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Definitions in science
Lifestyle chemistry
50
Science
12th Grade
10/08/2012

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Term
Colloids 
Definition

a mixture having particles of one component, with diameters between 10-7 and 10-9 metres, suspended in a continuous phase of another component. The mixture has properties between those of a solution and a fine suspension 

Term
Consumers
Definition

A heterotrophic organism that ingests other organisms or organic matter in a food chain. 

Term
Cosmetic
Definition

A preparation, such as powder or a skin cream, designed to beautify the body by direct application 

Term
Detergent
Definition

A cleaning agent that increases the ability of water to penetrate fabric and break down greases and dirt. Detergents act like soap but, unlike soaps, they are derived from organic acids rather than fatty acids. Their molecules surround particles of grease and dirt, allowing them to be carried away 

Term
Dissolve
Definition

to go or cause to go into solution 

 

Term
Emulsion
Definition

A suspension of small globules of one liquid in a second liquid with which the first will not mix 

Term
Foam
Definition

A mass of bubbles of air or gas in a matrix of liquid film, especially an accumulation of fine, frothy bubbles formed in or on the surface of a liquid, as from agitation or fermentation. 

Term
Health
Definition

The overall condition of an organism at a given time. Soundness, especially of body or mind; freedom from disease or abnormality 

Term
Hygiene
Definition

The science that deals with the promotion and preservation of health 

Term
Insoluble
Definition

That cannot be dissolved 

Term
Lubricant
Definition

A substance, such as grease or oil, that reduces friction when applied as a surface coating to moving parts 

Term
Menisci
Definition

The curved upper surface of a nonturbulent liquid in a container that is concave if the liquid wets the container walls and convex if it does not 

Term
Mixtures
Definition

A composition of two or more substances that are not chemically combined with each other and are capable of being separated 

Term
Pesticides
Definition

A chemical used to kill pests, especially insects 

Term
Soap
Definition
a cleaning or emulsifying agent made by reacting animal or vegetable fats or oils with potassium or sodium hydroxide. Soaps often contain colouring matter and perfume and act by emulsifying grease and lowering the surface tension of water, so that it more readily penetrates open materials such as textiles
Term
Solubility
Definition

a measure of this ability for a particular substance in a particular solvent, equal to the quantity of substance dissolving in a fixed quantity of solvent to form a saturated solution under specified temperature and pressure 

Term
Soluble
Definition

capable of being dissolved, esp easily dissolved in some solvent, usually water 

Term
Solute
Definition

A substance dissolved in another substance, usually the component of a solution present in the lesser amount 

Term
Solutions
Definition

A homogeneous mixture of two or more substances, which may be solids, liquids, gases, or a combination of these 

Term
Solvent
Definition

A substance, usually a liquid, capable of dissolving another substance 

Term
Surface tension
Definition

A property of liquids such that their surfaces behave like a thin, elastic film. Surface tension is an effect of intermolecular attraction, in which molecules at or near the surface undergo a net attraction to the rest of the fluid, while molecules not near the surface are attracted to other molecules equally in all directions and undergo no net attraction 

Term
Surfactants
Definition

Also called surface-active agent a substance, such as a detergent, that can reduce the surface tension of a liquid and thus allow it to foam or penetrate solids; a wetting agent 

Term
Suspensions
Definition

a dispersion of fine solid or liquid particles in a fluid, the particles being supported by buoyancy 

Term
Emulsifying agent
Definition

substances added to an emulsion to prevent the coalescence of the globules of the dispersed phase. They are also known as emulgents or emulsifiers 

Term
Biodegradable
Definition

Capable of being decomposed by biological agents, especially bacteria 

Term
Skin
Definition

The membranous tissue forming the external covering or integument of an animal and consisting in vertebrates of the epidermis and dermis 

Term
Organ
Definition

A differentiated part of an organism, such as an eye, wing, or leaf, that performs a specific function 

Term
EndothermEndothermic
Definition

An organism that generates heat to maintain its body temperature, typically above the temperature of its surroundings; a homeotherm 

Term
EctothermEctothermic
Definition

An organism that regulates its body temperature largely by exchanging heat with its surroundings; a poikilotherm 

Term
Micro flora
Definition

microscopic plants; bacteria are often considered to be microflora 

Term
pH
Definition

A measure of the acidity or alkalinity of a solution, numerically equal to 7 for neutral solutions, increasing with increasing alkalinity and decreasing with increasing acidity. The pH scale commonly in use ranges from 0 to 14

 

Term
Acidity
Definition

The state, quality, or degree of being acid 

Term
Glands
Definition

A cell, a group of cells, or an organ that produces a secretion for use elsewhere in the body or in a body cavity or for elimination from the body 

Term
Perspiration
Definition

The fluid, consisting of water with small amounts of urea and salts, that is excreted through the pores of the skin by the sweat glands; sweat 

Term
Validity
Definition

Producing the desired results 

Term
Reliability
Definition

Yielding the same or compatible results in different clinical experiments or statistical trials 

Term
Alcohols
Definition

Any of a series of hydroxyl compounds, the simplest of which are derived from saturated hydrocarbons, have the general formula CnH2n+1OH, and include ethanol and methanol 

Term
Cosmetics
Definition

A preparation, such as powder or a skin cream, designed to beautify the body by direct application 

Term
Capsules
Definition

A small soluble container, usually made of gelatin, that encloses a dose of an oral medicine or a vitamin 

Term
Tablets
Definition

a medicinal formulation made of a compressed powdered substance containing an active drug and excipients 

Term
Enteric coated tablets
Definition

An enteric coating is a barrier applied to oral medication that controls the location in the digestive system where it is absorbed. Enteric refers to the small intestine, therefore enteric coatings prevent release of medication before it reaches the small intestine 

Term
Sub dermal implants
Definition

A subdermal implant consists of a small silicone tube which contains a limited supply of the required medication. Usually for convieniece this supply lasts for a number of years. The tube is inserted into the body at a point where it is safe to stay under the skin, but can still access the bloodstream. From here, it releases the required amount of medication into the blood, and is replaced as soon as it is spent 

Term
Digestive system
Definition

The alimentary canal and digestive glands regarded as an integrated system responsible for the ingestion, digestion, and absorption of food 

Term
Stomach
Definition

The enlarged, saclike portion of the alimentary canal, one of the principal organs of digestion, located in vertebrates between the esophagus and the small intestine 

Term
Small intestine
Definition

The narrow, winding, upper part of the intestine where digestion is completed and nutrients are absorbed by the blood. It extends from the pylorus to the cecum and consists of the duodenum, the jejunum, and the ileum

 

Term
Solubility
Definition

The amount of a substance that can be dissolved in a given amount of solvent 

Term
Absorption
Definition

The process by which one substance, such as a solid or liquid, takes up another substance, such as a liquid or gas, through minute pores or spaces between its molecules. A paper towel takes up water, and water takes up carbon dioxide, by absorption 

Term
Vitamins
Definition

Any of various fat-soluble or water-soluble organic substances essential in minute amounts for normal growth and activity of the body and obtained naturally from plant and animal foods 

Term
Water soluble vitamins 
Definition

water-soluble vitamins dissolve in water and are not stored; they are eliminated in urine. We need a continuous supply of them in our diets. The water-soluble vitamins are the B-complex group and vitamin C. 

Term
Fat soluble vitamins
Definition

Fat-soluble vitamins -- vitamins A, D, E and K -- dissolve in fat before they are absorbed in the blood stream to carry out their functions. Excesses of these vitamins are stored in the liver. Because they are stored, they are not needed every day in the diet 

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