Math/Calculations
How many moles are in 85 grams of Barium?
85g/137.33g= 0.6189 moles of Ba
What are two observable features that tell you if a chemical reaction has occurred?
Change in color
Production of an odor
Change in Temperature
Bubbles produced
Formation of a precipitate
How many valence electrons does Sulfur have?
6
How many Protons, Neutrons, and Electrons are in Potassium?
Protons: 19
Neutrons: 20
Electrons: 19
Name a Halogen?
F, Cl, Br, I, At
What is the density of an object if it has a mass of 256 grams and a volume of 22mL?
D= M/V
D= 256 grams/22 mL
D= 11.636 g/mL
What is an Isotope?
What is the number of Protons, Neutrons, and Electrons in 13C?
Two or more forms of an element with the same number of protons but a different number of neutrons.
13C= 6 protons, 6 electrons, 7 neutrons
What tells you the number of valence electrons?
What tells you the number of electron shells?
Group Number
Period Number
Name the Element that is an alkaline-earth metal and is in the 5th period?
Strontium
Write 6 facts about Radon using the periodic table
86 protons, 136 neutrons, 86 electrons, Atomic mass of 222, Noble gas, 8 Valence electrons, group 8, period 6, inert, chemically stable, non-reactive, P-Block, Gas, Density of 9.73 g/L, Dangerous gas in Iowa basements
What is the mass of 10mL of water?
1mL=1g
Density of water = 1 g/mL
Mass= 10 grams
Describe an Exothermic Reaction?
Describe an Endothermic Reaction?
A reaction that gives of heat/energy (gets warm)
A reaction that requires heat/energy from the surroundings (gets cold)
What keeps an electron revolving around an atom?
What keeps the electrons from falling into the nucleus?
Protons (+) attract electrons (-)
Electrons (-) repel electrons (-)
What block is Iron in?
How many electrons can that block hold?
D-Block
Can hold up to 10 electrons
Draw the periodic trend for Density?
Down group: Increases
Across period: Increases
More particles=Denser atom
0.450 grams of Fe contains how many atoms?
Grams -> Moles -> Atoms
0.450g/55.85 = 0.008057 Mol Fe
0.008057 Mol * 6.02*1023 atoms =
4.85*1021 atoms of Fe
What is the difference between Mass, Volume and Density?
Mass measures how much matter is present
Volume measure how much space something takes up
Density measures the mass in a given volume
-(space in between particles)
What is the electron configuration for Cl
How many unpaired electrons does it have?
1s2
2s2
2p6
2s2
3p5 (One Unpaired Electron)
What is the most reactive Non-Metal
Flourine
What element has similar properties to Kr?
Name one of those properties?
Ne, Ar, Kr, Rn
Full valence shell, Has the Octet, 8 valence electrons, Inert, Chemically Stable
You measured a metal to have a mass of 24.4 grams and a volume of 3.6mL. What is its Density?
The metal is discovered to be Zirconium and should have a density of 6.51 g/mL. What is your Percent Error?
D = M/V
D= 24.4g/3.6mL D= 6.777 g/mL
% Error= (6.77 - 6.51) / (6.51)
% Error = 4%
What is the main difference between nuclear fission and nuclear fusion?
Fusion combines two small atoms to make a larger one.
Fission breaks apart one unstable atom into two more stable atoms.
Noble gasses are _______ stable.
All of the elements are _______ stable.
Chemically (non-reactive)
Electrically (same # of p and e-)
Why is Francium the most reactive metal?
(Think Size)
Many shells=Large atom=weak electrostatic force=easy to lose one electron
What causes the periodic table to have observable patterns and trends?
The atomic structure
Protons, Neutrons, Electrons