Insert the stem of the pipette into the puddle and release the pressure of your fingers to suck all of the Na2S203 into the pipette. 14. Begin your stopwatch at zero time, holding it in your left hand to begin timing. 15. In your right hand hold the pipette with Na2S203 and squeeze the Na2S203 into well #1 and start timing with your stopwatch.
After the penny is finished reacting, using the tongs, remove the penny. 9. Wash off the penny in tap water carefully and thoroughly. You will be holding the pennies with your fingers and if you still have acid in or on them, it can be uncomfortable. 10.
3) Place the penny tails up 4) Place the pipette over the letter “c” in “one cent” 5) Place the pipette 5 inches above the penny 6) Begin to slowly squeeze the solution out of the pipette, over the letter “c” while counting the numbers of drops until the solution spills out from the surface of the penny. 7) Record data of how many drops of green mysterious solution could be held and the observations made. 8) When the solution spills out of the penny, dry off the penny. 9) Repeat steps 2-9 but over the Lincoln icon mark in the very center of the penny (be sure to use the same exact penny) The controlled conditions for this experiment included; a clean table surface, same penny, same person, and same pipette. The manipulated variable is where the person holding the pipette dropped the green mysterious solution on the “c” of “one cent” on the back or the very middle of the penny.
9. Wash off the penny in tap water carefully and thoroughly. You will be holding the pennies with your fingers and if you still have acid in or on them, it can be uncomfortable. 10. Dry off the penny carefully.
9. Draw blood into two microhematocrit tubes by capillary action avoiding air bubbles. The tubes should be filled about ¾ full and hold horizontally. 10. Wipe off excess blood from the capillary tube with a Kimwipe.
An ionic bond is the transfer of valence electrons between atoms. It is a type of chemical bond that creates two oppositely charged ions. In ionic bonds, the metal loses electrons to become a positively charged cation, the non-metal accepts those electrons to become a negatively charged anion. Ionic bonds require an electron donor, metal, and an electron acceptor, nonmetal. By losing those electrons, these metals can achieve noble-gas configuration and satisfy the octet rule.
Sometimes dipoles attract molecules that weren’t originally dipoles. When a dipole approaches a nonpolar molecule, the partial charges either attract or repel the electrons of the other particle. The electron cloud of the nonpolar molecule gets distorted be bulging away from the approaching dipole. This transforms the nonpolar molecule into a dipole. This new dipole is called an induce dipole.
2. Record initial pH using the pH paper. Use forceps to dip the small strip into the water and compare the color change to the standard color chart. 3. Add 0.1M HCl one drop at a time.
Purpose: To identify metal ions by the colors they produce in a flame. The colors and their energies are discussed in this unit. The color is produced by electrons being promoted and then relaxing to the ground state electronic structure. As the electrons move, energy is released and their energy is displayed as photons of light. Depending on the energy, a different color is released.
Make sure the rubber stopper is securely in place since gas can easily leak out. Collecting the gaseous product: Prepare the gas collection bottle by positioning the bottle so that its mouth is. directly over the hole at the bottom of the trough; this is where the gas will enter the bottle. After the reaction, slide a square of glass over the mouth of the bottle while the bottle is still under water. Keeping the glass fixed to the mouth, raise the collection bottle and invert.