CHEM 1120 Final Exam Review – Complete Chemistry Study Guide & Practice
Test (2026)
Physical changes - ✔✔Reversible; change state
Melting, evaporation, slicing/cutting
Chemical changes - ✔✔irreversible; change identity
Explosion, tarnishing, rusting, frying an egg, lighting a match,
Matter - ✔✔mass and space (2 elements)
Pure substance - ✔✔Constant composition
1. Element
2.Compounds
Element - ✔✔cannot be physically or chemically broken down; already in pure form. Examples
- 02, Mn, Zn, Hg
Compound - ✔✔Can be chemically broken down but not physically. Examples - NaCl, H2O,
NH4, C6H12O6.
Mixture - ✔✔Variable composition; multiple elements without specific numbers.
1.Heterogeneous
2.Homogeneous
Heterogeneous - ✔✔Made up of different parts you can see; not uniform
Ex- fruit salad, olive garden salad dressing, fruit loops cereal, pizza, sand.
, Homogeneous - ✔✔Cant physically see parts; uniform
Ex- blood plasma, white vinegar, black coffee, sweet tea, lemonade
Significant Figures Rules - ✔✔1. Leading zeros are not significant - 0.0023 (2 sig. fig)
2. Trailing zeros are significant after the decimal - 0.00230 (3 s.f.)
3. Trailing zeros are not significant before the decimal place, unless a decimal point is put
immediately after the final 0 - (Ex) 100 has 3 sig fig
ex) 2300 - 2 s.f.
ex) 2300. - 4 sig fig.
Kilo - ✔✔value of base = 1000
Deci - ✔✔10
centi - ✔✔100
milli - ✔✔1000
micro - ✔✔1,000,000
Period on periodic table - ✔✔Horizontal row
Fahrenheit to Celsius formula - ✔✔F = C x (9/5) + 32
Celsius to Fahrenheit formula - ✔✔C = (F-32) x (5/9)
Test (2026)
Physical changes - ✔✔Reversible; change state
Melting, evaporation, slicing/cutting
Chemical changes - ✔✔irreversible; change identity
Explosion, tarnishing, rusting, frying an egg, lighting a match,
Matter - ✔✔mass and space (2 elements)
Pure substance - ✔✔Constant composition
1. Element
2.Compounds
Element - ✔✔cannot be physically or chemically broken down; already in pure form. Examples
- 02, Mn, Zn, Hg
Compound - ✔✔Can be chemically broken down but not physically. Examples - NaCl, H2O,
NH4, C6H12O6.
Mixture - ✔✔Variable composition; multiple elements without specific numbers.
1.Heterogeneous
2.Homogeneous
Heterogeneous - ✔✔Made up of different parts you can see; not uniform
Ex- fruit salad, olive garden salad dressing, fruit loops cereal, pizza, sand.
, Homogeneous - ✔✔Cant physically see parts; uniform
Ex- blood plasma, white vinegar, black coffee, sweet tea, lemonade
Significant Figures Rules - ✔✔1. Leading zeros are not significant - 0.0023 (2 sig. fig)
2. Trailing zeros are significant after the decimal - 0.00230 (3 s.f.)
3. Trailing zeros are not significant before the decimal place, unless a decimal point is put
immediately after the final 0 - (Ex) 100 has 3 sig fig
ex) 2300 - 2 s.f.
ex) 2300. - 4 sig fig.
Kilo - ✔✔value of base = 1000
Deci - ✔✔10
centi - ✔✔100
milli - ✔✔1000
micro - ✔✔1,000,000
Period on periodic table - ✔✔Horizontal row
Fahrenheit to Celsius formula - ✔✔F = C x (9/5) + 32
Celsius to Fahrenheit formula - ✔✔C = (F-32) x (5/9)
