Matter and energy. The student understands that matter can be classified according to its properties and matter is conserved in chemical changes that occur within closed systems.


The student is expected to use the periodic table to identify the atoms involved in chemical reactions. 

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The basic unit of a chemical element, consisting of a nucleus composed of protons and neutrons, surrounded by a cloud of negatively charged electrons.

Chemical Reaction

A process that results in the transformation of one or more substances into different substances that involves the breaking of existing bonds between atoms, the formation of new bonds, or both.

Periodic Table

A rows and columns arrangement of the chemical elements, organized according to their atomic number, electron configurations, and chemical properties.

Vertical TEKS Alignment 

Matter and Energy - Physical & Chemical Changes

2.6.B conduct a descriptive investigation to explain how physical properties can be changed through processes such as cutting, folding, sanding, melting, or freezing;

3.6.C predict, observe, and record changes in the state of matter caused by heating or cooling in a variety of substances such as ice becoming liquid water, condensation forming on the outside of a glass, or liquid water being heated to the point of becoming water vapor (gas);

6.6.C identify elements on the periodic table as metals, nonmetals, metalloids, and rare Earth elements based on their physical properties and importance to modern life

6.6.E identify the formation of a new substance by using the evidence of a possible chemical change, including production of a gas, change in thermal energy, production of a precipitate, and color change.

7.6.A compare and contrast elements and compounds in terms of atoms and molecules, chemical symbols, and chemical formulas*

7.6.B use the periodic table to identify the atoms and the number of each kind within a chemical formula

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