# Beautiful Chemistry

### Zn + Pb(NO3)2 –> Pb + Zn(NO3)2, etc.

Want to see something metal? What could be more brutally metal than “lead trees”? Yes, trees of actual lead. A forest of them. And they are chillingly majestic. Granted, they’re tiny and in a solution, but I’m going to overlook that fact.

Study Chemistry with Study Putty

# Atomic Orbital Mnemonics

How does one remember SPDFGHIK…? Remembering the S through K orbitals is the trick. After K, it goes alphabetical. (But skipping S and P, because they’ve already been done.) My search for atomic orbital mnemonic devices only turned up one that had sufficient character to stick those eight seemingly arbitrary letters in my mind.

## The Standard Mnemonic

The one I found was pretty good, though:

# Copyright Law and Images for Educational Use

Click any image in this post to see its source and open license information.

# How to Name Polyatomic Ions

Here are some simple rules for naming polyatomic ions.

Polyatomic ions with more oxygen atoms will end in -ate, and those with fewer oxygen atoms will end in -ite. When there are more than two polyatomic ions composed of the same elements, the prefix hypo- indicates the least number of oxygen atoms, and the prefix per- will indicate the most oxygen per ion.

Less Oxygen More Oxygen
hypo- -ite -ate per-

## How to Make an Oppia Exploration (Ed Tech Reviews)

What is Oppia? Find out about Oppia.org in my previous post, Oppia: Opportunity for Progressive Learning or Open-Content Muddle?

# Creating the Dimensional Analysis Exploration

As I left off in my last post, I tried out Oppia.org by creating an exploration called “Dimensional Analysis for Chemistry.” In short, while the creation process is a little laborious depending on the complexity of the exploration, I was rather pleased with the content creation tools. In particular, I was impressed by the powerful options for setting the feedback rules for user responses. In my opinion, Oppia may have a place in a teacher’s tool belt–or it can just become a creative hobby. Here’s the good and the…almost good, to consider when you look at Oppia.org. Continue reading

# How Do You Memorize the Polyatomic Ions’ Charges?

New in our growing list of Study Putty learning games is a game for memorizing the charges of the polyatomic ions. You can test yourself here (match chemical formulas to charges) and here (match names to charges), or visit the Study Putty homepage to see all our topics.

###### Click the screenshot to play the game!

And if you’re just looking for a quick reference, here’s a list of the polyatomic ions, including the charge. Continue reading