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20 Cards in this Set
- Front
- Back
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know the chemical equation symbols and what they mean |
+means and or with, -> means “makes or “yields” (s) means solid, (L) liquid, (g) means gas (aq) means aqueous (dissolved in h20) |
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seven special gases |
H2, O2, F2, Cl2, Br2, I2 |
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know how to convert from a word equation to chemical equations and vice versa |
convert look for and which will always be plus and then look for makes or yields which is basically the arrow, everything to the left is the product, everything to the right is the reactant, look for state of matter |
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how to count atoms in molecule |
count the atoms present in the subscripts (small number which signifies amount) , coefficient (number in front of molecule stating amount of it) and then parenthesis which groups elements together and all of it is multiplied by number on the outside |
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why you need to balance equation? |
you need to balance the equation so that it follows the law of conservation of matter (mass) which basically states that matter cannot be created or destroyed only changed which is why the amount you start with of a certain molecule in a chemical equation must be there at the end, it cannot just disappear |
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synthesis reaction |
synthesis: a reaction in which two or more substances react to form one substance A+B=AB |
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single displacement |
AKA replacement, reaction in which one element takes the place of another element in a compound A+BC= AC+B (cationic) |
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double displacement |
reaction in which both compounds exchange elements (switch partners)ex. AB+CD-> AD+CB |
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decomposition |
a reaction in which one substance breaks down into 2 or more substances ex. AB equals A+B |
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how does cationic single displacement look |
Anionic: AB+C = AC+B |
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know how to predict products given reactants |
look at what is in there |
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combustion |
any reaction where a carbon compound reacts with oxygen to produce Co2, H20 and lots of energy ex. CX+o2=CO2+H20 |
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chemical equation |
statement of what is happening in a chemical reaction using chemical formulas |
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reactants |
what goes into ar reaction, found on right side |
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products |
what comes out of reaction, found on left side |
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law of conservation of mass = |
matter cannot be created or destroyed only changed |
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physical changes |
appearance of substance is altered but it doesnt change actual substance ex. crushing, dissolving |
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chemical changes |
result of a chemical reaction, release of gas, color change, temperature, ex. firework, rusting |
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physical propertiesc |
can be observed or measured without changing matter on its molecular level ex. color, mass, boiling point |
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chemical properties |
something that can only be observed while a sunstance is reacting (changing into other substance) ex. toxicity, rust |
