Chemical Reactions
Where are reactants located in a chemical equation?
What is the FIRST step to balancing chemical equations if you're given the reaction as a sentence/words?
Determine the correct formulas for all substances
Balance the following equation: _____N2 + ____H2 ---> ____NH3
Balance the following chemical equation:
___ C + ___ S8 ---> ___ CS2
4 C + 1 S8 ---> 4CS2
When a substance contains only nonmetals (or maybe some metalloids, ok) you name it by...
prefixes to say how many, end in "ide" on last word
Where are the products located in a chemical equation?
On the right.
Which part of a chemical equation can you change to balance?
Coefficients
Balance the following Equation:
_____KClO3 ---> KCl + ______O2
2KClO3 ---> 2KCl + 3O2
Balance the chemical equation:
__ Li + __ H2O ---> ___ LiOH + ___ H2
2, 2, 2, 1
When naming something made out of ions, how do you name it?
name the cation, name the anion
most transition metals, lead, and tin require roman numerals
polyatomics have unique names
end monoatomic anion ending to "ide"
NAME the reactants and products in the following chemical equation: H2 + NaCl ---> H2S + Cl2
Reactants: hydrogen gas (diatomic hydrogen) and sodium chloride
Products: hydrogen sulfide (hydrosulfuric acid) and chlorine gase (diatomic chlorine)
If you don't add a coefficient in front of a molecule, you have _______ of that molecule.
One
Balancing chemical equations:
____ Cs + ____ N2 ----> ____ Cs3N
6, 1, 2
Balance the following equation:
___NaBr + ____CaF2 ---> ____NaF + ____CaBr2
2, 1, 2, 1
Describe the following formula reaction in words.
Al(OH)3 + HBr --> AlBr3 + H2O
aluminum hydroxide reacts with hydrobromic acid (accept hydrogen bromide) to form aluminum bromide and water
What does the law of conservation of mass state?
The law of conservation of mass states that matter durning a chemical change can neither be created nor destroyed.
Which element should you worry about balancing LAST in this equation? O2 + CH4 --> CO2 + H2O
Oxygen, because you find it alone in a substance
Balance the following equation:
____P + _____O2 --->_____P2O5
4, 5, 2
Balance the following chemical equation:
___ N2 + ___ O2 ----> ___ N2O5
2 N2 + 5 O2 ----> 2 N2O5
Describe the following formula reaction in words.
H3PO4 + Ca(OH)2 --> H2O + Ca3(PO4)2
phorphoric acid (accept hydrogen phosphate) reacts with calcium hydroxide to yield water and calcium phohphate
What is the difference between what a coefficient does and what a subscript does?
Coefficients = how many molecules (or fomrula unites) we have, subscripts = how many atoms of a certain things we have in a molecule (or formula unit)
Explain why we balance chemical equations
To validate that the Law of Conservation of Mass is true.
Write a chemical equation for the reaction of propane (C3H8) and oxygen to yield carbon dioxide and water.
_1_C3H8 + _5_O2 ---> __3__CO2 + __4__H2O
Write a balanced chemical equation for iron(II)sulfide reacting with oxygen to produce iron(III) oxide and sulfur dioxide.
4 FeS + 7 O2 --> 2 Fe2O3 + 4 SO2