Elements: • A pure substance containing only one kind of ____. • An element is always uniform all the way through (homogeneous). • An element cannot be separated into simpler materials (except during ____ reactions). • Over 100 existing elements are listed and classified in the ____ . Compounds: • Compounds are a ____ substance containing two or more kinds of atoms. • The atoms are chemically combined in some way. Often (but not always) they come together to form groups of atoms called ____. • A compound is always homogeneous (uniform). • Compounds ____ be separated by physical means. Separating a compound requires a chemical reaction. Mixtures: • Mixtures contain two or more elements or compounds ____ chemically combined. • No reaction occurs between substances. • Mixtures can be uniform (also termed ¬¬____). • Mixtures can also be non-uniform (called ____). • Mixtures can be separated into their components by chemical or physical means. Conduction The process by which ____ is directly transmitted through the material of a substance when there is a difference of ____ between ____ regions, without movement of the material Convection The movement caused within a ____ by the tendency of hotter and therefore ____ dense material to rise, and colder, ____ material to sink under the influence of ____, which consequently results in transfer of heat. Radiation Thermal radiation is ____ radiation generated from the heat that results from the random movement of ____ and protons in a material. All matter with a temperature greater than absolute ____ emits thermal radiation. Thermal radiation does not require a ____ through which to travel. An ____ is the building block of all things in the universe. It is the ____ unit into which matter can be divided without there being a release of electrically charged particles. ____ are attracted to the positive charge within the atom. An ____ is a substance that cannot be broken down into any other substance. Each element is made up of its own unique type of atom. ____ is an element. A ____ is defined as a group of two or more atoms. This is the smallest unit into which a ____ substance can be divided. ____ describes how easily an atom or ____ can combine with other chemical species. The process by which ionic substances are decomposed (broken down) into simpler substances when an electric current is passed through them is called ____ • ____ charged ions move to the negative electrode (____) . They receive electrons and are reduced. • ____ charged ions move to the positive electrode (____) . • They lose electrons and are ____. • The substance that is broken down is called the ____. • A typical application of the process is ____ of kitchen utensils, car parts etc. • Safety considerations - Due to the process and materials used extraction must be used to remove ____ and other contaminates from the area that the process is being carried out within. ____ motion involves movement in a ____ line, for example a train moving down a straight, horizontal track. ____ motion occurs when something moves around an axis or ____ point, for example a bicycle wheel. ____ motion involves a curved backwards and forwards movement that swings on an axis or pivot point, for example a swing or a clock ____. ____ motion has a repeated up and down movement or back-and-forth movement, for example a ____ or a pump. A ____ is a physical effect that when exerted on an object can cause it to move, change its state of motion or deform it. The three key characteristics of a force are ____, direction, point of ____. The process in which a metal is deposited over any metallic or non-metallic surface is called ____. This is usually used to protect the metals from ____ by atmospheric air and moisture • A typical application of the process is ____, the ____ of metals, changing the texture of metal surfaces and preventing corrosion. • Safety considerations - workers can develop short term health problems such as throat, lung, skin and eye issues, burns and long term health problems such as asthma, skin, heart, lung and nerve disorders and, in some cases, cancer.

Unit 05 - Missing Words

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