General Knowledge/Electron Config.
What is a chemical change vs. a physical change?
A chemical change changes the structure, whereas a physical change is a change in state.
What is 1230 in scientific notation?
What is .00230 in scientific notation?
1.230 x 103
2.30 x 10-3
0.00471 g to ug
4.71 x 103
What is A, X and Z in atom symbols?
Charges of pro, neut, elec
A= mass #(protons + Neutrons)
X = atomic symbol
Z = atomic #(protons=electrons)
+, neut, -
Name the following symbols:
K, Na, P, C, H, N, O, Mn, Mg, Cu, Ag
Potassium, sodium, phosphorus, carbon, hydrogen, nitrogen, oxygen, manganese, magnesium, copper, silver
How many Oxygen atoms are in the reactants?
C - 1
O - 3
Are all the zeros in 10400 significant?
If not, which ones are?
No
104
meters in 12.5 inches?
2.54 cm = 1 inch
.318 m
True or false: 40 is the mass # of Zirconium-40
True
What is a group?
What is a row?
A group is a column
A row is a period
List orbital filling to period 5
1s2s2p3s3p4s3d4p5s
Which zeros are important?
12.0900
0.005060
1. all of them
2. the sandwich and trailing
mass of 30 mL solution with density 1.60 g/mL?
48.0 g
Draw two isotopes of Co.
30
Co
27
28
Co
27
True or false - a period is where one finds the valence electrons
False, it's the group
What is the element with the electron configuration 1s22s22p63s23p64s23d104p65s24d105p6
Xe
What should is the answer with sig figs?
12.0 + 0.909= 12.909
0.091 + 40 = 40.091
12.9
40
2 naturally occurring isotopes have abundances as follows: 54.00 amu (20.00%) and 56.00 amu (80.00%). What is the relative atomic mass of the element?
55.60 amu
How many electrons are in an element with mass # 17 and atomic #5
5
What is the full electron configuration of an element in the 5th period, with 6 valence electrons?
1s22s22p63s23p64s23d104p65s24d105p4
How many sig figs should our answer have?
12.3 x 1
12.567 x 14300.1
1
5
44.65 degrees C
The densest part of an atom of Si has a number equaling 20.
How many electrons, protons, and neutrons are in this isotope?
14 pro, 14, elec, 7 neut