WELCOME

FEBRUARY 8, 2014

Presenters: Dr. Avila & Vertical Alignment Team

Lab: Copper Reactions This laboratory experiment focuses on the chemical transformations of copper metal through different types of chemical reactions. In this series of reactions, copper metal will be dissolved in nitric acid; reaction with sodium hydroxide will produce copper (II) hydroxide; heating will produce copper (II) oxide; and copper (II) ions will then be reduced with magnesium metal to produce copper metal again. Modifications to ensure a safe experience in the high school chemistry setting will be discussed. Lab & Demonstrations: Gas Laws A laboratory and several demonstrations related to the gas laws (Boyle’s Law, Charles’ Law, Gay-Lussac’s Law, and the ideal gas law) will be performed. We will explore the conceptual and mathematical relations between volume, pressure, temperature, and number of moles for an ideal gas.

Chemistry Vertical Alignment Staff Development Saturday, February 8, 2014

Agenda 7:30 am - 8:15 am Registration and Welcome by Dr. Saenz8:30 am - 10:00 am Lab: Copper Reactions 10:00 am - 11:30 am Lab & Demonstrations: Gas Laws11:30 am - 12:10 pm Lunch12:15 pm - 1:45 pm Lab: Copper Reactions1:45 pm - 3:15 pm Lab & Demonstrations: Gas Laws

CHEM TEKS

Complete the following table for the two experiments in Model 1

Variables Experiment A Experiment B

Independent Variable

Dependent Variable

Controlled Variable (s)

Gas Law:

Formula:

Cause: Expose aerosol can to a direct flame.

Effect:

Gas Law:

Formula:

Cause: Expose balloon filled with helium on a cold winter day

Effect:

Gas Law:

Formula:

Cause: Expose balloon filled with helium on a hot summer day

Effect:

Gas Law:

Formula:

Cause: Add more external pressure on an inflated balloon.

Effect:

Exploration C : Adding more gas

Provide a molecular level explanation for the increase in volume among the balloons in experiment C.

Gases in the Flexible Container

Exploration D: Heating the gas

Provide a molecular level explanation for the increase in volume among the balloons in experiment D.

Exploration E:Reducing External Pressure on the Gas

Provide a molecular level explanation for the increase in volume among the balloons in experiment E.

CHARLES’ LAW

BOYLE’S LAW

Hot Air BalloonConcepts to Investigate: Charles's Law, hot air balloons, buoyancy, density, temperature-volume relationships in gases, Archimedes' Principle

Questions: (1) How high did your balloon travel? How long did it stay aloft?(2) Will your balloon rise faster on a cool day or a warm day? Explain.(3) Why does the hot air balloon eventually fall back to earth? (4) Why does the density of the air in the balloon decrease as it is heated?