Recommended: Melting point of chocolate essay
Temperature: In this experiment, we will examine how the temperature affects the decomposition rate of a cough drop in water. There will be 3 different temperatures (cold, warm and hot) and all of the three experiment will be performed at the same time. Equipment: 3x Hot plates 3x Magnetic stirrers 3x 150 mL beakers 3x Cough drops 3x
Our objective was to pick the best chemical to be used in a hand warm. This chemical had to be cheap, relatively safe, and must raise the temperature by 20oC and no more. We add 6 different chemicals to water we record the inshell temperature and then add one a the 6 chemicals to the water and record the temperature change of the water. We also add cold water hot water together to find how much heat would escape the calorimeter. We found that the calorimeter absorbed 71.1J/oC. Then this information to calculate the energy that was released by all of the chemical reaction.
The control in the experiment is water. Units used while timing the productivity of gas from an Alka-Seltzer tablet in different temperatures is, seconds. In order to find out if temperature controls the rate of chemical reaction, whether hot water is a more effective way to make the gas produce at a faster speed, it would be necessary to compare the results of different temperatures at the end of each trial. In order to do this the scientists will measure the volume of gas that is produced within a 10 second interval time after the tablet begins to react.
Identify the independent Variable Size of the tablet Identify the dependent Variable Reaction time List the controlled variables The solution (water), temperature, volume of water (200 mls) The amount of Alka- Seltzer How will the dependent variables be measured A stop watch will be started as the pieces of Alka-Seltzer are dropped into 200ml of room temperture water Describe the expected results if the hypothesis is true The 3 smaller pieces of Alka Seltzer will dissolve quicker than the ½ tablet .
For two minutes, the metal was suspended in the boiling water. During the two minutes, a Styrofoam cup was filled with 100 mL of room temperature water. The initial temperature of the metal was equal to the temperature of the boiling water. In order to probably calculate the temperature of the metal, the steps were repeated and another temperature was
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.
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.
When making hot chocolate boiling water is used and is similar to the heat felt between them. “Tita was literally ‘like water for chocolate’—she was on the verge of boiling over. How irritable she was! Even the cooing she loved so much —the sound made by the doves she had reestablished under the roof of the house, a sound that had given her so much pleasure since her return—even that noise was annoying” “
The white candle burned faster because it has chemical materials in it. Result: The white candle burned slower than the coloured candle. The candles was 5.0cm before I burn it.
During my experiment I hope to find that out what drink will melt the ice the fastest. This can also make me question what is in that liquid that can melt ice quicker than water. When water is a different temperatures, the ice may melt more faster in the medium with the higher temperature.
The items that were massed were the evaporating dish, watch glass, and NaCO3. The materials were massed once before and once after being heated in the drying oven. The mass of the evaporating Dish before was 46.57 g; while after being heating was 60.15 g. The mass of the watch glass before was 57.97 g and after was 48.75g. There were two masses taken for the substance NaHCO3- one with the evaporating dish and one without, subtracted out after the lab was concluded. The mass of the substance with the dish was 48.79 g before and 62.33 g after; meanwhile, the mass of the substance without the dish was 2.22 g before and 2.18 g after. The mass of the NaHCO3 had changed after the reaction occurred along with after it was placed on the hot plate and being in the drying oven.
The independent variable tested in the lab was the type of Oreo cookie. The dependent variable in the lab was the mass of the stuffing in grams. Two control variables are the scale we used and the same brand of cookies. My hypothesis was if I measured the mass of the filling in the Double-Stuff and regular Oreos, then it would show that Double-Stuff Oreos do not have “double the stuff” because the mass of the Double-Stuff Oreo’s filling would be less than double the mass of a regular Oreo ’s filling.
Also, salt is an ionic compound and not a polar covalent compound, even though it did not melt last, due to the fact that the elements Na and Cl, both lose or gain an electron and then bond because of their opposite charges, which is a property only ionic bonds possess. The wax was the only substance whose results were synonymous with my hypothesis, since it required a low temperature for its melting point and was not soluble in water, both properties of nonpolar covalent compounds. Potential sources of error included not labeling the spots each substance was placed in the aluminum foil boat, seeing as the result for sugar seemed to be the correct conclusion for salt and vice versa. A future experiment would involve individually testing each substance in an aluminum foil boat, of the same brand, on a heat plate in order to avoid uncertainty. Each substance should be timed to record the precise time each substance began to melt or burn.
As the thought of gooey chocolate drizzling down, as he rips the warm cookie apart fills the baker’s mind, he has made up his mind on what to bake. The baker has numerous steps to take in a count to make the cookie. He has to gather the ingredients and mix or the process, bake the cookies, and serve the chocolate cookies when done. The first step the baker must take is the process which is gets the ingredients and supplies. The ingredients that the baker has to get is one stick of butter,
One person may classify the cross as no longer visible if they have a poorer eyesight or slower reaction time than another person. Therefore, the dependant variable might be affected. Make sure that the person who is recording when the X is no longer visible is always the person with the best eyesight and fastest reaction time. Temperature, when substances are left in room temperature. They change from the temperature of the container (which is not always room temperature) to room temperature.
