Its the Atoms that Count!
How many sulfurs are in CdSO3 ?
1
(s) is the symbol for what state of matter?
Solid
The conservation of mass states that the total mass (or atoms) after a reaction must be __________ to the total mass (or atoms) before a reaction.
Equal
32 g/mol
The atomic number (or the number of protons) of calcium is __________.
20
How many oxygens are in Sr(HCO3)2?
6
True or false: H2O is a reactant of the following equation: C2H6 + 7 O2 --> 4 CO2 + 6H2O
FALSE
To balance an equation, you must change the _____ which tells how many that molecule are in the reaction.
Coefficient
What is the total mass of 2CO2 ?
88g
The family (vertical column) tells you how many electrons an atom has in its outer electron shell, which are called _______.
valence electrons
3H2O : what does the 2 mean?
The 2 is a subscript. It tells us there are 2 hydrogens in a water molecule.
(aq) is the symbol for what state of matter?
Aqueous (not Aquarius) - which is any solid dissolved in water
Balance the equation by identifying the missing coefficients:
____ H2 + O2 --> ____ H2O
2, 2
How many moles are there in 99 g of CO?
3.53 moles
How many electrons does S2- have?
18
3H2O : what does the 3 mean?
The 3 is a coefficient. This tells us there are 3 molecules or 3 moles of H2O.
The mass (grams) of 1 mole of a molecule/atom is called the:
Molar mass
Balance the equation by identifying the missing coefficients: ____Ca(ClO3)2 ----> ____CaCl2 + 3O2
1, 1
How many moles of Mg are in a sample of 72.9g?
3 moles
Which atom has a larger ionization energy: Li, Rb, Fr
Li
Identify how many atoms of each element there are in the following molecule: 2Al(OH)3
2 Al
6 O
6 H
How many molecules are in a mole? (You don't actually need to know this for this class - but its fun to know!)
a. 525600
b. 6.022x10^23
c. 3.14159x10^23
d. 2
B
Balance the equation by identifying the missing coefficients.
___ K + ___ B2O3 ----> 3K2O + 2B
6, 1
If the following reaction produces 2 moles of Al(OH)3, how many moles of H2O were used? AlN + 3H2O ---> NH3 + Al(OH)3
6 moles of H2O
B3+ and F- form what molecule?
BF3