AnswersWA-Chemistry ACumulative Exam

Cumulative Exam — Cumulative exam Answers

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Which statement best explains why different gases effuse at different rates?

A
At a given pressure, gas particles with smaller masses move faster.
B
At a given pressure, gas particles with smaller masses move slower.
C
At a given temperature, gas particles with smaller masses move faster.
D
At a given temperature, gas particles with smaller masses move slower.
42
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The table describes solids and plasmas.Which statement can be placed in the blank cell to make the information in the table accurate?

Question illustration
A
can be crystalline
B
can be amorphous
C
are made of charged particles
D
are made of neutral particles
43

Consider the diagram.Which postulate of the kinetic-molecular theory best describes the event in the diagram?

Question illustration
A
Most of the volume of a gas is empty space.
B
All collisions between particles are perfectly elastic.
C
There is no force of attraction or repulsion between gas particles.
D
The average kinetic energy of particles depends only on temperature.
44

Which is the formula mass of Na2SO4?

A
119.06 amu
B
125.98 amu
C
142.05 amu
D
174.12 amu
45

Which element would most likely have chemical properties similar to that of fluorine (F)?

A
Ne
B
N
C
Li
D
Br
46

Consider the heating curve.In which region are most particles moving the fastest?

Question illustration
A
2
B
3
C
4
D
5
47

What is the element Ar classified as in the periodic table?

A
a noble gas
B
a halogen
C
a metalloid
D
a metal
48

What else is produced during the combustion of butane, C4H10?2C4H10 + 13O2 8________ + 10H2O

Question illustration
A
H2O
B
C4H10
C
CO2
D
O2
49

How was the work of Newlands similar to that of Mendeleev on the periodic table?

A
They both arranged the elements in order of increasing atomic mass.
B
They both arranged elements that had similar properties into groups.
C
They both predicted the positions of undiscovered elements on the table.
D
They both placed the relative atomic mass of each element on the table.
50

Which is the electron configuration for lithium?

A
1s2
B
2s3
C
1s22s1
D
1s12s2

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