Show:
Reactions and Stoichiometry
Electronic Structure and Periodicity
Thermochemistry
Bonding
Chemistry Pot-luck
100
A reaction that produces a gas is carried out in a sealed vessel on a balance. What happens to the mass the balance shows, as the reaction proceeds?
It does not change
100
How many unpaired electrons does a ground state N atom have?
3
100

The word characterizing a reaction that produces heat.

What is exothermic?

100

This type of bonding occurs in a sample of table salt.

What is Ionic bonding

100

The only letter of the alphabet that DOESN'T appear on the periodic table.

What is J? (or we will also accept Q, but it used to be there for Uuq, now Flerovium)

200
Which of these is a weak acid? C6H12O6, H2SO4, HNO3, HF, HClO4
HF
200

These orbitals are not available in elements in period 2 or period 1.

What are d orbitals?

200

If a reaction won't happen unless you stir it vigorously or apply a lot of heat to the reactants, it must be this.

What is endothermic?

200

This is an appropriate word to fill in the blank in the following sentence: Breaking bonds __________ energy

"takes", "requires", "needs"...

200

Apart from mercury, The only other element that is liquid at room temperature and atmospheric pressure.

What is Bromine?

300
What is the formula of the precipitate formed when ammonium sulfate solution reacts with strontium nitrate solution?
SrSO4
300

Out of Carbon, Silicon and Phosphorous: the one that has the highest electronegativity.

What is Carbon?

300

If this is positive, the products are at a higher energy level than the reactants.

What is the standard enthalpy of the reaction, or Delta Hrxn?

300

This is the number of electron pair domains around the oxygen atom in water

What is four?
300
Which form (allotrope) of oxygen is produced in lightening strikes?
Ozone (O3)
400
How many moles of oxygen gas are required to completely burn 4 moles of methanol (CH3OH)?
2CH3OH + 3O2 gives 2CO2 + 4H2O 6moles of O2 are required
400
Which of these elements has the lowest first ionization energy: Mg, Al, Si, P, B, C, N ?
Al (dip after Mg)
400

The enthalpy of a system increases during this type of process.

What is endothermic?

400

Of the following species, this is the one whose central atom has an "expanded octet" (more than 8 surrounding electrons): O3 (ozone), I3- (triiodide ion), SeCl2 (selenium dichloride), AsFl3 (arsenic trifluoride)

What is triiodide ion?

400

The color of Cu2+ ion in solution

What is Blue

500
What piece of glassware is used to make up an exact 1.000M solution of NaCl(aq)?
Volumetric flask
500

What is the correct explanation for why a sulfide ion has a larger radius than a sulfur atom?

Increased electron-electron repulsion (shielding) in the outer shell

500

The one of the following species that exhibits resonance: phosphorus pentachloride, phosphate ion, tetraphosporus decoxide, carbon monoxide

What is phosphate ion?

500

This is planck's constant to four significant figures, including order of magnitude (power of 10) and units.

What is 6.626 X 10-34 m2kg/s?