Home

Is gasoline a chemical compound

Gasoline is composed of petroleum liquids and crude oil. Since the composition of the constituent substances is not well defined or constant. So, it is not a pure substance. That means gasoline.. Gasoline is a complex mixture of over 500 hydrocarbons that may have between 5 to 12 carbons. Alkanes type compounds, either straight chain or branched coupounds are present is greatest amounts. Smaller amounts of alkane cyclic and aromati Most chemicals found in gasoline is colorless and very flammable chemical compound with a strong smell, including this chemical. It an industrial substance and a common ingredient for antiseptics, disinfectants, and detergents. As a major ingredient for gasoline to remove brake fluid from braking systems Gasoline is a complex mixture of over 500 hydrocarbons that may have between 5 to 12 carbons. Smaller amounts of alkane cyclic and aromatic compounds are present. Virtually no alkenes or alkynes are present in gasoline. Compounds Gasoline is a mixture of paraffins (alkanes), cycloalkanes (naphthenes), and olefins (alkenes). Typically gasoline consists of hydrocarbons, which is a chain of hydrogen atoms and between 4 and 12 carbon atoms per molecule, represented as C4-C12

The petroleum that is pumped out of the ground is a complex mixture of several thousand organic compounds, including straight-chain alkanes, cycloalkanes, alkenes, and aromatic hydrocarbons with four to several hundred carbon atoms Although gasoline contains many different chemical compounds, it is made up mostly of hydrocarbons, and all hydrocarbons form the same products when they are burned (just in different amounts). When a hydrocarbon is burned (that is, reacted with oxygen), it forms carbon dioxide (CO 2) and water (H 2 O) Gasoline, regardless of the octane rating, does not have a unique chemical formula. Gasoline is not a compound, it is a mixture of over a hundred different compounds. The composition will vary with the manufacturer, the the time of year, and the octane rating of the gasoline

Is gasoline an element, a compound, or a mixture? Explain

  1. ing the composition of it
  2. g differences and the use of the term gas) is a transparent, petroleum-derived flammable liquid that is used primarily as a fuel in most spark-ignited internal combustion engines.It consists mostly of organic compounds obtained by the fractional distillation of petroleum, enhanced with a variety.
  3. In this article we have shared the answer for A chemical compound consisting of carbon and hydrogen atoms; used for gasoline. Word Craze is the best version of puzzle word games at the moment. This game presents the best combination of word search, crosswords, and IQ games
  4. Benzene (C6H6) is a chemical compound in gasoline. When gasoline burns, the benzene reacts with oxygen. 2 C6H6 + 15 O2 → 12 CO2 + 6 H2O + 1562 kcal If you want to obtain 39.3 kcal of heat by reacting benzene with oxygen, how many grams of benzene must you use
  5. Composition. The exact chemical composition of gasoline varies depending on its grade or octane rating, but generally speaking it is a mixture of combustible hydrocarbons.This octane rating describes the quality of the fuel, and the value is based off the ratios of two compounds in the gasoline - specifically iso-octane, a compound with the same chemical formula as octane but with a slightly.
  6. Gasoline is made mostly of aromatic compounds ranging from benzene to dimethyl- and ethylnaphathalenes. Diesel fuel is composed mostly of aliphatic compounds ranging from octane to docosane. Thus, gasoline has an autoignition temperature much higher than diesel fuel
  7. compounds although as many as 1,000 compounds have been identified in some blends (Domask 1984; Mehlman 1990). Information regarding the chemical identity of gasoline is located in Table 3-l. 3.2 PHYSICAL AND CHEMICAL PROPERTIES Information regarding the physical and chemical properties for the gasoline mixture is located in Table 3-2

Gasoline is a homogeneous mixture made from processing or refining crude oils. A homogeneous mixture consists of combinations of different substances. However, a homogeneous mixture also has uniform composition and properties throughout First, gasoline is not a simple chemical compound like water or ethanol. It is a mixture of hundreds of different compounds. The reason for this is that gasoline is made from crude oil. Crude oil.

