When a liquid releases enough energy<span>. the </span>liquid<span> freezes, changing to a solid.
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Answer:
any of the set of metallic elements occupying a central block (Groups IVB–VIII, IB, and IIB, or 4–12) in the periodic table, e.g., iron, manganese, chromium, and copper. Chemically they show variable valence and a strong tendency to form coordination compounds, and many of their compounds are colored.
Explanation:
Answer:
Explanation: Water cycles through the biosphere as part of the water cycle. ... For example, gravity also pulls water from higher elevations in mountains and hills to low lying areas, whether these areas are oceans, lakes, or simply land (in which case the water is likely absorbed by plants or evaporates).
Explanation:
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1. Endothermic reaction
2. Exothermic reaction
3. Exothermic reaction
<u>Explanation:</u>
1. Evaporation of alcohol from the skin, here the heat is absorbed by the alcohol so that it gets evaporated from the skin and it is an endothermic process. As the reaction says that, the energy is added to the system, so it is endothermic.
C₃H₈O + 5.2 kJ → C₃H₈O(g)
2. Burning of propane in a gas grill:
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O + 1652 kJ.
Here energy is released or given out which is termed as exothermic reaction.
3. Oxidation of iron to form rust:
4 Fe + 3O₂ → 2 Fe₂O₃ + 2221 kJ.
Here also energy is released along with the products, so it is termed as exothermic reaction.
Whenever energy is absorbed, the reaction is endothermic in contrast if the energy is released then the reaction is exothermic.
Answer:
Electronegativity, symbol χ, measures the tendency of an atom to attract a shared pair of electrons (or electron density).
An atom's electronegativity is affected by both its atomic number and the distance at which its valence electrons reside from the charged nucleus.
The higher the associated electronegativity, the more an atom or a substituent group attracts electrons.
