Purpose: The reason for this lab is to find the specific heat of the given metal. The first law of thermodynamics states that matter (or energy) can not be created nor destroyed. In this experiment, water was heated with the metal in it then placed into water at room temperature. A heat change occurred showing that the heat from the metal was transferred through the water. This explains why energy cannot be created nor destroyed.
Record your hypothesis on page 123. -My hypothesis is we can determine the different between each chemical reaction by the temperature change.To descide which one is exothermic and endothermic. 4. Summarize the procedures you will follow to test your hypothesis. -We measured in each chemical and added water besides, HCl we added NaOH.
In our lab we use a more sophisticated one which included a lid on the cup with an inserted thermometer and a stirrer. Thermochemistry is the study of the heat released or absorbed as a result of chemical reactions. The measurement of the total energy of a thermodynamic reaction is called enthalpy (q). This is the basis for Hess’s law which states that if two reactions are combined to yield a third reaction, the sum of the first two is equal to the third. The energy change is the same whether the process occurs in one step or many.
Lab 5 – Weather and Climate Change Lab 5 - Demonstration 1: Modeling the Water Cycle POST LAB QUESTIONS 1. Which water cycle processes are represented in this model and by what components? Answer = Condensation and evaporation are represented in this model. The warm water evaporated. Condensation formed inside the jar and under the lid of the jar.
Computer Additivity of Heats of Reaction: Hess’s Law 18 (1) Solid sodium hydroxide dissolves in water to form an aqueous solution of ions. (2) Solid sodium hydroxide reacts with aqueous hydrochloric acid to form water and an aqueous solution of sodium chloride. NaOH(s) + H+(aq) ) + Cl–(aq) → H2O(l) + Na+(aq) + Cl–(aq) ∆H2 = ? OBJECTIVES • • • • In this experiment, you will Combine equations for two reactions to obtain the equation for a third reaction. Use a calorimeter to measure the temperature change in each of three reactions.
Name: 6.03: Calorimetry Data and Observations: Part I: Insert a complete data table, including appropriate significant figures and units, in the space below. Also include any observations that you made over the course of part I. (4 points) I observed that when the metal is placed inside the calorimeter, it transfers heat to the water making the water increase temperature while the metal will decrease temperature. I also noticed that the system was the metal and the surroundings is the water, this is because the water is taking in the heat from the metal making the water warm. Metal Name Mass of Metal Volume of water Initial temp.
UNCW Honors Chemistry Lab #1- Laboratory Safety and Boiling Water Date Started: 8/26/11__________________ Date Completed __________________ Purpose: To determine the temperature at which water boils. To learn how boiling and melting are physical changes. Background Information/Observations: 1) Explain the most common scenario when you observe water boiling. 2) Explain how you could change the rate at which water boils. 3) Explain how you could change the temperature at which water boils.
This technique prevents the product to contact other reactants, and leave the heating environment which might cause side reactions. The removal of the product also helps to shift the equilibrium position of the incomplete reaction to the right hand side, and prevents backwards reaction, resulting in an increased yield of products. This experiment also introduces the idea of azeotrope. An azeotrope is a mixture of two or more pure compounds in such a ratio that its composition cannot be changed by simple distillation. This is because when an azeotrope is boiled, the resulting vapour has the same ratio of constituents as the original mixture of liquids.
Thermal Insulating Materials: A Self-Directed Experiment In our most recent lab, we determined the specific heat of a solid and learned the relative heat properties of substances having different specific heats. For this self-directed lab, we will determine what makes the best coffee-cup calorimeter and then determine which of various common substances is the best thermal insulating material is. We must first understand that thermal energy flows between two samples of matter at different temperatures. In order to prevent heat from escaping, thermal insulating materials are required to minimize the heat transfer by reducing the transfer of heat between two objects in direct contact, and the transfer of heat by electromagnetic waves. For this experiment we will be using cups of: metal, ceramic, plastic, and Styrofoam for our calorimeters.
An anhydrous salt is a salt without the presence of water or any moisture. In this experiment the anhydrous salt was separated as well as the water from the hydrate. The mass of the anhydrous salt was one of the parts needed to be calculated in order to find the complete formula of the hydrate. The law of conservation of mass states that matter in a compound can be altered, separated, and pure substance can be destroyed, but the mass always remains the same. In this experiment, the hydrate was separated into water and the anhydrous salt.