Ch 5-2

2. Identify which two of the following substances will conduct electricity, and explain why. a. Aluminum Foil b. Sugar, C12H22O11, dissolved in water c. Potassium Hydroxide, KOH, dissolved in water

//Aluminum will conduct electricity because its a solid, flexable, and can stretch without breaking. This is the properties of a metallic bond that aluminum has and therefore can conduct electricity because metals such as copper (another mettalic bond) can. (is a metal) //Sugar is a ionic bond because hydrogen and carbon are opposite charges that formed sugar. When you dissolve ionic bonds in water they can conduct electriciry because the ions are free to move now. (all of them are nonmetals-which don't conduct electricity) //Potassium Hydroxide is an ionic bonded compound because it has oxygen and potassium that bonded together. Potassium is a positive charged ion and oxygen is negative therefore it's an ionic bond. When ionic bonds are dissolved in water they are able to conduct electricity because they are free to move. (has a metal so it must be able to conduct electricity)

ionic bond

//a bond formed by the attraction between oppositely charged ions // between a metal and a nonmetal (cation and anion)

metallic bond

//a bond formed by the attraction between positively charged metal ions and the electrons around them //give or gain electrons //between metals and metals

polyatomic ion

//an ion made of two or more atoms //many atom ions //covalent ion with a charge = polyatomic ion

4. Predict whether a silver coin can conduct electricity. What kind of bonds does Silver have?

A silver coin can conduct electricity because metals that are flexable and the atoms are packed close together form a metallic bond. Metallic bonds are known to be able to conduct electricity so therefore so can silver. For example: copper is a good conductor and is made up of a metallic bond.

5. Describe how it is possible for Calcium Hydroxide, Ca(OH)2, to have both ionic and covalent bonds.

Calcium Hydroxide can have both an ionic and covalent bond because it has oxygen in it. This suggests that it could be a polyatomic bond because some of them do contain oxygen. It also could have both because oxygen has a negative charge and hydrogen has a positive charge so that means that it could have an ionic bond but both calcium and hydrogen are positive so they could share electrons. //***OH is a covalent bond because they're both ninmetals and calcium with it is a metal so it has an ionic bond.

7. Analyze whether Dinitrogen Tetroxide, N2O4, has covalent or ionic bonds. Describe how you reached this conclusion.

Dinitrogen Teroxide has a covalent bond because both nitrogen and oxygen are nonmetals meaning that they both have a negative charge. Nonmetals are also commonly covalent bonds. Because the ions aren't oppositely charged it couldn't be a ionic bond so I knew it had to be a covalent bond based on the charge and that nonmetals are commonly bonded together in covalent bonds.

covalent bond

a bond formed when atoms share one or more pairs of electrons (all nonmetals)

1. Determine if the following compounds are likely to have ionic or covalent bonds. a. Magnesium Oxide, MgO b. Strontium Chloride, SrCl2 c. Ozone, O3 d. Methanol, CH3OH

a.ionic b.ionic c.covalent d.covalent