Question

1. what is a key characteristic of a closed system in terms of energy conservation? energy is completely destroyed within the system. energy is converted entirely into heat. energy can freely enter and exit. energy is conserved within the system. 16. which of the following describes a scientific theory? a well - substantiated explanation of some aspect of the natural world a prediction about the outcome of an experiment an educated guess made by a person working in a lab a statement describing an observed phenomenon

Explanation:

1. For question 15, in a closed - system, according to the law of energy conservation, energy is conserved within the system. Energy cannot be created or destroyed (first law of thermodynamics), and it is not converted entirely into heat in all cases, and energy cannot freely enter and exit as it is a closed system.
2. For question 16, a scientific theory is a well - substantiated explanation of some aspect of the natural world, based on a body of facts that have been repeatedly confirmed through observation and experiment. A prediction about an experiment is a hypothesis, an educated guess is also a hypothesis, and a statement describing an observed phenomenon is a scientific fact or observation.

Answer:

1. Energy is conserved within the system.
2. A well - substantiated explanation of some aspect of the natural world