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the increase in volume of a material when its temperature increases
process that separates materials based on the size of their particles
ability of a solid to be hammered without shattering
tendancy of a liquid to keep from flowing. Resistance to flowing
substance that cannot be broken down into simpler substances
light given off by the element neon
what causes reaction rates to increase?
type of mixture in which the parts of the mixture are noticeably different from one another
type of mixture in which the substances are so evenly distributed that it is difficult to distinguish one substance in the mixture from another
matter that has the same composition; an element or compound
what happens to the energy of molecules as temperature rises?
their speed increases
who did what to get our current model of an atom
James Chadawick discovered neutrons and showed that electrons can nbe anywhere within a limited area.
atoms of a given element that have different numbers of neutrons and different mass numbers
time required for one half of a sample of a radioactive isotope to decay
having others critique your experiment
substance that affects the rate of a cheical reaction without being used up in the reaction
phase change in which a substance changes from a solid to a gas or vapor without changing to a liquid first
the phase change in which a substance changes from a gas or vapor to a liquid
the process that changes a substance from a liquid to a gas at temperatures below the substance's boiling point
some questions on my midterm