Educational worksheet on mixtures and solutions for science learning.

Explanation:
Let’s go step by step through the worksheet.

1. Homogeneous means — A homogeneous mixture is one where the parts are evenly mixed and you cannot see the individual components. So:
→ *Homogeneous means* the same throughout (or *uniform in composition*).

2. A solute is — In a solution, the solute is the substance that gets dissolved (usually the smaller amount).
→ *A solute is* the substance that is dissolved.

3. A solvent is — The solvent is what does the dissolving (usually the larger amount).
→ *A solvent is* the substance that does the dissolving.

4. Aqueous means — When water is the solvent, we call it aqueous.
→ *Aqueous means* water-based or dissolved in water.

5. Draw and label an example of a mixture and a solution — Since we can’t draw here, we describe simple examples:
- *A mixture*: Sand and iron filings mixed together — you can still see both parts and separate them with a magnet.
- *A solution*: Salt dissolved in water — looks clear, no visible particles; salt is the solute, water is the solvent.

6. Separating gravel, salt, and diatomaceous earth:
- Gravel: large, heavy particles.
- Salt: small crystals, dissolves in water.
- Diatomaceous earth: fine, powdery, does *not* dissolve in water but may suspend or settle.

Strategy:
- First, add water. Salt will dissolve. Gravel (heavy) sinks quickly. Diatomaceous earth may stay suspended or settle slowly.
- Then, filter the mixture. Gravel stays in the filter (largest particles), diatomaceous earth may also be caught in the filter (if fine enough), and saltwater passes through as filtrate.
But better: since diatomaceous earth is very fine and doesn’t dissolve, and gravel is coarse, we can:
- First: Let the mixture sit — gravel settles fast (bottom), diatomaceous earth may form a cloudy layer above, salt dissolves completely.
- Then: Carefully pour off the liquid (decant) — this contains dissolved salt + possibly some diatomaceous earth suspended.
- Better method: Use filtration first — gravel and diatomaceous earth are both insoluble, so they’ll be left on the filter paper, while saltwater goes through.
But diatomaceous earth is very fine — it might pass through regular filter paper. So ideal steps:
✔ First: Add water and stir. Salt dissolves. Gravel sinks immediately. Diatomaceous earth forms a suspension.
✔ Then: Pour the mixture through a coffee filter or fine filter paper. Gravel is trapped (largest). Diatomaceous earth may mostly be trapped too (it’s powdery and doesn’t dissolve), leaving saltwater as the filtrate.
✔ Finally: Evaporate the water from the filtrate to get solid salt back.

So standard lab separation for this mix:
- First: Add water → salt dissolves; gravel and diatomaceous earth remain solid.
- Then: Filter → gravel and diatomaceous earth stay on filter paper (you can later separate them by adding more water and letting diatomaceous earth suspend while gravel settles, or use density/sieving).
But since the question asks for *how will you separate the mixture?* in 3 steps, and it's for school level, a practical answer is:

First, add water and stir — salt dissolves, gravel sinks, diatomaceous earth may cloud the water.
Then, filter the mixture — gravel and diatomaceous earth are left on the filter paper, saltwater passes through.
Finally, evaporate the water from the filtrate to recover the salt; then dry and separate gravel (coarse) from diatomaceous earth (fine powder) by hand or using a sieve.

However, many curricula accept this simpler version:
- First: Add water → salt dissolves.
- Then: Filter → gravel and diatomaceous earth are caught (as solids), saltwater goes through.
- Finally: Evaporate the liquid to get salt; the solid residue (gravel + diatomaceous earth) can be separated by adding water again and decanting — diatomaceous earth stays suspended longer, gravel sinks fast.

For a grade-school answer, they likely expect:
- First: Add water (salt dissolves, others don’t).
- Then: Filter to separate solids (gravel & diatomaceous earth) from saltwater.
- Finally: Evaporate water to get salt; use a sieve or let settle to separate gravel (big) from diatomaceous earth (fine).

But since the worksheet has only three blank lines (“First, ___ Then, ___ Finally, ___”), we give concise, correct steps:

- First: Add water and stir — the salt dissolves, but gravel and diatomaceous earth do not.
- Then: Filter the mixture — gravel and diatomaceous earth remain on the filter paper, and saltwater passes through.
- Finally: Evaporate the saltwater to get solid salt; the leftover solids can be separated by adding water again and pouring off the cloudy liquid (diatomaceous earth suspension), leaving gravel behind.

However, to keep it simple and match typical classroom expectations:

✔ First: Add water — salt dissolves; gravel sinks; diatomaceous earth floats/suspends.
✔ Then: Decant (pour off) the liquid (contains salt + maybe some diatomaceous earth), leaving gravel behind.
✔ Finally: Filter the liquid to catch diatomaceous earth, then evaporate to get salt.

But the cleanest, most reliable 3-step method is:
1. Add water → salt dissolves.
2. Filter → gravel and diatomaceous earth are retained (as residue); saltwater is filtrate.
3. Evaporate filtrate to get salt; dry residue and separate gravel (large, gritty) from diatomaceous earth (fine, chalky) by touch or sieve.

Since the question doesn’t require ultra-precision, and it’s for a student worksheet, we’ll write clear, correct, age-appropriate answers.

Now fill in all blanks:

- Homogeneous means: the same throughout
- A solute is: the substance that is dissolved
- A solvent is: the substance that does the dissolving
- Aqueous means: dissolved in water
- Example labels:
- A mixture: *e.g., sand and pebbles*
- A solution: *e.g., salt water*
- Separation:
- First: Add water and stir — the salt dissolves, but the gravel and diatomaceous earth do not.
- Then: Filter the mixture — the gravel and diatomaceous earth stay in the filter, and the saltwater passes through.
- Finally: Evaporate the water from the filtered liquid to get salt back; the solid left in the filter can be separated by adding water again and letting the gravel sink while the diatomaceous earth stays suspended, then pour off the suspension.

But for brevity (as worksheet lines are short), use:

First: Add water — salt dissolves, gravel and diatomaceous earth remain solid.
Then: Filter — solids stay on paper, saltwater goes through.
Finally: Evaporate the liquid to get salt; dry and separate gravel (coarse) from diatomaceous earth (fine powder).

We’ll now produce the Final Answer with all blanks filled exactly as expected in a school worksheet.

Final Answer:
Homogeneous means the same throughout.
A solute is the substance that is dissolved.
A solvent is the substance that does the dissolving.
Aqueous means dissolved in water.
A mixture: *example: sand and iron filings*
A solution: *example: salt water*
First, add water and stir — salt dissolves, gravel and diatomaceous earth do not.
Then, filter the mixture — gravel and diatomaceous earth are caught in the filter, saltwater passes through.
Finally, evaporate the saltwater to recover salt; separate gravel and diatomaceous earth by adding water and decanting (gravel sinks, diatomaceous earth stays suspended).