2. If a sample known to be about 17190 years old has 400 carbon-14 atoms, how many atoms were in the sample when the organism died? Half-life of C-14 is 5730 years.

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...
icon
Related questions
Question
I need help with number 2
6:45 9
Untitled document (75).pdf
Honors Physics: Test 2, March15,22
Directions: Show your work by including tables, mathematical formulas, and necessary units.
1. If the "N" number of atoms of a radioactive substance had decayed to 25 atoms in five
half-lives, what was the original number of atoms in the substance?
2. If a sample known to be about 17190 years old has 400 carbon-14 atoms, how many
atoms were in the sample when the organism died? Half-life of C-14 is 5730 years.
3. If we start with 64 grams of a radioactive substance, what percent will remain after four
half-lives?
4. How old is a bone if it presently contains 0.125 gm of C-14, but it was estimated to have
originally contained 160 gm of C-14.? The half-life of C-14 is 5730 years.
5. What is the half-life of a radioactive isotope if a 600 gm sample decays to 48 grams in 27
hours?
6. The formula of converting temperature from Celsius to Fahrenheit is:
" = 1.8x c° + 32. and the formula for converting Celsius to Kelvin scale is:
K=+ 273.
(a) Convert these Fahrenheit scales to Celsius scales: 70"F, 180°F, and 18°F
(b) Convert these Celsius scales to Kelvin scales: 20°C; 100°C; 160°c
(c) Convert this Fahrenheit scale to Kelvin scale: 140"F.
7. The temperature of a substance changes from 300°F to 400°F. What is the equivalent
change in Kelvin scale?
8. A student measures the mass of a 12 cm - block of brown sugar is 15 gm
What is the density of the brown sugar?
9. A machine shop worker records the mass of an aluminum cube as 170 gm. If one side of
the cube measures 6 cm, what is the density of the aluminum?
10. A substance has a volume of1 cubic meter and density of 3kg/m'. What would be its
mass in grams. (Hint convert kg to gram and meter to centimeter and then use the
density formula, which is: Density= Mass/Volume
(1m =100 cm;
1 kg -1000 gm)
11. The dimensions of a block are 12cm, 6cm, and "X" cm. Assuming the block has a mass
of 12 kg and its density is 4 kg/m'. What is the value of "X" in meters? (Hint: Change
centimeters to meters and then use the density formula, which is: Density-Mass/Volume
12. An oscillator makes four vibrations in one second, what is its frequency and period?
Transcribed Image Text:6:45 9 Untitled document (75).pdf Honors Physics: Test 2, March15,22 Directions: Show your work by including tables, mathematical formulas, and necessary units. 1. If the "N" number of atoms of a radioactive substance had decayed to 25 atoms in five half-lives, what was the original number of atoms in the substance? 2. If a sample known to be about 17190 years old has 400 carbon-14 atoms, how many atoms were in the sample when the organism died? Half-life of C-14 is 5730 years. 3. If we start with 64 grams of a radioactive substance, what percent will remain after four half-lives? 4. How old is a bone if it presently contains 0.125 gm of C-14, but it was estimated to have originally contained 160 gm of C-14.? The half-life of C-14 is 5730 years. 5. What is the half-life of a radioactive isotope if a 600 gm sample decays to 48 grams in 27 hours? 6. The formula of converting temperature from Celsius to Fahrenheit is: " = 1.8x c° + 32. and the formula for converting Celsius to Kelvin scale is: K=+ 273. (a) Convert these Fahrenheit scales to Celsius scales: 70"F, 180°F, and 18°F (b) Convert these Celsius scales to Kelvin scales: 20°C; 100°C; 160°c (c) Convert this Fahrenheit scale to Kelvin scale: 140"F. 7. The temperature of a substance changes from 300°F to 400°F. What is the equivalent change in Kelvin scale? 8. A student measures the mass of a 12 cm - block of brown sugar is 15 gm What is the density of the brown sugar? 9. A machine shop worker records the mass of an aluminum cube as 170 gm. If one side of the cube measures 6 cm, what is the density of the aluminum? 10. A substance has a volume of1 cubic meter and density of 3kg/m'. What would be its mass in grams. (Hint convert kg to gram and meter to centimeter and then use the density formula, which is: Density= Mass/Volume (1m =100 cm; 1 kg -1000 gm) 11. The dimensions of a block are 12cm, 6cm, and "X" cm. Assuming the block has a mass of 12 kg and its density is 4 kg/m'. What is the value of "X" in meters? (Hint: Change centimeters to meters and then use the density formula, which is: Density-Mass/Volume 12. An oscillator makes four vibrations in one second, what is its frequency and period?
Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 2 steps

Blurred answer
Knowledge Booster
Dating Techniques
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.
Recommended textbooks for you
Chemistry
Chemistry
Chemistry
ISBN:
9781305957404
Author:
Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:
Cengage Learning
Chemistry
Chemistry
Chemistry
ISBN:
9781259911156
Author:
Raymond Chang Dr., Jason Overby Professor
Publisher:
McGraw-Hill Education
Principles of Instrumental Analysis
Principles of Instrumental Analysis
Chemistry
ISBN:
9781305577213
Author:
Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:
Cengage Learning
Organic Chemistry
Organic Chemistry
Chemistry
ISBN:
9780078021558
Author:
Janice Gorzynski Smith Dr.
Publisher:
McGraw-Hill Education
Chemistry: Principles and Reactions
Chemistry: Principles and Reactions
Chemistry
ISBN:
9781305079373
Author:
William L. Masterton, Cecile N. Hurley
Publisher:
Cengage Learning
Elementary Principles of Chemical Processes, Bind…
Elementary Principles of Chemical Processes, Bind…
Chemistry
ISBN:
9781118431221
Author:
Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard
Publisher:
WILEY