Science Classroom Connection

We will complete our remaining discussion on the Laws of Definite and Multiple Proportions and reinforce this topic in terms of elements and compounds as well as apply these two laws through data analysis that is based upon masses of different substances.

Students are to read Section 3.4 in their textbooks and complete the reading guide in their Science Notebook pages 39-41. This section will focus upon the relationship between elements and compounds, how elements form compounds in a proportional manner, and how the same elements can result in different compounds through their masses. We will briefly overview the Periodic Table of the Elements prior to delving into it in details in the coming days and weeks!

After reviewing our results from our activity on physical and chemical changes, we will do another method of separating a mixture that is known as chromatography, whereby students will observe how a black, washable ink marker is capable of separating into its several color composition based on the affinity of the chromatography paper to the different components of the colors that make up the black, washable marker.

See the details of the lab activity that is listed under October 8th, 2012.

We will discuss, in detail, our lab activity that will focus upon the physical and chemical properties of matter as they influence changes in matter. For example, the students will observe and record what happens to salt water when silver nitrate is added to it; what happens when hydrogen chloride is slowly added to magnesium; what happens when a few crystals of copper (II) sulfate in the hydrated state is heated for a few minutes, then cooled, and a few drops of distilled water is added to it; and finally, what happens, in terms of  magnetism, to a mixture of powdered sulfur and iron filings before and after heating the mixture.