Chemical Reactions

a chemical equation that does not indicate relative amounts of reactants and products

• balanced equation

• skeleton equation

• chemical equation

• reactant

a new substance formed in a chemical reaction

• reactant

• product

• balanced equation

• skeleton equation

a starting substance in a chemical reaction

• balanced equation

• skeleton equation

• chemical equation

• reactant

a concise representation of a chemical reaction

• balanced equation

• skeleton equation

• chemical equation

• reactant

an equation in which each side has the same number of atoms of each element

• balanced equation

• skeleton equation

• chemical equation

• reactant

What does the symbol  $\Delta$  in a chemical equation mean?

• a catalyst is needed
  

• yields

• precipitate

• heat is supplied to the reaction
  

What does the symbol  $\leftrightarrow$  in a chemical equation mean?

• the reaction is reversible
  

• an incomplete combustion has occurred
  

• a gas is formed by the reaction
  

• heat is supplied to the reaction
  

If you rewrite the word equation as balanced equation, what will be the coefficient and symbol for fluorine be?
nitrogen trifluoride  $\rightarrow$  nitrogen  + fluorine

•  $F_3$  

• 6F

• 6  $F_2$  
  

• 3  $F_2$  
  

Chemical equations must be balanced to satisfy ______.

• law of definite proportions

• law of multiple proportions

• law of conservation of mass

• Avogadro's principle

 $Al_{2_{ }}\left(SO_4\right)_3\ \ +_{\ _{ }}KOH\ \ \rightarrow\ \ \ Al\left(OH\right)_3\ +\ K_2SO_4\text{}$  What are the missing coefficients for the equation?

• 4,6,2,3

• 1,3,2,3

• 1,6,2,3

• 2,12,4,6