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Description
Flashcards by Adi Chhabra, updated more than 1 year ago
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Created by Adi Chhabra
over 9 years ago
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| 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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