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**Gizmo** **DENSITY LAB Answer Key (Student Exploration)**

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

**Prior Knowledge Questions (Do these BEFORE using the Gizmo) – Answers Revealed**

**Q.1. **Of the objects above, circle/mention the ones you think would float in water.**Ans: **Cruise ship, Saturn, Beach ball

**Q.2. **Why do some objects float, while others sink?**Ans: **An object floats when the weight of the liquid it displaces is equal to the weight of the object. Object sink when they are heavier than the equivalent volume of liquid. In other words, objects sink when they are denser than liquid.

**Gizmo Warm-up Questions & Answers**

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.

**Q.1. **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 object1.). What is the mass of object1?**Ans: **19.5 g

**Q.2. **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.**A. **What is the initial volume of water in the cylinder?… **Ans:** 400.0ml**B. **Place object1into the cylinder. What is the volume in the cylinder now?… **Ans:** 414.0ml**C. **What is the volume of the object?… **Ans:** 14.0cm^3

**Q.3.** Drag object 1 into the beaker of liquid. Does it sink or float?**Ans:** sink

**Gizmo** **DENSITY LABS Answer Key** – Activity A

**DENSITY LABS Answer Key**– Activity A

**Q.1. **Observe: Experiment with the different objects in the Gizmo. Observe the mass and volume of each object, then drag it into the beaker of liquid to see if it floats or sinks. (Notice a pinholds objects in the graduated cylinder, whether they sink or float.) Try to determine what the floating objects have in common and what the sinking objects have in common.**Ans:** ***This part has to be done by you***

**Q.2. **Form hypothesis: Compare the floating objects, then do the same for the sinking objects.**A. **What do the floating objects have in common? They all had high volume?… **Ans: **The floating objects all have greater volumes compared to their masses.**B. **What do the sinking objects have in common? Most of them had high mass?… **Ans: **They have greater masses compared to their volumes.

**Q.3. **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.**Ans: *****Find the answers in the table below***

Object | Mass (g) | Volume (cm^3) | Float or sink? | Density (g/cm^3) |

1 | 19.5g | 14.0cm^3 | sink | 1.39g/cm^3 |

2 | 11.0g | 9.0cm^3 | sink | 1.22 g/cm^3 |

3 | 4.0g | 5.0cm^3 | float | 0.80 g/cm^3 |

4 | 135.0g | 7.0 cm^3 | sink | 19.29 g/cm^3 |

5 | 4.0g | 3.5 cm^3 | sink | 1.14 g/cm^3 |

6 | 78.0g | 29.0 cm^3 | sink | 2.69 g/cm^3 |

7 | 2.0g | 21.0 cm^3 | float | 0.10 g/cm^3 |

8 | 24.0g | 26.0 cm^3 | float | 0.92 g/cm^3 |

9 | 99.0g | 44.0 cm^3 | sink | 2.25 g/cm^3 |

10 | 42.0g | 61.0 cm^3 | float | 0.69 g/cm^3 |

11 | 65.0g | 40.0 cm^3 | sink | 1.63 g/cm^3 |

12 | 104.0g | 114.0 cm^3 | float | 0.91 g/cm^3 |

**Q.4. **Analyze: Look carefully for patterns in your data.**A. **Does mass alone determine whether an object will float or sink?… **Ans: **No. Because The mass does not matter because some are higher and some are lower compared to others.**B. **Does volume alone determine whether an object will float or sink?… **Ans: **No. Because You have to look at volume and mass in order to see if the object will float or sink.**C. **Compare the mass and volume of each object. What is true of the mass and volume of all the floating objects?… **Ans:** The mass is smaller for the objects that float.**D. **What is true of the mass and volume of all the sinking objects?… **Ans:** The sinking objects have a greater mass than their volume.

