Chem 1205 Recitation #2

Recitation #2
Question 1: Match the terms in the box below to each description provided (1 term each). Not every term will be used.

Solid, Liquid, Gas, Physical Change, Chemical Change, Mixture, Element, Compound
Description Term
Methane is composed of a carbon atom with 4 hydrogen atoms attached.
At room temperature, the particles of methane are far apart and moving quickly in random directions.
During combustion, methane is converted to carbondioxide and water through the release of energy.
Rubbing alcohol contains water with a small amount of isopropanol.
In rubbing alcohol, the particles are gliding around each other (interacting) within their container.

Question 2: Convert 68.50ºF to Kelvin (Round your answer to two decimal places):
TF = 1.8TC + 32 TK = TC + 273.15
Solid Liquid Gas
Physical Change Chemical Change
Mixture Element Compound

Question 3-4: Complete the given conversions. Use appropriate significant figures in your answer:
 7400 yards into kilometers (1 yard = 3.00 feet, 1 mile = 5,280 ft, 1 km = 0.621 miles)
 4.75 qts to L (1qt = 946 mL)
*you can submit your answer in scientific notation to blackboard using “E” for the exponent. E.g. 0.0034 = “3.4E-3”
Question 5: The density of coconut oil is 0.9030 g/mL. You have a recipe that calls for 95.30 g. What volume would you measure out in mL? Use appropriate significant figures.
Question 6: Complete the table for the given isotopes:
Number of Protons
Number of Neutrons
Number of Electrons
Charge Mass
Number
Element
Symbol
AZX Notation
(practice)
+4 119 Sn
53 54 127
Chem 1205 Recitation #2
Question 7-9: Determine the missing isotope from each nuclear decay: (name the isotope)
 8𝑂
15 → ? + +1𝑒
0
 87𝐹𝑟 221 → 𝐴𝑡 85
217 + ?
 ? → 16𝑆
32 + −1𝛽
0
Question 10: What elements are represented by the given electronic configurations?
 1s22s22p3
 1s22s22p63s23p5
 1s22s22p63s23p64s1
Question 11-12: Draw the electron dot diagrams for the given elements:
 Bromine
 Magnesium