Lab Report Chemistry Lab

Conclusion: The purpose of this lab was to find the relationship between the mass and the volume of the four samples. The densities from least to greatest were shortest(4), short(3), medium(2), and longest(1). Density can vary with temperature, and that could cause errors in the collected data. A real world application of density is icebergs. Icebergs float because they are less dense than the water around them. The icebergs are made of frozen freshwater but they are surrounded by very cold salt water. Initially, salt water has a higher density than freshwater and the low temperatures of the water cause the density to increase even more. The salt water and its increasingly high density allows for the less dense icebergs to float. Knowing this about density is good to know so we can figure out how things in the world work, like how and why massive icebergs float in the middle of the

Now that you know which is more dense, what must be true of the particles that make it more dense?

because each of the objects displaced the water by 1 mL, their mass over that mL is their density.

CHM130 Lab 6 Exploring Density Name A. Data Tables Place your completed Data Tables here Part IIIa (3 points) Volume of water in graduated cylinder (mL)10 mlMass of rubber stopper (g)11.15Volume of water and rubber stopper (mL)16.5 Part IIIb (6 points) Volume of water in graduated cylinder (mL)20Mass of iron nail (g)3.66Volume of water and iron nail (mL)20.5 Part IV (20 points) Type of Aluminum FoilMass (g)Length (cm)Width (cm)Volume (cm3)Thickness (cm)Regular.63g15 cm 10.02 cm.21 cm3.0014 cm Heavy Duty.97g15 cm10.01 cm .36 cm3.0024 cm B. Follow Up Questions Show all work for questions involving calculations. Part I Use the concepts/vocabulary of density to explain why the liquids formed layers in Part I of the procedure. (8 pts)

In this lab, the calculations were based upon mass, volume and their relationship to density. However, a couple of errors made our results have variations. First of all, the graduated cyinder in which the table salt plus water was added was a little wet. So the extra drops of water contributed to the whole mass of the table making out results a little different from the known results. Also, in the “Measuring the density of bearing balls” lab, the diameter of the balls was difficult to measure because of the shape. The balls were spheres and

3. Analyze: What do you notice about the density of the Styrofoam pieces? The density remains the same.

If I fill up two different containers with different amounts of water, then I will be able to understand the density of the two different mass/volumes of two different containers.

2. If we used water displacement to find the volume of the gummy bear instead of the formula (l*w*h) the results would have been much more accurate. This is because the gummy bear is an irregular shaped object, meaning that it doesn't have a specific length, width, and height. Instead, with the formula, we have to measure the parts of the bear that we think will be the most accurate to the actual volume. With water displacement, there is no such problem. To find the volume with water displacement, you just subtract the original height the of water from the height of the water with the object submerged. There is no estimating with water displacement.

Purpose: Weighing objects. Figuring out the density with an object by calculated volume and Archimedes’ Principle.

First we measured two gummy bears and figured out their mass. We put one gummy bear in a ziplock bag and sealed it. Then we measured out 150ml of water and placed it in a cup. We left the gummy bears out for 24 hours. The next day we took the gummy bear in the bag out and measured it to see if it had changed. we then drained all the water out of the plastic cup and attempted to get the measurements. We found the mass for the two gummy bears and then figured out the change in volume. The change in volume for our gummy bear was 121mm for the gummy bear in the plastic bag. Then 4492 mm for the gummy bear in the water. The reason the gummy in the water expanded is that the movement of the water molecules into the gummy bears made it expand. Osmosis

Density is the amount of matter per unit of measurement (Merriam-Webster. Merriam-Webster, n.d. Web. 26 Aug. 2016.). If water has a density of 1.0 g/mL and you place a substance with a density of 1.8 g/mL the substance will sink because it is denser than water. Density is often measured in g/cm^3 or g/mL because the formula for density is D=m/v.

The results show, if more of the bath bomb surface area is exposed ,the volume of the balloon is bigger, thus supporting hypothesis that the more crushed the bath bombs is (more surface is exposed), the larger the circumference of the balloon is. Graph one agrees with the hypothesis and shows an increase in the balloons volume, as more of the bath bombs surface area is exposed. The result show that if there is less of the bath bomb surface area is exposed, the volume of the balloon will be smaller. Table one shows a 75mL difference between the balloon with the least surface area exposed and the balloon with most surface area.

In Measuring and Understanding Density, several experiments were performed to find density of regularly shaped objects, irregularly shaped objects, liquids and gasses. An additional experiment was done to find the specific gravity of a sampling of liquids. The purpose of the experiment was to provide a better understanding of density and to be able to extrapolate unknowns based upon these calculations. The experiments yielded data in keeping with Kinetic-molecular theory in regards to the density of water versus its temperature. Key measurements and formulae were also used to determine densities of metal and plastic objects as well as irregularly shaped rocks. It is possible to find the density of an object (be it liquid, gas or

1) Compare and discuss actual and theoretical results. Are they similar? If there is any discrepancy, what are possible sources of error?

After that, it is crucial to convert the mass to volume. The water density at a temperature will aid this process. The compliance of the Volume Occupied by 1.000g of Water Weigh in Air table is deemed necessary throughout the comparison.