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 investigate how mass is conserved in chemical reactions and relate conservation of mass to the rearrangement of atoms using chemical equations, including photosynthesis.

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Conservation of Mass

A fundamental principle in physics and chemistry that states the total mass of a closed system remains constant over time, regardless of any physical or chemical changes that may occur within the system. Matter cannot be created or destroyed, only transformed from one form to another.

Chemical Reactions

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.


A biological process in which green plants, algae, and some bacteria convert light energy from the sun, carbon dioxide, and water, into chemical energy in the form of organic compounds, such as glucose, while releasing oxygen into the atmosphere.

Vertical TEKS Alignment 

Matter and Energy - Conservation of Mass; Change in Matter

3.6.C demonstrate that materials can be combined based on their physical properties to create or modify objects such as building a tower or adding clay  to sand to make a  stronger brick and justify the selection of materials based on their physical properties

4.6.C demonstrate that matter is conserved when mixtures such as soil and water or oil and water are formed

5.6.C compare the properties of substances before and after they are combined into a solution and demonstrate that matter is conserved in solutions

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