Increases in temeprature increases the number of ……………..colliisons.

Answer

**Step-by-Step Solution:**

1. **Understanding Temperature and Kinetic Energy:**
- When the temperature of a system increases, the average kinetic energy of the molecules also increases. This is because temperature is a measure of the average energy of the particles in a substance.

2. **Collision Theory:**
- According to collision theory, for a reaction to occur, reactant molecules must collide with sufficient energy and proper orientation. The energy required for a reaction to occur is known as the activation energy.

3. **Effect of Temperature on Collisions:**
- As the temperature rises, more molecules have enough kinetic energy to overcome the activation energy barrier. This results in a greater number of effective collisions.

4. **High Energy Collisions:**
- With an increase in temperature, the number of high-energy collisions increases. These are the collisions that have enough energy to lead to a chemical reaction.

5. **Conclusion:**
- Therefore, the statement can be completed as: "Increases in temperature increases the number of high-energy collisions."

**Final Answer:**
Increases in temperature increases the number of **high-energy collisions**.

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