Lab 6 REPORT FORM_F22

In a post-lab question, a student was asked to explain heat curves. This is what they wrote:   "A heating curve shows how the temperature of a molecule changes as it is heated. First, it starts as a solid below its melting point. Then, as heat is put in, the bonds start to break at the phase change, and the molecule becomes a liquid. The temperature of the molecule cools slightly at this point. Then, the temperature rises again because the heat going in makes the molecules have greater potential energy (motion). At its boiling point, more bonds break and it turns into a gas. The phase changes are the flat regions of the heating curves because all the heat going in is used to break the bonds."   While they have a lot right, there are a number of mistakes. Highlight or copy-and-paste 2 errors, and explain what is wrong/how to fix the errors.

1. Draw the Lewis structure of a molecule of iodine. Is it polar or nonpolar? What intermolecular forces does it have? Draw the Lewis structure of n- decane (look in textbook). Is it polar or nonpolar? What intermolecular forces does it have? Draw the Lewis structure of isopropyl alcohol (page 665 or search on-line). Is it polar or nonpolar? What intermolecular forces does it have? 3. 2.

Look very closely at those images. Look at those lines and look at those electrons. Use the image attached to help.

Boron nitride is the second hardest substance known (next to diamond). It has a very high melting point but does not conduct electricity. What type(s) of bonding do you think is present in boron nitride? 1. There is covalent bonding within boron nitride molecules (BN), and London dispersion forces between the molecules. 2. There is a three dimensional network of metallic bonds between boron and nitrogen atoms. 3. There are covalent bonds between boron and nitrogen atoms which exist in a 3D network. 4. It is not possible to predict the type of bonding from a consideration of bulk properties. 5. There is covalent bonding within two-dimensional layers of alternating boron and nitrogen molecules, with London dispersion forces between the layers. O 5 O 3 0 1 02 04

Draw the electron distribution diagram for water. Begin with 1 central water molecule. Show the chemistry of each element within the central water molecule (all electron orbits, lone pair electrons, type of chemical bond, polarity/charge, and correct shape). What type of bond creates a water molecule? What type of bond holds 1 water molecule to another water molecule? Next, draw the correct number of other water molecules bonding to the central water molecule. How many other water molecules bond to a central molecule of water?

compound hydrogen-bonding force Between Between molecules of formula or Lewis molecules of the the compound and molecules of water? name structure compound? H H | Н — С | | yes yes N-chloromethylamine - no no H. yes yes hydrogen iodide HI no no :0: || н —с —с-о — н H yes yes acetic acid no no H O O

11. Complete the chart. **You should not have the same answer for all the IMF in the last column** Polarity of Molecular Formula Lewis Structure(1) Polarity of Molecule Justify your answer. What type of Intermolecular Forces exist in the molecule. Justify your Bond. Justify your answer. answer. 02 N2 H2O Between the H and the O NH3 Between the H and the N

CONCEPT MAPPING Marvin started a concept map to demonstrate the properties of water. He lost the map on campus, but luckily you found it. Save the day and complete his map. You'll notice that in the bottom left the document says "paste drawing here." As part of this task, you will be creating a drawing of a molecule of water. Be sure to label the molecule with the types of atoms and the charges that make this molecule polar. ?????

Explain, in molecular terms, why oil and water do not mix.

Please help me answer this questions

Rank the elements or compounds in the table below in decreasing order of their boiling points. That is, choose 1 next to the substance with the highest boiling point, choose 2 next to the substance with the next highest boiling point, and so on. substance A B C D chemical symbol, chemical formula or Lewis structure H-C=C-H H — He Fe -C=N: X boiling point (Choose one) (Choose one) O (Choose one) ŵ (Choose one) S

Match each item with the correct statement ¡¡¡· · · · What are bonds between molecules called? What is a property of polar molecules? What is a property of nonpolar molecules? What is the collective name for intermolecular bonding? What is the only force of attraction between noble gases? What dipole-dipole force between H and N, O, or F? results either What makes water a highly polar molecule? What force is responsible for holding polar molecules to one another? 1. 2. 3. intermolecular 4. 5. 6. 7. London dispersion polar covalent bonds and symmetrical structure hydrophobic 9. van der Waals forces hydrogen bond polar covalent bonds and asymmetrical structure 8. intramolecular hydrophilic 10. dipole-dipole

Complete the following table with needed information. Draw the 7 Lewis structures (structural formula). All bonded pairs must be shown with solid lines and all lone pairs with dots. Answer the questions after drawing your structure. If the molecule is polar, show the net dipole with appropriate arrow. See active Fig 9.30 in your book. Water is shown as an example here. Please do not show any calculations here, just the required information. Must show all lone pairs. H₂O CS₂ Ö Electron pair geometry: Tetrahedral Molecular Geometry: Bent Approximate bond angle: 109° Polar or nonpolar: Polar SiH₂O (hint: central atom is Si) Electron pair geometry: Molecular Geometry: Approximate bond angle: Polar or nonpolar: H₂Se Electron pair geometry: Molecular Geometry: Approximate bond angle: Polar or nonpolar: Electron pair geometry: Molecular Geometry: Approximate bond angle: Polar or nonpolar: NO3 Electron pair geometry: Molecular Geometry: Approximate bond angle: Polar or nonpolar: PF3 Electron…

This subject is physical science. Please answer the following questions.The second picture is the result Hope you can answer ,thankyou!

THIS is the equation N2H4 + O2 → N2 + H2O PLEASE HELP AND LOOK AT THE PICTURE FOR DATA  PLEASE HELP! I REALLY NEED HELP BECAUSE MY TEACHER HASENT TAUGHT ME HOW TO DO THIS PLEASE HELP!!!!!   Balance the equation (if not already balanced) Draw the models of the molecules in the equation, using Lewis structures, ball and stick models or something else that represents each of the atoms and how they are connected.  Identify bonds being formed or broken.  Use bond energy values from below to Calculate the overall energy of the reaction. Determine if the reaction is exothermic or endothermic. Draw a potential energy diagram showing the ∆H, reactants and products. Create one example of mass (g) to mass (g) stoichiometry problem.

A difference in _________ results in a polar bond between two atoms.

Please help answer part d and e

TRUE if the postulate is accurate and FALSE if the postulate is flawed.                                Postulates 3.Collisions between molecules are perfectly elastic (that is, no energy is gained nor lost during the                    collision).  4.There are negligible, attractive, or repulsive forces between molecules.  5.The average kinetic energy of a molecule is constant.

Consider a molecule I2CO, what would be the molecular geometry? Would you predict the molecule is polar or nonpolar?