4 "N"
A Gluten-Free Category
Homophone Connection
Name the Band, pre 2000s albums
Chemistry Glossary
100

To show up somewhere you're not expected is to show up this way

Unannounced

100

A type of graph representing percentages as sections of a circle, it'd be weird to get one à la mode 

Pie-Chart 

100

A malt beverage, or to be unwell

Ale/Ail

100

Highway to Hell, Back in Black, Who made Who

AC/DC

100

Covalent bonds share valence these

electrons
200

It's a 500-year anniversary

a quincentennial

200

These tasty-sounding bits of info stored on a computer can help maintain a user's browser session

Cookies

200

Summoned up courage, or a hot dog condiment

Mustered/Mustard

200

Gaucho, Katy Lied, Can't Buy a Thrill

Steely Dan

200

These units of heat weigh in at just over 4 joules; the ones counted by dieters are actually "kilo-" sized  

calorie

300

Adjective describing a game in the NCAA when a team from the Pac-12 plays a team from the Big Ten

non-conference

300

This bakery term was used as slang for American soldiers during WWI

Doughboys

300

A part of the foot, or what you hope an injured foot would do

Heel/Heal

300

Moving Pictures, A Farewell to Kings, Permanent Waves

Rush

300

As the name implies, redox is a reaction in which these 2 actions take place

Reduction and Oxidation

400

Someone between 90 & 100 years of age

The event where Mary found out the Holy Spirit was going to help her conceive

400

This former name of the Hawaiian Islands sounds glutenous, but fret not

Sandwich Islands
400

An adhesive, or to walk back and forth

Paste/Paced

400

All Eyez On Me, Me Against the World, Better Dayz

Tupac

400

Europium is one of these metals, though they're not as scarce as their name implies

Rare Earth Metals

500

The event where Mary found out the Holy Spirit was going to help her conceive

the Annunciation

500

This flawed logic is named for its twisted nature & numerous holes

Pretzel Logic

500

A plundered bounty, or a mideval string instrument

Loot/Lute

500

Disintegration, Three Imaginary Boys, Seventeen Seconds

The Cure

500

Though it doesn't start with that letter, "S" represents this measure of the molecular disorder in a closed system

Entropy