### hydrocarbon:

Lamp oil
* Many lamp oils come in pretty colors and scents that are very attractive to a small child.
* can be very toxic if ingested by young children.
* come in a variety of soft-drink colors and look tasty to children.
* consists of a combination of petroleum distillates that differ by manufacturer.
* contains a petroleum distillate which can cause severe respiratory distress when ingested.
* inflames the lungs, cuts oxygen to the blood and damages the kidneys.
* is fuel

Octane
* are alkane
  - chemical compounds
  - hydrocarbons
  - liquids
* helps the engine resist premature ignition.
* measures a fuel's resistance to engine knock.

Saturated hydrocarbon
* are easier to degrade than unsaturated hydrocarbons.
* have only single bonds and consequently are straight chains.

### hydrocarbon:

Tar
* also damage the lungs, leading to serious breathing problems.
* are byproducts formed when coke is made from coal or charcoal is made from wood
  - full time support reservists who can serve a twenty-year active duty career
  - poisonous chemical compounds which collect in the lungs and can cause cancer
  - products of the distillation of coal
* can harm the skin in the form of irritation, rashes, sensitivity and skin cancer.
* contain many poisons including some which are carcinogenic and some, which affect circulation.
* decompose very slowly and are still found in soil after many years.
* give blood to aid pneumonia patients.

### hydrocarbon | tar:

Coal tar
* can also cause photosensitivity which makes a patient more susceptible to sunburn
  - irritate the skin and even cause dermatitis
  - make the skin more sensitive to ultraviolet and sunlight
* general term applied to all varieties of tar obtained from coal.
* gives rabbits cancer in experimental proof of carcinogenesis.
* has been used for many years, the major drawback being it has a strong odor and stains.
* is also a source of hydrocarbons
  - flammable and is frequently used in medicated shampoos designed to kill head lice
  - pitch
  - produced from coal as a byproduct of coke production
  - the source of many synthetic B vitamins
* is used primarily in the treatment of chronic psoriasis
  - to treat eczema, psoriasis, seborrheic dermatitis, and other skin disorders
* known carcinogen.
* made from beech wood is used to protect wood from rotting.
* residue in the manufacture of coal gas and coke.

### hydrocarbon:

Terpene
* All terpenes are local irritants.
* Many terpenes are volatile and are driven off during burning along with water vapor
  - have medicinal properties, though many also are toxic
* Most terpenes found in conifers are volatile and evaporate during warm days.
* Some terpenes oxidize rapidly, which changes the aroma, longevity and solubility of the oil.
* are a class of chemicals known to inhibit herbivory
  - all local irritants
  - citrus based hydrocarbon solvents
  - excellent organic solvents, and can be used for dissolving oil soluble materials
  - molecules that are composed of two units of isoprene
* are oils extracted from citrus peels or pine bark, such as d-limonene
  - isolated from plants through gentle heating or steam distillation
* are organic matter
  - solvents that are derived from citrus or pine oil
  - plant-derived hydrocarbons
  - the chemicals removed from evergreen trees to make turpentine
  - widespread in nature, mainly in plants as constituents of essential oils
* generally have a strong odor, even at low concentrations thus they are easy to recognize.
* make up the largest proportion of plant secondary metabolites.
* provide a wide array of functions in plants.
* represent the major group of secondary metabolites isolated from opisthobranchs.