Lena Savoie
Alcohol, in chemistry, typically refers to ethanol (or ethyl alcohol), which is a volatile, flammable, colourless liquid with a pungent taste. It is the active ingredient in alcoholic drinks and is the second most consumed drug globally, after caffeine. Ethanol is an organic compound with the chemical formula CH3CH2OH, or C2H6O, where Et is the pseudoelement symbol for ethyl. The term ethanol was coined in 1892, blending ethane with the -ol ending of alcohol. The -ol ending is used in the International Union of Pure and Applied Chemistry (IUPAC) chemical name of all substances where the hydroxyl group is the functional group with the highest priority. Alcohols are among the most common organic compounds and are widely found in nature, with many applications in industry.
| Characteristics | Values |
|---|---|
| Chemical name | Ethanol |
| Molecular formula | C2H6O |
| Molecular weight | 46.0684 g/mol |
| IUPAC name | Ends with -ol |
| Molecular structure | CH3−CH2−OH or C2H5−OH |
| State | Volatile, flammable, colorless liquid |
| Odor | Slight |
| Uses | Psychoactive and recreational substance, antiseptic, disinfectant, solvent, fuel, sweetener, perfumes, toiletries, pharmaceuticals, sterilisation |
| Effects | Euphoria, decreased anxiety, increased sociability, sedation, impairment of cognitive, memory, motor, and sensory function, central nervous system depressant |
| Adverse effects | Addiction, acute alcohol poisoning, hangover, liver disease, hepatitis, cardiovascular disease, polyneuropathy |
| Production | Fermentation of grains, fruits or vegetables with yeast |
| Consumption | Legal in most countries, socially acceptable, sales and use restrictions in some countries |
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What You'll Learn
- Ethanol (ethyl alcohol) is the primary alcohol in alcoholic drinks
- It is a psychoactive depressant and the second most consumed drug globally
- Ethanol has many industrial uses, including as a solvent, antiseptic, disinfectant, and fuel
- Methanol is a common alcohol used as a solvent, raw material, and in antifreeze
- Alcohols are organic compounds with a hydroxyl (OH) functional group on an aliphatic carbon atom
Ethanol (ethyl alcohol) is the primary alcohol in alcoholic drinks
The term "alcohol" in the context of chemistry typically refers to ethanol (ethyl alcohol), the primary alcohol in alcoholic drinks. Ethanol is a simple alcohol with the molecular formula C2H6O and a molecular weight of 46.0684 g/mol. It is a volatile, flammable, colourless liquid with a slight characteristic odour. Ethanol is present in alcoholic drinks such as beer, wine, and distilled spirits (hard liquor). It is produced through the fermentation of carbohydrates with yeast or manufactured from ethylene obtained from cracked petroleum hydrocarbons.
Ethanol has a long history of use, with evidence of beer brewing by the Natufian culture in the Middle East dating back at least 13,000 years. The distillation of wine, a process that concentrates alcohol, was described in Arabic works from the 9th century CE and became widely known among Western European chemists by the 13th century. Today, ethanol is the second most consumed psychoactive drug globally, with sales of alcoholic beverages exceeding $1.5 trillion in 2017.
As a central nervous system (CNS) depressant, ethanol decreases electrical activity in the brain, leading to the characteristic effects of alcohol intoxication, including euphoria, decreased anxiety, increased sociability, sedation, and impairment of cognitive, memory, motor, and sensory functions. However, excessive alcohol consumption is associated with adverse health effects, including liver disease, cardiovascular disease, and an increased risk of certain cancers.
In addition to its presence in alcoholic drinks, ethanol has various other applications. It is commonly used as an antiseptic, disinfectant, solvent, and fuel. Ethanol is also found in cosmetic and pharmaceutical products, such as lotions, tonics, colognes, and perfumes. However, it is important to distinguish ethanol (ethyl alcohol) from other types of alcohols, such as methanol and isopropyl alcohol, which can be toxic when ingested.
Overall, ethanol (ethyl alcohol) plays a significant role in alcoholic drinks, contributing to their intoxicating effects and cultural significance, while also having important industrial and commercial applications.
