Chapter 1/2
Chapter 2
Chapter 3
Chapter 4/5
Chapter 6
100
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Which target represents accuracy? Precision?
The target on the left (1st target in row) is accurate, but not very precise. The target on the right is precise, but not very accurate.
100
Calculate the % mass of O in the following compound: C12H19NO3
22%
100
What is the photoelectric effect and who discovered it?
Electrically charged particles are released from or within a material when it absorbs electromagnetic radiation - Einstein
100
The number of pi bonds and sigma bonds for this illustration:
9 sigma bonds
2 pi bonds
200
A sodium streetlight gives off yellow light that has a wavelength of 589 nm (1 nm = 1 × 10−9 m). What is the frequency of this light?
5.09×1014 s−1
200
The hybridization of the two carbon atoms in acetic acid?
H3C, sp3
C(O)OH, sp2
200
The molecular formula for a yellow dye that has a percent composition of 75.95% C, 17.72% N, and 6.33% H by mass with a molar mass of about 240 g/mol
C15H15N3
300
Give three examples of intensive properties and three examples of extensive properties.
Intensive:
color, boiling point, temperature, luster, hardness
Extensive:
volume, mass, size, weight, length
300
Calculate energy, E, when n=2
-5.45 x 10-19 J
300
The limiting reactant when 2.00 g of Si and 1.50 g of N2 react in the following equation:
3Si(s)+2N2(g)⟶Si3N4(s)
Silicon (Si)
400
The electron domain geometry and the molecular geometry for TeCl42−
EDG: octahedral
MG: square planar
400
12.915 g of a biochemical substance containing only carbon, hydrogen, and oxygen was burned in an atmosphere of excess oxygen. Subsequent analysis of the gaseous result yielded 18.942 g carbon dioxide and 7.749 g of water. Determine the empirical formula of the substance.
CH2O
500
What is the wavelength when n=6 moves to n=2? Is this visible?
4.10 x 10-7 m
Visible!