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science q8
chem q8
| Question | Answer |
|---|---|
| three ways to identify a chem reaction | evolution of heat and lighgt, production of a gas, formation of a precipitate |
| synthesis | two or more substances combined to form a new compound |
| decompotion | a ginle compound undergoes a reaction that produes two or more simplier substances |
| single replacement | one element replaces a similar element in a compound |
| double replacement | the ions of two compounds excange places in an aqueous solution to form two new compounds |
| combustion | a substance combines with oxygen, releasgin al arge amount of energy in the form of light and heat |
| when hydrocarbson combust... | they form CO2 and H20 |
| when metals combust they | form metallic oxides |
| metals + nonmetals --> | ionic compounds |
| metal oxides + CO2---> | metal carbonates |
| nonmetalic oxides +h20 --> | acids |
| metal oxides+h20---> | bases |
| *dr -- metallic carbonate | CO2 + metal oxide |
| *dr -- metallic chlroates | salt + 02 |
| *dr -- ionic compounds | metal + nonmetal |
| *sr -- active metals | replace lessa ctive metals |
| *sr -- active metals replce hydogen in H20 to make | hydroxide (metal + OH) and hydrogen gas |
| *sr -- active metals replace hydrogen in acids | to make metallic salts (metal + anoin) and h20 |
| *sr -- active nonemtals replace | less active nonemtals |
| *DDr precipitae often from | in thse reactions |
| precipitate: | a solid that is produced as a result of a chemical reaction in a solution and that separates from the solution |
| the formation of a precipitaste is determined by | a set of rules |
Created by:
lilee256
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