Lab 2 Physical and Chemical Changes Student

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University of Arkansas, Fayetteville *

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3613

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Chemistry

Date

Dec 6, 2023

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docx

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Lab 2: Identifying Physical and Chemical Changes Attribution: “ Lab: Chemical and Physical Changes ” by Audrey Paul is licensed under CC BY-SA 4.0 / Modified procedure from original Background Every day of our lives, we are surrounded by chemical and physical changes. Rivers flow downstream causing erosion along the banks. Acid rain causes metal buildings to corrode. Scientists study the effects of these changes and find ways to prevent more damage from occurring. Usually a physical change will result in a change in state of matter, size or shape. There may also be a mixture formed. When a chemical change occurs, there may be fizzing/bubbling observed as a gas is formed. You may observe a change in color, odor or temperature. Light may be given off, ash may form or there may be a precipitate. A change in color such as painting a house is not a chemical change. In this lab, you will learn to recognize whether a physical or chemical change has occurred. In the provided data table, you will record observations that will help you decide which type of change has occurred. After analyzing your data, you will determine if there is evidence for a physical or chemical change. Remember that when a chemical change occurs, a new substance must be formed. Objectives Determine what type of change has occurred after performing each experiment. Materials Materials are listed in the attached document. Activities 1. Follow the instructions for each experiment. 2. Write down your observations. 3. Decide whether a physical or chemical change has occurred.

Lab 2 Data Sheet Experiment Number Observations Physical or Chemical Change? 1 It bubbled like sprite then began to calm down chemical 2 Melted into water physical 3 Turned into powder and crumbs Physical 4 Bubbled over the cup and fizzed up chemical 5 The cabbage turned blue and when the baking soda was added it kinda look like it absorbed the color chemical 6 The water changed into the koolaid color and it slowly dissolved physical 7 The penny became lighter as it sat in the ammonia Physical 8 Lit on fire and smoked once blown out chemical 9 Became multiple small pieces from one piece of paper physical 10 Fizzed up and got puffy chemical 11 Became more solid as it rolled it into a ball physical 12 Fizzed up then eventually dissolved chemical 13 The salt turned clear while the water turned foggy physical 14 The salt sat at the bottom of the cup, diddint really dissolve. physical 15 The milk got chunky chemical Analysis 1. Did you have difficulty classifying the type of change at any station? Indicate the specific station and why you had difficulty. 7 and 5, 7 because I feel like it coulve been chemical change but at the same time the form of the penny did not change, only the appearance, same thing with adding the cabbage juice to the baking with the baking soda, changed its physical form. 2. List three possible observations that indicated a chemical change has occurred. Bubbling, fizzing, rising 3. Was there an instance where a color change did not indicate a chemical change? Use an example to support your answer. The penny changed colors but it changed because it was cleaned 4. Give an example of a physical change and a chemical change that you observe in your daily life: Physical: taking iced water to work and watching the ice melt through the day Chemical: baking cakes and cupcakes

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