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ACT Science: Research Summary Passage Drill 2, Problem 3. Why is the salt left behind in the distillation chamber after boiling?
ACT Science: Research Summary Passage Drill 2, Problem 2. Why is the filter paper effective at removing sand from the water?
ACT Science: Research Summary Passage Drill 2, Problem 5. What do you think the student did wrong?
ACT Science 2.1 Research Summary Passage 608 Views
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Description:
ACT Science: Research Summary Passage Drill 2, Problem 1. Why do you think that the filter paper will not remove the salt from the water?
Transcript
- 00:03
Here's your shmoop du jour:
- 00:06
Here's a passage for you to hit pause and review.
- 00:08
Sorry we didn't have time to wrap it.
- 00:18
Why do you think that the filter paper will not remove the salt from the water?
- 00:23
Here are the potential answers...
Full Transcript
- 00:28
What's this question asking?
- 00:29
Well, there are three key components... filter paper, salt, and water.
- 00:35
The thing about the ACT tests is that the answer to every question is hidden somewhere inside.
- 00:40
You don't have to commit any massive textbooks to memory
- 00:43
before sitting down with your number 2... pencil.
- 00:46
Okay... so it's NOT so hidden in this case.
- 00:49
Take a look at the third sentence of the passage:
- 00:52
This step will remove any components of a mixture
- 00:55
that are not dissolved in the aqueous mixture...
- 00:59
'This step' refers to passing a mixture through a filter.
- 01:02
What is this question asking again?
- 01:04
Could it be asking...why the filter paper will not remove salt from water?
- 01:09
Maybe it's because 'the salt, but not the sand, was dissolved in the water'.
- 01:14
Yeah, straight from the information they gave us.
- 01:16
And combining the information from the two sentences...
- 01:19
...we get that the salt is dissolved in the water...and that the step will remove any
- 01:23
components of a mixture that are NOT dissolved.
- 01:26
Since salt is dissolved, it cannot be removed. Looks like option B's our answer.
- 01:31
And, if we want to be absolutely positive that we've got the right one... we can prove
- 01:35
that the other options are all incorrect:
- 01:38
We're using filter paper here, not a blowtorch, so the water won't be boiling away.
- 01:42
C is definitely out.
- 01:44
Distillation comes after the paper filter.
- 01:47
Time travel has yet to be invented, so we can toss out (A).
- 01:50
Now for (D). If the salt crystals were too large to fit on the paper, they'd separate
- 01:55
out of the water too, along with the sand.
- 01:57
But no, sand and salt are different, so we still need to distill the water.
- 02:01
D isn't right either.
- 02:02
Yep, definitely B.
- 02:04
Well done. This problem was no day at the beach.
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