Classify and compare substances on the basis of characteristic
physical properties that can be demonstrated or measured; for
example, density, thermal or electrical conductivity, solubility,
magnetic properties, melting and boiling points, and know that
these properties are independent of the amount of the sample.
Explore and describe the densities of various materials through
measurement of their masses and volumes.
Differentiate between weight and mass recognizing that weight is
the amount of gravitational pull on an object and is distinct from,
though proportional to, mass.
Understand that scientific investigations involve the collection of
relevant empirical evidence, the use of logical reasoning, and the
application of imagination in devising hypotheses, predictions,
explanations and models to make sense of the collected evidence.
Identify test variables (independent variables) and outcome
variables (dependent variables) in an experiment.