Take a look at your lab document - notice that the questions are similar for each station. Explain to students that we will again be working with Skill 5 of the Chemistry Unit Plan, "I can provide evidence to show if a reaction is a chemical or physical change.
It looked like water. In addition, students investigate the Law of Conservation of Mass as they look at how bonds are broken and formed in chemical reactions. The OH- ion causes the phenolphthalein to turn pinkish.
Add a couple of drops of phenolphthalein to see if any OH- ions were produced, which will change the phenolphthalein from clear to purplish. At that point quickly remove it from the alcohol stand using the tongs. Acid neutralizer works too. When silver nitrate gets onto the skin, then exposed to ultraviolet light the sunit will turn the skin black.
What do you see when the drops of silver nitrate contact the NaCl salt solution? If heat is absorbed, it feels cool. That's because acidic foods like fruits in the ingredients will react with the bicarbonate ion HCO3- to make water and carbon dioxide. Light the flame again and put the sandwich back onto the screen foil side down and wait longer.
So that reinforces the idea that is it a physical change because it is easily reversible. These are nitrile gloves that are hypoallergenic. Look for evidence that would suggest the dye is turning to vapor.
Do not rotate until indicated by the teacher. So where is the OH- coming from? If less or more, how do you explain the difference in mass? It's scientific literacy immersion!
That means there are more OH- ions present.Glencoe Publishing Virtual Physical and Chemical Changes. Mystery Powder Science Matters 1" Make a chart for physical and chemical properties. 4. Set the stage for a mystery investigation by explaining, “On the way to school the Complete the enlarged Mystery Powders lab paper to compile what each of the groups found.
Physical and Chemical Properties Lab (10% of grade based on professionality and neatness of report) Purpose: To describe the physical and chemical properties of matter based on the.
Lab #1 Measurement of Physical Properties and chemical (behavior) properties. Physical properties are those than can be studied without attempting to change the substance into a different substance, while chemical properties can only be studied while trying to change the.
LESSON Day 2: Evidence of Chemical Reactions Lab; LESSON Types of Reactions Elaborate/Evaluate. Is it chemical or physical? Add to Favorites. 15 teachers like this lesson. Print Lesson. Share.
Objective. SWBAT identify the difference between a chemical change and a physical change. I only look for completion because I want. Lab #1 Measurement of Physical Properties and chemical (behavior) properties.
Physical properties are those than can be studied without attempting to change the substance into a different substance, while chemical properties can only be studied while trying to change the.Download