Test 4 - Part 1

Inter vs Intra-
Molecular Forces

• INTRA is stronger than INTER

• INTRA - WITHIN or INSIDE

• INTER - between

• INTRA Types

  • Ionic & Covalent bonds

• INTER types

  • London dispersion, dipole-dipole, hydrogen bonding (NOF)

  • H-Bonding is the strongest, London Disp. is the weakest

Multiple Choice

Intermolecular forces are the forces

• within molecules

• between molecules

Multiple Choice

Intramolecular forces are the forces

• within molecules

• between molecules

Multiple Choice

Which of the following is an intramolecular force?

• Hydrogen Bonding

• Polar Covalent Bonding

• London Dispersion Forces

• Dipole-Dipole Interactions

State's of Matter
& Particle Diagrams

Multiple Choice

Select the response that best matches the two pictures

• a. Solid element

  b. gaseous element

• a. gaseous, compound

  b. solid compound

• a. Liquid, element

  b. Gaseous, Compound

• a. liquid, element

  b. Gaseous, Mixture of compounds

​UNIFORM = SAME NOT UNIFORM = DIFFERENT

Multiple Choice

This is an example of a ___________ mixture

• Homogenous

• Heterogenous

• Element

• Compound

Physical vs Chemical Changes

​Chemical:
The change CANNOT be UNDONE.

Physical:
The same substance is present after the change

Multiple Choice

If the leaves begin spread across the ground and you rake them up. What type of change is this?

• Physical

• Chemical

Multiple Choice

Which example best illustrates a physical change?

• 
  iron rusting

• 
  charcoal burning

• 
  an ice cube melting

• 
  a marshmallow burning

Multiple Choice

If you burn leaves to create ash... What type of change is this

• Physical

• Chemical

Multiple Choice

A new substance is formed in a physical change.

• True

• False

Molar Mass & Conversions

​ Subscript's Parenthesis & Coefficients

Multiple Choice

How many of each atom are in the compound? 2Fe₂O₃

• Fe - 4 and O - 5

• Fe - 8 and O - 6

• Fe - 2 and O - 5

• Fe - 4 and O - 6

Multiple Choice

What does the 4 in 4K₂O mean?

• There are four potassium oxide molecules

• There are two potassium oxide molecules

• There are four potassium molecules

• There are eight potassium oxide molecules

​always use two decimal places for mass | unit = g/mol

Multiple Choice

What is the molar mass of Br₂

• 79.9 g/mol

• 159.8 g/mol

• 70.9 g/mol

• 141.8 g/mol

​Use dimmensional analysis to set up

Multiple Choice

How many moles are in 20 grams of Ca (Calcium)?

• 0.5

• 1

• 3

• 20

Multiple Choice

How many molecules are in 2.5 mol of NaCl?

• 1.51x10 ²³ molecules NaCl

• 
  146 molecules NaCl

• 
  4.15 molecules NaCl

• 
  1.51x10²⁴ molecules NaCl

Multiple Choice

If we have 0.678 mol of CO₂ then how many grams are there?

• 32.0 g CO₂

• 29.8 g CO₂

• 0.325 g CO₂

• 0.015 g CO₂

Multiple Choice

Select the conversion factor you should used for the following problem.

How many atoms/molecules can be found in 367 g of N₂

• 1 mole = Molar Mass "g"

• 1 mol = 6.02 x 10²³

• Both

• Neither