CHEM 121 FINAL EXAM|| QUESTIONS AND ANSWERS UPDATED () (VERIFIED ANSWERS)-
PORTAGE LEARNING,,,best revised
A covalent bond is likely to be polar when...
A) the two atoms sharing electrons are of the same elements
B) carbon is one of the two atoms sharing electrons
C) the two atoms sharing electrons are equally electronegative
,CHEM 121 FINAL EXAM|| QUESTIONS AND ANSWERS UPDATED () (VERIFIED ANSWERS)-
PORTAGE LEARNING,,,best revised
D) one of the atoms sharing electrons is more electronegative than
the other atom
one of the atoms sharing electrons is more electronegative than the
other atom
What is the fundamental difference between covalent and ionic
bonding?
A) In a covalent bond, the partners share a pair of electrons; in an
ionic bond, one partner
accepts electrons from the other.
B) Covalent bonds form between atoms of the same element; ionic
bonds form between
atoms of different elements.
C) In covalent bonding, both partners end up with filled outer
electron shells; in ionic
bonding, one partner does and the other does not.
D) Covalent bonding involves only the outermost electron shell;
ionic bonding also involves
the next electron shell inside the outermost shell.
In a covalent bond, the partners share a pair of electrons; in an ionic
bond, one partner
accepts electrons from the other.
All of the statements regarding the symbol "ΔH" are correct except
A) it can be called heat of reaction.
B) it represents the difference between the energy used in breaking
bonds and the energy released in forming bonds in a chemical
reaction.
C) it can be called entropy change.
D) it can be called enthalpy change.
E) it has a negative value for an exothermic reaction.
It can be called entropy change
4PCl3(l) → P4(s) + 6Cl2(g) ΔH=304.0kcal 4)
,CHEM 121 FINAL EXAM|| QUESTIONS AND ANSWERS UPDATED () (VERIFIED ANSWERS)-
PORTAGE LEARNING,,,best revised
Based on the reaction shown, which statement is true?
A) When 1 mol PCl3 (l) reacts, 304.0 kcal are released.
B) When 1 mol P4 (s) is produced, 304.0 kcal are consumed.
C) When 123.88 g P4 (s) are produced, 304.0 kcal are released. D)
When 548.56 g PCl3 (l) react, 304.0 kcal are released.
E) When 137.14 g PCl3 (l) react, 304.0 kcal are consumed.
?
A reaction is said to be if the bonds formed during the
reaction are stronger than the bonds broken.
A) exothermic
B) spontaneous
C) exergonic
D) endergonic
E) endothermic
Exothermic
If heat is consumed during a reaction, the reaction is said to be...
A) exothermic
B) endothermic
C) exothermic
D) endergonic
E) can't tell.
endothermic
Activation energy can best be described as...
A) the difference in energy between reactants and the maximum
energy.
B) the energy level of the reactants.
C) the difference in energy between reactants and products.
D) the energy level of the products.
E) the maximum energy level of the reaction.
The difference in energy between reactants and products
, CHEM 121 FINAL EXAM|| QUESTIONS AND ANSWERS UPDATED () (VERIFIED ANSWERS)-
PORTAGE LEARNING,,,best revised
Reaction rates are determined by all of the following factors except
A) the number of collisions between molecules.
B) the spontaneity of the reaction.
C) the force of collisions between molecules.
D) the activation energy of the reaction.
E) the orientation of collisions between molecules.
the spontaneity of the reaction.
Which of the following statements can be assumed to be true about
how reactions occur?
A) Reactant particles must collide with each other.
B) Energy must be absorbed as the reaction proceeds.
C) Catalysts must be present in the reaction.
D) More than one statement can be true.
more than one statement can be true
a rapid reaction is distinguished by
A) being unaffected by catalysts.
B) having a large heat of reaction.
C) having a small value of activation energy. D) having a large value
of activation energy.
E) having a small heat of reaction.
having a small value of activation energy.
For a chemical reaction to occur, all of the following must happen
except
A) a large enough number of collisions must occur.
B) chemical bonds in the products must form. C) chemical bonds in
the reactants must break.
D) reactant particles must collide with enough energy for change to
occur. E) reactant particles must collide with the correct orientation.
reactant particles must collide with the correct orientation.
