-We measured in each chemical and added water besides, HCl we added NaOH. Next, we measured the water temperature to begin with then added the substance to it to determine the finally temperature. We minus the initial and finally to decide if the reaction is exothermic and endothermic. 5. Describe the anticipated temperature change of a system in which an exothermic process is taking place.
Answer = The processes of the water cycle not represented were sublimation, precipitation, transpiration, surface run-off, infiltration, and percolation. I don’t believe this model could be altered to include all of these processes unless there were additional specimens and additional testing possibly using soil, plants, ice, water, and a larger jar. 3. How would the “weather” be affected if the water was at a decreased temperature? What about at an increased temperature?
Add a small amount of sodium carbonate to a beaker. Record physical properties of hydrochloric acid and sodium carbonates appearance. 2. Write a hypothesis on what you think will happen when they are mixed. 3.
What is the mass of object 1? __________19.5g_____________________ An object’s volume is the amount of space it takes up. The volume of an irregular object can be measured by how much water it displaces in a graduated cylinder. Place object 1 into the Graduated Cylinder. What is the volume of object 1?
Observe the color change while it is being heated. After observing the color change, find the mass and moles of the hydrate. Then find the mass and moles of the water eliminated. And lastly find the mole ratio of water to hydrate. For part 2, do the same thing as part 1 except use an unknown hydrate and calculate the percent mass of water in an unknown hydrate.
|Name: Jamela Kendrick |Date: February 1,2012 | Alternate Graded Assignment Lab Report Answer the questions below. When you are finished, submit this assignment to your teacher by the due date for full credit. Observe the data table and procedure from the lab to help you answer the questions in the lab report. |Experiment |Observations | |cold water |no significant cloud formation resulted. | |cold water plus match |a small amount of cloud
Also include any observations that you made over the course of part II. (4 points) Unknown (A,B,C,D) Mass of Metal Volume of water Initial temp. in calorimeter Initial temp. in beaker Final temp. of mixture Metal C 25.605g 24.6mL 25.2°C 100.5°C 28.7°C Calculations: Show your work and write a short explanation with each calculation.
Let’s call this number X. Then the structural formula of BaCl2 hydrate can be written as BaCl2•XH2O. The reaction of dehydration is |BaCl2•XH2O ( BaCl2 + XH2O |(5) | According to the stoichiometry of the reaction (5) |[pic] |(6) | Where N1 is the number of moles of BaCl2 formed in the reaction (5) and N2 is the number of moles of water lost in the reaction (5). To find out N1 you need to divide the mass of BaCl2 after the reaction by its molar mass. To find out N2 you have to determine the mass of water produced in the reaction.
The lack of red blood cells keeps the fish from freezing and the viscosity of the blood is also lower. This fish is designed to live in cold climates, if for any reason it were to get warmer the fish would not be able to live. It has no way for it to deal with the warmer environment and it has evolved specifically to obtain oxygen and retain heat in a cold environment, not a warm
The Marble lost one gram of mass because it was affected by the vinegar. The Granite and the Sandstone were not affected by the vinegar. The worst stone to make the statue out of is the Limestone because it lost one and a half grams of mass. The best for the statue would be the Granite or the Sandstone because they didn’t loose any mass. All stones exposed to water did not loose any mass.