S5P2 Students will explain the difference between a physical change and a chemical change.
a. Investigate physical
changes by separating mixtures and manipulating (cutting,
tearing, folding) paper to demonstrate examples of physical change.
b. Recognize that the changes in state of water (water vapor/steam, liquid, ice) are due to temperature differences and are examples of physical change.
Investigate the properties of a substance before, during, and after a
chemical reaction to find evidence of change.
1: Dissolving Salt
Description of Activity: This lesson will demonstrate to students that matter, such as salt, may seem to have disappeared when it is dissolved in water, but it is still there.
PLO: Students will learn that matter is neither created nor destroyed even though it may undergo change.
clear plastic cup, scale, table salt, plastic spoon for stirring, measuring spoon
ProceduresShow the class a glass of water and have them list its physical properties. Next show them some salt and have them list its properties. Pour approximately one tablespoon of table salt into the water and stir until all the salt has dissolved. Ask the class to describe the salt water. Say: “You can't see the salt; where did the salt go?” Have someone taste the salt water and describe how it tastes. Ask: “Where has the salt gone?” (It's still in the water; you can taste it.) Have the students suggest ways that could be used to get the salt back out of the water. Then have teams complete the Instructional Procedures below.
First students should explore the website Change is Cool! .
Cooperative teams of 3-5 should complete the following procedures:
Students will learn the definition of physical change and experiment with one by seperating mixtures.
2: Chemical Changes
of Activity: Students will conduct fours experiments to see the
different effects of chemical changes.
PLO: Students will be able to explore some examples of chemical changes.
Medicine dropper, vinegar, baking soda, hydrogen peroxide, clear plastic cup, apron, apple,
green food coloring, tooth pick, bleach, safety googles, knife
First students should explore the website Learn the definition of physical and chemical changes!.
Tell students that one way of describing the characteristics of a pure substance is by its chemical properties.
|Activity 3: Chemical versus Physical
|Description of Activity:
Students will conduct two experiments to see the difference between a
physical and a chemical change.
PLO: Students will learn the difference between a physical and chemical reaction.
Experiment 1: Ammonium nitrate, tap water, ziplock bag (sandwich size), graduated cylinder,safety goggles, gloves, apron
Experiment 2: Calcium chloride, baking soda, acid-base indicator, ziplock bags, spoons, graduated cylinders
First students should explore the website Physical verse Chemical Change.
Experiment 1: Instant Cold Pack
The process in making the cold pack is not a chemical reaction but merely the physical act of dissolving. When ammonium nitrate is dissolved in water, the process is endothermic, thus producing the cold pack.Product:
1. Weigh out 25 grams of ammonium nitrate directly into a one-quart size Ziplock plastic bag.
2. Using a graduated cylinder, measure out 50 mL of water.
3. Quickly, pour the water into the bag of ammonium nitrate, and seal the bag (try and remove excess air before sealing the bag.)
4. Gently squeeze the bag to mix the solid and water.
5. Let the students feel the bag. It becomes cold within seconds and will remain cold for about 20 minutes.
Experiment 2: Reaction in a Bag
Introduces students to a chemical reaction involving a color change, the formation of a gas and heat changes from hot to cold. The students can actually hold this chemical reaction in their hands to see and feel the reaction take place. The acid-base indicator will change colors (from basic to acidic). For example: phenol red solution goes from red to orange to yellow. Universal indicator solution starts out green and changes to pink. Cabbage juice, changes from blue-green to purple to pink. The plastic bag will also inflate due to the formation of carbon dioxide gas.
1. Place one spoonful of calcium chloride into a plastic sealable bag.
2. place 1 spoonful of sodium bicarbonate (BAKING SODA) into the bag. Seal the bag, shake it and see if a chemical reaction takes place.
3. measure 10 ml (or 2 teaspoons) of indicator solution. Carefully add it to the bag. Flatten the bag to remove the air and seal it.
4. Tilt the bag back-and-forth to wet all of the solid. Squeezing the bag may also help in wetting the solid. Be careful not to squeeze the bag too hard as it might break or open up.
5. observe the reaction. If the bag gets tight due to pressure, open the seal to release the pressure, then reseal it.
6. Answer the following:
b.) Did a noticeable reaction occur before the indicator solution was added?
c.) What color change did the indicator go through?
d.) Why does the bag inflate?
e.) Does the reaction get hot or cold initially?
f.) Does the reaction get hot or cold after 1 minute?
g.) What observations did you make that tell you a chemical reaction is taking place?
h.) Was this experiment a physical or chemical reaction?
Students will be able to explain the difference between a physical and chemical change. Students will be able to give an example of each.
Title of software program: Science Court
Published by:Tom Snyder Productions
|Introduce core science concepts and model good scientific practice with this fun and engaging series that mixes animated courtroom drama, hands-on science activities, and humor. As each case unfolds, students examine the facts and perform hands-on experiments to help them predict the verdict. By discussing their findings in groups and as a class, students are able to articulate and comprehend challenging science topics.|
|When using this program students should not encounter many problems because the software is designed for grades 4th - 6th.|
Title of software program: I Love Science!
Published by: Kids Click Software
|Three science-crazy characters, Mo Mentum, Al
Luminium and Rosie Gardener invite kids into their wierd science labs.
Each lab is packed with jokes, activities, games, experiments and lots
This CD is packed with over 100 science experiments, 1,000 science problems and 60 off-computer experiments, plus parent help and print-outs. Curricula for grades 2-5 are included.
With this amazing CD kids will discover astonishing facts and important principals. Science grades will go up, up, up.
anticipate problems with this software by thinking it is too easy
because of the characters names.
Title of software program: Encyclopedia of Science
Published by: Dorling Kindersley
|Dissolve the mysteries of chemical reactions, learn about the great thinkers and their amazing discoveries, and explore how science has advanced tremendously as each discovery becomes a building block for new breakthroughs. Using the innovative DK signature combination of clicking dials and gauges, twisting pipes, moving levers and switches, large spinning gyros, sliding panels, and crackling electrical currents, this program creates a living laboratory environment that students will want to explore.|
|Students may anticipate problems with the
software because of difficult questions. The software is designed for
3rd - 12th grade.
Title of software program: Microsoft Word
Published by: Microsoft
|This is a great software program for
students to have. It is useful in writing papers, reports, and letters.
It even has a spell check tool so students can turn in papers
with perfect spelling.
|I do not think students will anticipate any
problems with this software. It contains many beneficial tools.
Title of software program: Microsoft Powerpoint
Published by: Microsoft
|This is a great software program for
students because it allows them to create magnificent presentations.
They can let their imaginations run wild with colored slides, clip art
images, and funky fonts.
|Students may find it difficult at first to
learn how some of the tools work in this software program, but after
experimenting with it it will become easier.
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