This document contains a quiz over various topics in general chemistry, atomic chemistry, and water chemistry. It includes 50 multiple choice questions testing knowledge of subatomic particles, chemical bonding, acids and bases, isotopes, and other foundational chemistry concepts. For each question, the correct answer is provided.
21. •In covalent bonds, electrons are
shared.
•In ionic bonds, one atom donates
its electrons, becoming a positive
ion. The other atom accepts the
electrons, becoming a negative ion.
The ions of opposite charges are
then attracted to one another.
21
22. Water is referred to as a
__________ molecule because
it has an unequal distribution of
electrical charge.
22
24. What is the term for water
molecules being attracted to any
other substance? Hint: This is
what happened when we
dropped water on the glass slide.
24
27. No! Lipids do not dissolve in
water because they are nonpolar.
Ionic compounds and polar
molecules dissolve best in water.
27
28. Did the paperclip float?
Explain what water properties
contributed to the results we
saw in the lab.
28
29. It did not float. It sat on top of
the water due to water’s surface
tension. Surface tension is the
result of cohesion between
water molecules. Cohesion or
sticking together of water
molecules is caused by
hydrogen bonding.
29
30. Differentiate between acids and
bases. Hint: What ions are
released in water and what are
their pH values.
30
31. •Acids form H+ when dissolved in
water which combine with H2O to
+
+
form H3O . Acids have more H3O
than OH . They have pH values
below 7.
•Bases form OH- ions when
dissolved in water. Bases have more
OH- than H3O+. They have pH values
above 7.
31
49. All 3 isotopes of carbon have 6
protons, but they differ in their
number of neutrons.
Carbon-12 (6 neutrons)
Carbon-13 (7 neutrons)
Carbon-14 (8 neutrons)
49
50. Study the pH scale below. Which drink is
more acidic, apple juice (pH of 3) or black
coffee (pH of 5) and how many more times
acidic is it?
50
51. Apple Juice is 100x more acidic
than Black Coffee
Remember: The pH scale is a
Logarithmic scale (tenfold change
per number)
Difference of 2 pH levels
10 x 10 = 100 times more acidic
51