3.4 An Atomic-Level View of Elements and Compounds Flashcards
Recall from Chapter 1 that we can categorize pure substances as either ______ or ______ .
Recall from Chapter 1 that we can categorize pure substances as either elements or compounds.
We can subcategorize elements and compounds according to the basic ____ that compose them.
We can subcategorize elements and compounds according to the basic units that compose them.
Elements may be either _____ or _____ .
Elements may be either atomic or molecular.
Compounds may be either _______ or _______.
Compounds may be either molecular or ionic.
Atomic elements exist in nature with single _______ as their basic units.
Atomic elements exist in nature with single atoms as their basic units.
helium is composed of _____ atoms.
helium is composed of helium atoms.
_______ _______ do not normally exist in nature with single atoms as their basic units; instead, they exist as molecules—two or more atoms of the element bonded together.
Molecular elements do not normally exist in nature with single atoms as their basic units; instead, they exist as molecules—two or more atoms of the element bonded together.
Most molecular elements exist as ________ molecules.
Most molecular elements exist as diatomic molecules.
ydrogen is composed of __ molecules, nitrogen is composed of __ molecules, and chlorine is composed of __ molecules.
ydrogen is composed of H2 molecules, nitrogen is composed of N2 molecules, and chlorine is composed of Cl2 molecules.
A few molecular elements exist as _______ molecules
A few molecular elements exist as polyatomic molecules
Phosphorus exists as__, and sulfur exists as __. Figure 3.5 ▼ shows the elements that exist primarily as diatomic or polyatomic molecules.
Phosphorus exists as P4, and sulfur exists as S8. Figure 3.5 ▼ shows the elements that exist primarily as diatomic or polyatomic molecules.
Propane is an example of a _____ compound
Propane is an example of a molecular compound
The basic units that compose propane gas are propane (____) molecules.
The basic units that compose propane gas are propane (C3H8) molecules.
Table salt (NaCl) is an ____ compound.
Table salt (NaCl) is an ionic compound.
Table salt formula unit is the simplest charge-neutral collection of ions: one Na+ ion and one Cl- ion.
Table salt formula unit is the simplest charge-neutral collection of ions: one Na+ ion and one Cl- ion.
