Contributed by: The RAND Institute (RAND)
Alien Text Version
Part 1 (Page 2)
Part 2 (Page 3)
| 2a |
1 pt |
9 |
| 2b |
1 pt |
B (too basic) |
Part 3 (Page 5)
| Table 1 |
8 pts |
| Score |
1 pt for each correct pH number. If rows 2-4 have no answer,
award points for correct answers in the corresponding blanks
on p.4: Question 3 corresponds to row 2, question 4 to row 3,
and question 6 to row 4. If answers are given in both places,
score the answers in the table, even if they are wrong and the
answers on page 4 are correct. |
| Answer |
Row 2 |
7 |
|
Row 3 |
1 |
|
Row 4 |
11 |
|
Row 5 |
11 |
|
Row 6 |
9 |
|
Row 7 |
9 |
|
Row 8 |
7 |
|
Row 9 |
5 |
PART 4: (Page 6)
| 4a |
1 pt- Medicine C
Note: 4a is a gateway point for 4b. Award no points for
4b if 4a is incorrect.
|
| 4b |
1 pt- C brings the blood back to normal or neutral or pH of
7 or to yellow or "evens out," "balances," or "stabilizes" the
blood.
1 pt- Mentions 1 or more of the following:
- C is acidic and the blood is too basic.
- C lowers the pH of the blood (to yellow or neutral).
- Medicine A made the blood more basic and B had no effect.
Note: Award no points for 4b if the student states that medicine
C itself is closer to neutral; the correct answer is that
C can neutralize the blood.
|
| 4c |
1 pt- By adding any one of the following or any combination
of them:
- an acid or solution with a low pH
- Solution X
- Medicine C
|
| 4d |
1 pt- By adding either of the following or a combination of
them:
- a base or solution with a high pH.
- Medicine A
|
Part 5 (Page 7)
| 5a |
1 pt - Fish stopped dying because Pro-Base made the pond less
acidic, returned the pH to neutral, or balanced the water.
1 pt- Fish began dying again because additional Pro-Base
made the pond water too basic, or the pH went past neutral
to make the pond basic.
Note: Answers which make no reference to "base" or "neutral"
or pH - e.g., "They gave it too much," or "They need to give
it less," or "It was too strong," or "They gave it the right
amount" - are not acceptable.
|
| 5b |
1 pt - B (Add an acidic substance) |
| 5c |
1 pt - The acid is needed to bring the water from a base
back to neutral pH, e.g. "It brings it back to neutral," "To
reverse the process," or "Balance the water," is also an acceptable
answer.
1 pt - But stop adding acid when the water has become neutral.
The response must provide enough information to tell how to
proceed correctly, e.g., what amount is needed to get to neutral,
or what actions would disrupt neutrality.
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