Question

instructions: for each one, read the question, highlight the answer, and then explain why you picked the answer using evidence from the text... 1) what is the primary reason chemical reactions involve changes in energy? a) to create new elements b) due to rearrangement and bonding changes of atoms c) to satisfy the law of conservation of momentum d) none of the above why did you pick your response? 2) according to the passage, what does the conservation of energy principle state? a) energy can be created from nothing b) energy is only transformed from one form to another c) energy must always increase in reactions d) energy is not conserved in chemical reactions why did you pick your response? 3) what role do catalysts play in chemical reactions? a) they increase the temperature of the reaction b) they provide an alternative pathway with a lower activation energy c) they prevent the reaction from occurring d) they change the law of conservation of energy why did you pick your response? 4) collision theory states that for a chemical reaction to occur, particles must: a) be in a liquid state b) collide with sufficient energy and proper orientation c) be inert gases d) always be at low temperatures why did you pick your response? 5) how does the concept of activation energy relate to the energy barrier in a reaction? a) it is the maximum energy required by the products b) it is irrelevant to the reaction pathway c) it is the minimum energy needed for reactants to proceed in a reaction d) it increases with catalysts why did you pick your response?

Explanation:

Step1: Analyze chemical reaction energy change

Chemical reactions involve energy changes mainly due to changes in atomic - bonding and rearrangement. New elements are created in nuclear reactions, not regular chemical reactions, and conservation of momentum is not related to energy changes in chemical reactions. So the answer to question 1 is B.

Step2: Recall conservation of energy principle

The conservation of energy principle states that energy is neither created nor destroyed, only transformed from one form to another. So the answer to question 2 is B.

Step3: Understand catalyst function

Catalysts work by providing an alternative reaction pathway with a lower activation energy, not by increasing temperature, preventing reactions, or changing the law of conservation of energy. So the answer to question 3 is B.

Step4: Recall collision theory

Collision theory states that for a chemical reaction to occur, particles must collide with sufficient energy and proper orientation. The state of matter, type of gas, or temperature are not the main requirements according to the theory. So the answer to question 4 is B.

Step5: Define activation energy

Activation energy is the minimum energy that reactants need to have in order to proceed with a reaction. It is related to the reaction pathway and is decreased by catalysts. So the answer to question 5 is C.

Answer:

1. B. Due to rearrangement and bonding changes of atoms
2. B. Energy is only transformed from one form to another
3. B. They provide an alternative pathway with a lower activation energy
4. B. Collide with sufficient energy and proper orientation
5. C. It is the minimum energy needed for reactants to proceed in a reaction