41. 6th Grade Science Quizzes - Acids And Bases 6th grade science Curriculumbased quizzes for Elementary School (grade6) students Periodic Table. acids and bases. acids and bases http://www.1001-periodic-table-quiz-questions.com/grade_6_science_quizzes.html

6th Grade Science Quizzes 6th grade science - acids and bases; protons, neutrons and electrons Planet Mars Planet Mars Grade 1 to 3 Grade 4 Grade 5 Grade 7 ... Home Remember to add this website to your favorites if you find it useful :-) Free Science Quizzes (age 11) Acids and Bases - Quiz 1 - pH, Boyle, litmus changes Acids and Bases - Quiz 2 - pH, litmus color changes Acids and Bases - Quiz 3 - Conjugate bases, alkalies Acids and Bases - Quiz 4 - Hydronium ion, diprotic Nuclear Reactions - Quiz 1 - Nuclear Reactions - General Nuclear Reactions - Quiz 2 - Nuclear Reactions - Alpha particles, beta particles and gamma rays. Protons, neutrons and Electrons - Quiz 1 - Electron clouds and charges Protons, neutrons and Electrons - Quiz 2 - Nucleons, size of the nucleus Protons, neutrons and Electrons - Quiz 3 - Charges of protons and electrons Properties of Metals - Quiz 1 - Malleability, ductility, alloys, conductors of electricity and heat Complete list of all the free Science quizzes Grade 6 Science Curriculum Periodic Table Use the periodic table to identify the most common elements in their groups.

42. Chapter 12 - Acids And Bases Chapter 12 acids and bases. I. Properties of acids and bases acids. Tastesour; Reach with certain metals (Zn, Fe, etc.) to produce hydrogen gas; http://virtual.yosemite.cc.ca.us/lmaki/Chem142/chap_outlines/chapter12.htm

Chapter 12 - Acids and Bases I. Properties of Acids and Bases ACIDS Taste sour Reach with certain metals (Zn, Fe, etc.) to produce hydrogen gas cause certain organic dyes to change color react with limestone (CaCO3) to produce carbon dioxide React with bases to form salts and water BASES Taste bitter feel slippery or soapy react with oils and grease cause certain organic dyes to change color react with acids to form salts and water Define: Acid - a substance that produces protons, H Base - a substance that produces hydroxide ions, OH II. Reaction of acids and bases with water: Acids and bases form ions in solution: HCl(aq) H (aq) + Cl (aq) H O hydronium ion H and H O are equivalent in aq. solution When we look at the reactions of acids - can be generalized using hydrogen ion Reaction with zinc yields hydrogen gas Reaction with limestone - produce CO2(g) Acids react with bases to produce a salt Similarly for bases, produce hydroxide ions III. Neutralization and Salts

43. Organic Acids And Bases Menu Understanding Chemistry. ORGANIC acids AND bases MENU. Organic acids . . .Explains why organic acids are acidic, and what affects their strengths. http://www.chemguide.co.uk/basicorg/acidmenu.html

Understanding Chemistry ORGANIC ACIDS AND BASES MENU Organic acids . . . Explains why organic acids are acidic, and what affects their strengths. Organic bases . . . Explains why primary amines are basic, and what affects their strengths. Go to menu of basic organic chemistry. . . Go to Main Menu . . .

44. Theories Of Acids And Bases Describes the Arrhenius, BronstedLowry, and Lewis theories of acids and bases,and explains the relationships between them. THEORIES OF acids AND bases. http://www.chemguide.co.uk/physical/acidbaseeqia/theories.html

THEORIES OF ACIDS AND BASES This page describes the Arrhenius, Bronsted-Lowry, and Lewis theories of acids and bases, and explains the relationships between them. It also explains the concept of a conjugate pair - an acid and its conjugate base, or a base and its conjugate acid. Note: Current UK A' level syllabuses concentrate on the Bronsted-Lowry theory, but you should also be aware of Lewis acids and bases. The Arrhenius theory is of historical interest only, and you are unlikely to need it unless you are doing some work on the development of ideas in chemistry. The Arrhenius Theory of acids and bases The theory Acids are substances which produce hydrogen ions in solution. Bases are substances which produce hydroxide ions in solution. Neutralisation happens because hydrogen ions and hydroxide ions react to produce water. Limitations of the theory Hydrochloric acid is neutralised by both sodium hydroxide solution and ammonia solution. In both cases, you get a colourless solution which you can crystallise to get a white salt - either sodium chloride or ammonium chloride. These are clearly very similar reactions. The full equations are:

45. Riverdeep | Chemistry Gateways | Understanding Chemical Equilibrium | Properties In this activity, students are introduced to the properties of acids and bases,and how these properties are measured. Activity, Properties of acids and bases, http://www.riverdeep.net/science/chemistry_gateways/cg_activity_pages/catn.activ

