Answer and Explanation: The physical changes that are endothermic are melting, vaporization and sublimation. Melting is the change from the solid state to the liquid state.
Table of Contents
Which physical changes are exothermic?
Exothermic reactions: Heat is released. 2) Rain: Condensation of water vapor into rain releasing energy in the form of heat is an example of an exothermic process.
Are exothermic reactions physical or chemical?
Chemical reactions that release energy are called exothermic. In exothermic reactions, more energy is released when the bonds are formed in the products than is used to break the bonds in the reactants.
Is an endothermic reaction physical or chemical?
Endothermic reactions are chemical reactions in which the reactants absorb heat energy from the surroundings to form products.
Is melting endothermic or exothermic?
Melting, vaporisation and sublimation are all processes of endothermia. They need energy or heat to be applied. Both exothermic processes are reverse processes (freezing, condensation and deposition).
Which physical changes are endothermic melting and freezing?
Fusion, vaporization, and sublimation are endothermic processes, whereas freezing, condensation, and deposition are exothermic processes.
Is boiling endothermic or exothermic?
Because we must add heat, boiling water is a process that chemists call endothermic. Clearly, if some processes require heat, others must give off heat when they take place. These are known as exothermic.
Is ice melting endothermic or exothermic?
One of the most common endothermic reactions is the melting of ice. Heat is drawn in from the surroundings, triggers this reaction, and begins to break the chemical and physical bonds holding the ice together.
Is going from solid to liquid exothermic?
This means that as you move from solid to liquid to gas, all accompanying phase changes require the input of heat. Thus, these phase changes are an example of an endothermic reaction. On the other hand, moving from gas to liquid to solid requires the opposite: Heat must be released.
Is sweating exothermic or endothermic?
Explanation: Sweating reduces skin temperature because the sweat that is secreted to the skin evaporates, which is an endothermic process. Thus, heat is absorbed from the body and skin to drive the evaporation of the sweat on the skin.
Are humans endothermic?
1 Ectothermic and Endothermic Metabolism. Humans are endothermic organisms. This means that in contrast to the ectothermic (poikilothermic) animals such as fishes and reptiles, humans are less dependent on the external environmental temperature [6,7].
What makes a reaction endothermic or exothermic?
In exothermic reactions, more energy is released when the bonds are formed in the products than is used to break the bonds in the reactants. Exothermic reactions are accompanied by an increase in temperature of the reaction mixture. Chemical reactions that absorb (or use) energy overall are called endothermic.
Which chemical or physical change is an endothermic process quizlet?
In a chemical reaction, when energy is being absorbed, it is said to be endothermic. For example when we are boiling water on a stove, the water is continuously absorbing the heat from the stove.
Is concrete endothermic or exothermic?
The heat produced by concrete during curing is called heat of hydration. This exothermic reaction occurs when water and cement react.
Which process is always endothermic?
Water while freezing converting itself from liqued to solid state.
Is melting exothermic or exothermic?
II. Heat energy will cause covalent bonds in water to break as water converts from the solid state to the liquid state.
Is freezing exothermic?
When water becomes a solid, it releases heat, warming up its surroundings. This makes freezing an exothermic reaction.
Is rusting endothermic or exothermic?
Incredibly, the reaction between iron and moist air that produces rust is a very exothermic process and generates lots of heat.
Is burning sugar endothermic or exothermic?
Answer – endothermic as heat (energy) is absorbed by the sugar to change phases.
Is rubbing hands with alcohol endothermic or exothermic?
Answer and Explanation: This is an endothermic reaction because the heat is the basic requirement of evaporation. Hence, the evaporation of alcohol during rubbing on the skin absorbs heat from the skin and consequently, the temperature of a particular portion of the skin decreases so we feel cold.
Is burning a candle endothermic or exothermic?
Lighting a candle is an exothermic reaction reaction because it involves combustion reaction. This action involves production of energy in the form of heat and smoke as its byproduct when combustion takes place.
Is burning wood endothermic or exothermic?
The combustion of wood is an exothermic reaction that releases a lot of energy as heat and light.
Is water an endothermic reaction?
The boiling of water is an endothermic process. This is mainly because, for water to boil, heat is supplied. An endothermic process is defined as the chemical reaction in which heat energy is absorbed from its surrounding in the form of heat.
Is frying an egg endothermic?
Frying an egg is a chemical reaction. It is an example of an endothermic reaction or one that takes in heat to make the reaction occur.
Is burning coal endothermic or exothermic?
To release this energy, we burn the coal. This is an exothermic chemical process called combustion. It releases energy stored in the chemical bonds that hold the molecules together.