PSA EXAM QUESTIONS WITH 100%
SOLVED SOLUTIONS!!
1 of 86
Term
AN experiment in which only one variable, the manipulated variable,
is changed at a time, is called_--
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Random experiment Blind experiment
Comparative experiment Controlled experiment
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2 of 86
Term
The nuclei of isotopes contain different number of ______
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protons nuetrons
ions metalloids
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3 of 86
Term
What are the 3 common clues a chemical change has
occured
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color change
sublimation- solid-
gas gas production
formation of percipatate
, conservation of mass chain reaction
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4 of 86
Term
If element Q has 11 protons, its atomic s 11
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number mass
size charge
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5 of 86
Term
88. A sample of uranium-238 is heated from room
temperature to 55°C. How will increasing the
temperature of the sample affect the half-life of the
radioisotope?
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, will fluctuate, as temperature will not change, cannot
alters atomic structure alter a half life
will decrease, as will increase, as temperature
temperature accelerates stabilizes the isotope
decay
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6 of 86
Term
How is the composition of a substance different from the
composition of a mixture?
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A pure substance is an
A pure substance is made from
element or a compound
various substances, but a
but a mixture is made
mixture is a single element
from various substances
A pure substance is a
A mixture is chemically
single element, but a
bonded, but a pure substance
mixture is a compound
is not
Don't know?
7 of 86
SOLVED SOLUTIONS!!
1 of 86
Term
AN experiment in which only one variable, the manipulated variable,
is changed at a time, is called_--
Give this one a try later!
Random experiment Blind experiment
Comparative experiment Controlled experiment
, Don't know?
2 of 86
Term
The nuclei of isotopes contain different number of ______
Give this one a try later!
protons nuetrons
ions metalloids
Don't know?
3 of 86
Term
What are the 3 common clues a chemical change has
occured
Give this one a try later!
color change
sublimation- solid-
gas gas production
formation of percipatate
, conservation of mass chain reaction
Don't know?
4 of 86
Term
If element Q has 11 protons, its atomic s 11
Give this one a try later!
number mass
size charge
Don't know?
5 of 86
Term
88. A sample of uranium-238 is heated from room
temperature to 55°C. How will increasing the
temperature of the sample affect the half-life of the
radioisotope?
Give this one a try later!
, will fluctuate, as temperature will not change, cannot
alters atomic structure alter a half life
will decrease, as will increase, as temperature
temperature accelerates stabilizes the isotope
decay
Don't know?
6 of 86
Term
How is the composition of a substance different from the
composition of a mixture?
Give this one a try later!
A pure substance is an
A pure substance is made from
element or a compound
various substances, but a
but a mixture is made
mixture is a single element
from various substances
A pure substance is a
A mixture is chemically
single element, but a
bonded, but a pure substance
mixture is a compound
is not
Don't know?
7 of 86
