Chemistry Y11

IMF’S

100

What are the 3 types of intermolecular forces from weakest to strongest?

London Dispersion, dipole-dipole forces, hydrogen bonds. 

200

What type of intermolecular forces are due to the attraction between temporary dipoles and their induced temporary dipoles?

London Dispersion

300

In dispersion forces more electrons equal what?

more attraction to neighboring nuclei and stronger dispersion forces. 

400

Whats the difference between an intermolecular force and an intramolecular force?

Intramolecular forces are those within the molecule that keep the molecule together. Intermolecular forces are the attractions between molecules, which determine many of the physical properties of a substance.

500

Which of the following molecules have hydrogen bonding (there may be more than one answer)?

CH₄              NH₃               CH₃OH              CF₄

NH₃               CH₃OH

Ionic compounds

100

Which of the following are ionic compounds (there may be more than one answer)?

    KCl           CH₄          MgCl₂            H₂O₂

KCl               MgCl₂

200

What is the formula of aluminium carbonate?

Al₂(CO₃)₃

300

What is the formula of ammonium oxide?

(NH₄)₂O

400

If solutions of iron(II) bromide and sodium hydroxide are mixed, what will be the products  (words and chemical formulae) and will a precipitate be formed?

sodium bromide solution (NaBr (aq) )
iron(II) hydroxide precipitate (Fe(OH)₂ (s))

500

What are the full balanced and ionic equations for the following reaction (to write on the board):

lithium phosphate solution mixed with iron(III) nitrate solution

Li₃PO_{4 (aq)} + Fe(NO₃)_{3 (aq)} =>
3LiNO_{3 (aq)} + FePO_4 (s)

Solutions

100

What’s the difference between a heterogeneous mixture and a homogenous mixture?

Heterogenous not a definite or uniform composition. Homogenous is uniform composition. 

200

What are the 2 components of a solution?

Solvent (does the dissolving), and solute (the thing being dissolved)

300

Solubility (of solids) generally _____ with an increase in temperature.

Solubility (of gases) generally _____ with an increase in temperature.  

increases (solids)

decreases (gases)

400

What is the molarity formula?

moles of solute over Liters of solution

500

Determine the molarity of 125 grams of H₂SO₄ dissolved in 800 ml of water.

1.60 M H₂SO₄

Gas Laws

100

True or False: for gas law calculations, temperature is always converted to Kelvin. 

True

200

Why are gases easy to compress?

Because there is a lot of empty space, so it‘s easy to compress them. 

300

What are the 4 variables to describe gases used in the universal gas equation?

1. pressure (kPa,mmHg,atm)

2. volume (L or mL)

3. temperature (kelvin)

4. amount (moles)

400

If the temperature is constant, what change in the volume would cause the pressure of an enclosed gas to increase by a factor of 4?

1/4

500

What is the pressure of 0.33 moles of nitrogen gas, if its volume is 15.0 L at -25 degrees celsius?

3.5 atm, 44.97 kPa

Moles/Stoichiometry

100

Whats a limiting reactant?

the reactant that gets consumed first in a chemical reaction and therefore limits how much product can be formed.

200

How do you determine the percent composition (by mass) of elements in a compound?

1. Find the molar mass of all the elements in the compound in grams per mole.
2. Find the molecular mass of the entire compound.
3. Divide the component's molar mass by the entire molecular mass.
4. You will now have a number between 0 and 1. Multiply it by 100 to get percent composition!

300

What are the 4 steps to solving stoichiometry?

1. Write a balanced equation to represent the reaction.

2. Convert given quantities to moles.

3. Use molar ratio to find moles of unknown.

4. Convert found moles to unit needed

400

2KClO₃ —> 2KCl + 30₂

How many moles of oxygen are produced by the decomposition of six moles of potassium chlorate?

9 moles 0₂

500

Zn (s) + 2HCl (aq) —> ZnCl_{2 (aq)} + H_{2 (g)}

What volume of hydrogen at STP is produced when 2.5g of zinc react with an excess of hydrochloric acid?

0.86L H₂