Section 4- Chemistry Flashcards
What are the two types of matter changes
Physical change: solid liquid gas
And chemical change: change in chemical composition, matter into something new with new properties
What makes an atom and what are their properties
What are they called
Protons: heavy, centre, positive charge
Neutrons: centre, no charge, heavy
Electrons: buzzing around the outside, negative, tiny, orbitals or shells,
They are called subatomic particles
What makes one atom different from another
The amount of protons neutrons and electrons
Chemistry terms elements and atoms, compounds and molecules, pure substance and mixtures
An element is one type of atom but does not refer to how much
An atom is the smallest form in which an element can exist
A Compound is the combining of different types of elements from what.
Mixtures are different compounds combining
Chemistry term table part one
Matter
Pure substance
Atoms and elements (any element on periodic table)
Molecules and compounds (made of different elements, but new things lure throughout)
Chemistry table part two
Matter
Mixtures (different throughout)
Heterogenous mixtures (mechanical mixtures can see different “trail mix”)
Homogeneous mixtures (look the same but are not “salt water” “blood”
Gas to liquid Liquid to solid Solid to liquid Liquid to gas Solid to gas
Condensation Freezing or solidification Melting Evaporation Sublimation
What is physical change?
Is a change in state or mater
Solid, liquid, gas
What is chemical change?
It is a change in matter type, where atoms and elements are re arranged to form something new wi completely new properties
We express chemical change using equations
What is a chemical equation ?
HCI+NaOH—-> NaCl+H2O
Reactant. Products
Early history When How many elements First chemists were called New simple forms were called
As early as 450 bc there were elements
Only 4 elements “water air earth fire”
First chemists were called alchemists
The new simple forms were called elements
By definition
Chemistry
Matter
Chemistry is the study of matter
Matter is anything with mass or volume
Naming elements:
People places gods space objects
Einsteinium mendilium
Californium berkelium euporium
Thorium helium
Plutonium euranium
Organizing new elements: who and how
Mendeleev: groups new elements by mass, by comparing to element carbon, filled a grid with new elements
Metal like objects non metal like objects
Metal Shiny Maleable Ductile Good conductors Solid at room temp
Non metal Dull Brittle Breaks easily Bad conductors Gas at room temp
