SBI4U exam practice questions with
verified answers already passed
Condensation reaction - correct answer ✔✔occurs when two molecules join to form a larger
molecule and release a smaller molecule(s) in the process. The smaller molecule lost in the
reaction is often water, but it can also be methanol, hydrogen chloride, acetic acid or several
other molecules.
redox reactions (oxidation-reduction reactions) - correct answer ✔✔two things happen. You
guessed it -- oxidation and reduction. These two have to happen together. You cannot have an
oxidation reaction without a corresponding reduction reaction. It's a bit like the idea behind a
blood transfusion or an organ transplant. You cannot have a recipient unless you have a donor,
and it does not make any sense to be a donor unless there is a recipient.
Neutralization reaction - correct answer ✔✔Neutralization is a type of chemical reaction in
which a strong acid and strong base react with each other to form water and salt.
Hydrolysis reaction - correct answer ✔✔hydrolysis is a chemical reaction in which water is used
to break down the bonds of a particular substance
reaction type:
Glucose + fructose → sucrose + water - correct answer ✔✔condensation
reaction type:
Pyruvate + 2H+ + 2 electrons → lactate - correct answer ✔✔Redox
reaction type: HCl + NaOH → NaCl + H2O - correct answer ✔✔neutralization
, reaction type:
Fe → Fe2+ + 2 electrons - correct answer ✔✔redox
reaction type:
NaOH + HBr → H2O + NaBr - correct answer ✔✔neutralization
Many glucoses → glycogen + water - correct answer ✔✔condensation
Protein + water → many amino acids + water - correct answer ✔✔Hydrolysis
What is a covalent bond? - correct answer ✔✔When 2 atoms share their valence electrons, a
covalent bond is formed. This sharing of valence electrons enables each atom to obtain a "full
valence Shell". This type of bond exists between atoms in molecules.
Compare the process of exocytosis to the process of endocytosis - correct answer ✔✔Both are
forms of active transport that require the cellular membrane to assist in the movement of the
material. Exocytosis involves the removal of materials such as wastes from the cell.(1 mark).
Endocytosis involves bringing materials such as water (pinocytosis) and solid particles
(phagocytosis) into the cell.
Mary roasted a turkey. Before she placed the turkey in the oven, she rubbed the turkey
with a mixture of salt and sage. She cooked it by following the package's instructions exactly,
but when she tasted the turkey a few hours later, she noticed that it was dry. Since her turkey
did not overcook, what did Mary do wrong? - correct answer ✔✔The salt created a hypertonic
environment relative to the interior of the roasts turkeys' cells (hypotonic). This caused the
water to migrate out of the roast by osmosis, making it dry.
Hypertonic solution: a hypertonic solution is one where the concentration of solutes is greater
outside the cell than inside it.
verified answers already passed
Condensation reaction - correct answer ✔✔occurs when two molecules join to form a larger
molecule and release a smaller molecule(s) in the process. The smaller molecule lost in the
reaction is often water, but it can also be methanol, hydrogen chloride, acetic acid or several
other molecules.
redox reactions (oxidation-reduction reactions) - correct answer ✔✔two things happen. You
guessed it -- oxidation and reduction. These two have to happen together. You cannot have an
oxidation reaction without a corresponding reduction reaction. It's a bit like the idea behind a
blood transfusion or an organ transplant. You cannot have a recipient unless you have a donor,
and it does not make any sense to be a donor unless there is a recipient.
Neutralization reaction - correct answer ✔✔Neutralization is a type of chemical reaction in
which a strong acid and strong base react with each other to form water and salt.
Hydrolysis reaction - correct answer ✔✔hydrolysis is a chemical reaction in which water is used
to break down the bonds of a particular substance
reaction type:
Glucose + fructose → sucrose + water - correct answer ✔✔condensation
reaction type:
Pyruvate + 2H+ + 2 electrons → lactate - correct answer ✔✔Redox
reaction type: HCl + NaOH → NaCl + H2O - correct answer ✔✔neutralization
, reaction type:
Fe → Fe2+ + 2 electrons - correct answer ✔✔redox
reaction type:
NaOH + HBr → H2O + NaBr - correct answer ✔✔neutralization
Many glucoses → glycogen + water - correct answer ✔✔condensation
Protein + water → many amino acids + water - correct answer ✔✔Hydrolysis
What is a covalent bond? - correct answer ✔✔When 2 atoms share their valence electrons, a
covalent bond is formed. This sharing of valence electrons enables each atom to obtain a "full
valence Shell". This type of bond exists between atoms in molecules.
Compare the process of exocytosis to the process of endocytosis - correct answer ✔✔Both are
forms of active transport that require the cellular membrane to assist in the movement of the
material. Exocytosis involves the removal of materials such as wastes from the cell.(1 mark).
Endocytosis involves bringing materials such as water (pinocytosis) and solid particles
(phagocytosis) into the cell.
Mary roasted a turkey. Before she placed the turkey in the oven, she rubbed the turkey
with a mixture of salt and sage. She cooked it by following the package's instructions exactly,
but when she tasted the turkey a few hours later, she noticed that it was dry. Since her turkey
did not overcook, what did Mary do wrong? - correct answer ✔✔The salt created a hypertonic
environment relative to the interior of the roasts turkeys' cells (hypotonic). This caused the
water to migrate out of the roast by osmosis, making it dry.
Hypertonic solution: a hypertonic solution is one where the concentration of solutes is greater
outside the cell than inside it.
