 a
Physical Sciences Concepts: The
student produces evidence that demonstrates understanding of properties
and changes of properties in matter, such as density….
 
There is clear evidence here and throughout the work that the student
understands how volume and mass relate to density.
 Although the
student has a misconception (air does not have zero mass, and this
should be corrected in a revision), the student does describe density
in terms of volume and mass.
 a
Scientific Connections and Applications:
The student produces evidence that demonstrates understanding of
big ideas and unifying concepts, such as order…; change and
constancy; and cause and effect.
 
There are several places in this work where the student acknowledged
that volume can remain constant and yet, if mass increases or decreases,
the density is changed.
 The student
provided evidence of understanding that if the density of an object
is less than 1.0 g/ml the object will float in water.
 b
Scientific Thinking: The
student uses concepts from Science Standards 1 to 4 to explain a
variety of observations and phenomena.
The conclusion
ties together the concept of density and why objects in the experiment
floated and why some sank. This shows that the student was able
to use her conceptual understanding of density to predict whether
an object would float or sink given information about the density
of the medium into which the object is placed and the density of
the object.
c
Scientific Thinking: The student
uses evidence from reliable sources to develop descriptions, explanations,
and models.
Throughout the work the student used information from reliable sources.
One source was direct experimentation. However, the student took
information, whether from the teacher or some other source, and
explained some sophisticated concepts in her own voice.
e
Scientific Thinking: The
student evaluates the accuracy, design, and outcomes of investigations.
 The student
identified several reasonable sources of measurement error.
f
Scientific Thinking:
The student works individually and in teams to collect and share
information and ideas.
 a
Scientific Tools and Technologies: The
student uses technology and tools (such as traditional laboratory
equipment…) to…measure objects…indirectly….
 The student
determined the volume of the balloon by using the formula for a
sphere.
 The student
determined the volume of an irregularly shaped object by using water
displacement.
 a
Scientific Communication:
The student represents data and results in multiple ways, such as
numbers, tables, and technical…writing.
 The student
presented data in tabular form and analyzed the data in writing.
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