CHEM 121 FINAL EXAM 2026 Updated Questions and
Answers Updated (2026/ 2027) (Verified Answers)-
PORTAGE LEARNING
express the temperature, 322.35 K, in degrees Celsius - ✅✅49.20 *C
accuracy refers to - ✅✅how close a measured number is to the true value
the nucleus of an atom contains - ✅✅protons and neutrons
the nucleus of an atom DOES NOT contain - ✅✅electrons
isotopes are atoms that have the same ---- but differing ---- - ✅✅atomic
numbers ; mass numbers
the formula of nitrobenzene is C6H5NO2. The molecular weight of this
compound is ---- amu - ✅✅123.11
which one of the following molecular formulas is also an empirical formula? -
✅✅C2H6SO
a small amount of salt dissolved in water is an example of a ---- -
✅✅homogeneous mixture
the density of a gold nugget is 19.3 g/cm^3. if the volume of the gold nugget is
0.00369 L, the mass of the nugget is ---- - ✅✅71.2
the element X has three naturally occurring isotopes. the masses (amu) and %
abundances of the isotopes are given in the table below. the average atomic
mass of the element is ---- amu - ✅✅220.4
which species has 54 electrons - ✅✅^128 52 Te ^2-
, CHEM 121 FINAL EXAM 2026 Updated Questions and
Answers Updated (2026/ 2027) (Verified Answers)-
PORTAGE LEARNING
these are all intensive properties - ✅✅density, melting point, boiling point,
temperature
the symbol for the element potassium is - ✅✅K
of the reactions below, which one is a decomposition reaction - ✅✅NH^4Cl -->
NH^3 + HCl
solid aluminum and gaseous oxygen react in a combination reaction to produce
aluminum oxide
4Al(s) + 3O2(g) --> 2Al203
The maximum amount of Al2O3 that can be produced from 2.5 g of Al and 2.5 g
of O2 is ---- g - ✅✅4.7
the si unit of temperature is ---- - ✅✅K
what is the physical state in which matter has no specific shape but does have a
specific volume? - ✅✅liquid
the correct answer (reported to the proper number of sig figs) to the following is
1.268 x 0.23= - ✅✅0.29
There are ---- electrons, ---- protons, and ---- neutrons in an atom of ^132 54 Xe
- ✅✅54;54;78
which formula/name pair is incorrect - ✅✅Fe2(SO4)3 iron (III) sulfide
how many sulfur dioxide molecules are there in 1.80 mol of sulfur dioxide -
✅✅1.08 x 10^24
, CHEM 121 FINAL EXAM 2026 Updated Questions and
Answers Updated (2026/ 2027) (Verified Answers)-
PORTAGE LEARNING
the number with the most significant zeros is - ✅✅2.51000000
lithium and nitrogen react to produce lithium nitride
6Li(s) + N2(g) --> 2Li3N(s)
How many moles of N2 are needed to react with 0.550 mol of lithium -
✅✅0.0917
which one of the following compounds is copper (I) bromide - ✅✅CuBr
when the following equation is balanced, the coefficients are ----
Al(NO3)3 + Na2S --> Al2S3 + NaNO3 - ✅✅2;3;1;6
The mass % of C in methane (CH4) is ---- - ✅✅
these are all strong bases - ✅✅LiOH; NaOH; KOH; Ca(OH)2; Sr(OH)2;
Ba(OH)2
these are all strong acids - ✅✅HClO4; HCl; HBr; HI; HNO3; H2SO4
which one of the following is insoluble in water?
Na2S ; Ca(OH)2 ; AgCl ; Fe(NO3)2 ; (NH4)2SO4 - ✅✅AgCl
what is the precipitate that forms when KI(aq) reacts with Pb(NO3)2 (aq) -
✅✅PbI2
when aqueous solutions of AgNO3 and NaI are mixed, Agl precipitates. the
balanced net ionic equation is ---- - ✅✅Ag ^+ (aq) + I ^- --> AgI (s)
which of the following is a valid set of four quantum numbers? (n, l, ml, ms) -
✅✅2; 1; 0; +1/2
Answers Updated (2026/ 2027) (Verified Answers)-
PORTAGE LEARNING
express the temperature, 322.35 K, in degrees Celsius - ✅✅49.20 *C
accuracy refers to - ✅✅how close a measured number is to the true value
the nucleus of an atom contains - ✅✅protons and neutrons
the nucleus of an atom DOES NOT contain - ✅✅electrons
isotopes are atoms that have the same ---- but differing ---- - ✅✅atomic
numbers ; mass numbers
the formula of nitrobenzene is C6H5NO2. The molecular weight of this
compound is ---- amu - ✅✅123.11
which one of the following molecular formulas is also an empirical formula? -
✅✅C2H6SO
a small amount of salt dissolved in water is an example of a ---- -
✅✅homogeneous mixture
the density of a gold nugget is 19.3 g/cm^3. if the volume of the gold nugget is
0.00369 L, the mass of the nugget is ---- - ✅✅71.2
the element X has three naturally occurring isotopes. the masses (amu) and %
abundances of the isotopes are given in the table below. the average atomic
mass of the element is ---- amu - ✅✅220.4
which species has 54 electrons - ✅✅^128 52 Te ^2-
, CHEM 121 FINAL EXAM 2026 Updated Questions and
Answers Updated (2026/ 2027) (Verified Answers)-
PORTAGE LEARNING
these are all intensive properties - ✅✅density, melting point, boiling point,
temperature
the symbol for the element potassium is - ✅✅K
of the reactions below, which one is a decomposition reaction - ✅✅NH^4Cl -->
NH^3 + HCl
solid aluminum and gaseous oxygen react in a combination reaction to produce
aluminum oxide
4Al(s) + 3O2(g) --> 2Al203
The maximum amount of Al2O3 that can be produced from 2.5 g of Al and 2.5 g
of O2 is ---- g - ✅✅4.7
the si unit of temperature is ---- - ✅✅K
what is the physical state in which matter has no specific shape but does have a
specific volume? - ✅✅liquid
the correct answer (reported to the proper number of sig figs) to the following is
1.268 x 0.23= - ✅✅0.29
There are ---- electrons, ---- protons, and ---- neutrons in an atom of ^132 54 Xe
- ✅✅54;54;78
which formula/name pair is incorrect - ✅✅Fe2(SO4)3 iron (III) sulfide
how many sulfur dioxide molecules are there in 1.80 mol of sulfur dioxide -
✅✅1.08 x 10^24
, CHEM 121 FINAL EXAM 2026 Updated Questions and
Answers Updated (2026/ 2027) (Verified Answers)-
PORTAGE LEARNING
the number with the most significant zeros is - ✅✅2.51000000
lithium and nitrogen react to produce lithium nitride
6Li(s) + N2(g) --> 2Li3N(s)
How many moles of N2 are needed to react with 0.550 mol of lithium -
✅✅0.0917
which one of the following compounds is copper (I) bromide - ✅✅CuBr
when the following equation is balanced, the coefficients are ----
Al(NO3)3 + Na2S --> Al2S3 + NaNO3 - ✅✅2;3;1;6
The mass % of C in methane (CH4) is ---- - ✅✅
these are all strong bases - ✅✅LiOH; NaOH; KOH; Ca(OH)2; Sr(OH)2;
Ba(OH)2
these are all strong acids - ✅✅HClO4; HCl; HBr; HI; HNO3; H2SO4
which one of the following is insoluble in water?
Na2S ; Ca(OH)2 ; AgCl ; Fe(NO3)2 ; (NH4)2SO4 - ✅✅AgCl
what is the precipitate that forms when KI(aq) reacts with Pb(NO3)2 (aq) -
✅✅PbI2
when aqueous solutions of AgNO3 and NaI are mixed, Agl precipitates. the
balanced net ionic equation is ---- - ✅✅Ag ^+ (aq) + I ^- --> AgI (s)
which of the following is a valid set of four quantum numbers? (n, l, ml, ms) -
✅✅2; 1; 0; +1/2