Octane does not cause axonopathy. A concn of 35 mg/l resulted in the loss of righting reflexes in mice and 50 mg/l caused a total loss of reflexes. A concn of 9.5% causes loss of reflexes in mice in 125 min; however, < or =1.9% is easily tolerated for 143 min, and the effects are reversible The compound 2-chlorobenzalmalononitrile (also called o-chlorobenzylidene malononitrile; chemical formula: C 10 H 5 ClN 2), a cyanocarbon, is the defining component of tear gas commonly referred to as CS gas, which is used as a riot control agent.Exposure causes a burning sensation and tearing of the eyes to the extent that the subject cannot keep their eyes open, and a burning irritation of. Gasoline is a complex mixture of molecules with a boiling range of 40-200°C (104-392°F). To produce various grades, there is a blending of many refinery components, each of which promotes specific fuel qualities such as desired octane rating, volatility, and minimization of engine deposits Benzene (C6H6) is a chemical compound in gasoline. When gasoline burns, the benzene reacts with oxygen. 2 C6H6 + 15 O2 → 12 CO2 + 6 H2O + 1562 kcal. If you want to obtain 49.7 kcal of heat by reacting benzene with oxygen, how many grams of benzene must you use

Pure oxygen gas is definitely not a chemical compound. Instead, it is a chemical element. It is a substance that consists of only a single type of atom. O is its official chemical symbol, whereas 8 is its atomic number. This means that an oxygen atom features 8 protons in its nucleus A chemical is any substance consisting of matter.This includes any liquid, solid, or gas. A chemical is any pure substance (an element) or any mixture (a solution, compound, or gas). They can either occur naturally or can be created artificially mass. a measure of the amount of matter that an object contains; the SI base unit of mass is the kilogram. mixture. a physical blend of two or more substances that are not chemically combined. substance. matter that has uniform and definite composition; either an element or a compound. heterogeneous mixture A brief history of tear gas. The use of tear gas dates back to World War I when soldiers used it during wartime to incapacitate enemy troops. In 1925, the Geneva Convention categorized tear gas as a chemical warfare agent and banned its use during wartime. However, its use by police in the U.S. is still technically legal

Gasoline Compounds - Elmhurst Universit

Tetraethyl lead, organometallic compound containing the toxic metal lead that for much of the 20th century was the chief antiknock agent for automotive gasoline. Beginning in the 1970s, 'leaded gasoline' was phased out on account of its contribution to lead poisoning In alkylation. as alkylate, consists mainly of isooctane, a compound that lends excellent antiknock characteristics to gasolines. Read More. In petroleum refining: Polymerization and alkylation. process for the manufacture of isooctane, a primary component in the blending of aviation gasoline. Read More Gasoline, a refined product of crude oil, does not have a single chemical formula as it is a mixture of over 500 hydrocarbons and other compounds. These hydrocarbons typically have five to 12 carbon atoms per chain. Gasoline contains between 30 and 50 percent heptane and isooctane, which feature seven and eight carbon atoms, respectively

List of Chemicals Found in Gasoline - Substances - Uses

Petroleum or crude oil is a naturally occurring, flammable, complex and variable mixture of hydrocarbons plus other organic compounds in the liquid state. Petroleum contains 83- 87% carbon, 10 to 14% hydrogen, with trace amounts of nitrogen, oxygen and sulfur CNG - Compressed natural gas Cyclo-compound - Molecules which for a closed loop rather than a chain. Saturated cyclo-compounds are called naphthenes. ETBE - Ethyl Tertiary Butyl Ether - An oxygenated compounds added to gasoline to reduce vehicle exhaust emissions Uncorrect question ! A gas is a chemical compound. A chemical reaction is a process of chemical interaction between several substances (compounds) We have another way to check if a compound is gas or solid or liquid, i.e. entropy (randomness), which is given by heat gained or lost divided by temperature. In general, compound which has greater randomness will be gas. We can expect most of the compounds to be gases, which have standard molar entropy greater than $200\ \mathrm{J K^{-1} mol.

