Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Lesson 1 * Physical and Chemical Properties
Document related concepts
Transcript
Lesson 1 – Physical and Chemical Properties CHEMISTRY Learning Goals To be able to describe physical and chemical properties A physical property is an identifying characteristic of a substance that can be observed or measured to help identify it Qualitative physical properties are those you can observe with your senses Examples include physical state, odour, colour, texture, and lustre Quantitative physical properties are those you can measure and give a number value Examples include mass, volume, and temperature Property State Colour Taste Texture Description Condition of being a solid, liquid, or gas Substance can be red, orange, colourless or if it is a mixed colour it can be described as greenish-blue Sweet, sour, salty, or bitter The “feel” of an object, e.g. fine, silky, waxy, gritty, smooth Property Description Clarity Either transparent (clear), translucent (cloudy), or opaque (no light passes through) Odour The scent of a substance, e.g. odourless, burnt, flowery, putrid, spicy, sharp, choking, pungent Ability of an object to break apart or to Brittleness shatter easily – a substance which bends without breaking is flexible Lustre Ability of an object to reflect light; a shiny object has a high lustre, e.g. metal, described as shiny, dull, etc. Property Lustre Description Ability of an object to reflect light; a shiny object has a high lustre, e.g. metal, described as shiny, dull, etc. Determined by the resistance to being Hardness scratched; given on a scale of 1-10 with diamond being a 10 Solubility Ability to dissolve in another substance Measure of how easily a liquid flows; a Viscosity substance that does not flow easily has a high viscosity, e.g. honey Property Ductility Malleability Description Ability of a substance to be stretched into wire Ability to hammer or bend a substance into different shapes Ability of a substance to conduct or transfer Conductivity electricity or heat Density Amount of matter that occupies a certain amount of space A chemical property is a description of a what a substance does when it reacts to produce a new substance Combustibility A chemical property that describes the ability of a substance to burn In order for any substance to burn, it needs oxygen from the air Examples of combustible materials include matches, wood, and gasoline Reactivity Another chemical property that describes the ability of a substance to react easily with other substances (such as air, water, or acid) For example, iron will rust and silver will tarnish when exposed to air Light Sensitivity Some substances will become new substances when they interact with light An example would be hydrogen peroxide, often used as a disinfectant When this substance is exposed to light, it changes into water and oxygen gas, and is no longer useful Success Criteria I CAN describe the physical and chemical properties of a substance To Do… Activity Worksheet
