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Matter
Atomic Structure
EMS
Periodic Table
Misc.
100
How do you tell the difference between an element and a compound?
An element has only one type of atom (Br2), compounds have 2 or more different types (NaBr).
100
Calculate the number of protons, electrons, and neutrons a Mg2+ cation has. The mass number is 25.
p=12 n=13 e=10
100
What color of light has the least energy?
red light
100
Name the element that touches the staircase that isn't a metalloid.
aluminum
200
What type of change needs to occur to separate a mixture?
physical changes
200
Draw an atom of C-14
p=6, n=8, e=6 two electrons in first energy level, 4 in second each in a separate spot (no pairs)
200
Why do different chemicals emit different colors of light?
They have different electron configurations!
200
What is the name of the family in group 17?
Halogens
200
What is the difference between endothermic and exothermic?
exothermic releases energy (feels warm) endothermic absorbs energy (feels cold)
300
Give an example of a homogeneous mixture
answers will vary.
300
Describe how you would calculate the average atomic mass of two isotopes: Cl-35 , 75% abundant and Cl-37, 25% abundant
Multiply 35 * 75/100 Multiply 37 * 25/100 Add two answers together
300
What happens to frequency as wavelength increases?
decreases by the same amount the wavelength increases.
300
How many valence electrons does a silicon atom have? What charge will it form when it becomes an ion?
4 valence electrons, charge of +4 or -4
300
How did Rutherford's gold foil experiment lead to the discovery of the nucleus?
When he shot alpha particles at the gold foil, most went straight through, but a few were deflected. This meant that they hit something very small, dense, and positively charged (because alpha particles are positive).
400
sodium chloride dissolves in water. Is this a physical or chemical change?
physical! you can evaporate the water (physical change) and get the salt back.
400
How many electrons can each sublevel hold? s, p, d, f
s=2, p=6, d=10, f=14
400
How did the atoms in the flame test lab produce light?
The electrons gained energy from the flame and jumped to a higher energy level then as they released the energy as light as they fell back down to their ground state.
400
List the following in order of increasing electronegativity: Zn, F, Na, He
He, Na, Zn, F
400
Look at the graph of a periodic trend. What trend might this represent?
Ionization energy. Could be electronegativity except the noble gases have values.
500
Alka-Seltzer gives off carbon dioxide when added to water. Chemical or physical change?
chemical change. CO2 is a new substance.
500
What is the electron configuration AND orbital notation for Krypton?
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 Second numbers should be superscripts. Orbital notation drawn on board
500
What is an emission spectrum. How does it differ from a continuous spectrum?
emission spectrum shows bands of color that correspond to the amount of energy each electron is gaining and losing when the atom is excited. A continuous spectrum contains all of the wavelengths of light.
500
Explain the relationship between atomic radius and ionization energy and why it is that way.
Bigger the atomic radius, the lower the ionization energy because the valence electrons are further away from the nucleus and don't have a strong attractive force holding them to the atom.
500
What two elements have an exception to the electron configuration filling pattern? WHY??
Cu--> two half full shells and Cr--> half full and completely full shell lower energy, more stable