HELP ASAPPP!!!! LIKE REALLYYY 20 POINTS!!
2 answers:
I believe the answer is “An atom is very small, and a model helps scientists study it.”
I’d say that an atom is extremely small so being able to have a model of one can help scientists study it a lot better.
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-delta H symbolises an exothermic reaction. Hence, it gives off heat. Reversely, it would absorb heat.
The answer that best fits the blank provided above is MECHANICAL.
1. Concentrated
2.same concentration
3.dilute
