Erin Bolton Chemistry Lab Report April 29‚ 2015 Lab: Reaction Rates Introduction: In this experiment we studied the reaction of potassium persulfate‚ K2S2O8‚ with potassium iodide‚ KI. All chemical reactions have an energy barrier to overcome before the reaction will proceed. We will record data based on the concentration‚ temperature and catalyst for each experiment. Once this has been completed it will be graphed. Procedure: Due to the chemicals being used having hazard gloves are used
Premium Chemistry Chemical reaction
AP Chem Exam - ‘98 1. Solve the following problem related to the solubility equilibria of some metal hydroxides in aqueous solution. (a) The solubility of Cu(OH)2(s) is 1.72 x10–6 g/100. mL of solution at 25° C. (i) Write the balanced chemical equation for the dissociation of Cu(OH)2(s) in aqueous solution. Cu(OH)2 Cu 2+ + 2 OH – (ii) Calculate the solubility (in mol/L) of Cu(OH)2 at 25 °C. (1.72 x10–6 g/0.100 L)(1 mol/97.5 g) = 1.76 x10–7 mol/L (iii) Calculate
Premium Chemical reaction Chemistry Acid
Exothermic Reactions Brr! Exclaimed a kid who touched citric acid and baking soda combined. When those two mix‚ it creates a cold endothermic reaction. An exothermic reaction is a reaction that releases energy in the form of an increase in temperature. Endothermic reactions are reactions that absorb energy and cools down surroundings. (Many examples give away exo and endothermic reactions). So listen up! To begin with‚ a chemical reaction in which energy is released is an exothermic reaction. Heat
Premium Chemical reaction Thermodynamics
There are eight types of chemical reactions. These eight reactions are Decomposition‚ Composition‚ Acid/Base‚ Synthesis‚ Single-Replacement‚ Double-Replacement‚ Precipitation‚ and Redox. Though these eight could be referred to as the same due to them being chemical reactions. They are actually very different. An example of this difference is Decomposition and Synthesis. Decomposition is when a compound is broken into smaller chemical species while a Synthesis reaction is two or more chemical species
Premium Oxygen Chemistry Hydrogen
Comfort women were women and girls forced into a prostitution corps created by the Empire of Japan.[1] The name "comfort women" is a translation of a Japanese name ianfu (慰安婦).[2][3] Ianfu is a euphemism for shōfu (娼婦) whose meaning is "prostitute(s)".[4] The earliest reporting on the issue in South Korea stated it was not a voluntary force‚[5] and since 1989 a number of women have come forward testifying they were kidnapped by Imperial Japanese soldiers. Historians such as Lee Yeong-Hun[6] and
Premium Comfort women Japanese war crimes Empire of Japan
photoautotrophic nutrition. Carbon dioxide is an energy poor compound which is reduced during photosynthesis There are two main stages: 1. The light dependent reactions that occur on the granal membranes. Pigments are required to absorb and transduce the light energy. Membrane proteins act as electron carriers. 2. The light independent reactions that occur in the stroma of the chloroplast. Chlorophyll and other pigments are grouped together to form a photosystem. There are two photosystems‚ photosystem
Free Photosynthesis
English 100-05 5 October 2012 Reactions towards the Homeless In the article “Charity Means You Don’t Pick and Choose‚” Patricia O’Hara talks about many encounters with homeless people. She gives examples of people reacting with kindness‚ indifference‚ and contempt. At the end‚ she determines that people should consistently be kind regardless of circumstances. O’Hara frequently talks about the problem of how people who are doing well in life shouldn’t treat the homeless any different. People
Premium Poverty Homelessness
Action – Reaction B: All right‚ I’ll say: how are you all this day of your time‚ as you know time to exist? AUD: Good. Great. Perfect. B: We will begin with questions. Q: I have a question. We have had a physicist in history -- I believe it was Sir Isaac Newton -- he said for each action there is an equal and opposite reaction. Is that true in your culture? B: All right‚ understand‚ first of all‚ there will be many ideas and interpretations along that line‚ as you understand
Premium Physics Classical mechanics Universe
This lab focused on three factors affecting reaction rates‚ temperature‚ surface area‚ and concentration. Our first experiment (table 1) looked mainly into the effects of temperature on the reaction rate. To see how different temperatures would change the reaction rates we had three flasks all containing varying temperatures of water(H20). One with cold water (4°C)‚ one room temperature (21°C)‚ and one with hot water (44°C). In each flask‚ we dropped one tablet of Alka-Seltzer‚ all within 0.008 grams
Premium Chemistry Chemical reaction Temperature
In the lab testing the heat of a reaction to understand changes in enthalpy in an exothermic reaction‚ the group hypothesized that if the amount of reactant is changed then the amount of heat produced (exothermic) will increase. This hypothesis was supported through the data as each of the six trials produced heat and the larger the piece of magnesium the larger the change in heat was. In the first trial the group had .085 grams of Mg and after being placed in 3 ml of 21.8℃ HCl the temperature of
Premium Thermodynamics Chemical reaction Energy