ASPECt
Energy: Forms, Transformation, Transfer, and Conservation
Chemical energy is associated with the arrangement of atoms that make up the molecules of the reactants and prod…
Item RG213001: If the chemical energy of the products of a chemical reaction is less than the chemcial energy of the reactants, energy was released to the surroundings because the amount of energy required to break bonds of the reactant molecules is less than the amount of energy released when bonds of the product molecules are formed.
The graph below represents the amount of chemical energy in a system of reactants before a chemical reaction occurs and the amount of chemical energy in the system of products after the reaction occurs.
Is energy taken in from or released to the surroundings the surroundings during this reaction and why?
- Energy is taken in from the surroundings because the amount of energy released when bonds of the reactant molecules are broken is less than the amount of energy required to form bonds of the product molecules.
- Energy is taken in from the surroundings because the amount of energy required to break bonds of the reactant molecules is greater than the amount of energy released when bonds of the product molecules are formed.
- Energy is released to the surroundings because the amount of energy required to break bonds of the reactant molecules is less than the amount of energy released when bonds of the product molecules are formed.
- Energy is released to the surroundings because the amount of energy released when bonds of the reactant molecules are broken is greater than the amount of energy required to form bonds of the product molecules.
- Distribution of Responses
- Scale Score for Item Difficulty
(200[Easy]-800[Difficult]) - 534
- Students Responding Correctly
| Group | Correct | Total | Percent |
|---|---|---|---|
| Overall | 349 | 1330 | 26% |
| Grades | |||
| 4–5 | N/A | N/A | N/A |
| 6–8 | 222 | 797 | 28% |
| 9–12 | 127 | 533 | 24% |
| Gender | |||
| Male | 155 | 588 | 26% |
| Female | 186 | 711 | 26% |
| Primary Language | |||
| English | 319 | 1194 | 27% |
| Other | 22 | 102 | 22% |
- Disciplinary Core Ideas
- PS1.A A stable molecule has less energy than the same set of atoms separated; one must provide at least this energy in order to take the molecule apart.
PS1.B Some chemical reactions release energy, others store energy.
PS1.B Chemical processes, their rates, and whether or not energy is stored or released can be understood in terms of the collisions of molecules and the rearrangements of atoms into new molecules, with consequent changes in the sum of all bond energies in the set of molecules that are matched by changes in kinetic energy.