science

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 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. 👍
  2. 👎
  3. 👁
  1. 6) gamma is electromagnetic radiation

    7) helium nucleus

    11) electrons

    15) total mass

    16) more than one

    17) instability

    1. 👍
    2. 👎
  2. 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....

    1. 👍
    2. 👎
  3. @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.

    1. 👍
    2. 👎

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