This lab is meant to be inquiry-based so the worksheet has a loosely written procedure. Break the Popsicle sticks and crayons into three or four equally sized pieces so that the pieces fit into graduated cylinders. At each lab station, place a marble, Popsicle stick piece, crayon piece and pasta noodle. Prepare and place at each lab station paper cups filled with water, vegetable oil, corn syrup and detergent.
The event requires a basic knowledge of chemistry and physics as they pertain to density, concentrations, gas behavior, and buoyancy. Students must use metric units with correct significant figuresunless instructed otherwise. Possible Hands-On Tasks Students may be required to: For this reason, it is recommended that students practice the hands-on tasks using a variety of instrumentation and techniques.
Density In general, density is a description of the amount of a substance per unit volume or area. There are several common expressions of density, including mass density, number density, and area density.
Usually the term density is used to refer to mass density. Densities are expressed in a variety of different units, depending on what type of density it is and the units used to express the mass, number, area, and volume of the substance. All densities, however, are rates and thus their units follow the general form [Unit of mass or number] per [Unit of volume or area].
For example, the mass density of gold is approximately In general, the density of a material is greatest when it is a solid and decreases as it changes phase to a liquid and from a liquid to a gas. This is not always the case, however; water is less dense as a solid than liquid.
Likewise, within a single phase, density usually decreases with increasing temperature, a phenomenon known as thermal expansion. Conversely, substances within a single phase usually increase in density with decreasing temperature, known as thermal contraction. Mass Density Mass density, usually just called density, is the mass of a substance per unit volume.
The formula for calculating density is shown in the image to the right.
Number Density Number density is the number of countable objects per unit volume. Number density can be calculated for any objects, though it is often used for the density of individual atoms or molecules.
It is important to specify the object the number density refers to when writing the unit.
Area Density Area density is the mass of an object per unit of surface area. It is commonly used for expressing density of objects such as paper or fabrics, whose thickness is not easily found using typical measuring instruments.
Concentrations A concentration is an expression of the amount of one substance that is present in a given amount of a mixture of substances.
Similar to density, the units used to express concentration will depend on the units of mass or volume used to measure the substance and mixture, but are rates and follow the general form [Unit of mass or volume] per [Unit of mass or volume].
For example, the concentration of salts in seawater is approximately 3. For example, if one gram of red dye was added to grams of water, the concentration may be expressed as 0.
Gas Laws Gas laws describe the relationship between key variables of gases. When using gas laws that involve temperature, it is necessary to only use units of absolute temperature.
Absolute temperature scales express absolute zero, the lowest theoretically-possible temperature, as zero on the scale.
Therefore, doubling the temperature on an absolute scale represents a double in the average kinetic energy of the gas particles. The most common scale of absolute temperature is the Kelvin scale. In contrast, Fahrenheit and Celsius temperatures are not absolute and must be converted to an absolute temperature before being used for calculation.
A summary of the gas laws are shown in the image to the right and the table below. Summary of Gas Laws.Beverage Density Lab Density Lab Activities how much solute (solid) is dissolved in the solvent (liquid). If the density of a solution is plotted on a graph against the concentration of solute, a regular pattern is evident—density is proportional to the tip of the pipet to the inside wall of the beaker to help get out most of the.
Density Lab Report Data solid liquid gas Analysis Density is an intensive property, meaning that the identity of a substance can be determined if its density is known Finding the density of a piece of "gold" jewelry can determine whether or not it is actually pure gold.
Density Column Lab - Part 1 In this first part of a two-part lab activity, students use triple balance beams and graduated cylinders to take measurements and calculate the densities of several common, irregularly shaped objects with the purpose to resolve confusion about mass and density.
Laboratory 1E: Density Measurements In this lab either a sealed burret or an open ended burret will be lled half full with water, and the object will be added and the change in volume measured.
liquid it weighs g. What is the density of the unknown liquid? 3. The density of a large block of wood is _____ a small block of wood. *TRICKY* Greater than b.
The same as c. Less than. Which one of the specimens you listed in your data table will float in a beaker of water and which one will sink? EXPLAIN YOUR REASONING!! Density of Water = 1 g/mL DENSITY OF SOLIDS LAB . The Concept and Measurement of Density: Lab Report - Lab Report Title: The Concept and Measurement of Density Purpose: To gain an understanding of the physical property of density.
A triple point is defined, specifically, as “ the temperature and pressure at which the solid, liquid, and vapor phases of a pure substance can coexist in.