Symptoms of Gas and Chemical Exposure. Soluble gases such as chlorine, ammonia, and hydrofluoric acid cause severe burning in the eyes, nose, throat, windpipe, and large airways within minutes of exposure to them. In addition, they often cause cough and blood in the sputum (hemoptysis). Retching and shortness of breath also are common CS gas is the most common of these TRPA1-activating agents but, recently, law enforcement has begun using a newer compound, says Rohini Haar, a doctor with Physicians for Human Rights and a public. ethylbenzene from gasoline, use of ethylbenzene as a solvent in pesticides, carpet glues, Xylene is mostly a human-made chemical. Chemical industries produce xylene from petroleum. Carbon tetrachloride is a manufactured compound that does not occur naturally. It has bee The elements of a compound can be separated into simpler substances by chemical reactions. Compounds play an integral part in our daily lives; right from the water, we drink to the gasoline that drives our automobile to the medicines that help us fight diseases

Gasoline - Elmhurst Universit

  1. So, to sum up, gasoline is a complicated mixture of hydrocarbons boiling between 120 and 400 degrees F, with chemical formulas between C6H14 and C12H26, but a good average compound is C8H18. These react in an ideal situation to produce carbon dioxide and water, but in an actual automobile engine they also produce some amount of undesirable.
  2. Some other exposures have also gone down over time, such as the amount of benzene allowed in gasoline. Workplace exposures. Workers in industries that make or use benzene may be exposed to this chemical. These include the rubber industry, oil refineries, chemical plants, shoe manufacturers, and gasoline-related industries
  3. This compound was assigned the number 100, meaning it was the best hydrocarbon to use. The worst hydrocarbon researchers could find in gasoline (which when burned pure gave the most knocking) was n -heptane, assigned the number 0. When isooctane and heptane were mixed, they gave different amounts of knocking depending on their ratio: The higher.
  4. ing the composition. The ratio of each element is.
  5. Sulfur and cyanide compounds were removed by passing the gas through purifier beds made up of either lime or wood chips impregnated with iron filings. Chemical reactions would take place between the gas and the purifier material, removing impurities which otherwise would corrode the gas piping, stoves, and lighting fixtures where the gas was.
  6. A. ice melts at 0 degrees C. B. water gas a high specific heat. C. sodium is a soft shiny metal. D. helium is very nonreactive. E. glycerol is a viscous liquid. helium is very nonreactive. The state of matter for an object that has a definite volume but not a definite shape is. A. elemental. B. solid
  7. Oxygen is an element displayed by the symbol O, and atomic number 8. It is an essential element for human survival. Decreased oxygen levels may be treated with medical oxygen therapy. Treatment with oxygen serves to increase blood oxygen levels and also exerts a secondary effect of decreasing blood flow resistance in the diseased lung, leading to decreased cardiovascular workload in an attempt.

4.1 CHEMICAL IDENTITY Information regarding the chemical identity of the most common cyanides is located in Table 4-1. Hydrogen cyanide is a toxic gas that may enter the environment from both natural processes and human industrial activities. It may exist in polymeric forms. The cyanide compounds in which cyanide can b What about the Gas Used to Fill the Airbag? Chemical Reactions Used to Generate the Gas. Inside the airbag is a gas generator containing a mixture of NaN 3, KNO 3, and SiO 2.When the car undergoes a head-on collision, a series of three chemical reactions inside the gas generator produce gas (N 2) to fill the airbag and convert NaN 3, which is highly toxic (The maximum concentration of NaN 3. Riot control agents (sometimes referred to as tear gas) are chemical compounds that temporarily make people unable to function by causing irritation to the eyes, mouth, throat, lungs, and skin. Several different compounds are considered to be riot control agents

What is the compound of gasoline? - Quor

Chemical Formula: A representation of the chemical composition of a substance. This can be either a molecular or empirical formula. Basically a chemical formula gives scientists a variety of information about a particular compound. Let's look at iso-octane. Iso-octane is the component of gasoline that burns the smoothest A chemical compound is a chemical combination of two or more elements that can normally be broken down into simpler substances by chemical means and have properties different from those of its. The combustion of chlorinated organic compounds may produce poisonous phosgene gas (COCl2). Other materials formed by incomplete combustion are classes of chlorinated organic compounds, chlorodibenzodioxins and chlorodibenzofurans. These compounds cause cancer in laboratory tests

