The average kinetic energy for a substance or object is directly proportional its temperature
according to the statement, which answer best describes how a substance would be affected if its temperature increased?
1. the substance mass would decrease
2. the substance's mass would increase
3. the substances average kinetic energy would decrease
4. the substance's average kinetic energy would increase

The answer is 4. The substance's average kinetic energy would increase.

Explanation:

The fact that a property is directly proportional to another means that if the first property changes in any direction, the second property changes in this direction too. In this case, if temperature changes by increasing the kinetic energy is going to increase too.

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answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.