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Summer School Chemistry Final Review
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How do chemists use balanced chemical equations?
To calculate amounts of reactants and products
What is the number of moles of solute in 250 mL of a 0.4M solution?
0.1 mol
A solution of AgNO3 contains 40.0 g AgNO3 per 100 mL of water. What is the solution's molarity?
2M
What is the molarity of a solution containing 400.0 g CuSO4 in 4.00 L of solution?
0.627M
How do you calculate the concentration of a solution in units of molarity?
Divide the number of moles of solute by the volume of the solution in liters.
What volume of 1.50M NaCl contains 3.40 moles of NaCl?
2.27 L
Which sample contains the most concentrated solution of hydrochloric acid (HCl)?
800 mL of 2.00M HCl
What is described by the expression 1.79M NaOH?
A solution of concentration 1.79 moles of NaOH per liter of water
How many moles of NaCl are in a 880-mL sample of 1.50M NaCl?
1.32 moles
Thea dissolves 0.33 mole of glucose into 450 mL of water. What is the concentration of the solution?
0.73M
A chemist prepares a solution of 0.150M acetic acid. What can be concluded about this solution?
The solution contains 0.150 mole of acetic acid for every 1.00 L of water.
A radioisotope has a half-life of 4 days. How much of a 20-gram sample of this radioisotope remains at the end of 8 days?
5 grams
How much of a sample of radioisotope remains after two half-lives?
one quarter after two half-lives
How much of a sample of radioisotope remains after one half-life?
Half after one half-life
How does alpha decay affect the mass number of a nucleus?
Decreases by 4
What part of an atom undergoes change during radioactive decay?
nucleus
Which nuclei most readily undergo nuclear fission?
Very large nuclei, such as those of uranium atoms and plutonium atoms
Which of these particles has the greatest mass?
 
Alpha particle
 
Beta particle
 
Positron
 
Proton
Which form of radiation, if any, has the greatest penetrating power, and generally is the most dangerous?
gamma radiation
How many moles are found in 3.33x10^23 molecules of carbon dioxide?
0.553
NH4CN
no
Is PbI2 soluble in water?
no
Is CaS soluble in water?
yes
Is AgCl soluble in water?
no
You conduct a laboratory investigation and produce 3.61 g of MgO. However, mathematically, you should have been able to produce 4.16 g. Calculate the percent yield.
86.8%
How many atoms are found in a 6.5 g sample of copper?
6.16x10^22 atoms
Calculate the molar mass of potassium chlorate, .
122.551g
________________ is a reaction that involves the breaking apart of the nucleus.
fission


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