Molecules, Compounds and Chemical Equations CHM 108 Suroviec Fall 2015 Figure 03-00-02 Title: Mixtures and compounds Caption: The balloon in this illustration is filled with a mixture of hydrogen gas and oxygen gas. The proportions of hydrogen and oxygen are variable. The glass is filled with water, a compound of hydrogen and oxygen A pure chemical compound is a chemical substance that is composed of a particular set of molecules or ions that are chemically bonded. Two or more elements combined into one substance through a chemical reaction, such as water, form a chemical compound. All compounds are substances, but not all substances are compounds Tear gas is, confusingly, not usually a gas - or at least, the active ingredient isn't. What we refer to as tear gas is usually a compound called 2-chlorobenzalmalononitrile, or CS for short. At room temperature, it's a white solid, and it's usually dispersed as microscopic particles or dissolved in solution as a spray Carbon dioxide is a chemical compound that consists of two oxygen atoms and one carbon atom. It is necessary for everyday life because it is utilized by plants and exhaled by animals. Carbon dioxide, CO 2, is a gas during room temperature, and is a gas in the earth¡¯s atmosphere. It is a made up of about 385 ppm in the Earth's atmosphere Ethylene is an organic compound that contains a double bond, thus being an unsaturated hydrocarbon. It is produced on a very large scale, because of its responsibility in the body as a hormone. Ethylene is the chemical compound. The formula for this is C 2 H 4.It has four hydrogen atoms bound. It is referred as gas olefiant or oil making gas

3.8: Gasoline - A Deeper Look - Chemistry LibreText

Benzene - used in gasoline, causes several cancers, including leukemia Benzo[a]pyrene - this chemical is found in coal tar pitch, and creosote. It is a known carcinogen, especially for lung. The next day, tear gas was used to break up a fight at Long Bay jail, as prison guards filled an exercise yard with tear gas canisters - also impacting nearby residents. These events followed the deployment of chemical riot control agents - specifically pepper bombs - in Washington DC last week

Re: Chemical formula for common gasolin

Chemical Segregation and Storage Table Chemical Segregation Class of Chemicals Common Chemical form explosive compounds within fume hood ducts shelving *Hydrofluoric acid should be stored Handle toxic compressed gases in Flammable Compressed Gases Release of Toxic Gas a chemical fume hood Oxidizing Compressed Gases Hydrogen Sulfide is a. The next day, tear gas was used to break up a fight at Long Bay jail, as prison guards filled an exercise yard with tear gas canisters - also impacting nearby residents.. These events followed the deployment of chemical riot control agents - specifically pepper bombs - in Washington DC last week. They were used to clear protesters from a public park so President Donald Trump could. Tear gas, or lachrymatory agent, refers to any of a number of chemical compounds that cause tears and pain in the eyes and sometimes temporary blindness. Tear gas can be used for self-defense, but it is more commonly used as a riot control agent and as a chemical weapon Chemistry End of Chapter Exercises. Classify the six underlined properties in the following paragraph as chemical or physical: Fluorine is a pale yellow gas that reacts with most substances.The free element melts at −220 °C and boils at −188 °C.Finely divided metals burn in fluorine with a bright flame.Nineteen grams of fluorine will react with 1.0 gram of hydrogen

What is the chemical formula for gasoline? - Quor

Chemical Compounds List and their Common Names and

Whether it's tear gas, pepper spray, mace or pepper balls, all have one thing in common: they're chemical weapons. Chemical warfare agents have been used twice in Sydney in the past week alone Gas bubbles appear after a chemical reaction has occurred and the mixture becomes saturated with gas. The chemical change that creates the gas is completed after the gas bubbles leave the mixture. Examples of this type of reaction are when an antacid is dropped in a glass of water and begins to bubble or when boiling water bubbles , is a toxic gas used as a chemical weapon. Yet when these two elements combine, they form the compound sodium chloride, NaCl, a white crystalline solid that we sprinkle all over our food. Compounds are described using the chemical symbols for elements. A subscript is used to show the number of atoms of each element in a unit of the compound

Gasoline - Wikipedi

A chemical compound consisting of carbon and hydrogen

If you compound a problem you add something to it to make it worse, like say, putting water on a grease fire. Compound means to combine; a compound is a combination or mixture of two or more things action of heat on some other chemical compoundAmmonium nitrateNH4NO3(g) N2O(g) + H2O(g)it decomposes to give nitrous oxide and water vapour N2Ois called laughing gas,also used as anesthesia.Ammonium ChlorideNH4Cl(s) NH3(g)+ HCl(g)White crystalline solid on strong heating sublimes to formdense white fumes, the dense white fume. A chemical reaction is the change of a substance into a new one that has a different chemical identity. the formation of a precipitate, the evolution of gas, or a color change. two or more substances combine to form a new compound. This type of Blister Agents/Vesicants. Chemicals that severely blister the eyes, respiratory tract, and skin on contact. Mustards. Mustard gas (H) (sulfur mustard) Mustard/lewisite (HL) Nitrogen mustard (HN-1, HN-2, HN-3) Sesqui mustard. Sulfur mustard (H) (mustard gas) Lewisites/chloroarsine agents of each kind in a chemical compound. For a molecular compound, the chemical formula reveals the number of atoms of each element con-tained in a single molecule of the compound, as shown below for the hydrocarbon octane. (Hydrocarbons are molecular compounds com-posed solely of carbon and hydrogen.) CHEMICAL FORMULAS AND CHEMICAL COMPOUNDS 203.

