Question

unit 1 - matter
objectives

1. define mass.

define volume.
give appropriate units for each.

1. demonstrate that you can use a multiple beam balance to determine the mass of various objects. record the value of an objects mass in a manner consistent with the limit of precision of the balance.
2. represent class data using a histogram; use the histogram to interpret trends in the data. sketch a sample at right.
3. develop, from experimental evidence, the law of conservation of system mass.
4. relate the volume of a container (in cm³) to the volume of liquid it contains (in ml).
5. recognize that instruments have a limit to their precision; relate the data recorded to the quality of the measurement.

Explanation:

1. Mass is the amount of matter in an object. Common units include grams (g) and kilograms (kg). Volume is the amount of space an object occupies. Units include cubic - meters (m³), cubic - centimeters (cm³), and liters (L).
2. A multiple - beam balance is used to measure mass. Read the values on its beams accurately according to its precision.
3. To create a histogram, group the class data into intervals, count the frequency of data points in each interval, and plot bars. Analyze trends like peaks, valleys, and symmetry.
4. The law of conservation of system mass states that in a closed system, the total mass remains constant. This can be derived from experiments where the initial and final masses of substances in a reaction or process are measured.
5. 1 cm³ is equal to 1 mL. So the volume of a container in cm³ is numerically the same as the volume of the liquid it contains in mL.
6. Instruments have a limit to how precisely they can measure. The precision of an instrument affects the quality of the data recorded. For example, a more precise instrument gives more reliable data.

Answer:

1. Mass: Amount of matter, units: g, kg. Volume: Amount of space, units: m³, cm³, L.
2. Use multiple - beam balance, read values precisely.
3. Group data, count frequencies, plot bars, analyze trends.
4. In a closed system, total mass is constant (derived from experiments).
5. 1 cm³ = 1 mL.
6. Instruments have precision limits, precision affects data quality.