Observations: Part I: Reaction between iron and oxygen Appearance of steel wool after 20 minutes From (relatively) shiny metal strips to not-so-shiny strips that are stained with dark‚ reddish-brown stuff. Part II: Decomposition of hydrogen peroxide Appearance of potato and hydrogen peroxide combination: Lots of white‚ foamy bubbles around the potato slices. Day 2 Observations: Part III: Reaction between zinc and acetic acid Appearance of penny in vinegar after
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CBSE TEST PAPER-03 CLASS - X (Chemical Reactions and equations) 1. Take about 5 ml of dil. HCl in a test tube and add a few pieces of fine granules to it. Which gas is evolved? (a) Chlorine (b) Hydrogen (c) HCl (d) Nitrogen 2. Dissolving suger is an example of(a) Physical change (b) Chemical change (c) Redox Reaction (d) None of these. 3. Heat is evolved diving (a) Endothermic Reaction (b) Displacement Reaction (c) Combustion Reaction (d) Combination Reaction 4. Which of the following is not a balanced
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complex reactions and reaction sequences‚ where raw materials react together to give the product. Such chemical process often releases energy‚ in the form of heat‚ and the reaction is described as exothermic. Many of these reactions may also evolve gases at high rates‚ and could cause reactor over-pressure. Thermal runaway reaction Runaway reactions are thermally unstable reactions where the heat of reaction can raise the temperature of the reactants sufficiently to accelerate the reaction rate out
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Elimination Reactions ________________________________________ As described previously‚ primary alkyl halides generally undergo substitution reactions with simple nucleophiles by an SN2 mechanism. Secondary alkyl halides‚ often react with simple basic nucleophiles to give a mixture of products arising from both substitution and elimination. As with substitution reactions‚ the rate at which elimination reactions proceed can be proportional to both the concentration of the base and the concentration
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My Reaction to Apollo 13 The movie Apollo13 is great but little kind of boring. Tom Hanks is a great artist! He is my idol. One of his great movie is Forrest Gump. By the way‚ The Apollo13 is America’s third moon landing mission. En route‚ an onboard explosion deprives their spacecraft of most of its oxygen supply and electric power‚ forcing NASA’s flight controllers to abort the Moon landing‚ and turning the mission into a struggle to get the three men home safely. I thought Jim’s wife was his
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Condoms should be distributed in schools because of the growing number of teenage pregnancy‚ to minimize the spread of sexually transmitted diseases among adolescent and it is a good investment for the government to help control students irresponsible sexual behavior. Everyday thousands of sexually active teenagers are putting themselves at risk of getting pregnant‚ and as such there is an alarming rate of teenage pregnancies in schools which can have a negative impact on most teenagers’ life. According
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Teen Pregnancies‚ STD’s‚ and Their Consequences Allison Dry COM/220 July 21‚ 2010 Camisha Williams Teen Pregnancies‚ STD’s‚ and Their Consequences Remember being a teenager and the cool thing to do was to smoke cigarettes? Or to act like you were with the candy sticks that had the red tips on them? Well now we all know that smoking is not the cool thing to do‚ but now there is something new that everyone thinks is the cool thing to do. Teen pregnancies are a big issue right now. 1/3 of
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How to Have a Healthy Pregnancy The best thing you can do is to begin taking care of your baby before it is born. * Make an appointment with your healthcare provider and begin prenatal care early. * Make sure you don’t drink alcohol or take drugs. If you smoke‚ quit right away. * Talk with your healthcare provider (HCP) about what medications are safe to take during your pregnancy. Be honest and tell your HCP if you have used or abused drugs in the past or present. Be sure to tell
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Adolescent pregnancy - Overview Alternative Names Teenage pregnancy; Pregnancy - teenage Definition of Adolescent pregnancy: Adolescent pregnancy is pregnancy in girls age 19 or younger. Causes‚ incidence‚ and risk factors: The rate of adolescent pregnancy and the birth rate for adolescents have generally declined since reaching an all-time high in 1990‚ mostly due to the increased use of condoms. Adolescent pregnancy is a complex issue with many reasons for concern. Younger adolescents (12
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ENGINEERING Reaction Engineering CGC035 / CGC052 Problem Sheet 3 - Fluid-fluid reactions 1. The reaction rate for the heterogeneous reaction A(g) + B(l)→ products is second order according to the expression -rA=kCACB and it is relatively slow compared to mass transfer so it takes place in the bulk of the liquid. Combine the following rate expressions for diffusion through the gas and liquid films‚ -rA=kAga(pA-pAi) and -rA=kAlaCAi-CA‚ with Henry’s law pAi=HACAi and the reaction rate
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