FLASHCARDS SC8.P.8.5C

Front

How are chemical formulas used to represent substances?

Back

Chemical formulas use symbols for elements and subscripts to indicate the number of atoms in a compound, such as H₂O for water.

Front

What is a ball-and-stick model?

Back

A ball-and-stick model represents atoms as balls and bonds as sticks, showing the structure of molecules.

Front

Describe the atomic composition of a water molecule.

Back

A water molecule (H₂O) consists of two hydrogen atoms bonded to one oxygen atom.

Front

What is the difference between an element and a compound in terms of chemical formulas?

Back

Elements have a single symbol, such as O for oxygen, while compounds combine symbols, like CO₂ for carbon dioxide.

Front

How can ball-and-stick models help classify substances?

Back

Ball-and-stick models visually demonstrate whether a substance is an element (one type of atom) or a compound (multiple types of atoms bonded).

Front

How is the molecule CO₂ represented in chemical and model form?

Back

The chemical formula is CO₂, and the model shows one carbon atom bonded to two oxygen atoms in a linear structure.

Front

What does the subscript in a chemical formula indicate?

Back

A subscript shows the number of atoms of each element in a molecule, such as the "2" in H₂O meaning two hydrogen atoms.

Front

How can elementary substances be identified in chemical formulas?

Back

Elementary substances are represented by a single type of atom, such as N₂ for nitrogen gas.

Front

Give an example of classifying a compound using chemical formulas.

Back

NaCl (table salt) is classified as a compound because it consists of sodium (Na) and chlorine (Cl) atoms chemically bonded.

Front

How does a molecular model depict the atomic composition of methane (CH₄)?

Back

A ball-and-stick model of CH₄ shows one central carbon atom bonded to four surrounding hydrogen atoms in a tetrahedral shape.