WorksheetsChemistry Ch 3 Atoms
Total questions: 31
Worksheet time: 19mins
Name
Class
Date
1.
Who was the schoolmaster who studied chemistry and proposed an atomic theory?
a)
John Dalton
b)
Jons Berzelius
c)
Robert Brown
d)
Dmitri Mendeleev
2.
The principles of atomic theory recognized today were conceived by
a)
Avogadro
b)
Bohr
c)
Dalton
d)
Rutherford
3.
According to Dalton's atomic theory, atoms
a)
are destroyed in chemical reactions
b)
can be divided
c)
of each element are identical in size, mass, and other properties
d)
of different elements cannot combine
4.
Dalton's atomic theory helped to explain the law of conservation of mass because it stated that atoms
a)
could not combine
b)
could not be created or destroyed
c)
all have the same mass
d)
were invisible
5.
In early experiments on electricity and matter, an electrical current was passed through a glass tube containing
a)
water
b)
gas under high pressure
c)
liquid oxygen
d)
gas under low pressure
6.
In a glass tube, electrical current pass from the negative electrode, called the ____, to the other electrode
a)
cathode
b)
anode
c)
electron
d)
millikan
7.
Experiments with cathode rays led to the discovery of the
a)
proton
b)
nucleus
c)
neutron
d)
electron
8.
Which scientist measured the charge on the electron?
a)
Dalton
b)
Rutherford
c)
Millikan
d)
Marsden
9.
A positively charge particle is a(n)
a)
proton
b)
neutron
c)
electron
d)
positron
10.
The mass of a neutron is
a)
about the same as that of a proton
b)
about the same as that of an electron
c)
double that of a proton
d)
double that of an electron
11.
The smallest unit of an element that can exist either alone or in combination with other such particles of the same or different elements is the
a)
electron
b)
proton
c)
neutron
d)
atom
12.
Atoms of the same element that have different masses are called
a)
moles
b)
isotopes
c)
nuclides
d)
neutrons
13.
Carbon-12 and Carbon-11 are
a)
isotopes
b)
different elements
c)
compounds
d)
neutrons
14.
A boron isotope consists of 5 protons, 5 electrons and 7 neutrons. Its mass number is
a)
10
b)
11
c)
12
d)
2
15.
What is the atomic number for oxygen?
a)
8
b)
16
c)
6
d)
10
16.
A neutral atom of fluorine contains
a)
9 electrons
b)
18.9984 electrons
c)
10 electrons
d)
19.00 electrons
17.
An atom of calcium has 20 protons and 20 neutrons. What is its mass number?
a)
20
b)
40
c)
60
d)
80
18.
A neutral nitrogen atom (atomic number 7) has
a)
7 electrons, 7 neutrons
b)
7 neutrons
c)
7 protons, 7 electrons
d)
7 protons, 6 neutrons
19.
The number of atoms in a mole of any pure substance is called
a)
its atomic number
b)
Avogadro's number
c)
its mass number
d)
its gram-atomic number
20.
Who discovered the nucleus by bombarding gold foil with positively charged particles and noting that some particles were widely deflected?
a)
Dalton
b)
Millikan
c)
Mendeleev
d)
Rutherford
21.
How many atoms are present in 6.00 mol of chlorine atoms?
a)
4.82 x 10>24
b)
3.61 x 10>24
c)
9.97 x 10>-24
d)
1.28 x10>26
22.
How many moles of Al are equivalent to 1.6 x 10>22 atoms?
a)
0.027
b)
9.6 x 10>45
c)
2.6 x 10>47
d)
0.72
23.
How many moles of water (H2O) are in 14 grams?
a)
3.9 x 10>22
b)
4.7 x 10>23
c)
252
d)
.78
24.
What is the number of protons that the element in this image contain?
a)
14
b)
7
c)
15
d)
18
25.
Particles in an atom that are neutral and have no charge are
a)
negatrons
b)
electrons
c)
neutrons
d)
protons
26.
The number of atoms in 1 mol of carbon is
a)
6.022 x 1022
b)
6.022 x 1023
c)
5.022 x 1022
d)
5.022 x 1023
27.
The isotope uranium-235 has 92 protons and 142 neutrons. Its mass number is
a)
92
b)
235
c)
143
d)
impossible to tell
28.
What scientist is best known for his "Plum Pudding" model of the atom?
a)
J.J. Tomson
b)
Ernest Rutherford
c)
John Dalton
d)
Democritus
29.
Place the following scientists in order, from earliest to latest:
A) Ernest Rutherford
B) J.J. Thomson
C) John Dalton
A) Ernest Rutherford
B) J.J. Thomson
C) John Dalton
a)
B,C,A
b)
C,A,B
c)
A,C,B
d)
C,B,A
30.
J.J. Thomson provided evidence that an atom...
a)
is the smallest particle of matter
b)
contains negatively charged particles
c)
has an overall negative charge
d)
has an overall positive charge
31.
What are the 3 particles that make-up the atom?
a)
protons, neutrons, and isotopes
b)
neutrons, isotopes, and electrons
c)
positives, negatives, and electrons
d)
protons, neutrons, and electrons
100 %
