Gizmos Student Exploration: Density Laboratory Answer Key 100% Correct Verified Answers Guaranteed A+: Latest 2023:2024

I.4.b_Density Laboratory Name:

Vocabulary: buoyancy, density, graduated cylinder, mass, matter, scale, volume

Prior Knowledge Questions (Do 1 and 2 BEFORE using the Gizmo.)

1. Of the objects below, circle the ones you think would sink in water.

2. Why do some objects float, while others sink?

Objects with tightly packed molecules are denser than water therefore they sink.

Objects with more loosely packed molecules are less dense than water and therefore

they float.

Gizmo Warm-up

The Density Laboratory Gizmo™ allows you to measure a variety of objects, then drop them in

water (or other liquid) to see if they sink or float.

3. An object’s mass is the amount of matter it contains. The mass of an

object can be measured with a calibrated scale like the one shown in

the Gizmo. Drag the first object onto the Scale. (This is object 1.) What

is the mass of object 1?

19.5 g

An object’s volume is the amount of space it takes up. The volume of an

irregular object can be measured by how much water it displaces in a

graduated cylinder. Place object 1 into the Graduated cylinder.

What is the volume of object 1?

14.0 cm3

Note: While milliliters (mL) are used to measure liquid volumes, the equivalent unit cubic

centimeters (cm3

) are used for solids. Therefore, write the volume of object 1 in cm3

.

4. Drag object 1 into the Beaker of liquid. Does it sink or float? Sink

Activity A: Float or sink?

 Get the Gizmo ready:

• Drag object 1 back to the shelf.

• Check that Liquid density is set to 1.0 g/mL.

Question: How can you predict whether an object will float or sink?

5. Observe: Experiment with the different objects in the Gizmo. Try to

determine what the floating objects have in common and what the sinking objects have in

common.

6. Form hypothesis: Compare the floating objects, then do the same for the

sinking objects.

A. What do the floating objects have in common? All objects that float have a

density less than one but

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some objects weigh less and

float to the top faster.

B. What do the sinking objects have in common? They all have a density

greater than one and some

sink faster than others.

7. Collect data: Measure the mass and volume of objects 1 through 12, and

record whether they float or sink in the table below. Leave the last column blank for now.

Object Mass

(g)

Volume

(cm3

)

Float or

sink? Density (g/cm3

)

1 19.5 g 14.0 cm3 Sink 1.4 g/cm3

2 11.0 g 9.0 cm3 Sink 1.2 g/cm3

3 4.0 g 5.0 cm3 Float 0.8 g/cm3

4 135.0 g 7.0 cm3 Sink 19.3 g/cm3

5 4.0 g 3.5 cm3 Sink 1.1 g/cm3

6 78.0 g 29.0 cm3 Sink 2.7 g/cm3

7 2.0 g 21.0 cm3 Float 0.1 g/cm3

8 24.0 g 26.0 cm3 Float 0.9 g/cm3

9 99.0 g 44.0 cm3 Sink 2.3 g/cm3

10 42.0 g 61.0 cm3 Float 0.7 g/cm3

11 65.0 g 40.0 cm3 Sink 1.6 g/cm3

12 104.0 g 114.0 cm3 Float 0.9 g/cm3

8. Analyze: Look carefully for patterns in your data.

A. Does mass alone determine whether

an object will float or sink?

No

Explain: No, mass is not the only factor in play

when determining if an object will sink or

float, volume also plays a role. Though as

the mass increases generally the object is

more likely to sink.

B. Does volume alone determine

whether an object will float or sink?

No

Explain: No, volume does not alone determine

whether or not an object will sink or float,

mass also plays a role. Though as volume

increases the object is more likely to float.

C. What is true of the mass and volume

of all the sinking objects?

The mass and volume of all the sinking

objects is greater than the density of the

water.

9. Calculate: The density of an object is its mass per unit of volume. Dense

objects feel very heavy for their size, while objects with low density feel very light for their

size.

 To calculate an object’s density, divide its mass by its volume. If mass is measured in

grams and volume in cubic centimeters, the unit of density is grams per cubic

centimeter (g/cm3

).