HomeClass Notes1,200,000US530,000

CHEM 1111 Lecture Notes - Lecture 1: Graduated Cylinder, Volumetric Flask, Stopcock

33 views2 pages

plumbutterfly939

7 Oct 2015

School

Department

Course

Professor

Chia- Kuang Tsung

For unlimited access to Class Notes, a Class+ subscription is required.

Document Summary

Experiment 1: how dense is an egg: objective. Density is the characteristic property of a matter that can be used to identify a substance, and it refers to the amount of matter contained in a given space or volume. The objective of this experiment is to measure the density of the eggs to determine their freshness. We will prepare a salt solution and adjust the concentration of the solution so that a fresh egg or an old egg would just float . Making the eggs to just float is to make the eggs just touch the top of the solution, without any part of the eggs protruding above the solution. We will obtain mass and volume measurements and use them to calculate the density of the salt solution and the densities of the eggs. Prepare one 125ml and two 250ml erlenmeyer flasks and rinse them with acetone.

Related textbook solutions

Chemistry: Structure and Properties

ISBN: 9780134293936

Basic Chemistry

ISBN: 9780134138046

Principles of Chemistry Molecular Approach

ISBN: 9780134112831

Chemistry: Structure and Properties

ISBN: 9780134293936

Principles of Chemistry Molecular Approach

3rd Edition, 2014

ISBN: 9780321971944

Chemistry: A Molecular Approach

ISBN: 9780321809247

Chemistry: A Molecular Approach

ISBN: 9780134874371

Principles of Chemistry: A Molecular Approach

ISBN: 9780134895741

Chemistry: The Central Science

14th Edition, 2017

ISBN: 9780134414232

Related Documents

CHEM 1111 Lecture Notes - Lecture 1: Volumetric Flask, Spatula, Graduated Cylinder

GMS 401 Study Guide - Orange Roughy, Egg Tart

CHEM 1103 Lecture Notes - Lecture 1: Volumetric Flask, Graduated Cylinder, Spatula

goldguinea-pig40

Related Questions

he shell of an egg from a chicken is mostly made of calciumcarbonate, lined with a semipermeable membrane. The shell of theegg can be dissolved using acetic acid (vinegar). The gas-evolvingreaction is as follows:

CaCO3(s)+2CH3COOH(aq) ---->Ca(CH3COO)2(aq)+H2O(l)+CO2(g)

Suppose you start with two fresh eggs, with the shell alreadydissolved. You place one egg in a solution of corn syrup (75% byweight sucrose [C12H22O11]; 25% water; density of 1.38g/mL) and theother in table salt solution (0.70 M NaCl). In both cases the eggshrivels, but which one will have the greater volume? Assume theeggs are the same size to start, that all solutions behaveidentically, and you must provide your answer mathematically andexplain. (Note: Assume 25 degrees C).

Need help answering the pre - lab questions

Chemistry 1010 Laboratory Fall 2016 Lab: Percent Sugar Content of Beverages ave you ever been to the ocean? Does it seem that you can float or swim much easier in the ocean than in a swimming pool? Seawater is more dense than freshwater due to the presence of dissolved salt in the cean As a result, our buoyancy-ability to float-is greater in salt water than in plain water. What factors of a particular substance is dissolved in it? Background The density of a pure substance is a characteristic physical property that can be used to identify the substance does not depend on the amount of the substance. The density of any material is determined by measuring its mass and volume and then dividing the mass by the volume. The mass of a substance can be measured directly using a balance. The volume of a liquid can be measured directly using special laboratory glassware, such as a graduated cylinder, buret, or pipet. In this experiment, liquild volumes will be measured using a graduated cylinder Density is defined as the ratio of mass per unit volume. It is an "intensive" property, that is, it The density of a solution depends on its concentration, that is, how much solid is dissolved in the liquid. The higher the concentration of solid, the greater the density of the solution. A convenient way to express concentration is in units of weight percent, which corresponds to the number of grams of sollid that are present in 100 g of solution. A 20% salt solution is prepared by dissolving 20 g of sodium chloride (table salt) in 80 g of water to give a final mass of 100 g of solution. When the density of a solution is plotted on a graph against the concentration of the solution, a regular pattern becomes evident, specifically that density is directly proportional to the concentration of solid in the solution. A 20% salt solution, for example, has a higher density and higher concentration of solid than a 10% salt solution. If the densities of several solutions of known concentration are determined experimentally and plotted on a graph, a calibration curve can be drawn to show a straight-line relationship between the density of a solution and the concentration of solid (note: the calibration curve in this lab reveals a linear (straight-line) relationship, but not all calibration curves are linear). The calibration curve can then be used to find the concentration of solid in an unknown solution simply based on experimentally measuring the density of the solution. Experiment Overview The purpose of this experiment is to determine the percent sugar content in beverages. The density of five reference" solutions will be determined in Part A. The reference solutions contain known amounts sugar " of sugar (0-20%). Their densities will be plotted on a graph to obtain a calibration curve of density versus nt sugar concentration. In Part 8, the densities of two beverages will also be determined, and the The results will be compared against the information provided on the nutrition labels for these beverages 1. if the following mass and volume data are used to calculate the density of solution, how many cal libration curve, created from the data in Part A, will be used to find the percentage of sugar they contain. Pre-Lab Questions significant figures are allowed in the calculated density? Mass of solution 12.53 g: volume of solution = 8.27 mL Calculate the density of the solution described in Question #1 (Hint: This is a 2-step problem. Then calculate the percent sugar in the beverage.) According to its nutrition label, orange soda 2. 3. First, use the density to convert the 355-mL serving size to grams. Lab: Percent Sugar Content of Beverages

please I need help with these Lab questions.

Show transcribed image text