Using Data from Quantitative Analysis, Identify Evidence That Supports the Conservation

Chemistry

STANDARD IV: Students will understand that in chemical reactions matter and energy change forms, but the amounts of matter and energy do not change.
Objective 2: Analyze evidence for the laws of conservation of mass and conservation of energy in chemical reactions.
Indicator / Main Ideas/ILOS / Learning Activities-Source

Using data from quantitative analysis, identify evidence that supports the conservation of mass in a chemical reaction.

Students should understand that the amount of matter as measured by mass, will not change in a chemical reaction as long as nothing is added or lost.
Precision of scientific instruments and error analysis are appropriate to discuss as part of this indicator.

MC test/Core Tracker
Lego Stoichiometry

Use molar relationships in a balanced chemical reaction to predict the mass of product produced in a simple chemical reaction that goes to completion.

Students should be able to convert molar quantities to atomic mass.
Students should be able to predict the mass of the products in a reaction.
Prepare students to understand equilibrium by emphasizing that reactions that go to completion are only one type of reaction and many reactions do not go to completion.

FAP-Formative Assessment Probe (Car Exhaust)
Serious Stoichiometry
S’mores

Report evidence of energy transformations in a chemical reaction.

Evidence of energy transformations may be observed as heat, light, sound or electrical changes.
Conservation of Energy is not addressed directly in the core.

After observing or measuring, classify evidence of temperature change in a chemical reaction as endothermic or exothermic.

Students should define exothermic as energy given off and endothermic as energy taken in during a chemical reaction.
Endothermic reactions absorb energy from their environment. Work must be done in order to get these reactions to occur. When endothermic reactions absorb energy, a temperature drop is measured during the reaction

Exo and Endothermic Reactions

Using either a constructed or a diagrammed electrochemical cell, describe how electrical energy can be produced in a chemical reaction

Students should be familiar with the concept ofhalf reaction and electron transfer as a source of electrical energy.

Reactions in a Battery
REDOX Lab

Using collected data, report the loss or gain of heat energy in a chemical reaction.

Students may experiment with exothermic or endothermic reactions.
To calculate heat, measurements of mass must be made. Heat can be expresses as calories or Joules.

Hot and Cold
Hotter All the Time

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