Chapter 7
Chapter 8
Chapter 9
100

The percent by mass of Bromine in phosphorus tribromide.

PBr3 Mass = 270.682g/mol

Br3 Mass = 239.7

Percent by mass = 88.56%

100

What is Heat? What is Work?

Heat: The transfer of Kinetic Energy 

Work: The transfer of energy from one form to another. 

100
The number of valence electrons in ICl4-.

What is 36 Valence Electrons. 

200
The amount of moles in 5.31 grams of Calcium. 
What is 0.132 mol Ca?
200

The amount of joules in 259.3 kilocalories. 

What is 1.085 x 106 Joules?

200
Write the lewis structure of N3- and determine the formal charge on the central atom.

Charge = +1

300

The amount of atoms in 2.0 grams of Oxygen Gas.

What is 7.5 x 1022 atoms O?

300

Gold has a specific heat of 0.39 J/g*c. How many calories of heat are required to raise the temperature of a 100.0g gold bar by 15.0 degrees celsius?

q = msT

q = 140cal

300

What is the electronic and molecular geometry of 

SH2?

Electronic Geometry: Tetrahedral

Molecular Geometry: Bent 

400

Solid Magnesium reacts with water to form aqueous magnesium hydroxide and hydrogen gas. What is the balanced formula, and how many grams of water must react to form 6.03 moles of hydrogen gas?

Mg(s) + 2H2O(l) -> MgOH2(aq) + H2(g)

217 grams of H2O are needed. 

400

Sn(s) + 2Cl2(g) -> SnCl4(s)        Hrxn = -511.3kJ

If tin reacts with 19.72g of Chlorine gas, how much energy is released?

-71.11kJ

400

Determine if water is covalent or polar covalent. If polar covalent, does it have a net dipole?

Polar covalent, net dipole pointing in the Oxygen's direction. 
500

A reaction occurs with Magnesium Carbonate which produces Magnesium oxide and Carbon Dioxide. If we start with 5.25 grams of Magnesium Carbonate, what is the theoretical yield for Magnesium Oxide? We actually obtained 2.37 grams of MgO, what is the percent yield?

2.51 grams of MgO - Theoretical Yield

94.4% - Percent Yield 

500

A chemist conducts a calorimetry experiment on an unknown metal. The mass of the sample is 52.4g. The chemist heats the metal to 100.0 celsius, then places it in a coffee-cup calorimeter containing 95.4g of water. The temperature of the water rises from 21.9 to 23.2 celsius. What is the specific heat of the metal?

1. Find q for water = 5.2 x 102 J

2. Find q for metal = -5.2 x 102 J

3. Specific Heat metal = 0.13 J/g C

500

Determine if C2H2Cl2 is covalent or polar covalent. If polar covalent, does it have a net dipole? 

Polar covalent with a net dipole going in the direction of the Chlorine atoms. 
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