Conversions
205 grams to kilograms
.205 kilograms
Na2O
Sodium Oxide
How many atoms are in 1 mole of Silver?
6.022 x 1023
Atomic number always tells you number of _______
protons
Melting ice is a ____________ change.
Physical
2.3 kilograms to grams
2,300 grams
Aluminum Chloride
AlCl3
turn 8.5 grams of Iron into moles
.15 moles
Atoms with the same number of protons but different number of neutrons
isotopes
Chemical or physical property:
Flammability
Chemical Property
2.5 Kilometers to centimeters
250,000 centimeters
Iron Oxide
Turn 3 moles of Calcium into grams
120.24 grams
How many electrons does the element zinc contain?
30 electrons
What is the center of the atom made of and named?
Nucleus / protons + Neutrons
What is the following number in scientific notation?
24,300
2.43 x 104
Ca3P2
How many atoms are in .45 moles of gold?
2.7 x 1023 atoms of gold
How many neutrons does Uranium have if it is the isotope Uranium - 238
146 neutrons
Groups on the periodic table indicate the number of __________ ___________ that an element has.
Valence Electrons
Convert 2.5 kilograms to grams then write in scientific notation
2.5 x 103 grams
N2O3
Dinitrogen trioxide
How many atoms of gold are in 100 grams of gold?
3.06 x 1023 atoms of gold in a 100 gram peice
How many protons, neutrons, and electrons does the following atom have:
Aluminum: Charge = +3 / Weight = 27
13 protons, 10 electrons, 14 neutrons
Why is the mass number not an even number on the periodic table?
It is the averages of all the isotopes of that element