IMFs and Other Semester Stuff

IMFs

100

What are all of the types of forces that exist in CH₄?

London Dispersion Forces

200

Describe what London Dispersion Forces are.

Temporary imbalance of electrons in a compound/molecule/atom

300

List all of the forces found in the Phosphite Ion. What type of bond

LDFs, D-D (3.5-2.1 = 1.4)

400

Put the following compounds in order of increasing boiling point:

C₃H₈, CH₄, CH₃OH

CH₄, C₃H₈, CH₃OH

500

List all of the intermolecular forces fond in CO_2. How would CO₂'s vapor pressure compare to water's?

LDFs ONLY. CO₂ has a higher vapor pressure than water

Convert numbers and Sig Figs? OK!

100

How many sig figs are in: 204

3

200

How many sig figs are in: 000.002301

4

300

What is 1,02 x 54.0. Use Sig Figs, Yo. 

5,500

400

What is 12.4 + 82.99? Use Sig Figs, Yo.

95.4

500

Using dimensional analysis, convert 1.24 hours to seconds. Round your answer to the correct number of significant figures.

4,460 seconds

Atoms and stuff

100

What are the four letters you were told to remember pertaining to electron configurations?

s, p, d, f

200

How many valence electrons are in the electron configuration: 1s², 2s², 2p⁶, 3s², 3p¹?

3

300

Spell the element with the symbol Sc

Scandium

400

How many total electrons are found in the 3rd energy level?

18

500

Bromine has two stable isotopes: Bromine-79 (79Br) and Bromine-81 (81Br), with natural abundances of approximately 50.69% and 49.31%. Calculate Bromine's atomic mass. Round your answer to four significant figures

79.99 amu

Randoms

100

What is the difference between a pure substance and a mixture? Give and example of each

pure substance: one thing (element)

Mixture: more than one, not chemically combined (salad)

200

Who was that one guy who found the nucleus and identified that it was small, positively charged and found at the center of the atom?

Rutherford

300

Air filters are physical perforated medium with incredibly tiny holes for things to travel through. Which gas would have a harder time going through the filter? Chlorine gas or bromine gas? and why? (only hint: Bromine is found below chlorine on the periodic table). 

Bromine. DOWN BIG!

400

Explain specifically why 'across small' happens on the periodic table when moving from left to right

Elements have the same number of occupied energy levels but a greater nuclear charge at their core (more protons), which pull on the electrons and make the element smaller.

500

A unknown chunk of metal with a mass of 0.25 g was dropped into a graduated cylinder. The cylinder's volume changed from 15 mL to 25 mL upon the addition of the metal. What is the metal's density? Include the correct unit with your answer

0.025 g/mL