Chemistry - The Atom

Number of questions: 44

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The alpha particle scattering experiment was carried out by:

Goldstein
J. Chadwick
J.J. Thomson
Rutherford

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Which sequence lists a nonmetal, metalloid and a transition metal, respectively?

Al, As, Ag
Co, Pb, P
N, Si, Fe
O, Ge, Cs

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Which statement below correctly describes the responses of alpha, beta, and gamma radiation in an eletric field?

Beta and alpha rays are deflected in opposite directions while gamma rays show no response
Both alpha and beta rays are deflected in opposite directions while gamma rays show no response
Both alpha and gamma rays are deflected in the same direction while beta rays show no response
both beta and gamma rays are deflected in the same direction while alpha rays show no response

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Dalton said that elements are different distinguished from each other by:

The density of their solid forms
the charge on their ions
the shapes of their atoms
the weights of their atoms

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The name of the ionic compound KBrO4 is

Potassium Perbromite
Potassium bromate
Potassium hypobromate
Potassium perbromate

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Which of the following is a metal?

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Which radiation type has no detectable charge?

Alpha
Beta
Both alpha and gamma
Gamma

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_____rays are a stream of fast-moving electrons.

Alpha
Beta
Gamma
None of these

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Which ion has the wrong charge?

Ba2+
Cs1+
Te2-
Xe1-

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10)

Which one of the following incorrectly labeled?

Ca; alkaline earth metal
I; halogen
Mg; alkali metal
Rn; noble gas

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11)

Water, no matter where it is found, consists of hydrogen and oxygen combined in a 1:18 ratio by mass. This is a statement of

the law of conservation of energy
the law of conservation of mass
the law of constant composition
the law of multiple proportions

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12)

Which one of the following is improperly labeled?

Ba; alkaline earth metal
I; chalcogen
Kr; noble gas
Na; akali metal

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13)

According to Rutherford, the atom consists of the following two parts:

Electrons and Protons
Neutrons and Electrons
Protons and Neutrons
nucleus and the extra-nuclear part

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14)

An element in the lower left corner of the periodic table

is definitely a metal
is definitely a nonmetal
is either a metal or metalloid
is either a metalloid or a nonmetal

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15)

A certain number of electrons has a total charge of~ 1.1x10 to the negative 18C. How many electrons are there?

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16)

Which of the following should be the most similar in chemical property to strontium?

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17)

The ray of light within a neon sign bends when a magnet is held up to it because

impurities within the neon plasma are attracted to the magnet
magnetic fields are able to pass through glass
neon, like iron, is attracted to magnets
the light arises from the flow of electron within the tube

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18)

How many protons and neutrons are ther in 98/43Tc?

43 protons and 55 neutrons
49 protons and 98 neutrons
55 protons and 43 neutrons
98 protons and 43 neutrons

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19)

The element zinc consists of five isotopes with masses 63.929, 65.926, 66.927, 67.925 amu. The relative abundances of these five isotopes are 48.89, 27.81, 4.110, 18.57, and 0.62 percent, respctively. From these data calculate the average atomic mass of zinc.

65.387 amu
65.39 amu
66.927 amu
66.93 amu

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20)

Groups in the periodic table are also known as:

Chemical Families
IUPACs
Periods
assemblages

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21)

Which of the following compounds is not a possible ionic compound?

Cs2O
GaF3
NaF2
SrO

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22)

If 60g of carbon combine with 10g of hydrogen to form a compound, this means that any sample of this compound will contain ____ part(s) and ____ part(s) hydrogen by mass.

0.17
6, 1
5, 1
5, 10

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23)

An elemental ion has 22 protons, 20 electrons, and 26 neutrons. Which isotope is it?

(47)26Fe
(48)26Ti
48(22)Ti
48(22)Ti to the negative 2

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24)

Which pair of symbols represents isotopes?

160, 16N
160, 170
H, HE
He, He+

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25)

The STM, scanning tunneling microscope, shows:

the outer boundary surface of the electrons in an atom
number of excited electrons in an atom
the charge of the nucleus
the mass of the nucleus

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26)

Hydrogen combines with nitrogen in a 3:14 weight ratio to form ammonia. If every molecule of ammonia contains three atoms of hydrogen and one atom of nitrogen, an atom of nitrogen must weigh:

14 times the mass of a hydrogen atom
14/3 times the mass of a hydrogen atom
3 times the mass of a hydrogen atom
3/14 times the mass of a hydrogen atom

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27)

Hydrogen combines with florine ina 1:19 weight ration to form hydrogen fluoride. If every molecule of hydrogen flouride contains one atom of hydrogen and one atom of fluorine, an atom of fluorine must weigh:

38 times the mass o a hydrogen atom
1/38 times the mass of a hydrogen atom
19 times the mass of a hydrogen atom
1/19 times the mass of a hydrogen atom

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28)

What was the significance of the early experiment that demonstrated that a brightly glowing ray passed through a tube that contained nothing-a vacuum?

This experiment shoed that glass acts as a good conductor of electricity
This experiment showed that the ray itself was composed of particles
This experiment showed that the gases in the glass tube were required for the glowing ray
This experiment shoed that a vacuum actually does contain gaseous particles

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29)

How many carbon atoms are in CH3-O-Ch2-C2H5?

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30)

Elements belonging to which group of the periodic table form ions with a 2+ charge?

alkaline earth metals
halogens
chalcogens
alkali metals

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31)

What experiment established that the vast majority of the mass of an atom is contained in the nucleus?

Rutherford's experiment where gold foil is bombarded by electrons that are deflected by the gold nuclei
Rutherford's experiment where a gold foil is bombarded by positively charged helium
Rutherford's experiment where gold foil is bombarded by positively charged helium nucli that are deflected by the negatively charged nucleu of the gold
Rutherford's experiment where gold foil is bombarded by positively charged helium nuclei that are deflected by the gold electrons

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32)

A chemist on another planet performed the Millikan oil-drop experiment and measured the following charges in his planet's unit for charge, the bot: 2.62 times 10 to the negative 13 bots; 3.93 times 10 to the negative 13 bots. What is the electron's charge in bots?