Last Modified: 2011-07-13
matter is neither created nor destroyed during ordinary chemical or physical changes.
a chemical compound contains elements in exactly the same proportions by mass
if 2 or more compounds are composed of the same element, then the ratio of the masses of the second element combined with the certain mass of the first element always a ration of small whole numbers.
1. All matter made up of tiny particles called atoms.
2. Atoms of a given element are alike in size, mass, and properties. Atoms of different elements are different in size, mass and properties.
3. Atoms cannot be created, subdivided or destroyed.
4. Atoms of different elements ‘combine in simple whole number ratios, forming compounds.
5. Atoms are combined, separated, or rearranged in chemical reactions.
discovered the electron and its charge to mass ratio using cathode ray experiment.
measured the charge of the electron and calculated its mass using an oil drop experiment .
- Made up of a stream of electrons
- Glow is caused by a stream of negatively charged particles
- Led to the discovery of the electron
- Cathode and Anode on each side
a general term for any isotope of any element.
the amount of a substance that contains as many particles as there are atoms in exactly 12 grams of carbon -12.
the study of the composition, structure, and properties of matter and changes it undergoes.
the study of all substances not classified as organic, mainly the compounds that do not contain carbon.
the study of properties and changes of matter and their relation to energy
the identification of the components and composition of materials.
the use of mathematic and computers to understand the principles behind observation observed chemical behavior and to design and predict the properties of new compounds.
involves the production and use of products that improve our quality of life.
characteristics that can be used to identify or classify substances.
a change in a substance that does not involve a change in the identity of the substance
i. Grinding, cutting, melting, and boiling
a change in which one or more substance(s) is converted into different substance(s).
do not depend on the amount of matter
i. Melting point, boiling point, density, ability to conduct electricity and heat
Quality sought= quality given * conversion factor
should have the same number of decimal places as the measurement with the fewest decimal places.
should have the same number of significant figures as the measurement with the fewest decimal places.
increases by 1
increases by 1
increases by 1
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