Glosario de Términos

• The chapter quiz and answer key are available upon request. Please send an email to [email protected] to request the material.

Chapter 4 Quiz

Name___________________ Class______ Date ______

1. How many atoms are present in one molecule ofCr(NH3)5SO4Br?

A. 4 B. 8 C. 16 D. 23 E. 27

2. A certain element commonly has 8 protons, 8 neutrons, and 8 electrons. Choose the following particle that would denote an isotope of this element.

A. 4 protons, 4 neutrons, 4 electrons B. 8 protons, 8 neutrons, 4 electrons C. 8 protons, 10 neutrons, 8 electrons D. 10 protons, 8 neutrons, 8 electrons E. 10 protons, 10 neutrons, 8 electrons

3. A neutral atom has a mass number of 45 and an atomic number of 21. Which of the following is true? A. The number of electrons is 24.

B. The number of neutrons is 21. C. The number of protons is 24.

D. The number of electrons is equal to the number of neutrons. E. The numbers of protons and neutrons are not the same.

4. A particular neutral atom contains 11 electrons and 12 neutrons. What is its mass number? A. 11

B. 12 C. 23 D. 132

E. None of these.

5. The important discovery from Rutherford’s gold foil experiment was that A. gold atoms allow alpha particles to pass through.

B. the volume occupied by an atom is largely empty space. C. alpha particles are dense.

D. electrons are not attracted to positively charged alpha particles.

E. alpha particles pass through gold un-deflected because of the small size of the atom.

4.8. Chapter 4 Assessment www.ck12.org

Questions 6 and 7 relate to the following table. {

6. Which pairs are different isotopes of the same element? A.qandrof one element andvandwof another element B.qandrof one element andsandtof another element C.qandsof one element andtanduof another element D.q,r, andsare all isotopes of one element

E. None of these are isotopes of one another. 7. Which samples are ions?

A.q,r, andt

B.randw

C.q,t,v, andw

D. None of these are ions. E. All of these are ions.

8. The ionCH+has been detected in the tails of comets. What is the total number of electrons inCH+? A. 5

B. 6 C. 7 D. 8

E. None of these.

9. How many hydrogen atoms are present in one molecule of glycerin,C3H5OH3?

A. 14 B. 8 C. 6 D. 5

E. None of these.

10. The atomic number of an atom is 53 and its mass number is 127. How many neutrons are present in the nucleus of this atom? A. 53 B. 127 C. 74 D. 180 E. None of these.

11. The statement in Dalton’s atomic theory that all atoms of the same element are exactly alike has been replaced in the modern atomic theory because of the discovery of

A. the bending of cathode rays by magnets.

B. the existence of electrons and protons in an atom. C. isotopes.

E. None of these.

12. If two atoms are isotopes, it means that they have the same number of: A. neutrons but a different number of electrons.

B. protons but a different number of electrons. C. protons but a different number of neutrons. D. neutrons but a different number of protons. D. electrons but a different number of protons.

13. An atom of the isotope sulfur-31 contains how many protons, electrons, and neutrons? A. 15p,15e,16n

B. 16p,16e,15n

C. 16p,16e,31n

D. 32p,32e,31n

E. None of these.

14. In some cases, the symbol of an element does not appear to bear any relationship to the name we use for the element. Generally, the symbol for such an element is based on the element’s name in another language. Give the symbols and names for at least three examples of such elements.

15. Write the simplest possible formula for a compound, listing the elements in the order given, containing one aluminum atom for every three chlorine atoms.

16. What is the mass of an electron compared to the mass of a proton? A. ₁₈1

B. ₁₈₀1 C. ₁₈₀₀1 D. _18,1₀₀₀

17. Atoms are neutral. This means: A. the nucleus is made up of neutrons.

B. there are equal numbers of protons and neutrons in an atom. C. the electrons normally have zero charge.

D. the number of electrons balances the number of protons.

18. An isotope of cadmium has an atomic number of 48 and a mass number of 112. This means that this atomic of cadmium has:

A. 48 protons, 64 neutrons, and 48 electrons. B. 64 protons, 48 neutrons, and 64 electrons. C. 48 protons, 112 neutrons, and 48 electrons. D. 112 protons, 48 neutrons, and 112 electrons.

19. A beryllium atom has 4 protons, 5 neutrons, and 4 electrons. What is the mass number of this atom? A. 4 B. 5 C. 8 D. 9 E. 13

20. Pick the true statement.

4.8. Chapter 4 Assessment www.ck12.org

A. Number of neutrons = mass number + atomic number. B. Mass number = number of neutrons in the nucleus. C. Number of neutrons = mass number - atomic number. D. Atomic number = mass number - number of protons.

Answers to Chapter 4 Quiz

1. E 2. C 3. E 4. C 5. B 6. C 7. B 8. E 9. B 10. C 11. C 12. C 13. B

14. Na=sodium (from natrium)

K=potassium (from kaolinium)

Fe=iron (from ferrum)

Sn=tin (from stannum)

Pb=lead (from plumbum)

W=tungsten (from wolfram)

Cu=copper (from cuprum)

Ag=silver (from argentum)

Au=gold (from aurum). 15. AlCl3 16. C 17. D 18. A 19. D 20. C

CHAPTER

5

The Bohr Model of the Atom

C-SE-TE

Chapter Outline

5.1 THENATURE OFLIGHT

5.2 ATOMS ANDELECTROMAGNETICSPECTRA

5.3 THEBOHRMODEL OF THEATOM

5.4 MULTIMEDIARESOURCES FOR CHAPTER5 5.5 LABORATORY ACTIVITIES FORCHAPTER5

5.6 WORKSHEETS FORCHAPTER5 5.7 EXTRAREADINGS FORCHAPTER5 5.8 ASSESSMENT FORCHAPTER5

Lessons and Number of Activities for Lessons

T

5.1:

Lesson No. of Labs No. of Demos No. of Worksheets No. of Extra Read-

ings 1. The Nature of

Light

0 0 0 1

2. Atoms and Elec- tromagnetic Spectra

1 1 0 0

3. The Bohr Model of the Atom

0 0 1 0

5.1. The Nature of Light www.ck12.org

5.1

_{The Nature of Light}

Student Behavioral Objectives

The student will:

• perform calculations involving the relationship between the wavelength and frequency of electromagnetic radiation,v=λf.

• perform calculations involving the relationship between the energy and the frequency of electromagnetic radiation,E=h f.

• state the velocity of electromagnetic radiation in a vacuum.

• name at least three different areas of the electromagnetic spectrum.

• when given two comparative colors or areas in the electromagnetic spectrum, identify which area has the higher wavelength, the higher frequency, and the higher energy.

Timing, Standards, Activities

T

5.2:

Lesson Number of 60 min periods CA Standards

The Nature of Light 1.5 1h, 1j

Activities for Lesson 1

Laboratory Activities 1. None Demonstrations 1. None Worksheets 1. None Extra Readings

1. What is the Electromagnetic Spectrum?

Answers for The Nature of Light (L1) Review Questions

• Sample answers to these questions are available upon request. Please send an email to [email protected] to request sample answers.

1. Any three of the following: gamma rays, x-rays, ultra-violet light, visible light, infra-red light, microwaves, radio waves.

2. red

3. 3.0x108m/s

4. f = v_λ(Divide the wavelength into the velocity.) 5. f = v

λ =

9.0m/s

3.0m = 3.0Hz

6.v = λf = (1.34m)(256s−1) = 343m/s 7. E =hf wherehis Planck’s constant.

8.E = h f = (6.63x10−34J·s)(5.66x108s−1) = 3.75x10−25Joules