The Periodic Table
Where do protons and neutrons reside?
The nucleus
Why did the eggshell dissolve in the Rubber Eggs Lab?
The vinegar broke down the bonds in the molecules that made up the shell.
Name a reactant from the egg lab.
Vinegar, calcium carbonate
What concept did Le Chatelier come up with?
Equilibrium
Where are the noble gases located on the periodic table?
Group 18
18
Why did adding yeast to hydrogen peroxide produce a faster reaction?
Yeast acted as a catalyst.
Name a product from the egg lab.
Water (H20), Carbon dioxide (CO2) and Calcium Acetate (Ca(CH3COO)2.
How do we determine the net rate of a reaction?
Forward rate minus reverse rate.
Water to ice is an example of what kind of change?
Physical.
How many periods are in the periodic table?
7
The soap lowered surface tension and also broke up the fat molecules in the milk.
When the overall reaction is "happy" what state has been reached?
Equilibrium
What is a rate limiting step?
The slowest step in a chemical reaction. It determines the overall speed of a reaction.
What does greater concentration of a substance do to a chemical reaction and why?
It speeds it up because there are more molecules of a substance in the same volume, resulting in more collisions.
How can you figure out what the atomic number is?
Atomic mass minus protons.
Was the dissolution of the eggshell a physical change?
NO - it was a chemical change.
Name the five factors that can change the equilibrium point.
Substances added, temp, pressure, concentration, total volume.
Stoichiometry means what?
The measurement of how much of a particular substance is needed to fulfill a reaction's requirements.
You observe bubbles and an increase in temperature.
What elements have the same number of energy shells?
Elements in the same period.
When bonds are broken, like in the "Elephant Toothpaste" lab, what was released?
Energy - we could tell because of the heat produced.
Are all reactions made up of a single reaction? If no, what do we call the reactions?
Intermediate reactions.
Acidity is determined by the level of what is a liquid?
Hydrogen ions.
Where are the actenides and lanthanides located on the periodic table?
The bottom two rows.