Elements
Molecules
Reactions
Wild Card (Easy)
Wild Card (Hard)
100

This element has atomic number 1.

What is hydrogen?

100

This compound is known as the "universal solvent".

What is water?

100

The reaction between hydrogen and oxygen produces this product.

What is water?

100

Which of the following elements is a conductor?
Lithium, radon, or silicon

What is lithium?

100

If the chemical β-carotene appears orange, it must absorb this color of light most strongly.

What is blue?

200

This element is the third-lightest noble gas.

What is argon?

200

A molecule that donates protons.

What is a (Brønsted–Lowry) acid?

200

A reaction of the form A + B -> AB.

What is a synthesis reaction?

200

This analytical technique uses electric and magnetic fields to analyze the mass/charge ratio of ions.

What is mass spectroscopy?

200
Does caesium or lithium have a lower melting point?

What is caesium?

300

The most common form of this element is a red solid - it is commonly found on matchboxes.

What is phosphorus?

300

The number of atoms in one molecule of ozone.

What is three?

300

The reaction between an Arrhenius acid and base produces these two products.

What are a salt and water?

300

This element has atomic number 94.

What is plutonium?

300
Is liquid oxygen diamagnetic or paramagnetic?

What is paramagnetic?

400

This element's two most common isotopes have atomic weights 235 and 238.

What is uranium?

400

The hybridization of the carbon atoms in acetylene (C2H2).

What is sp?

400

The reaction between iron (iii) oxide and aluminium, commonly used for welding and in incendiary devices.

What is the thermite reaction?

400

The product of the Haber-Bosch process.

What is ammonia?

400
Out of boron, carbon, and aluminium, which would be expected to have the 1s peak on their respective photoelectron spectrums located at the highest energy?

What is aluminium?

500

This rare earth metal is used in the manufacture of very strong permanent magnets.

What is neodymium?

500

The bond order between the nitrogen and oxygen atoms in the nitrate ion.

What is 4/3?

500

Batteries are powered by this type of reaction.

What is an oxidation-reduction reaction?

500

Which of the following is not some shade of yellow?
Caesium, rubidium, octasulfur, or fluorine

What is rubidium?

500

The minimum energy required to remove an electron from a metal's surface is referred to by this term.

What is the metal's work function?