In the next steps the density of water between 30-40 °C, 40-50 °C and 50-60 °C was measured. Then our results ρ vs T and also density vs temperature values given in the Steam Tables were plotted on the same graph in order to compare. In the second part the density of water was measured by density bottle. The densities obtained from the experiment are 995, 992.5, 991, 990 kg/m3 for the first part and
The topic that the scientist has researched is the reaction rate of different particle sizes. In the experiment, the scientist will discover how the particle size of Alka Seltzer affects the rate of chemical reaction with water. The independent variable in the experiment is the particle size of the Alka Seltzer, while the dependent variable is the rate of reaction, or the volume of Carbon dioxide. The volume of carbon dioxide will be measured in ml. Also, a few of the constants in the experiment will be the amount of water, and amount of tablets.
Paragraph 1 The objective of the experiment is to test; how will water temperature affect the rate of reaction of an alka-seltzer tablet? The dependent variable of the experiment is the dissolving time. When an alka-seltzer tablet starts to fizz it begins to dissolve, due to the citric acid and sodium bicarbonate the tablet contains (Clark, “Why does Alka-Seltzer fizz?). When the tablet is in solid form, the two ingredients are not yet mixed together, but by dropping the tablet in water, a chemical reaction is catalyzed between them, creating a fizzing sensation (Clark, “Why does Alka-Seltzer fizz?). When the sodium bicarbonate is placed in water, it begins to split apart and form bicarbonate and sodium ions (Science Buddies, Carbonation Countdown:
Specifically, this investigation analyses how the initial temperature effects the rate of Hydrogen Peroxide oxidising Potential Acid Sulfate Soil. Only when a rapid reaction took place, PASS has been oxidised using Redox theory with the presence of pyrite or other sulphides to react. The hypothesis that the rate of oxidation is correlates with the initial temperature of the solution is true, with the theory being supported that the higher temperatures result in increased reaction speed. This lab test was conducted over two different depths of PASS, with three trials of five temperatures for each of the two depths. The first and most obvious form of evidence lays within the averaged pH levels over time.
Sariah 's Science Portfolio Question - How does the amount of a substance affect the rate at which temperature changes? Hypothesis - It could be hypothesized that the more mass of water, there is, the longer it takes to heat up. Materials list - Water, graduated cylinder, 2 cups, thermometer. Safety procedures - Be careful when handling the hot cups; wear shoes that cover your toes; don 't wear dangling jewelry and don 't wear billowing shirts. Procedures - 1) Pour water into cups.
Introduction Alka-Seltzer has been on the market since 1931 and has helped to relieve indigestion and upset stomach. The tablets began to fizz and bubble when dropped into water. “The fizziness happens when baking soda (sodium bicarbonate) and citric acid react chemically in water. They yield sodium citrate, water and carbon dioxide gas, which causes bubbles.” Based on this information, we will measure the reaction time of AlKa- Seltzer dissolved in 200 ml of water at 3 different tempertures in the first portion of this experiment. In the second portion of this experiment we will keep the temperature constant and divide the ½ tablet of Alka- Seltzer into 2 pieces ,3 pieces and an unbroken ½ tablet.
- A hydrate is a salt that contains water as a part of its crystal structure. The hydrate used in this lab was Copper (ll) Sulfate Pentahydrate. To heat the hydrate in this lab a crucible is needed. A crucible is a heat resistant container used to heat things to high temperatures. In this lab a mole was used to determine the measurements of all substances.
The aim of this experiment was to create Butyl Ethanoate by the process of reflux esterification using 1-Butanol (, 16mL) and Ethanoic Acid (17.4M, 10mL) as raw materials. A catalyst sulphuric acid (18.0M, 2.0mL) was used to offer an alternate reaction pathway and forcing the equilibrium to shift to the right as it is a dehydrating agent result in a greater yield of ester. All reactants were heated under reflux for a total time of 45 minutes, boiling chips were added into the pear shaped flask to encourage even boiling and prevents the occurrence of superheating.
The dependent variable is the rate of decomposition of water which is measured by the volume of hydrogen gas and oxygen gas in cm3 The independent variable is the voltage here as I increase it from 9-14 Room temperature was 24 rtp and I carried out the whole experiment in the same room. If the temperature increases the rate of electrolysis will increase. The concentration of the sulphuric acid which is 0.02 M. If I increase the concentration of sulfuric it would’ve been the decomposition of sulfuric acid not water because we just need some ions in the pure water so the ions can move to the electrodes. An increase in concentration will increase the rate of decomposition. The socket that was the power supply was plugged in was 220-240 volts and same socket was used throughout the whole experiment Time is one of the major factors the time that was used is 35 minutes and if I increase the time the rate of decomposition is going to increase which means a greater volume of oxygen and hydrogen.