WHMIS, naming, and Scientists Flashcards
Who suggested that matter was composed of atoms?
Democritus and Leucippius.
Democritus and Leucippius.
Who suggested that matter was composed of atoms?
10 WHMIS symbols, their names, meanings, and examples.
Flame: Flammable: can continue to burn without a source of ignition.
Flame over circle: Oxidizing material. Removes electrons from something. Such as chlorine which can strip electrons off of lungs. Ozone.
Gas cylinder: compressed gas.
Corrosive/Corrosion: a substance that can cause damage to materials or tissues. Bases and acids.
Skull and crossbones: Poisonous and toxic, immediate and serious toxic effects. Hydrogen cyanide.
Health hazard (person with the spiky thing in the middle): May cause serious health effects. Carcinogenic. Asbestos.
Exclamation Mark: Causes less serious health effects or can damage the ozone layer. Such as CFCs, old deodorants and coolers.
Environment (tree and fish): Damages aquatic environments. CuSO4 (copper sulphate).
Exploding bomb: Explosive, rapid release of energy. TNT.
Biohazardous: Transmissible infection with serious health effects. HIV, bodily fluids. Often found on used needle bins.
Who suggested that atoms were different sizes, had regular geometric shapes, and are in constant motion.
Plato
Plato
Who suggested that atoms were different sizes, had regular geometric shapes, and are in constant motion.
Who believed that Ether was the 5th element.
Aristotle, Plato’s pupil.
Aristotle, Plato’s pupil.
Who believed that Ether was the 5th element.
Who proposed that atoms were made of solid spheres, all atoms of the same element were identical, atoms combine to form compounds, and that atoms of one element could not be changed into another.
John Dalton
John Dalton
Who proposed that atoms were made of solid spheres, all atoms of the same element were identical, atoms combine to form compounds, and that atoms of one element could not be changed into another.
Who discovered electrons, and believed they were scattered in an atom like “plumbs in a plumb pudding”.
Sir Joseph John Thomson
Sir Joseph John Thomson
Who discovered electrons, and believed they were scattered in an atom like “plumbs in a plumb pudding”.
Ernest Rutherford
Who discovered that the nucleus existed and protons existed? They used a gold foil experiment.
Who discovered that the nucleus existed and protons existed? They used a gold foil experiment.
Ernest Rutherford
Who proposed that electrons existed in different energy levels.
Niels Bohr
Niels Bohr
Who proposed that electrons existed in different energy levels.