Elementary (K-6) Middle School (6-9) High School (9-12) Middle School Science Gateways ... edConnect To find support materials for a different Chemistry Gateways activity, including lesson plans and student handouts, you will need to select a unit from the tabs below and then select from the activities listed underneath. Product Chemistry Gateways Unit Understanding Chemical Equilibrium Activity Properties of Acids and Bases Overview In this activity, students are introduced to the properties of acids and bases, and how these properties are measured. Privacy Policy Terms and Conditions Math Science ... Contact Us

46. Riverdeep | Chemistry Gateways | Chemical Nomenclature | Binary Molecular Compou listed underneath. Product, Chemistry Gateways, Unit, Chemistry Toolbox.Activity, Chemical Nomenclature acids and bases, Overview, In http://www.riverdeep.net/science/chemistry_gateways/cg_activity_pages/catn.activ

Elementary (K-6) Middle School (6-9) High School (9-12) Middle School Science Gateways ... edConnect To find support materials for a different Chemistry Gateways activity, including lesson plans and student handouts, you will need to select a unit from the tabs below and then select from the activities listed underneath. Product Chemistry Gateways Unit Chemistry Toolbox Activity Chemical Nomenclature: Acids and Bases Overview In this activity, students learn how atoms lose or gain valence electrons to become stable cations or anions, and they practice naming and writing formulas of common cations and anions. Privacy Policy Terms and Conditions Math Science ... Contact Us

47. Acids And Bases Graduate Credit Workshop acids and bases How acids and bases are Made Manycommon fluids are acids or bases, yet they do not harm us. http://www.engineering.usu.edu/jrestate/workshop/acid.htm

Graduate Credit Workshop Acids and Bases HOME CLASS ACTIVITY How Acids and Bases are Made Water will naturally "break up" into H and OH in a process known as dissociation When water dissociates the hydrogen atom breaks its bond with oxygen and leaves behind its electron. The hydrogen atom is now positively charged and properly called a hydrogen ion . The remaining hydrogen is still connected to the oxygen, which now has an extra electron, giving this pair a negative charge. The OH molecule is properly called a hydroxide ion . The amount of dissociated water molecules in relation to all the water molecules is very small, and since the overall amounts of H and OH are equal, they cancel each other out. If, for some reason, the H and OH are not balanced, an acid or base is formed. The acidity or alkalinity (baseness) of the solution is rated on the pH scale. The range of this scale is from to 14 with 7 being the neutral point. Numbers below seven are acidic, while numbers above seven are basic. It is important to note that this scale is logarithmic. Thus, a pH of 2 is not twice as acidic as a 4, but rather 100 times as acidic. That same pH of 2 is not three times as acidic as a pH of 6, but rather 10,000 times as acidic. Acids are aqueous solutions that have more H than OH . This can be caused by adding H ions or by taking away OH ions (actually, the process is far more complicated than this, but for what you will need to do this definition will work fine). Acids are characterized by their sour taste and their ability to dissolve metals. Many of the foods you eat, such as oranges, green apples, and rhubarb, taste sour due to the acids which they form. Many cleaners have acids in them. It is important that you read the warning labels on your household cleaners as we do not advise that you use acidic solutions to clean water pipes in your home.

48. Acids & Bases acids and bases. JC Baird's Own Notes. Under Construction. Go Here to Down LoadAdobe Acrobat Reader 2.0. acids bases via Adobe Acrobat. return to Lecture Notes. http://jcbmac.chem.brown.edu/baird/Chem22I/lectures/Acids&Bases/acids&bases.html

Acids and Bases J. C. Baird's Own Notes Under Construction Go Here to Down Load Adobe Acrobat Reader 2.0 return to Lecture Notes

49. Strength Of Common Acids And Bases Strength of common acids and bases. Several common acids and basesare supplied as concentrated solutions in water. The table below http://ptcl.chem.ox.ac.uk/MSDS/acidsbases.html

Strength of common acids and bases Several common acids and bases are supplied as concentrated solutions in water. The table below gives approximate molarities for these materials. Chemical Formula Molecular weight Molarity Specific gravity Weight % Acetic acid (Ethanoic acid) CH COOH Ammonium Hydroxide ("880 Ammonia") NH OH Formic acid HCOOH Hydriodic acid HI Hydrobromic acid HBr Hydrochloric acid HCl Hydrofluoric acid HF Nitric acid HNO Phosphoric acid H PO Sulfuric acid H SO Return to the Safety Home Page of the Physical and Theoretical Chemistry Laboratory at Oxford University. Last updated October 11, 2002.

