Reactions and Changes
Balancing and Moles
Reaction Types
Reaction Rates and Equilibrium
Misc.
100
What is oxidation?
An element losing electrons
100
How many moles of Hydrogen gas are present in this reaction:
N2 + 3H2 ⥬ 2NH3
Three
100
What type of reaction is:
Cu + 2AgNO3 → 2Ag + Cu(NO3)2
Single-replacement reaction
100
What does the lowering of temperature do to reaction rates?
Shifts the equilibrium towards the side that releases energy
100
If I have a low concentration of a substance in my reaction, what will happen to the reaction rate?
Slow down
200
What occurs during a redox reaction?
One element transfers electrons to another element (one gains, while the other loses)
200
What is the molar mass of of nitrate (NO3)?
62.01 grams
200
What type of reaction is:
2 NH3 → 3H2 + N2
decomposition
200
What is the law of conservation of energy?
During a chemical reaction, no energy is created or destroyed. It can only change forms.
300
What is the difference between endothermic and exothermic reactions?
Endothermic: absorbs more energy than it releases
Exothermic: releases more energy than it absorbs
300
How much Hydrogen gas is needed to synthesize with 1 moles of iodine gas to make 2 moles of hydrogen iodide?
2.02 grams
300
What type of reaction is:
3H2 + N2 → 2 NH3
Synthesis
300
What is Le Chatelier's Principle?
Any chemical system in equilibrium will adjust its equilibrium state in such a way as to reduce the effect of any changes made to that system
400
What is activation energy?
The energy needed to get a chemical reaction started
400
Write a balanced chemical reaction for the following statement: "Methane (CH4), combusts with oxygen gas. This forms carbon dioxide and water"
CH4 + 2O2 -> CO2 + 2H2O
400
What type of reaction is:
Na2SO4 +BaCl2 → BaSO4 + 2NaCl
Double replacement
400
What three conditions must be met in the colloidal model?
Reactant particles must collide with each other
They must be properly aligned to rearrange their bonds
There must be enough energy
500
List four of the eight evidences of a chemical change.
Bubbles forming
Precipitate forming
Energy Released
Odor
Temperature change
Color change
Composition change
Burning
500
If I add a substance to a chemical equilibrium, what will that do to my reversible reaction?
Shift the equilibrium towards the other side of the equation
500
Draw a graph of an endothermic reaction that has the following terms: products, reactants, and activation energy.
500
Consider the exothermic reaction: N2 + 3H2 ⥬ 2NH3
What happens if I remove N2?
What happens if I add pressure?
What happens if I lower the temperature?
Remove N2 = shifts towards the left (reactants)
Add pressure = shifts towards the right (product)
Lowers temperature = shifts towards the left (reactants)