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Interpretation: The statements that characterize the nucleus of every atom need to be identified.
Concept Introduction:
An atom is composed of electrons, protons, and neutrons. Here, protons and neutrons are present in the nucleus of an atom and electrons are present in atomic orbitals around the nucleus.
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Answer to Problem 3STP
The correct option is (A).
Explanation of Solution
Reason for correct option:
The three subatomic particles are proton, neutron, and electron. Here, the proton is a positive charge, the electron is negative charge and neutrons have zero charges. In an atom, protons are present in the nucleus of atom. Thus, the nucleus has a positive charge.
Therefore, the statement I is correct.
In an atom, there is no mass of electrons, but protons and neutrons have great mass. Thus, the nucleus has all mass of an atom. Due to its great mass and small size, the nucleus is dense.
Therefore, statement II is correct.
Since both statements I and II are correct, the correct option is (A).
Reason for incorrect options:
The nucleus is composed of protons and neutrons only. Electrons are not present in the nucleus of an atom, but they are present in the atomic orbitals around the nucleus. Thus, statement III is incorrect.
Since the III statement is not correct, options (B), (C), and (D) are incorrect options.
Chapter 5 Solutions
Chemistry 2012 Student Edition (hard Cover) Grade 11
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- Use solubility rules to provide balance molecular equation, total, and net ionic equationarrow_forwardBr HO ? HO ✓ OHarrow_forwardUse the literature Ka value of the acetic acid, and the data below to answer these questions. Note: You will not use the experimental titration graphs to answer the questions that follow. Group #1: Buffer pH = 4.35 Group #2: Buffer pH = 4.70 Group #3: Buffer pH = 5.00 Group #4: Buffer pH = 5.30 Use the Henderson-Hasselbalch equation, the buffer pH provided and the literature pKa value of acetic acid to perform the following: a) calculate the ratios of [acetate]/[acetic acid] for each of the 4 groups buffer solutions above. b) using the calculated ratios, which group solution will provide the best optimal buffer (Hint: what [acetate]/[acetic acid] ratio value is expected for an optimal buffer?) c) explain your choicearrow_forward
- How would you prepare 1 liter of a 50 mM Phosphate buffer at pH 7.5 beginning with K3PO4 and 1 M HCl or 1 M NaOH? Please help and show calculations. Thank youarrow_forwardDraw the four most importantcontributing structures of the cation intermediate thatforms in the electrophilic chlorination of phenol,(C6H5OH) to form p-chlorophenol. Put a circle aroundthe best one. Can you please each step and also how you would approach a similar problem. Thank you!arrow_forwardA 100mM lactic acid/lactate buffer was found to have a lactate to lactic acid ratio of 2 and a pH of 4.2. What is the pKa of lactic acid? Can you please help show the calculations?arrow_forward
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