Which of the following statements regarding energy changes during a reaction are true? . 1) if the heat of reaction, δh, is negative, the energy of the products is higher than the energy of the reactants, and the reaction is endothermic.2)two or more atoms must collide, with proper orientation, with energy greater than or equal to the activation energy for a reaction to occur.3)when the activation energy is high, the reaction rate is fast.4) the energy of a collision between atoms or molecules must be greater than the activation energy (ea) for bonds to be broken.

2)Two or more atoms must collide, with proper orientation, with energy greater than or equal to the activation energy for a reaction to occur

Explanation:

Activation energy can be defined as the energy needed in order for a reaction to occur. Activation energy helps to also determine the rate of the reaction that is happening.

When the activation energy of a particular reaction is high, the rate or speed of that reaction tends to be slow while when the activation energy of a particular reaction is low, the rate or speed of that reaction in quite fast.

The Collision theory states that the collision of two or more reactants with the appropriate amount of energy (activation energy) and the proper or right orientation is what causes an effective chemical reaction to occur.

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.