Why is it necessary to use models to study submicroscopic objects such as atoms and molecules? a. these objects do not exist in the real world. b. these objects are too far away to observe. c. these objects are too small to see. d. these objects can only be described mathematically.

The answer is C. These objects are too small to see.

The answer is: C. These objects are too small to see.

For example, ball and stick model gives informations about bond lenght and space filling model gives information about space occupied by atoms.

In chemistry, the ball-and-stick model is a molecular model of a chemical substance which is to display both the three-dimensional position of the atoms and the bonds between them. The atoms are represented by spheres, connected by rods which represent the bonds. Every ball represent one atom in one molecule and they have different colors for different atoms (for example, carbon is black, hydrogen is white, nitrogen is blue).  

There also other models: skeletal models, polyhedral models, composite models, computer-based models.  

Okay so, each element always is abbreviated with a capital letter and a lowercase letter, so each each new elements starts with a capital letter. To answer these problem you have to find the element or compound and whats in the element/compound and count how many you have. Then, it transfers over the arrow to how many of each element you have.

I hope this helps! :)