Balancing Equations
What does balancing a chemical equation mean?
Equal number of element reactants and products on both sides of a chemical equation.
In a chemical reaction, one of the chemical reactants is present in ________ to make sure that the limiting reagent is completely consumed.
Excess
The substances that start a chemical reaction are called...
How many atoms are in a mole?
6.02*10^23
What are the four variables used to describe the characteristics of a gas?
Volume (L), Temperature (K), Amount of Moles (n), and Pressure (atm, kPa)
Which coefficient placed before HCl will balance the following equations? Zn+HCl -> ZnCl2+H2
2
CH3CH2OH+3O2 -> 2CO2+3H2O
What would be the limiting reactant in the reaction if 1 mole of oxygen gas and 1 mole of ethanol (CH3CH2OH) reacted with each other?
The substances produced in a chemical reaction are called...
products
To convert from moles to grams...
Multiply using atomic/molar mass.
What will happen to the volume of a gas under constant temperature if the pressure increases?
4 NH3 + 5 O2
The Haber process generates ammonia from nitrogen and hydrogen gas through the following chemical equation.
N2+3H2 -> 2NH3
Which is the excess reagent in the Haber reaction if equal moles of Hydrogen and Nitrogen are used?
Nitrogen
During a chemical reaction...
Divide by 6.02*10^23.
How are pressure and volume related?
Indirectly
Balance the following equations:
___C2H6O + ___O2 -> ___H2O + ___CO2
C2H6O + 3O2 -> 3H2O + 2CO2
How many moles of iron(iii) oxide are produced from 3.0 moles of oxygen and excess Iron Sulfide as described by the chemical equation below? 4FeS + 5O2 -> 2Fe2O3 + 4SO2
1.2 moles
What type of reaction is...
2H2 + O2 -> 2H2O
Synthesis
How many moles of iron in a sample that contains 7.91*10^23 atoms of iron?
1.31 mol Fe
Pressure is caused by...
Gas molecules colliding with surfaces of the container.
___CO2+___H2O ->___C6H12O6+___O2
6CO2+ 6H2O -> C6H12O6+ 6O2
8Fe + S8 -> 8FeS
If we have 293g Fe and 17.2 g S8, how many grams of FeS will be created?
47.1 g
What type of reaction is...
CH4 +2O2 -> CO2 + 2H2O
Combustion Reaction
How many sulfur atoms would be present in 41.8 moles of sulfur?
2.52*10^25 S atoms
A balloon will pop in the atmosphere because...