Chemical Equations Flashcards
What is the basic “formula” for a chemical reaction?
Reactants—>products
Chemical reaction can be abbreviated as…
rxn
Chemical…are made up of…representing the…and…
Chemical equations are made up of symbols representing the reactants and products.
How do you remember which elements are always diatomic molecules?
HOFBrINCl: Hydrogen, oxygen, fluorine, bromine, iodine, nitrogen, chlorine
What is a catalyst?
A substance that speeds up a reaction but is not used up in the reaction.
What does this symbol do in a chem equation: +
Separates two or more reactants/products.
What does this symbol do in a chem equation: —>
Means “yields/produces,” used to separate reactants from products
What does this symbol do in a chem equation: (s)
Indicates a reactant/product in solid state- placed after formula
What does this symbol do in a chem equation: (l)
Indicates a reactant/product in liquid state- placed after formula
What does this symbol do in a chem equation: (g)
Indicates a reactant/product in gaseous state- placed after formula
What does this symbol do in a chem equation: (aq)
Indicates an aqueous solution, substance is dissolved in water; placed after formula
What does this symbol do in a chem equation:—-> with “heat” or a triangle on top:
Indicates that heat is applied to the reaction
What does this symbol do in a chem equation:—–> with an element symbol (like Pt) on top:
Indicates that the element was used as a catalyst
How do you balance an equation?
Place coefficients in front of substances.
Can you balance an equation by changing subscripts?
No, because that changes the reactants/products themselves.
Why must equations be balanced?
In order to obey the law of conservation of mass.