Designing Mathematics or Science Curriculum Programs: A Guide for Using Mathematics and Science Education Standards by National Research Council

Author:National Research Council
Language: eng
Format: epub
Tags: Education : Math and Science Education
Publisher: NATIONAL ACADEMY PRESS
Published: 1999-11-18T00:00:00+00:00

By the end of grade 8, students will understand that

• A substance has characteristic properties, such as density, a boiling point, and solubility, all of which are independent of the amount of the sample. A mixture of substances often can be separated into the original substances using one or more of the characteristic properties.

• Substances react chemically in characteristic ways with other substances to form new substances (compounds) with different characteristic properties. In chemical reactions, the total mass is conserved. Substances often are placed in categories or groups if they react in similar ways; metal is an example of such a group.

• Chemical elements do not break down during normal laboratory reactions involving such treatments as heating, exposure to electric current, or reaction with acids. There are more than 100 known elements that combine in a multitude of ways to produce compounds, which account for the living and non-living substances that we encounter.

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