Module #1 - Measurements and Units
What is matter?
Anything that has mass and takes up space!
What is the law of mass conservation?
Matter can't be created or destroyed; it can only change forms.
What is a pure substance?
A substance that contains only one element or compound.
What is a decomposition reaction?
A reaction that changes a compound into its original elements.
What is a formation reaction?
A reaction that starts with two or more elements and produces one compound.
If an object has a volume of 45.1 mL, what is it volume in liters?
0.0451 L
How can you experimentally determine whether a compound is ionic or covalent?
An ionic compound will conduct electricity when dissolved in water.
If a liquid goes through a phase change and all you know is that the molecules sped up and moved farther apart, what phase did the liquid turn in to?
The liquid turned into a gas.
What is a complete combustion reaction?
A reaction in which O2 is added to a compound containing carbon and hydrogen, producing CO2 and H2O.
What is Avogadro's number?
6.02 X 1023
Convert the number 0.00341 to scientific notation.
3.41 X 10^-3
Is NaCl covalent or ionic?
Ionic
What kind of mixture is cereal in milk?
Heterogeneous mixture
What is the mass of a nitrogen atom in grams? (1.00 amu = 1.66 X 10-24 grams)
2.32 X 10-23 grams
What is the mass of a Ca atom in kg? (1.00 amu = 1.66 X 10-24 grams)
6.66 X 10-26 kg
If the mass of a liquid is 23.13 grams and its volume is 35.0 mL, what is its density?
.661 g/mL
What is the chemical formula for dinitrogen tetrahydride?
N2H4
Balance the following equation:
C5H12 + O2 -> CO2 + H2O
C5H12 + 8O2 -> 5CO2 + 6H2O
How many moles are in 34.5 g of NaBrO3?
0.229 moles
What is the mass of a Pr atom, in kg?
2.34 X 10-25 kg
What is the mass of 0.67 liters of gold? The density of gold is 19.3 g/mL.
13,000 g
In making calcium chloride, 100.0 grams of calcium plus 100.0 grams of chlorine makes 156.5 grams of product along with some left over calcium. How much chlorine and calcium should be added together in order to make 1.000 kg of calcium chloride without any left overs?
639.0 g of chlorine and 361 g of calcium to make 1.000 kg of calcium chloride.
Balance the following equation:
CO2 + H2O -> C18H32O16 + O2
18CO2 + 16H2O -> C18H32O16 + 18O2
If a chemist has 12.3 moles of N2H4O3, what is the mass of the sample?
984 g
Which sample has more atoms in it: 150.0 grams of Gold (Au) or 10.0 grams of lithium?
The 10.0 grams of lithium has more atoms than 150.0 grams of Au because it has more moles.