Chemistry Flashcards
What is the difference between physical and chemical properties?
Physical can be observed without changing the identity of the substance.
Chemical is when a substance changes to a completely different substance
What is the difference between physical and chemical change?
Physical change is when it doesn’t change what the substance is.
Chemical change is when there is a chemical reaction and a new substance is formed.
What is the difference between metal and non metals
Metals: solid, shiny, good conductors of heat and electricity, are ductile, malleable, loose electrons easily.
Non-metals: brittle, non malleable or ductile, poor conductors of heat and electricity, and tend to gain electrons in chemical reactions.
Density
Amount of matter per unit volume of a substance
State of matter
Solid, liquid, gas
Malleability
Ability of a substance to be hammered or bent into different shapes.
Solubility
Ability of a substance to dissolve in a solvent.
Ductility
Ability of a substance to be pulled into a wire.
Viscosity
Describes how thick a liquid is/ability of a liquid to flow.
Lustre
Describes how much light can pass trough a substance
Describes how shiny and substance is
Hardness
A measure of a substances resistance to being scratched/dented
State of matter
The shape of the partials of a solid
What are the particles in a solid liquid and gas like
Solid: small spaces, move slow, strong force.
Liquid: medium size spaces, speed is medium, medium force.
Gas: large spaces, move fast, weak fast.
Five things to look for if a chemical change has occurred
- can it be changed back to it original state
- bubbles
- colour
- smell
- change in volume
D=
D= m/v= g/cm3
Group
Tells how many electrons are in the outside level
Periods
Tells how many energy levels each element has in that row
Mass number
Represents the sum of protons and neutrons in an atom
Atomic number
The number of protons and neutrons in an atom
Proton
Charge: +
Relative mass: 1 unit
Location: nucleus
Electron
Charge: -
Relative mass: 0.0005
Location: electron shells
Neutron
Charge: 0
Relative mass: 1 unit
Location: nucleus
Where are the metals located on the periodic tables
Middle/ left
Where are the non metals located on the periodic table
Right side
What is special about elements placed in the same column in the periodic table
They are in the same family/ group
What trend do you notice about elements in the same period on the periodic table
The energy level goes up by one each time
