Words To know for the exam of Chemical & Physical Changes
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Phase Changes | Phase Changes- When matter changes from one form to another ( solid, liquid, gas)
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| Freezing- | Freezing- When matter changes from liquid to solid after heat is lost at 0 degrees Celsius
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| Melting- | Melting- When matter changes from a solid to a liquid when heat is gained
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| Evaporation- | Evaporation- When matter changes from liquid to a gas after gaining heat at 100 degrees Celsius
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| Condensation- | Condensation- When matter changes form a gas to a liquid after losing heat.
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| Steam | Steam- is the gas given off when a liquid changes to a gas ( like water in you iron )
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| Five Chemical Properties | Five Chemical Properties – are properties observed when one substances is changed into another
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| Flammability | Flammability- ability of a substance to burn
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| Toxicity | Toxicity- the degree to which something is poisonous
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| pH- | pH- the acidity of a liquid substance
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| Reactivity | Reactivity - the response of one substance to another
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| Rusting | Rusting- iron reacting with oxygen
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| Burning- | Burning- when something catches on fire
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| Reversible | Reversible- the ability to return to how you
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| Compounds- | Compounds- When atoms of two or more elements combine chemically, and form a compound with different properties than the individual elements from which it is made.
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| Molecules | Molecules- the smallest unit of a compound is a molecule.
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| Chemical Reactions | Chemical Reactions- when the atoms of two or more elements combine or split up to form a substance with different properties
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| Law of Conservation of Matter- | states that matter cannot be created or destroyed. That means that the mass of any materials that have gone through a chemical change together will be the same after the experiment as it was before the experiment.
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| Six Signs of Chemical Reaction |
a. Heat
b. Light
c. Smoke/fumes
d. Fizz/Bubbles
e. New Solids
f. Smells Different
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| Atoms- | Atoms- the smallest unit of an element is an atom
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