Physical Properties and Reactions of Period 3 Oxides

The students created a macroscopic, three-dimensional (3D) model of several properties of the periodic table. They explained in their own words the following terms: atomic radii, ionic radii, first ionization energy, and electronegativity. Lastly, they identified, described, and explained the patterns observed in the 3D periodic tables for the following element properties: atomic radii, ionic radii, first ionization energy, and electronegativity.

In the first place, high specific heat, electronegativity, and atomic mass are both periodic trends because no matter if go down or up a group or period the numbers will show a trend. The atomic mass is the weight of the atom in mass. Electronegativity is when two atom share electrons and high specific heat is an amount of heat needed to change the temperature of one gram of a substance. For example in atomic mass, going down the noble gas group shows that it is going from the lowest atomic mass to the highest atomic mass of that group. Also, if you go across the second row you can see that the mass increases. This demonstrates that the trend is periodic

In paragraph two, it states "Pure water contains very few ions, so it does not conduct electricity well. When table salt is dissolved in water, the solution conducts very well, because the solutions contain ions.". In paragraph four, it explains how laundry ammonia can conduct electricity. It states "When ammonia dissolves in water, it reacts with the water and forms a few ions.". In conclusion, paragraph five explains more about how ammonia can cause electricity when it is put into a solution with vinegar.

Sketch the electron dot structure for the following elements (ask about the easy way to find the valence electrons):

3. For Group 1A the oxidation number is +1 unless it is a free element.

Do ionic compounds conduct electricity as (3 points) Solids No Liquids Yes Aqueous solutions (when the ionic compounds are dissolved in water) Yes Do covalent compounds conduct electricity as (3 points) Solids no Liquids No Aqueous solutions (when the covalent compounds are dissolved in water) No Part I Lab Insert completed data tables for each part of the lab. Be sure that the data tables are organized and include units when necessary. Melting Point (4 points) Conductivity (4 points) Part II Conclusion Answer the following questions in your own words, using complete sentences. Based on your observations in the lab, categorize each unidentified compound as ionic or covalent. Explain in one or two sentences why you categorized the

c. All the formulas of the oxides formed by the alkaline earth metals and lead

In the last article "Conducting Solutions" the main purpose is that it explains how different materials conduct electricity. In this passage, they describe an experiment with sugar and water. It says that when sugar is dissolved in water, the solution does not conduct electricity because there are no ions in the solution. It also describes experiments with vinegar and ammonia. It says that they work well as a mixture because the ammonia reacts with the acid in vinegar and hey form a lot of

Due to these factors, this graduate student supplies a rating of ‘3’ concerning this element.

Metallics are also very good conductors of heat and electricity because the delocalized electrons are free to move, which supports the data claiming that Unknown 1 had very high conductivity as a solid and had a very high melting point. Also. metallics are malleable and when tested, Unknown 1 was able to change into the shape we had intended when hitting it. Unknown 2 was classified as a Non polar covalent bond based off the data. A property of a non polar covalent bond is that they do not form ions in water and therefore do not allow for conduction.

For the following molecules determine which atoms are bonded (write the symbols with a bond between them), the electronegativity difference between them, and the type of chemical bond it represents. If the bond is ionic, state what ions are produced. If the bond is polar covalent, indicate the direction of the dipole on the symbols from the first part.

Nonmetallic properties tend to predominate for elements at the far right portion of the table.

In this lab, students compared the periodic trends of the elements in comparison to the atomic number. A periodic trend is the tendency of certain properties of the elements to increase or decrease as one progresses along a row or column of the periodic table. The periodic table is arranged in such a way that these trends are easy to compare, which is the purpose of this lab. One trend, for example, is between the electronegativity and the atomic number on an element, another being the density. When comparing the trends, notice that electronegativity decreases when going down the groups, or columns, of the period table, whereas the density increases.

Semiconductors allow the flow of both ions and electrons through the sample but not completely free; and its

Solubility – Very soluble (water), Freely soluble (methylene chloride, chloroform, alcohol), Slightly soluble (acetone) and Insoluble (ether).6 Melting point - 120°C or 248°F.5