Ib Chemistry Lab Sl

All standardizations are performed in triplicate. Weigh out .1000-.1200 gram KIO3. Add 70-80 mL of deionized water. Swirl and dissolve. Add 3 mL of 6M HCl. Swirl and mix. Quickly titrated the brow-red solution with 0.1M Na2S2O3 until it is light yellow. Then add 3.5 mL of starch indicator. Titrate again until the dark color first disappears.

6-3: This process is used by cells to manufacture _biochemical energy from nutrients into adenosine triphosphate (ATP), and then release waste products__

The dependent variable in the experiment was the temperature and energy absorbed by the water.

The main objective of this experiment is to differentiate between a physical change and a chemical change.

I will be doing this experiment to understand density of water compared to the volume of an object. D=m/v=mass/volume

The purpose of this lab is to test substances and to determine the physical and chemical properties of substances.

The independent variable for the experiment was the paper towels. The dependent variable was the absorbency and strength. The constants for the experiment were the size of the paper towels that were used, the amount of water, the size of the beaker, the size of the cylinder and the amount of the weight.

Directions: Read/ Study all the lesson information in the 5.03 lesson then click the activity tab to perform two virtual labs. (There are recorded Teaching Videos for lesson 5.03. To view them click the “Help Sign” on the announcement page. Next scroll down to Lesson 5.03 stuff and you should see 5 part video links that will cover the lesson content.)

pH was recorded every time 1.00 mL of NaOH was added to beaker. When the amount of NaOH added to the beaker was about 5.00 mL away from the expected end point, NaOH was added very slowly. Approximately 0.20 mL of NaOH was added until the pH made a jump. The pH was recorded until it reached ~12. This was repeated two more times. The pKa of each trial are determined using the graphs made on excel.

The data gathered and calculated in the experiment accurately portrayed the way the reactions would have taken place. The chloride analysis was a little bit off from other groups due to the fact that our AgCl was in clumps, creating less surface area, thus our product took longer to burn and may not have burned correctly compared to other groups; yet there are several experimental factors that could have caused us to have different results than other groups, i.e. different measurements for samples. Our sources of error could have included eye measurement error, timing of set solutions error, measurement errors, and small calculation errors. Among other variables, the calibration of the analytical balance and spectrophotometer could have

Examine a piece of nichrome wire. On the data sheet, record the color and the luster of the metal. Use a forceps to hold the wire in the flame of your burner for about two minutes (recall where the hottest part of the flame is located). Describe the appearance of the wire while held in the hottest part of the flame. Allow the wire to cool and reexamine it. From your observations, determine if there was a physical or a chemical change. Give specific reasons for your conclusions. Save the nichrome wire for step #2.

•Constants: Amount of time in liquid, the container, and amount of liquid, same environment, same type of Jelly Marble

Thermochemistry is the study of heat or energy from chemical reactions. Heat energy may be absorbed or released meaning the reaction is either endothermic or exothermic. Thermochemical reactions look at the heat in regards to the surroundings of the reaction to determine what type of reaction it is. The changes in heat are calculated by a calorimeter. Calorimeters calculate the change in heat by measuring the change in temperature and using the formula Q = mc ΔT, where Q is the heat of energy transferred, m is the mass of the calorimeter, c the specific heat of the calorimeter and ΔT being the change in temperature.

Fundamental of Science (Assignment 1) Measuring Quantities for Chemical Reactions P1 1. The atom is mainly made up of two specific regions : the positively charged nucleus made up of protons and neutrons, and the shells (orbitals) in which electrons are present, were they orbit around the positively charged nucleus to create a neutral atom. The Atoms are thus made up of three subatomic particles: The proton, neutrons and electrons. The protons are positively charged while the electrons are negatively charged, and the neutrons are neutral.

To determine of changing the viscosity will affect the time it takes for a marble to flow through a liquid.