The diagram shows the course of the reaction for a chemical reaction. With and without catalyst. R stands for reactant and p stands for product. Which statement or statements are true? 1. H4 and H5 together make up the total enthalpy change of the reaction.❌?
2. The reaction is endothermic.❌
3. The presence of catalyst allows a larger amount to be formed a larger amount of the products.❌?
4. H1 <0 ✅
(EXOTERM h1 <0
(Endotherm h1> 0)
5. The activation energy is higher for the catalyzed reaction ❌?
6. The reaction is exothermic
7. H1 is the total enthalpy change ✅?
Activation energy non-catalyzed reaction = H3? ✅

Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.

Heat energy, carbon dioxide, and water are released through which process? a. photosynthesis b. depolymerization c. digestion d. cellular respiration

Who examines and coordinates the cleanup of polluted sites?