Concept explainers
Interpretation:
Most abundant element in Earth’s crust and universe as a whole has to be chosen from the given options.
Concept Introduction:
Element is a pure substance and it cannot be broken down into simpler pure substance by chemical means like
Elements that are laboratory synthesized are radioactive in nature and they convert back into the original naturally occurring element by emission of radiation. All the elements that occur naturally are not evenly distributed on earth and universe.
Radiations that are emitted from stars can be used to estimate the elemental composition of universe. This indicates that hydrogen and helium are mostly dominant. On Earth’s crust oxygen and silicon are the two elements that account for about
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General, Organic, and Biological Chemistry
- Which of the following is an organic molecule?a. CO2 c. H2Ob. O2 d. C6H12O6arrow_forwardThe most abundant element by weight in the human body is a. carbon. b. hydrogen. c. oxygen.d. nitrogen.arrow_forwardWhat atom has only one proton?a. hydrogen d. a free radicalb. an isotope e. a radioisotopec. helium f. oxygenarrow_forward
- 8) Which of the following is NOT a use for isotopes discussed in class? a. Diagnosing Cancer b. Killing Cancer cells c. Explosive demolition d.Tracking environmental changearrow_forwardRefer to the following figure (first three rows of the periodic table) to answer the questions below. What element does not react with other elements? Group of answer choices A. hydrogen B. helium C. oxygen D. siliconarrow_forwardThe four most abundant elements needed by the human body are carbon, hydrogen, oxygen, and nitrogen. Because these are needed in large amounts to support our cells, these are referred to as a. isotopes. b. bulk elements. c. buffers. d. trace elements. e. essential elements.arrow_forward
- A slice of pizza has 500 kcal. If we could burn the pizza and use all the heat to warm a 50-L container of cold water, what would be the approximate increase in the temperature of the water? (note; A Liter of cold water weighs about 1 kg) a. 500 C b. 50C c. 10C d.100Carrow_forwardA substance that increases the rate of a chemical reaction without itself being used up in the reaction is called______. a. Reagents b. Enzymes c. Catalysts d. Activators e. Reactorsarrow_forwardRadioactivity is a phenomenon of the spontaneous emission of: A. protons (alpha particles) B. electrons (beta particles) C. gamma rays (short wave electromagnetic waves) D. All of the abovearrow_forward
- We can be sure that a mole of table sugar and a mole of vitamin C are equal in their a. mass b. volume c. number of atoms d. number of moleculesarrow_forwardChemical reactions that take place in living systems include A. Neutralization reaction B. Condensation reaction C. Hydrolysis reaction D. All the abovearrow_forwardFill in the blanks by writing the name of the definition: In a __________ reaction the transfer of electrons takes place a. Precipitation b. Decomposition c. redox d. displacementarrow_forward