What heat source did you use alcohol burner or candle? On the right is the color of the solution of sodium carbonate with some phenolphthalein indicator added.
I say, "So, how many of you agree that burning the paper will change it?? It is important that students connect that the products in a chemical reaction will have new chemical and physical properties than the reactants.
Then add 5 drops of Hydrochloric acid to it and feel the bottom of the tube. Dissolving one substance in another is also a physical change.
What did you see when the drops of silver nitrate contacted your tap water? Ask them to write 2 physical properties that were described in the first column and 2 chemical properties in the 2nd column.
Introduction and Connection to the NGSS and Common Core In this lesson, students go through a series of 12 quick lab stations in order to practice identifying reactions as chemical or physical changes. If so, then bubbles created by an acid is helping to confirm the sample is calcite.
Can we do that? I provide them this information before so they are better prepared to identify changes as they investigate different interactions of matter at each station.
Be sure to title the email "Lab 4". If the mass is more or less than it started with, how do you explain the difference in mass? Compare the appearance of the ribbon before and after burning.
Light the alcohol burner or light the candle if you are using that heat source. There is one form of silver staining that does not wear off. What is the source of the bubbles?
What is meant by "solid formation" or a "precipitate"?
Arrangement of particles When a physical change occurs, the particles e. Use a disposable pipette to mix them. Now how about the bubbles of carbon dioxide?
The required photos can either be attached to the email or inserted in the Word document if going that route. Connecting Vocabulary to Engage Activity After distinguishing these terms, I go back to the papers and ask them to think about the information about each kind of change we have discovered.
So these different meanings all revolve around the carbonate ion. So they need to be placed in sunlight for a few minutes. After reviewing, talk through with the students how to complete the chart as they complete the lab stations.
So use extra paper and the protective tile under the paper where you place the silver nitrate. Macroscopic patterns are related to the nature of microscopic and atomic-level structure.
Emphasize that they cannot choose "random" properties at each station. Is Epsom salts soluble in water? If the beaker is still hot, hot air will be felt coming up from the beaker.
They must pull the properties from the text! The solid that forms in a solution is called a precipitate. So where is the OH- coming from?
The photo on the left is claimed to be the first photo ever taken of a human face.oxygen gas and water is an example of a chemical property. In a physical change, only the temperature, size, or physical state of a sample of matter is altered.
The melting of ice and the evaporation of gasoline are examples of physical changes. In chemical changes, new substances, of different chemical composition, are produced. Examples of. Introduction to Physical and Chemical Changes. June 11, By Megan M. Rate this list: Activities for this list: Practice When you have finished this page, try the Chemical and Physical Changes Quiz There are several differences between a physical and chemical change in matter or substances.
View Lab Report - Observation of Physical and Chemical Changes Lab from CHEM at Trinity Valley Community College. Report Submitted: September 12, Title: Observations of Chemical and95%(41).
This Introduction to Physical and Chemical Changes Worksheet was designed for middle school students just learning about chemical and physical changes.
This double-sided worksheet features a helpful overview at the top, which students can refer4/5(). 4. In the third column, determine whether you feel the reaction you observed was a chemical reaction, physical reaction, or both.
5. In the last column "Evidence of a Chemical Change", if you choose physical reaction, there is no need to write anything. Physical Changes A physical change is when a substance changes, but remains the same substance. Change in size. If a piece of paper is cut into two pieces, the paper becomes smaller, but still remains as paper.
Change in shape. A tree is carved into a baseball bat.Download