University:
University of Colorado Boulder
Course:
CHEM 1133 | General Chemistry 2
Academic year:

2015
Views:

468

Pages:

4
Author:

Friniarot77x8

m Chapter 10 Reading Questions 2015 |ccm>r Name 0 Section 4 Fission and Fusion , pg 308- 315 ( due Monday 11 / 16 ) 1. What two particles make up the nucleus? What is the mass of each particle ? What is the charge of each particle? P. 308 „ / - p* nucleus /1 t IA° each ) 2. How are these two particles attracted to each other in the nucleus? Is this forc stronger than the electric force? Is this force(shor t - rangeSpr long- range? P 308 S4rcna nucicar drs xdon ^ 3. Are larger c ( ^^ -force - doesn t &JZ vi° cyml Vio+ h ^ , ' OFV weaker charge so . j nuclei held together more oCjessTHghthjthan smaller nuclei? Why is this in terms of th a strong force and the electric force ? P. 309 TWAK LU \ V\ ucl t > ~ SkonQ ? KJUAUOOTS -e fchlu m packo . , J frbrc evectrto -irDr J' ' \o , ^ 4. When the nucleus is held together, the nucleus is ^ hold the nucleus together? P. 309 | | f| ha£{Ccvv \ |\ nucleus Voi vysy " / air ^ ^ renrne ( f AeUcArf ' close ^ - as ^ - ^s ftve \ therms f , v ^ msr ksbrn m mcrm £? rc <^ ra /A ^ Qbebrto ' 5. Atoms of the same element always have the same # X>dr neutrons, they are called \ SOT~nPQ-S ^ y\ o pmtem: . If an element has a different number of 6. Isotopes of elements differ in the ratio of neutrons to protons. This ratio is related to the STZ\D i 1 of the nucleus. What is the ratio of neutrons to protons in less massive elements? What is the ratio of neutrons to protons in heavier elements? \ C fv ic # 4 ba 3A tUiYWVt L d&apeaSCs- mass bu 4 Amu \ T - ChAHi eS t ^ *>* tc Ac tin >n • mass dmc. rVWm ’f ' TAUS 3. The most penetrating form of radiation are yrvxfvm piraiA 7 . 265 ^ P carry , v \ £ and they called electromagnetic waves Q ' ' /\ J 7 . , They are a form of radiation . 4. As atoms decay, they are changed from one element to another through a process called transmutation. The following picture shows this process. Looking at the picture above, Uranium - 238 decays (eventually ) into Lead - 206. Why does Lead - 206 ( Pb 206) no longer decay? - .a . 234 23« u 234 234 230 218 Po 214 214 U Pa Th \ Th a ' 226 a a a a \ 2U Pd 210 Pts 210 210 Pa SKM) , lowing how uranium | (| decays to tead and point where helium ( a ) Is given off. / / / y y Remember, emitting alpha particles and beta particles changes the element but in different ways. Section 2 Half- Life, pg. 298- 301 ( due Tuesday 11 / 17 ) 1. What is a half - life ? Are all half -lives the same? What are the ranges of time your book gives you ? P. 299 ' - Vl Ui^ avviouKvf of 4IAAW -for hot if fpe nucLoi 4 Samp e io ci OrYV5- cx\RJ? U 5 3 - fhd thousamitU op A &? con vSome Arc biH » ohs of f ' * ^ : 2. How are nuclear decay rates different from chemical reaction rates? P. 299 nuclear dpraiA r^ ks aw cons’hutd- 3. What is radioactive dating? Why do scientists use it? P. 300 " dcrhn« of fcncUs bo&>d OA PAOLOW Vwl-f - ( t Amonnf of mf iso fo isofop half - 1 -Mui-hplu Half - Life Practice Problems: (due Wednesday 11 / 18) W for -Hvcf compare rm- par^ - 4 of ^ pe tfhqtAliws 1. What percentage of a radioactive element will be left after: a. 1 half - life pQ /. b. 2 half- lives 5/5 / c. 3 half - lives ^ ^HAAsbrt^ . I kuxlPd fi la.sP 2. How many half - lives have passed for each of the following samples: a. 50% of the original radioactive material remains b. 25% of the original radioactive sample remains c. 12.5% of the original radioactive sample remains > a = 3. If a rock sample originally contained 12 g of Uranium - 235, how much will be left after: a. 1 half - life Co 9 b. 2 half - lives 1 j c. 3 half -lives i - S9 4. Uranium- 235 has a half - life of 700 million years. How much of the 12 g sample of Uranium - 235 will be left after : a. 700 million years ^ b. 1400 million years 35 5. Carbon -14 is a radioactive element that decays into Nitrogen - 14. The half - life of Carbon -14 is 5730 years. What percentage of Carbon -14 and Nitrogen -14 will be left in a dinosaur bone after: 5730 years: 50'/ % of Carbon -14 «35 / So / - loo / % of Nitrogen - 14 i s r - loo / % of Carbon -14 &. S / % of Nitrogen -14 STS 7 / 00 / % of Carbon-14 11, 580 years: ^ 17,310 years: ^ % of Nitrogen-14 3 type of 6. If the dinosaur bone in question 5 originally had 16 grams of Carbon -14 in it how much of each element should be left after : Grams of Nitrogen- 14 5730 years: Grams of Carbon -14 C 6 _ 11, 580 years: Grams of Carbon -14 4 17 , 310 years: Grams of Carbon -14 <4 Grams of Nitrogen -14 hA " J Grams of Nitrogen -14 14 0 -14 7 . More dinosaur bones are found and examined . If they contain the following percentages of Carbon and Nitrogen -14 how old are each of the bones? Bone # 1: 50 % Carbon -14 and 50 % Nitrogen - 14 4 i b0 Bone # 2: 25 % Carbon -14 and 75% Nitrogen -14 ) \ , Air> 0 years old Bone # 3 : 12.5 % Carbon -14 and 87.5% Nitrogen -14 l 1 , 1 ^10 years old ' years old half 8. Scientists have recently discovered a new type of radioactive element. They have measured its graph life and know it takes 10,000 years to decay. Use their data in the table below to plot a line on the below. / GO Number of Half Lives 0 1 2 3 4 % of Unstable Atom Remaining 100 50 25 12.5 6.25 3.125 5 l) T0 £t 5° £ 4-0 \A " 30 \ ID 3 O A. 5 ^^ 4 ' I i D- f i, half - lives have passed ? many How . remaining 9 . A fossil bone has 25 % of this new radioactive element A 10. If the half - life of this new element is 10 ,000 years, how old is the fossil bone in question 9? QtO , ooo urs 4

Reading Questions 2015

Related Documents

Recommended Documents

Description

Related Documents

Free up your schedule!

Take 5 seconds to unlock