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ACS First Year Chemistry Exam Questions
and Correct Answers/ Latest Update /
Already Graded
ionization energy
Ans: the amount of energy required to remove an electron
from an atom.
- increases from bottom left to top right
atomic radius
Ans: distance from center to edge of an atom.
- decreases from bottom left to top right
electronegativity
Ans: how much an atom "pulls" on electrons in a bond.
- increases from bottom left to top right
metallic character
Ans: how easily an atom gives up electrons to form a positive
ion.
- decreases from bottom left to top right
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reactivity
Ans: how easily an atom gains or loses electrons.
- the closer an element is to completing a full valence shell, the
more likely they are to react chemically
coulomb's law
Ans: determines how much energy is present in an ionic bond.
E = (kq1 * q2)/r
r: length of bond
E: amt of energy
k: constant
q1 & q2: charges on each ion
bond length
Ans: - the smaller the atoms, the shorter the bond length.
- the more bonds between atoms, the shorter the bond length.
- the shorter the bond length, the greater the energy.
metallic bond
Ans: metal atoms donate valence electrons to become cations;
these valence electrons more freely throughout the sample,
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producing an attractive force that keeps the metal cations in
place.
bond energy
Ans: net release in energy (ΔH) = (energy it takes to break
bonds) - (energy it takes to make new bonds)
breaking bonds: uses energy
forming bonds: releases energy
chemical equilibrium
Ans: forward & reverse reaction rates are equal; temperature &
pressure are maintained; system is closed.
aA + bB ⇌ cC + dD
***concentration of reactants and products are not necessarily
equal!!
equilibrium constant: K_eq
Ans: Keq = ([C]^c [D]^d)/([A]^a [B]^b)
- [ ] means "concentration of"
[products]/[reactants]
All rights reserved © 2025/ 2026 |
ACS First Year Chemistry Exam Questions
and Correct Answers/ Latest Update /
Already Graded
ionization energy
Ans: the amount of energy required to remove an electron
from an atom.
- increases from bottom left to top right
atomic radius
Ans: distance from center to edge of an atom.
- decreases from bottom left to top right
electronegativity
Ans: how much an atom "pulls" on electrons in a bond.
- increases from bottom left to top right
metallic character
Ans: how easily an atom gives up electrons to form a positive
ion.
- decreases from bottom left to top right
All rights reserved © 2025/ 2026 |
, Page |2
reactivity
Ans: how easily an atom gains or loses electrons.
- the closer an element is to completing a full valence shell, the
more likely they are to react chemically
coulomb's law
Ans: determines how much energy is present in an ionic bond.
E = (kq1 * q2)/r
r: length of bond
E: amt of energy
k: constant
q1 & q2: charges on each ion
bond length
Ans: - the smaller the atoms, the shorter the bond length.
- the more bonds between atoms, the shorter the bond length.
- the shorter the bond length, the greater the energy.
metallic bond
Ans: metal atoms donate valence electrons to become cations;
these valence electrons more freely throughout the sample,
All rights reserved © 2025/ 2026 |
, Page |3
producing an attractive force that keeps the metal cations in
place.
bond energy
Ans: net release in energy (ΔH) = (energy it takes to break
bonds) - (energy it takes to make new bonds)
breaking bonds: uses energy
forming bonds: releases energy
chemical equilibrium
Ans: forward & reverse reaction rates are equal; temperature &
pressure are maintained; system is closed.
aA + bB ⇌ cC + dD
***concentration of reactants and products are not necessarily
equal!!
equilibrium constant: K_eq
Ans: Keq = ([C]^c [D]^d)/([A]^a [B]^b)
- [ ] means "concentration of"
[products]/[reactants]
All rights reserved © 2025/ 2026 |
