How would you use a radioactive isotope to find out if the oxygen in the CO2 comes from sugar or oxygen gas in?
Q. Question 1. Animals obtain energy through a series of chemical reactions in which sugar (C6H12) & oxygen gas (O2) are reactants. This process produces water (H2O) and carbon dioxide (CO2) as waste products. How might you use a radioactive isotope to find out whether the oxygen in CO2 comes from sugar or oxygen gas?
Asked by A P - Sat Dec 12 23:09:01 2009 - Chemistry - 1 Answers - Comments

A. Since the vast majority of oxygen atoms found in nature are not radioactive, if there is a radioactive isotope of oxygen available, have the animal breathe this isotope of oxygen, then collect and check to see if the CO2 exhaled contains the radioactive oxygen. If it does, the O in the CO2 came from the radioactive O2 used, if it does not, then the O in the CO2 came from the O in the sugar. By the way, the sugar is probably C6H12O6, or something like that.
Answered by Flying Dragon - Sat Dec 12 23:45:21 2009

How many protons and neutrons are in each isotope of chlorine?
Q. the whole question : Chlorine-35 is one isotope of chlorine. (35 is the mass number) chlorine-37 is another isotope of chlorine. How many protons and neutrons are in each isotope of chlorine? i have it answered but idk if its right
Asked by nothinbutnet2009 - Tue Sep 11 17:26:44 2007 - Chemistry - 4 Answers - Comments

A. Cl-35: 17 protons, 18 neutrons Cl-37: 17 protons, 20 neutrons
Answered by steve_geo1 - Tue Sep 11 17:31:47 2007

How would you calculate the percentages of each isotope?
Q. Boron has only two isotopes, 10B with a mass of 10.0129 and 11B with a mass of 11.0093. If the average atomic mass of boron is 10.810, what are the percentages of each isotope? -I don't really understand what this is asking for. Is it asking for the natural abundance? How would you solve this? Thank you!
Asked by Live_laugh_love - Mon Oct 27 17:47:29 2008 - Homework Help - 1 Answers - Comments

A. Let percentage of Isotope 10B be x then percentage of isotope 11B will be (100-x) The average atomic mass is 10.81, therefore the following equation will be true: (10.0129x + 11.0093(100-x)) / 100 = 10.81 Solving for the value of x we will get x=20% Therefore the % of isotope 10B will be 20% and % of isotope 11B will be 80%
Answered by Ashish A - Mon Oct 27 17:59:50 2008

How long will it take for this isotope to decay to about 1/16 its original amount?
Q. This is for my college physical science class. The problem is stated as follows the isotope of cesium 137, which has a half life of 30 years, is a product of nuclear power plants. Then the question above.
Asked by AZN Guy - Fri Oct 22 13:53:12 2010 - Chemistry - 3 Answers - Comments

A. For every half-life that passes, the remaining amount decreases by 1/2. So after 30 years, there would be 1/2 of the original amount remaining. After another 30 years (60 years total), there would be 1/4 remaining. After 90 years there would be 1/8 remaining. After 120 years there would be 1/16 remaining. I hope that helps. Good luck!
Answered by Lucas C - Fri Oct 22 13:59:28 2010

How long would it take a sample of this isotope to decay to just 51.467% of its original activity?
Q. The isotope 228-Ra has a half life of 1602 years. How long would it take a sample of this isotope to decay to just 51.467% of its original activity?
Asked by Linda B - Tue Apr 1 08:06:50 2008 - Chemistry - 1 Answers - Comments

A. halflife is 1602 years, or decay of 50% of activity if x is the original activity after 1602 years--- x/2 remains needs to decay 2(1.46%) by ratio and proportion 1602/50= y/(2*1.467) y=94 years total years= 1602+94 = 1696 yrs( ans)
Answered by Bing - Tue Apr 1 08:26:16 2008

The half-life of a certain radioactive isotope is 6 h. If we start out with 10 g of the isotope, after 1 day t?
Q. The half-life of a certain radioactive isotope is 6 h. If we start out with 10 g of the isotope, after 1 day there will be?
Asked by Michelle - Sun Mar 14 14:36:56 2010 - Chemistry - 4 Answers - Comments

A. If you have 10g and the half life is 6 hours it means that after 6 hours you'll only have 5 g. 1 day is 24 hours which is 6x4 so you have undergone 4 half lives. 10=>5=>2.5=>1.25=>0.625g You should use this equation: final amount = initial amount / (2^(time/half life)) as this can be use in all cases, even the most complicated so for your example you have: final amount = 10 / (2^(24/6)) = 10/(2^4) = 10/16 = 0.625
Answered by Kittycetty - Sun Mar 14 14:45:23 2010