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It is a psychoactive depressant and the second most consumed drug globally
The term "alcohol" in chemical formulary refers to ethanol or ethyl alcohol, which is the primary alcohol in alcoholic drinks. It is a simple alcohol with the molecular formula C2H6O and a molecular weight of 46.0684 g/mol. Ethanol is a volatile, flammable, colorless liquid with a slight odor. It is produced through the hydration of ethylene or by brewing via fermentation of sugars with yeast. The sugars are typically derived from sources such as steeped cereal grains, grape juice, or sugarcane products.
Alcohol is a central nervous system (CNS) depressant, reducing the electrical activity of neurons in the brain. This leads to the characteristic effects of alcohol intoxication, including euphoria, decreased anxiety, increased sociability, sedation, and impaired cognitive, memory, motor, and sensory functions. It is the second most consumed drug globally, after caffeine, with global sales exceeding $1.5 trillion in 2017. Alcohol has been a part of human culture for thousands of years, with evidence of alcohol consumption and production dating back to at least 7,000-6,650 BCE in China and 13,000 years ago in the Middle East.
As a psychoactive substance, alcohol alters brain function and has significant societal and cultural significance. Drinking establishments, social gatherings, and festivals often involve alcohol consumption, and it is considered a social lubricant. However, excessive consumption can lead to adverse health effects, including liver disease, cardiovascular disease, and polyneuropathy. Alcohol is also associated with societal issues such as drunk driving, accidental injuries, sexual assaults, domestic abuse, and violent crime.
Alcohol is addictive, and prolonged use can worsen symptoms of anxiety or depression due to changes in brain chemistry. It is often self-medicated to manage developmental issues, personality traits, and psychiatric symptoms. Despite the risks, alcohol is socially accepted and legal in most countries, contributing to its widespread consumption.
In summary, when the chemical formulary refers to alcohol, it specifically means ethanol, which is the main alcohol present in alcoholic drinks. Ethanol has a distinct chemical structure, production methods, and wide-ranging impacts on the human body and society as a whole, making it the second most consumed drug globally.
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Ethanol has many industrial uses, including as a solvent, antiseptic, disinfectant, and fuel
The term "alcohol" in the context of chemistry typically refers to ethanol or ethyl alcohol, which is the primary alcohol present in alcoholic drinks. Ethanol is a versatile compound with a wide range of industrial applications. Here are some of its key uses:
Solvent
Ethanol is a universal solvent capable of dissolving both polar, hydrophilic and nonpolar, hydrophobic compounds. This property makes it useful in various industries, including the production of paints, coatings, inks, and chemicals. In the food and beverage industry, ethanol is used as a solvent for colourants and flavourings. It is also employed as a solvent in perfumes, fragrances, and cosmetics, where it helps dissolve essential oils and aromatic compounds.
Antiseptic and Disinfectant
Ethanol has antiseptic properties, making it effective at killing bacteria and viruses. This characteristic is harnessed in the production of hand sanitizers, disinfectants, cleaning supplies, mouthwashes, and other antibacterial products. Its antiseptic nature also makes it valuable in hospitals and healthcare facilities, where maintaining sterile environments is crucial for patient safety.
Fuel
Ethanol is a valuable fuel source and can be used as an alternative to fossil fuels in industrial boilers, power plants, and automotive engines. It is derived from renewable resources, such as corn, sugarcane, wheat, and other agricultural products, making it a sustainable and environmentally-friendly option. Ethanol has a higher research octane number (RON) than gasoline, resulting in lower emissions of harmful tailpipe pollutants and improved ignition efficiency.
Pharmaceutical and Medicinal Applications
Ethanol is an important ingredient in pharmaceutical products, including medicines, vaccines, and disinfectants. Its medicinal properties have been recognized for thousands of years. It is often used as a natural product to extract and concentrate flavours and aromas for the food and beverage industry.
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Methanol is a common alcohol used as a solvent, raw material, and in antifreeze
The term "alcohol", in the context of chemistry, typically refers to ethanol (ethyl alcohol), which is the primary alcohol found in alcoholic drinks and is used as a drug. However, the term "alcohol" encompasses a broader category of compounds that contain hydroxyl functional groups. These compounds are typically given names ending in "-ol", such as methanol and propanol.
