chem topic 1
Terms
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- exothermic
- Releasing heat: an exothermic reaction
- family
- a vertical column of the periodic table
- proton
- A stable, positively charged subatomic particle in the baryon family having a mass 1,836 times that of the electron.
- noble gases
- a Group 18 element (helium, neon, argon, krypton, xenon, and radon)
- series
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..
- colloid
- a mixture consisting of particles that are intermediate in size between those in solutions and suspensions forming mixtures known as colloid dispersions
- electron
- A stable subatomic particle in the lepton family having a rest mass of 9.1066 × 10-28 grams and a unit negative electric charge of approximately 1.602 × 10-19 coulombs.
- mass number
- the total number of protons and neutrons in the nucleus of an isotope
- nucleus
- The positively charged central region of an atom, composed of protons and neutrons and containing almost all of the mass of the atom
- reactant
- a substance that reacts in a chemical change
- equation
- ..
- element
- a pure substance made of only one kind of atom
- nuclear change
- ..
- solvent
- the dissolving medium in a solution
- chemical property
- the ablility of a substance to undergo a change that transforms it into a different substance
- neutron
- An electrically neutral subatomic particle in the baryon family, having a mass 1,839 times that of the electron, stable when bound in an atomic nucleus, and having a mean lifetime of approximately 1.0 × 103 seconds as a free particle. It and the proton form nearly the entire mass of atomic nuclei.
- product
- a substance that is fomred by a chemical change
- endothermic
- Characterized by or causing the absorption of heat; endoergic
- metal
- an element that is a good conductor of heat and electricity
- subscript
- A distinguishing character or symbol written directly beneath or next to and slightly below a letter or number
- compound
- a substance that is made from the atoms of two or more elements that are chemically bonded
- homogeneous
- having a uniform composisiton throughout
- atom
- the smallest unit of an element that maintains the properties of that element
- ion
- an atom or group of bonded atoms that has a positive or negative charge
- solution
- a homogeneous mixture of two or more substances in a single phase
- metalloid
- an element that has some characteristics of metals and some characteristics of nonmetals
- atomic number
- the number of protons in the nucleus of each atom of an element
- suspension
- a mixture in which the particiles in the solvent are so large that they settle out unless the mixture is constantly stirred or agitated
- chemical change
- a change in which one or more substances are converted into different substnaces
- nonmetal
- an element thta is a poor conductor of heat and electricity
- physical change
- a change in a substance that does not invilve a change in the identity of the substance
- coefficient
- a small whole number that appears in front of a formula in a chemical equation
- matter
- anything that has mass and takes up space
- heterogeneous
- not having a uniform composition throughout
- physical property
- a characteristic thta can bge observed or measured without changing the identity of the substance
- solute
- the substance dissolved in a solution