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A pycnometer is a device for measuring the density of liquids. It is a glass flask with a close-fitting ground glass stopper having a capillary hole through it. (a) The volume of the pycnometer is determined by using distilled water at $20^{\circ} \mathrm{C}$ with a known density of $0.99820 \mathrm{g} / \mathrm{mL} .$ First, the water is filled to the rim. With the stopper in place, the fine hole allows the excess liquid to escape. The pycnometer is then carefully dried with filter paper. Given that the masses of the empty pycnometer and the same one filled with water are $32.0764 \mathrm{g}$ and $43.1195 \mathrm{g},$ respectively, calculate the volume of the pycnometer. (b) If the mass of the pycnometer filled with ethanol at $20^{\circ} \mathrm{C}$ is $40.8051 \mathrm{g},$ calculate the density of ethanol. (c) Pycnometers can also be used to measure the density of solids. First, small zinc granules weighing $22.8476 \mathrm{g}$ are placed in the pycnometer, which is then filled with water. If the combined mass of the pycnometer plus the zinc granules and water is $62.7728 \mathrm{g},$ what is the density of zinc?

a. The volume of pycnometer is $11.063 \mathrm{mL}$b. The density of ethanol at 20 degrees Celsius is $0.7890 \mathrm{g} / \mathrm{mL}$c. The density of zinc is $7.1398 \mathrm{g} / \mathrm{mL}$

Chemistry 101

Chapter 1

Chemistry: The Study of Change

Intro to Chemistry

Shahad M.

September 30, 2021

For a particle moving along an x axis, the graph here gives the particle's acceleration a versus time t. At t = 0, the particle's velocity is v0 = 7.5 m/s. What is its velocity at t = 9.0 s?

Carleton College

University of Central Florida

Rice University

University of Maryland - University College

Lectures

02:29

Chemistry is the science of matter, especially its chemical reactions, but also its composition, structure and properties. Chemistry deals with atoms and their interactions with other atoms, and particularly with the properties of chemical bonds. Chemistry also involves understanding the properties and interactions of individual atoms and molecules for use in larger-scale applications.

04:42

In chemistry and physics, matter is any substance that has mass and takes up space by having volume. All everyday objects that can be touched are ultimately composed of atoms, which are made up of interacting subatomic particles, and in everyday as well as scientific usage, "matter" generally includes atoms and anything made up of them, and any particles and objects that act as if they have both rest mass and volume. However it does not include massless particles such as photons, or other energy phenomena or waves such as light or sound. Matter exists in various states (known as phases) that are defined by various physical properties, such as state of matter, phase, shape, and density. The Standard Model of particle physics and the general theory of relativity describe fundamental particles and the fundamental forces acting between them that control the structure and dynamics of matter.

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the pick. Tom Inner is a very sensitive tool with a pick. No meter is very sensitive tools. It allows us to determine density. First thing we'll do is figure we'll figure out the volume of the pick no meter by taking the mass of the water that was added and the which is the difference in mass between what we started with or difference between the empty and the vessel containing water. And then use the density of water to figure out the volume of water, which will be the volume of the pick, no meter and then figure out the density of ethanol. We need to take the massive ethanol, which will be the difference between the pick millimeter are the pick Nam iter, um with ethanol in it, minus the density without the ethanol. And then it will be divided by the volume of the container, which we just figured out. Now we get 0.78900 grams per mil leader. How to figure out the density of sink. This one's a little bit more tricky, will take the massive zinc and then down here we need to know the volume of think well if we take the volume of the container minus the volume that is being occupied by the water, which is this difference right here. We've got eso. This right here is going to give us the volume of the, um container. Um, that is water. So the total volume is a container. Then we've got the massive with everything in it minus the massive zinc minus the mass. It is the empty container. This is the massive Just water. Well, then use the density of water in order to get the mill leaders of water. So this is the mill leaders of the entire container. This is the middle leaders of water. That difference is the mill leaders of zinc. So the massive zinc divided by the middle leaders of zinc gives us the density of sank 7.140 grams per mil Leader

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