Which of the following statements about scientific models is true?
a. models are useful only if you can hold them in your hands.
b. models are useful only if they can be used to explain or make predictions about something
c. models are useful only if they represent an object, process, or system that is too small to study directly
d. models are useful only if they represent reality exactly

The following statements about scientific models is true

b. models are useful only if they can be used to explain or make predictions about something

In a particular research or experiment, a model is needed that can describe the state of a process, system or object.

For example the atomic model of several researchers such as the Bohr, Rutherford atomic model and so on

And also the depiction of models of certain compounds which include:

Atoms are described in the form of spheres and their bonds in the form of sticks.

For double or triple-double bonds described in two or three curved stick shapes

Atoms can be distinguished from the color of the spheres

The model we use is not 100% the same as the real situation in the field, just as an illustration to hypothesize research

The model used can be an actual scale or can also be on a smaller scale, not possible on a larger scale

There are many models that we can't hold with our hands like moving  models

So the right answer is

b. models are useful only if they can be used to explain or make predictions about something

ball-and-stick model

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he different ways to represent compounds

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alcohol structure

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Keywords: scientific models, objects, processes, system

particle   p is an electron and particle q is a neutron