Biology 1202 Midterm Questions and Answers A+ Graded (2025).

Biology 1202 Midterm Questions and
Answers A+ Graded (2025)




What .is .matter .and .what .is .it .composed .of? .- .CORRECT .ANSWER-Any
.substance .that .has .mass .and .occupies .space. .CHON
Carbon .(18%)
Hydrogen(9.5%)
Oxygen .(65%)
Nitrogen(3.3%)

What .is .an .element? .- .CORRECT .ANSWER-pure .substance .that .consists
.entirely .of .one .type .of .atom


What .is .an .atomic .number? .- .CORRECT .ANSWER-the .number .of .protons .in .an
.atom


What .is .atomic .mass? .- .CORRECT .ANSWER-the .number .of .protons .plus .the
.number .of .neutrons


What .are .electrons? .- .CORRECT .ANSWER-Negatively .charged .particles, .revolve
.around .the .nucleus. .They .travel .with .opposite .spin .(up .vs .down)


Are .filled .orbitals .stable? .- .CORRECT .ANSWER-Yes .they .are, .unlike .partially
.filled .orbitals .that .are .less .stable.


What .are .valence .electrons? .- .CORRECT .ANSWER-electrons .in .the .outermost
.energy .level


What .are .isotopes? .- .CORRECT .ANSWER-Atoms .of .the .same .element .with
.different .numbers .of .neutrons


How .is .the .periodic .table .arranged? .- .CORRECT .ANSWER-Grouping .atoms
.based .on .valence .electrons


What .are .inert .atoms? .- .CORRECT .ANSWER-Have .outer .valence .level .filled
.(noble .gases)


What .are .reactive .atoms? .- .CORRECT .ANSWER-Do .not .have .outer .level .filled
.and .want .to .make .a .octet .to .achieve .the .most .stable .state.

, What .is .electronegativity? .- .CORRECT .ANSWER-a .measure .of .the .tendency .of
.an .atom .to .attract .a .bonding .pair .of .electrons


What .makes .an .atom .more .electronegative? .- .CORRECT .ANSWER-More
.protons .in .the .nucleus, .greater .the .positive .field .the .more .drawn .electrons .are.


What .is .an .ionic .bond? .- .CORRECT .ANSWER-A .chemical .bond .that's .formed
.when .an .atom .transfers .and .electron .to .another .Atom


What .is .a .covalent .bond? .- .CORRECT .ANSWER-A .chemical .bond .formed .when
.two .or .atoms .share .electrons. .(create .an .octet)


What .is .an .nonpolar .covalent .bond? .- .CORRECT .ANSWER-Sharing .of .valence
.electrons .between .atoms .means .that .the .orbitals .of .each .atom .will .overlap,
.atoms .have .equal .electronegativity .and .are .hydrophobic.


What .is .an .Polar .Covalent .Bond? .- .CORRECT .ANSWER-Sharing .of .valence
.electrons .between .atoms .means .that .the .orbitals .of .each .atom .will .overlap,
.atoms .have .unequal .electronegativity .and .are .hydrophillic.


What .are .hydrogen .bonds? .- .CORRECT .ANSWER-a .weak .bond .between .two
.molecules .resulting .from .an .electrostatic .attraction .between .a .proton .in .one
.molecule .and .an .electronegative .atom .in .the .other.


What .are .Van .der .Waals .forces? .- .CORRECT .ANSWER-a .slight .attraction .that
.develops .between .the .oppositely .charged .regions .of .nearby .molecules,
.develop .between .nonpolar .molecules.


How .is .water .structured? .- .CORRECT .ANSWER-Consists .of .an .oxygen .atoms
.bound .to .2 .hydrogen .atoms .via .a .polar .covalent .bond .to .form .a .stable
.molecule .with .no .electrical .charge


How .are .lattice .bonds .like .in .water .when .it .is .liquid? .- .CORRECT .ANSWER-
Transient .and .continually .breaking .and .reforming. .Makes .it .miscible .as
.molecules .can .slide .past .one .another


How .are .lattice .bonds .like .in .water .when .it .is .solid? .- .CORRECT .ANSWER-
Rigid, .spaces .the .molecules .furter .part .in .a .crystalline .structure; .the .pockets .of
.air .get .trapped .in .between .making .ice .less .dense .then .liquid .water


What .is .adhesion? .- .CORRECT .ANSWER-The .attraction .of .water .to .other
.substances


What .is .cohension? .- .CORRECT .ANSWER-The .attraction .of .water .to .other .water
.molecules .as .they ."stick" .together


What .is .surface .tension .and .how .does .it .work? .- .CORRECT .ANSWER-Tendency
.of .liquid .surfaces .at .rest .to .shrink .into .the .minimum .surface .area .possible.