FINAL EXAM CHEMISTRY 2017-1018

Kinetic-molecular theory makes several assumptions about ________________________

•  The size and energy of molecules.
• The motion and energy of molecules
•  The motion and size of molecules.
•  The size and weight of molecules.

One key point of the Kinetic Molecular Theory is ______________________________

•  ice freezes at 0ºC
•  atoms are solid billiard balls
• atoms possess an energy of motion
• molecules form solids

One key point of the Kinetic Molecular Theory is ______________________________

•  ice freezes at 0ºC
•  atoms are solid billiard balls
• atoms possess an energy of motion
• molecules form solids

Which of the following is true for all chemical reactions?

• The total mass of the products is greater than the total mass of the reactants.
• The total mass of the products decreases.
• The total mass of the reactants increases.
• The total mass of the reactants equals the total mass of the products.  

Which of the following is a valid difference between a mixture and a compound?

•  A compound is made up of more than one phase.
• A mixture can only be separated into its components by chemical means.
• A mixture must be uniform in composition.
• A compound can only be separated into its components by chemical means.

Under the same conditions of temperature and pressure, how many times faster will hydrogen effuse as compared to carbon dioxide?

• 4.67
• 5.67 
• 6.67 
• 7.67

The phase change that involves a solid substance turns to gas without passing the liquid state is called ___________________.

• Evaporation
• Condensation
• Sublimation
• Deposition

What did Rutherford’s gold foil experiment reveal?

• most of the atom is empty space 
• neutrinos exist 
• some atoms undergo radioactive decay 
• protons are negatively charged.

The initial temperature of a 1 liter sample of argon is at 20^oC. The pressure is decreased from 720 mmHg to 360 mmHg and the volume is increased to 2.14 liters. What is the change in temperature of the argon?

•  50^oC
• 40.5^oC
• 400^oK
• 10^oC

At what temperature would 2.1 moles of a nitrogen gas have a pressure of 1.25 atm in a 25 L tank?

• -92 ^oC
• 90 ^oC
• 280 ^oK
• 20 ^oC