Attached you will find the answers for the third lab. I made some changes in your data. I noticed some mistakes in the calculations. Please let me know if you need clarification or edits.
1. In your own words, describe how to calculate density.
The density of a substance is calculated as a division between the mass of the substance (in the
numerator) and the volume of the substance (denominator). The units of density are related
with the units of mass and volume used, normally is expressed as kg/m3, g/cm3 or g/mL.
2. Explain why the metric system is used in science.
To avoid confusion between scientists they agreed to use a system of standard units, the
International System of Units (abbreviated SI). SI units are closely related with the metric units,
that are commonly used in many industrialized nations of the world except for the United
States. Making a comparison with some of the most common physical quantities, the basic
metric unit of mass is the gram (g) rather than the kilogram (kg), the metric unit of volume is
the liter (L) rather than the cubic meter (m3), and the metric unit of temperature is the Celsius
degree (°C) rather than the kelvin. The meter is the unit of length and the second is the unit of
time in both systems. Although SI units are now preferred in scientific research, metric units are
still used in some fields.
3. In any given experiment, how is it possible for your experimental technique to be both accurate
Accuracy tells us how close a measurement is to the true value of the quantity that was
measured. Precision refers to how closely two or more measurements of the same quantity
agree with one another. ...