Missing Mass - Unit Plan

In this unit, students will answer the question, how can a model rocket launch be used to create a model of chemical reactions and the Law of Conservation of Mass?

Students will classify chemical and physical changes, identify indicators that a chemical reaction has taken place and conduct an experiment that will allow them to see the Law of Conservation of Mass in a chemical reaction. Students will apply their analysis of these results to the decision of what data is necessary to collect from a model rocket launch that will support the Law of Conservation of Mass. They will apply that knowledge to the creation of a model that represents the Law of Conservation of Mass in a model rocket launch. Following the data collection during launch, students will compare results and apply those results to a classification of open and closed systems.

Throughout the unit, students will be creating and revising a model of the Law of Conservation of Mass, ultimately using that model to complete a Claim-Evidence-Reasoning paragraph that answers the Essential Question.

Next Generation Science Standards (NGSS)

MS-PS1-2

Analyze and interpret data on the properties of substances before and after the substances interact to determine if a chemical reaction has occurred.

MS-PS1-5

Develop and use a model to describe how the total number of atoms does not change in a chemical reaction and thus mass is conserved.

MS-ETS1-4

Develop a model to generate data for iterative testing and modification of a proposed object, tool, or process such that an optimal design can be achieved.

Science and Engineering Practices (SEP)

Asking and defining problems
Developing and using models
Planning and carrying out investigations
Analyzing and interpreting data
Engaging in argument from evidence

Cross Cutting Concepts (CCC)

Systems and system models

Energy and matter

Common Core Standards - ELA

CCSS.ELA-LITERACY.RST.6-8.3

Follow precisely a multistep procedure when carrying out experiments, taking measurements, or performing technical tasks.

CCSS.ELA-WRITING.6. W.1.c

Use words, phrases, and clauses to clarify the relationships among claim(s) and reasons.

CCSS.ELA-WRITING.7. W.2.d

Use precise language and domain-specific vocabulary to inform about or explain the topic.

Each Student Needs:

• Student Portfolio
• Safety Goggles
• Clipboard

The Class Needs:

• Chemical Reactions Slide Presentation
• Any Rocket Bulk Pack
• Engine Pack Corresponding to Rocket
• Lifetime Launch System
• Scales
• Balloons
• 50 mL Erlenmeyer Flasks
• 25 mL Graduated Cylinders
• Vinegar
• Baking Soda
• Small Cups
• Camera (optional)