Chemistry HElp needed Please thanks?

Question

1. The nucleus contains tightly held protons and neutrons that are held together by nuclear forces. The protons remain close together in the nucleus because the _____ that hold the protons together is _____ than the _____ that _____ them.

A. nuclear force, stronger, electromagnetic force, repels

B. nuclear force, weaker, electromagnetic force, attracts

C. electromagnetic force, stronger, nuclear force, repels

2. What product(s) is (are) produced when 232 90 Th undergoes alpha decay?

A. 4 2 He

B. 228 88 Ra

C. 23086 Rn

D. 2 4 He

3. Match the following radioactive decay particles with its correct symbol.

1. 0 -1 e

2. 0 0 γ

3. 4 2 He

1 2 3 A. Alpha

1 2 3 B. Beta

1 2 3 C. Gamma

4. Match the following radioactive decay particle with the substance that is used to stop it from penetrating the skin.

1. Lead

2. Aluminum

3. Paper

1 2 3 A. :Alpha

1 2 3 B. :Beta

1 2 3 C. :Gamma

5. 15 7 N is a radioactive isotope of nitrogen.

True False

6. If 234 90 Th was produced from the decay of 238 92 U, what was the radioactive decay particle that was emitted?

A. 238 92 U

B. 234 90 Th

C. 4 2 He

D. None of the above

7. What was the reactant that underwent beta decay if 14 7 N was the product?

A. 14 6 C

B. 14 7 N

C. 0 -1 e

D. None of the above

8. Nuclear fusion reactions are referred to as “clean” nuclear energy because of the fact that they do not produce large amounts of radioactive waste. In a nuclear fusion reaction, the energy comes from the mass difference of the ___ nuclei being combined to form ___ nuclei. The mass difference between the reactants and products is the ___ that is converted into ___

A. lighter, heavier, mass, energy

B. heavier, lighter, mass, energy

C. lighter, heavier, energy, mass

D. heavier, lighter, energy, mass

9. Atoms do not break apart into protons and neutrons because the ___ forces between nucleons are stronger than the ___ forces.

A. electromagnetic, nuclear

B. nuclear, electromagnetic

C. both forces are the same strength

D. not enough information given to answer the question

10. What are some uses of nuclear reactions?

A. Carbon dating

B. Power plants

C. Smoke detectors

D. All of the above

11. What is the spontaneous disintegration in which particles and/or electromagnetic radiation are emitted?

A. radioactivity

B. nuclear energy

C. fission

D. fusion

12. Who discovered radioactivity?

A. Marie Curie

B. Pierre Curie

C. Henri Becquerel

D. Einstein

13. What is the length of time it takes for half of the atoms in a given radioactive sample to decay?

A. half-life

B. radioactivity

C. radioactive decay

D. half-decay

14. Which of the following is a type of nuclear radiation?

A. alpha particle

B. beta particle

C. gamma particle

D. all of the above

15. What is the change in the identity of a nucleus because of a difference in proton number?

A. Nuclide

B. Transmutation

C. Beta decay

D. Neutron emission

16. What is the binding energy per nucleon of Au-197 (atomic mass = 3.2696 x 10-25kg)?

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17. Write the properly balanced beta decay equation indicating the resulting products: Tc4399® ? + ? + ?

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18. Write the properly balanced alpha decay equation indicating the resulting products: Po 84210 ® ? + ?

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Answer 1

1. The nucleus contains tightly held protons and neutrons that are held together by nuclear forces. The protons remain close together in the nucleus because the _____ that hold the protons together is _____ than the _____ that _____ them.

A. nuclear force, stronger, electromagnetic force, repels

===============================

2. What product(s) is (are) produced when 232/ 90 Th undergoes alpha decay?

B. 228 88 Ra

==============================

3. Match the following radioactive decay particles with its correct symbol.

1. 0 -1 e

2. 0 0 γ

3. 4 2 He

#3 is an  A. Alpha

#1 is a  B. Beta

#2  is C. Gamma

====================================

4. Match the following radioactive decay particle with the substance that is used to stop it from penetrating the skin.

1. Lead

2. Aluminum

3. Paper

3. paper is used to stop alpha  A. :Alpha

2, aluminum is used to stop beta  B. :Beta

1. lead is used to stop gamma C. :Gamma

==========================

5. 15 7 N is a radioactive isotope of nitrogen.

False, though it is an isotope of nitrogen ,... it is stable

http://ie.lbl.gov/education/parent/N_iso...

=============================

6. If 234 90 Th was produced from the decay of 238 92 U, what was the radioactive decay particle that was emitted?

C. 4 2 He

=====================================

7. What was the reactant that underwent beta decay if 14 7 N was the product?

A. 14 6 C

=====================================

8. Nuclear fusion reactions are referred to as “clean” nuclear energy because of the fact that they do not produce large amounts of radioactive waste. In a nuclear fusion reaction, the energy comes from the mass difference of the ___ nuclei being combined to form ___ nuclei. The mass difference between the reactants and products is the ___ that is converted into ___

A. lighter, heavier, mass, energy

======================================

9. Atoms do not break apart into protons and neutrons because the ___ forces between nucleons are stronger than the ___ forces.

B. nuclear, electromagnetic

=====================================

10. What are some uses of nuclear reactions?

D. All of the above

==================================

11. What is the spontaneous disintegration in which particles and/or electromagnetic radiation are emitted?

A. radioactivity

======================================

12. Who discovered radioactivity?



C. Henri Becquerel

======================================

13. What is the length of time it takes for half of the atoms in a given radioactive sample to decay?

A. half-life

====================================

14. Which of the following is a type of nuclear radiation?

D. all of the above

====================================

15. What is the change in the identity of a nucleus because of a difference in proton number?

B. Transmutation

======================================

16. What is the binding energy per nucleon of Au-197 (atomic mass = 3.2696 x 10-25kg @ 6.0221e26amu/kg = 196.898582 amu)?

the equation for binding energy that:

Eb = (Z × mH + N × mn - misotope) × 931.5 MeV/amu

Eb = binding energy, in MeV

Z = number of protons

mH = mass of a hydrogen atom (1.007825 atomic mass units, or amu)

N = number of neutrons

mn = mass of a neutron (1.008664904 amu)

misotope = actual mass of the isotope

931.5 Mev/amu = the conversion factor to convert mass into energy, in units of MeV

Eb = (Z × mH + N × mn - misotope) × 931.5

Eb = [(79 × 1.007825 amu) +

(118 × 1.008664904 amu)  - (196.898582 amu)] × 931.5

Eb = [(79.684530 amu) +

(119.0224587 amu)  - (196.898582 amu)] × 931.5

Eb = 1.8084× 931.5

Eb = 1684.5 Mev per 196 nucleons

Eb = 8.595 Mev/nucleon

=========================

17. Write the properly balanced beta decay equation indicating the resulting products:

I think that you are telling me that Tc is your starting material undergoing the decay:

43/99 Tc --> -1/0 e + 44/99 Ru

but if you are telling me that Tc is one of your resulting products:

42/99 Mo --> -1/0 e + 43/99 Tc

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18. Write the properly balanced alpha decay equation indicating the resulting products:  

I think that you are telling me that Po is your starting material under going the decay:

84/210 Po --> 2/4 He + 82/206 Pb

but if you are telling me that Po is a resulting product product:

80/214 Hg --> 2/4 He + 84/210 Po

Answer 2

If this is from tha online chemistry

2. A,B

17. Tc4399 ® Ru4499 + 0-1e + n

18.  Po 84210 ® Pb82206 + 42 He

everything else is right