Fundamentals for Chemistry-Quantitative Measurements

Discuss what you did in this lab and what you will cover in the lab

Determine the volume of the magnet and metal bolt to +/- 0.1 mL using units and sig figs carefully. Measure the mass and calculate the density of the magnet and metal bolt using the correct significant figures and units. Show work for full credit. (2 points)

Please answer these questions then place them in the drop box for this lab. Use Microsoft word if possible.

Purpose: To become familiar with the International System of Units and common laboratory equipment and techniques. To learn how to determine volume, mass, length, and temperature of a wide variety of items. To learn how to calculate density and concentration of dilutions.

The purpose of this particular lab was to experiment and identify the chemical and physical changes throughout the experiment.

Procedure: Using distilled water, premeasured containers and objects determine displacement of fluids and density of objects. Use ice and heat measure temperatures in Celsius, Fahrenheit and Kelvin.

First, I will get my materials and set up the scale and 10 mL cylinder and refraction cell. I will check the size of the graduated cylinder to find out the volume. (LxHxW) That will equal 40.5mL for volume. I will see how much the cell weighs alone, and then I will 0 out the scale to see how much the water weighs. Then I will see how much the water and the cell weigh together. I will do this for the cell and cylinder. I will check to see if the density I calculated is what it is supposed to be at 1.00.

10 °C (50 °F) 0.006 0.006 0.007 0.006 20 °C (68 °F) 0.251 0.285 0.273 0.27 30 °C (86 °F) 0.767 0.789 0.799 0.785 Optical Density 40 °C 50 °C (104 °F) (122 °F) 0.969 0.93 0.947 0.922 0.945 0.947 0.954 0.933 60 °C (140 °F) 0.843 0.827 0.829 0.833 70 °C (158 °F) 0.641 0.623 0.632 0.632

Answer the lab questions for this week and summarize the lab experience using this form.

Answer the lab questions for this week and summarize the lab experience using this form.

This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is simply a summary of the experiment’s questions, diagrams if needed, and data tables that should be addressed in a formal lab report. The intent is to facilitate students’ writing of lab reports by providing this information in an editable file which can be sent to an instructor.

Using the yellow tube, which included everything but starch, as the blank, each group zeroed their spectrophotometer. This was done so that any absorbance observed depends only on the amount of starch present, not on any other reagents (buffer, IKI). To zero the spectrophotometer, the wavelength was first set at 580nm, using knob 3 (45). Next, the groups made sure that the light next to “transmittance” was lit, and the chamber to be tightly closed. Having the chamber empty & closed tightly provides reference for the darkest condition possible. Using knob 1, the transmittance was turned until it read 0.0 (45). Before the groups used their blank test tube to zero the spectrophotometer, each needed to wipe the tube with kimwipes to ensure a clean reading. Turning knob 2, each group was then instructed to zero the absorbance, 0.000. Upon removing the blank, each trial was inserted into the chamber (46). The

The Lab One was done on Laboratory Techniques and Measurements. The first experiment with my Lab partner; we got opportunity to experiment how to conduct measurements in length by using metric conversion. We started in cm units and changed into mm by x10, and moving decimal point x1 to right. To find in meter we moved from cm to meter two decimal points to the left or double check our self divided by 100 and all records in data table 1. The second experiment was to measure temperature of how cold and hot tap water can be by using thermometer in Celsius units. From this experiment, gained knowledge that tab water doesn’t boil to 100 Celsius related to containing different

The purpose of this lab was for the student to get involved with his or hers new lab kit as well as being able to know, identify and use each other tools provided in the kit. Another key learning aspect of this lab is to teach the student how to measure properly the many units in the SI system. I will be using laboratory dilutions, measurements, and weights to then calculate using algebraic formula.

Describe what you did in the experiment, and include methods and materials used. Do not