The answer is A. Melting snow because it is a physical change because you can then trun around and make it snow again
Physical change you can turn it back to the original
Chemical you can not
b) LiH (s) + H₂O (l) --> LiOH (aq) + H₂ (g)
When an alkali metal reacts with water it always produces the metal hydroxide and hydrogen gas which is liberated into the air.
2M(s)+2H₂O (l) →2MOH (aq)+ H₂ (g)
Lithium reacts with water very vigorously.
Alkali metals need to be stored under oil to prevent them from reacting with the oxygen and water vapour in the air. The reactivity of the alkali metals increases down the group.
Alkali metals consist of the following metals:
Lithium, sodium, potassium, rubidium, caesium.
Lithium, sodium and potassium also react vigorously with water and produce hydrogen gas and which is liberated in the air.
To know more about exothermic reactions, refer to this link:
brainly.com/question/10373907
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Answer:
da real answer would b 26.981538. let me kno if dis is not an option.
Explanation:
Answer:
i think it's D tbh, just cus it was the scientist who did the work