How is the Hf related to the H of a reaction?A.The Hreaction is the same thing as the Hf, reactants.B.The Hreaction is the sum of the Hf, products and the Hf, reactants.C.The Hreaction is the same thing as the Hf, products.D.The Hreaction is the difference between Hf, products and Hf, reactants.SUBMITarrow_backPREVIOUS

How does the Hreaction relate to the Hf of molecules involved in a reaction?A.Hreaction = Hf, reactantsB.Hreaction = Hf, productsC.Hreaction = Hf, products + Hf, reactantsD.Hreaction = Hf, products - Hf, reactants

What does the H of a reaction represent?A.It represents the randomness of the products.B.It represents the usable energy in a reaction.C.It represents the thermal energy in a system.D.It represents the heat involved in a reaction.SUBMITarrow_backPREVIOUS

Which of the following describes an exothermic reaction?A.Hf, reactants = 0B.Hf, reactants = Hf, productsC.Hf, reactants > Hf, productsD.Hf, reactants < Hf, products

A chemical reaction is shown below.​​Fe + H2O → Fe3O4 + H2​​Unit 2 Review​​What are the products in the equation?​​A Fe3O4 only​​B Fe only​​C Fe and H2O​​D Fe3O4 and H2​​13 Which of the following occurrences indicates that a chemical reaction has taken place?​​A An odor is produced by burning a sugar cube.​​B A puddle is produced by melting an ice cube.​​C A loud noise is produced by crushing a can.​​D A shard of glass is produced by breaking a bottle.​​Critical Thinking​​Answer the following questions in the space provided.​​14 List three properties of metals that nonmetals typically do not have.​​Describe where metals and nonmetals are found on the periodic table.​​What is the name for elements that have some properties of metals and some properties of nonmetals?​

Name two factors that affect the rate of a chemical reaction. Explain how each one would affect the rate.