The Index of the First Key-Value Pair in a Dictionary

question 23

True/False

The index of the first key-value pair in a dictionary is 0.

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Definitions:

Subscripts

Small numbers in a chemical formula that indicate the number of atoms of the element directly before the subscript in the molecule.

Reactants

Original substances involved at the beginning of a chemical reaction, used throughout to form the end products.

Chemical Equation

A representation of a chemical reaction using symbols of the elements and formulae of compounds.

Coefficients

Numbers placed before the symbols or formulas in a chemical equation, indicating the relative amounts of substances involved in the reaction.