Recrystallization lab organic chemistry

Can you please help me answer this

Draw another microscopic sketch of a small section of stream with the charged comb nearby. In your sketch, draw at least 2 layers of at least 10 water molecules. Show the polarization orientation of each water molecule in the stream of water when the charged comb is nearby. What is the distinct feature of the orientation of each molecule’s polarity in this second situation?

A hydrated salt is one in which water molecules are suspended in the crystal lattice structure of the salt. Upon heating what happens to these water molecules? What change can be expected in the structure and appearance of the salt?

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. chemical symbol, chemical formula or Lewis structure substance boiling point A Cr (Choose one) H Н— С —Н :N-O –H (Choose one) v Н — С — Н H Ar (Choose one) v H H Н— С — С — О — С — Н (Choose one) v H H H

What are the effects of impurities on the boiling and melting points of a compound?

Carbon dioxide (CO2) and methane (CH4) exists as gaseous substances at room temperature. But dry ice is solid while liquefied natural gas (LNG) is liquid. Discuss the bonding pattern among the molecules of dry ice and LNG. cite references used

Look at the structure of a soap molecule, and explain what happened when you added soap to your oily hands and put your hands under the water for the solubility lab. Why could you wash the oil off your hands with soap and water? You should use chemistry concepts including structure, polarity, and intermolecular forces to explain your answer. attached is the lewis structure of a basic soap molecule. There are covalent bonds between all carbons, hydrogens, and oxygens. However, there is an ionic bond between oxygen and sodium ions.

Aspirin has a higher molar mass compared to salicylic acid, however aspirin melts at a lower temperature than salicylic acid. Provide a brief explanation for this observation. Table 1 Compound: Formula: Salicylic Acid C;H6O3 Aspirin C9H3O4 Molar Mass: 138.12 Melting point: Ka 158-160°C 1.08 x 10³ 180.15 140-142°C 2.72 x 10$ pKa Solubility (g/100ML) 2.99 4.57 0.18 0.25

Please answer the following questions in your own words.   Define the following terms:   Ion –    Valence electrons –   Atomic number –   Electronegativity –   Octet rule –   Explain the difference between a covalent, ionic, and hydrogen bond.     Compare and contrast polar and nonpolar covalent bonding. Identify 1 similarity and 1 difference.     Answer the following questions about water (H20):   Which type of chemical bond holds the hydrogen and oxygen atoms together in a single water molecule?   Which type of chemical bond holds different water molecules together in a water droplet?   Is water an example of a polar or nonpolar molecule? Explain.   Which atom in a water molecule has a greater electronegativity?   Will water dissolve nonpolar molecules? Explain.     Explain how the following properties of water are important to living organisms:   Water has a high heat of vaporization   Water is a good solvent   Ice is less dense than liquid water

For each compound in the table below, decide whether there would be any hydrogen-bonding force between molecules of the compound, or between molecules of the compound and molecules of water. compound hydrogen-bonding force Between Between molecules of formula or Lewis the compound and molecules of water? name molecules of the structure compound? H :0: yes yes acetic acid н —с —с-о —н | no no H H yes yes methanimine H – c=N– H no no yes yes hydrogen bromide H Br no no

Based on the information in the table below answer the following questions Element Atomic radius (nm) Crystal structure Electronegativity Valance Cu 0.1278 FCC 1.9 +2 0.071 0.046 0.060 Ag 0.1445 FCC 1.9 +1 Al 0.1431 FCC 1.5 +3 Co 0.1253 НСР 1.8 +2 Cr 0.1249 ВСС 1.6 +3 Fe 0.1241 ВСС 1.8 +2 Ni 0.1246 FCC 1.8 +2 Pd 0.1376 FCC 2.2 +2 Pt 0.1387 FCC 2.2 +2 Zn 0.1332 HCP 1.6 +2 (c) Which of those elements in the table would form an interstitial solid solution with copper without introducing lattice strain? (d) Which of these elements would be a solute for Cu that would have the highest solubility?

11. Hydrogen chloride is a compound. a. Draw a diagram to show how the electrons are arranged in a molecule of hydrogen chloride. Show only the outer electrons. Show hydrogen electrons as (circles) Show chlorine electrons as (x) b. State the name of the type of bonding present in hydrogen chloride._ c. Hydrogen chloride dissolves in water to form an acidic solution (hydrochloric acid). Describe how you would use litmus paper to show that this solution is acidic. d. Which one of the following values is most likely to represent the pH of a dilute solution of hydrochloric acid? Circle the correct answer pH2 pH7 pH10 f. Name the salt formed in this reaction. pH14 e. Complete the following equation for the reaction of hydrochloric acid with magnesium. Mg(s) + HCl(aq) → MgCl₂(aq) + H₂(g)

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. chemical symbol, chemical formula or Lewis structure substance boiling point A H, (Choose one) v HgCl, (Choose one) ♥ B HCl (Choose one) v D Н— О О — Н (Choose one) ♥ (Choose one) 1 (highest) 2 3 4 (lowest)

Br 3) a) Write the chemical formula for each compound. b) Order the compounds from lowest to highest boiling point and explain your reasoning in great detail. Use the concept of London dispersion forces to rationalize your answer clearly explaining what such forces are.

what is the difference between bonding forces holding compounds together and other attractive forces?

TRUE OR FALSE All atoms play a role in the physicochemical and pharmacologic properties of a molecule. Sophistication and advancement in technology are the main driving forces of drug development. Organic medicinal chemistry is the study of matter, specifically, all carbon-containing compounds. A functional group will always have the same physicochemical properties, regardless of its neighboring atoms in a molecular structure. Addition of a single methyl group in a drug molecule may result to changes in physical, chemical, pharmacokinetic, and pharmacologic properties. Steric effects occur when bulky and large functional groups are near each other in a molecular structure. Molecules that are highly capable of hydrogen bonding tend to be more soluble in nonpolar solvents.

1. Describe the appearance of the drops of water, ethyl alcohol, and kerosene on wax paper. 2. Do blade float on the surface of the water, ethyl alcohol and kerosene? Write your observations.

Consider the resonance structures of formate. Y-Y > H. Select the true statements about the resonance structures. Each carbon-oxygen bond is somewhere between a single and double bond. Each oxygen atom has a double bond 50% of the time. The actual structure of formate is an average of the two resonance forms. The actual structure of formate switches back and forth between the two resonance forms.

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