"Concept Questions for Chemistry Using PhET" by Trish Loeblein
"Clicker Questions pH Scale"
1.
False. The color of the actual solution does not
determine if it is an acid, base, or neutral. The color that the litmus paper (a
tool to measure acidity, basicity, or neutrality) turns determines if it is
acidic or basic. If the litmus turns blue, the solution is basic; if the litmus
turns red, the solution is acidic.
2.
D (More than one). Basic solutions have a pH
greater than 7 on the pH scale. Both B and C have a pH higher than 7, indicating
that they are basic.
3.
C. Solution C has a high concentration of H3O+
which indicates that the solution is acidic.
4.
B. Solution B has a high concentration of OH-,
which indicates basicity. Solution A is neutral which equal parts of H3O+ and
OH-, and Solution C is acidic because it has higher levels of H3O+.
5.
D. (More than one) Both A and B have high enough
levels to be acidic. Since 10^16 is neutral and both of these solutions have
H3O+ concentrations higher than this which makes them acidic.
6.
A. Adding water increases the pH because the
water has a pH of 7 and the solution has a pH of 5. Adding more water lessens
the acidity and makes the pH increase. The water deludes the acidity to make it
more neutral.
7.
B. Adding an equal amount of water will dilute
the base, causing the pH to decrease. The pH of the solution (pH=10) is higher
than the pH of the water (pH=7), so the pH decreases when you add an equal
amount of water to bring the pH of the solution to about 9.7.
8.
A. (A,B,C)
This is the order from most acidic to most basic because A has the
lowest pH at 6.50, B has the middle pH at 7.40, and C has the highest pH at
12.06.
9.
E. (C,A,B) This is the order from most acidic to
most basic because C has the lowest pH and is the most acidic, A has the middle
pH and is neutral, and B has the highest pH and is the most basic.
10.
A. Since the pH is over 7, we know that
something has been added to make the equilibrium shift left. The pH is
inversely related to H3O+, and if something reacted with it, then the pH goes
up.
I like the layout that you used for this activity. I find it interesting that weak acids have higher pH levels but lower ion values. I really enjoy learning about the pH scale and would find it interesting to learn more! Is this something you enjoyed learning about as well?
ReplyDeleteHaley, great job organizing this post! I really like how you laid everything out and made it so easy to follow along with. I also really like how you gave reasons for why you chose the answers you did for each question. It was also really interesting to compare your responses with my own. It seems like our thought processes were very similar and our data was very similar.
ReplyDeleteNice job on explaining your answers! They were supportive and informative, which is perfect for activities like this. Your blog post is easy to understand and to look at. I liked that you highlighted your answers on the worksheet, they really stuck out that way!
ReplyDeleteYou have some really great answers! They are very in depth and really show that you understood the material. The post is very easy to follow along to and read- I can tell you worked hard on this activity!
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