Atoms and Radioactivity
What is the atomic symbol for Silicon?
Si
Dissolving and boiling are examples of what kind of change?
Physical
What type of sunlight can cause skin cancer?
UV
What type of bond exists in the compound BaF2
Ionic
What does the E in VSEPR stand for?
Electron
Name the scientist and the experiment that discovered the nucleus/proton
Rutherford and the Gold Foil Experiment
Which of these is a homogeneous mixture: Copper, Air, Milk, Carbon dioxide
Air
What word describes the fact that electrons can only have certain energies inside an atom?
Quantized
Name this compound: CuO
Copper(II)oxide
Which of the bonds is polar, and which is the negative end? F-F, C=O, C-H, O=O
C=O, O is the negative end
How many neutrons are in an atom of Calcium-41 ?
21
How many micrograms in 2.41g (give answer in scientific notation)
2.41 x 106 micrograms
If carbon formed ion, what charge would it be?
4-
Which of the following bonds is the most polar without being considered ionic? N-O, O-O, N-Cl, Na-Cl
N-Cl
What was our example of an interstitial alloy and what were the elements that make it up?
Steel, Fe and C
Name the isotope (element and mass number) of the product of alpha decay of Pa-231
Actinium - 227
How many L in 361 cm3
0.361 L
What is the name of the group of elements that has 7 valence electrons?
Halogens
Which of the following has an expanded octet on the central atom: BeCl2, PF3, IBr3, H2CO, SiCl4
IBr3
Which of the following has the highest melting point and what type of bonding/structure does it have, that makes it have the highest? CH4, NaCl, SiO2, NF3
SiO2, giant covalent
An isotope of Tc has a half-life of 6.0 hrs. What mass of a 120mg sample would remain after 1.0 days?
7.5mg (4 half-lives)
What is the volume (in cm3) of a 3.70 g piece of gold (density = 19.3 g/cm3)
0.192 cm3
Between B and C, which has the higher first ionization energy? Explain this with reference to radius and Zeff
C: smaller radius and higher Zeff
Which of the following shows RESONANCE? CO2, NF3, CO, H2CO, O3, PF5
O3
Give the molecular geometry name and bond angle(s) of SCl4
See saw, 90 and 120o