ordered particles, fixed form
🔷ACS GENERAL CHEMISTRY STUDY GUIDE
Bonding and States of Matter for the ACS Exam
Study Lewis structures, molecular geometry, polarity, gases, liquids, solids, and phase diagrams for ACS general chemistry.
8 key ideas8 flashcards5 practice questions
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Pressure and temperature select the stable state.
close particles, flowing form
separated particles, full volume
Key ideas to know
Start with the relationships between ideas. Then close the notes and explain each one from memory.
- 01
Lewis structures account for valence electrons, bonds, lone pairs, and formal charges.
- 02
Electron-domain geometry follows the number of bonding regions and lone-pair regions around a central atom.
- 03
Molecular geometry names atom positions and omits lone pairs from the geometry name.
- 04
Molecular polarity depends on bond dipoles and three-dimensional geometry.
- 05
The ideal-gas equation connects pressure, volume, amount, and absolute temperature.
- 06
Intermolecular attractions affect boiling point, vapor pressure, viscosity, and surface tension.
- 07
Crystalline solids have repeating order, while amorphous solids lack long-range repeating order.
- 08
A phase diagram marks stable phases and phase boundaries across pressure and temperature.
PART OF THE ACS GENERAL CHEMISTRY GUIDE
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Open the full ACS General Chemistry guide →Two ideas worth correcting now
NOT QUITE
→A molecule with polar bonds must be polar
USE THIS INSTEAD
Geometry can cancel bond dipoles.
NOT QUITE
→Boiling breaks covalent bonds within molecules
USE THIS INSTEAD
Boiling separates particles by overcoming intermolecular attractions.
Flashcards
Answer before opening each card. The effort to retrieve is part of the learning.
1What counts as one electron domain?Show answer ＋
One bond region, whether single or multiple, or one lone pair.
2What geometry has four electron domains and no lone pairs?Show answer ＋
Tetrahedral.
3Why can carbon dioxide be nonpolar with polar bonds?Show answer ＋
Its linear bond dipoles cancel.
4What temperature scale is used in gas laws?Show answer ＋
Kelvin.
5What does vapor pressure measure?Show answer ＋
Pressure from vapor in equilibrium with its liquid at a stated temperature.
6Which attraction exists between all particles?Show answer ＋
London dispersion forces.
7What is the triple point?Show answer ＋
The pressure and temperature where solid, liquid, and gas coexist at equilibrium.
8What is the normal boiling point?Show answer ＋
The temperature where vapor pressure equals one atmosphere.
Explain it in your own words
Use the answer as a check after you have written or spoken your response.
01How do you select the best Lewis structure?
Count valence electrons, satisfy common octets where applicable, then compare formal charges and atom placement.
02Why does water boil above hydrogen sulfide?
Water molecules form stronger hydrogen-bond networks.
03What happens to gas volume when Kelvin temperature doubles at constant pressure and amount?
Volume doubles under ideal behavior.
04How can a phase diagram identify sublimation?
Follow a path that crosses directly from the solid region to the gas region.
05Why can a larger nonpolar molecule boil above a smaller one?
Greater polarizability can produce stronger dispersion attractions.
Related study materials
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