When the following equation is balanced the coefficient in front of HCl is?
When the following equation is balanced, the coefficient in front of HCl is: Ba(s) + HCl(aq)→BaCl2(aq) + H2(g) Question 4 options: 6.
Which is the balanced equation for S8 O2 → SO2?
Search by reactants (S 8, O 2) and by products (SO 2)
| 1 | O2 + S8 → SO2 |
|---|---|
| 2 | O2 + Fe + S8 → SO2 + FeS |
Which is the balanced equation for V2O5?
The right answer is: V2O5 + 5CaS → 5CaO + V2S5.
How do you form SO2?
Sulfur dioxide, SO2, is a colorless gas or liquid with a strong, choking odor. It is produced from the burning of fossil fuels (coal and oil) and the smelting of mineral ores (aluminum, copper, zinc, lead, and iron) that contain sulfur. Sulfur dioxide dissolves easily in water to form sulfuric acid.
What is the formula of Sulphur dioxide?
SO₂
Is Sulphur stored in water?
Sulphur is a very reactive non- metal. …
Is sulfur dioxide toxic to humans?
Short-term exposures to high levels of sulfur dioxide can be life-threatening. Exposure to 100 parts of sulfur dioxide per million parts of air (ppm) is considered immediately dangerous to life and health. Long-term exposure to persistent levels of sulfur dioxide can also affect your health.
Which is more dangerous H2S or SO2?
Hydrogen sulfide (H2S) is a poisonous chemical asphyxiate, similar to cyanide gas or carbon monoxide. It is much more dangerous than sulfur dioxide (SO2).
At what ppm can you smell H2S?
Hydrogen sulfide has a low odor threshold, and its smell may be detected below 1 ppm. The minimal perceptible odor is reported as 0.13 ppm. The rotten egg odor is recognizable up to 30 ppm.
How fast can H2S kill you?
Death can occur within 1 to 4 hours of exposure. Above 500 Immediate loss of consciousness. Death is rapid, sometimes immediate. H2S levels of 100 ppm and higher are considered immediately dangerous to life and health (IDLH).
What happens if you breathe H2S?
The health effects of hydrogen sulfide depend on how much H2S a worker breathes and for how long. However, many effects are seen even at low concentrations. Effects range from mild, headaches or eye irritation, to very serious, unconsciousness and death.
What are the symptoms of H2S exposure?
At low levels, hydrogen sulfide causes irritation of the eyes, nose, and throat. Moderate levels can cause headache, dizziness, nausea, and vomiting, as well as coughing and difficulty in breathing. Higher levels can cause shock, convulsions, coma, and death.
How long does H2S stay in your system?
Hydrogen sulfide air concentrations from natural sources range between 0.00011 and 0.00033 ppm. In urban areas, the air concentrations are generally less than 0.001 ppm. Hydrogen sulfide remains in the atmosphere for approximately 1–42 days, depending on the season.
How many ppm H2S is deadly?
H2S is immediately fatal when concentrations are over 500-1000 parts per million (ppm) but exposure to lower concentrations, such as 10-500 ppm, can cause various respiratory symptoms that range from rhinitis to acute respiratory failure.
How many ppm is 1 H2S?
Percent to ppm conversion table
| Percent VOL | ppm |
|---|---|
| 0.01% | 100 ppm |
| 0.1% | 1000 ppm |
| 1% | 10000 ppm |
| 2% | 20000 ppm |
How many ppm of hydrogen is dangerous?
It has also been reported that 50 to 100 ppm causes mild conjunctivitis and respiratory irritation after 1 hour; 500 to 700 ppm may be dangerous in 0.5 to 1 hour; 700 to 1,000 ppm results in rapid unconsciousness, cessation of respiration, and death; and 1,000 to 2,000 ppm results in unconsciousness, cessation of …
What is LEL and UEL of H2S?
Flammability Range. U.E.L. H2S = 46% or 460,000 ppm. L.E.L. H2S = 4.3% or 43,000 ppm. Below 4.3% = Too Lean to Burn. Over 46% = Too Rich to Burn.
How is Lel calculated?
To compute the LEL of any gas in air, divide the unknown concentration by the LEL listed in the NFPA Handbook. 100% LEL’s for 9 of Gasco’s more common gasses are shown in the table to the left. For example, if you take 2.5% Methane in air and divide it by 100% LEL of methane (5%), the result is 50% LEL.
What is LEL & UEL?
The minimum concentration of a particular combustible gas or vapor necessary to support its combustion in air is defined as the Lower Explosive Limit (LEL) for that gas. The maximum concentration of a gas or vapor that will burn in air is defined as the Upper Explosive Limit (UEL).
What is a safe LEL level?
Atmospheres with a concentration of flammable vapors at or above 10 percent of the lower explosive limit (LEL) are considered hazardous when located in confined spaces. However, atmospheres with flammable vapors below 10 percent of the LEL are not necessarily safe. Such atmospheres are too lean to burn.
What is the minimum acceptable oxygen level in confined space?
19.5 %
What is the oxygen level in confined space?
Make sure that the oxygen content in the confined space is not enriched. Oxygen content should be less than 23% but maintained at levels greater than 19.5%.
What is Lel in confined space?
An LEL Confined Space refers to Lower Explosive Limit within the confined space, which will be a percentage of combustible material in a gas or vapor state, that if mixed in the right proportion with air can create a hazardous fuel/air mixture that can be ignited and explode.
What are the four main dangers of a confined space?
What are the main confined space hazards?
- Lack of Oxygen. Oxygen can be removed from the atmosphere within a confined space through naturally occurring reactions.
- Gases, Fumes and Vapours.
- Flooding.
- Dust.
- Fire and Explosions.
- Temperature.
- Access Restrictions.
What is the LEL of CO?
CO is a colorless, odorless, tasteless and combustible gas with a lower explosive limit (LEL) of 12.5% or 125,000 parts per million (propane has an LEL of 2.2% or 22,000 ppm). CO will replace oxygen in the bloodstream, resulting is various health problems.