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
Highlighted words are “Science Language Students Should Know and Use”