Mod 1
Which contains no matter: a baseball, a balloon full of air, heat, or a light ray?
Heat and a light ray contain no matter.
Name the metric base unit for length.
Meter
What phase change occurs when a liquid turns into a gas?
Evaporation
Define density.
Density is mass per unit volume.
What is the difference between a chemical change and a physical change?
Chemical change alters composition; physical change doesn't.
What is the base metric unit for mass?
Gram
What is the term for digits in a measurement that include all known digits plus one estimated digit?
Significant figures
What is the process called when a solid turns directly into a gas?
Sublimation
Which is heavier: a statue made of lead or an identical one made of gold?
The gold statue is heavier.
Why are you warned about using aluminum foil in Experiment 6.1?
It reacts with the chemicals.
What does the metric prefix "milli-" mean?
One thousandth (1/1000)
How many significant figures are in the number 10.020?
5 significant figures
Does sublimation occur when something is heated or cooled?
Heated
Lead has a density of 11.4 g/mL. Gold has a density of 19.3 g/cc. Which is denser?
Gold is denser.
Does sublimation occur when something is heated or cooled?
Heated.
What must all conversion factors equal when written as a fraction?
1
A student combines 50.3 g and 200.24 g but reports the total as 251 g. Why is this incorrect?
The student ignored significant figures, as the answer should have 3 significant figures (251 g should be 251).
If a liquid cools and molecules move closer together, what phase does it become?
Solid
A student calculates density as 0.067129629 g/mL. Identify two errors in this calculation.
The student has too many significant figures and an incorrect volume measurement.
If a liquid’s molecules slow down and move closer, what phase does it turn into?
Solid.
A glass holds 0.05 kL, and another holds 12,000 mL. Which has more liquid?
The glass holding 12,000 mL has more liquid.
Which student is more precise: one measuring 49.8123 g or one measuring 50.1 g?
The student measuring 49.8123 g is more precise.
What makes water an exception to the phase change rule?
Water expands when it freezes.
What is the unit for density when mass is in grams and volume is in milliliters?
g/mL
What makes water an exception to the phase change rule?
Ice is less dense than water.