Which process is an example of a chemical change?
2 answers:
Answer:
The correct answer is :<u><em>a metal railing rusting in damp weather</em></u> is an example of a chemical change.
Explanation:
Physical property is defined as the property of a substance which becomes evident during physical changes. Example: Melting point
A physical change is defined as a change in which there is alteration in shape, size etc. No new substance gets formed in these reactions.
Example: Melting of ice
Chemical property is defined as the property of a substance which becomes evident during chemical changes. Example: Reactivity with other substances
A chemical change is defined as a change in which a change in chemical composition takes place. A new substance is formed in these reactions.
Example: Corrosion of iron called as rusting.
Rust is ferric oxide .
A metal railing rusting in damp weather is an example of chemical change because composition of an iron rail is changing.
Where as other examples given are the examples of physical change.
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Answer:
The nuclear charge increases, but the number of inner shielding electrons stays the same.
Explanation:
Their shielding does not change, so the effective nuclear charge — the charge felt by a valence electron — increases.
The valence electrons are pulled closer to the nucleus, decreasing the atomic radius.
For example, consider the elements of Period 3.
The number of protons increases as you go from one element to the next, but the number of inner electrons is constant.
