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ACT Science 2.1 Research Summary Passage 606 Views


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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?

Language:
English Language

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...

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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