Elements
What is the first element on the periodic table?
hydrogen
CH4+O2→CO2+H2O
CH4+2O2→CO2+2H2O
What did Democritus say about atoms?
Democritus said the smallest piece of matter was an atom
What kind of reaction is this?
Zn + CuSO4 → ZnSO4 + Cu
single replacement
What are the horizontal rows called in the periodic table?
periods
What are the 3 coin age metals?
gold,copper and silver
H2+O2→H2O
2H2+O2→2H2O
Dalton said that atoms can break. True or false
false
What kind of reaction is this?
2 CO + O2 → 2 CO2
synthesis
What are the vertical rows called in the periodic table?
What element makes up 78 percent of air?
nitrogen
H2O2→H2O+O2
2H2O2→2H2O+O2
What experiment did Rutherford do?
The Gold foil experiment
What kind of reaction is this?
Mn + 2 HBr → MnBr2 + H2
single replacement
metals,nonmetals,metalliods
What is the only liquid on the periodic table?
H2SO4+NaOH→Na2SO4+H2O
H2SO4+2NaOH→Na2SO4+2H2O
What did Bohr say about about electrons and the nucleus?
Bohr said electrons orbit around the nucleus
What kind of reaction is this?
5 HClO2 → 4 ClO2 + HCl + 2 H2O
decomposition
What 2 groups of elements are cut off of the periodic table?
Lanthanides and Actinides
What is the rarest natural accruing element?
astaine
Fe+O2+H2O→Fe(OH)3
4Fe+3O2+6H2O→4Fe(OH)3
What did Chadwick discover about atoms?
Discovered the neutron
What kind of reaction is this?
C2H5OH + 3 O2 → 2 CO2 + 3 H2O
combustion
What is the periodic law?
When elements are arranged in order of increasing atomic number, there is a periodic repetition of their chemical and physical properties.