Which factors would decrease the rate of a reaction?
I. Lowering the temperature
PORTAGE LEARNING,,,best revised
A covalent bond is likely to be polar when...
A) the two atoms sharing electrons are of the same elements
B) carbon is one of the two atoms sharing electrons
C) the two atoms sharing electrons are equally electronegative
,CHEM 121 FINAL EXAM|| QUESTIONS AND ANSWERS UPDATED () (VERIFIED ANSWERS)-
PORTAGE LEARNING,,,best revised
D) one of the atoms sharing electrons is more electronegative than
the other atom
one of the atoms sharing electrons is more electronegative than the
other atom
What is the fundamental difference between covalent and ionic
bonding?
A) In a covalent bond, the partners share a pair of electrons; in an
ionic bond, one partner
accepts electrons from the other.
B) Covalent bonds form between atoms of the same element; ionic
bonds form between
atoms of different elements.
C) In covalent bonding, both partners end up with filled outer
electron shells; in ionic
bonding, one partner does and the other does not.
D) Covalent bonding involves only the outermost electron shell;
ionic bonding also involves
the next electron shell inside the outermost shell.
In a covalent bond, the partners share a pair of electrons; in an ionic
bond, one partner
accepts electrons from the other.
All of the statements regarding the symbol "ΔH" are correct except
A) it can be called heat of reaction.
B) it represents the difference between the energy used in breaking
bonds and the energy released in forming bonds in a chemical
reaction.
C) it can be called entropy change.
D) it can be called enthalpy change.
E) it has a negative value for an exothermic reaction.
It can be called entropy change
4PCl3(l) → P4(s) + 6Cl2(g) ΔH=304.0kcal 4)
,CHEM 121 FINAL EXAM|| QUESTIONS AND ANSWERS UPDATED () (VERIFIED ANSWERS)-
PORTAGE LEARNING,,,best revised
Based on the reaction shown, which statement is true?
A) When 1 mol PCl3 (l) reacts, 304.0 kcal are released.
B) When 1 mol P4 (s) is produced, 304.0 kcal are consumed.
C) When 123.88 g P4 (s) are produced, 304.0 kcal are released. D)
When 548.56 g PCl3 (l) react, 304.0 kcal are released.
E) When 137.14 g PCl3 (l) react, 304.0 kcal are consumed.
?
A reaction is said to be if the bonds formed during the
reaction are stronger than the bonds broken.
A) exothermic
B) spontaneous
C) exergonic
D) endergonic
E) endothermic
Exothermic
If heat is consumed during a reaction, the reaction is said to be...
A) exothermic
B) endothermic
C) exothermic
D) endergonic
E) can't tell.
endothermic
Activation energy can best be described as...
A) the difference in energy between reactants and the maximum
energy.
B) the energy level of the reactants.
C) the difference in energy between reactants and products.
D) the energy level of the products.
E) the maximum energy level of the reaction.
The difference in energy between reactants and products
, CHEM 121 FINAL EXAM|| QUESTIONS AND ANSWERS UPDATED () (VERIFIED ANSWERS)-
PORTAGE LEARNING,,,best revised
Reaction rates are determined by all of the following factors except
A) the number of collisions between molecules.
B) the spontaneity of the reaction.
C) the force of collisions between molecules.
D) the activation energy of the reaction.
E) the orientation of collisions between molecules.
the spontaneity of the reaction.
Which of the following statements can be assumed to be true about
how reactions occur?
A) Reactant particles must collide with each other.
B) Energy must be absorbed as the reaction proceeds.
C) Catalysts must be present in the reaction.
D) More than one statement can be true.
more than one statement can be true
a rapid reaction is distinguished by
A) being unaffected by catalysts.
B) having a large heat of reaction.
C) having a small value of activation energy. D) having a large value
of activation energy.
E) having a small heat of reaction.
having a small value of activation energy.
For a chemical reaction to occur, all of the following must happen
except
A) a large enough number of collisions must occur.
B) chemical bonds in the products must form. C) chemical bonds in
the reactants must break.
D) reactant particles must collide with enough energy for change to
occur. E) reactant particles must collide with the correct orientation.
reactant particles must collide with the correct orientation.
Which factors would decrease the rate of a reaction?
I. Lowering the temperature
