Ionic bonds form between two atoms that have different electronegativity values.Because the ability to attract electrons is so different between the atoms, it's like one atom donates its electron to the other atom in the … Look up each ion in the solubility rules. The responses also allow me to see if there are any students who are missing the mark in terms of understanding. As it indicates conductivity, I ask my students why tap water conducts electricity.

"contaminated" testing vessel--either with previous unknown sample that conducts or with tap water remaining from washing, mixing of unknown samples (ex: some of #3 was inadvertently mixed in sample #2), disconnected battery from conductivity meter, Ionic compounds break up into individual ions when mixed in water, Ions are charged particles and can carry an electric charge, therefore conducting electricity. Lead chloride. TIP! CC BY-SA 3.0. http://en.wikipedia.org/w/index.php?title=File:Covalent_bond_hydrogen.svg&page=1

So the formula of the compound that results from reacting magnesium with bromine is: Using the crisscross rule.

While I take attendance, students do a warm-up activity in their composition Warm-Up/Reflection books. Most students had no problem drawing the conclusion that if a substance did conduct, then it was an ionic compound.

Students work in lab groups of about 6 to test small samples of each unknown. For example, here’s the compound made from the ammonium cation and the sulfide anion: Notice that because two ammonium ions (two positive charges) are needed to neutralize the two negative charges of the sulfide ion, the ammonium ion is enclosed in parentheses and a subscript 2 is added. 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. In this case, you divide each subscript by 2 and get the correct formula: Figuring the formula of magnesium bromide. It's been a while since I've looked at my Hubs, so I didn't realize that I missed a rule here. I show students how to use the conductivity meters that we have available. In this experiment you will carry out several tests to identify the cations and anions in ionic compounds. Hey phriot, I was just doing the quiz and ran into something that didn't make sense if we follow the rules you laid out. If a compound is made from two non-metals, its bonding will be covalent. Ionic, covalent (simple molecular and giant atomic), and metallic compounds all have different properties. This article has been viewed 496,646 times. Repeat for all the solid ionic compounds available, cleaning the wire loop each time. I found your hubs very interesting, useful and simple enough to substantiate my lessons. Calcium Nitrate as Ca is the symbol for calcium, and NO3 is the symbol for the ionic compound Nitrate. Investigate the reactions of carboxylic acids, Home Economics: Food and Nutrition (CCEA). Drop the last syllable of the anion and add “ide” instead. Identifying Unknown Compounds. octet ruleAtoms lose, gain, or share electrons in order to have a full valence level of eight electrons. By using our site, you agree to our.

iron) is one such example.

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