Some theories of aging suggest that free radicals cause certain diseases and perhaps aging in general. As you know from the Lewis model, such molecules are not chemically stable and will quickly react with other molecules. According to some theories, free radicals may attack molecules within the cell, such as DNA, changing them and causing cancer or other diseases. Free radicals may also attack molecules on the surfaces of cells, making them appear foreign to the body’s immune system. The immune system then attacks the cells and destroys them, weakening the body. Draw Lewis structures for the free radicals implicated in this theory of aging, which are given here. a. O2 -b. O- c. OH d. CH3OO (unpaired electron on terminal oxygen)

Decide whether these proposed Lewis structures are reasonable. proposed Lewis structure HIH-O :0: || C1-C-C1: :5: :F=0=F: Is the proposed Lewis structure reasonable? Yes. O No, it has the wrong number of valence electrons. The correct number is: No, it has the right number of valence electrons but doesn't satisfy the octet rule. The symbols of the problem atoms are:* Yes. No, it has the wrong number of valence electrons. The correct number is: No, it has the right number of valence electrons but doesn't satisfy the octet rule.. The symbols of the problem atoms are:* Yes. No, it has the wrong number of valence electrons. The correct number is: No, it has the right number of valence electrons but doesn't satisfy the O octet rule. The symbols of the problem atoms are:* * If two or more atoms of the same element don't satisfy the octet rule, just enter the chemical symbol as many times as necessary. For example, if two oxygen atoms don't satisfy the octet rule, enter "0,0". X

Write the Lewis structure for the following covalent compounds: Start with the sum of valence electrons, then write the Lewis structure. Once the structure is complete write how many bonding pairs and how many lone pairs are in each structure. PC13 CS2 CBr4

Consider the Lewis structure of nitrogen molecule, N2. Count the number of bonding electrons in the structure.

Predicting the single-bonded molecular compounds formed by two elements.

Consider the SO 3 molecule. How many valence electrons does the molecule have?   How many lone pairs of electrons are on the central atom?   How many lone pairs of electrons in total are on the substituent atoms?   How many resonance structures can be drawn for the molecule?  If the ion doesn't exhibit resonance, indicate "1" as only one structure can be drawn for the molecule.

The table below includes the bond enthalpy (the energy required to separate the diatomic molecule into its atoms) and the bond length for each diatomic molecule. Diatomic Molecule Bond Enthalpy (kJ/mol) Bond Length (pm) Cl2 243 199 O2 498 121 N2 945 110   Identify the observed trend between bond enthalpy and number of shared electrons: as the number of electrons shared between two atoms increases, the bond enthalpy (  increases  /  decreases  /  remains unchanged  ).   Identify the observed trend between bond length and number of shared electrons: as the number of electrons shared between two atoms increases, the bond length (  increases  /  decreases  /  remains unchanged  ).

Decide whether these proposed Lewis structures are reasonable. proposed Lewis structure 10-C-6: C—0: :C=0: H-CIN Is the proposed Lewis structure reasonable? Yes. No, it has the wrong number of valence electrons. The correct number is: 0 No, it has the right number of valence electrons but doesn't satisfy the octet rule. The symbols of the problem atoms are:* Yes. No, it has the wrong number of valence electrons. The correct number is: No, it has the right number of valence electrons but doesn't satisfy the octet rule. The symbols of the problem atoms are:* 0 Yes. No, it has the wrong number of valence electrons. The correct number is: No, it has the right number of valence electrons but doesn't satisfy the octet rule. The symbols of the problem atoms are:* * If two or more atoms of the same element don't satisfy the octet rule, just enter the chemical symbol as many times as necessary. For example, if two oxygen atoms don't satisfy the octet rule, enter "O,0". X Ś

For the structure CIO3 draw a Lewis structure using Cl as the central atom... For the structure that obeys the octet rule which of the following are correct? There are a total of 26 valence electrons There are a total of 24 valence electrons There are a total of 25 valence electrons OCI has one lone pair of electrons CI makes a double bond to one of the oxygens Each O has a -1 formal charge 20 atoms make a double bond to Cl All 30 atoms make a double bond to Cl

Below is the Lewis structure of the nitrogen N2 molecule.  Count the number of bonding pairs and the number of lone pairs around the right nitrogen atom in this molecule.