Question
Which is the MOST ac accurate statement about the heating curve and energy? A Moving from A to C the temperature and the kinetic energy increases. B Moving from C to A the temperature decreases but the kinetic energy increases. C Although the temperature inc increases there is no information about energy change. D As time elapses, the substances turns into plasma and has the highest kinetic energy.
Answer
4
(326 Votes)
Gilbert
Master · Tutor for 5 years
Answer
A
Explanation
To address the question, we need to understand the concept of a heating curve and how it relates to changes in temperature, kinetic energy, and phases of matter.1. **Heating Curve Basics**: A heating curve graphically represents the change in temperature of a substance as heat is added. It typically shows phases such as solid, liquid, and gas, and the phase transitions, like melting and boiling.2. **Temperature and Kinetic Energy**: Temperature is a measure of the average kinetic energy of the particles in a substance. As temperature increases, the average kinetic energy of the particles also increases.3. **Phase Changes**: During a phase change, such as melting (solid to liquid) or boiling (liquid to gas), the temperature of the substance remains constant while the substance absorbs energy. This energy does not increase the kinetic energy but is used to overcome intermolecular forces.4. **Option Analysis**: - A. "Moving from A to C the temperature and the kinetic energy increases." This statement is generally true for the parts of the curve where there is no phase change (e.g., within the solid, liquid, or gas phases). - B. "Moving from C to A the temperature decreases but the kinetic energy increases." This statement is incorrect because if the temperature decreases, the kinetic energy also decreases. - C. "Although the temperature increases, there is no information about energy change." This is incorrect because an increase in temperature (except during phase changes) indicates an increase in kinetic energy. - D. "As time elapses, the substances turns into plasma and has the highest kinetic energy." This is incorrect for a standard heating curve, which typically only shows changes up to the gaseous state, not plasma.5. **Most Accurate Statement**: Considering the relationship between temperature and kinetic energy and the nature of phase changes, the most accurate statement among the given options is A.