added to 50.0 milliliters of 0.20 - molar HOCl to obtain a buffer solution that has a pH of 7.49? Assume that the addition of the solid NaOH results in a negligible change in volume. (2 points) (e) Household bleach is made by dissolving chlorine gas in water‚ as represented below. Cl2 (g) + H2O --> H+ + Cl- + HOCl (aq) Calculate the pH of such a solution if the concentration of HOCl in the solution is 0.065 molar. (1 point)
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Chemistry is a big part of your everyday life. You find chemistry in daily life in the foods you eat‚ the air you breathe‚ your soap‚ your emotions and literally every object you can see or touch. Here ’s a look at some everyday chemistry. Elements in the Human Body Steve Allen‚ Getty Images Your body is made up of chemical compounds‚ which are combinations of elements. While you probably know your body is mostly water‚ which is hydrogen and oxygen‚ can you name the other elements that make
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Key Questions 8.1 and 8.2: Writing and Balancing Chemical Equations Include phases of matter for ALL reactants and products. Circle the chemical formula of the precipitate‚ if any‚ in each reaction. Balance all chemical equations. 1. Write a chemical equation for the reaction that occurs when solid sodium oxide is added to water at room temperature to yield sodium hydroxide . (Check the Solubility Rules to determine the phase of matter of sodium hydroxide.)
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Acid Base And Salt Acid Acids:- The word ‘Acid’ came from Latin word ‘Acidus or Acere’ which means sour. Sour taste is the most common characteristic of acid. Acid turns blue litmus paper red. There are many substances which contain acid and hence taste sour‚ such as curd‚ tamarind‚ lemon‚ etc. Types of Acids:- Acids are divided into two types on the basis of their occurrence – Natural acids and Mineral acids. Natural Acid:- Acids which are obtained from natural sources are called natural
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ONE-SCHOOL.NET Short Notes: Form 5 Chemistry Rate or Reaction Calculation Rate of Reaction (Average Rate) Rates of reaction = Quantity change of reactants/products Total time for the reaction If the quantity change is immeasurable Rates of reaction = 1 Total time for the reaction Find the Rate From a Graph Average Rate Rates At an Instant The rate of reaction is equal to the slope of the graph The rate of reaction at an instant‚ t‚ is equal to the of quantity against
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1) What is the purpose of ice or cold water? To cool down the gas so that it condenses and turns into a liquid. 2) when the gas collecting tube is upside down‚ give a property of this gas. It is less dense than air. 3) Why is a pencil used in drawing the origin line in chromatography? If pen was used‚ it will dissolve giving colours and so‚ the experiment won’t be accurate. Pencil doesn’t interfere with the results. 4) When using ethanol‚ give a better apparatus arrangement‚ and why? Cover
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of ozone in the stratosphere due to its faster destruction by chemicals released by man into the environment. Depletion is mainly caused by chlorofluoro carbons (CFCs)‚ halons‚ methyl chloroform and carbon tetrachloride. There substances contain chlorine or‚ bromine which‚ can reach the stratosphere. These elements are capable of catalytically breaking down ozone into oxygen. Ozone depletion can also be caused by supersonic jet exhausts. They liberate NO which reacts with 03 to form N02 and 02
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final change in temperature for ammonium chloride was 4.74 °C‚ and the final change in temperature for urea was 2.09 °C. To cause these results‚ ammonium chloride‚ which is a salt of a weak base‚ more than likely dissociated into ammonium ions and chlorine ions‚ resulting in twice as many more particles in solution than urea‚ which probably doesn’t dissociate much or at all‚ in the water/ice
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The Earth’s atmosphere has changed over billions of years‚ but for the past 200 million years it has been much as it is today. We are‚ however‚ causing our atmosphere to change by human activity. Burning fossil fuels and deforestation are two examples of human effect on the environment. Composition of the Earth’s atmosphere The composition of air You need to know the proportions of the main gases in the atmosphere. The Earth’s atmosphere has remained much the same for the past 200 million years
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reaction of magnesium with oxygen. The magnesium is cleaned before burning in air to remove this layer so that the metal can be exposed to air properly. Q.2. Write the balanced equation for the following chemical reactions: (i) Hydrogen + Chlorine → Hydrogen chloride Ans. H2 (g) + Cl2 (g) → 2HCl (g) (ii) Sodium + Water --> Sodium
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