Part B: Density of a Cylindrical Solid 1) Obtain a cylindrical solid and measure its mass. 2) Measure diameter and divide by 2 for the radius, and measure height. 3) Determine the volume by means of πr2h. 4) Determine the density and percent error. Part C: Density of an Irregular Shaped Solid 1) Obtain a sample of metal and determine the mass.
I. Introduction Calorimetry is a used to determine the amount of heat transfer in a chemical reaction. It can measure one of two things: the amount of heat that is absorbed (in an endothermic process) or the amount that is gained (in an exothermic process). To conclude the calorimetry of a substance, the equation below is used: Eq. 1 q= Cs x g x T Q represents heat.
Dimensional analysis and use of conversion factors in calculations. * Equalities and prefixes involving relationships on Table 1.5 (page 14), and between the following units: Angstrom (Å) and m; g and µg; g and mg; g and kg; ml and µl; ml and L; cm and m; cm and km; in and cm; in and m. * Measurement and calculations involving with Density and Specific Gravity of a substance (Density is mass per unit volume of a substance: d
Why is it important to determine these physical properties of a substance? The melting point of a solid is the point at which a solid becomes a liquid with standard atmospheric pressure. The boiling point of a liquid equals the external pressure. It is important to know these characteristics of a substance so that you can handle them in the correct manner. The boiling point and melting point can also be used to identify an unknown substance.
Water samples from the Clark Fork have been taken and will be tested using both absorption and emissions spectroscopy in order to check the levels of group IA and IIA metal ions. When electrons in an element are excited energy is released that can be measured as light. Each element releases different levels of energy that are observed as different wavelengths of light. With the proper equations (E=hv and E=hc/⋋), emission spectroscopy can be used to find the wavelength and frequency of light emitted by the excited electrons. This will help determine the types of ions present in the water sample.
You later also have to calculate using the percent error formula and the difference formula. Not to mention, the lab also makes you determine whether the amount of "substance" in a substance affects the density or not. B. Hypothesis: I believe that the amount of substance does not affect the density of the substance because as the mass and volume of the substance grows, the density still stays the same. C. Materials: * 16 pieces of aluminum * 12 pieces of zinc * 20mL of water * 15mL of ethanol * 1 sheet of aluminum foil * Graduated cylinder * Beaker * Pipette * Small tray (to hold substances) * Ruler * Balance, scale, weights * Pencil * Paper Procedure: Part 1: 1. Measure the mass of a graduated cylinder.
The purpose of this lab was to find the molecular weight of two unknown substances by analyzing the freezing points in cyclohexane and to provide a visual representation of the freezing point depression effect. The theory of this lab is; by using measurements of mass of the unknown substances (solute) in correlation with the mass of the cyclohexane (solvent) and the freezing point constant of the solvent, you could determine the molecular weight of the solute by using the same math involved in deciding the freezing point of the solution/ The theory behind the visual of the FPD effect is that if one was to record the freezing point of a solution and two solutions of the same substances with more solute, one would see a visible drop in freezing point. The equations you needed for this lab were the freezing point formula for organic substances (ΔFp=(m)Kf) and the
Pre Lab Objective: The purpose of this lab is to obtain the mass and volume of two different metal samples, to graph data, to obtain the slope of graphed data and to display a best fit curve of experimental data in order to graphically determine the density of each metal Background: Understanding the relationship that exists between a substance’s mass and its volume. This relationship is expressed by the physical property called density. (D = M/V). In order to determine the volume of solids, a technique called water displacement is used. A fixed amount of water is added to a graduated cylinder and the volume of water is recorded.
Introduction: Density is a physical property of matter. Physical properties, unlike chemical properties, are properties that can be observed or measured without changing the composition of the substance. In qualitative terms density refers to a measure of the relative heaviness of a substance with a constant volume. Further, density is an intensive physical property, meaning that it does not depend on the amount of material in the system. For example, the density of a sample of gold will be the same whether it is a coin-size sample or a brick-size sample.
A balance can measure mass, which is best, defined as the amount of matter in a sample. In order to measure an objects volume, the student will have to use water displacement for irregular metals and various formulas to find the volume of three-dimensional objects. The density, which is the ratio of the mass over the volume, can be used to identify a metal or element. There are multiple reasons as to why the student will perform this lab. First off is to test the student’s knowledge on using measurement tools accurately when measuring the mass and volume of the metals in this specific lab.