Chemical Glass Etching - Chemical or Physical Change?

School:: Palmetto Ridge High
Subject:: Science
Teacher:: Allison Chapman
Students Impacted:: 750
Grade:: 9-12
Date:: August 31, 2016

Investor

Thank you to the following investor for funding this grant.

License For Learning Plate Fund - $200.00

Impact to My Classroom

# of Students Impacted: 600

Students studied the difference between chemical and physical changes and watch a video demonstration of physical glass etching using sand blasting. Then they watched a short video on chemical glass etching, were provided with a handout, verbal and laminated instructions on lab safety and etching procedures in lab to chemical etch a candle votive.

They had to follow instructions, clean up, photograph their etched piece and then submit the photo in ANGEL along with a few sentences describing the lab and whether the technique they used was chemical or physical in nature.

Most students realized and wrote that a chemical reaction took place while they were etching the glass. I will try to attach a few examples below and send a sample to the Champions For Learning Office Building.

Thank you for your support for this laboratory and for other classroom grants.

Follow this link to find one example of glass etching. https://www.youtube.com/watch?v=tR_X8KxmTNA

Two students added joined the course late in the quarter after we had completed the glass etching laboratory but they stayed after one day to make bridal shower gifts for a family friend and they submitted this video for credit. bruh.MOV (3947646 bytes)

Original Grant Overview

Goal

Students will learn the difference between chemical and physical changes while studying chemical reactions and creating a memento to take home.

What will be done with my students

Students will watch a short video on the use of sand blasting to etch glass and then compare it to chemical glass etching.

They will then make or choose a stencil and an item to chemically etch (small glass or mirror).

Students will adhere the stencil on the glass surface they wish to etch and apply masking tape all around the stencil to protect the glass.

While wearing gloves and goggles, the students will carefully apply the etching compound and leave it on the surface for 1-2 minutes.

Finally the students will completely rinse the etching compound off their item and wash it and their hands.

Benefits to my students

Students will witness first hand the difference between physically and chemically etching glass. They will also have a piece of art to take home and be able to discuss the chemical process used to etch the design in the glass.

Budget Narrative

We have some of the materials to perform this lab experiment but need more etching compound ($70) and could use more reusable/custom stencils and equipment ($95). Students would be asked to bring in a small glass bottle to etch or we could provide something for them from Goodwill or The Dollar Store. Glass items there can be marked as low as fifty cents a piece when on sale ($100).

Items

#	Item	Cost
1	Glasses/Mirrors	$143.00
2	Etching Compound	$50.00
3	Reusable Stencils ($7 each)	$7.00
4	Exacto Knife to cut custom stencil designs	$0.00
5	Masking Tape	$0.00
	Total:	$200.00

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