Texas TEKS5th GradeScience

5.6C— Identifying Conservation of Matter in Solutions

Matter and energy · b.6: Matter and energy. The student knows that matter has measurable physical properties that determine how matter is identified, classified, changed, and used. The student is expected to:

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What this standard means: TEKS §112.7.6.C asks fifth graders to compare the properties of substances before and after they form a solution, and to show that the matter is still there even when it looks different. This intervention has students act as fact-checkers, using the sentence starters 'The error is...' and 'The evidence that matter is conserved is...' to correct claims like Mia's, who says her lemonade sugar disappeared. Students use mass as their proof: adding 5 grams of sugar to 100 grams of water always yields a 105-gram solution, whether or not the sugar can be seen. Each question pairs a wrong claim with a real mass calculation. With repetition, citing before-and-after mass becomes the default way students defend that matter is conserved.

What the standard says, word for word · §112.7.b.6.C

compare the properties of substances before and after they are combined into a solution and demonstrate that matter is conserved in solutions;

Read it at the source: Texas Education Agency (TEA)

What’s inside

What you get, and who it’s for

Everything below is measured from the actual lesson and the actual file. Nothing here is an estimate.

Time to run: About 25 minutes. 7 min lesson, then 18 min of practice.
In the download: 7 printable pages: the full lesson, the worked examples, the visual models, and 6 practice questions with space to work. An educator answer key is included at the end, so the student pages come first and it is still ready to hand out. The lesson’s worked examples do show their solutions, because that is how they teach.
Question set: The download carries all 6 questions. The page shows 6 of them as a sample.
Question format: Every question is short answer. Students show their work on the page.
Assumed before this: Students who are shaky on these will struggle with 5.6C. Worth a quick check first.
§112.6.b.6.C(Grade 4) Students should already be able to demonstrate that matter is conserved when mixtures such as soil and water or oil and water are formed.
Dates: Published August 6, 2026. Last updated August 14, 2026.

The sample intervention

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5.6C

Solutions Can Change Look, Not Matter

Compare substance properties before and after they are mixed into a solution, and show that the matter is still there.

Read the passages and examples below to review how matter stays the same when substances dissolve into a solution. Then, for each question, find the mistake in the student's claim and fix it. Start your answers with these sentence starters: "The error is…" and "The evidence that matter is conserved is…"

When a substance dissolves, it may seem to disappear. It does not vanish. It spreads out in the liquid, so you cannot see it easily.

Same sugar, spread out

solidBefore: sugar grains in the spoon

mixtureAfter: sugar spread through water

The same amount of sugar is in both boxes. After mixing it is spread out, so you cannot see it.

Before mixing, substances have their own properties. Sugar crystals look grainy, salt looks tiny and white, and hot chocolate mix looks powdery. Water is clear and flows easily.

After mixing, the new solution can look different. Lemonade may look cloudy or pink, and hot chocolate may turn brown. The liquid changes in appearance, but the matter is still there.

What changes and what stays the same

Dissolving changes what you SEE. It does not change how much matter is there.

A good clue is mass. If you measure the substances before mixing and then measure the solution after mixing, the total mass stays the same if nothing is lost. Matter is conserved.

The scale tells the truth

	Mass before mixing	Mass after mixing
Lemonade	10 g sugar + 150 g water = 160 g	160 g of lemonade
Salt water	6 g salt + 120 g water = 126 g	126 g of salt water
Hot chocolate	8 g mix + 180 g milk = 188 g	188 g of hot chocolate

The mass after mixing equals the mass before. Nothing was lost - you just cannot see it any more.

If a student says the sugar disappeared in lemonade because it cannot be seen, that is an error. The sugar is still in the lemonade, just spread out evenly. The evidence is the same total mass before and after mixing.

In a swimming pool, a small amount of pool cleaner can dissolve in water. The cleaner may not be visible, but it does not disappear. It becomes part of the solution and still has mass.

Worked exampleSugar: 5 grams + water: 100 grams = before mixing total: 105 grams. After mixing, lemonade still has 105 grams if nothing spills.

Worked exampleSalt: 3 grams + water: 200 grams = before mixing total: 203 grams. After mixing, the salty water still has 203 grams.

Worked exampleHot chocolate mix: 8 grams + milk: 120 grams = before mixing total: 128 grams. After mixing, the drink still has 128 grams if all of it stays in the cup.

Practice questions

1
Mia mixes 5 grams of sugar with 100 grams of water for lemonade. She says, 'The sugar disappeared because I cannot see it anymore.' What is the error in Mia's thinking, and what is the correct idea?
2
A student mixes 3 grams of salt with 200 grams of water. They write, 'The water now weighs 200 grams, so the salt must be gone.' What is wrong with this claim? Give the correct total mass after mixing.
3
A student says the lemonade has more mass because it has more liquid. Is the student correct? Compare these two cases: a lemonade pitcher with 7 grams of sugar and 93 grams of water, and a hot chocolate mug with 9 grams of mix and 91 grams of milk. Explain why the student is right or wrong.
4
A pool cleaner mix starts with 2 grams of cleaner and 50 grams of water. A student says, 'Because the cleaner cannot be seen, the total mass is only 50 grams now.' What does this situation show about matter in solutions?
5
A student says, 'Lemonade can look cloudy after mixing, so its matter changed into something new.' Why is this explanation not correct?
6
At home, 4 grams of hot chocolate mix are stirred into 96 grams of milk. The cup still has all of its drink. A student says, 'The mix is gone because I cannot see the powder.' What should you say to correct the student?

Part of the question set is shown. Generate the whole intervention, freshly themed and with an answer key, for your own class in the product.

Watch for this

Common mistakes

Visible means gone. Students often think a dissolved substance disappears when they can no longer see it, or that a changed look means new matter was made. In this skill, the key correction is that the substance is still there, spread out through the liquid, and the total mass stays the same if nothing is lost.

Vocabulary

Key terms

solution: A solution is a mixture where one substance dissolves in another liquid.
dissolve: To dissolve means to spread out in a liquid so the substance cannot be seen easily.
matter: Matter is the material that is still there even when it cannot be seen.
mass: Mass is the amount of matter in something.

In the classroom

How to use this intervention

Use the 7-minute lesson time for a quick whole-class review of the passages and sentence starters, then send students into the 18-minute worksheet as independent practice. Circulate to support a small group of students who need help spotting the error in each claim and using the mass evidence in their answers.

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Questions educators ask

Educator FAQ

What grade is this worksheet for?

This worksheet is for Grade 5.

Which TEKS standard does it align to?

It aligns to TEKS §112.7.b.6.C, comparing substance properties before and after they are mixed into a solution.

Does the worksheet include an answer key?

Yes, the free worksheet PDF includes all questions with a complete answer key.