Questions On Chemistry

Submitted By willwill2

Words: 393

Pages: 2

Open Document

Summary and Analysis:
1. a. They are good electrical conductors. The white solids form colorless solutions. b. They are the same compound. Colors are the same.
2. The sugar does not dissociate into ions.
Solid state: hydrogen bonding in hydroxyl groups Dissolved state: hydrogen bonds are between the water molecules and the sugar molecule.

Solid state: www.chm.bris.ac.uk
Dissolved state: http://beyondpenguins.ehe.osu.edu/teaching-about-snowflakes-a-flurry-of-ideas-for-science-and-math-integration

The dissolving of sucrose is a physical change.

3. NaCl
Solid state: Dissolved state:

Solid state: http://www.chemistry.wustl.edu/~coursedev/Online%20tutorials/Solutions.htm Dissolved state: http://www.elmhurst.edu/~chm/vchembook/171solublesalts.html
Ionic attractions are overcome. This is a ambiguous change.

4. Yes, since both changes were physical, the compound is not changed.

5. The sucrose molecule does not dissociate into ions so the water molecules are surrounding the whole molecule. Sodium chloride dissolves in an aqueous solution so the water molecules are surrounding the individual ions, Na+ and Cl-. This explains the conductivity of sodium chloride in B.3.a. The ions of sodium chloride dissociate in solution and the freely moving ions conduct electricity. In sucrose, the molecule doesn’t dissociate into ions and therefore does not conduct electricity.

6. Ambiguous change. The ionic attractions are being overcome in the NaCl; however, the compound has not changed.

7. a. Co (H2O) 62+ the solution was more pink and then blue. b. dipole forces.

http://www.chemthes.com/entity_datapage.php?id=3985 c. The CoCl42- because the solution was blue violet. d. polar O-H bonds attracted to the ion.

Color and I 2 Ki Solution Essay

Exercise 3.1 Results 1. Random 2. No 3. No Discussion 1. Yes molecules are moving due to diffusion. 2. Because molecules are in constant motion it makes it easier for molecules to move. 3. Dfs Question: What is the permeability result of the I2KI solution? Hypothesis: The solution with H2O and I2KI will be more permeable than any other solution. Prediction: If the I2KI solution has not reducing sugar then the solution will turn blue. Table 3.1: Solution Source Original Contents Original…

Words 1546 - Pages 7

Chemistry Lab 6 Lab

Lab Six explored the solubility of a set of metal ionic compounds in water. This lab uses centrifugation, extraction , and observation to isolate each metal ionic compound and determine what metal is the product of the reactions. In this experiment both calculations and observations are used to determine the metal product of each reaction. During the experiment the precise measurement of 2 mL of unknown solution was mixed with and extraxted from the Sodium based solutions NaL, Na2s, and NaOH.From…

Words 381 - Pages 2

Essay on Chemistry: Hydrochloric Acid and Volumetric Flask

Laboratory 6 Solutions Instructions Now you are ready to begin a laboratory assignment. Remember to keep a careful and complete record of your laboratory activities in your Lab Notebook. Before beginning the activity, be sure to: • Read the entire laboratory assignment. • Complete the prelab quiz. Questions are provided in the analysis section of the laboratory activity. You are encouraged to discuss these questions with your fellow students in the Discussion Area for this…

Words 3243 - Pages 13

Lactase Enzyme Lab Report

Lactase Enzyme Lab This lab will examine the specificity of an enzyme (lactase) to a specific substrate (lactose). You and your lab partner will observe the actions of the enzyme and how shape is important to enzyme reactions. Lactose, the sugar found in milk, is a disaccharide composed of glucose and galactose (both six-sided sugars). Sucrose, ordinary table sugar, is also a disaccharide composed of fructose and glucose. Glucose is a six-sided sugar and fructose is a five-sided sugar. Lactase…

Words 569 - Pages 3

Irresistible Lab Report Chem 109 Essay

Abstract A buffer is a solution that resists changes in pH when H+, OH-, or H20 is added. By using standard lab equipment, a lab pro diagnostic tool, and acidic and basic solutions, the pH can be found. By recording the pH while adding a base or an acid gradually to a buffer solution you can find the capacity of each buffer to resist drastic changes in pH. The best buffers will keep a solution from becoming either too acidic or basic with the addition of a strong base or acid. Introduction The…

Words 1289 - Pages 6

Lab Report On Osmosis

Osmosis Lab Mikayla Clarke 10/2/16 Abstract: The purpose for the osmosis lab was to observe osmosis and determine the sucrose molarity of a potato and a carrot. This lab was separated into two different parts. In the first part of the lab, osmosis was observed by placing dialysis bags with various concentrations of sucrose into beakers of water. In the second part of the lab, the molar concentration of a potato and a carrot were determined by placing slices of potatoes and carrots…

Words 1625 - Pages 7

Colors: Solubility and Opaque Essay example

10/2/14 3B Micah Murphy Color of Chemistry Lab Introduction: Solubility refers to the ability for a given substance to dissolve in a solvent. The substance being dissolved is the solute, and the liquid it dissolves in is the solvent. Intermolecular forces, temperature, and pressure are some factors that affect solubility. The bonds of the solute must be broken in order for them to dissolve. A very polar solvent like water is needed to cause dissolution for an ionic solute. It is possible to predict…

Words 760 - Pages 4

The Things They Carried Essay

Brine Shrimp Lab Abstract: In our lab, we observed the adaptation of brine shrimp eggs when they are exposed to different salt concentrations. Brine shrimp are greatly influenced by environmental factors and their relatively short development time makes them great candidates for an experiment for observing adaptation. We tested populations of brine shrimp by exposing them to different concentrations of salt solution (NaCl). The lab was spaced out over three days and each day we collected data…

Words 1586 - Pages 7

Essay about Diffusion : Science

Lab Report Title : Diffusion through a membrane State Lab . Question : How does starch and glucose move through a membrane ? Hypothesis : Starch and glucose can move out of the cell Materials : Dialysis Tubing Dental Floss (Benedict's) Glucose Indicator Solution (Lugol's) Starch Indicator Solution (containing Iodine) Test Tube Rack 7 Test Tubes Tap Water Concentrated Glucose Solution Starch Solution DroppersIPipettes Beaker…

Words 2462 - Pages 10

Chemistry Lab 3 Essay

PRE LAB 1. Which type of compound usually has higher melting points: ionic compounds or covalent compounds? What is the reason for this difference in melting points? (3 points) Ionic compounds tend to have higher melting and boiling points than covalent compounds. This is because ionic compounds form ionic bonds, which are much stronger than covalent bonds, and thus are harder to break apart, by means of melting. 1 Do ionic compounds conduct electricity as: (3 points) 1. Solids? No, they do not…

Words 675 - Pages 3