Clean any dirty glassware before putting it in the drawer. The lid should pop up into the air several feet. As you can see from the image below, this student ranks has continually updated his level of mastery on each skill has his learning has developed. This means a chemical reaction is occurring and gasses are being produced. Has citric acid Pennies: 1.
Find the total molar mass of the following chemicals: a. Circle shape Sand paper: 1. The purpose of this exit slip is more than identifying the signs of a chemical change; it is in identifying physical and chemical properties that change as a result of chemical and physical reactions. Record your choice in the space provided. The yeast contains the enzyme catalase that decomposes hydrogen peroxide. It stresses group discussion, discourse and utilizing text references when engaging in argument.
If any contents are missing or broken, ask your lab instructor for replacement. This is because if you place the water first and then the acid, the reaction would take place and pose a safety hazard. If you are asked to name the main 4, 5 or 6 types of , here is how they are. Figure 1 Standard tests for 3 common gases. Sand down the pennies with sand paper and get rid of the copper; the pennies are now zinc 2. Each station is fun and allows students to get a real visualization of evidence that can predict a chemical change! At each lab station you must determine if the reaction observed is a chemical or physical reaction. This unit focuses on chemical properties and chemical reactions.
Has scratches on it Petri plate: 1. Complete and balance the following equations by predicting the products of each chemical reaction. What is the net ionic equation for any strong acid reacting with any strong base? Classifying chemical reactions helps chemists to predict the possible products that will form when two or more substances are mixed. The second reaction was more specifically a single replacement reaction, because one element was replaced in its compound by a more active element. No food or beverages of any kind should be brought in to the lab. Experimental Procedure Part A: Classifying Aqueous Reactions 1.
Write a balanced chemical equation for each reaction -8. Then, the student mentions that there was a temperature change but does not back it up with an observation from the lab or indicate that the temperature increased. There will be no credit given. Acquire a clean spot plate. For reaction 1, because it was a compound burning in the presence of oxygen, it was correctly named a combustion reaction. After plotting their point, the students list the things that they are still working on. If so, print the instructions onto a card for each station.
In Question 2, some students show that they are still having the misconception that phase changes and dissolving are physical changes and that when a new color appears, that would indicate a chemical change. She not only cites one piece of evidence as gas production, but she supports that evidence with a qualitative observation bubbles. Use this as evidence the same way a precipitate or other information would be used to classify reactions. Chemical reactions tend to involve the motion of , leading to the formation and breaking of. If it bursts back into flame, the test is positive. Also, wipe the bench with a sponge or wet towel and remove any refuse or equipment from the sink before you leave the lab room. When fire put in, thick white fog formed and flowed out, then downward.
Some students have the misconception that in a reaction there has to be more than one reactant that combines to form one or more than one product. Blow out the flame and try again! Bubbles will begin to rise to the top of the beaker. In other words, I split my classes into 10 groups. Then, they can share these examples with the class in a PowerPoint® presentation. Results Reaction Appearance of Reactant s , Evidence of Chemical Reaction and Properties of Product s 1 Manganese black and thin. Remember, when citing data, it is important to compare data points to demonstrate the change that occurred. Construct and revise an explanation for the outcome of a simple chemical reaction based on the outermost electron states of atoms, trends in the periodic table, and knowledge of the patterns of chemical properties.
Students have already read and gone through one lab series relating to these topics. The second question however, this student has some misconceptions. In addition, notice in the properties question, the student compares data she found from the text of the reactants to the products in order to provide evidence of the change. Include heat as a reactant or product. Which type of chemical reaction occurred in experiment 2? How might this pose a safety hazard? It's focus is scientific literacy. Never leave your experiment unattended and do not interrupt other workers. Aluminum metal and sulfuric acid yield aqueous aluminum sulfate and hydrogen gas.