Texas TEKS 5.6.C
The Standard
compare the properties of substances before and after they are combined into a solution and demonstrate that matter is conserved in solutions
Texas Essential Knowledge and Skills for Science
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students observe and measure substances before and after mixing them into a solution. They compare properties such as appearance, state, and mass, then use measurements to show that no matter was lost.
What Mastery Looks Like
- A student records the total mass before and after dissolving and explains why the measurements should match. The student can explain that a dissolved substance is still present even when it cannot be seen.
Common Misconceptions
- Students may think dissolved material disappears or changes into water. They may also expect volume to stay constant, confuse volume with mass, or overlook spills and evaporation during measurement.
How to Assess It
- Give students before-and-after data for salt dissolved in water. Ask them to identify what changed, what stayed the same, and where the salt went.
Lesson moves
Ways to Teach It
Put salt and water in a zip bag, weigh before mixing, dissolve the salt, then reweigh and record appearance, state, and mass.
Write a claim answering, “Did the sugar disappear when it dissolved?” and support it with mass measurements and observations.
Match solution cards showing materials and masses before mixing with the correct after-mixing mass, then explain each match to a partner.
Prepare powdered drink mix, compare the powder and finished drink, and explain why the dissolved powder remains part of the drink.
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Printable 5.6.C Worksheet
A ready-to-print activity worksheet aligned to 5.6.C, with an answer key for the teacher on its own page. No account needed.
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Related Standards
- 4.6.B
investigate and compare a variety of mixtures, including solutions that are composed of liquids in liquids and solids in liquids; and
- 5.6.B
demonstrate and explain that some mixtures maintain physical properties of their substances such as iron filings and sand or sand and water;
- 4.6.C
demonstrate that matter is conserved when mixtures such as soil and water or oil and water are formed.
- 6.6.B
investigate the physical properties of matter to distinguish between pure substances, homogeneous mixtures (solutions), and heterogeneous mixtures;
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