In the parts that follow, use the following abbreviations for timeMeasure of timeminuteshoursdaysyears▼Part APart BYou are using a Geiger counter to measure the activity of a radioactive substance over thecourse of several minutes. If the reading of 400. counts has diminished to 100. counts after44.4 minutes, what is the half-life of this substance?Express your answer with the appropriate units.Units of timeminPart ChdyrAn unknown radioactive substance has a half-life of 3.20 hours. If 47.4 g of the substance iscurrently present, what mass Ao was present 8.00 hours ago?Express your answer with the appropriate units.Part DAmericium-241 is used in some smoke detectors. It is an alpha emitter with a half-life of 432years. How long will it take in years for 37.0 % of an Am-241 sample to decay?Express your answer with the appropriate units.A fossil was analyzed and determined to have a carbon-14 level that is 50 % that of livingorganisms. The half-life of C-14 is 5730 years. How old is the fossil?Express your answer with the appropriate units.

Dear student , since you have posted multiple parts questions we are allowed to solve only first…

You are using a Geiger counter to measure the activity of a radioactive substance over the course of several minutes. If the reading of 400. counts has diminished to 100. counts after 44.4 minutes, what is the half-life of this substance? Express your answer with the appropriate units.

You are using a Geiger counter to measure the activity of a radioactive substance over the course of several minutes. If the reading of 400. counts has diminished to 100. counts after 44.4 minutes, what is the half-life of this substance? Express your answer with the appropriate units.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

See similar textbooks

Similar questions

Suppose the amount of a certain radioactive substance in a sample decays from 5.30mg to 1.40mg over a period of 18.6 days. Calculate the half life of the substance. Round your answer to 2 significant digits.
A radioactive sample contains 1.85 g of an isotope with a half-life of 3.5 days. What mass of the isotope will remain after 5.5 days? (Assume no excretion of the nuclide from the body.) Express your answer using two significant figures.
Precise measurements give the following masses: nuclide mass ²H 2.0141 u il He 4.0026 u 3.0161 u particle In - ie 0 e Now consider the following nuclear reaction: H + H → He + n Is energy released or absorbed by this reaction? 1.0086649 u 4 5.4858 × 10 u 5.4858× 10-4 u mass If you said energy was released or absorbed, calculate how much energy is released or absorbed. Give your answer in both kJ/mol and MeV. Round each of your answers to 3 significant digits. Note: take particular care to keep enough digits in any intermediate calculation, and use enough digits in any scientific constants you need, since the data with which you are working are very precise. released absorbed neither released nor absorbed I need more information to decide. kJ/mol Mev x10 X
Identify the unknown particle X in the following nuclear reaction equations. (Enter your answers in the form A X Z 10n + 2713Al → X + 42He 11H + 189F → 158O + X 42He + X → 2512Mg + 10n 10n + 23592U → 13855Cs + X + 2 10n Identify the unknown particle X in the following equation for fission. (Enter your answer in the form A X Z .) 23692U → X + 9436Kr + 3 10n
Ruthenium-106 (106Ru) is used to treat melanoma in the eye. This isotope decays by β– emission with a half-life of 373.59 days. One source of the isotope is reprocessed nuclear reactor fuel. How many protons and neutrons does the 106Ru nucleus contain? Identify the missing daughter nucleus in the β– emission decay of 106Ru below. How many years after 106Ru is implanted in the eye does it take for its decay rate (or activity) to be reduced to 27.5% of the initial decay rate? Use 1 year = 365 days.
35S → Mod 8-converted.pdf 1. Write an equation showing the emission of an alpha particle by an isotope of neptunium, 23NP, to produce an isotope of protactinium. (REFER TO EXAMPLE 1) 2. Write an equation showing the emission of a beta particle by sulfur-35, 35S, to produce an isotope of chlorine. (REFER TO EXAMPLE 1) 3. Complete these nuclear equations by filling in the missing symbol, mass number and atomic number of the product series. (REFER TO EXAMPLE 2) 16 (a) ¿C → 1B + ? (b) ES → ci+ ? 35 17 (c) P → +9e + ? 30 15 (d) Na → -je + ? 22 11 ト Iト咕5 目目 17 / 17 耳 e FOP
Macmillan l 30: F2 W S A 210.2 ng sample of an unknown radioactive substance was placed in storage and its mass measured periodically. After 47 days the amount of radioactive substance had decreased to 26.28 ng. How many half-lives of the unknown radioactive substance have occurred? number of half-lives: #3 H 80 F3 mmand E D A GA $ X C 4 OOD 886 F4 R F % от ото 5 V F5 T G ^ 6 B F6 Y & 7 H 8 F7 U N 00 * 8 DII FB J L - ( 9 M K DD F9 O . V - ... I 4 F11 { [ option + = ? 11 1 F12 } ] half-lives delete return st
A radioactive isotope has a half-life of 84.5 minutes. How long will it take for the radiation from a 450 PCI sample to decrease to 28 PCI
Bi – 210 is a beta emitter with a half-life of 5.0 days. Part A If a sample contains 2.1 g of Bi – 210, how many beta emissions would ocur in 5.0 days? Express your answer using two significant figures. Πνα ΑΣφ N= beta emissions Submit Previous Answers Request Answer X Incorrect; Try Again; 5 attempts remaining Provide Feedback MacBook Air
1. Complete the following nuclear equations. Indicate the symbol, the mass number, and the atomic number of the unknown particle. ? 181 131 (a) 331 → ß + ? (b) 74 W + °e → ? → '"N + ? (d) Sr → ? 90 (c) 0 → + -iß; 38 (e) ? 226 Ra + He; 239 Pu → ? +He; Не; 88 94 (g) U + ¿n –→ " 90 Sr + ? _ + 3,n; (h) 2Cf → 193zr + ? + 4;n 92 38
Identification and Characterization of Unstable and Stable Nuclei Nuclear stability can in general be predicted based on the following considerations: • Nuclei with 84 protons or more are unstable. • Nuclei containing a magic number of protons and/or neutrons tend to be stable. • Stable nuclei often contain even numbers of protons and/or neutrons. These factors are reflected in the given graph (Figure 1). which shows the valley of stability as a function of number of neutrons and protons. Figure Number of neutrons 110 100 90 80 70 60 50 40 30 20 10 0 0 www Belt of stability 10 1:1 neutron-to- proton ratio 20 30 40 50 60 70 80 Number of protons 1 of 1 "Magic" numbers A magic number is the name given to certain numbers of protons or neutrons that have a high correlation to stability in nuclei: magic numbers of protons: 2, 8, 20, 28, 50, 82 magic numbers of neutrons: 2, 8, 20, 28, 50, 82, 126, 184 ▼ A plot of the number of neutrons versus the number of protons for all known stable nuclei,…
Identiy the missing particle in the following nuclear equation. Please help! How do i DO THIS?