Name: | Date: |

Graded Assignment

Semester Test, Part 2

Answer the questions below. When you have finished, submit this assignment to your teacher by the due date for full credit.

(5 points)

Score |

- What is Charles’s law?

- State the definition of the law in words.
- What are the assumptions of Charles’s law?
- Write mathematical equations that represent the law.
- What can be calculated with Charles’s law?
- Using a gas-filled balloon as an example, describe what happens to the gas molecules that behave according to Charles’s law.

Answer:

(5 points)

Score |

- Draw a structural formula for 3,4-hexene (C
_{6}H_{12}), which has a double bond between the number 3 and 4 carbons in the chain. What class of compound is it, and what feature distinguishes it as that class?

Answer:

(5 points)

Score |

- Besides the major types of radioactive decay, there are two others: positron emission and electron capture.

- Compare and contrast positrons with electrons.
- Explain how positron emission works and how it causes transmutations.
- Explain how electron capture works and how it causes transmutations.
- Compare the transmutations caused by positron emissions and electron capture.

Answer:

Score |

(5 points)

- A calorimeter contains 500 g of water at 25°C. You place a hand warmer containing 200 g of liquid sodium acetate inside the calorimeter. When the sodium acetate finishes crystallizing, the temperature of the water inside the calorimeter is 39.4°C. The specific heat of water is 4.18 J/g-°C. What is the enthalpy of fusion (
*H*_{f}) of the sodium acetate? (Show your work.) Where necessary, use*q*=*mH*_{f}.

Answer:

(5 points)

Score |

- Consider the dissociation of acetic acid in water at equilibrium:

CH_{3}COOH CH_{3}COO^{–} + H^{+}

You start with 0.05 moles of acetic acid in 500 mL of water. At equilibrium, the pH of the solution is 2.873. What is the equilibrium constant of this reaction? **Hint:** You will need to calculate an antilog using a scientific calculator.

Answer:

Your Score | ___ of 25 |