Density
D=m/V
What is the formula for specific heat?
q=mCsT
This is the simplest whole-number ratio of elements in a compound.
Empirical Formula
Given the balanced equation:
2H2+O2 -> 2H2O
If you start with 4 moles of H2, how many moles of water will be produced?
4 moles of water
A metal block has a mass of 150 g and a volume of 50 cm2. What is the density of the metal block?
3.0 g/cm2
What is the specific heat of water?
4.184 J/goC
The empirical formula of C6H12O6
CH2O
How many grams of carbon dioxide are produced from the complete combustion of 88 g of propane (C3H8).
132 g of carbon dioxide
A substance will float in water if its density is less than this value.
1.0 g/mL
This is the amount of heat required to raise 10 g of iron (c = 0.45 J/g°C) by 20°C.
90 J
A compound has 40% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. This is its empirical formula.
CH2O
How many liters of oxygen gas (O2) at STP are needed to react with 5 moles of hydrogen gas (H2) in the reaction below?
2H2+O2 -> 2H2O
56.0 L of O2
A gas at STP has a density of 1.25 g/L. Given that D=m/V, this is the molar mass of the gas.
28.0 g/mol
When heat is added to a system but temperature doesn’t change, this phase transition might be occurring.
Melting or boiling
A compound has an empirical formula of CH and a molar mass of 78 g/mol. This is its molecular formula.
C6H6
If you have 50 g of aluminum (Al) reacting with excess oxygen (O2), how many grams of aluminum oxide (Al2O3) can be produced?
94.4 g of Al2O3
The density of a liquid changes with this property due to molecular expansion
Due to temperature.
The reason metals have lower specific heat values compared to water.
What is their lower capacity to store heat energy per unit mass?
Given that the molecular formula is always a multiple of the empirical formula, this is the molecular formula of a compound with an empirical formula of NO2 and a molar mass of 92 g/mol.
N2O4
How many molecules of water are produced when 10 g of hydrogen gas reacts with excess oxygen?
3.0 x 1024 molecules of H2O