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Ludwig Review #2
Test Description: Ludwig chem review 2
Instructions: Answer all questions to get your test result.
1) The nuclides C-12 and C-14 are classified as
A
b) isotopes of the same element
B
d) isotopes of- N-14 - 0-16
C
c) ions of- N-14 - 0-16
D
a) ions of the same element
2) What is the maximum number of electrons that can be in the 3rd shell?
A
2
B
32
C
18
D
8
3) Which has the most entropy
A
G
B
S
C
L
D
d) element
4) The elements on the Periodic Table are arranged in order of increasing
A
number of isotopes
B
number of valence electrons
C
atomic number
D
mass number
5) NaCl + MgBr2 = NaBr + MgCl2
A
double replacement
B
single replacement
C
synthesis
D
8
6) Which phrase describes the charge and mass of a neutron
A
no charge, no mass
B
no charge, mass of 1 amu
C
high pressure and high temperature
D
charge of + 1, mass of 1 amu
7) Which of the following is an empirical formula?
A
d) P4O10
B
a) H2O2
C
c) C2H4
D
b) N2O
8) What happens when electrons absobe energy?
A
a) Stay in the same energy level
B
c) Move randomly to a higher or a lower energy level
C
b) Move to a lower energy level
D
d) Move to a higher energy level
9) What occurs in both fusion and fission reactions?
A
b) Subtract its atomic number from the mass number.
B
d) Light nuclei are combined into heavier nuclei.
C
a)small amounts of matter are converted into large amounts of energy
D
c) large amounts of energy. C) Heavy nuclei are split into lighter nuclei
10) Compared to a chlorine atom, a chlorine ion -1 has
A
smaller radius
B
larger radius
11) The nucleus of an atom has what charge ?
A
negative
B
positive
C
neutral
12) Compared to a sodium atom, a sodium ion has
A
c) larger radius
B
b) smaller radius
13) What is the electron configuration of a sulfur atom in excited state?
A
d) 2-7-7
B
a) 2-4
C
b) 2-8-6
D
c) 2-8-4
14) Isotopes of potassium-37 and an atom of potassium-42 differ in their total number of
A
b) protons
B
a) electrons
C
c) neutrons
D
d) positrons
15) The joule is a unit of
A
b) pressure
B
c) energy
C
d) volume
D
a) concentration
16) In the ground state, an atom of which element has two valence electrons?
A
Ca
B
Se
C
Na
D
Cr
17) Hydrocarbon are
A
made up of carbon ,hydrogen and oxygen only
B
Sodium can combine with chlorine to produce a salt.
C
made up of carbon only
D
made up of carbon and hydrogen only
18) What occurs when a catalyst is added to a chemical reaction?
A
the same reaction pathway with a lower activation energy
B
the alternate reaction pathway with a lower activation energy
C
the alternate reaction pathway with a higher activation energy
D
the same reaction pathway with a higher activation energy
19) The lower the temperature of a same of water
A
the higher the kinetic energy of the sample
B
the higher the potential energy of the sample
C
the lower the kinetic energy of the sample
D
the lower the potential energy of the sample
20) Which can not broken down ?
A
an element
B
a mixture
C
a compound
*select an answer for all questions
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