# ETEC 420- applications of engineering technology

ETEC 420- applications of engineering technology

## Module 2

Assignment 2:

1. What allows you to relate the mass and temperature of a molecule to its linear velocity?

• Van der Waals equation
• Kinetic velocity of gases
• Perfect gas law
• All of the above

Kinetic velocity of gases relate the mass and temperature with liner velocity.

2. Consider example 14.1 in your book. What is the ratio of the mass of a single molecule of the ideal gas in the example, to its (molecular velocity)2? Be sure that you’re using the correct units and to include R in your function. (Hint: Your answer should be m/u2 = ??)

3. Use your understanding of periodicity to determine the empirical formula for the following compounds:

• 10.1g Ca + 8.2g O + 0.554g H
• 3. 61.0 g C + 12.3 g H + 14.3 g N + 31.7 g O
• A 19.8241 g sample of a salt containing copper, nitrogen and oxygen. It contains 6.6209 g of nitrogen and 10.6998 g of oxygen. (Hint: begin by finding the grams of Copper in the solution)

Discussion 2:

In a Metathetical reaction, two species react to form two other species without oxidation or reduction.

For example: In an effort to form hydrogen (H2) gas in my laboratory at room temperature, I’m using Zinc with hydrochloric acid at room temperature to form soluble zinc chloride and hydrogen.

Zn + HCl = ZnCl2 + H2

In the above equation, as zinc displaces hydrogen from HCl, this a displacement reaction. Here the resulting reaction shows that two molecules of HCl are required to supply two atoms of Cl and ZnCl2 and two atoms of H for H2. To demonstrate this, I created the following balanced equation.

Zn + 2HCl = ZnCl2 + H2

Discuss

• Choose two species to react in a Metathetical reaction.
• Provide the complete, properly balanced, chemical equations for such a reaction and a step by step description of how you balanced the equation.
• Responses should address the following:
• Do you agree with the methodology used by the other student’s solutions?
• Do you have a faster or easier way to come to the same conclusion?
• Did you learn anything from the other students solution?
• Do you they have any suggestions?