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100

How many electron bonds can carbon take?

4

100

What type of reaction is this?

Al(s) + 3AgNO3(aq) -> Al(NO3)3 + 3Ag(s)

Single displacement

100

What is the value of NA? (round to 3 decimal places)

6.022 x 1023

100

Define solute.

The substance being dissolved in a solvent

100

A substance has a high pOH (>10). Is it acidic, basic, or neutral?

Acidic

200

What is ionization energy?

The lowest amount of energy needed to remove an electron from an atom in the gaseous state

200

After burning acetylene gas in a test tube, you notice that the test tube gets coated with carbon soot. What type of reaction is this? Be specific.

Incomplete combustion

200

How do you calculate molar mass of an element?

It is the same as its atomic mass, but in g/mol.

200

You add water to an acid to make it less concentrated. What is this process called?

Dilution

200

Ammonia receives a proton in water to form ammonium hydroxide. What type of base is ammonia?(hint: named after an acid-base theory)

A Bronsted-Lowry base

300

Why does the atomic mass of an element have decimals in the periodic table?

It is the weighted average of all of its isotopes.

300

You put some copper metal in hydrochloric acid. Will it react? Explain why.

It will not react, because copper is below hydrogen on the activity series. It cannot displace hydrogen from acids. (except nitric acid)

300

Benzene (C6H6) and acetylene (C2H2) share a common formula of CH. What is this called?

The empirical formula

300

You have a 6 molar solution of sulfuric acid. What does this mean? Be specific.

There are 6 moles of H2SO4 per liter of that solution.

300

Does a supersaturated solution always have a precipitate that can be seen? Explain why.

Not necessarily. For example, a supersaturated solution of sugar water actually doesn't form sugar crystals unless it is disturbed by knocking it or dropping sugar crystals inside it.

400

Name all the scientists that contributed to the periodic table, and name their contributions.

Dobreiner - Dobreiner's Triads

Newlands - Newland's Octaves

Mendeleev - Mendeleev Periodic Table

Moseley - Modern Periodic Law

400

Write a balanced chemical equation for this reaction with state symbols:

An aqueous sodium phosphate solution is added to an aqueous solution of calcium nitrate.

2Na3PO4(aq) + 3Ca(NO3)2(aq) -> 6NaNO3(aq) + Ca3(PO4)2(s)

400

What is the mole ratio of sodium phosphate to sodium hydroxide when phosphoric acid is neutralized with sodium hydroxide?

H3PO4(aq) + 3NaOH(aq) -> Na3PO4(aq) + 3H2O(l)

The mole ratio is 1:3.

400

Is sodium chloride or table sugar (sucrose) more soluble in water? Explain why.

Sugar is more soluble in water due to its polar nature. Its OH bond allows hydrogen bonding in water. Sugar also has weaker intermolecular forces than sodium chloride, so the water molecules can break it apart more easily.

400

Helium atoms do not combine to form He2 molecules, but they still attract each other sometimes due to:

London dispersion forces

500

Nomenclature - Name these compounds.

1. Ba(OH)2 . H2O(s)

2. HClO4(aq)

3. P2O7(g)

4. Ca(H2PO4)2(s)

5. HBr(s)


1. Barium hydroxide monohydrate

2. Perchloric acid

3. Diphosphorus heptoxide

4. Calcium dihydrogen phosphate

5. Solid hydrogen bromide

500

Here are five chemical equations. Two of them are wrong. Identify them and explain the mistake.

1. 2Na(s) + 2H2O(l) -> 2NaOH(aq) + H2(g)

2. Mg(s) + O(g) -> MgO(s)

3. 2HCl(aq) + Ca(OH)2(aq) -> CaCl2(aq) + 2H2O(l)

4. Na2SO3(aq) + 2HCl(aq) -> 2NaCl(aq) + H2O(l) + SO2(g)

5. 3Cu(s) + 2Al(NO3)3(aq) -> 3Cu(NO3)2(aq) + 2Al(s)

Here are the mistakes:

Reaction 2: Oxygen is diatomic. It should be O2.

Reaction 5: Copper can't displace aluminum.

500

Ammonium chloride is an acidic salt. If 1 mol of aqueous ammonium chloride reacts with 1 mol of aqueous calcium hydroxide, how much of each product is formed (in moles)?

2NH4Cl(aq) + Ca(OH)2(aq) -> CaCl2(aq) + 2NH3(g) + 2H2O(l)

The products are: 1 mol of calcium chloride, 2 mol of ammonia gas, and 2 mol of water.

500

What does it mean when a salt is insoluble? Be specific.

An insoluble salt doesn't mean that it cannot dissolve in water at all. Instead, the term "insoluble" means that very little of that salt can be dissolved in water. For example, calcium hydroxide is slightly soluble in water, but is considered insoluble on the solubility table.

500

(Only learned briefly in class; will not be on tests or exams). Name all the strong acids.

(Hint: So I Brought No Perfectly Clean Clothes)

H2SO4, HI, HBr, HNO3, HClO4, HCl, HClO3

(HClO3 is a debatable one. It's not as strong as the other acids, so I will give the points even if it's not mentioned.)

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