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7-3 Ch 4 - Properties and Changes of Matter

baking soda and vinegar; sunset in a bag; elephant's toothpaste (hydrogen peroxide breaking apart) examples of chemical changes
carbohydrates compounds that organisms use to get and store energy
Chemical Change a change when one or more substances form new substances; also resulting in new properties
Chemical Property descriptions of the substance to undergo chemical changes (chemical abilities) - to test it would result in new substances
chemical reaction a specific example of a chemical change
changes in physical properties (color/odor) production of a gas or precipitate, release or absorption of heat/energy signs (evidence) of a chemical reaction
color, odor, melting point, boiling point, density examples of physical properties
endothermic a reaction that absorbs heat energy
exothermic a reaction that releases heat energy
flammability, ability to react with acids, ability to change color as an indicator examples of chemical properties
glucose what is considered the "simplest" sugar?
it makes up over 60% of our bodies, is needed to transport substances, dissolves many substances our bodies need, and is substance for most chemical reactions why is water important
melting, freezing, boiling, condensing, dissolving, cutting, ripping examples of physical changes
Physical Change a change in appearance of a substance, but it stays the same substance
Physical Property descriptions of matter that can be made without changing the identity of the matter
precipitate a solid formed from the reaction of two solutions
product substances that form during the chemical reaction
protein compounds that organisms use to build new tissues
reactant substances that react chemically
solute a substances that is dissolved IN another
solution a mixture in which the two substances are indistinguishable (one or more substances are completely dissolved in another)
solvent a substance that is dissolving another
sugars (fruits, veg) and starches (grains, potato, corn, pasta, etc.) types of carbohydrates and examples of food sources
Lugol's solution (iodine) - it changes to a purple-black color What substance will indicate the presence of starch? How?
Benedict's solution - it changes with heat to red-orange-yellow-green What substance will indicate the presence of sugar? How?
hydrogen peroxide decomposes into water and oxygen (H2O2 --> H2O + O2) What is the elephant's toothpaste reaction?
photosynthesis and baking a cake examples of reactions that ABSORB energy to occur
elephant's toothpaste and combustion examples of reactions that RELEASE energy
Created by: jenhaugen01