Units 13-14 Flashcards by Sabrina werstuik

Yellow triangle means…

Caution

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Orange diamond means…

Warning

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Red octagon means…

Danger

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WHMIS:

Workplace Hazardous Materials Information System

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MSDS:

Material Safety Data Sheet

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MSDS identifies…

Chemical and Physical hazards

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MSDS includes

Boiling point, Toxicity, Health effects, First Aid, and Spill and Leak Procedures

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Physical Change:

Change to a substance in which the composition of the substance stays the same

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Physical Change…

Freezing

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Chemical Change:

Change in a substance that always results in the formation of a different substance or substances

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Sterilization is…

Any process that kills micro-organisms

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Salting:

Is a method that preserves meat and fish in a form of drawing

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Fermentation:

Biochemical preservation

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Metallurgy:

Science of producing metals

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Gold was not used because…

It was to soft to work with

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Annealing is…

The heating of copper before it is hammered

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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