Interpretation: The option that does not represent a chemical change should be identified.
Concept Introduction: In a chemical change, the
Answer to Problem 1STP
Correct answer: Paper being shredded.
Explanation of Solution
Reason for correct option:
During shredding a paper, only the appearance of the paper changes, and the chemical composition of the paper does not change. Since the chemical composition of paper remains the same, it is not a chemical change. Instead, it is a physical change.
Reasons for incorrect options:
Steel rusting, charcoal burning, and a newspaper yellowing in the sun are examples of chemical change as the chemical compositions are different from the initial substance and reactants. A completely new matter is obtained after steel rusting, charcoal burning, and a newspaper yellowing in the sun.
Chapter 2 Solutions
EP CHEMISTRY-ETEXT ACCESS
- 3. Propose a synthesis for the following transformation. Do not draw an arrow-pushing mechanism below, but make sure to draw the product of each proposed step (3 points). CN + En CNarrow_forward3) Propagation of uncertainty. Every measurement has uncertainty. In this problem, we'll evaluate the uncertainty in every step of a titration of potassium hydrogen phthalate (a common acid used in titrations, abbreviated KHP, formula CsH5KO4) with NaOH of an unknown concentration. The calculation that ultimately needs to be carried out is: concentration NaOH 1000 x mass KHP × purity KHP molar mass KHP x volume NaOH Measurements: a) You use a balance to weigh 0.3992 g of KHP. The uncertainty is ±0.15 mg (0.00015 g). b) You use a buret to slowly add NaOH to the KHP until it reaches the endpoint. It takes 18.73 mL of NaOH. The uncertainty of the burst is 0.03 mL.. c) The manufacturer states the purity of KHP is 100%±0.05%. d) Even though we don't think much about them, molar masses have uncertainty as well. The uncertainty comes from the distribution of isotopes, rather than random measurement error. The uncertainty in the elements composing KHP are: a. Carbon: b. Hydrogen: ±0.0008…arrow_forwardDon't used hand raiting and don't used Ai solutionarrow_forward
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