Periodic Table
What is made from having 2 hydrogen and 1 oxygen?
Water
Balance this equation: ___ Fe (s) + ___ O2(g)→___ Fe2O3(s)
4Fe+3O2-->2Fe2O3
What is the speed of light?
c= 2.998x10^8 m/s
What is a chemical bond?
a net attractive force between two atoms which occurs due to the interactions of their valence electrons
Equation of converting grams to moles:
# of grams * 1 mol/# of grams= # of moles
What is the name of the symbol ”O”
Oxygen
How many moles ofCaCO3arethere in 15.25 g of CaCO3?
.1524 mol
What do the quantum numbers n, l, and ml describe?
n= describes the size of the orbital
l= describes the shape of the orbital
ml= describes the orientation or direction of the orbital in space
What is the tendency of atoms according to the Octet rule?
atoms tend to form compounds in ways that give them eight valence electrons
Given that the daily recommendation for potassium is 4.7 grams, what is the daily requirement of potassium in moles?
Atomic mass= 39.10 amu
4.7g*1 mol K/ 39.10 g K= .12 mol K
The element Neon is from what group?
Noble gases
What is Avogadro’s number?
6.022x10^23 mol
What is the most reactive nonmetal on the periodic table?
Fluorine
Identify the weakest covalent bond:
C-C
C=C
C=-C
C-C is correct because it has the lowest number of bonds that it takes to break it, making it the weakest
Convert 276 K to Celsius:
276-273.15= 2.85 C
What are the 6 Alkaline Earth Metals?
Be, Mg, Ca, Sr, Ba, Ra
What is the equation for: sodium oxide + carbon dioxide →sodium carbonate
Na2CO3–>Na2O+CO2
Metal reactivity should (increase/decrease) as you move down a group
Increase
How many unpaired electrons does Sulfur have?
2 unpaired electrons
Determine the number of sig figs in 0.05013:
5 sig figs
BONUS: What is the most rare element on Earth?
Francium (Fr)
Balance this equation: ___ C3H6(g) + ___ NO (g) → ___ C3H3N (s) + ___ H2O (l) + ___ N2(g)
4C3H6 + 6NO → 4C3H3N + 6H2O + N2
What is the Pauli exclusion principle?
Since two electrons cannot occupy the same space at the sametime,no two electrons in an atom can havethe same four quantum numbers.
Identify the most polar covalent bond:
O-N
O-F
O-O
O-H
O-N=3.5-3.0= 0.5
O-F=4.0-3.5=0.5
O-O=3.5-3.5=0
O-H=3.5-2.1=1.4 Correct answer
What does the Aufbau principle state?
that electrons fill lower-energy atomic orbitals before filling higher-energy ones.
german for the term “building up”