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Science pg55
| Question | Answer |
|---|---|
| Chemical Reaction | a process that involves rearrangement of the molecular or ionic structure of a substance, as opposed to a change in physical form or a nuclear reaction. |
| Reactant | a substance that takes part in and undergoes change during a reaction. |
| Product | a substance that is formed when two or more chemicals react. |
| Activation Energy | the minimum energy which must be available to a chemical system with potential reactants to result in a chemical reaction. |
| Catalyst | a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change. |
| Enzyme | biological molecules (proteins) that act as catalysts and help complex reactions occur everywhere in life. |
| Substrate | a substance or layer that underlies something, or on which some process occurs, in particular. |
| Atom | the basic unit of a chemical element |
| Nucleus | the positively charged central core of an atom, consisting of protons and neutrons and containing nearly all its mass. |
| Electron | a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids. |
| Element | each of more than one hundred substances that cannot be chemically interconverted or broken down into simpler substances and are primary constituents of matter. |
| Isotope | each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei. |
| Compound | a thing that is composed of two or more separate elements; a mixture. |
| Ionic Bond | the complete transfer of valence electron(s) between atoms |
| Ion | an atom or a molecule in which the total number of electrons is not equal to the total number of protons. |
| Covalent Bond | a chemical bond that involves the sharing of electron pairs between atoms |
| Molecule | a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction. |
| Van Der Waals forces | weak, short-range electrostatic attractive forces between uncharged molecules, arising from the interaction of permanent or transient electric dipole moments. |
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jmccarth
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