15. Simbol E dalam heksadesimal adalah a. 11 b. 12 c. 13 d. 14
Answer (4)
When water evaporates from its liquid form it changes into a gas. However, when water evaporates and becomes a gas it is no longer water (the name given to its liquid form) but is now considered water vapor. Water vapor is invisible and is lighter than air and for it to turn into water again must go through a process of condensation.
Evaporation is a physical change where liquid water turns into water vapor without altering the chemical structure of H2O. In this process, energy and the arrangement of molecules change but not their identity, exemplified by the balance of evaporation and condensation in a closed container.
When a puddle of water evaporates, the water does not change into a new kind of matter; instead, it undergoes a physical change. The process of evaporation is when liquid water becomes water vapor, which is still H2O in gaseous form. During evaporation, energy increases among the water molecules, allowing them to escape into the air. Even when the temperature increases and molecules receive more energy, the structure of the water molecule itself does not change. Hence, the water maintains its chemical identity throughout this phase change.
A simple experiment involving two beakers reveals this process. In an open beaker, water decreases in level as it evaporates into the air, while in a closed beaker, evaporation and condensation rates eventually equalize, and no change in water level is observed.
When water evaporates, it changes from a liquid to a gas called water vapor, but it does not become a new kind of matter. It remains the same substance, H₂O, only in different physical states. Thus, evaporation is a physical change, not a chemical change.
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Jawaban:d. 14Penjelasan:Dalam sistem bilangan heksadesimal, digit‑digitnya bernilai sebagai berikut:A = 10B = 11C = 12D = 13E = 14F = 15Maka simbol “E” merepresentasikan nilai 14.
