Makeup Test Week 4 (AP/IB Chemistry) Due Wednesday Aug. 28
1.
A 4.99 gram sample of a compound contains 1.52 grams of nitrogen atoms and 3.47 grams of oxygen atoms. The molar mass of the compound is between 90.0 g and 95.0 g. Determine the empirical and molecular formulas. Also, calculate the actual molar mass of this compound.
2.
A sample of o a compound is analyzed to be 7.19% phosphorus and 92.81% bromine. The molar mass of the compound is known to be 431g/mol, what is the molecular formula?
3.
Why are empirical formulas used for ionic compounds?
4.
Why are molecular formulas used for covalent compounds?
5.
What did Robert Millikan contribute to modern atomic theory?
6.
What did James Chadwick contribute to modern atomic theory?
7.
State and describe John Dalton’s model of the atom.
8.
State and describe JJ Thomson’s model of the atom.
9.
State and describe JJ Thomson’s experiment.
10.
State and describe Ernest Rutherford’s model of the atom.
11.
What was Ernest Rutherford’s experiment called?
12.
What are three observations and corresponding inferences that Rutherford gathered from his experiment?
13.
State and describe Bohr’s Model of the atom.
14.
State and describe the current model of the atom.
15.
The Morgan silver dollar has a mass of 26.73 g. By law, it was required to contain 90 percent silver, with the remainder being copper. (a) When the coin was minted in the late 1800s, silver was worth $1.18 per troy ounce (31.1g). At this price, what is the value of the silver in the Morgan silver dollar? (b) Today, silver sells for
$24.07 per troy ounce. How many Morgan silver dollars are required to obtain $100.00 worth of pure silver?

Makeup Test Week 4 (AP/IB Chemistry) Due Wednesday Aug. 28
1.
A 4.99 gram sample of a compound contains 1.52 grams of nitrogen atoms and 3.47 grams of oxygen atoms. The molar mass of the compound is between 90.0 g and 95.0 g. Determine the empirical and molecular formulas. Also, calculate the actual molar mass of this compound.
2.
A sample of o a compound is analyzed to be 7.19% phosphorus and 92.81% bromine. The molar mass of the compound is known to be 431g/mol, what is the molecular formula?
3.
Why are empirical formulas used for ionic compounds?
4.
Why are molecular formulas used for covalent compounds?
5.
What did Robert Millikan contribute to modern atomic theory?
6.
What did James Chadwick contribute to modern atomic theory?
7.
State and describe John Dalton’s model of the atom.
8.
State and describe JJ Thomson’s model of the atom.
9.
State and describe JJ Thomson’s experiment.
10.
State and describe Ernest Rutherford’s model of the atom.
11.
What was Ernest Rutherford’s experiment called?
12.
What are three observations and corresponding inferences that Rutherford gathered from his experiment?
13.
State and describe Bohr’s Model of the atom.
14.
State and describe the current model of the atom.
15.
The Morgan silver dollar has a mass of 26.73 g. By law, it was required to contain 90 percent silver, with the remainder being copper. (a) When the coin was minted in the late 1800s, silver was worth $1.18 per troy ounce (31.1g). At this price, what is the value of the silver in the Morgan silver dollar? (b) Today, silver sells for
$24.07 per troy ounce. How many Morgan silver dollars are required to obtain $100.00 worth of pure silver?