Question

mass and volume lab
sep: develop and use models ccc: scale, proportion, quantity
focus question: what is the relationship (if any) between mass and volume? what information from this lab can be used to support or refute phlogiston theory?
pre - lab questions:

1. what happens when a solid object is placed in a graduated cylinder filled with water (archimedes principle of volume displacement). draw a particle model to support your explanation.
2. make a prediction: do you think that the mass of a substance depends on the volume measured? explain your prediction.

Explanation:

1. When a solid object is placed in a graduated - cylinder filled with water, according to Archimedes' principle, the volume of water displaced is equal to the volume of the solid object. A particle model could show water molecules being pushed aside by the solid's particles.
2. The mass of a substance often depends on the volume measured for homogeneous substances. This is because density (mass per unit volume) is a characteristic property. For a given substance with a constant density, mass = density×volume. So, as volume increases, mass increases proportionally.

Answer:

1. The volume of water displaced equals the volume of the solid object. A particle model can illustrate water particles being displaced by solid particles.
2. For homogeneous substances, mass often depends on volume as mass = density×volume, so an increase in volume leads to an increase in mass (assuming constant density).