Atomic History
Who first proposed atoms?
Democritus
What are the three states of matter?
Solid liquid and gas
What is H₂O?
Water
What are Lewis dot structures?
it shows valence electrons
What is pH a measure of?
Acidity or basicity of a solution
Who made the plum pudding model?
J.J. Thomson
What state of matter has a definite shape?
Solid
What are chemical formulas?
A chemical formula is an expression that shows the elements in a compound.
How many valence electrons does oxygen have?
6
pH of pure water?
7
Who discovered the nucleus?
Ernest Rutherford
What state of matter takes the shape of its container?
Liquid
How many atoms are in CO₂?
3 atoms
Draw the Lewis structure of H₂O
O in center 2 bonds to H 2 lone pairs
Is lemon juice acidic or basic?
acidic
Who proposed electrons move in orbits?
Niels Bohr
What happens to a solid when it melts?
becomes a liquid
What is the difference between CO and CO₂?
CO has one oxygen atom and CO₂ has two oxygen atoms
How many lone pairs are in the Lewis dot structure of NH₃?
One lone pair
pH of a strong base like NaOH?
Around 13-14
What did James Chadwick discover?
Neutron
what is a plasma?
A state with charged particles
What is the molar mass of H₂O?
18 g/mol
Why is CO₂ linear in Lewis structure?
Carbon has 2 double bonds and no lone pairs
Why does vinegar have a low pH?
Because it has many hydrogen ions