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What are the two most abundant elements by mass in the earth’s crust, oceans, and atmosphere? Does this make sense? Why? What are the four most abundant elements by mass in the human body? Does this make sense? Why?
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Interpretation: The two most abundant elements by mass in the Earth's crust, oceans and atmosphere are to be stated with a valid explanation. Also, the four most abundant elements by mass in the human body are to be stated with a valid explanation.
Concept introduction: The element that has the highest concentration (by mass) on the Earth is known as the most abundant element of the Earth.
To determine: The name of the two most abundant elements by mass in the Earth's crust, oceans and atmosphere with valid explanation; the name of the four most abundant elements by mass in the human body with a valid explanation.
Answer to Problem 1RQ
Answer
Oxygen and silicon are the two most abundant elements by mass in the Earth's crust, oceans and atmosphere.
Carbon, hydrogen, nitrogen and oxygen are the most abundant elements by mass in the human body.
Explanation of Solution
Explanation
Oxygen and silicon are the two most abundant elements by mass in the Earth's crust, oceans and atmosphere.
Yes, this makes sense. Earth’s crust contains silicon dioxide
Carbon, hydrogen, nitrogen and oxygen are the most abundant elements by mass in the human body.
Carbon, hydrogen, nitrogen and oxygen are the most abundant elements by mass in the human body.
Yes, this makes sense. The human body contains greater amount of protein and amino acids.
The composition of protein is carbon, oxygen and nitrogen. The main composition of amino acid is carbon, oxygen, hydrogen and nitrogen.
Conclusion
Since, Earth’s crust contains the highest concentration of silicon dioxide and ocean contains the highest concentration of oxygen. Hence, oxygen and silicon are the two most abundant elements in the Earth’s crust and ocean.
Since, the human body is basically composed of carbon, oxygen, hydrogen and nitrogen. Therefore, these are the most abundant elements by mass in the human body
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Chapter 20 Solutions
Chemistry
- 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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