# ALEX Lesson Plan

## Changing Matter, Not Weight

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This lesson provided by:
 Author: Kathy Perkins System: Tuscaloosa City School: Tuscaloosa City Board Of Education The event this resource created for: ASTA
General Lesson Information
 Lesson Plan ID: 34772 Title: Changing Matter, Not Weight Overview/Annotation: Matter is not created nor destroyed; it simply changes from one form to another.  This law of conservation of mass challenges elementary students’ ideas about matter, because many children may think that matter is created or destroyed in a chemical reaction.  In this lesson, students will challenge their preconceptions about matter by experimenting with physical and chemical changes to determine that the total weight of the matter does not change. Students will use math to show that the total weight of matter is equal to the sum of the weight of its component parts, and they will graph this information to show that the weight of matter is conserved during physical and chemical changes.This lesson results from a collaboration between the Alabama State Department of Education and ASTA.
Associated Standards and Objectives
Content Standard(s):
 Science SC2015 (2015) Grade: 5 2 ) Investigate matter to provide mathematical evidence, including graphs, to show that regardless of the type of reaction (e.g., new substance forming due to dissolving or mixing) or change (e.g., phase change) that occurs when heating, cooling, or mixing substances, the total weight of the matter is conserved. Insight Unpacked Content Scientific And Engineering Practices:Using Mathematics and Computational ThinkingCrosscutting Concepts: Scale, Proportion, and QuantityDisciplinary Core Idea: Matter and Its InteractionsEvidence Of Student Attainment:Students: Measure and graph quantities to provide evidence that regardless of the type of change that occurs when heating, cooling, or mixing substances, the total weight of matter is conserved.Teacher Vocabulary:Quantitative measurements (mass, weight, standard unit) Physical quantities (weight, time, temperature, volume) Property changes Matter Reaction Heating Cooling Mixing Physical properties Conservation of matter GraphingKnowledge:Students know: The amount (weight) of matter is conserved when it changes form, even in transitions in which it seems to vanish. No matter what reaction or change in properties occurs, the total weight of the substances does not change. (Boundary: Mass and weight are not distinguished at this grade level.)Skills:Students are able to: Measure and graph the given quantities using standard units, including: the weight of substances before they are heated, cooled, or mixed and the weight of substances, including any new substances produced by a reaction, after they are heated, cooled, or mixed. Measure and/or calculate the difference between the total weight of the substances (using standard units) before and after they are heated, cooled, and/or mixed. Describe the changes in properties they observe during and/or after heating, cooling, or mixing substances. Use their measurements and calculations to describe that the total weights of the substances did not change, regardless of the reaction or changes in properties that were observed. Use measurements and descriptions of weight, as well as the assumption of consistent patterns in natural systems, to describe evidence to address scientific questions about the conservation of the amount of matter, including the idea that the total weight of matter is conserved after heating, cooling, or mixing substances.Understanding:Students understand that: Standard units are used to measure and describe physical quantities such as weight and can be used to demonstrate the conservation of the total weight of matter.AMSTI Resources:AMSTI Module: Matter and Interactions NAEP Framework NAEP Statement:: P4.1: Objects and substances have properties. Weight (mass) and volume are properties that can be measured using appropriate tools.* NAEP Statement:: P4.3: Matter exists in several different states; the most common states are solid, liquid, and gas. Each state of matter has unique properties. For instance, gases are easily compressed while solids and liquids are not. The shape of a solid is independent of its container; liquids and gases take the shape of their containers. NAEP Statement:: P4.6: One way to change matter from one state to another and back again is by heating and cooling. Alabama Alternate Achievement Standards AAS Standard: SCI.AAS.5.2- Recognize that regardless of the type of reaction (e.g., new substance forming due to dissolving or mixing) or change (e.g., phase change) that occurs when heating, cooling, or mixing substances, the total weight of the matter is conserved.

Local/National Standards:

Primary Learning Objective(s):

Students will draw conclusions based on evidence from investigations to support the conservation of weight of matter after a physical or chemical change.

Students will:

• Identify the parts in a system.
• Weigh objects using balances.
• Calculate the weight of a system by adding the weights of its component parts.
• Graph data.
• Draw conclusions based on evidence from their investigations that show that the total weight of a closed system does not change during a physical or chemical change.
Preparation Information
 Total Duration: Greater than 120 Minutes Materials and Resources: Teacher materials for introductory demonstration:papermatches or lightermetal bowlStudent materials needed for each group of 4 students:balance.  You may use bucket balances and gram weights or simple scales.  If gram weights are not available, you can use pennies as increments of weight measurement. A penny weighs 2.5 grams.Small (approx.. 10” square) piece of cardboardIce cube in a Ziploc bag (Students can reuse this bag of water later in the final part of the lesson.)One paper or plastic cup filled halfway with waterSugar packet10 – 12 linking cubes or Lego bricksEffervescent antacid tabletEmpty water bottleVinegarBaking sodaMeasuring cup or graduated cylindersTeaspoonFunnelBalloonGeneral classroom materials:chart paper or marker boardmarkerssquare sticky notes in two colors Technology Resources Needed: Optional: computers with access to Google Apps (Students may use Google Sheets to create graphs in the extension portion of the lesson; this requires students to have Gmail addresses.) Background/Preparation: Teachers should have a clear understanding of the law of conservation of mass and the difference between physical and chemical changes.
Procedures/Activities: