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Northern Star Online Chemistry Atoms Fundamental Forces & Protons Videos Discussion

Northern Star Online Chemistry Atoms Fundamental Forces & Protons Videos Discussion

Question Description

Please copy and paste questions with your answers. Click video links when applicable.


Part 1: Video Clips

A:

1. Describe the nucleus of the atom.

2. Why is the nucleus positive in charge?

3. Explain why the nucleus is very dense.

4. Outline the forces that act on particles in the nucleus.

5. If you made a three-dimensional model of an atom and its nucleus, how would you represent the atom? How would you represent the nucleus? Explain your choices.

6. Summarize the video and describe what did you learn about the cathode ray tube.

7. Video Clip 1 Question: What makes atoms different from each other?

8. Video Clip 2 Question: What are the four fundamental forces the video describes?

B: Watch the video on how protons, electrons, and neutrons were discovered.

Describe the experiment and the important discovery made by the following scientists:

For each person, describe their experiment, their conclusion and identify their discovery.

1. Dalton

2. Thompson

3. Rutherford

4. Chadwick

Part 2:

1) Decide whether each of the following statements is true or false. Fix any false statements.

  1. The nucleus of an atom contains all of the protons in the atom.
  2. The nucleus of an atom contains all of the neutrons in the atom.
  3. The nucleus of an atom contains all of the electrons in the atom.
  4. Neutral atoms of a given element must contain the same number of neutrons and protons.
  5. Neutral atoms of a given element must contain the same number of electrons protons.

2) What are subatomic particles?

3) Explain the characteristics of an electron, neutron, and proton.

4) Arrange the electron, proton, and neutron in order of decreasing mass.

5) Indicate which of the following statements is true or false. Fix the false statements

  1. An element’s atomic number is equal to the number of protons in the nuclei of any of its atoms
  2. The symbol for an element’s atomic number is A.
  3. A neutral atom with Z = 4 must have 4 electrons.
  4. A neutral atom with A = 4 must have 4 electrons.
  5. An atom with 7 protons and 7 neutrons will have A = 14.
  6. An atom with 7 protons and 7 neutrons will have Z = 14.
  7. A neutral atom with 7 electrons and 7 neutrons will have A = 14.

6) Use the periodic table to find the symbol for the element with

  1. 44 electrons in a neutral atom.
  2. 30 protons.
  3. Z = 36.
  4. an atomic mass of 126.

7) When will the mass number (A) of an atom be:

  1. bigger than the atomic number (Z) of the atom?
  2. smaller than the atomic number (Z) of the atom?
  3. equal to the atomic number (Z) of the atom?

Part 3:

A:

1) Answer the following questions:

  1. What’s the mass number of an atom that contains 13 protons and 13 neutrons?
  2. What’s the mass number of an atom that contains 24 protons and 30 neutrons?
  3. What’s the mass number of the isotope of manganese (Mn) containing 28 neutrons?
  4. What’s the mass number of the isotope of calcium (Ca) containing 20 neutrons?
  5. What’s the atomic number of an atom that has 30 neutrons, and a mass number of A = 70?
  6. What’s the atomic number of an atom with 14 neutrons, if the mass number of the atom is A = 28?

2) Answer the following questions:

  1. What’s the mass number of a neutral atom that contains 7 protons and 7 neutrons?
  2. What’s the mass number of a neutral atom that contains 7 electrons and 7 neutrons?
  3. What’s the mass number of a neutral atom that contains 5 protons, 5 electrons, and 6 neutrons?
  4. What’s the mass number of a neutral atom that contains 3 electrons and 4 neutrons?
  5. What element has 32 neutrons in an atom with mass number A = 58?
  6. What element has 10 neutrons in an atom with mass number A= 19?

3) Copper has two naturally occurring isotopes.69.15 % of copper atoms are Cu-63 and have a mass of 62.93 amu. The other 30.85 % of copper atoms are Cu-65 and have a mass of 64.93 amu What is the atomic mass of copper? Show your work.

B:

Show your work.

1) What is the mass number of an atom that contains Z = 17 and 18 neutrons?

2) What is the mass number of an atom of hydrogen that contains no neutrons?

3) What are the atomic number (Z) and the mass number (A) of an isotope of Sulfur-containing 19 neutrons? A sulfur atom contains 16 protons in its nucleus.

4) Boron has two naturally occurring isotopes. In a sample of boron, 30% of the atoms are B-10, which is an isotope of boron with 5 neutrons and a mass of 10 amu. The other 70% of the atoms are B-11, which is an isotope of boron with 6 neutrons and a mass of 11 amu. What is the atomic mass of boron?

5) A student looked up the naturally occurring isotopes of bromine and found the following information:

50.54% of the naturally occurring isotopes of bromine have an atomic mass of 78.92 u while 49.46% of the naturally occurring isotopes of bromine have an atomic mass of 80.92 u.

Calculate the average atomic mass of bromine, showing all work:

6) Neon has three naturally occurring isotopes. In a sample of neon, 80.75% of the atoms are Ne-20, which is an isotope of neon with 10 neutrons and a mass of 19.99 amu. Another 0.25% of the atoms are Ne-21, which is an isotope of neon with 11 neutrons and a mass of 20.99 amu. The final 19% of the atoms are Ne-22, which is an isotope of neon with 12 neutrons and a mass of 21.99 amu. What is the atomic mass of neon? Show your work.

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