Chemistry Basics
Is ice melting a chemical or physical change?
Physical change
The name of the type of ion when electrons are lost.
Cation
Atoms that have the same number of electrons are ______ with each other.
Isoelectronic
The elements in group 17 are called ____.
Halogens
A double covalent bond consists of how many many shared electrons?
4 shared electrons
The components of this mixture can be easily seen with the naked eye and are distinguishable
heterogeneous
Isotopes have the same number of protons but have different number of ____.
Neutrons
The n=_____ shell is the lowest in energy that may contain p-orbitals.
n = 2
Tendency for an atom to attract electrons when chemically bonded to another atom
Electronegativity
Ionic compounds are made up of large structures consisting of alternating + and – ions and are called _______.
Crystals
705,400
1. How many significant figures
2. Write the number in scientific notation
1. 4 Significant figures
2. 7.05x105
How many protons are in Pb-206?
82
A f sublevel can hold a maximum of _____ electrons, with only _____ electrons in each orbital.
A f sublevel can hold a maximum of 14 electrons, with only 2 electrons in each orbital.
Which atom has the smaller atomic size?
As or Br
Br
What is the molecular geometric shape of CH4?
Tetrahedral
0.0056020
1. How many significant figures
2. Write the number in scientific notation
1. 5 Significant Figures
2. 5.6020x10-3
How many electrons would Pb have if it had a +4 charge?
78
Write the complete (long form) electron configuration AND include how many valence electrons there are in Fluorine (F)
1s2 2s2 2p5 7ve
Which atom has the larger first ionization energy?
Si or Sn
Si
If K and N bonded together, what would the formula be for the compound they would form?
K3N
Perform the following calculation and round your answers to the correct number of significant figures and/or decimal points.
52.06 + 37.6
89.7
Magnesium has three common isotopes. The masses of the first two isotopes and percent abundances are as follows:
24.1687 amu, 78.900%
25.4830 amu, 10.009%
If the atomic mass of magnesium is 24.305 amu, What is its atomic mass?
Mass of other isotope = 24.21 amu
Identify the ion based on their electron configuration and their overall charge
1s2 2s2 2p6 3s2 3p6 with an overall -2 charge
S-2
(Sulfur ion with a -2 charge)
What group number does the electron configuration of p3 end in?
Group 15
is SeCl2 a polar or non-polar molecule?
polar