How does heat affect density? Many people do not realize why certain things or reactions happen. An example of this is why lava lamps work. The heat from the Alka Seltzer mixes the oil and food coloring in our lava lamps together that gives the lava lamp the effect has. For example, in Nelly’s and my case, the heat is the Alka Seltzer. The heat changes the density of the oil and the food coloring. This gives the oil and food coloring a chance to mix and make what appears to be “lava.”
The heat makes the molecules in the mixture expand and move slower than when they are in colder temperatures (source 1). The molecules are like people when it comes to how they react to heat and coldness. When the molecules are cold, they like to be very close to one another and the molecules move fast because they are “shivering” (source 2).This is just a one of many examples and comparisons that I am going make throughout this paper. Some of the examples will be very cheesy. I am going to give a warning. When the molecules are hot, they like to be far apart from one another (source 1). They even might start to sweat like humans, too. The molecules have some energy too, but the molecules just do not have as much energy when they are hot. They like to be lazy like many humans do in hot weather (source 1).
With the molecules being spread out when they are hot, there are less of the molecules in one sample, when a sample is pulled. With fewer molecules in a certain area, this causes that area to weigh less (source 1). By weighing less, that mixture is able to move easier through different substances. For example, by the oil being heated and the food coloring being in the oil and water, the oil and food coloring are both able to “mingle” with each other (source 2). This contributes to the substance resembling “lava” in the lava lamp. The oil starts off being heavier than the water in the bottle, so when heat is added, the oil and water are able to move together in sync. With the water and the oil mixing with each other, the food coloring moves with the water and oil (source 2).
When substances are cold or just the opposite of hot, they tend to be on the thicker than when hot.
Thermodynamics is essentially how heat energy transfers from one substance to another. In “Joe Science vs. the Water Heater,” the temperature of water in a water heater must be found without measuring the water directly from the water heater. This problem was translated to the lab by providing heated water, fish bowl thermometers, styrofoam cups, and all other instruments found in the lab. The thermometer only reaches 45 degrees celsius; therefore, thermodynamic equations need to be applied in order to find the original temperature of the hot water. We also had access to deionized water that was approximately room temperature.
heat will stay in the cup and can only escape by rising to the surface
As the temperature increases, the movements of molecules also increase. This is the kinetic theory. When the temperature is increased the particles gain more energy and therefore move around faster. This gives the particles more of a chance with other particles and with more force.
This picture was taken from Disney’s website, and this information from the movie was found in Professor Brainard’s notes. As the movie rightly states, flubber is a polymer. It is composed of many monomers, which are linked together by a catalyst (boron). These monomers are linked together with chemical bonds to form long chains. Flubber is made of 1,000 to 10,000 monomers linked together. Unlike what was mentioned, electricity is not needed; but stirring will definitely speed up the reaction. Temperature does not need to fluctuate for the chemical reaction to occur, although temperature will affect the elasticity of flubber. Varying the temperature does not make flubber a conductive polymer, because flubber has many metastable states and does not require temperature changes to complete the metastable sphere--- it already possesses both the properties of a solid and a liquid. Besides, hydrocarbons do not inhibit cooper pairs. Flubber can be readily made at room temperature(298K) by dissolving the catalyst in hot water(323K); the reaction would not work well at a relatively low temperature of 77K, which is the temperature of the pressure reactor (in the movie) where flubber was made .
Especially with big quantities of a substance, the melting point tends to be a range of values rather than just one value. This is because all the substance will not melt at once; it takes some time to melt at its estimated melting point. However, the hot plate will continue to increase the temperature, even when the substance is at its melting point. Thus, a more accurate range of temperatures will be acquired if the substance is heated slowly. 2.
The diagram shows particles that are not moving quickly. This means that the chance of these particles colliding and causing a chemical reaction is rather low. The temperature is obviously low too, as is the particles have little energy to move quickly. However, if heat were added. The particles would have more energy and move quicker and have a better chance of colliding with the other.
• An increase in the temperature of the system will increase the rate of reaction. Again, using the Maxwell-Boltzmann distribution diagram, we can see how the temperature affects the reaction rate by seeing that an increase in temperature increases the average amount of energy of the reacting particles, thus giving more particles sufficient energy to react.
If there is a large particle with a large surface area, and many small particles, the smaller particles have a higher chance of colliding with the larger particles. However, if there are small particles, and small particles of another compound, then the reaction rate would be slower, because the particles wouldn’t collide as easily as they would with particles of a bigger size. The third factor that affects collisions is the temperature. If there is a higher temperature, then the particles are able to move freer and faster, than they would if the temperature was lower. This means that the reaction rate would be faster, because the collisions of the particles are more frequent.
1. When the temperature is increased all the particles move quicker, therefore there are more collisions. 2. If the solution is made more concentrated there will be more particles of the reactant colliding between the water molecules which makes collisions between the reactants more likely. 3.
A normal glass is first pass into a hot furnace where it is been heated up to temperature of 650 degree Celsius. At this stage the glass become in molten form and increases the elasticity of it .
Objects that are not the same size but have the same surface area to volume ratios loose heat at the same rate. So a flask, with a volume of 200cm3 with a surface area of 160cm2 and a surface area to volume ratio of 1.25:1, will loose heat at the same rate as a similar flask of volume 625 and a surface area of 500 which also has a surface area to volume ratio of 1.25:1. However, generally when you increase the size of an object the surface area to volume ratio decreases so in this example it is very likely that the two flasks in question are different shapes.
The ingredients that will be included are: dish soap, 30% hydrogen peroxide, potassium iodide, and corn starch. Adding the cornstarch to the mixture has a chemical reaction to the hydrogen peroxide. It will have light and dark patches due to the uneven placement of the cornstarch; it will have an uneven reaction. Which will then make it appear “glowing”. The fourth experiment is very similar when it comes to the ingredients the only thing that changes is that we are no longer using potassium iodide but we are using yeast instead. Also, since yeast is being used, we are adding in fluorescent dye to it so we can shine a UV (ultraviolet) light on it to see the reaction occurring. Using the dye under a light helps us observe the reaction between the dye and cornstarch. I had to replace the potassium iodide with yeast for a slow reaction and also so it is possible to use the dye. In both of these experiments the reaction is a massive production of foam. The hydrogen peroxide will be decomposed into water and by the oxygen by the iodide and/or the yeast. A substance called catalyst speeds up the
When heat is applied to solid water, some hydrogen bonds get so much kinetic energy that
As discussed in class, submission of your solutions to this exam will indicate that you have not communicated with others concerning this exam. You may use reference texts and other information at your disposal. Do all problems separately on clean white standard 8.5” X 11” photocopier paper (no notebook paper or scratch paper). Write on only one side of the paper (I don’t do double sided). Staple the entire solution set in the upper left hand corner (no binders or clips). Don’t turn in pages where you have scratched out or erased excessively, re-write the pages cleanly and neatly. All problems are equally weighted. Assume we are working with “normal” pressures and temperatures with ideal gases unless noted otherwise. Make sure you list all assumptions that you use (symmetry, isotropy, binomial expansion, etc.).
Temperature has a large effect on particles. Heat makes particles energized causing them to spread out and bounce around. Inversely the cold causes particles to clump together and become denser. These changes greatly F magnetic the state of substances and can also influence the strength of magnetic fields. This is because it can alter the flow of electrons through the magnet.