
Concept explainers
Interpretation:
Time required for the polonium-238 radioisotope to decrease to
Concept Introduction:
For a radioactive isotope, the relative instability is expressed in terms of half-life. Half-life is the time required for half of the given quantity of the radioisotope to undergo radioactive decay. Half-life of the radioactive isotope is independent of the quantity of the radioactive isotope. Half-life of a radioactive isotope can be expressed as,
Number of disintegrations per unit time is known as the activity of the sample. The rate of radioactive decay can be expressed as,
Where,
If initial activity of the sample is
Rearranging equation (3) as shown below,
Considering equation (2), the equation (3) can be rewritten in terms of fraction of radioactive atoms that is present after time

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Chapter 18 Solutions
Chemistry: The Molecular Science
- You are trying to determine whether the following organic reaction can be done in a single synthesis step. If so, add any missing reagents or conditions in the drawing area below. If it isn't possible to do this reaction in a single synthesis step, check the box below the drawing area instead. Note for advanced students: if you have a choice of reagents to add, you should choose the least reactive and most economical reagents possible. Cl It isn't possible to do this reaction in a single synthesis step. + T OHarrow_forwardPredict the products of this organic reaction: CH3 O CH3-CH-C-O-CH2-CH2-CH3 + H₂OH+ Η ? A Specifically, in the drawing area below draw the condensed structure of the product, or products, of this reaction. (If there's more than one product, draw them in any arrangement you like, so long as they aren't touching.) If there aren't any products because this reaction won't happen, check the No reaction box under the drawing area. No Reaction Click anywhere to draw the first atom of your structure.arrow_forward€ CH3-CH-C-O-CH2-CH2-CH3 + NaOH A? Specifically, in the drawing area below draw the condensed structure of the product, or products, of this reaction. (If there's more than one product, draw them in any arrangement you like, so long as they aren't touching.) If there aren't any products because this reaction won't happen, check the No reaction box under the drawing area. Predict the products of this organic reaction: CH3 O Click anywhere to draw the first atom of your structure. No reaction ✓ Garrow_forward
- A molecule can have a temporary or permanent depending on the structure and the way the electrons can move. True Falsearrow_forwardedict the products of this organic reaction: CH3 O A CH3-CH-C-NH2 + H2O + HCI ? Specifically, in the drawing area below draw the condensed structure of the product, or products, of this reaction. If there's more than one product, draw them in any arrangement you like, so long as they aren't touching. If there aren't any products because this reaction won't happen, check the No reaction box under the drawing area. Click anywhere to draw the first atom of your structure. No Reaction planation Check 2025 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy Center +arrow_forwardDraw the mechanism for the following reaction: OH A few notes: CI O • You may assume that each reagent is present in whatever amount you need to draw your mechanism. • To save you some time, one of the starting materials has been copied into the first step of the drawing area. AP Add/Remove step Cl Click and drag to start drawing a structure.arrow_forward
- What is the missing reactant in this organic reaction? CH3 O [0] R CH3-CH-C-OH Specifically, in the drawing area below draw the condensed structure of R. If there is more than one reasonable answer, you can draw any one of them. If there is no reasonable answer, check the No answer box under the drawing area. Note: the organic equation above only shows the important organic reactant and product. Minor small-molecule reactants or products (like H₂O) are not shown. No Answer Click anywhere to draw the first atom of your structure. ×arrow_forwardPredict the product of this organic reaction: O CH3 A NH3 + HO–C—CH—CH, P+H₂O Specifically, in the drawing area below draw the condensed structure of P. If there is no reasonable possibility for P, check the No answer box under the drawing area. No Answer Click anywhere to draw the first atom of your structure. A 5arrow_forwardFor a reaction to be spontaneous, the Gibbs Free Energy must be less than zero. True or Falsearrow_forward
- Which of the following reactions will be exothermic? a) Reaction has enthalpy less than zero. b) Reaction has enthalpy greater than zero. c) Reaction has entropy less than zero. d) Reaction has entropy equal to zero.arrow_forwardHow many valence electrons are used in predicting the Lewis Dot structure of CH4? a) 8 b) 6 c) 10 d) 2arrow_forwardHow many valence electrons are used in predicting the Lewis Dot structure of CO2? a) 32 b) 26 c) 24 d) 16arrow_forward
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