Question

quiz 8.6be- counting atoms, chemical equations and the law of conservation of mass
possible points: 37.5
match the following vocabulary words with their definition.
coefficient
subscript
molecule
chemical formula
reactants
products
:: a small number written after a chemical symbol that identifies how many atoms of an element are in a substance
:: the substances that form as the result of a chemical reaction
:: a number that identifies how many molecules of a substance are present
:: a group of atoms held together by chemical bonds
:: a combination of chemical symbols and numbers to represent a substance
:: the substances that exist before a chemical reaction

Explanation:

To solve this matching problem, we analyze each vocabulary term and its corresponding definition:

1. Coefficient: A number that identifies how many molecules of a substance are present (e.g., in \( 2H_2O \), "2" is the coefficient for \( H_2O \) molecules).
2. Subscript: A small number written after a chemical symbol that identifies how many atoms of an element are in a substance (e.g., in \( H_2O \), "2" is the subscript for H atoms).
3. Molecule: A group of atoms held together by chemical bonds (e.g., \( H_2O \) or \( O_2 \) are molecules).
4. Chemical Formula: A combination of chemical symbols and numbers to represent a substance (e.g., \( CO_2 \) or \( NaCl \)).
5. Reactants: The substances that exist before a chemical reaction (found on the left side of a chemical equation).
6. Products: The substances that form as the result of a chemical reaction (found on the right side of a chemical equation).

Answer:

• coefficient : a number that identifies how many molecules of a substance are present
• subscript : a small number written after a chemical symbol that identifies how many atoms of an element are in a substance
• molecule : a group of atoms held together by chemical bonds
• chemical formula : a combination of chemical symbols and numbers to represent a substance
• reactants : the substances that exist before a chemical reaction
• products : the substances that form as the result of a chemical reaction