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The chemical composition of reactants is changed.
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∙ 7y ago
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The type of chemical change that absorbs heat energy?
Endothermic Reactions :)
What type of chemical change produces heat?
Exothermic reactions. E.g. combustion, oxidation
What chemical reactions can give off heat or what?
These chemical reactions are named exothermic.
Is it a chemical reaction if you but copper in a fire and it turns black?
yes it is a chemical reaction because the change involved heat and all chemical reactions involve heat and a difference in the appearence of the substance which has recieved heat is noticed
When rocks undergo metamorphic changes chemical reactions cause minerals to recrystallize or change form which agent provides the energy for these reactions?
Heat
Heat exchange in chemical reactions is due to a change in what?
Enthalpy-The heat added to or loss by a system at constant pressure
The type of chemical change that absorbs heat energy?
Endothermic Reactions :)
What type of chemical change produces heat?
Exothermic reactions. E.g. combustion, oxidation
What chemical reactions can give off heat or what?
These chemical reactions are named exothermic.
Why is temperature not a chemical change?
Temperature change, more accurately, a change in heat, is not a chemical change because it does not happen on a chemical level. Heat is the product of varying levels energy, not physically tangible particles. The higher the energy the higher the heat. To clear up any further confusion, a lot of people think heat is a chemical process, but it's not. Most people that think this, do so because the first way most of us imagine this change is through exothermic (reactions that create heat) reactions which are chemical processes like explosions.
Is it a chemical reaction if you but copper in a fire and it turns black?
yes it is a chemical reaction because the change involved heat and all chemical reactions involve heat and a difference in the appearence of the substance which has recieved heat is noticed
When rocks undergo metamorphic changes chemical reactions cause minerals to recrystallize or change form which agent provides the energy for these reactions?
Heat
Do chemical reactions need heat to start them off?
Endothermic reactions need heat.
Chemical reaction that produces heat?
Chemical reactions that produce heat (or energy) are known as Exothermic Reactions. (Example: combustion of fuels)
Is poaching an egg a physical or chemical change?
It's a chemical change: heat alters the protein bonds in the egg.
What is thermochemical equation?
In thermodynamics and physical chemistry, thermochemistry is the study of the heat evolved or absorbed in chemical reactions. It is concerned with the heat exchange accompanying transformations, such as mixing, phase transitions, chemical reactions, etc., which includes calculations of such quantities as the heat capacity, heat of combustion, heat of formation, etc. The laws of thermochemistry rest on two statements: # Lavoisier and Laplace's law (1782): the heat exchange accompanying a transformation is equal and opposite to the heat exchange accompanying the reverse transformation. # Hess's law (1840): the heat exchange accompanying a transformation is the same whether the process occurs in one or several steps Both laws preceded the first law of thermodynamics (1850); it can be shown, however, that they are a direct consequence of it. They also investigated specific heat and latent heat.
What is an effect of a chemical change?
A chemical change is when substances become new substances that cant go back to its physical properties (the ability to participate in chemical reactions). Chemical changes usually absorb or let off heat. Often, a second chemical change is needed to reverse an initial chemical change. A chemical change is when substances become new substances that have different chemical properties (the ability to participate in chemical reactions). Chemical changes usually absorb or let off heat. Often, a second chemical change is needed to reverse an initial chemical change.
