Chemical a and chemical b react in an exothermic reaction. what can be known about what will happen when chemical a and chemical b are mixed together? a. the new substance will need more energy to form its chemical bonds than the old substance will release. b. more energy will be released from the old substance than the new substance will need to form its chemical bonds. c. the color will change as a result of the reaction. d. the substance will bubble as a result of the reaction.

Identify one disadvantage to each of the following models of electron configuration: -dot structures -arrow and line diagrams -written electron configurations type in your answer below. (answer) -dot structures do not show the distribution of electrons in orbitals and take up a lot of space. -arrow and line diagrams take up a lot of space and make it difficult to count electrons. -written configurations make it easy to lose count of electrons and do not show the distribution of electrons in orbitals.

Substance 33°f 100°f peanut oil solid liquid margarine solid liquid chocolate chips solid liquid which conclusion fits the data in the table? a. heat chemically changes chocolate and margarine. b. all solids become liquid at 100°f. c. removing heat from a substance it to melt. d. matter may change shape when it is heated.

What are fossils of organisms that existed over a wide area but only for a limited time period called?