Chemical Compounds list & formula- Let's find out first what a Chemical Compound- is a chemical combination of two or more similar molecules collected together the atoms bonded with chemical bonding.To get a proper chemical compound, always specific rations of chemicals are involved in the composition to get the final mixture This occurs when chemical reactions in the atmosphere produce or destroy greenhouse gases, including tropospheric ozone. Indirect effects also occur when a gas influences atmospheric lifetimes of other gases or affects atmospheric processes like cloud formation that alter Earth's radiative energy balance by increasing Earth's albedo

Mixture: Examples of Chemical Substances. A chemical compound is different than a mixture. A mixture might include a number of different elements, but in a mixture, none of the elements share chemical bonds with each other. Steel, for example, is a mixture. Steel is composed of quantities of iron (Fe) and carbon (C), but those elements are not. Chlorine gas is a form of elemental chlorine that is commonly used industrially. It is also a highly toxic gas. This compound was the first poison gas to be used during World War I. Chlorine gas has the characteristic smell of bleach. At atmospheric pressure and room temperature, elemental chlorine is a gas The Centers for Disease Control and Prevention defines tear gas, or riot control agents, as chemical compounds that temporarily make people unable to function by causing irritation to the eyes.

It is possible through chemical means. One of them would be electrolysis, which breaks down the compound H 2O into hydrogen and oxygen. You might have seen this in school, if not check it out on youtube. Anyways, hope this helped. Ayako_Sho · 4 · Feb 23 2016 The most common lacrimator used for riot control is a compound called 2-chlorobenzalmalononitrile, or CS. (It's not actually a gas so much as a powder that's usually mixed with smoke to create. Sulfur Trioxide is a chemical compound which contain sulfur in a form of gas. With complex structure, this chemical compound is a main point in acid rain. Sulfur trioxide is useful in every sulfonation reactions. Zinc Sulfide (ZnS) Zinc sulfide is an inorganic white chemical compound which can be found in nature Describe evidence that burning gasoline in an engine is a chemical reaction. Energy is produced, which is what is used to power the car. Energy transfer is an indicator of a chemical change. A gas is produced, namely CO2, H2O, and many other byproducts. A gas given off is an indicator of a chemical change

Solved: Benzene (C6H6) Is A Chemical Compound In Gasoline

Gasoline - Energy Educatio

(b) The change from liquid to gas is called . vaporizing. (c) The change from solid to gas is called . sublimation. Solution. State the term that applies to each of the following changes of physical state: (a) Snow changes from a solid to a liquid. (b) Gasoline changes from a liquid to a gas. (c) Dry ice changes from a solid to a gas. Answers Top set: physical change: solid symbol molecules under phase change (from gas to liquid or solid) Bottom set: chemical change: open and solid symbol molecules dissociate and pair up with other elements to form new chemical compound/molecule The chemical substance in natural gas is a compound called methane. Its molecules are composed of carbon and hydrogen and each molecule contains four atoms of hydrogen and one atom of carbon. In this compound, 0.33597g of hydrogen is combined with 1g of C12. Use this information to calculate the atomic mass of the element hydrogen Methane gas (CH4) also called marsh gas is the simplest hydrocarbon compound of the alkanes or paraffin group with a regular tetrahedral chemical structure. Natural gas is the main source of methane molecules. CH 4 molecule is an important chemical product of the organic decay of swamps and marshes. The organic compound, methane gas is produced.