**Q.5. **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 the mass is measured in grams and volume in cubic centimeters, the unit of density is grams per cubic centimeter (g/cm3). Calculate the density of each object, and record the answers in the last column of your data table. Label this column “Density (g/cm3).”**Ans: *****This part has to be done by you***

**Q.6. **Analyze: Compare the density of each object to the density of the liquid, 1.0 g/mL. This is the density of water.**A. **What do you notice about the density of the floating objects?… **Ans: **The density of the floating objects is less than 1 g/cm^3**B. **What do you notice about the density of the sinking objects?… **Ans: **The density of the sinking objects is greater than 1 g/cm^3

**Q.7. **Draw conclusions: If you know the mass and volume of an object, how can you predict whether it will float or sink in water?**Ans: **To predict if the object will sink or float, compare the mass to volume. If the mass is larger, the object will sink, if the volume is larger, the object will float.

**Gizmo** **DENSITY LABS Answer Key** – Activity B

**DENSITY LABS Answer Key**– Activity B

**Q.1. **Observe: Place object1into the beaker of liquid. Slowly move the liquid density slider back and forth. What do you notice?**Ans: **the higher the liquid density became the more object 1 started to float.

**Q.2. **Form a hypothesis: Buoyancy is the tendency to float. How do you think the liquid density affects the buoyancy of objects placed in the liquid?**Ans: **The density of a liquid does significantly impact the buoyancy of an object.

**Q.3. **Predict: In the table below, write the density of each object. Then predict whether the object will float or sink in each of the fluids. Write “Float” or “Sink” in each empty box of the table.**Ans: *****Find the answers in the table below***

Object | Object Density | 0.5 g/ml | 1.0 g/ml | 2.0 g/ml |

1 | 1.39g/cm^3 | Sink | Sink | Float |

2 | 1.22 g/cm^3 | Sink | Sink | Float |

3 | 0.80 g/cm^3 | Sink | Float | Float |

4 | 19.29 g/cm^3 | Sink | Sink | Sink |

5 | 1.14 g/cm^3 | Sink | Sink | Float |

**Q.4. **Test: Test your predictions using the Gizmo. Place a checkmark (/) next to each correct prediction, and an “X” next to each incorrect prediction.**Ans:** ***This part has to be done by you***

**Q.5. **Draw conclusions: What is the relationship between the object density, the liquid density, and the tendency of the object to float?**Ans: **The higher the liquid density and the lower the object’s density the object will more likely to float.

**Gizmo** **DENSITY LABS Answer Key** – Extension

**DENSITY LABS Answer Key**– Extension

**Q.1. **Think about it: Gold is one of the densest substances known, with a density of 19.3 g/cm3. If the gold in the crown was mixed with a less-valuable metal like bronze or copper, how would that affect its density?**Ans: **It would significantly reduce the amount density of the crown, making it float easier than if the crown were made from pure gold.

**Q.2. **Observe: Drag each of the crowns into the liquid. Based on what you see, which crown do you think is densest? Explain why you think so.**Ans: **Crown B sinks most quickly in the liquid, so crown B is probably the densest of the crowns.

**Q.3. **Measure: Find the mass, volume, and density of each of the three crowns.**Ans:**

Crown | Mass (g) | Volume (cm^3) | Density (g/cm^3) |

A | 325.0g | 65.0cm^3 | 5.00 g/cm^3 |

B | 1250.0g | 65.0cm^3 | 19.23 g/cm^3 |

C | 306.0g | 65.0cm^3 | 4.71 g/cm^3 |

**Q.4: **Draw conclusions: Which of the three crowns was made of gold?**Ans: **Crown 3, only crown B had a density close to the density of pure gold which is 19.3 g/cm^3.

Above are the **correct answers **for the **Gizmo** topic “**Density Lab**“. Now let us bring you a glimpse of Density Labs & the different steps to do it in the right way.

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**About Gizmo Density Lab**

Gizmo Density Lab is an educational program designed to help students explore the physical laws of matter. Using a variety of interactive activities and tools, students can learn how things like density, buoyancy, and other forces shape the world around us. The lab includes experiments that allow learners to discover different concepts in depth, as well as activities that can be tailored to their own interests.

With Gizmo Density Lab, students can develop a deeper understanding of the physical properties of matter and how they interact with each other. By engaging in these activities, learners can gain valuable knowledge that will help them succeed in school and beyond.

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