
Concept explainers
Interpretation: An example of a chemical change needs to be explained.
Concept Introduction: The nature of any substance is explained by their chemical properties and physical properties. A chemical property describes how a substance reacts with other substances. In a chemical change, a new substance is formed and absorption of energy or loss of energy occurs; it is an irreversible change. For example, rusting, dissolving, etc.

Answer to Problem 3STP
Correct answer: Option B.
Explanation of Solution
Reason for correct option: A nail is capable of combining with oxygen to form iron oxide, called rust. In other words, when iron comes in the contact with air and moisture, oxygen and iron combine to form a product iron oxide. In this process a new substance is formed and also, this is irreversible process. So, option B is a chemical change.
Reasons for incorrect options:
Option A: This is a physical change. So, this is an incorrect option.
Option C: This is a physical change. So, this is an incorrect option.
Option D: This is a physical change. So, this is an incorrect option.
Chapter 2 Solutions
World of Chemistry, 3rd edition
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- The acid-base chemistry of both EDTA and EBT are important to ensuring that the reactions proceed as desired, thus the pH is controlled using a buffer. What percent of the EBT indicator will be in the desired HIn2- state at pH = 10.5. pKa1 = 6.2 and pKa2 = 11.6 of EBTarrow_forwardCUE COLUMN NOTES (A. Determine Stereoisomers it has ⑤ Identify any meso B compounds cl Br cl -c-c-c-c-¿- 1 CI C- | 2,4-Dichloro-3-bromopentanearrow_forwardThe acid-base chemistry of both EDTA and EBT are important to ensuring that the reactions proceed as desired, thus the pH is controlled using a buffer. What percent of the EBT indicator will be in the desired HIn2- state at pH = 10.5. pKa1 = 6.2 and pKa2 = 11.6 of EBTarrow_forward
- What does the phrase 'fit for purpose' mean in relation to analytical chemistry? Please provide examples too.arrow_forwardFor each of the substituted benzene molecules below, determine the inductive and resonance effects the substituent will have on the benzene ring, as well as the overall electron-density of the ring compared to unsubstituted benzene. Molecule Inductive Effects Resonance Effects Overall Electron-Density × NO2 ○ donating O donating O withdrawing O withdrawing O electron-rich electron-deficient no inductive effects O no resonance effects O similar to benzene E [ CI O donating withdrawing O no inductive effects Explanation Check ○ donating withdrawing no resonance effects electron-rich electron-deficient O similar to benzene © 2025 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy Center Accesarrow_forwardUnderstanding how substituents activate Rank each of the following substituted benzene molecules in order of which will react fastest (1) to slowest (4) by electrophilic aromatic substitution. Explanation HN NH2 Check X (Choose one) (Choose one) (Choose one) (Choose one) © 2025 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy Center Aarrow_forward
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