Chemical Balancing
Molecules and Moles
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Throwback
100
Balance the following chemical reaction:
3 Fe and 2 O
100
What is a mole?
A unit of measurement. Tells us how many things we have (molecules, atoms, particles, gummy bears, etc.)
100
What does a catalyst do?
Speeds up a reaction by lowering the activation energy.
100
What type of reaction is this?
Single replacement
100
Dry ice is an example of what type of phase change?
Sublimation
200
A+2B ⇌ C+D
If we take away some of B, which way does the system shift?
Left
200
How can we determine how many grams of an element are in one mole?
Periodic table atomic mass
200
What does the Law of Conservation of Mass say?
Atoms are neither created nor destroyed in a reaction. (Stuff doesn't just disappear)
200
This is what type of reaction?
Decomposition reaction
200
Name an element from the periodic table that has a high electronegativity.
Upper right
300
What does Le Chatelier's Principle say?
If a dynamic equilibrium is disturbed, the system will compensate for the change.
300
What is Avogadro's Number?
6.02 x 1023
300
In a chemical equation, what do we call the big numbers in front of the molecules? What do we can the small numbers within the molecules?
Coefficients, subscripts
300
This is what type of reaction?
Synthesis Reaction
300
We use distillation to separate what types of mixtures? Bonus (200): How does distillation work?
Liquids that have different boiling points. Boil the one with the lowest boiling point, it evaporates and condenses into separate container.
400
A(g) + 2B(g) ⇌ C(g) + D(g)
If we add pressure to the system, which way will it shift? And why?
Right
400
Place the following in order from least to greatest:
Atom
Mole
Electron
Molecule
Electron, Atom, Molecule, Mole
400
Balance the following equation:
P4O10 + H2O ---> H3PO4
1, 6, 4
400
Just by looking at a chemical equation, how can you tell if it is reversible or irreversible?
The single or double arrows
400
What is one way we can determine if one liquid is more dense than another?
pour into container and see which one is on top and bottom
500
What three things can cause a chemical equation to not have dynamic equilibrium (be out of balance)?
Concentration, temperature, and pressure
500
What is the difference between an element and a molecule?
Element: single substance found on periodic table
Molecule: many elements bonded together
500
Give an example of an exothermic reaction and an example of an endothermic reaction.
Exothermic: burning wood, yeast and hydrogen peroxide
Endothermic: photosynthesis, epsom salts in water
500
What type of reaction is this?
Double replacement
500
Draw a Bohr diagram of an atom of Magnesium.
Should have 11 electrons and 3 orbitals