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Classes of Matter, Main groups on the periodic table, Electrons and…
Classes of Matter
Elements and compunds
Compunds
A mix of two different elements.
Pure Substants
Only one type a particle/atom.
Mixtures
Homogeneous And heterogeneous
Heterogeneous
A mechanical mixture where the difference in visible
Homogeneous
A solution where the difference or ingredients can not be seen
Main groups on the periodic table
Alkali earth metals
"Fairly" reactive
Ex: Magnesium
Preferred charge: +2
Alkali metals
Very reactive
Ex: Sodium
Preferred charge: +1
Halogens
Highly reactive
Ex: Iodine
Preferred charge: -1
Noble gasses
Not reactive
Ex: Helium
Preferred charge: +0
Electrons and Protons
Electrons
A negatively charged particle
Protons
A positively charged particle
Exothermic reactions vs Endothermic reaction
Endothermic reactions
A reaction that gives absorbs heat from surrounding particles
Exothermic reactions
A reaction that gives off heat
Physical vs Chemical
Chemical Change Evidence
New Chemical compound
Original substance is used up
Emitting heat and/or heat is given off
precipitation
New color is created
gas bubbles formed ( without needing to be heated)
Impossible or very hard to reverves
Physical Change Evidence
Qualitative properties
Quantitative properties
Change of state
How to get amount of neutrons
Atomic number/ number of proton--Atomic mass/ Atomic weight.
Periodic Table
