CINDERELLA
Balance the following chemical equation:
Al + HCl --------> AlCl3 + H2
2Al + 6HCl --------> 2AlCl3 + 3H2
A reaction that absorbs heat is _____________
Endothermic reaction
The formation of an insoluble solid is called ________________________
Precipitate
What represents a chemical reaction?
Chemical equation
How is a mole ratio used?
It is used to convert moles of one substance to moles of another substance.
State the steps you need to convert from grams of one substance to moles of another substance.
Grams (molar mass) -------> mole ratio ------> Moles (molar mass)
If 2.00 mol of N2 reacts with H2, how many moles of NH3 will be produced? Given the equation:
N2 + 3H2 ---> 2NH3
4.00 mol
According to the equation below, what is the mole ratio of O2 to CO2?
2 C4H10 + 13 O2 → 8 CO2 + 10 H2O
13:8
A _____ is a substance that forms as a result of a chemical reaction.
Product
What is the number of representative particles (Atoms) in a mole
Avogadro's number (6.022 * 10^23)
What is the mole ratio of O2 to SO2 in:
S8 + 8 O2 ---------------> 8 SO2
8 moles of O2/ 8 moles of SO2
The ________________ allows us to convert from moles of one substance in a balanced equation to moles of a second substance in the equation
Mole Ratio
How many moles of N2 are needed to produce 18 moles NH3 in the reaction:
N2 + 3H2 ---------> 2NH3?
9
Given the following equation: 8 Fe + S8 ---> 8 FeS
What mass of iron is needed to react with 16.0 grams of sulfur?
27.9g
A ________ is a substance consumed during a chemical reaction.
Reactant
A reaction that releases heat is
Exothermic reaction
What are three mole ratios present in the following equation?
2HgO ---> 2Hg + O2
2 mol HgO/ 2 mol Hg
2 mol HgO/ 1 mol O2
2 mol Hg/ 1 mol O2
How many moles of H₂O are produced when 5 moles of oxygen are used-- 2H₂ + O₂ → 2H₂O
10
Some cars can use butane (C4H10) as fuel:
2 C4H10 + 13 O2 è 8 CO2 + 10 H2O
How many grams of O2 are needed to react with of 100. grams of butane?
358g
What is the difference between Empirical Formula and Molecular Formula?
The molecular formula is the exact formula with the number of each atoms altogether. The empirical is the simplest whole number ratio of the molecular formula. For example: Benzene's molecular formula is C6H6, but it shares a common factor of 6, so its empirical formula is CH.
_________ is the relationship between products and reactants
Stoichiometry
What are the evidences of chemical reaction?
Color change, a solid is formed, a gas is released, heat/light is produced/absorbed
The mole ratio of C₃H₈ to O₂ is x/y. what would the coefficient of y be?
C₃H₈+ 5O₂→ 3CO₂ +4H₂O
5
What are the 4 types of Stoichiometric Problems?
1) Mole => Mole
2) Mole => Mass
3) Mass => Mole
4) Mass => Mass
Y/N: can we measure moles directly in the lab? Provide reasons to back up your answer
No, we can't