Activity 6:
Concept Questions for
Chemistry:
1.
The color of a solution identifies if it is an
acid, base, or neutral solution.
False, the color of the solution itself does not identify if it is an
acid, base, or neutral solution, it is the color that the litmus paper turns
when you dip the litmus paper into the solution. If it turns the litmus paper
red it is an acid, and if it turns the litmus paper blue it is a base.
2.
Which solution is basic?
D, because a
basic solution must have a pH above 7 and both B and C have a pH over 7.
3.
Which solution is acidic?
C, because it has a
high level of H30+, so we know it is acidic.
4.
Which solution is basic?
B, because it has the highest amount
of OH- out of the three options. A is neutral and C has a high level of H30+,
meaning it is acidic.
5.
Which solution is acidic?
D, because both A and B have high
levels of H30+. 10^16 is neutral, and in both A and B the solution is higher
than that, meaning they are more acidic.
6.
How will adding water effect the pH?
A, because adding water causes the
acidity of a substance to decrease, meaning that it’s pH would increase since
it is becoming more basic.
7.
How will equal amount of water effect the pH?
B, because when more water is added to the solution the basicity decreases,
which means that the pH is also decreasing.
8.
What is the order from most acidic to most
basic?
A, because A’s pH is the lowest of the three, at 6.50, meaning that it is
the most acidic. Then B’s pH of 7.40 is the second highest, and C’s pH is the highest,
at 12.06, meaning it is the most basic of the three.
9.
What is the order from most acidic to most
basic?
E, because C has the lowest pH and is the most acidic, A is neutral and
has the second highest pH, and B has the highest pH and is the most basic of
the three.
10.
If spit has a pH=7.4, what does that tell you
about the water equilibrium?
A, because we know that something
had to have been added to the solution to cause it to shift left, since the pH
is not exactly 7.
Nice job with this post Mackenzie. Thanks for mentioning litmus paper. Litmus paper is a great demonstration for students to see when learning about acids and bases. I think a great way to include this into a lesson would be to have the students guess which solutions are going to turn red to indicate an acid, or which are going to turn blue to indicate a base. Then demonstrate dipping the litmus paper into the solution to reveal the answer.
ReplyDeleteI really enjoyed this activity. The worksheet would be great for older kids but the acid base questions would be easy to gear towards younger children (just not as in depth). Your answers are very nice and complete and your post is very organized.
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