What is the term for a number placed before a chemical formula in an equation?

In a molecular formula, what does the small number written below and to the right of an element symbol specify?

Once the chemical formulas are verified, what should a student compare before choosing coefficients?

Ana replaces H₂O with H₂O₂ while trying to balance an equation. Why is this invalid?

Which comparison establishes that a chemical equation conserves atoms?

What happens to the atoms in the particle model?

How many chlorine atoms are represented by the entire expression on the card?

How many oxygen atoms are in one formula unit of the substance on the card?

The equation on the card conserves atoms but is not written in the simplest whole-number ratio. What adjustment is needed?

Supply the smallest whole-number coefficients for this reaction, reading the formulas from left to right.

Which coefficient should replace the question mark before O₂ to balance the displayed equation?

Which statement correctly evaluates the equation on the card?

For the decomposition shown, select the simplest whole-number coefficient sequence in formula order.

Which coefficient belongs before aluminum in the displayed equation?

Which element still has unequal atom counts in the equation on the card?

Complete the equation by choosing the coefficient before hydrogen gas.

In this tablet reaction, which coefficient should replace the question mark before carbon dioxide?

Choose the smallest whole-number coefficient sequence for aerobic respiration, in the order shown.

Which formula needs a coefficient greater than 1 when this equation is written in its simplest whole-number form?

After completing this equation, what is the simplest coefficient ratio of sodium phosphate to calcium chloride?