What type of reaction requires the greatest energy to get started? a. fusion b. fission c. physical d. chemical

Alice added sodium chloride to water and stirred the water for several minutes. alice is most likely trying to demonstrate that ionic compounds a. are hard. b. can dissolve. c. are clear. d. can melt.

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What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration