Students learn the difference between pure substances and mixtures, classify substances as elements, compounds or mixtures, interpret particle diagrams, tell homogeneous from heterogeneous mixtures, and use melting and boiling point data to decide whether a sample is pure.
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Curriculum: Texas grade levels (TEKS). We show specific outcome codes only where they have been verified against the official curriculum document.
Completed: Pure Substances and Mixtures: Elements, Compounds and Mixtures
7th Grade students (typically ages 12–13) working on mixtures & chemical reactions. It is pitched at level 2 · standard.
Yes. The PDF includes a full answer sheet with model answers and success criteria where there is more than one good answer. You can also view the answers online.
About 40 minutes for 15 questions. Short, regular sessions work best: two or three a week beats one long one.
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Try Solutions, Solubility and Dissolving.
Success TutoringWorksheets7th Grade · Science · Mixtures & Chemical ReactionsName
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Ask: how many kinds of particle are there, and are different atoms chemically joined?
Circle the correct word for each substance.
A pure substance contains only one type of particle. There are two kinds of pure substances. An element is made of only one kind of atom, such as oxygen, iron or gold. A compound is made of two or more different kinds of atoms chemically bonded in a fixed ratio, such as water (H₂O) or carbon dioxide (CO₂).
A mixture contains two or more substances that are not chemically joined. The amounts can vary, and the parts can be separated by physical methods such as filtering or evaporating.
Use the descriptions of the particle boxes.
Particle boxes (each circle is one atom; joined circles are bonded together)
Box 1: every particle is a single black circle; all particles are the same.
Box 2: every particle is one black circle joined to two white circles; all particles are the same.
Box 3: some particles are single black circles and some are pairs of joined white circles, mixed together.
Box 4: every particle is a pair of joined white circles; all particles are the same.
In a homogeneous mixture the substances are spread evenly, so it looks the same throughout (solutions such as salt water, and air). In a heterogeneous mixture you can see the different parts (sand in water, a salad).
Scientists test purity using melting and boiling points. A pure substance melts and boils at fixed temperatures. Impurities change these temperatures and make the change happen over a range.
Preview — the PDF contains the full resource and answer sheet.
Students learn what makes a mixture different from a pure substance and how to choose a separation method from the properties of its…
Students learn the vocabulary of solutions (solute, solvent, soluble, insoluble, saturated, concentrated and dilute), explain dissolving…
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