Methanol, also known as methyl alcohol or wood spirit, is a common alcohol with a variety of industrial applications. It is a light, colourless, volatile, and flammable liquid with a distinctive alcoholic odour similar to ethanol. As a solvent, methanol is used in the production of inks, resins, adhesives, and dyes. Additionally, it serves as a raw material for the synthesis of important pharmaceutical products, including cholesterol, streptomycin, vitamins, and hormones.
One of the critical properties of methanol is its ability to lower the freezing point and increase the boiling point of water-based liquids. This characteristic makes methanol particularly useful as an antifreeze. It is often added to windshield washer fluid to prevent it from freezing, and it is also injected into natural gas pipelines to lower the freezing point of water during oil and gas transport.
Methanol is also employed as a fuel in various applications. It can be used as a vehicle or marine fuel, and when blended with gasoline, it forms an efficient fuel known as methyl tertiary butyl ether (MTBE), which has lower emissions than conventional gasoline. Additionally, methanol is used in biodiesel, a renewable fuel source derived from plants or animal fat.
While methanol has numerous industrial uses, it is essential to handle it with caution. Methanol is toxic and can be fatal if ingested, even in small quantities. Ingesting as little as 10 mL of pure methanol can cause permanent blindness, and 30 mL is potentially fatal.
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Alcohols are organic compounds with a hydroxyl (OH) functional group on an aliphatic carbon atom
The term "alcohol" in chemistry originally referred to the primary alcohol ethanol (ethyl alcohol) , which is
The suffix "-ol" is indicative of an alcohol in chemical nomenclature. For example, the chemical name for ethanol is often written as CH3CH2OH, where the "-ol" ending denotes the presence of a hydroxyl group. The "-ol" ending is also seen in non-IUPAC names, such as paracetamol and cholesterol, indicating the presence of an alcohol group. The hydroxyl group gives alcohols their polar nature, allowing them to form hydrogen bonds with other compounds and with each other. This contributes to their higher boiling points compared to similar hydrocarbons and ethers.
Alcohols can be classified into primary, secondary, and tertiary alcohols based on the number of carbon atoms connected to the carbon atom bearing the hydroxyl group. The general formulas for these classifications are RCH2OH for primary, R2CHOH for secondary, and R3COH for tertiary alcohols. Methanol (CH3OH) and ethanol (CH3CH2OH) are the first two members of the homologous series of alcohols. These simple alcohols are found in nature in modest quantities but are also industrially synthesized for use as chemical precursors, fuels, and solvents.
Ethanol, in particular, has a wide range of applications beyond its role in alcoholic beverages. It is commonly used as an antiseptic, disinfectant, chemical and medicinal solvent, and fuel. However, it is important to note that most other types of alcohols are considered poisonous. While higher alcohols tend to be less toxic, ingesting significant quantities of certain alcohols, such as isopropyl alcohol, can have harmful effects.
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Frequently asked questions
Alcohol is a class of organic compounds characterised by one or more hydroxyl (―OH) groups attached to a carbon atom of an alkyl group (hydrocarbon chain). The term alcohol originally referred to ethanol, which is the main alcohol present in alcoholic drinks.
Alcoholic drinks include beer, wine, and distilled spirits (hard liquor).
Ethanol is a simple alcohol with the molecular formula C2H6O. It is a colourless liquid with a slight odour and is highly flammable. Ethanol is also known as ethyl alcohol or drinking alcohol.
Alcohol is a central nervous system (CNS) depressant, decreasing electrical activity in the neurons of the brain. This leads to the characteristic effects of alcohol intoxication, including euphoria, decreased anxiety, sedation, and cognitive impairment. Alcohol is toxic and can cause acute alcohol poisoning if consumed in large quantities.
In addition to ethanol, other types of alcohols include methanol (or methyl alcohol) and propanol. These simple alcohols occur naturally in modest quantities but are also synthesised industrially for various applications.
