Chemistry - Grade 9 Review

Adi Chhabra
Flashcards by Adi Chhabra, updated more than 1 year ago
Adi Chhabra
Created by Adi Chhabra over 5 years ago


Grade 9 - Properties of Matter

Resource summary

Question Answer
Matter Anything that has mass and takes up volume.
Pure Substances Matter that contains only one type of material and are uniform throughout. e.g. pure water
Mixtures Matter that contains two or more pure substances mixed together
Homogeneous mixture / Solution A mixture of one substance dissolved in another which cannot be seen; the different substances are evenly mixed in a solution
Heterogeneous / Mechanical mixture A mixture that contains more than one type of particle and the different particles are visible.
Particle theory of matter A theory that describes the composition and behaviour of matter
Postulate 1 of particle theory of matter All matter is made of particles and they have spaces between them.
Postulate 2 of particle theory of matter All substances have their own specific particles
Postulate 3 of particle theory of matter Particles are in constant motion
Postulate 4 of particle theory of matter Particles attract each other.
Postulate 5 of particle theory of matter Particles vibrate faster when heated.
Alloy A solid mixture of 2 or more metals e.g. solder is a combination of tin and copper
Physical property A characteristic of a substance that can be determined without changing the substance e.g. colour, texture, conductivity, state of form.
chemical property A characteristic of a substance that can be determined by changing the substance. e.g. flammability, combustibility, reactivity
Physical change A change in the physical state of form of matter without any change in the chemical composition and no new substances are formed. e.g. ice melting, chopping wood.
Chemical change A change in the the chemical composition of matter with the creation of new substances. e.g. exploding fireworks, burning fuel.
characteristic physical property A property that is unique to a substance and can be used to identify the substance e.g. Density, freezing point, melting point, boiling point,
Element A substance that cannot be made into simpler substances by ordinary means. E.g. Sodium (Na), Chlorine (Cl)
Compound A pure substance made of two or more different elements that are chemically combined. E.g. Table salt (NaCl)
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