What is the isotope symbol for atoms that contain the following numbers of subatomic particles?
Q. What is the isotope symbol for atoms that contain the following numbers of subatomic particles? a. 2 protons and 1 neutron b. 47 protons and 62 neutrons c. 82 protons and 125 neutrons I said: a. Helium-1 b.Silver-62 c.Lead-125 Am I right?
Asked by jle1092 - Thu Feb 10 11:52:41 2011 - Chemistry - 1 Answers - Comments

A. He-3 Ag-109 Pb-207
Answered by Soc the Poetic Chemist - Thu Feb 10 12:18:26 2011

How might you use radioactive isotope to find out whether the oxygen in CO2 comes from sugar or oxygen gas?
Q. Animals obtain energy through a series of chemical reactions in which sugar (C6H12O6) and oxygen gas (O2) are reactants. This process produces water (H20) and carbon dioxide (CO2) as waste products. Suppose you wanted to find out whether the oxygen in CO2 come from sugar or oxygen gas. How might you use a radioactive isotope to find out?
Asked by Just a Student - Sun Feb 17 16:42:29 2008 - Biology - 1 Answers - Comments

A. You can replace the oxygen gas (O2) of the reactants with a radioactive isotope. If the CO2 product is radioactive, then the oxygen came from the O2, if not then the oxygen came from the sugar.
Answered by Yuki - Sun Feb 17 16:52:58 2008

How to find an isotope of an element when given the number of protons, neutrons, and electrons?
Q. For example... Protons- 35 Electrons- 36 Neutrons- 45 Would the isotope of that element be 80Br +9? This is the answer I got, but I would like to know how to get to this answer using the information given above. Thanks in advance! If its one less electron, than it would be +1?
Asked by Makenna - Mon Jan 17 16:09:52 2011 - Chemistry - 1 Answers - Comments

A. 80Br -1 Protons are positively charged, electrons are negatively charged. They cancel out one another's charge in a 1:1 ratio. There is 1 more electron that there is protons therefore one electrons negative charge isn't being cancelled out, making it -1. Regarding additional information: Yes, if there was one less electron than proton it would be +1, you've got it :)
Answered by i-Nick-on-a-mission-! - Mon Jan 17 16:15:24 2011

How do I determine what isotope is formed if an element is a positron emitter or an alpha emitter?
Q. example: Th-223 is an alpha emitter. What isotope is formed when Th-223 emits an alpha particle? example: As-74 is a positron emitter. What isotope is formed As-74 emits a positron?
Asked by dasmama101 - Sun Nov 9 13:16:28 2008 - Chemistry - 2 Answers - Comments

A. An alpha particle consists of two neutrons and two protons, so if it is emitted from the nucleus then the mass number goes down by four and the atomic number by two. Positrons have charge +1, but essentially contribute nothing to the mass, so the mass number is unchanged but the atomic number goes down by one.
Answered by pegminer - Sun Nov 9 13:21:42 2008

What is a negative isotope that is created by nuclear power plants?
Q. Does anyone know a negative isotope created by nuclear power plants, that damages the environment / human health?
Asked by John L - Fri Mar 27 22:09:04 2009 - Physics - 1 Answers - Comments

A. I'm not sure what you mean by negative isotope, so I can't answer that part of the question. But there are plenty of isotopes created nuclear power plants that are detrimental to human health. In fact, anything radioactive is potentially bad for human health, and a nuclear reactor creates a lot of radioactive isotopes. Most of the dangerous materials are contained in the fuel elements of the reactor, although some are intentionally created outside of the fuel for research or practical purposes (for example, Co-60 is often created since it's useful for medical applications). One of the biggest concerns for reactors is the release of tritium, which is an isotope of hydrogen. Although it's half life is relatively short, so its not as… [cont.]
Answered by Call me Batman - Fri Mar 27 22:34:06 2009

What is the atomic number and the mass number of this isotope of geranium?
Q. An isotope of geranium has 32 protons and 46 neutrons in the nucleus. What is the atomic number and the mass number of this isotope of geranium?
Asked by dark matter - Mon Dec 14 14:28:35 2009 - Chemistry - 2 Answers - Comments

A. the atomic number is 32, and the atomic mass is 32+46
Answered by Doc89891 - Mon Dec 14 14:34:51 2009

How may protons, neutrons and electrons would an atom of this isotope have?
Q. One isotope of Hydrogen has an atomic number of one and a mass number of three. How many protons, neutrons and electrons does this isotope have?
Asked by jeff m - Tue May 27 15:14:22 2008 - Chemistry - 3 Answers - Comments

