Graph Conclusion: My hypothesis was correct. Step 4: Place the cup in the freezer overnight. Phase Change Lab Report by Dylan Norfolk Abstract: The purpose of this experiment is to study the energy changes associated with the phase changes of water. That mass is still in the room after it boils away, just floating around with the air molecules. Step 11: Heat the water until it evaporates. Heat is added to cause this phase change to occur. Evoke prior knowledge of making homemade ice cream and ice cream makers.
Students with Special Needs Each student should be able to participate in this activity. What is the relationship between the temperature and time during each phase change? If I took the beaker and placed it into the freezer immediately at the conclusion of this experiment, then I would see the following changes. The information, procedure, data table and analysis questions to be completed when data is finished being collected can all be found in the student lab sheet. Any response is valid here as long as students are engaged in the prompt and thinking about the possibilities. With proper lab equipment, it would be possible to collect the water vapor and weigh it again. It may take extreme temperature, pressure or energy, but all matter can be changed.
Sublimation occurs when dry ice turns into gas. When a liquid becomes a solid, heat is removed from a substance and it is known as freezing. I read the procedure in the elaborate section of the lab sheet along with the students, holding up the materials as we read them. We see the ice turn into water and the water boils and turns into steam. This leads to an interesting conversation about how boiling is a form of evaporation, and evaporation is a cooling event. For more lessons about phases of matter, please see my. The reason for this is explained by the pictures below.
Data Analysis What was the mass of the water before the ice was frozen? Hold the bag by its corners. The phase change that occurs is known as condensation and requires 2,260. The next group chooses a statement, and so on, until all of the statements have been placed correctly into the Venn diagram. Eventually, after what seems like forever if you are hungry, the water gets to its boiling point. This paper will basically outline the lab done in class and a way for the teacher to see what was learned from this lab.
We have worked with hot plates and thermometers in other labs before, so we know how to be safe. It was a special wax manufactured especially for the project by Shell. When a substance changes directly from a solid to a gas, it is known as sublimation. Using a red colored pencil, they can write in the phase changes, such as evaporation. If the statement is incorrectly placed into the diagram, the statement is returned to the list outside of the diagram.
So in liquids, bonds are forming and breaking all the time. This report has discussed the quantitative and qualitative data collected in the lab, the evidence of energy used to prove how these changes relate to he changes of the states of matter. During class data was collected to figure out the phase change of water from a solid to a liquid to a gas. . In fact, there is enough energy to break the bonds between the water molecules, but the attraction between the water molecules is strong enough to reform.
When a gas becomes a liquid, the process is called condensing. The third part of the graph is the water now increasing temperature and going from 0C to 100C. Phase Change Lab Essay Phase Change Lab Written Response Our objective in our phase change lab was to record observations of the increase in temperature in Celsius as water changed from solid to liquid to gas over a hot plate. The same is true when you melted the ice again - the reading on the scale remained the same. Student opinions vary on this topic.
Students will think that their water is boiling when they see bubbles, and that happens in the high 80's or low 90's, and this fact leads students to think that water boils at that temperature. Once it is all converted, the temperature can continue to rise. The starting temperature, ice volume, altitude, and rate of heating or cooling can be adjusted. Step 9: Compare the two marks - are they at the same height? But, matter on Earth exists mostly in three distinct phases: gas, liquid and solid. The quantitative data that was collected in the lab was the jump in temperature starting out at 2 degrees Celsius and turning into 95 degrees Celsius Boiling water over a period of 20 min. This is a direct relationship. The process where a liquid becomes a gas is called either boiling or evaporating.
Student Questions Student Questions are included on the Student Copy of the activity. When a liquid becomes a gas, heat is added to a substance and it is known as vaporization. The first phase change was from a solid to liquid, which is known as melting. Compare the molecular structure of solids, liquids, and gases. For example, in our graph the starting temperature 2 degrees Celsius jumped to 8 degrees Celsius within 3 minutes of heating. A question that could be asked would be where all of this energy comes from in order to change the state of the water from solid to liquid to gas. Phase change is often shown in a diagram like the one below: Diagram of water phase changes When a substance is in a solid state, it can absorb a lot of energy in the form of heat until it hits its melting point.