Atomic Symbols
What element has 20 protons and a mass of 40 g/mol?
Calcium
What is Avogadro's number and what does it count?
6.022 x 1023
Things, usually molecules or atoms
What is the electron configuration for Magnesium?
[Ne]3s2
How many valence electrons does calcium have?
2 valence electrons
What is density and what are its units?
D= m/v = g/mL
How many protons, electrons, and neutrons does the element Sulfur have?
P+: 16
E-: 16
N: 16
How many moles are in 85.47g of Rubidium?
1 mol
What is the electron configuration for chromium? How many unpaired electrons does it have?
[Ar]4s23d4
4 unpaired electrons
How many valence electrons does chlorine have? Name 3 elements/ions that are isoelectronic with Cl-.
7 valence electrons
Si4-, P3-, S2-,Ar, K+, Ca2+, Sc3+, Ti4+
What is a buffer and what does it resist?
A buffer is a weak acid-conjugate pair that resists changes in pH when H+, OH-, and water are added.
What element has the atomic symbol of Se? How many protons, electrons, and neutrons does it have?
Selenium
P+: 34
E-: 34
N: 44
How many grams of Copper are in 0.47 moles of copper?
30 grams of copper
What is the electron configuration of Br? How many unpaired electrons does it have?
[Ar]4s23d104p5
1 unpaired electron
How can we make ionic bonds stronger?
1. Decrease distance between ions
2. Increase the charges
What are the types of nuclear radiation that we learned?
Alpha particle
Beta particle
Gamma particle
Positron
What element has the atomic symbol of Mn? How many protons, electrons, and neutrons does Mn have?
Manganese
P+: 25
E-: 25
N: 29
Tin's molar mass is 118.71 g/mol. How many moles are in 182.g of tin?
1.53 moles
What is the extended electron configuration of silver?
1s22s22p63s23p64s23d104p65s23d9
What is the electron and molecular geometry of NH3? What is its ideal bond angle? Is it polar?
Tetrahedral, trigonal pyramidal
<109.5o
Yes, it is polar
In general, what are the relative melting points and boiling points of ionic compounds compared to covalent compounds?
Ionic compounds' melting and boiling points are much higher than covalent compounds'.
What element is Xe? How many neutrons does a neutral Xe have? How many moles are 100.g of Xe?
Xenon
77 neutrons
0.762 moles
Krypton is a noble gas. What is its molar mass? How many grams are in 2.12 moles of krypton?
Molar Mass = 83.80 g/mol
178 g of krypton
What is the extended electron configuration of sulfur? How many unpaired electrons does it have?
1s22s22p63s23p4
2 unpaired electrons
What are the electron and molecular geometry of CH2O? What is the ideal bond angle? Is it polar?
Trigonal planar, trigonal planar
120o
Yes, it is polar
How does soap work?
Soap's polar 'head' is attracted to dirt(non polar) while soap's non polar 'tail' is attracted to water(polar). The soap then washes the dirt and water down the drain.