---
title: "Separating Mixtures"
description: "Use knowledge of solids, liquids, and gases to decide how mixtures might be separated through filtering, sieving, and evaporating"
canonical: https://lightmysky.com/learn/science/separating-mixtures-mt_2b6CB0w3Yx
source: https://lightmysky.com/learn/science/separating-mixtures-mt_2b6CB0w3Yx.md
retrieved: 2026-10-19
---

> **Agent view.** This is the Markdown twin of the page, for tools and assistants.
> When to use this site, and the call that answers each job: https://lightmysky.com/agent-instructions.md
> API description (OpenAPI 3.1): https://lightmysky.com/openapi.json · Authentication: https://lightmysky.com/auth.md
> Pricing: https://lightmysky.com/pricing.md · Catalog: https://lightmysky.com/llms.txt · Full catalog: https://lightmysky.com/llms-full.txt
> Every machine-readable file on this domain: https://lightmysky.com/.well-known/ai-catalog.json
> Ask for Markdown with `Accept: text/markdown`, a `.md` address, or `?mode=agent`.

# Separating Mixtures

Use knowledge of solids, liquids, and gases to decide how mixtures might be separated through filtering, sieving, and evaporating

Subject: Science · Area: Matter & Materials · Ages 9 to 10
Page: https://lightmysky.com/learn/science/separating-mixtures-mt_2b6CB0w3Yx

## Ready when they can

- Choose the correct separation method for a given mixture (sieving for large particles, filtering for small, evaporating for dissolved)
- Describe a multi-step separation plan for a complex mixture like sand, salt, and water
- Explain why each method works based on the properties of the materials

## Lesson: Separating Mixtures

A mixture is two or more materials mixed together, not joined into something new. To separate one, look closely at what's inside. Big solid pieces need a different method than a dissolved solid you can't even see. Three tools help: a sieve, a filter, and evaporation.

*(drawing: Sieve catches the biggest bits, filter catches the smaller ones, and evaporation leaves the dissolved salt behind.)*

**Example.** Mia has a mixture of sand, salt, and water. First she pours it through a sieve to catch the biggest sand grains. Next she pours what's left through a filter paper, which traps the finer sand and lets salty water drip through. Last, she heats the salty water until the water turns to gas and floats away, leaving salt crystals in the pan.

**Tip.** Ask yourself: can I see and touch the solid pieces? Then sieve or filter. Has the solid disappeared into the liquid? Then evaporate. Matching the method to the material's size and whether it dissolved is the key.

**Recap.** Sieve for big solid pieces, filter for small solid pieces in a liquid, evaporate for a dissolved solid.

## Practice

8 questions on this page, each with its working shown.

## Needs first

- [Changes & Separation Vocabulary](https://lightmysky.com/learn/science/changes-and-separation-vocabulary-mt_ahSqW_kK1b)
- [Dissolving & Solutions](https://lightmysky.com/learn/science/dissolving-and-solutions-mt_Mf-T-fYRLX)
- [Solids, Liquids & Gases](https://lightmysky.com/learn/science/solids-liquids-and-gases-mt_YQkUdIHO8L)

## Opens up

- [Choosing How to Separate Mixtures](https://lightmysky.com/learn/science/choosing-how-to-separate-mixtures-mt_U_tJvy3cbB)