A. There is no isotope of hydrogen with that weight. With two neutrons its weight is 3.0160492675 If you remove its lone electron of about .0005446623 That leaves an atomic weight of about 3.0155046 This isotope is called tritium and is too heavy for your answer of 3. However, with a little rounding, it may serve.
Answered by Tom1564 - Tue May 27 15:29:15 2008

What is the most abundant isotope of oxygen?
Q. Why is it the most abundant? How can you tell which isotope is the most abundant?
Asked by bhabiie_xiv - Wed Oct 1 01:18:37 2008 - Chemistry - 3 Answers - Comments

A. O16. The atomic mass is close to the mass number of the most abundant isotope. For example, the atomic weight of oxygen is 15.994 is closest to O16, others being O17 and O18.
Answered by DocA - Wed Oct 1 01:26:12 2008

What does it mean to be compared to a Radioactive Isotope ?
Q. At work we were discussing who would be the proton, neutron, and electron. A male co-worker told me I would be the radioactive isotope. I asked him to explain but he wouldn't. What does it mean to be told you would be the Radioactive isotope?
Asked by Desiree' J - Fri Apr 20 08:53:09 2007 - Physics - 1 Answers - Comments

A. Unstable? No offense, just the only connection I could think of.
Answered by KD - Fri Apr 20 09:00:27 2007

How is a radioactive isotope of strontium related to calcium on the periodic tabl?
Q. A radioactive isotope of strontium is especially dangerous to humans b/c it accumulates in the bone marrow. How does this relate to calcium on the periodic table? Choices 1. Compared to Calcium strontium has 18 more electrons to hurt you 2. They are in the same group hence similiar physical and chemical properties 3. Strontium has over twice the mass of calcium
Asked by shannon w - Mon Apr 13 21:45:39 2009 - Chemistry - 2 Answers - Comments

A. The fact that Sr is in the same family as Ca means that it reacts similar to Ca. It can concentrate in the bones, just like Ca. That is bad since Sr is radioacitve and the radiation it gives off can cause bone cancer.
Answered by Chem Man - Mon Apr 13 21:51:34 2009

What is the most common isotope for Gandolinium?
Q. I just want to know because I have this question that is asking me if Gandolinium-153 is the most common isotope. It's important and thanks.
Asked by Nina Ochoa - Wed Nov 17 00:09:07 2010 - Chemistry - 2 Answers - Comments

A certain isotope of technetium has a half-life of six hours. Technetium is used in medical procedures such as?
Q. A certain isotope of technetium has a half-life of six hours. Technetium is used in medical procedures such as stress tests on the heart. What fraction of an initial dose remains in the body after 24 hours? Show the calculation.
Asked by 13 - Tue Nov 22 16:28:08 2011 - Physics - 1 Answers - Comments

How do I determine the mass of the third isotope?
Q. The question that I am stuck on is: Magnesium has three naturally occuring isotopes: 24Mg (23.9850 amu) with 78.99% abundance, 25Mg (24.9858 amu) with 10.00% abundance, and a third isotope with 11.01% abundance. Determine the mass of the third isotope. How do I do this and what is the answer please?
Asked by tdevil182 - Wed May 9 17:09:10 2007 - Chemistry - Answers - Comments

A. On the periodic table, the mass of magnesium is 24.3050 amu. This is the average mass of naturally occurring magnesium. You can write an equation with the percentages of abundance of all of the three isotopes. This should add up to the average mass. Let M be the mass of the third isotope. 24.3050 = (0.7899)(23.9850) + (0.1000)(24.9858) + (0.1101)(M) Simplifying, M = 25.9824 amu
Answered by Snowfire - Sun May 13 15:09:14 2007

What is the relative abundance of the lighter isotope?
Q. the bigger part: if the mass of the only 2 isotopes of an element are 126.6331u and 129.1386u and the weighted average mass is 127.3321u , what is the relative abundance of the lighter isotope? please, i need the answer tonight! please help me. i'm really confused. Thank You So Much.
Asked by - Wed Aug 5 01:32:30 2009 - Chemistry - 1 Answers - Comments

A. Hi Marielle: Let x be the fraction of the lighter isotope then 126.6331x is the contribution the light isotope makes to the overall atomic weight. The remaining fraction (1-x) therefore contributes 129.1386(1-x) to the atomic weight which we are given = 127.3321 So 126.6331x + 129.1386(1-x) = 127.3371 From which x = 1.8065/2.5055 = 0.721014 or 72.1014% (we're 1 sig short but ...) cheers, drp
Answered by Mr Praline - Wed Aug 5 01:47:03 2009