Chemistry 3rd Set of 4 Sections

3) Convert 129 cm^3 to L

129 L

4) Convert 4.9 × 10^5 μm^3 to mm^3

490 mm^3

2) Convert 0.00722 km^2 to m^2

7.22 m^2

5) A material with a density of 2.7 grams/mL occupies 35.6 mL. How many grams of the material are there?

96.12 g

1) Define accuracy

A measure of how close a measurement is to the correct or accepted value of the quantity being measured

2) Define precision

A measure of how close a series of measurements are to one another

1) What is a derived unit?

A unit that results from a mathematical combination of SI base units

4) A certain liquid sample has a volume of 14.7 mL and a mass of 22.8 grams. Calculate the density.

About 1.55

3) What happens as the accuracy of the measurement decreases?

As the accuracy of a measurement decreases, the percent error of that measurement rises

2) Are gases more or less dense than liquids or solids at room temperature?

Gases are less dense than liquids or solids at room temperature

6) A certain material has a density of 19.3 g/mL. What is the material?

Gold

3) What can be said about the reproducibility of precise values?

Precise measurements are highly reproducible, even if the measurements are not near the correct value

3) How does temperature affect the density of a material?

Since most materials expand as temperature increases, the density of a substance is temperature dependent and usually decreases as temperature increases

1) Define density

The ratio of the mass of an object to its volume. Density=mass/volume

1) Define accepted value

The true or correct value based on general agreement with a reliable reference

2) Define experimental value

The value that is measured during the experiment