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Why do we say that chemical reactions always involve changes in energy?
Chemical reactions involve the breaking and forming of chemical bonds, which requires energy to overcome or release. This results in changes in the potential energy of the system. Additionally, the activation energy required to start a chemical reaction is a clear demonstration of energy change.
Chemical reactions always involve changes in a chemical?
There will always be changes in one of the reactants. In some chemical reactions, one of the chemicals works as a catalyst to encourage a reaction between two or more chemicals but does not change during the reaction.
Why do chemical reactions always involve a change in energy?
Chemical reactions involve the breaking and formation of bonds between atoms, which requires energy. The energy change in a reaction is needed to overcome the activation energy barrier and initiate the process. This change in energy is essential for the rearrangement of atoms and the formation of new substances.
What is always a characteristic of a chemical change but not always a characteristic of a physical change?
When a chemical change takes place, the chemical structure of particles involved changes (i.e. one or more new substances are formed). In a physical change, the physical state of the particles involved changes (e.g. a solid melts and becomes a liquid). The chemical structure of the particles does not change, and no new substance is formed.
What do chemical changes always take in or give off?
Some reactions give off heat (exothermic), others absorb heat (endothermic). All reactions increase entropy.
Why do chemical reactions always involve a chemical change?
Chemical bonds always break in chemical reactions, causing changes in energy.
Why do reactions always involve a change in energy?
Chemical bonds always break in chemical reactions, causing changes in energy.
Do chemical reactions always involve changes in energy?
no
Chemical Reactions always involved changes in chemical?
Yes. The chemicals (reactants) that undergo a chemical reaction react with each other and make new chemicals called the products.
Is energy always involved in physical or chemical changes?
Yes
Is energy always involved in making or breaking chemical bonds?
no, some reactions are spontenous.
Why do we say that chemical reactions always involve changes in energy?
Chemical reactions involve the breaking and forming of chemical bonds, which requires energy to overcome or release. This results in changes in the potential energy of the system. Additionally, the activation energy required to start a chemical reaction is a clear demonstration of energy change.
What is always involved when physical or chemical changes occur in matter?
When physical changes occur in matter, the substance's state or appearance changes without altering its chemical composition. In contrast, chemical changes involve a modification in the substance's chemical composition, resulting in the formation of new substances.
Chemical reactions always involve changes in a chemical?
There will always be changes in one of the reactants. In some chemical reactions, one of the chemicals works as a catalyst to encourage a reaction between two or more chemicals but does not change during the reaction.
Is always obvious when a substance undergoes a chemical changes yes or no?
chemical changes form to completely different things so yes
Is energy involved in all changes?
yes all changes involve exchange in energy
When chemical reactions occur energy is always absorbed?
No, chemical reactions can be endothermic or exothermic.
