Units 13-14 Flashcards
Yellow triangle means…
Caution
Orange diamond means…
Warning
Red octagon means…
Danger
WHMIS:
Workplace Hazardous Materials Information System
MSDS:
Material Safety Data Sheet
MSDS identifies…
Chemical and Physical hazards
MSDS includes
Boiling point, Toxicity, Health effects, First Aid, and Spill and Leak Procedures
Physical Change:
Change to a substance in which the composition of the substance stays the same
Physical Change…
Freezing
Chemical Change:
Change in a substance that always results in the formation of a different substance or substances
Sterilization is…
Any process that kills micro-organisms
Salting:
Is a method that preserves meat and fish in a form of drawing
Fermentation:
Biochemical preservation
Metallurgy:
Science of producing metals
Gold was not used because…
It was to soft to work with
Annealing is…
The heating of copper before it is hammered
Artisole’s description was…
All matter was composed of combination of Fire, water, and air
Democritus proposed that…
Matter was made up of particles that could not be divided into smaller pieces
He called them Aromas meaning…
Invisible
Alchemy was a combination of…
Science and Magic
Atoms:
Smallest part of an element that still has the properties of the element
Robert Boyle measured relationships between…
Volume and pressure of gases
He concluded that gases are made up of…
Tiny particles that group together
Antoine Lavoisier measured the masses of the…
Substances that reacted together and the substances produced in a chemical reaction
Law of Conservation of Mass:
total mass of the reactants in a chemical reaction equals the total mass of the products
John Dalton
Based his model of the atom on experiments he did in combining elements
All matter is made up of small…
Invisible particles called atoms
All atoms of different elements are
Identical in properties such as size and mass
Atoms of different elements have…
different properties
Atoms of different elements can combine in…
Specific fixed ratios to from new substance
J.J. Thomson discovered the…
Electron
Thomson was experimenting with beams…
of particles produced in a vacuum
The beam was made of…
Negative charges
Different elements contained…
Smaller particles that were identical
His model stated that all atoms are made up of smaller….
Subatomic particles put together in different combinations put together in different combinations
Suggested the the atom is a sphere of positive charge in which…
Negative particles are imbedded
Ernest Rutherford worked with…
Radioactive substances
Radioactive substances release…
Energy or charged particles
Suggested that an atoms is mainly empty space through which the positive…
Particles could pass, but each atom had tiny, positively charged core
Neils Bohr proposed that electrons surrounded…
The nucleas in specific energy levels by examining the light released by hydrogen atoms
The Quantum Mechanical Model of the Atom uses a…
Mathematical probability to describe how electrons exists in atoms
Electrons occupy the whole space all…
At once at different energy levels
