I'm doing Science right now. I have the answers down for most of them but I'm not sure if I am right..... Can u pls help me and tell me if my answers r right? I suck at science :S
1.A
2.C
3.B
4.D
5.D
6.A
7.?
8.A
9.E
10.C
11.A
12.D
13.C
14.B
15.?
16.?
17.?
18.E
19.D
20.E
1. The positively charged particle in an atom:
A. proton
B. neutron
C. electron
D. pion
E. gluon
2. The negatively charged particle in an atom:
A. proton
B. neutron
C. electron
D. pion
E. gluon
3. The largest particle in an atom:
A. proton
B. neutron
C. electron
D. pion
E. gluon
4. Tiny particles that can be exchanged by protons and neutrons:
A. alpha particles
B. quarks
C. electrons
D. pions
E. gluons
5. Tiny particles that can be emitted by neutrons to form protons:
A. alpha particles
B. quarks
C. gluons
D. beta particles
E. photons
6. An isotope remains unchanged by the emission of a gamma ray, which is a(an) __________.
A. alpha particle
B. quark
C. gluon
D. beta particle
E. photon
7. An unstable isotope is transformed into a different element by the emission of a(n)__________.
A. alpha particle
B. quark
C. gluon
D. gamma ray
E. photon
8. A hydrogen atom with no electron is the same as a __________.
A. proton
B. neutron
C. photon
D. pion
E. beta particle
9. A helium-4 atom with no electrons is the same as a(an) __________.
A. proton
B. neutron
C. photon
D. pion
E. alpha particle
10. A gamma ray is pure __________.
A. magnetism
B. mass
C. energy
D. all of the above
E. none of the above
11. Niels Bohr is known for his model of the:
A. atom
B. atomic nucleus
C. simple electron orbit
D. all of the above
E. none of the above
12. The very complex __________ corrects the oversimplifications of the Bohr model.
A. Rutherford model
B. relativity model
C. Newtonian model
D. quantum-mechanical model
E. none of the above
13. The errors of the Bohr model center around the treatment of the:
A. protons
B. neutrons
C. electrons
D. quarks
E. none of the above
14. The number of protons in the nucleus of an atom:
A. atomic mass
B. atomic number
C. isotope number
D. half-life number
E. none of the above
15. The total number of protons and neutrons in the nucleus of an atom:
A. mass number
B. atomic number
C. isotope number
D. half-life number
E. none of the above
16. Radioactive decay occurs as __________.
A. alpha decay
B. beta decay
C. gamma decay
D. all of the above
E. none of the above
17. Radioactive decay occurs in an atom that has a(n) __________.
A. unstable nucleus
B. unstable electron shell
C. excess of electrons
D. deficit of electrons
E. none of the above
18. The rate of radioactive decay is measured in terms of __________.
A. isotopes
B. grams
C. rads
D. roentgens
E. half-life
19. Assuming that the half-life of a radioactive substance is 10 years, how much of the original substance will remain after 20 years?
A.100%
B. 75%
C. 50%
D. 25%
E. zero
20. Radioactive dating using ^14C (carbon isotope 14) has been shown to be inaccurate due to differences in ^14C found in __________.
A. dinosaur bones
B. rock strata
C. igneous rock
D. sedimentary rock
E. none of the above
1 correct
2 correct
3 correct
4 correct
5 correct
There's the first 5.... I'll check the others when i get some sleep....
@scott
I don't understand your answers. None of the ones you gave me match the multiple choice answers. Are you giving me wrong answers on purpose or.....?
@Osprey
Oh, okay..... Yeah, lol. I should get some too.
Sure, I can help you with that! Let's go through the questions one by one.
1. The positively charged particle in an atom:
You selected A. proton. That is correct!
2. The negatively charged particle in an atom:
You selected C. electron. That is correct!
3. The largest particle in an atom:
You selected B. neutron. The correct answer is A. proton. So, your answer is incorrect.
4. Tiny particles that can be exchanged by protons and neutrons:
You selected D. pions. The correct answer is B. quarks. So, your answer is incorrect.
5. Tiny particles that can be emitted by neutrons to form protons:
You selected D. beta particles. The correct answer is A. alpha particles. So, your answer is incorrect.
6. An isotope remains unchanged by the emission of a gamma ray, which is a(an) __________.
You selected A. alpha particle. The correct answer is E. photon. So, your answer is incorrect.
7. An unstable isotope is transformed into a different element by the emission of a(n)__________.
You left this question blank. The correct answer is A. alpha particle.
8. A hydrogen atom with no electron is the same as a __________.
You selected A. proton. That is correct!
9. A helium-4 atom with no electrons is the same as a(an) __________.
You selected E. alpha particle. That is correct!
10. A gamma ray is pure __________.
You selected C. energy. That is correct!
11. Niels Bohr is known for his model of the:
You selected A. atom. That is correct!
12. The very complex __________ corrects the oversimplifications of the Bohr model.
You selected D. quantum-mechanical model. That is correct!
13. The errors of the Bohr model center around the treatment of the:
You selected C. electrons. That is correct!
14. The number of protons in the nucleus of an atom:
You selected B. atomic number. That is correct!
15. The total number of protons and neutrons in the nucleus of an atom:
You left this question blank. The correct answer is A. mass number.
16. Radioactive decay occurs as __________.
You left this question blank. The correct answer is D. all of the above.
17. Radioactive decay occurs in an atom that has a(n) __________.
You left this question blank. The correct answer is A. unstable nucleus.
18. The rate of radioactive decay is measured in terms of __________.
You selected E. half-life. That is correct!
19. Assuming that the half-life of a radioactive substance is 10 years, how much of the original substance will remain after 20 years?
You selected D. 25%. That is correct!
20. Radioactive dating using ^14C (carbon isotope 14) has been shown to be inaccurate due to differences in ^14C found in __________.
You left this question blank. The correct answer is B. rock strata.
Overall, your answers are mostly correct. Good job! If you have any more questions, feel free to ask.
6) gamma is electromagnetic radiation
7) helium nucleus
11) electrons
15) total mass
16) more than one
17) instability