SCI 10 1ST TERM EXAM
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24 Terms
chemical reaction
a process where one or more substances are transformed into new substances
gas production, light emission, color change, temperature change, and precipitate formation
what are the 5 indicators of chemical reactions?
acids
produces H+ ions in water and usually tastes sour
bases
produces OH- ions in water and feels slippery/ tastes bitter
salts
fromed when an acid reacts with a base
natural, synthetic, and universal
what are the 3 types of indicators
natural indicators
comes from plants or natural elements
synthetic indicators
man made and commonly used in labs
phenolphthalein
what indicator remains colorless but turns pink in bases
universal indicator
shows a range of colors to indetify the pH level of a substance
potential of hydrogen
what does pH mean?
acidic subtances
what does a pH scale of 0-6 mean?
neutral substances
what does a pH scale of 7 mean?
basic substances
what does a pH scale of 8-14 mean?
combination reaction
2 or more substances combine to form 1 new substance
decomposition reaction
one substance breaks down into 2 or more simpler substances
single replacement reaction
1 element replaces another element in a compound
double replacement reaction
2 compounds exchange partners to form new compound
combustion reaction
a substance reacts with oxygen and releases heat and energy
chemical equation
to describe reactions clearly and to show substances being involved
reactants
the starting substances
products
the new substances formed
word equation
shows a chemical reaction using the name of substances instead of symbols/formulas
formula equation
uses chemical symbols instead of words