Objective: To classify elements, compounds, and mixtures Introduction By now you know that any element can be seen represented on the periodic table. But what elements do you have contact with? In this investigative lab, you will explore elements, compounds, and mixtures that are a part of your everyday life. The purpose of this lab investigation is to distinguish between elements, compounds, and mixtures. However, we will also be practicing writing a hypothesis and preparing a lab report with the lab investigation rubric. Before you begin the lab, think about some elements, compounds, and mixtures that are familiar to you. You may be familiar with the elements oxygen and hydrogen even though you can ‘ t see them, they are all around in the air you breath. You know something is a compound when you can write a formula for it, such as table salt (NaCl). It is a mixture if it can be separated by physical means, such as cereal and milk or pepperoni pizza. Let’s explore these terms! Materials Needed At least 3 glass bowls or glasses An iron nail Some table salt Water A tea bag At least two of your own examples of elements, compounds and mixtures You lab notebook Lab investigation report template A digital camera (optional)* A pen or pencil ProceduresI 1. Make a hypothesis about the differences you will observe in elements, compounds, and mixtures. Be sure your hypothesis reflects what you learned in this lesson. You may state the hypothesis in terms of an “If….then” statement or a general statement. For example, “If a substance is a mixture, I will be able to separate out the different parts” of “If a substance is an element, I will find it on the Periodic Table.” If the substance is a mixture it will then be able to be separated from the different parts physically. If the substance is an element it then cannot be separated into a simpler substance.
If the substance is a compound it then can be separated from the different parts, but only chemically. 2. Be sure to complete the data tables in your lab investigation report and make observations as you perform the experiments. Before you begin the lab, be sure to open your lab investigation template so that you will be prepared to present your findings. The data table and observations will be included in the template.
- Spring '16
- Mr. Smyer
- Chemistry, Conclusion, Chemical substance, Chemical compound