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15 Cards in this Set
- Front
- Back
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chemistry |
the study of the properties of matter and the changes it undergoes |
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homogeneous |
a mixture in which particles are uniformly scattered; has a uniform composition
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heterogeneous |
a mixture in which particles are not uniformly scattered; does not have a uniform composition |
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physical change |
a change in form but not in chemical composition ; no new substances are formed |
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chemical change |
a change in which one or more new substance is produced |
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law of conservation of mass |
in a chemical change, the total mass of the new substances is always the same as the total mass of the original substances |
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law of definite proportion |
compounds are pure substances that contain two or more elements combined together in fixed (or definite) proportions |
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electrolysis |
the process of decomposing a chemical compound by passing an electric current through it |
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Dalton's atomic theory |
states that:All matter is made up of small particlescalled atoms; Atoms cannot becreated, destroyed, or divided intosmaller particles; All atoms of thesame element are identical in massand size. Atoms of one element aredifferent in mass and size from theatoms of other elements; Compoundsare created when atoms of differentelements link together in definiteproportions. |
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element |
a pure substance made up ofone type of particle, cannot bebroken down into simpler substancesby means of a chemical change |
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compounds |
pure substances that aremade up of two or moreelements chemically combinedtogether; can be broken down intoelements again by chemical means |
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electrons |
negatively chargedparticles |
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atomic nucleus |
the centre of the atom;contains the protons and neutrons |
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proton |
positively charged particlefound inside the atomic nucleus |
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neutrons |
uncharged particles in theatomic nucleus |
