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They are reversible.

They are reversible.

They include shifts in the phase of matter.
They include shifts in the phase of matter.

They involve heat.
They involve heat.

They form new substances.
They form new substances.

They often involve the breaking and forming of chemical bonds.

They often involve the breaking and forming of chemical bonds.

They can be observed through changes in physical properties.
They can be observed through changes in physical properties.

They are influenced by factors such as temperature and pressure.
They are influenced by factors such as temperature and pressure.

They can be represented by chemical equations.
They can be represented by chemical equations.

It seems like you are describing some characteristics of chemical reactions. Chemical reactions are reversible, meaning they can go in both forward and backward directions. They can also involve shifts in the phase of matter, such as from solid to liquid or gas. Additionally, heat is often involved in chemical reactions, either being absorbed or released. Lastly, chemical reactions result in the formation of new substances with different properties from the reactants.

It seems like you've listed a series of statements, but it's not clear what exactly these statements are referring to. Could you please provide more context or clarification so that I can better understand and assist you?