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chem unit 7
chem midterm
Term | Definition |
---|---|
chemical reaction | occurs when atoms rearrange to form a new substance |
law of mass conservation | matter can't be created or destroyed during a chemical reaction, it can only change forms |
how do chemical reactions occur? | collisions |
collisions | atoms/molecuels collide, which cause them to to interact and rearrange into new substances |
chemical equations | represent what's occuring during a chemical reaction |
reactants | the chemicals at the start of the reaction |
products | the chemicals produced at the end of the reaction |
Coefficents | make sure the equation if balanced |
diatomic elements | elements that exist in their natural state as a molecule exisiting of 2 atoms |
Aqueous | dissolved in water |
ionic compounds break down into... | their ions |
covalent compounds break down into... | their molecules |
Redox reactions | occur when electrons are transferred between atoms during the reaction |
double displacement reactions | occur when 2 ionic compounds react and exchange their cations and anions |
types of redox reactions | synthesis, decomposition, combustion, and single displacement |
types of double discplacement reactions | precipitation and acid-base |
synthesis | making a compound from it's elements, A + B -> AB |
decomposition | breaking down a compound into its elements, AB -> A + B |
Combustion | something combines w/ oxygen, usually produces heat/light |
single displacement | one element takes the place of another element in a compound |
precipitation | 2 aqueous ionic compounds react to form a solid ionic compound |
acid-base | reacts to form water |