Chem Review Quiz Flashcards
Density equation?
D= m/v
Given density and volume, what is the equation for mass
M= D(V)
Given mass and density, what is the equation for volume?
V= m/d
If an element is an ion, that means it is:
Charged
If I know the number of electrons in an ion, what formula do I use to find its charge?
Protons - electrons
Define isotope
Atoms of the same element with different numbers of neutrons
Sublevels in the 1st, 2nd, 3rd, 4th energy level
1st- s
2nd- s, p
3rd- s, p, d
4th- s, p, d, f
How many orbitals and electrons are in the s sublevel? P? D? F?
S- 1 orbital, 2 electrons
P- 3 orbitals; 6 electrons
D- 5 orbitals; 10 electrons
F- 7 orbitals; 14 electrons
What are the max possible electrons in the 1st energy level? 2nd? 3rd? 4th?
1st- 2
2nd- 8
3rd- 18
4th- 32
What are valence electrons?
Electrons in the highest energy level
What rules do you need to keep in mind when using a periodic table to compare the size of 2 or more elements?
Size increases from right to left and from top to bottom.
What is an ionic bond?
A bond between two oppositely charged ions
In general, the stronger the bonds, the _______ the bonds.
Shorter
In general, double bonds are _______ than triple bonds.
Longer
Bonds with a low bond energy are ________ than bonds with high bond energy.
Weaker
Combustion formula
CxHx + O2 —-> CO2 +H2O
How do you find the percent composition?
1) find molar mass of overall ion
2) find molar mass of the element you’re trying to find
3) divide the molar mass of the element by the molar mass of the ion
4) multiply by 100
How do you find the empirical formula of a compound?
1) take the percentage given and divide them by mass of the single element
2) divide the answers by the smallest answer
3) your answer from this is your subscript
How do you find the molecular formula for a compound?
1) divide the number given by the molar mass of the compound
2) take this answer and multiply it by the subscripts
What is the SI unit for length, mass and time?
Length: meters
Mass: kilogram
Time: second
