Asked by Gabriel

Which statement describes how chemical formulas, such as H2O, represent compounds?

They show the types of molecules that make up an atom.
They show the elements that make up a compound.
They show the three-dimensional shape of a molecule.
They show the types of bonds that exist between elements.


There are several ways to model a compound. One type of model is shown.

A central C attached to 3 C's by 1 line each, each of the 3 C's being attached to 3 H's by a 1 line each. The central C is also attached by 1 line to a C, which is attached to 2 H's and a C by a single line each. The C is attached by 2 lines to an O ad by 1 line to another O. The O with 1 line is attached by 1 line to an H.
What is the chemical formula for the molecule modeled?

CHO
C4H11O2
C6H12O2
C6H9O



Two models of the same compound are shown.

A top line labeled Model A saying C subscript 2 H subscript 4 O subscript 2. A bottom image with 2 C's connected by 1 black line. The left C has 3 H's connected to it by 1 black line each and the right C has 2 Os attached to it, the top O by two black lines and the bottom O by 1 black line. The bottom O also has an H attached to it by 1 black line.
In what way is Model B better than Model A?

Model B shows the types of elements in the compound, but Model A does not.
Model B shows the three-dimensional shape of the molecule, but Model A does not.
Model B shows how the atoms in the molecule are connected, but Model A does not.
Model B shows the number of atoms of each element in the molecule, but Model A does not.




Which statement correctly describes why a compound is a pure substance?

A compound is not a pure substance because each of its molecules is made up of the atoms of two or more different elements.
A compound is a pure substance because its molecule cannot be broken down into simpler particles by physical means.
A compound is not a pure substance because it is not an element, and only elements are pure substances.
A compound is a pure substance because it consists of two different elements, which are pure substances.




There are several different models that represent compounds. One type of model is shown.

A large black sphere connected to 4 small blue spheres by 4 grey sticks.
What type of model is shown?

a structural formula
a chemical formula
a space-filling model
a ball-and-stick model

All Answers 1

Answered by GPT-5 mini AI
1) They show the elements that make up a compound.

2) C6H12O2

3) Model B shows how the atoms in the molecule are connected, but Model A does not.

4) A compound is a pure substance because its molecule cannot be broken down into simpler particles by physical means.

5) a ball-and-stick model