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to support 7th grade TEKS

physical change

when a substance changes its size, shape, or state. No new substance is formed

chemical change

occurs when a new substance is formed as the result of a chemical reaction


a type of solid that is formed from a solution


the process by which the body breaks down food into small nutrient molecules

digestive system

collection of organs used to break down foods into energy and building material for the body

mechanical digestion

Part of digestion that uses movement and muscles to break down food

chemical digestion

occurs when enzymes and other chemicals break down large food molecules into smaller ones


part of the body where both chemical and mechanical digestion begins


liquid secreted into the mouth that contains mucus and digestive enzymes that start chemical digestion


units of two or more atoms held together by chemical bonds; the smallest unit of a compound


organic molecules composed of two or more simple sugars linked together


tube in which food travels from mouth to the stomach


large muscular sac that continues the mechanical and chemical digestion of food

stomach acid

solution with a pH of 1.5 to 2.0. It kills bacteria and helps digest your food

small intestine

responsible for most chemical digestion and absorption of nutrients

large intestine

the last section of the digestive system, where water is absorbed from food and the remaining material is eliminated from the body


large organic molecules made up of manysmaller amino acid molecules joined together


large organic molecule used for long term storage of energy for organisms; includes fats, oils, and waxes


the process by which nutrient molecules pass through the walls of the digestive system into the blood


the chemicals necessary for an organism to live and grow


has mass and takes up space

signs of a chemical change

change in color or odor; release of heat, light, or sound; produces gas or water; formation of a precipitate

accessory organs

food does not pass through these organs, but they aid in chemical digestion by creating chemicals that help to break down food molecules; pancreas & liver

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