What is an example of adding energy to a substance and causing a physical change?A.heating a rock to make it hotB.warming ice to
1 answer:
Answer: B. warming ice to produce water
Explanation:
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
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.
Endothermic reactions are those in which heat is absorbed by the system and exothermic reactions are those in which heat is released by the system.
A. heating a rock to make it hot : It requires addition of energy and does not involve any change.
B. warming ice to produce water : It requires addition of energy and is a physical change
C. igniting a hydrogen-filled balloon: It needs energy and is a chemical change
D. burning paper to produce and carbon : It releases energy and is a chemical change
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Answer:
Here's what I get
Explanation:
Ethylamine has an N atom with a lone pair of electrons.
It can act as a Brønsted-Lowry base and accept a proton from water and become an ethylammonium ion.
The structure of the ion is shown below (there is a C atom at each of the four-way bond intersections).
