Definitions
Counting Elements
Counting Atoms (1 minute timer)
Balanced or Not? (1 minute timer)
Open or Closed System?
Atomic Structure
Atoms & Ions
100
What is a superscript?
a number found at the top, right of an element symbol
Ex: Mg+2 the +2 is written in superscript
100
How many elements in NaCl?
2
100
How many atoms of sodium are in 2NaCl?
2
100
Balanced or Not?
no
100
a campfire on the beach
open, because matter appears to be lost
100
Where are the protons located?
in the nucleus
100
What is the charge if there are more protons than electrons?
+, positive
200
What is a subscript?
a number written to bottom right of an element symbol
Ex: H2 the 2 is written in subscript
200
How many elements in MgSO4?
3
200
How many atoms of sulfur in 3MgSO4?
3
200
Balanced or not?
yes
200
mass stays the same before and after the reaction
closed, because matter has not been lost
200
Where are the electrons located?
In the electron rings (AKA atomic orbitals, energy rings, electron cloud, energy levels, etc)
200
What is the charge if there are more electrons than protons?
-, negative
300
What is a coefficient?
a number written in front of a chemical formula
Ex: 3HCl the 3 is a coefficient
300
How many elements in Al2(CO3)3?
3
300
How many atoms of oxygen are in 3 Al2(CO3)3?
27
300
Balanced or not?
yes
300
gas is released into a balloon during a chemical reaction
closed, because you can catch the gas to get the same mass
300
Where are the neutrons located?
In the nucleus
300
If an atom is neutral, what 2 things are equal?
protons and electrons
400
what does the Law of Conservation of Matter say?
matter cannot be created or destroyed.
400
How many elements in NH4C2H3O2?
4
400
How many atoms of hydrogen are in NH4C2H3O2?
7
400
Balanced or not?
yes
400
2Mg + O2 --> 2MgO
closed, because the equation is balanced
400
Where is all of the mass of the atom located?
in the nucleus (protons + neutrons)
400
What particle gives an atom its identity?
protons
500
What is a closed system?
a system where energy can be exchanged but NOT matter.
No mass (matter) is lost & the total mass of the system remains the same.
500
How many elements in Ga2(HPO4)3?
4
500
How many atoms of hydrogen are in 2 NH4C2H3O2?
14
500
Balanced or not?
no
500
6CO2 + 6H2O → C6H12O6 + 3O2
open, because the equation is not balanced
500
How many electrons can fit on the 1st & 2nd energy rings?
2, 8
500
What are the masses of protons, neutrons, and electrons?
p = 1 AMU
n = 1 AMU
e = 0 AMU