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Which one of the following conditions must be met for an elementary reaction between two molecules...

Which one of the following conditions must be met for an elementary reaction between two molecules to occur?

- Collisions between reactant molecules must have enough energy to form the transition state and convert it into products

- The reactant molecules must be in a lower energy state than the products

- At least one of the reactant molecules must have a double or triple bond

- The molecules must be attracted to one another by ionic forces

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