Elements are represented by a chemical symbol, which is usually the first letter or two letters of the elements name.
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Explanation:
Hubble's Law basically states that the greater the distance of a galaxy from ours, the faster it recedes. It was proof that the Universe is expanding. It was also the first observational support for a new theory on the origin of the Universe proposed by Georges Lemaitre: the Big Bang.
Answer:
They are used because of preference or convenience, not necessity. These scales came about historically when there were no standards to calibrate a thermometer against. The Fahrenheit scale used the temperature of the coldest thing then known for its zero, which was salty ice.13-Oct-2019
The correct answer is B,
<span>It is endothermic, with both positive enthalpy and entropy changes.</span>
