CHEMICAL REACTIONS (Redox, acid/base, descriptions)
INTERMOLECULAR FORCES
PERIODIC TRENDS
STOICHIOMETRY
RANDOM
100

Write the dissociation reaction of HCl(aq)

HCl(aq) ---> H+(aq) + Cl-(aq)

OR

HCl(aq) ---> H3O+(aq) + Cl-(aq)

100

Rank the intermolecular forces from weakest to strongest

1. London Dispersion Forces

2. Dipole-Dipole Forces

3. Hydrogen Bonding

4. Ionic Bonding

100

What is the most electronegative element?

Fluorine (F)

------------------------------------------------

Electronegativity increases from left to right and bottom to top on the periodic table.

100

CaCl2(aq) ---> Ca2+(aq) + 2Cl-(aq)

According to the equation, how many moles of chlorine ion will be produced from 5.7 moles of CaCl2?

11 moles Cl-

---------------------------------------------------------

[5.7 mol CaCl2(aq)] x [(2 mol Cl-(aq))/(1 mol CaCl2)]

= 11.4 moles Cl=~ 11 moles Cl-

100

_Al + _H2SO---> _Al2(SO4)3 + _H2

Balance the equation

2Al + 3H2SO---> 1Al2(SO4)3 + 6H2

(2, 3, 1, 6)

200

Sn2+ + 2Hg2+ ---> Hg2+ + Sn4+

According to the equation, which species is being oxidized?

Tin (Sn)

------------------------------------------------------

Oxidation is loss of electrons and gain of charge 

Sn2+ -> Sn4+

Sn loses two electrons

200

What intermolecular force do all covalent compounds have?

London Dispersion Forces

200

What charge do group 2 elements have?

2+

200

Pb(NO3)2(aq) + NaCl(aq) ---> PbCl2(s) + NaNO3(aq)

According the the equation, how many moles of NaCl are needed to produce 350g of PbCl2?

1.26 mol NaCl

------------------------------------------------------------

[350g PbCl2] x [(1 mol PbCl2)/(278.1g PbCl2)] x [(1 mol NaCl)/(1 mol PbCl2)] =~ 1.26 mol NaCl

200

CuCl2(aq) + F2(g) ---> CuF2(aq) + Cl2(g)

Write the oxidation and reduction reactions for the given equation.

Oxidation: 2Cl-(aq) ---> Cl20(g) + 2e-

Reduction: 2e- + F20(g) ---> 2F-(aq)

--------------------------------------------------------

Cu2+(aq) + 2Cl-(aq) + F20(g) ---> Cu2+(aq) + 2F-(aq) + Cl20(g)

Cu2+ is a spectator ion

2Cl-(aq) ---> Cl20(g) + 2e-

2e- + F20(g) ---> 2F-(aq)


300

Write and balance the equation given the description:

Aluminium hydroxide and hydrochloric acid solutions produce aluminium chloride solution and liquid water.

Al(OH)3(aq) + 3HCl(aq) ---> AlCl3(aq) + 3H2O(l)

300

Identify all of the intermolecular forces in methane (CH4) and identify the strongest one.

London Dispersion Forces are the only and strongest forces in CH4

--------------------------------------------------------

Methane is a nonpolar molecule

300

What is the full electron configuration of phosphorus (P)?

1s22s22p63s23p3

300

Cu(s) + Ag2SO4(aq) ---> 2Ag(s) + CuSO4(aq)

According to the equation, how many grams of copper (Cu) are needed to produce 7.35 grams of silver (Ag)?

2.17g Cu

-------------------------------------------------------

[7.35g Ag] x [(1 mol Ag)]/(107.87g Ag)] x [(1 mol Cu)/(2 mol Ag)] x [(63.55g Cu)/(1 mol Cu)] =~2.17g

300

What is the molarity of a 100mL solution of 2.50M HCl if it is diluted to 500mL?

0.500M

------------------------------------------------

M1V1 = M2V2 ---> (M1V1)/(V2) = M2

[(2.50M)(100mL)]/(500mL) = 0.500M

400

Li(s) + NaCl(aq) ---> LiCl(aq) + Na(s)

Write the net ionic equation for the given equation.

Li0(s) + Na+(aq) ---> Li+(aq) + Na0(s)

--------------------------------------------------------

Li0(s) + Na+ Cl-(aq) ---> Li+ + Cl-(aq) + Na0(s)

Cl- is a spectator ion


400

Identify all of the intermolecular forces in lactic acid (C3H6O3) and identify the strongest one.



Hydrogen Bonding, Dipole-Dipole Forces, London Dispersion Forces. Hydrogen bonding is the strongest force.

-------------------------------------------------------

The molecule is polar and there is a bond between O and H

400

Which element does the following photoelectron spectrum represent?


Aluminium (Al)

1s22s22p63s23p6

400

C3H8(g) + 5O2(g) ---> 3CO2(g) + 4H2O(l)

According to the equation, how many mL of water will be produced from 21.70 moles of O2

(the density of water is 1g/ml)

312.8mL H2O

------------------------------------------------------------

[21.70 mol O2] x [(4 mol H2O)/(5 mol O2)] x [(18.016g H2O)/(1 mol H2O)] x [(1mL H2O)/(1g H2O)] =~312.8mL H2O

400

What are two chemical names of H2O?

Dihydrogen Monoxide 

Hydrogen Hydroxide (H-OH)

500

What is the difference between a strong and weak acid?

A strong acid completely dissociates. A weak acid partially dissociates.

-------------------------------------------------------

HNO3, a strong acid, will dissociate completely into H3O+ and NO3-

HNO2, a weak acid, will dissociate into H3Oand NO2-, but leave behind some HNO2

500

Identify the intermolecular forces in ammonia chloride (NH4Cl) and identify the strongest one.


Ionic bonding is the only and strongest force in NH4Cl

-----------------------------------------------------

NH4+ and Cl- are ions

500

What is the valence electron configuration of antimony (Sb)?

5s25p3

500

AgNO3(aq) + NaCl(aq) ---> AgCl(s) + NaNO3(aq)

According the the equation, how many mL of 1.50M AgNO3 solution is needed to produce 5.00g of AgCl(s)

23.3mL

-----------------------------------------------------------

[5.00g AgCl] x [(1 mol AgCl)/(143.32g AgCl)] x [(1 mol AgNO3)/(1 mol AgCl)] x [(1000mL)/(1.50 mol AgNO3)] =~ 23.3mL

500

Calculate the pH of a solution with [OH-] = 5.32 x 10-4

pH =~ 10.70

--Solution 1----------------------------------

pOH = -log[OH-] = -log(5.32 x 10-4) = 3.27

14 - pOH = pH ---> 14 - 3.27 = 10.73

--Solution 2----------------------------------

1 x 10-14 = [H+][OH-] ---> 1 x 10-14 / [OH-] = [H+]

1 x 10-14 / 5.32 x 10-4 = [H+] = 1.89 x 10-11

pH = -log[H+] = -log(1.89 x 10-11) = 10.72