Vocabulary
Define "mass"
The amount of matter a substance has
What statement is true of all matter?
A. It has mass
B. It can be seen
C. It maintains its shape and size
A. It has mass
What is the equation for density?
Density= mass/volume
Cathy designs an experiment to investigate how well cups made of different materials maintain the temperature of a cold drink. Which step will increase the accuracy and validity of Cathy’s results?
A. Use a different beverage in each cup
B. Conduct the experiment in a cool room
C. Conduct multiple trials and have another scientist repeat the experiment
C. Conduct multiple trials and have another scientist repeat the experiment
Define "Volume"
The amount of space an object occupies
What is a property that is different on the moon than it is on Earth?
A. Density
B. Mass
C. Weight
C. Weight
What is the volume of a cube that has 10 cm sides?
1000 cm3
(length x width x height)
(10cm x 10cm x 10cm)
Matt has a blue balloon and a red balloon that are the same volume but filled with different gases. The red balloon floats in air, but the blue balloon does not float in air. How does the density of the gas in the balloons compare to the density of the surrounding air?
A. The gases in both balloons are less dense than air
B. The gas in the red balloon is less dense that the air and the gas in the blue balloon is more dense than air
C. The gas in the blue balloon is less dense than the air and the gas in the red balloon is more dense than air
B. The gas in the red balloon is less dense that the air and the gas in the blue balloon is more dense than air
Define "Density"
The relationship between an objects mass and volume
An ice cube changes from a gas to a liquid and finally to a solid. Which property remains unchanged?
A. Volume
B. Mass
C. Density
B. Mass
(the amount of matter does not change as an object changes states of matter)
What is the density of a rock that has a mass of 11.0g and a volume of 5mL? (D=m/v)
D= 2.2 g/mL
(D= 11.0g / 5mL)
If you cut a block into two equal pieces, which of these statements best describes the pieces?
A. The mass of each piece is the same as that of the original block
B. The weight of each piece is the same as that of the original block
C. The density of each piece is the same as that of the original block
C. The density of each piece is the same as that of the original block
(Density is a ratio of mass and volume. Because both mass and volume are halved, the density does not change)
An objects mass times the acceleration rate due to gravity
What property cannot be measured directly?
A. Mass
B. Volume
C. Density
C. Density
(density is determined indirectly by measuring both mass and volume)
What is the volume of a substance if the density is 13.6 g/cm3 and the mass is 10g? (D=m/v)-------> (V= m/D)
v= 0.735 cm3
(V= 10g / 13.6 g/cm3)
Liquid 1: Volume= 10, Density= 0.79, Boiling Point= 56, colorless
Liquid 2: Volume= 50, Density= 0.79, Boiling Point= 78, colorless
Liquid 3: Volume= 10, Density= 1.0, Boiling Point= 100, colorless
Could any of these substances be made of the same substance?
No, none of the liquids could be the same substance because they have different combinations of density, boiling point, and color.
Define "gravity"
The universal force of attraction between anything that has mass
If the volume of a substance doubles, what happens to the density of the object?
A. The density decreases by half
B. The density doubles
C. The density stays the same
A. The density decreases by half
D= m/v
What is the mass of a substance that has a density of 145g/cm3 and a volume of 65cm3 ? (D=m/v)---------> (m= D x v)
m= 9,425
(m= 145g/cm3 x 65cm3)
A scholar tests a hypothesis that the heavier of two materials will insulate cold drinks better than the lighter-weight material. She adds equal volumes of the same cold beverage to two cups. One cup is made of lightweight plastic foam, and the other cup is made of a heavier, ceramic material. She records her results below.
Plastic Foam- 3.25hrs for beverage to warm to room temperature
Ceramic- 2.50hrs for beverage to warm to room temperature
How are these experimental results valuable?
A. The results explain why the materials perform differently
B. She can use the results to form a new hypothesis and plan a new experiment
C. She can use a different heavier material to see if she obtains different results
B. She can use the results to form a new hypothesis and plan a new experiment
(even incorrect hypotheses are valuable when they lead to further investigation)