Question

1. what is the difference between subscripts and coefficients in a chemical formula?

1. where is the subscript written in a chemical formula?

1. where is the coefficient written in a chemical formula?

1. when an element symbol does not have a subscript next to it, what does this mean?

1. each known element is made up of the same type of _____________.

a. atoms
b. elements
c. molecules
d. compounds

1. which of the following is not an example of a pure substance

a. atom
b. heterogeneous mixture
c. compound
d. element

1. draw the following particle diagrams to represent the matter described in the boxes below:

a. molecule composed of three atoms of the same element b. molecule composed of two atoms of two different elements

Explanation:

1. Subscripts indicate atoms per molecule; coefficients indicate number of molecules/units.
2. Subscripts are written below and to the right of element symbols.
3. Coefficients are written before the chemical formula.
4. No subscript means one atom of that element in the formula.
5. Elements are defined by identical atoms.
6. Pure substances are elements/compounds; mixtures are not pure.
7. A: Three identical circles bonded; B: Two different circles bonded.

Answer:

1. Subscripts show the number of atoms of an element in a molecule, while coefficients show the number of entire molecules or formula units.
2. Below and to the right of the element symbol.
3. Before the chemical formula.
4. There is one atom of that element in the molecule or formula unit.
5. a. Atoms
6. b. Heterogeneous mixture
7. A: A diagram with three identical circles connected together (e.g., O-O-O for O₃). B: A diagram with two different circles connected together (e.g., H-O for H₂O, but as two different atoms; note: H₂O has three atoms, but the question says two atoms of two different elements—so e.g., H-Cl).