Topic+5b

Topic 5b **__ Topic 5 Bond types __**  1. Adam L.  2. Bond types- A chemical bond is an attraction between atoms brought about by a sharing of electrons between two atoms or a complete transfer of electrons. There are three types of chemical bonds: Ionic, Covalent and Polar covalent. In addition chemists often recognize another type of bond called a hydrogen bond.  3. []  4. There are three types of chemical bonds. The first is a Ionic bond. Ionic bonds are made up of elements with a low electronegativity level that react with other elements with a high electronegativity level making a complete transfer of electrons. The second type is covalent bonds. Covalent bonds occur in elements with similar, partially filled outer levels of electrons, because if the atoms are similar in negativity they will share electrons. The third type of bond is a polar covalent bond. Polar covalent bonds are a mix of both ionic and covalent. They involve atoms with greatly different electronegativity values because even though they do share electrons, the electrons spend most of the time around a single atom in the compound versus being shared evenly.

1 matt d 2 a covalent bond would be water for instance, Hydrogen X2 + Oxygen= water, this is an example of a covalent bond [] 3 Another example would be table salt, sodium plus chlorine make sodium chloride which is an ionic bond. The result is table salt 4 []

Becky S.

Samantha K.
 * ** Element ** ||  || ** Electronegativity ** ||   || ||   || ** Bond ** ||   || ** Melting Point ** ||   || ** Conductivity ** ||


 * ** A ** ||  || 1.0 ||   || ||   || ** A-B ** ||   || NA ||   || NA ||


 * ** B ** ||  || 2.5 ||   || ||   || ** C-D ** ||   ||  -76 ℃  ||   || Poor ||


 * ** C ** ||  || NA ||   || ||   || ** B-D ** ||   ||  3373 ℃  ||   || Excellent ||


 * ** D ** ||  || NA ||   || ||   || ** D-D ** ||   ||  -270 ℃  ||   || NA ||

  ** Determine the bond type for bond CD. Show all work and/or explain your answer. ** 2.**Bond CD is Ionic. Element C has a high electronegativity which we can see from the conductivity level. Element D has a low electronegativity. **   ** Determine the bond type for bond BD. Show all work and/or explain your answer. ** 3.**Bond BD is polar covalent. B has high electronegativity and D has low electronegativity. **<span style="font-size: 9pt; line-height: 115%; font-family: 'Arial','sans-serif';"> <span style="font-size: 9pt; line-height: 115%; font-family: 'Calibri','sans-serif'; msobidifontfamily: Calibri; msobidithemefont: minor-latin; msolist: Ignore; msobidifontfamily: Calibri; msobidithemefont: minor-latin;"> <span style="font-size: 9pt; line-height: 115%; font-family: 'Calibri','sans-serif'; mso-bidi-font-family: 'Times New Roman'; mso-bidi-theme-font: minor-bidi; mso-ascii-theme-font: minor-latin; mso-hansi-theme-font: minor-latin;"> **<span style="font-size: 9pt; line-height: 115%; font-family: 'Calibri','sans-serif'; mso-bidi-font-family: Arial;"> Determine the bond type for bond DD. Show all work and/or explain your answer. ** 4.**<span style="font-weight: normal; font-size: 9pt; line-height: 115%; font-family: 'Calibri','sans-serif'; mso-bidi-font-family: Arial; mso-bidi-font-weight: bold;">Bond DD is Covalent. To have a covalent bond, the elements must have similar electronegativity levels, and since it is two of the same element, it is obvious that the levels are the same. **
 * <span style="font-size: 9pt; line-height: 115%; font-family: 'Calibri','sans-serif'; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">1. **<span style="font-size: 9pt; line-height: 115%; font-family: 'Calibri','sans-serif'; mso-bidi-font-family: 'Times New Roman'; mso-bidi-theme-font: minor-bidi; mso-ascii-theme-font: minor-latin; mso-hansi-theme-font: minor-latin;"> **<span style="font-size: 9pt; line-height: 115%; font-family: 'Calibri','sans-serif'; mso-bidi-font-family: Arial;">Determine the bond type for bond AB. Show all work and/or explain your answer. **
 * <span style="font-weight: normal; font-size: 9pt; line-height: 115%; font-family: 'Calibri','sans-serif'; mso-bidi-font-family: Arial; mso-bidi-font-weight: bold;">This bond is Polar Covalent. I know this because element A has a low level of electronegativity and B is significantly higher. The two different electron levels react to form a polar covalent bond. **<span style="font-size: 9pt; line-height: 115%; font-family: 'Arial','sans-serif';">