Measurement & Units
This SI unit measures amount of substance.
What is the mole?
All digits 1–9 are considered this.
What are significant?
One mole equals this number of particles.
What is 6.022×10236.022×1023?
The first step in solving any stoichiometry problem
What is balance the equation?
This method uses conversion factors to cancel units
What is dimensional analysis?
Zeros between nonzero digits are this.
What are significant?
This is calculated by adding atomic masses in a formula.
What is molar mass?
After balancing, you convert given quantities into this.
What are moles?
The SI base unit for temperature.
What is Kelvin?
These zeros at the start of a number are not significant.
What are leading zeros?
The percent composition formula includes this ratio times 100.
What is (mass of element ÷ molar mass of compound)?
These come from coefficients in a balanced equation.
What are mole ratios?
“King Henry Died Unexpectedly Drinking Chocolate Milk” helps remember these.
What are metric prefixes?
Trailing zeros are only significant when this is present.
What is a decimal point?
This type of formula shows the simplest whole-number ratio of elements.
What is empirical formula?
The final step often involves converting moles into this.
What are desired units (like grams or liters)?
Converting grams to moles requires this quantity.
What is molar mass?
The number 0.00450 has this many significant figures
What is 3?
Converting moles to grams requires multiplying by this.
What is molar mass?
“Be Cool, Read Carefully” helps remember these.
What are stoichiometry steps?