Things that need to be in your homework notebook when it’s picked up on test day…
Bohr worksheet Hotel chemistry worksheet Study Guide
For the upcoming test, you need to understand the following material…
…correctly order the major discoveries that lead up to the atomic models that we’ve studied so far…
1. Give a brief description of what these people did – of importance to atomic theory…
Rutherford Chadwick Thomson Dalton
…determine the number of protons, neutrons, and electrons in an atom…
2. Complete this chart of protons, neutrons, and electrons
Symbol / Charge / Atomic # / Mass # / Protons / Neutrons / Electrons101 / 258 / 101
+1 / 21 / 19
40 / 55 / 40
-2 / 8 / 10
Au / +2 / 126
…draw models of the atom…
3. Draw these atoms as Dalton and Rutherford would have seen them…
helium-4
…connect evidence for discoveries to the discoveries themselves…
4. In a paragraph, answer the following question…How did JJ Thomson know that the beam that he saw within the cathode ray tube was made of negative particles.
Make sure that you have a topic sentence, three or more supporting sentences, and a closing sentence. Include any observations he took and inferences he made.
5. In a paragraph, answer the following question…Describe Ernest Rutherford’s gold-foil experiment and explain how this lead him to believe in the existence of and positive charge of the atomic nucleus.
Make sure that you have a topic sentence, three or more supporting sentences, and a closing sentence. Include any observations he took and inferences he made.
…Explain what was wrong with the previous models of the atom…
6. Explain – in a complete sentence for each one – what forced chemists to revise the models of Dalton, Rutherford, Thomson, and Bohr.
…Explain the parts of the wave…
7. Label wavelength, node, peak, trough, baseline, and amplitude of a wave…after you draw one, of course…
8. How are wavelength and frequency related? Wavelength and energy? Energy and frequency?
…look at a model of an atom and identify what is wrong with it…
9. Jimmy was told to draw Rutherford’s updated model of a nitrogen-14 atom. In a few sentences, tell what Jimmy did wrong and draw what his atom should, instead, have looked like.
…Differentiate between quantized and continuous…
10. Label each of these as quantized or continuous…
a) position of the sun in the sky b) position of your feet on a ladder
c) height of a child as time passes d) position of electrons in the Bohr model
e) position of electrons in the Rutherford model f) position of electrons in the quantum model
11. Explain – using a complete sentence or two, of course – one of your choices for quantized and one for continuous.
…Relate wavelength, frequency, and energy for waves in the electromagnetic spectrum…
12. Which has the longer l, green or red light?
13. Which has the higher n, infrared or ultraviolet light?
14. What is the wavelength of light that corresponds to a frequency of 5.26 x 1014 hz? How much energy per photon does such a wave deliver? What color is the light?
…Arrange electrons in the quantum mechanical model…
15. Draw the electron configuration for…chromium’s +2 ion…fluorine’s –1 ion…and phosphorus’s neutral atom…
16. Write the electron configuration for…calcium’s +1 ion…fluorine’s –1 ion…mercury’s neutral atom…
17. Which of these could have the electron configuration of…
1s22s22p63s23p64s23d104p6
neutral krypton…bromine’s –1 ion…selenium’s –1 ion…rubidium’s +1 ion…