Endothermic

temperatures are consistent with physical change presented in each the solution. The initial temperature of the water was 22 degrees due to room temperature. Through this, it is identifiable on which solution liberates heat (exothermic) or absorbs heat (endothermic), by comparing with the water in room temperature. Sodium Hydroxide: Sodium Hydroxide is recognised as exothermic solution. Due to the lattice energy and hydration energy of 737 kJ/mol and 779kJ/mol has a change of -41kJ/mol while comparing to

reactions, whereas reactions that absorb heat are known as endothermic reactions (Van Hecke, 1999). An example of an exothermic reaction would be condensation, in which water loses energy, and an example of an endothermic reaction would be melting, in which water gains energy. These two types of reactions are studied to better understand the properties and future potential of substances. For example, recent studies prove that the addition of endothermic chemicals in fire retardant substances effectively

Chapter 2 Essential Questions Describe the properties of water and why water has these properties. Water has unique properties because of its bonds with hydrogen. In a water molecule, there is an oxygen atom bonded with two hydrogen atoms. The oxygen side has more electrons than the hydrogen side, giving the molecule a slightly positive side and a slightly negative side, making a water molecule polar. The polarity of a water molecule gives it properties like cohesion, adhesion, and being a universal

emergence of the insoluble solid from solution happens, it is called precipitation. The property change in the reactants of the lab are when the water, alum, ammonia, react and create the aluminum hydroxide. When the precipitate is formed, it is an endothermic reaction because the change in the product, aluminum hydroxide, decreases in temperature. This is a chemical reaction because different elements rearrange themselves to form a new substance and while they do so, they either absorb heat or give it

For the five solutions (Beakers A~E) of CoCl2, 2-propanol, and methanol are approximately at the same temperature 24.5℃, but each beaker contains a different amount of methanol and 2-propanol. As we add more methanol, the dark blue 2-propanol solution becomes a lighter blue because the concentration of octahedral complex also increases upon addition of methanol. While the concentration of the octahedral increases, the concentration of tetrahedral complex decreases until equilibrium is reestablished

Intro ERT Chemical changes occur when molecules in the reactants break and form new compounds called the products. The separation of the bonds in the reactants require a certain amount of energy whereas energy is released when products are formed. There are two components where a physical or chemical change takes place. These are the system and surroundings. System and Surroundings The system is the site of the chemical reaction and the surrounding is the entire universe around it. The first law

Introduction The importance of this lab is to see if the temperature changes during a chemical reaction. A chemical reaction is accompanied by a change in temperature. Endothermic reaction is when the temperature drops. Exothermic reaction is when the temperature rises. For lab A you will need 3% hydrogen peroxide, measuring spoons, 3 table spoons of yeast, a plastic or paper cup, thermometer, watch, and 2 partners. Lab B you will need vinegar, baking soda, measuring spoon, water, paper, plastic

Combustion vs Respiration Activity 1 - Answer the following question in relation to combustion Explain what a combustion reaction is. Combustion usually occurs when a hydrocarbon reacts with oxygen to produce carbon dioxide and water. Write the general word equation for combustion. In words, the equation for combustion, in most cases, is a hydrocarbon plus oxygen equals carbon dioxide plus water plus heat. Other cases involve burning hydrogen and oxygen without carbon and reactions that create

Two chemical reactions occurred in our lab and I have evidence to prove why. To start, the main purposes of the lab were to make two chemical reactions (which are the two main ingredients in the antacid Maalox), to learn about why changes in solubility, state, appearance, pH, and energy indicate that the chemical reaction really happened, and to learn about balanced equations and classifying them. In Part 1, we combined alum and ammonia to make aluminum hydroxide, potassium ammonium sulfate, and

and breaks the barrier, allowing for the salt to dissolve in water and drop to 2°C. Many people use cold packs to reduce swelling and decrease blood flow of an injured area. Furthermore, cold packs absorb heat from their surroundings, making them endothermic systems that decrease/cool the temperature of their surroundings. Recording temperature changes and enthalpies of each ionic compound are needed to conclude which salt will produce the most effective cold pack.