## Search found 8 matches

Sun Feb 07, 2016 9:34 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Balancing Equations
Replies: 1
Views: 258

### Balancing Equations

When is it okay to have fractions as the coefficients when you balance a reaction? Only for formation equations?
Sun Jan 17, 2016 10:15 pm
Forum: Phase Changes & Related Calculations
Topic: State Properties
Replies: 4
Views: 485

### Re: State Properties

Heat is not a state property because it is dependent on the path (how the heat changes from initial state to final state). For example, the heat function can change depending on if a reaction takes place under constant pressure, or content volume. Temperature on the other hand is depends on the stat...
Sun Jan 10, 2016 10:07 pm
Forum: Phase Changes & Related Calculations
Topic: Required and Released Energy
Replies: 3
Views: 388

### Re: Required and Released Energy

A bond is formed when the resulting molecule is more stable (lower energy), so therefore if two atoms form a bond, energy is released to reach this lower energy state. Energy is required to break a bond because as stated before, a bond is more stable (lower energy), so to break a bond and return two...
Sat Nov 28, 2015 4:47 pm
Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
Topic: Video: Buffer Solution, Henderson-Hasselbalch Equation
Replies: 4
Views: 743

### Video: Buffer Solution, Henderson-Hasselbalch Equation

Video: Buffer solution
Wed Oct 21, 2015 2:05 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Increasing polarization
Replies: 3
Views: 511

### Re: Increasing polarization

N^3- and O^2- have the same number of electrons, but O has more protons, so it has a stronger pull on it's electrons. N^3- would have a larger ionic radii because it's electrons experience less of a pull, so they have more polarizability.
Sun Oct 18, 2015 11:51 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bonding vs Lone pair repulsion
Replies: 1
Views: 211

### Bonding vs Lone pair repulsion

Why does a lone pair of electrons repel more than a bonding pair of electrons?
Sun Oct 18, 2015 11:24 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: "Polarizable" and Covalent Character
Replies: 1
Views: 707

### Re: "Polarizable" and Covalent Character

If the electrons of an atom are highly polarizable then they are easily displaced by neighboring atoms. So in an ionic bond, there is a cation and an anion, and the cation, having a positive charge, can polarize (or displace) the electrons of the anion. This causes electron density distortion (the e...
Sun Oct 18, 2015 11:00 pm
Forum: Ionic & Covalent Bonds
Topic: Homework 3.77
Replies: 1
Views: 277

### Re: Homework 3.77

HCl has greater ionic character than HI because there is a greater difference in electronegativity between H and Cl than H and I, and the greater the difference in electronegativity, the more ionic the bond. (Electronegativity increases across a period and decreases down a group.)