Identify the bond type (van der Waals, hydrogen, ionic, covalent, metallic) present in the following samples: graphite, magnesium chloride, diphenylalanine, aluminum, argon, water, and methane. Note that there may be multiple bond types in a given sample.

The answer to your question is below

Explanation:

Van der waals are attractive forces among molecules.

Hydrogen are attractive forces among molecules that have polar molecules with hydrogen.

Ionic is the bond between a metal and a nonmetal.

Covalent is the bond between 2 nonmetals.

Metallic is the bond among metals

Question

Graphite                      covalent

Magnesium                 metallic

Chloride                       covalent, van der waals

Diphenylalanine          covalente, van der waals

Aluminum                     metallic

Argon                            van der waals

Water                            covalent, hydrogen

Methane.                      covalent  

                   Graphite —  covalent between C atoms in each layer

                                  —  van der Waals between adjacent layers

Magnesium chloride —  ionic

      Diphenylalanine —  ionic

                                   — covalent all C-C, C-H, C-N, and N-H bonds

                                   — H-bonding all N-H· · ·N in adjacent molecules

                                   —  van der Waals

                Aluminium —  Metallic

                       Argon —  van der Waals

                        Water —  covalent O-H bonds

                                   — H-bonding all O-H· · ·O in adjacent molecules

                                   —  van der Waals

                   Methane —  covalent C-H bonds

                                   —  van der Waals

Explanation:

Graphite is a network solid. It consists if C atoms in sheets of sheets of six-membered rings with only intermolecular forces between the sheets.

Magnesium chloride contains a metal and a nonmetal, so it is ionic.

Diphenylalanine, Ph₂CHCH(NH₂)COOH id an amino acid. It exists also as a zwitterion, Ph₂CHCH(NH₃⁺)COO⁻ .

Aluminium is a metal.

Argon is  noble gas.

Water is highly polar covalent.

Methane is nonpolar covalent. All covalent compounds that exist as separate molecules have London dispersion forces.

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.