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 compare and contrast the properties of acids and bases, including pH relative to water;

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A substance that donates hydrogen ions (H+) or protons to a chemical reaction and they have a pH value less than 7 on the pH scale, which ranges from 0 to 14.


A substance that can accept or react with hydrogen ions (protons) in a chemical reaction and they have a pH value greater than 7 on the pH scale, which ranges from 0 to 14

(Also known as "alkaline".) 


The measure of how acidic or basic a substance is

Vertical TEKS Alignment 

Matter and Energy - Physical & Chemical Properties

3.6.A measure, test, and record physical properties of matter, including temperature, mass, magnetism, and the ability to sink or float in water;

3.6.B describe and classify samples of matter as solids, liquids, and gases and demonstrate that solids have a definite shape and that liquids and gases take the shape of their container;

4.6.A classify and describe matter using observable physical properties, including temperature, mass, magnetism, relative density (the ability to sink or float in water), and physical state (solid, liquid, gas);

5.6.A compare and contrast matter based on measurable, testable, or observable physical properties, including mass, magnetism, relative density (sinking and floating using water as a reference point), physical state (solid, liquid, gas), volume, solubility in water, and the ability to conduct or insulate thermal energy and electric energy;

6.6.D compare the density of substances relative to various fluids; 

6.6.A compare solids, liquids, and gases in terms of their structure, shape, volume, and kinetic energy of atoms and molecules;

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