You happen to be visiting Northern California and you are driving by Suisun Bay, a notorious graveyard for old ships. You notice that all of these ships appear tobe rusting away. Which of the following statements is true?A chemical change is the result of a chemical reaction. A physical change just changes the state of the substance. A chemical change is the result of a chemical reaction. A physical change just changes the state of the substance. Changes in matterThe rusting of the metal is neither a chemical change nor a physical change. The rusting of the metal is a chemical change. The rusting of the metal is both a chemical change and a physical change. The rusting of the metal is a physical change. Black ice is neither a chemical change nor a physical change. Black ice is an example of a chemical change. Black ice is both a chemical change and a physical change. Black ice is an example of a physical change.

1) rusting of metal is both chemical and physical change

2) black ice is an example of a physical change

Explanation:

when metal rusts, it is due to a reaction between the atoms in the metal and the atoms in the air(oxygen) or water(oxygen). When it rusts it also physically changes the look of the metal from silver to dirty brownish maroon.

Black ice is a change in state hence it cannot be a chemical change as the original substance NO LONGER EXISTS in a chemical reaction. It is a physical change however as the ice is changing into a different state of matter.

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alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.

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