To accurately measure the density of a series of small irregular solids made of plastic, wood, fiberglass, and glass, which of the following laboratory tools will a student need?
Graduated cylinder, water, weighing balance.
To accurately measure the density of irregular solids, a student needs to determine both mass and volume. A weighing balance is essential for measuring mass, while a graduated cylinder filled with water allows for the measurement of volume through water displacement.
This combination of tools is ideal for measuring the density of irregular solids. The weighing balance provides an accurate mass measurement, and the graduated cylinder, when filled with water, facilitates the determination of volume through displacement. The density can then be calculated using the formula density = mass/volume.
While the weighing balance is useful for measuring mass, the Bunsen burner is unnecessary for density measurement and does not contribute to volume assessment. The metric ruler may help in measuring dimensions of regular solids, but it is not suitable for determining the volume of irregular shapes, which require water displacement.
The graduated cylinder and water are appropriate for measuring volume, but the spectrophotometer is not relevant to density measurement. It is designed for analyzing light absorption and concentration rather than measuring physical properties like mass or volume.
Using a graduated beaker can offer some volume measurement capabilities, but it is less precise than a graduated cylinder for displacement methods. The metric ruler is again ineffective for measuring the volume of irregular solids, leading to an inaccurate determination of density.
To measure the density of irregular solids accurately, one must use a weighing balance for mass and a graduated cylinder with water for volume measurement via displacement. Choices B, C, and D lack the necessary tools or precision required for accurate density calculations, highlighting the importance of selecting the correct laboratory tools for the task.
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