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27.3: C

Difficulty Level: At Grade Created by: CK-12
Biochemical compound such as sugar, starch, or cellulose that contains oxygen in addition to carbon and hydrogen.
Substance that increases the rate of a chemical reaction but is not changed or used up in the reaction.
cellular respiration
Process in which the cells of living things break down glucose with oxygen to produce carbon dioxide, water, and energy.
Charles’s law
Gas law stating that, if the pressure of a gas is held constant, increasing its temperature increases its volume.
chemical bond
Force of attraction between atoms or ions that occurs when atoms share or transfer valence electrons.
chemical change
Change in matter that occurs when matter changes chemically into an entirely different substance with different chemical properties.
chemical energy
Energy that is stored in the bonds between atoms that make up compounds.
chemical equation
Symbolic representation of a chemical reaction.
chemical formula
Symbol of a chemical compound using element symbols and subscripts that shows the ratio of atoms in the compound.
chemical property
Property of matter that can be measured or observed only when matter changes to a different substance.
chemical reaction
Process in which some substances, called reactants, change chemically into different substances, called products.
Study of the structure, properties, and interactions of matter, usually at a small scale such as atoms and molecules.
Homogeneous mixture in which the particles are large enough to reflect light but too small to settle or filter out of the mixture.
combustion engine
Chemical reaction in which a substance reacts quickly with oxygen, producing carbon dioxide, water, and energy; commonly called burning.
combustion reaction
Chemical reaction in which a substance reacts quickly with oxygen, producing carbon dioxide, water, and energy; commonly called burning.
Unique substance that forms when two or more elements combine chemically.
compound machine
Machine that consists of more than one simple machine.
Curving inward like the inside of a bowl.
Number of particles of a substance in a given volume.
Process in which a gas changes to a liquid.
Transfer of thermal energy between particles of matter that are touching.
Saving resources by using them more efficiently or not using them at all.
Variable in an experiment that is held constant so it will not influence the outcome.
Transfer of thermal energy by particles moving through a fluid.
convection current
Flow of particles in a fluid that occurs because of differences in temperature and density.
Curving outward like the outside of a bowl.
covalent bond
Force of attraction that holds together two atoms that share a pair of electrons.
covalent compound
Compound forms when atoms of nonmetals form molecules that are held together by covalent bonds.
Rigid, lattice-like framework of many atoms bonded together that is formed by some compounds such as table salt (NaCl).

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