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Skills available for Colorado seventh-grade science standards

Standards are in black and IXL science skills are in dark green. Hold your mouse over the name of a skill to view a sample question. Click on the name of a skill to practice that skill.

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1 Physical Science

  • 1 Mixtures of substances can be separated based on their properties such as solubility, boiling points, magnetic properties, and densities

    • Inquiry Questions:

      • 1 What techniques can be used to separate mixtures of substances based their properties?

      • 2 Which properties are the most useful in trying to separate mixtures of substances?

      • 3 How much difference must there be among the properties of substances for the properties to be useful in separating the substances?

    • Relevance and Application:

      • 1 Materials are sorted based on their properties in a variety of applications. For example, water filtration systems rely on the solubility, density, and physical sizes of substances and recycling facilities use the properties of materials to separate substances in single-stream recycling systems.

      • 2 Mining and oil refining processes use properties to separate materials.

      • 3 The kidneys use properties to filter wastes from the blood.

    • Nature of Science:

      • 1 Ask testable questions and make a falsifiable hypothesis about using properties in perform separations, and design a method to find an answer.

      • 2 Evaluate and critique experimental procedures designed to separate mixtures.

      • 3 Share experimental data, and respectfully discuss inconsistent results.

      • 4 Describe several ways in which scientists would study mixtures, and suggest ways that this has contributed to our understanding of materials.

2 Life Science

3 Earth Systems Science