University:
Kentucky State University
Course:
CHE 101 | General Chemistry I
Academic year:

2024
Views:

182

Pages:

4
Author:

kundgetanufv

Chemical Bonding Fundamentals PRE-LAB QUESTIONS 1. List the atomic numbers for each of the following elements: a. Iron: 26 b. Calcium: 20 c. Potassium: 19 d. Oxygen: 8 e. Nitrogen: 7 f. Hydrogen: 1 2. What determines if a bond is polar? A bond is polar when the shared e- are closer to one of the bonded atoms, a bond is more polar the more electronegativity it has. 3. Use the periodic table to determine if potassium chloride (KCl) is formed through covalent or ionic bonds? Use evidence from the Introduction to support your answer. It is formed through ionic bonds; this can only happen with an electrical charge that attracts an atom or molecule of the opposite charge. Chemical Bonding Fundamentals 4. Research two common polar molecules and two common non-polar molecules. Draw their molecular structure and explain how the structure makes each molecule polar or non-polar. Chemical Bonding Fundamentals EXPERIMENT 1: SLIME TIME Result Tables Table 1: Results of Ink Testing for Slime Did not pick up Did not pick up Did not pick up Trial 1 Trial 2 Trial 3 uni-ball® Roller Pen No No No Permanent Marker No No No Dry Erase Marker No No No Did not pick up Did not pick up Did not pick up Trial 1 Trial 2 Trial 3 Highlighter No No No uni-ball® Roller Pen No No No Permanent Marker No No No Name of Ink Picked up Picked up Picked up (dissolved) (dissolved) (dissolved) Trial 1 Trial 2 Trial 3 Newsprint Yes Yes Yes Highlighter Yes Yes Yes Table 2: Results of Ink Testing for Silly Putty® Name of Ink Newsprint Dry Erase Marker Picked up Picked up Picked up (dissolved) (dissolved) (dissolved) Trial 1 Trial 2 Trial 3 Yes Yes Yes Yes Yes Yes Chemical Bonding Fundamentals Hypotheses and Observations Part 1  Slime Observations: Slime had no stretch to it, was very runny, and also ripped easily. Part 2  Hypothesis for Slime (Part 2, Step 3): I believe the slime will pick up the highlighter and dry erase marker.  Hypothesis for Silly Putty® (Part 2, Step 8): I believe the slime will pick up the dry erase marker. Part 3  Chromatography Observations: The highlighter was the only dot to move out of the four different inks. Post-Lab Questions 1. Did the slime pick up water soluble or water insoluble inks? From these results, what can you conclude about the polarity of slime molecules? The slime picked up only watersoluble inks. From these results we can conclude that slime is polar like water-soluble inks. 2. Explain how you determined your hypothesis regarding the ability of Silly Putty® to pick up water soluble inks. What scientific information did you incorporate to formulate the hypothesis? Was your hypothesis correct? For the silly putty it picked up some dry erase marker and also some of the newspaper ink, I just thought it would most likely pick up the newspaper ink because it so easily transferred for the dry erase marker I was a very faint pickup. 3. Were the inks you used properly classified as soluble and insoluble? Explain your answer. Yes, the inks were correctly classified. I was able to use two of each allowing me to further understand water soluble and insoluble.