Unit+2+Chemistry

=Unit 2: Chemistry=

STRAND
(B) Matter and energy. (i) Matter can be classified as elements, compounds, or mixtures. Students have already had experience with mixtures in Grade 5, so Grade 6 will concentrate on developing an understanding of elements and compounds. It is important that students learn the differences between elements and compounds based on observations, description of physical properties, and chemical reactions. Elements are represented by chemical symbols, while compounds are represented by chemical formulas. Subsequent grades will learn about the differences at the molecular and atomic level. (ii) Elements are classified as metals, nonmetals, and metalloids based on their physical properties. The elements are divided into three groups on the Periodic Table. Each different substance usually has a different density, so density can be used as an identifying property. Therefore, calculating density aids classification of substances.

Knowledge and Skills
**(5) Matter and energy. The student knows the differences between elements and compounds. The student is expected to:** (A) know that an element is a pure substance represented by chemical symbols; (B) recognize that a limited number of the many known elements comprise the largest portion of solid Earth, living matter, oceans, and the atmosphere; (C) differentiate between elements and compounds on the most basic level; and (D) identify the formation of a new substance by using the evidence of a possible chemical change such as production of a gas, change in temperature, production of a precipitate, or color change. **(6) Matter and energy. The student knows matter has physical properties that can be used for classification. The student is expected to:** (A) compare metals, nonmetals, and metalloids using physical properties such as luster, conductivity, or malleability; (B) calculate density to identify an unknown substance; and (C) test the physical properties of minerals, including hardness, color, luster, and streak.

Needs: Density lab, metal/nonmetal/metalloid activity, mineral lab, teach physical property vocab (luster, conductivity, malleability, hardness, streak)



Physical and Chemical Properties and Changes
Video in P Drive: Physical Science: Elements, Compounds, and Atoms