Question

hypothesis 1: if you increase the temperature of a reaction, then the reaction rate will increase because particles experience more collisions at higher temperatures. to test the first hypothesis, you measured the reaction rate for several different dropdown done

Explanation:

The hypothesis is about the effect of temperature on reaction rate, which is a concept in Chemistry (a subfield of Natural Science). To test this, we need to measure reaction rates at different temperatures, so the blank should be filled with "temperatures" as we vary temperature to observe its effect on reaction rate.

Answer:

temperatures