Practice Test
Chapter 1
Answers
1.
Problem: Galen wanted to discover the best
insulator for keeping drinks cold.
Manipulated
Variable: Different types of
insulating materials.
Controlled
Variables: Original temperature of
the water, original temperature of the glass, same time in the Sun, same size
of glass, same type of thermometer, 1 cm thick of each insulation, and 250 mL
of water in each glass.
Quantitative
Data: Any of the final temperatures. The temperature in the aluminum foil insulation was 18
degrees C after 30 minutes.
2. To measure the volume of a liquid
precisely you would use a graduated cylinder because it is divided up into 1 mL
units.
3. Mass is a measure of the amount of
matter (atoms) in an object or substance.
Weight is a force determined by gravity’s affect on the mass of an
object. Weight is mass x
gravity. The units for mass are
grams. The units for weight are
Newtons (kg x m/s2).
As gravity
increases, so does weight. As
gravity decreases, weight decreases.
There may be no change in mass (no atoms gained or lost).
If I have a mass
of 20 kg on Earth and I snapped my fingers and went to the Moon, my mass would
stay the same (I haven’t gained or lost molecules). My weight would go down because the Moon has a smaller
gravitational pull than the Earth.
I would weigh about 44 pounds on Earth and about 7.3 pounds on the Moon.
4. The graph shown below has uneven
intervals on the x-axis for distance.
If you don’t make intervals equal, the trend shown in the graph (the
slope of the line) will not match your data.
