ALEX Classroom Resource

  

Conservation of Mass

  Classroom Resource Information  

Title:

 Conservation of Mass

URL:

 https://www.acs.org/content/acs/en/education/resources/k-8/inquiryinaction/fifth-grade/chapter-4/conservation-of-mass.html

Content Source:

 Other
American Chemical Society
Type: Lesson/Unit Plan

Overview:

In this lesson, students will be able to make measurements showing that whether the process is a change of state, dissolving, or a chemical reaction, the total mass of the substances does not change. Students check to see whether the mass of ice and water in a cup changes as the ice melts. Students also test whether the combined mass of sugar and water changes after sugar is dissolved in the water. As a demonstration, students will observe that a precipitate forms in a reaction between solutions of magnesium sulfate and sodium carbonate, and that the mass of the products is the same as the mass of the reactants.

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.

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.

Unpacked Content
Scientific And Engineering Practices:
Using Mathematics and Computational Thinking
Crosscutting Concepts: Scale, Proportion, and Quantity
Disciplinary Core Idea: Matter and Its Interactions
Evidence 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
  • Graphing
Knowledge:
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
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.
Tags: chemical reaction, dissolve, magnesium sulfate, mass, precipitate, reactants, sodium carbonate, solutions, substance
License Type: Custom Permission Type
See Terms: https://www.acs.org/content/acs/en/terms.html
For full descriptions of license types and a guide to usage, visit :
https://creativecommons.org/licenses
AccessibilityVideo resources: includes closed captioning or subtitles
Comments
  This resource provided by:  
Author: Stephanie Carver
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