STRAIGHTERLINE CHEMISTRY
EXAM 2025/2026 COMPLETE QUESTIONS
WITH CORRECT DETAILED ANSWERS
GRADED A+ || 100% GUARANTEED PASS
RECENT VERSION
1. transition metal ionic compounds - ANSWER indicate charge on metal
with Roman numerals
2. molecular compounds - ANSWER nonmetals or nonmetals + metalloids
3. diatomic molecules - ANSWER made up of two atoms
4. ion - ANSWER taking a neutral atom and adding or removing one or
more electrons
5. anion - ANSWER a negatively charged ion, when electrons are gained
6. cation - ANSWER a positively charged ion, when electrons are lost
7. ionic compound - ANSWER compound forms between a metal and a
nonmetal
,8. binary compounds - ANSWER compounds composed of two elements,
two classes of binary compounds: compounds that contain a metal and a
nonmetal, compounds that contain two nonmetals
9. binary ionic compound - ANSWER contains a cation (written first) and
an anion
10.calculating mass from moles - ANSWER 1 mol of element: 1x mass of
element(g)
11.calculating moles from mass - ANSWER mass(g)x (1mol of
element/molar mass(g))
12.percent composition of compounds - ANSWER mass of each element/
molar mass
13.calculating mass percent - ANSWER find mass of each individual
element and divide by molar mass
14.empirical formula - ANSWER simplest formula
15.molecular formula - ANSWER multiple of empirical formula
16.calculating empirical formula - ANSWER Example:
- 4.151 g Al x(1 mol Al/26.98 g Al)= 0.1539 mol Al atoms, 3.692 x(1
mol O/16 g O)= o.2308 mol O atoms
, - 0.1539 mol Al/0.1539= 1 mol Al atoms, 0.2308/0.1539= 1.5 mol O
atoms (can't round 1.5)
- Al₂O3
17.Calculating empirical formula from percent composition -
ANSWER assume 100 g, same as determining empirical formula
18.calculating molecular formula - ANSWER molecular mass/empirical
formula molar mass
19.barometer - ANSWER device that measures atmospheric pressure
20.units of pressure - ANSWER 1 atm= 760.0 mm Hg= 760.0 torr= 14.69 psi
21.SI unit of pressure is the pascal - ANSWER 1 standard atmosphere =
101,325 Pa
22.Boyle's Law - ANSWER volume and pressure have an inverse
relationship, P₁V₁=P₂V₂
23.Charles ' law - ANSWER volume increases when the temperature
increases, a direct relationship, when the number of moles and pressure are
constant
24.Avogadro's Law - ANSWER volume and number of moles have a direct
relationship when temperature and pressure are constant
, 25.Ideal gas law - ANSWER PV = nRT
26.partial pressure law - ANSWER total = P₁ + P₂
27.When there is one mol of anything - ANSWER it can't be a solid, liquid,
or gas because there needs to be multiple atoms
28.Finding empirical formula with diatomic molecules - ANSWER use its
molar mass of H NOT H₂
29.A metallic oxide is 21.23% oxygen. The metal has a 4+ charge. What is the
metal? - ANSWER find moles for oxygen and ratio of moles from oxygen
to M and cross multiply (2 mol O- 1 mol M), subtract 21.23 from 100 g and
use g/mol to find molar mass and element, use grams of O, not O₂
30.You find a compound composed only of element "X" and hydrogen, and
know that it is 88.81% element X by mass. Each molecule has 2.00 times as
many H atoms as X atoms. What is element X? (enter the chemical symbol)
- ANSWER use ratio (2 mol H/1 mol X)=11.10 mol H/x mol x. Then use
grams/mol
31.The left side of the container is evacuated (it is a vacuum; the volume is
8.19L). The helium in the right side of the container is at 3.99 atm (the
volume of the right side of the container is 2.86L). After the valve is opened,
what is the pressure of the helium gas in the entire container? Assume
constant temperature, ideal behavior, and that the volume of the valve is too
