Introduction The intent of this experiment is to understand how hot and cold water interact with each other by combining clear hot water and black ice cold water. I hope to learn more about how hot and cold water interact with each other. As of now, I know that cold water is denser than hot water. Knowing this I formed my hypothesis. Being, if hot and cold water were combined, then the cold water would move beneath the hot water because cold water is denser than hot water. Methods Materials: - Small glass bowl - Ice - Cold water - Food coloring - Spoon - Clear glass cup - Hot water - Clear medicine dropper Procedure: 1. First, in the glass bowl, mix the ice, cold water, and food coloring with the spoon 2. Next, fill the glass cup with hot water 3. Now, using the …show more content…
Did adding cold water on top produce a current? Adding the ice cold water on the top of the hot water produced a current that moved toward the bottom of the cup. 2. Did adding cold water to the bottom produce a current? Adding the ice cold water to the bottom of the hot water did not produce a current because the cold water did not move in a definite direction. Rather, it spread out on the bottom of the cup. 3. Define convection. Infer why the current that was created during this lab is called a convection current. Convection is the movement caused within a fluid when hotter, less dense water, moves upward, and colder, denser water, moves downward. I infer that the current that was created during this lab is called a convection current because the colder, denser water, moved beneath the hot water, causing the hot water to move upward. 4. How does this experiment demonstrate water density? This experiment demonstrated water density because the cold water moved beneath the hot water, because it is denser. 5. Was your hypothesis supported or refuted? Explain. My hypothesis was supported because what I hypothesized happened. If what I hypothesized did not happen, then my hypothesis would have been
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We were asked to correctly communicate these findings as we tested each of the substances she had encountered with both water and hexane. In experiment number three, The Relationship Between the Volume of a Gas and the Temperature, we where given a list of materials and asked to come up with our own procedure, which we did using zip lock bags filled with air, and submerged fully in a measured amount of water in order to find the volume, and then the change in volume when the temperature of the water was increased. In the fourth experiment we were asked to find the temperature of heated water, based on the cold and warm water. The experiment also required that each section be preformed several times in order to ensure accuracy, and also asked that the experimental responsibilities be split up between lab partners, each doing a section of the testing. This gave us an opportunity to work together with our fellow lab partners, with no one person doing the bulk of the work.
In addition, my hypothesis for this lab is the cornstarch and water will make a liquid-solid substance. The Investigating Mixtures Lab objective is to observe that not all liquids behave the same way when mixed with other liquids. Also, my hypothesis for this lab is the vegetable oil will not mix with the water. Conclusion/Analysis:
When the material heats up it rises and when it cools it sinks it is a repeating cycle. The hot water was less dense causing it to rise and it is less dense because the particles are beginning to spread out and not be close any longer. The cold water sinks because it’s more dense because the particles become close together and compacted they don’t move as much. Since the cold is more dense it
Explain?” The water has a higher density because the water is 1.00 g/cm3and the oil is is 0.92 g/cm3.The fifth question that was asked was, “Describe what you think will occur if droplets of soap was added to the mixture of water and vegetable oil? Why?” If we were to add droplets of soap to the mixture of the water and vegetable the outcome would change because soap has a different density than the other substances. The sixth question that was asked was, “Was the mixture a homogeneous or heterogeneous mixture?
Introduction: In this assignment, I will be doing two experimentations on examining the impact of temperature on the Alka-Seltzer’s response time. The first experimentation that I will be doing involves some water that is room temperature. The second experimentation that I will be doing involves some water that is very hot. If I want to be able to figure out the impact of the temperature on water, I will have to document the time it will take for the Alka-Seltzer to go into solution.
The water transmutation research explored the belief that “repeated and prolonged heating caused water to transmute into earth” (Cobb and Goldwhite 153), which came from the observation of when water evaporates, it leaves a water spot. Lavoisier decided to explore this theory by putting distilled water in a sealed glass and heated in for 101 days. When he weighed the sealed container, he found no change in weight from before it was heated. Then, he weighed the water and dry container separately after finding floating pieces of unknown material in the water and discovered that it was residue from the container walls. From this experiment, Lavoisier “refuted an established theory of alchemists and demonstrated that valid chemical theory must be experimentally verifiable” (Cobb and Goldwhite 153-154).
Then the scientist will observe the different rates of reaction with temperature. The Boltzmann distribution of law, indicates that high temperature makes molecules gain high energy contents (pubs.acs.org/doi/abs/10.1021/ja). In order to measure the reaction rate, the scientists must use the same volume of water at three different starting temperatures: hot tap
The temperature probe was then quickly cooled to room temperature. When this was achieved, the hot water was immediately transferred into the calorimeter. This method of keeping the temperature probe cooled before measuring a new temperature was repeated throughout the entire experiment. Temperature data was collected for 180 s while swirling the temperature inside the calorimeter. The calorimeter still contained the warm water.
a. Water boils to produce steam at 100 C (212 F) b. Water produces gas with sodium metal c. Water and oil separate when combined d. Water dissolves sugar 22. In the experiment, students put brine shrimp in water with different concentration of salt and counted the number. Which of the following changes to the experiment will increase confidence in the validity of the result? a. Count the number of dead brine shrimp instead of living brine shrimp b. Add more brine shrimp to the water with the highest salt concentration c.
Our original question was what is the effect of different types of water on an Alka Seltzer tablet? What we were measuring was which type of water will make the tablet dissolve the quickest. Our hypothesis was the salt water would dissolve it the fastest, then the pond the second, and tap would take the longest. The results ended up being that the tap water would dissolve the tablet the fastest, then the pond water, and the the salt last. Our three controls are the amount of salt, the amount of water, and the size of the tablet.
The science behind this is very simple, it involves the behavior of gases. Atoms in a gas is free flowing. They respond and move faster when there is heat, and slower when it is cooler because of a loss of energy. It then changes the pressure of the gas, as the atoms in a certain volume of gas changes. In this experiment, we heated to can with water in it until it was boiling, which
Water is a better conductor of heat than air. This explains why a potato cooks much faster in boiling water than in an oven, and why you cannot place your hand in boiling water at a temperature of 212 F (100 C), but can place your hand, at least very briefly, into a 400 F (200 C) oven. Generally, metals are good conductors, and gases and liquids are poor conductors. Conduction is a relatively slow method of heat transfer because there must be physical contact to transfer energy from one molecule to adjacent molecules. Consider what happens when a metal spoon is placed in a pot of simmering soup.
In this experiment, the amount of water lost in the 0.99 gram sample of hydrated salt was 0.35 grams, meaning that 35.4% of the salt’s mass was water. The unknown salt’s percent water is closest to that of Copper (II) Sulfate Pentahydrate, or CuSO4 ⋅ 5H2O. The percent error from the accepted percent water in CuSO4 ⋅ 5H2O is 1.67%, since the calculated value came out to be 0.6 less than the accepted value of 36.0%.This lab may have had some issues or sources of error, including the possibility of insufficient heating, meaning that some water may not have evaporated, that the scale was uncalibrated, or that the evaporating dish was still hot while being measured. This would have resulted in convection currents pushing up on the plate and making it seem lighter by lifting it up
II. METHODOLOGY In order to perform this experiment, the students will need a distillation set-up with a connector receiver, an iron ring and stand, a Bunsen burner, a wire gauze, a 250mL round bottom flask, a graduated cylinder, a thermometer, one or two boiling chips, an alcoholic beverage, masking tape, an ice bath, a stirring rod, and, optionally, food coloring. It is imporatnt to avoid playing with the apparatus and equipment so as to avoid breakage and injuries, especially since fire is being dealt with in this experiment.