Units of Measurement
What is the SI base unit for mass?
the gram (g)
The measure of the amount of matter in an object is
mass
Mass cannot be created nor destroyed during physical and chemical changes
Law of Conservation of Mass
The counting unit that represents amount of substance
The mole (mol)
The atom is defined as
simplest unit of all matter
What is the tool to measure length in cm?
ruler
The measure of 3-D space an object occupies is called
volume
If two compounds are made of the same two elements, the element will combine in small whole number ratios to give rise to different compounds.
Law of Multiple Proportions
grams per mole (g/mol) is the unit for
molar mass
What are the three subatomic parts that make up the atom?
protons neutrons electrons
meter (m)
The amount of mass per given volume which can be calculated as
mass / volume = ?
density
Law of Definite Proportions
What is Avogadro's number?
The amount of particles or atoms in 1 mole
6.02 x 1023 atoms
Which element has an atomic number of 79?
Gold (Au)
Which mass unit is largest?
gram (g), kilogram (kg), or milligram (mg)
kilogram (kg)
What is the density of the unknown substance if the mass is 10g and the volume is 5 mL?
D = m / V
Include units!
100 / 5 = 2 g/mL
During a chemical reaction...
the mass before is _______________ the mass after
equal to
Complete the missing parts....
___________ = 1 mole = _________ atoms
molar mass = 1 mole = 6.02 x 1023 atoms
What is the molar mass of O2
2 x 16 = 32 g/mol
What are units of volume for a liquid?
What are the units of volume for a solid?
volume of solid = m3 or cm3
What is the ratio of elements in the following compounds? What is the difference in compounds?
CO
CO2
CO 1:1
CO2 2:1
Carbon monoxide vs carbon dioxide
What is the molar mass of Carbon?
How many atoms are in this amount of carbon?
12.01 g/ mol
6.02 x 1023 atoms
Which element has the symbol Mg? What is the atomic number and the molar mass of Pb?
Magnesium
Atomic # = 12
Molar mass = 24.3 g/mol