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PLATO Course Chemistry, Semester A, Unit 1
Atoms and Elements QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS)
|ALREADY GRADED A+
Which sentence is a scientific statement? - .....ANSWER...
✔✔ Brick structures insulate better than wooden
structures.
Which probing question lies within the scope of physics?
- .....ANSWER... ✔✔ Does increasing the saltiness of
ocean water affect the speed of sound in the water?
Identify the type of scientific knowledge represented by
each statement. - .....ANSWER... ✔✔ If a certain
piece of metal is cooled, it will conduct electricity
better.------->hypothesis
The amount of electric current that passes through a
conductor is directly proportional to the voltage and is
described by the formula V = IR.----->law
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Electricity is the flow of electric charge in the form of
electrons moving through a circuit.------>theory
Under what circumstances will a scientific theory be
changed or discarded? - .....ANSWER... ✔✔ New
experimental evidence is not compatible with the theory.
_______1______-is the use of reliable knowledge for a
practical purpose.
_______2______is the study of the natural world
through observation and experimentation. -
.....ANSWER... ✔✔ 1. NOT hypothesis
2. Science
Why are prefixes often added to SI units? -
.....ANSWER... ✔✔ to communicate very large or
small measurements
Why do scientists use models? - .....ANSWER... ✔✔
Models help scientists visualize things they can't see.
Scientists can analyze models to make predictions.
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(Also another one, i don't know for sure but possibly
Models make some things easier to understand.)
Which tool is most suitable for a chemist to measure the
mass of a liquid? - .....ANSWER... ✔✔ electronic
balance
Classify each substance as a pure substance or a
mixture. - .....ANSWER... ✔✔ PURE SUBSTANCE
copper, which consists of only one kind of atom
carbon dioxide, which has two atoms of oxygen for
each atom of carbon
table salt, which can be separated into sodium and
chlorine only by chemical processes
MIXTURE
seawater, which can be purified by filtering it
a solution of sugar dissolved in water
PLATO Course Chemistry, Semester A, Unit 1
Atoms and Elements QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS)
|ALREADY GRADED A+
Which sentence is a scientific statement? - .....ANSWER...
✔✔ Brick structures insulate better than wooden
structures.
Which probing question lies within the scope of physics?
- .....ANSWER... ✔✔ Does increasing the saltiness of
ocean water affect the speed of sound in the water?
Identify the type of scientific knowledge represented by
each statement. - .....ANSWER... ✔✔ If a certain
piece of metal is cooled, it will conduct electricity
better.------->hypothesis
The amount of electric current that passes through a
conductor is directly proportional to the voltage and is
described by the formula V = IR.----->law
,2|Page
Electricity is the flow of electric charge in the form of
electrons moving through a circuit.------>theory
Under what circumstances will a scientific theory be
changed or discarded? - .....ANSWER... ✔✔ New
experimental evidence is not compatible with the theory.
_______1______-is the use of reliable knowledge for a
practical purpose.
_______2______is the study of the natural world
through observation and experimentation. -
.....ANSWER... ✔✔ 1. NOT hypothesis
2. Science
Why are prefixes often added to SI units? -
.....ANSWER... ✔✔ to communicate very large or
small measurements
Why do scientists use models? - .....ANSWER... ✔✔
Models help scientists visualize things they can't see.
Scientists can analyze models to make predictions.
, 3|Page
(Also another one, i don't know for sure but possibly
Models make some things easier to understand.)
Which tool is most suitable for a chemist to measure the
mass of a liquid? - .....ANSWER... ✔✔ electronic
balance
Classify each substance as a pure substance or a
mixture. - .....ANSWER... ✔✔ PURE SUBSTANCE
copper, which consists of only one kind of atom
carbon dioxide, which has two atoms of oxygen for
each atom of carbon
table salt, which can be separated into sodium and
chlorine only by chemical processes
MIXTURE
seawater, which can be purified by filtering it
a solution of sugar dissolved in water
