Chemistry, 30.08.2021 06:30 toni240

What are chemical? give some examples

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Answer from: yofavkay

Explanation:

A chemical substance is a form of matter having constant chemical composition and characteristic properties. Some references add that chemical substance cannot be separated into its constituent elements by physical separation methods, i.e., without breaking chemical bonds.Examples of Chemical ChangesExamples of Chemical ChangesBurning wood.Examples of Chemical ChangesBurning wood.Souring milk.Examples of Chemical ChangesBurning wood.Souring milk.Mixing acid and base.Examples of Chemical ChangesBurning wood.Souring milk.Mixing acid and base.Digesting food.Examples of Chemical ChangesBurning wood.Souring milk.Mixing acid and base.Digesting food.Cooking an egg.Examples of Chemical ChangesBurning wood.Souring milk.Mixing acid and base.Digesting food.Cooking an egg.Heating sugar to form caramel.Examples of Chemical ChangesBurning wood.Souring milk.Mixing acid and base.Digesting food.Cooking an egg.Heating sugar to form caramel.Baking a cake.Examples of Chemical ChangesBurning wood.Souring milk.Mixing acid and base.Digesting food.Cooking an egg.Heating sugar to form caramel.Baking a cake.Rusting of iron.

Answer from: Quest

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence, the electronegativity (or the ability to attract electrons) is lessened."

Answer from: Quest

the atomic number will stay the same no matter how many electrons it has, so it doesn’t decrease nor increase. it’ll only change with a different number of protons

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