Atoms
Atomic number is determined by the number of __________ in an atom.
protons
Elements with similar properties fall into the same __________.
(period or group?)
group
Is the compound CCl4 ionic or covalent?
covalent
What unit is used for molar mass?
g/mol
What do you change to balance a chemical reaction?
Coefficients
If an atom contains 5 protons and 7 electrons, what is its overall net charge?
-2
Is sodium a metal or a nonmetal?
metal
What is the name of the compound SF6?
sulfur hexafluoride
What number represents the mole?
6.02 x 1023
What is a solid called that separates from a solution in a chemical reaction?
precipitate
_____________ are atoms of the same element with different mass numbers.
Isotopes
What is a negatively charged ion called?
anion
What is the chemical name for water?
dihydrogen monoxide
What is the molar mass of water?
18.02 g/mol
List the 7 diatomic molecules.
H2, N2, O2, F2, Cl2, Br2, I2
Who is credited for discovering neutrons?
James Chadwick
How many valence electrons does nitrogen have?
5
What is the name of the compound NaOH?
sodium hydroxide
What is the percent composition of sodium in sodium chloride?
39%
What type of reaction is C2H4 + 3 O2 --> 2 CO2 + 2 H2O ?
combustion
What experiment led to the discovery of the neucleus of the atom?
Gold Foil Experiment
Who organized the periodic table by increasing atomic mass?
Dmitri Mendeleev
What is the name of the compound Ti(SO4)2?
titanium (IV) sulfate
How many grams are in 2.86 x 1024 atoms of silver?
512 g
Balance the following equation:
C8H18 + O2 --> CO2 + H2O
2, 25, 16, 18