CHEM 103 STUDY EXAMS UPDATED QUESTIONS
AND ANSWERS SURE A+
Conversions - ✔✔Converting Fahrenheit to Celsius.
oC = 5/9(oF - 32)
Converting Celsius to Fahrenheit.
oF = 9/5(oC) + 32
Converting Kelvin to Celsius.
oC = K - 273.15
Converting Celsius to Kelvin
K = oC + 273.15
✔✔Structural formula - ✔✔lines represent connections between atoms
✔✔Ball and stick model - ✔✔Each element is represented by a different colored ball
✔✔Space filling model - ✔✔Space-filling model shows the relative sizes of H and O
atoms in a water molecule
✔✔Relative masses - ✔✔-The extremely small size of atoms and molecules makes it
inconvenient to use their actual masses for measurements or calculations.
Relative masses are used instead.
-Relative masses are comparisons of actual masses to each other. For example if an
object had twice the mass of another object, their relative masses would be 2 to 1.
✔✔Atomic mass unit - ✔✔used to express relative masses of atoms
12
6C
relative mass of 12 u
AND ANSWERS SURE A+
Conversions - ✔✔Converting Fahrenheit to Celsius.
oC = 5/9(oF - 32)
Converting Celsius to Fahrenheit.
oF = 9/5(oC) + 32
Converting Kelvin to Celsius.
oC = K - 273.15
Converting Celsius to Kelvin
K = oC + 273.15
✔✔Structural formula - ✔✔lines represent connections between atoms
✔✔Ball and stick model - ✔✔Each element is represented by a different colored ball
✔✔Space filling model - ✔✔Space-filling model shows the relative sizes of H and O
atoms in a water molecule
✔✔Relative masses - ✔✔-The extremely small size of atoms and molecules makes it
inconvenient to use their actual masses for measurements or calculations.
Relative masses are used instead.
-Relative masses are comparisons of actual masses to each other. For example if an
object had twice the mass of another object, their relative masses would be 2 to 1.
✔✔Atomic mass unit - ✔✔used to express relative masses of atoms
12
6C
relative mass of 12 u
