Multiple Choice
Which of the following is a common indicator that a chemical change has taken place during a chemical reaction?
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1. Intro to General Chemistry
Chemical Properties
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In the labeling of fertilizers, the first number in the N-P-K ratio represents the percentage by mass of which element?
A
Phosphorus (P)
B
Nitrogen (N)
C
Potassium (K)
D
Calcium (Ca)
Verified step by step guidance1
Understand that the N-P-K ratio on fertilizer labels represents the percentage by mass of three key nutrients: Nitrogen (N), Phosphorus (P), and Potassium (K).
Recognize that the first number in the N-P-K ratio corresponds to the percentage by mass of Nitrogen (N) in the fertilizer.
Recall that Nitrogen is essential for plant growth as it is a major component of chlorophyll and amino acids.
Note that the second number represents Phosphorus (P), and the third number represents Potassium (K).
Therefore, the first number in the N-P-K ratio specifically indicates the amount of Nitrogen (N) by mass in the fertilizer.
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