methane and other gasses.

79.04% Nitrogen, 20.93% Oxygen, 0.03% Carbon Dioxide and other gasses.

Normal/Fresh air is composed of various gases, with the majority being nitrogen (79.04%) and oxygen (20.93%). Carbon dioxide, although present in a small amount (0.03%), is also a component of normal air. Additionally, there are other gases present in normal air, but they are not specified in the answer.

Explanation

Normal/Fresh air is composed of various gases, with the majority being nitrogen (79.04%) and oxygen (20.93%). Carbon dioxide, although present in a small amount (0.03%), is also a component of normal air. Additionally, there are other gases present in normal air, but they are not specified in the answer.

9. Converting a percentage to "parts per million" units, what would be the ppm for 0.04%?

4ppm

40ppm

400ppm

4000ppm

To convert a percentage to "parts per million" (ppm), you multiply the percentage by 10,000. In this case, 0.04% multiplied by 10,000 equals 400ppm.

Explanation

To convert a percentage to "parts per million" (ppm), you multiply the percentage by 10,000. In this case, 0.04% multiplied by 10,000 equals 400ppm.

10. What is the occupational exposure limit for Carbon Monoxide:

50ppm over an 8 hour shift

30ppm over a 12 hour shift.

5ppm over a 12 hour shift.

30ppm over an 8 hour shift.

The correct answer is 30ppm over an 8 hour shift. Occupational exposure limits are set to ensure worker safety and prevent adverse health effects from exposure to hazardous substances. In the case of Carbon Monoxide, the recommended limit is 30ppm (parts per million) over an 8 hour shift. This means that workers should not be exposed to concentrations of Carbon Monoxide higher than 30ppm on average during their 8-hour work shift to minimize health risks.

Explanation

The correct answer is 30ppm over an 8 hour shift. Occupational exposure limits are set to ensure worker safety and prevent adverse health effects from exposure to hazardous substances. In the case of Carbon Monoxide, the recommended limit is 30ppm (parts per million) over an 8 hour shift. This means that workers should not be exposed to concentrations of Carbon Monoxide higher than 30ppm on average during their 8-hour work shift to minimize health risks.