EXAM I Flashcards
(51 cards)
Matter
Anything that has mass and takes up space
Substance
A single chemical
One kind of matter
Mixture
A sample of matter that contains two or more chemicals
Solution
A homogenous mixture
Homogenous
A sample which has a uniform appearance and composition throughout
Heterogenous
Different phases
Usually visible
Element
A pure substance which can be separated into other stable pure substances
Compound
A pure substance which can be decomposed by a chemical change or into 2 or more other pure substances
Atom
The smallest unit particle of an element
Physical property
Can be described by senses
A measurable property
Chemical property
Properties defined by the type of chemical changes possible
Physical change
New form of old substance
No new substances formed
Law of Multiple Proportions
When 2 elements combine, it is always in a simple ratio of whole numbers
Law of Conservation of Mass
In a chemical change, mass is conserved. It is neither created or destroyed
Law of Conservation of Energy
In a chemical change, energy is conserved. It is neither created or destroyed
Chemical Change
Old substances destroyed
New substances formed
H
Hydrogen
He
Helium
Li
Lithium
Be
Beryllium
B
Boron
C
Carbon
N
Nitrogen
O
Oxygen
