LAB 2- Density Lab

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Mohave Community College *

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101

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Chemistry

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Feb 20, 2024

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Chapter 2 Lab: Density Lab Answers Madelyn Marcum 01/21/2024 CHM-130 Part 1: Intro 3) Increase the mass using the slider. (2 points each question, 6 points total) What do you notice happens to the volume? In the lab, I noticed what had happened to the volume when I increased the volume as the cube got bigger in mass slower than when volume was increased. What happens to the block? The block since increasing the mass had grown. What happens to the water? What happened to the water was 102.00 L to 104.00 L. 4) Decrease the volume using the slider. (2 points each question, 6 points total) What do you notice happens to the mass? The mass of the cube slowly changes to less. What happens to the block? The block becomes smaller. What happens to the water? The water is reduced is what happened when volume was decreased. 5) Change the drop-down menu to a few other materials (Styrofoam, aluminum, brick, etc.). (2 points each question/each material, 12 points total) Two Materials chosen: Styrofoam & Ice For at least two of those materials, what do you notice happens to the mass? For Styrofoam the mass is extremely light making it easy to float and volume is the sa Ice has the same amount of mass to volume ratio and the mass remains the same. What happens to the block? Styrofoam’s mass only goes up to 1.50 kg, its volumes max is 10.00L which is also why it floats just above the water. Ice’s mass however is heavier making it barely able to float.

What happens to the water? Water for Styrofoam barely changes by 1.0 whereas ice effects the Water and changes by 8.00 L. 6)Now set the drop-down menu to “custom.” 7) Play with the mass and volume. (2 points each question, 6 points total) What do you have to do to make the block float? For the custom to float mass should Be severely decreased making its mass 0.50kg approx. What do you have to do to make the block sink? For the custom to sink mass should be Severely increased making its mass 10.00kg approx. Is there anything else you notice? If volume is at its lowest of 1.00L-5.00L it’ll remain at sinking level, making its mass from 5.50kg-10.00kg to remain beneath the water as well. Human density is 0.94 kg/L its mass would be 4.72kg approx., and its volume is 5.00L. Glass density is 2.70kg/L, mass is 10.00kg, and volume is 3.71L Titanium density is 4.48kg/L, mass is 10.00kg, and volume is 2.23L Steel density is 7.81kg/L, mass is 10.00kg, and volume is 1.28L Copper density is 8.93kg/L, mass is 10.00kg, and volume is 1.12L Cube becomes smaller as volume is decreased; mass remains the same at 10.00kg for all the Several types of materials in the simulator. Part Two: Compare 4) Put one block in the water. (2 points each question, 8 points total) What do you notice? Remove the block from the water. Repeat this process with every other block. Red smallest block automatically sinks to the bottom meaning its mass is bigger than its volume. Green small block automatically sinks as well, reaching the same conclusion as the red block. Blue bigger block automatically sinks as well, reaching the same conclusion as red + blue block. Yellow biggest block is half sunken half floating making its volume and mass almost close in number.

5) Adjust the Mass using the slider. (2 points each question, 4 points total) What happens to the blocks as you Increase the mass? Red block does not change, still is sunken and does not change in appearance either. Green block does not change and is still sunken and does not change in appearance. Blue block also does not change, still sunken beneath water and did not change in appearance. Yellow block has changed barely able to float to surface but hasn’t fully sunk to the bottom either appearance is the same size. What happens to the blocks as you decrease the mass? Red block is 3/4 sunken, 1/4 floating above beneath water. Green block is 2/3 floating above the surface, 1/3 beneath water. Blue block is 3/4 floating above the surface, and 1/4 beneath water. Yellow block is 7/8 floating above the surface, and 1/8 beneath water. 6) Experiment with putting different blocks on top of each other. (2 points each question, 4 points total) Are there ways you can make a block Sink that would normally Float by doing this? By having a Mass between 1.00kg-2.93kg all blocks can remain afloat and stacking all the littler blocks on the Yellow block too. What about making a block float that would normally sink? Placing any of the blocks atop the yellow blocks are able to float. 7) The yellow, biggest block and the red, smallest block have the same mass. But one floats and one sinks. (2 points each question, 4 points total) Why do you think that is? One has a bigger volume to be unaffected by its mass (the yellow block), whereas the red block ha A smaller volume/size unable to be unaffected by its mass. 8) Throw all four blocks into the water. (2 points each question, 6 points total) Which one's float? Red and green blocks float Which ones do not? Yellow and blue blocks sink Why do you think that is? All have different mass range, yellow is 8.00kg, red is 2.00kg Blue is 6.00kg, and green is 4.00kg. 9) What happens when you decrease the volume of the blocks? (2 points each question, 4 points total) When decreased to its lowest volume and different range of

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mass of 2, 4, 6, and 8 kg the blocks sink. What happens when you increase it? When increased volume the blocks are able to float but at various levels of floatation. 10) Experiment with putting different blocks on top of each other. (2 points each question, 4 points total) Are there ways you can make a block sink that would normally float by doing this? There isn’t a Way to make the non-floatable blocks float because the lower massed blocks sink when the other Blocks are stacked to help make the non-floatable one's float. What about making a block float that would normally sink? Lower levels of mass are successful ways to make a block float. 11) All four blocks have the same volume, but they have different masses. (2 points each question, 4 points total) But some float and some sink. Why do you think that is? The heavier the mass of the block and smaller the volume the greater the inability of it being able to float, whereas a bigger volume is more likely to succeed in floating even The heaviest mass like the 8.00kg cube can float. PART 3: MYSTERY 12) Based on what you read or watched, develop a procedure for determining the density Of each block. (6 points total) Based on the article on how an object can float I learned that density equals mass over volume, meaning the bigger the volume can outweigh the mass of an object. Block 1A (Kg) Mass 19.30 (L) Volume 5.50 Density 3.5090909

Block 1B Mass 0.40 Volume 0.40 Density 1 Block 1C Mass 19.32 Volume 1.00 Density 19.32 Block 1D Mass 5.00 Volume 5.00 Density 1 Block 1E Mass 2.80 Volume 2.80 Density 1 Density= m/v In response, the reason the log floats is that their mass is smaller than their volume making its density less than water. When wood is less dense than water, the wood will float in the water no matter the size. For the rock, the reason the pebble sinks are that its mass is bigger than its volume (or size). This means that if the rock's density is more than water it will sink, but if it is less dense than water it will float. Thus, the reason a piece of wood would float, whereas the pebble would sink.