CHEM 121 FINAL EXAM Questions and Answers | 2026 Ultimate Exam Script | A+ Verified

CHEM 121 FINAL EXAM Questions and
Answers | 2026 Ultimate Exam Script | A+
Verified
• Group 1 -✓✓Alkali metals +1

• Group 2 -✓✓Alkaline Earth Metals (+2)

• Group 17 -✓✓Halogens -1

• Group 18 -✓✓noble gases

• 1 -✓✓mono

• 2 -✓✓di

• 3 -✓✓tri

• 4 -✓✓tetra

• 5 -✓✓penta

• 6 -✓✓hexa

• 7 -✓✓hepta

• 8 -✓✓octa

• 9 -✓✓nona

• 10 -✓✓deca

• ionic compounds -✓✓metal and nonmetal

• Acetate -✓✓C2H3O2 1-

• Carbonate -✓✓CO3 2-

• Hydroxide -✓✓OH 1-

• Nitrate -✓✓NO3 1-

, • Phosphate -✓✓PO4 3-

• Sulfate -✓✓SO4 2-

• Cyanide -✓✓CN 1-

• Ammonium -✓✓NH4 1+

• Nitrite -✓✓NO2 1-

• Density -✓✓D=M/V

• Mega, M -✓✓1x10^6 (1,000,000)

• kilo, k -✓✓1x10^3 (1,000)

• centi, c -✓✓1x10^-2 (0.01)

• milli, m -✓✓1x10^-3 (0.001)

• micro, -✓✓1x10-6 (0.000001)

• nano, n -✓✓1x10^-9 (0.000000001)

• pico, p -✓✓1x10^-12 (0.000000000001)

• Conversion for mL to cm -✓✓1mL = 1cm^3

• Conversion for Kelvin from Celsius -✓✓T(K) = T(C) + 273.15

• Avogadro's Number -✓✓6.022 x 10^23

• Percent of Element -✓✓(mass of element/total mass of compound) x 100

• Determining Empirical Formulas from Data -✓✓1. convert mass to moles
2. determine pseudoformula
3. divide pseudoformula by smallest amount of moles
4. if necessary, multiply small whole numbers to get a whole-number subscripts

• Determining Molecular Formulas from Data -✓✓1. find compounds empirical formula
2. divide the compounds molar mass by molar mass of the empirical formula
3. multiply the subscripts of the empirical formula by the result