Chemistry Gizmo Density PDF

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Gizmo...

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Name:

Ava Faraj

Date:

09/23/2021

Student Exploration: Density Directions: Follow the instructions to go through the simulation. Respond to the questions and prompts in the orange boxes. Vocabulary: density, mass, matter, volume Prior Knowledge Questions (Do these BEFORE using the Gizmo.) 1. List three objects that you think would sink in water, and three objects you think would float. Sink:

Rock, penny, phone

Float:

Basketball, rubber duck, empty water bottle

2. Why do you think some things float and some things sink? Some things float and some things sink due to buoyancy and the relation between mass, volume, and density of the object. Gizmo Warm-up 1. In the Gizmo, drag the apple onto the Scale. The scale measures mass. Mass is the amount of matter, or “stuff,” in an object. What is the apple’s mass? (Note: “g” stands for grams.)

33g

2. An object’s volume is the amount of space it takes up. The volume of an object can be measured by using a graduated cylinder. Observe the graduated cylinder and the blue text showing the volume of water inside the cylinder. A. What is the starting volume of water in the graduated cylinder?

400mL

B. Place the apple into the cylinder. What is the volume in the cylinder now?

444mL

The water rises in the cylinder because it is displaced, or pushed upward, by the apple. The amount of displaced water is equal to the volume of the apple. C. What is the volume of the apple? (Use the Object volume to check.)

44cm3

Note: Milliliters (mL) are used for liquid volumes, while cubic centimeters (cm3) are used for solids. One mL is the same volume as one cm3. The apple’s volume is measured in cm3.

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Get the Gizmo ready:

Activity A:

● Replace all objects on the shelf. ● Be sure the liquid in the beaker is Water.

Sink or float?

Question: How do mass and volume affect sinking and floating? 1. Predict: Which objects do you think will float in water? Which do you think will sink? Record your predictions below in the first column of the table. Object

Prediction (sink or float?)

Mass (g)

Volume (cm3)

Result (sink or float?)

Ping pong ball

Float Sink Sink

3g 45g 33g

36cm3 36cm3 44cm3

Float Sink Float

Float Sink Sink

40g 3g 200g

80cm3 0.4cm 50cm3

Float Sink Sink

Golf ball Apple Chess piece Penny Rock

2. Experiment: Use the Gizmo to find the mass and volume of each object and whether it floats or sinks. Record your results in the table. 3. Analyze results: Look at the data in your table. A. Can you use mass alone to predict whether an object will sink or float? Explain. No, you cannot use the mass alone to predict whether an object will sink or float because different objects with similar masses have different odds of sinking or floating. B. Can you use volume alone to predict whether an object will sink or float? Explain. No, you cannot use volume alone to predict whether an object will sink or float due to the fact that different objects of the same volume have different results in terms of sinking or floating. 4. Draw conclusion: Can you use mass and volume to predict whether an object will sink or float in water? Explain your thinking. Yes, because together with mass and volume you can calculate the density and therefore determine whether an object will sink or float. 5. Apply: Measure the mass and volume of the toy soldier. Mass: 120g

Volume:

80cm3

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Will it float or sink? Sink

Use the Gizmo to test your prediction.

Get the Gizmo ready:

Activity B:

● Replace the objects on the shelves. ● Be sure the liquid in the beaker is Water.

Calculating density

Question: How does density tell you whether an object will sink or float? 1. Calculate: Density is the amount of mass contained in a given volume. To find the density of an object, divide its mass by its volume. Density is recorded in units of grams per cubic centimeter (g/cm3). What is the density of an object with a mass of 100 g and a volume of 50 cm3? 2g/cm3 2. Record data: In the Gizmo, find mass and volume of the objects listed below. Then calculate each object’s density and record it. Finally, test whether each one sinks or floats in water. Density (g/cm3)

Sink or Float?

Rock

0.5g/cm3 4g/cm3

Float Sink

Toy soldier

1.5g/cm3

Sink

Object Chess piece

Apple

0.75g/cm

3

Float

3. Draw conclusion: The density of water is 1.0 g/mL, or 1.0 g/cm3. Look at the data in your table. How can you use the density of an object to predict whether it will sink or float? If the density is less than 1g/mL, it will float. If it is greater than 1g/mL, it will sink. 4. Apply: In the Gizmo, either Crown 1 or Crown 2 is solid gold (but not both). Find the density of the gold nugget and of each crown. (Hint: You will probably need a calculator to do this.)

A. Density of the gold nugget:

19.3g/cm3

B. Density of Crown 1:

8.4g/cm3

C. Density of Crown 2:

19.3g/cm3

D. Which crown is pure gold?

Crown 2

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Activity C:

Get the Gizmo ready:

Egg-speriment

● Replace all the objects on the shelf.

Question: How does an object behave in different liquids? 1. Observe: Use the Gizmo to explore whether the egg sinks or floats in different liquids. Record what you find in the table below. Liquid

Water

Oil

Gasoline

Seawater

Corn Syrup

Sink or Float?

Sink

Sink

Sink

Float

Float

2. Draw conclusion: Which liquids are denser than the egg? Which are less dense? Explain your reasoning. Seawater and corn syrup are more dense than the egg and water, oil, and gasoline are less dense than the egg. The egg floated in seawater and corn syrup, suggesting that it has a lower density than those substances. However, on the other hand, water, oil, and gasoline all caused the egg to sink, which shows that the egg is more dense than those substances. 3. Extend your thinking: Observe the egg in each liquid again. A. In which liquid does the egg float the highest?

Corn syrup

B. In which liquid does the egg sink the fastest?

Gasoline

C. Which liquid do you think is the densest? Least dense? Explain.

I think the most dense liquid is corn syrup and the least dense is gasoline. This is because the egg floated the highest in corn syrup and sank the fastest in gasoline.

4. Challenge yourself: Using the objects in the Gizmo to help you, list the liquids from densest to least dense. Discuss your answer with your teacher and classmates. (Hint: Compare where objects float within each liquid.) Corn Syrup Seawater Gasoline Oil Water

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