Unit 1: Atomic Structure
How many protons does sulfur have?
16
Of elements Li, K, and Cs, which has the largest atomic radius?
Cs
Look at the waves on the board. Which wave has a higher frequency?
Wave A.
Write the formula of Copper (II) Cloride
CuCl2
What IMF(s) is/are present in H2?
London-Dispersion
How many neutrons are in Argon-40?
22 neutrons.
Substance X has a mass of 60 g and a volume of 5 mL. What is the density of the substance (with correct units)?
12 g/mL
As the frequency of a wave decreases, energy __________.
decreases
What is the name of P2O?
Diphosphorus Monoxide
I take two unknown substances and mix them in a beaker. The beaker suddenly becomes cool to the touch. Is this process endothermic or exothermic?
Endothermic
Thallium has two isotopes, thallium-203 and thallium-205.
1. What changes between isotopes?
2. Thallium’s atomic mass is 204.38 amu. Which is the common isotope?
Neutron number. Thallium-205.
Why do elements in the same group have similar chemical behaviors?
They have the same number of valence electrons.
The neon atoms in a neon sign emit their characteristic color of light as they transition from the __________state to the ___________ state.
excited, ground
Draw the Lewis Structure of NO3(-1) and name it.
See board. Name: Nitrate
Which compound has the highest viscosity?
H2O, HF, O2, PCl3
HF
What type of ion does fluorine form? AND how many electrons are in a fluorine ion?
Anion (-1). 10 electrons.
Define electronegativity.
The strength of attraction of electrons in a bond.
Write the entire electron configuration of Arsenic (As).
1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d10, 4p3
Draw the Lewis Structure of NiCl2 and name it.
See board. Nickle (II) Chloride.
If I dissolve MgCl2 in water, what type of substance would that be? BE SPECIFIC
homogenous mixture
Draw a Bohr Model of BOTH neutral sodium and the sodium ion.
(Answer on board)
Convert 3,456,000 mL to L. THEN write it in scientific notation.
3.456 x 10^3 L
How many electrons are found in the 3rd sublevel?
18
Draw the Lewis Structure of CO2. Is it polar? Does it have resonance?
See board. It is nonpolar. It does not have resonance.
Explain what is happening on a molecular level when a sample of PCl3 transitions from a gas to a liquid. You must include IMFs and the type of process (endo/exo) in your response.
As the gas particles slow down, they come closer together and more dipole-dipole forces form between the different PCl3 particles. This is an exothermic process since bonds are forming.