Question

section vocabulary
law a descriptive statement or equation that reliably predicts events under certain conditions
theory a system of ideas that explains many related observations and is supported by a large body of evidence acquired through scientific investigation
model a pattern, plan, representation, or description designed to show the structure or workings of an object, system, or concept

1. explain what are some ways that scientists use models?
2. identify what are the three types of models used by scientists?
3. identify a model of a molecule can help you imagine what a molecule looks like. what are two ways that this model is different from the object it represents?
4. compare what is the difference between a scientific theory and a scientific law?
5. explain how can theories change over time?
6. explain why cant you use a model to learn everything about an object?

Explanation:

1. Scientists use models to make predictions, understand complex systems, and communicate ideas. For example, a weather - forecasting model helps predict future weather conditions.
2. The three types of models are physical models (like a model of a DNA molecule), mathematical models (equations representing population growth), and computer - based models (simulating traffic flow).
3. A molecule model is different from the actual molecule in scale (models are usually much larger) and in material (models are made of plastic, wood etc., while molecules are made of atoms).
4. A scientific law is a descriptive statement or equation that reliably predicts events under certain conditions, while a scientific theory is a system of ideas that explains many related observations and is supported by a large body of evidence. For example, Newton's law of universal gravitation is a law, and the theory of evolution is a theory.
5. Theories can change over time as new evidence is discovered through scientific investigations. New data may require the modification or replacement of existing theories.
6. A model is a simplified representation. It cannot capture all the complexity and details of the real - world object. For example, a model of a cell may not show all the biochemical reactions occurring in the actual cell.

Answer:

1. To make predictions, understand complex systems, and communicate ideas.
2. Physical models, mathematical models, computer - based models.
3. Scale and material.
4. A law predicts events, a theory explains observations.
5. As new evidence is discovered.
6. Because a model is a simplified representation.