Balancing Chemical Equations
This law states that matter cannot be created or destroyed in a chemical reaction.
What is the Law of Conservation of Mass?
This unit represents 6.022×10^23
What is a mole?
A reaction where two or more substances combine to form one product.
What is a synthesis reaction?
Balance the equation:
___ H2+____ O2→ ___ H2O
2 H2+ O2→ 2 H2O
These numbers are placed in front of chemical formulas to balance equations.
What are coefficients?
2H2+O2→2H2O
What is 1:1?
A reaction where one compound breaks apart into simpler substances.
What is a decomposition reaction?
Balance the equation:
____ Fe+___ O2→_____Fe2O3
4 Fe+ 3 O2→ 2 Fe2O3
When balancing equations, you cannot change these because it would change the identity of the substance.
What are subscripts?
n chemistry, the mole is useful because it allows scientists to convert between particles and this measurable laboratory quantity.
What is mass (grams)?
A reaction where one element replaces another element in a compound.
What is a single replacement reaction?
Given the reaction
N2+3H2→2NH3
If 28 g of N₂ reacts, how many grams of NH₃ are produced?
What is 34 grams of NH₃?
A student balances the equation
H2+O2→H2OH_2 + O_2 → H_2OH2+O2→H2O
by changing the formula to H₂O₂. This rule of balancing equations was broken.
What is “you cannot change subscripts / chemical formulas when balancing equations”?
To calculate the molar mass of a compound, you must add together the atomic masses of these components in the chemical formula.
What are the atoms (or elements) in the compound?
A reaction where two compounds exchange ions to form two new compounds.
What is a double replacement reaction?
What is the molar mass of CaCl₂?
What is 111 g/mol?
When balancing equations, chemists often leave this element for last because it appears in many compounds and can complicate balancing.
What is oxygen?
Chemists use mole ratios from balanced equations to predict how much of this will form or react in a chemical reaction.
What is the amount of product (or reactant)?
This reaction occurs when a hydrocarbon reacts with oxygen to produce carbon dioxide and water.
What is a combustion reaction?
C3H8+O2→CO2+H2O
If 44 g of propane reacts, how many grams of CO₂ form?
What is 132 g CO₂?