Answer:
A <u>tetraquark</u> in physics is an <u><em>exotic meson composed of four valence quarks</em></u>.
Explanation:
It has been suspected to be allowed by <u><em>quantum chromodynamics</em></u>, the modern story of strong interactions.
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Answer:
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Explanation:
In an endothermic reaction, “delta H” is always positive, since the system is absorbing heat from its surroundings, not releasing into the surroundings like in an exothermic reaction where the delta H is always negative.
So our endothermic reactions would be the first (484kJ) and the last (92kJ).
ALKENES LIKE ETHYLENE JOIN END TO END TO FORM POLYETHYLENE BY ADDITION POLYMERIZATION TO FORM A LONG CHAIN SINCE THEY ARE UNSATURATED.
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The answer is 1. chemical change.
That is when one substance changes into one or more new substances, it has exhibited a chemical change.
A Chemical change is a change that takes places when a substance changes its composition by forming one or more new substances. As here also, one substance is changing into one or more new substance, thus it exhibits a chemical change.
