science test cuh Flashcards
(31 cards)
What are all the WHMIS symbols and what is their definition
Flammable - Will catch on fire easily and may self ignite
Oxidizer - Adds oxygen to the fire, causing it to burn more intensely
Corrosive - Will eat through metals or skin or cause damage on contact
Explosive - Can explode if dropped or exposed to air
Acute Toxicity - Will cause injury or death after a short exposure
Specific Organ Toxicity - Can injure one or more organs over time or cause cancer
Irritant - Can irritate skin, eyes, respiratory system
Gas Under Pressure - Contents are under pressure and could explode if heated
Environmental Hazard - Chemicals which are toxic to animals and plants
What are all GHS symbols
Flammable - Can easily catch on fire or self ignite
Explosive - Can explode if container is heated or punctured
Corrosive - Can burn skin, eyes, or through the stomach if consumed
Poison - Licking, eating, or sometimes smelling this product will cause death or illness
Hardness definition
ability to scratch or be scratched
Malleability definition
ability to be molded
Melting Point
temperature where something melts
Boiling point
the temperature where an object boils
Viscosity
ability to flow
Solubility
The ability of a state to dissolve in liquid
Clarity
how transparent is it
Odour
the ability to produce a smell
Lustre
shininess or dullness
brittleness
breakability or flexability
What is the order in which the scientists discovered the atom?
Dalton, Thompson, Rutherford, Bohr
What did Dalton discover
All matter is made of atoms
They cannot be created or destroyed
All atoms of the same element are identical in mass and size
- Billard Ball model
What did Thompson discover
subatomic particles in the atom
electrons negatively charged within the atom
What did Rutherford Discover
All atoms contain a nucleus which contains protons and neutrons
The negatively charged electrons circle in orbits outside of the nucleus
Explain the gold foil experiment
Thomson expected most positive particles would past straight through the gold foil, yet some bounced slightly off and backwards, leading him to form the idea of a positively charged nucleus.
What did Bohr discover?
Electrons could only move in fixed regions, energy levels
Each shell can only hold a certain number of electrons
Physical change meaning
It only changes it’s physical state, there are no new elements and the element present at the start is always present throughout
Chemical change meaning
A new element or substance is created or a reaction by mixing two different substances to create a reaction
Chemical change signs
Change in:
Colour
Temperature
Odour
Bubbling/fizzling
smell
Ductility
the ability to be pulled into finer stands
What is Archimedes principle?
the amount of water displaced is equal to the volume of the object
How to calculate density (formula)
D = M/V
