Next, we determined the mass of the penny by placing it on a balance. The mass of the penny was 2.47 grams. Afterwards, we placed the penny in a beaker filled with 20 mL of 6 M HCl. In the end we put the beaker in the fume hood and allowed it to sit overnight. During day two of the penny lab, we removed the penny skin from the beaker using tweezers.
In the “Drops of Water on a Penny” lab, I used the pipette to place 30 drops of regular water on the penny. As I was placing the drops of water on the penny, the water began to form a bubble on the penny, sticking together tightly so that it had risen above the penny. This occurred because of the high surface tension water has due to its hydrogen bonding. On the other penny with the soapy water, I was only able to place 24. Soap is a surfactant to water by interfering the hydrogen bonding and decreasing the surface tension so that the water does not stick to each as well as would have.
Our hypothesis was partially correct, the property changing substances did have the weakest coherency with the lowest drop counts of 23(carbonated), and 14(soap), and pure water did have the strongest bond. What we also found was the the salt also dampened the liquid’s ability to hold onto a penny in large volumes, as all the different salts had a drop average of 24(28x2 & 16), five less than Tap water’s drop count (30). This led us to conclude that pure water has the strongest bond and that all foreign materials weaken the coherency of water. This evidence has led me to believe that similar substances are attracted and are more coherent towards themselves, in this case the water pieces get separated and generally less connected on a really small level due to the obstruction of foreign objects, this is why the different salts perform better than the huge air bubbles or the slippery properties of soap since the latter is more obstructive and the former dissolves with the water and blocks less. When studying a few other groups’ conclusions and data we did indeed find differences: some groups had differing data where a solution had better coherence than water itself which led to differing conclusions.
In this lab, the water molecules stick strongly together and
In conclusion, the dime was able to pull it off and hold more drops than the penny. My hypothesis was incorrect because, I thought the penny would hold more drops than the dime because the penny was bigger and I thought it would absorb more. But the dime held more. Preston and I even ran the tests or investigation three times for each coin. The one question I had was ,what if the penny was stacked 1 time and the dime was stacked one time,would it make a difference ?
Hana Phan Mrs Thomas Honors Chemistry P. 2 9-20-17 Chapter 2 Booknotes 2.1 What is matter? matter - anything that has mass or volume volume - the amount of space an object occupies mass - a measure of how difficult it is to change the object’s state of motion atoms - the basic unit of matter molecules - a neutral group of atoms held together by chemical bonds physical properties - properties that can be observed or measured without changing the composition of matter state - the condition of being a gas, liquid, solid, plasma, or neutron star chemical properties - properties that can be observed only when substances interact with one another Matter is anything that has mass or volume. Volume is the amount of space an object occupies while
On our paper we predicted the amount of pennies that could fit in the boat before it sank. We tested the boat in the water and added pennies one by one. We then calculated the mass of pennies that fit in the boat and the density of it. The purpose of this Lab was to make a boat that holds as many pennies as possible and understand how to calculate
They tested the scent alone, and mosquitoes were attracted to
Fry used the new adhesive on yellow scrap paper to test his application. He discovered that the adhesive allowed the note to stick strongly, but be removed cleanly. Someone had finally found a problem for the solution that Silver had discovered. 3
The “slime” tore apart when pulled hard and fast. The substance broke apart as the polymer chains were stretched. The substance when pulled slowly did stretch and did not break apart. Slime is a non-Newtonian fluid and therefore has a different viscosity depending on the amount of force applied to the slime. This explains why pulling with more force caused the slime to thicken then break and less force simply increased the surface area or was stretched.
Diffusion is the movement of particles from a higher concentration
Place the the beaker onto a hot plate that is on a low heat setting (about setting 3). Every 5 minutes for 20 minutes, measure the circumference of the balloon and record it in Data Table A. You can measure the circumference of the balloon by looping a piece of string around it then using a ruler to measure the string’s length. Record the data in the data
Title: THE BALLOON INFLATION REACTION Introduction: Chemistry is one thing that makes us understand and gives us reasons of why certain reactions gives certain results. In this experiment we will be illustrating the reaction between baking powder and vinegar and see what happens to the balloon that is attached to it. Hypothetically the reaction of the vinegar and baking powder will produce carbon dioxide which will inflate the balloon. If the more vinegar may happen that when more vinegar is added to the baking powder it may produce more carbon dioxide thus the balloons diameter increases.
Aroma is responsible for 90 percent of what we actually taste, these gases are released every time you drink, suck, or chew. The gas flows out of your mouth up into your nostrils, then hitting nerve cells called olfactory epithelium. Your brain then takes the signals from your olfactory epithelium, and your tastebuds then combines them. By combing these two signals your brain creates a flavor in your mouth, which allows you to decide whether you like it or not. Although flavors usually arise from a mixture of many different chemicals, a single compound can supply dominant aroma.
Its a tradition in Colombia, for people to light candles all over the streets and their houses during the night of December the 7th. The Day of the Little Candles (Dia de las velitas) lights up the cities at night. Streets, porches, windows, balconies, sidewalks and parks are filled with melting candles, which the wax is a nightmare to pick up the next day. This tradition is so popular schools even celebrate it.
