Chapters 11 12 Periodic Table Name __________________ ( ) Class __________ Date _________ History of the Periodic Table Russian chemist Dmitri Ivanovich Mendeleev 1834-1907 Arranged elements in order of increasing atomic masses Elements with similar chemical properties fall into the same vertical column Such an arrangement is the Periodic Table The Periodic Table The Periodic Table is a list of elements arranged in order of ______________ _____________ (__________) ____________. Groups
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equation. 14What are oxidation and reduction reaction? 15. Why do gold and platinum not corrode in moist air? Short Answers 1. Write balanced chemical equation for. a. Zinc metal reacts with aqueous solution of hydrochloric acid to form zinc chloride solution and hydrogen gas. b. Solid mercury (II) oxide is heated‚ liquid mercury and oxygen gas is produced. c. Aqueous solution of sulphuric acid and sodium hydroxide react to form aqueous sodium sulphate and water.
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the balanced chemical equation for the decomposition of water to its elements. 2H2O(l) 2H2(g) + O2(g) 2. (a) Assign oxidation states to the hydrogen and oxygen atoms in each substance in the above chemical equation. The oxidation state of H2(g) and O2(g) is zero‚ because they are in their normal state. (b) Based on the changes in oxidation states for each atom‚ identify the atom that is oxidized and the atom that is reduced in the decomposition of water. Hydrogen atom is reduced
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are the advantages of using bleach as a disinfectant? The disadvantages? The advantages of using 70% alcohol? The disadvantages? The advantages of using bleach as a disinfectant is strong and effective disinfectant. Its active ingredient‚ sodium hypochlorite‚ denatures protein in micro-organisms and is therefore effective in killing bacteria‚ fungus‚ and viruses. Household bleach works quickly and is widely available at a low cost. The disadvantage is could irritates mucous membranes‚ the skin‚
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produces corresponding calcium salts with liberation of CO2: CaCO3 + 2HNO3 Ca(NO3)2 + H2O + CO2(g) In this experiment‚ the mineral acid is added in excess to the calcium carbonate and the excess titrated against standard sodium hydroxide. This kind of titration is termed back titration. In this procedure‚ the analyte is consumed using excess titrant and the end
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Chlor-alkali is an industrial process widely used to produce chlorine‚ caustic soda‚ and other chlorine and sodium derived/based products such as sodium hypochlorite‚ hydrochloric acid‚ chlorosulphonic acid‚ bleaching power‚ polyaluminium chloride‚ hydrogen gas‚ and chlorinated paraffin. The process uses brine (sodium chloride) solution during electrolysis to produce aforesaid products which are also known as Chlor-Alkali Industry /market products. The report estimates the market size of Chlor-Alkali
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example‚ the sodium cation is indicated as Na+ and not Na1+. An alternative (and acceptable) way of showing a molecule/atom with multiple charges is by drawing out the signs multiple times; this is often seen with transition metals. Chemists sometimes circle the sign; this is merely ornamental and does not alter the chemical meaning. All three representations of Fe2+ shown in the figure are‚ thus‚ equivalent. Mixed Roman numerals and charge notatios for the uranyl ion. The oxidation state of the
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AP Chemistry Final Exam Review ESSAY. Write your answer in the space provided or on a separate sheet of paper. 1) Explain the difference between a qualitative and a quantitative measurement. Provide examples to illustrate this difference. Answer: A qualitative measurement is a measurement that gives descriptive‚ nonnumeric results; a quantitative measurement is a measurement that gives definite‚ usually numeric results. "The rock is heavy" would be a qualitative measurement. "The rock weighs 110
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Learning Goal: To understand how the scientific method can be used to search for explanations of nature. The scientific method is a procedure used to search for explanations of nature. The scientific method consists of making observations‚ formulating hypotheses‚ designing and carrying out experiments‚ and repeating this cycle. Observations can be either quantitative or qualitative. Quantitative observations are measurements consisting of both numbers and units‚ such as the observation that ice melts
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for food? And how is the use of food preservatives affects this all? What is Food Preservatives? Preservation usually involves preventing the growth of bacteria‚ fungi and other micro-organisms‚ as well as retarding the oxidation of fats which cause rancidity. Food preservation can also include processes which inhibit visual deterioration‚ such as the enzymatic browning reaction in apples after they are cut‚ which can occur during food preparation. Many processes designed
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