Download Unit 3 GROUP QUIZ

Unit 3 GROUP QUIZ
Multiple Choice : Write the best answer to each question in the blank. (2 points each)
___1. Who was the first person to suggest the idea of atoms, in the fourth century B.C.?
a. Atomos
b. Dalton
c. Democritus
d. Galileo
e. Thomson
___2. Dalton’s atomic theory included which idea?
a. All atoms of all elements are the same size.
b. Atoms of different elements always combine in one-to-one ratios.
c. Atoms of the same element are always identical.
d. Individual atoms can be seen with a microscope.
e. When an atom of an element changes into another element, a chemical reaction takes
place.
___3. Which of the following was originally a tenet of Dalton’s atomic theory, but had to be
revised a century ago?
a. Atoms can be divided into subatomic particles.
b. Atoms of the same element are identical.
c. Compounds are molecules make by uniting atoms.
d. Atoms of different elements can combine with one another in simple whole number
ratios.
e. In a chemical reaction, atoms of one element are not changed into atoms of another
element.
___4. Why did J.J. Thomson reason that electrons must be a part of the atoms of all elements?
a. All atoms of the same element are identical.
b. An electron in 2000 times lighter than a hydrogen atom.
c. All cathode rays are attracted to a positively charged plate, regardless of gas used.
d. The nucleus of an atom should contain neutrons.
e. A neutral atom should have dozens of subatomic particles.
___5. Select the correct statement about subatomic particles.
a. Elements are negatively charged and are the heaviest particles.
b. Protons are positively charged and are the lightest particles.
c. Neutrons have no charge and are the lightest particles.
d. The mass of a neutron nearly equals that mass of a proton.
e. Electrons, protons and neutrons all have the same mass.
___6. As a result of the discovery of the nucleus by Rutherford, which model of the atom is
believed correct?
a. A model in which the protons, electrons and neutrons are evenly distributed
throughout the volume of the atom.
b. A model in which the nucleus is made of protons, electrons and neutrons.
c. A model in which the nucleus is made of neutrons only.
d. A model in which the nucleus is made of electrons and protons.
e. A model in which the region outside the nucleus is largely empty space in which
electrons are situated.
___7. The nucleus of an atom is ______.
a. is composed of protons and neutrons.
b. is composed of protons and electrons..
c. occupies a large part of the atom.
d. is the lightest part of the atom.
e. has no charge.
___8. The nucleus of an atom is ______.
a. positively charged and has a high density.
c. negatively charged and has a
high density.
b. positively charged and has a low density. d. negatively charged and has a low
density.
___9. If electromagnetic radiation A has a lower frequency than electromagnetic radiation B, the
wavelength of A is
a. longer
c. shorter
b. equal to B’s wavelength
d. exactly half of B’s wavelength
___10. Which of these statements is false?
a. Protons have a positive charge.
b. Electrons are negatively charged and have a mass of 1 u.
c. The nucleus of an atom is positively charged.
d. The neutron is found in the nucleus of an atom.
___11. All atoms are ______.
a. positively charged, with the number of protons exceeding the number of electrons.
b. Negatively charged, with the number of electrons exceeding the number of protons.
c. Neutral, with the number of protons equaling the number of electrons.
d. Neutral, with the number of protons equaling the number of electrons equaling the
number of neutrons.
e. Neutral, with the number of protons equaling the number of neutrons equaling half
the number of electrons.
___12. In which of the following sets are the symbol of the element, the number of protons, and
the number of electrons given correctly?
a. In, 49 protons, 49 electrons
d. F, 19 protons, 19 electrons
b. Zn, 30 protons, 60 electrons
e. He, 4 protons, 4 electrons
c. Cs, 55 protons, 132.9 electrons
___13. The atomic number of an element is the total number of which particles in the nucleus?
a. Neutrons
d. Protons and electrons
b. Protons
e. Protons, electrons and neutrons
c. Electrons
___14. All atoms to the same element have the same _____.
a. number of neutrons
b. number of protons
c. mass numbers
d. mass
___15. The number of neutrons in the nucleus of an atom can be calculated by _____.
a. adding together the number of electrons and protons
b. subtracting the number of electrons from the number of protons
c. subtracting the number of protons from the mass number
d. adding the mass number to the number of electrons
___16. In which of the following is the number of neutrons correctly represented?
19
a.
F has 0 neutrons
9
75
b.
As has 108 neutrons
33
24
c.
Mg has 24 neutrons
12
197
d.
Au has 79 neutrons
79
238
e.
U has 146 neutrons
92
___17. Red light has a longer wavelength than blue light. Compared to the blue line on the
hydrogen spectrum, the red line would represent
a.higher energy and lower frequency.
c. higher energy and higher frequency.
b.lower energy and higher frequency.
d. lower energy and lower frequency.
___ 18. Using the periodic table, determine the number of neutrons in 206Pb.
a. 82
b. 124
c. 206
d. 288
___19. An atom of an element with atomic number 50 and mass number 120 contains
a. 50 protons, 50 electrons, and 70 neutrons
b. 70 electrons, 509 protons, and 50 neutrons
c. 120 neutrons, 50 protons, and 70 electrons
d. 70 neutrons, 70 protons, and 50 electrons
___20. Which of these statements is NOT true?
a. Atoms of the same element can have different masses.
b. Atoms of isotopes of an element have different number of protons.
c. The nucleus of an atom has a positive charge.
d. Atoms are mostly empty space.
___21. An atom that has gained or lost electrons and carries a net electrical charge is called an
a. isotope
b. element
c. ion
d. electron
___22. In wave motion, the product of frequency and wavelength is equal to the
a.number of waves passing a given point in a second.
b.speed of the wave.
c.distance between successive wave crests.
d.time for one full wave to pass a given point.
Calculations: SHOW ALL WORK FOR CREDIT
23. Element Z has three isotopes with the following atomic mass and abundances:
Z1 – 10.97 amu, 88.3%; Z2 – 9.98 amu, 7.6%; Z3 – 11.96 amu, 4.1%.
Determine the average atomic mass of element Z.(10 points)
24. Calculate the frequency in Hertz for a photon that has a wavelength 6.50 x 10-7 m. Show all
work. (4 points)
25. Calculate the wavelength in meters for a photon that a frequency of 9.55 x 1014 Hz. (4 points)
26. Fill in the chart: (2 point each)
Element
Z
gold
A
p
n
e
Isotopic
symbol
198
29
64
11
6
80 -1
Br
35