Aggregate Experiment

Purpose: Weighing objects. Figuring out the density with an object by calculated volume and Archimedes’ Principle.

The amount of mass precipitate that forms could be another physical property used in the method of continuous variation.

The objective of this lab was to calculate the densities of various objects using different techniques.

Introduction: Accuracy and precision were the major aspects of the lab. Accuracy is how close the average of the measured values are to the actual value. Precision is the closeness of repeated measurements. In the lab, the aim was to get as close as possible with both accuracy and precision when determining the mass and volume of the spheres. The mass was determined by weighing the spheres on the Analytical Scale and Triple Beam Balance Scale. The volume is determined by measuring with a ruler and by water displacement. The standard

The mass of salt (.26 grams) was then divided by the total mass of mixture (3 grams) and then multiplied by 100 to get 8.7% salt. The mass of sand was determined by subtracting the 100mL beaker with filter paper and sand (54.57 grams) by the the empty 100mL beaker with filter paper weighing 52.74 grams, to get 1.83 grams of sand. The mass percent of sand was determined by dividing the 1.83 grams of sand by the mass of mixture (3 grams) and multiplying by 100 to get 61%

2. In order to calculate the density of a solid or liquid sample, what measurements are needed?

With volume and mass determined, the density formula (d = m/V) was used to determine the densities of each rock and recorded in g/ml.

2. Measure out 25 to 45 grams of one of the four metals on the trough. This may require several "clicks."

4.) Using a different spatula, place a similar amount of baking soda in wells D,E and F. Again, recording any physical observations you observe.

Which statement most nearly explains why the mass data for the 0.04 mm beads were multiplied by 5 before the data were graphed?

4. Prepare a vacuum filtration apparatus using a buchner funnel. Obtain one filter paper for each one of your samples, weigh them and record their mass in your notebook (label them with a pencil to be able to differentiate them later).

Density (g/mL) was found by dividing the mass (g) of the samples by its volume (mL).

of being able to analyze multiple samples in a short amount of time. The most efficient way of determining concentration is to prepare a set of standard solutions of known

Aggregate is one of the basic constituents of concrete. Its quality is of considerable importance because about three-quarter of the volume of concrete is occupied by aggregates. One of the physical properties of aggregate that influence the property of concrete is the grading of aggregate. The grading of aggregate defines the proportions of particles of different size in the aggregate. The grading of fine (size < 5 mm) and coarse (size > 5 mm) aggregates are generally required to be within the limits specified in BS 882: 1992.

3. Place about 3g of the mixture into the evaporating dish and carefully weigh it to the nearest 0.01g with the top loading scale and record its mass on the data sheet.