EXAM 2025/2026 COMPLETE QUESTIONS
WITH CORRECT DETAILED ANSWERS
GRADED A+ || 100% GUARANTEED PASS
RECENT VERSION
1. transition metal ionic compounds - ANSWER indicate charge on metal
with Roman numerals
2. molecular compounds - ANSWER nonmetals or nonmetals + metalloids
3. diatomic molecules - ANSWER made up of two atoms
4. ion - ANSWER taking a neutral atom and adding or removing one or
more electrons
5. anion - ANSWER a negatively charged ion, when electrons are gained
6. cation - ANSWER a positively charged ion, when electrons are lost
7. ionic compound - ANSWER compound forms between a metal and a
nonmetal
,8. binary compounds - ANSWER compounds composed of two elements,
two classes of binary compounds: compounds that contain a metal and a
nonmetal, compounds that contain two nonmetals
9. binary ionic compound - ANSWER contains a cation (written first) and
an anion
10.calculating mass from moles - ANSWER 1 mol of element: 1x mass of
element(g)
11.calculating moles from mass - ANSWER mass(g)x (1mol of
element/molar mass(g))
12.percent composition of compounds - ANSWER mass of each element/
molar mass
13.calculating mass percent - ANSWER find mass of each individual
element and divide by molar mass
14.empirical formula - ANSWER simplest formula
15.molecular formula - ANSWER multiple of empirical formula
16.calculating empirical formula - ANSWER Example:
- 4.151 g Al x(1 mol Al/26.98 g Al)= 0.1539 mol Al atoms, 3.692 x(1
mol O/16 g O)= o.2308 mol O atoms
, - 0.1539 mol Al/0.1539= 1 mol Al atoms, 0.2308/0.1539= 1.5 mol O
atoms (can't round 1.5)
- Al₂O3
17.Calculating empirical formula from percent composition -
ANSWER assume 100 g, same as determining empirical formula
18.calculating molecular formula - ANSWER molecular mass/empirical
formula molar mass
19.barometer - ANSWER device that measures atmospheric pressure
20.units of pressure - ANSWER 1 atm= 760.0 mm Hg= 760.0 torr= 14.69 psi
21.SI unit of pressure is the pascal - ANSWER 1 standard atmosphere =
101,325 Pa
22.Boyle's Law - ANSWER volume and pressure have an inverse
relationship, P₁V₁=P₂V₂
23.Charles ' law - ANSWER volume increases when the temperature
increases, a direct relationship, when the number of moles and pressure are
constant
24.Avogadro's Law - ANSWER volume and number of moles have a direct
relationship when temperature and pressure are constant
, 25.Ideal gas law - ANSWER PV = nRT
26.partial pressure law - ANSWER total = P₁ + P₂
27.When there is one mol of anything - ANSWER it can't be a solid, liquid,
or gas because there needs to be multiple atoms
28.Finding empirical formula with diatomic molecules - ANSWER use its
molar mass of H NOT H₂
29.A metallic oxide is 21.23% oxygen. The metal has a 4+ charge. What is the
metal? - ANSWER find moles for oxygen and ratio of moles from oxygen
to M and cross multiply (2 mol O- 1 mol M), subtract 21.23 from 100 g and
use g/mol to find molar mass and element, use grams of O, not O₂
30.You find a compound composed only of element "X" and hydrogen, and
know that it is 88.81% element X by mass. Each molecule has 2.00 times as
many H atoms as X atoms. What is element X? (enter the chemical symbol)
- ANSWER use ratio (2 mol H/1 mol X)=11.10 mol H/x mol x. Then use
grams/mol
31.The left side of the container is evacuated (it is a vacuum; the volume is
8.19L). The helium in the right side of the container is at 3.99 atm (the
volume of the right side of the container is 2.86L). After the valve is opened,
what is the pressure of the helium gas in the entire container? Assume
constant temperature, ideal behavior, and that the volume of the valve is too