Mustard gas or sulfur mustard is a chemical compound which has been used as a chemical weapon.It was used in World War I by the German Army against British and Canadian soldiers near Ypres, Belgium, in 1917.Later it was also used against the French Second Army.. Most sulfur mustards are squishy liquids with no color and no smell when they are at room temperature Nitrogen oxide (NOx) is a chemical compound of oxygen and nitrogen that is formed by reacting with each other during combustion at high temperatures, mainly combustion of fuel such as oil, diesel, gas and organic matter. NOx is a common designation of nitrogen oxides NO and NO2. NOx can cause serious health damage to humans, including. A compound is a chemical whose molecules contain different elements (different kinds of atoms). Compounds are made when elements join together in a chemical reaction. Some compounds are very simple—water, for example, is a compound of just two elements, hydrogen and oxygen Chemical and Physical Characteristics of Ethanol and Hydrocarbon Fuels Terminal Objective Upon the successful completion of this module, participants will be able to describe the chemical and physical differences between pure gasoline and gasoline/ethanol blends. Enabling Objectives 1. Compare the chemistry of gasoline and ethanol. 2 methane. ChEBI ID. CHEBI:16183. Definition. A one-carbon compound in which the carbon is attached by single bonds to four hydrogen atoms. It is a colourless, odourless, non-toxic but flammable gas (b.p. −161°C). Stars. This entity has been manually annotated by the ChEBI Team. Secondary ChEBI IDs

Chemical compounds Sulfur compounds are chemical compounds containing sulfur ions . Sulfur comes in several forms: oxidation states of -2 ( hydrogen sulfide ), +4 ( sulfur dioxide , sulfites ) and +6 ( sulfuric acid , sulfates ) are most common, although there are other oxidation states However, behind the scenes, billions of chemical bonds are being created and destroyed. In this example, you may see bubbles of oxygen (O 2) gas. Those bubbles are evidence of the chemical changes. Melting a sugar cube is a physical change because the substance is still sugar. Burning a sugar cube is a chemical change

com·pound 1 (kŏm-pound′, kəm-, kŏm′pound′) v. com·pound·ed, com·pound·ing, com·pounds v.tr. 1. To combine so as to form a whole; mix: Tin was often compounded with lead to make pewter. 2. To produce or create by combining two or more ingredients or parts; compose or make up: pharmacists compounding prescriptions. 3. To settle (a debt, for. Gas chromatography definition is - chromatography in which the sample mixture is vaporized and injected into a stream of carrier gas (such as nitrogen or helium) moving through a column containing a stationary phase composed of a liquid or particulate solid and is separated into its component compounds according to their affinity for the stationary phase Uranium hexafluoride (UF 6) is the chemical form of uranium that is used during the uranium enrichment process. Within a reasonable range of temperature and pressure, it can be a solid, liquid, or gas. Solid UF 6 is a white, dense, crystalline material that resembles rock salt. Uranium hexafluoride does not react with oxygen, nitrogen, carbon.

ALEKS - Solving for a Reactant Using a Chemical EquationHydrocarbons and Crude Oil – GCSE Chemistry (CombinedLiquid Nitrogen GIFs - Find & Share on GIPHYOzone Molecular Structure Isolated On White Stock PhotoDifference Between Cyclohexane and Benzene | Definition

Volatile organic compounds (VOCs) are emitted as gases from certain solids or liquids. VOCs include a variety of chemicals, some of which may have short- and long-term adverse health effects. Concentrations of many VOCs are consistently higher indoors (up to ten times higher) than outdoors. VOCs are emitted by a wide array of products numbering. The U.S. Park Police denied using tear gas, yet acknowledged deploying a pepper compound, which the CDC and other scientific organizations list as one form of tear gas A chemical equation is a short hand expression of a chemical reaction. There are two parts to a chemical equation. The reactants are the elements or compounds on the left side of the arrow (-->). The elements and compounds to the right of the arrow are the products. Identify the reactants and the products in the equation below. Reactants: 2 H 2. The conversion process involves a complex chain of chemical reactions, leading to the formation of insoluble compounds of high molecular weight. The process is usually initiated by oxidation of certain fuel components (such as phenalenones), followed by reactions with acids [1152] Tear gas is the generic term for a class of compounds that cause a burning sensation. Its website's section on tear gas removal says the chemical leaves behind residue that can. Poorly controlled release of compressed gas in chemical reaction systems can cause vessels to burst, create leaks in equipment or hoses, or produce runaway reactions. sulphur or sulphur compounds, silicon and ammonia or ammonia compounds. Fires or explosions can result. The normal oxygen content in air is 21 percent. At slightly higher.