Stoichiometry
How many moles are in 18.02 g H₂O?
1 mol
An element with the same number of protons and a different number of neutrons
What is an isotope?
A property of a substance that can be observed without changing it into another substance
What is a physical property?
Agreement among repeated measurements
What is Precision?
The number of significant figures in this number: 0.0025
What is 2?
Theoretical yield = 20.0 g, actual yield = 18.0 g. What is percent yield?
90%
Total number of protons + neutrons
What is the Mass Number (A)?
A property of a substance that can be observed only by reacting it to form another substance
What is a chemical property?
Agreement between a measured value and the true value
What is accuracy?
Physical quantity that is given in units of kilograms
What is mass?
Reaction: 2H2 + O2 → 2H2O
If 4.00 g H₂ reacts with excess O₂, how many grams of H₂O form?
35.7 g H2O
Total number of protons
What is the atomic number (Z)?
A property that is independent of the amount of substance present (and provide an example)
What is an intensive property? What are density, melting point, etc...
The ratio of an objects mass per unit volume
What is density?
The number of significant figures in this value: 4.008
What is 4?
How many grams of CO₂ are in 1.50 mol CO₂?
66 g
Bonding type where electrons are exchanged
What is ionic bonding?
A property that varies with the quantity of the substance present (and provide an example)
What is an extensive property? What are mass, volume, etc...
Mixture where components are uniformly distributed
What is homogenous?
Physical quantity that is given in units of Kelvin
What is temperature?
Reaction: 2Na + Cl2 → 2NaCl
If 4.60 g Na reacts with 10.0 g Cl₂, which reactant is limiting? How many grams of NaCl form?
Na is limiting, 11.7 g NaCl produced
Bonding type where electrons are shared
What is covalent bonding?
An example of a method that can be used to separate substances
What are distillation, filtration, chromatography...
Mixture where components remain physically separate and distinct
Convert 15 kilometers/liter to miles/gallon
(1 m = 1.094 yds, 1 mile = 5280 ft, 1 L = 1.06 qt)
What is 35 miles/gallon