50. Montshire Museum: Acids And Bases Montshire Minute acids and bases Not interested? Well, in the past scientistshave used taste as one way to distinguish acids from bases. http://www.montshire.net/minute/mm990823.html

Montshire Minute: Acids and Bases Originally aired during the week of August 23, 1999 Monday O.K. Mr. Science person, today we're going to test liquids for acididity. Your first job is to stick this juicy slice of lemon in your mouth. Then, wash your mouth out with soap. Not interested? Well, in the past scientists have used taste as one way to distinguish acids from bases. The English chemist Robert Boyle established the following "taste criteria" for acids and bases: Acids taste sour and bases or "alkalies" (like those found in soap) feel slippery on the tongue. The name "acid" comes from the Latin word acidus meaning "sour." Citric acid is what makes lemons tart and sour. Alkalies in soap are more commonly known as bases because they are the "base" for making certain salts. There's some pretty interesting chemistry involved with acids and bases, too. Acids and bases can neutralize each other: when combined, acids lose their acidity and bases become less "alkaline" or basic. Tuesday Some neutralization reactions are just delicious. Don't believe me? As Tina Seelig writes in The Epicurean Laboratory, cooks are really doing acid-base chemistry when they bake. Let's say you're whipping up a batch of pancakes for breakfast. When you mix an acidic ingredient like buttermilk with a basic ingredient like baking soda, a neutralization occurs, producing carbon dioxide, gas, and water. The carbon dioxide bubbles expand when the batter is poured on a hot griddle, making the batter rise. Leavening agents like baking soda get most of the credit for making pancakes rise, but you actually need an acidic ingredient like buttermilk, yogurt, or even honey to make the carbon dioxide bubbles. In recipes that lack acidic ingredients, baking powder is used rather than baking soda. Baking powder is baking soda with a acid-like cream of tartar-already built in.

51. Properties Of Acids And Bases Properties of acids and bases. Observable Properties. (You may rememberdoing this in lesson 1 of CH104.). Identifying acids and bases. http://dl.clackamas.cc.or.us/ch105-05/properti.htm

Properties of Acids and Bases Observable Properties One purpose of this lesson is for you to become familiar with many aspects of acids and bases. Let's start with some of the observable properties of acids and bases. Take a look at exercise 2 in your workbook. In this exercise you will test the reaction of an acid and a base with the various chemicals listed here. For the acid use 1 molar hydrochloric acid (1M HCl). For the base use 1 molar sodium hydroxide (1M NaOH). The video clip to the right shows the reaction of an acid with blue litmus paper (left) and then with pH paper (right). To start the video clip move your mouse over the image. (You do not need to click.) The video clip to the right shows the reaction of a base with red litmus paper (left), then with phenolphthalien (center), and then with pH paper (right). To start the video clip move your mouse over the image. (You do not need to click.) When you are in the lab you will perform these tests and the others in the exercise, then record the results in the blank spaces on the chart. When you have completed exercise 2, you will have experimented with several properties of acids and bases. Those properties give you a variety of ways that can be used to test whether a material is an acid or a base (which comes up in exercise 4). Let me take a minute to touch on a few of them.

52. Definitions Of Acids And Bases Definitions of acids and bases. Arrhenius acids and bases. Long beforethere were Bronstead/Lowry acids and bases. In 1923, the Danish http://www.chem.uidaho.edu/~honors/acidbase.html

Definitions of Acids and Bases Arrhenius Acids and Bases Long before there were chemists, people were aware of groups of compounds that later were called acids and bases. Acids were sour to the taste (probably first observed as the taste of wine that has oxidized to give vinegar), dissolved rocks such as limestone and marble, and dissolved metals. Gold was special in that it did not dissolve in common acids. In fact, it required a mixture of hydrochloric acid and nitric acid that was called aqua regia or royal water to dissolve. Bases were also known as compounds that were bitter to the taste, slimy to the touch and neutralized acids. One of Antoine Lavoisier's early contributions was to clarify the identity of several acids. In 1880, Svante Arrhenius, 1859 - 1927, recognized that the acids and bases which he knew could be classified by a simple idea. Acids were those compounds that dissolved in water to increase the H O concentration and bases were compounds that increased the HO concentration. By the way, I have a suspicion that this is not exactly what Arrhenius stated at that time as the ionic nature of these materials was not yet fully understood, but his ideas then were the precursors to the more modern terminology. It's easy to see that almost all of the common acids and bases could be accommodated by this definition.

53. Acids And Bases Table of Contents http://www.okstate.edu/jgelder/acidandbase.html

Table of Contents

54. Chemistry: Acids And Bases pH + pOH = 14.00. Definitions of acids and bases. The pH of the salt dependson the strengths of the original acids and bases Acid, Base, Salt pH. http://www.shodor.org/unchem/basic/ab/

HOME Course Chapters Calculator Fundamentals Mathematics Review Basic Concepts Chemical Nomenclature (REQUIRED FOR CREDIT!) Atomic Structure Stoichiometry Acid Base Chemistry Advanced Concepts Section Tests Pre-test Post-test Useful Materials Glossary Online Calculators Redox Calculator Kinetics Arrhenius Calculator Thermodynamics Calculator Nuclear Decay Calculator ... Nomenclature Calculator Related Information Links Texas Instruments Calculators Casio Calculators Sharp Calculators Hewlett Packard Calculators ... Contact Webmaster Acid-Base Chemistry Water pH Definitions of acids and bases Salts ... Acid-Base Titrations Water We typically talk about acid-base reactions in aqueous-phase environments that is, in the presence of water. The most fundamental acid-base reaction is the dissociation of water: In this reaction, water breaks apart to form a hydrogen ion (H ) and a hydroxyl ion (OH ). In pure water, we can define a special equilibrium constant (K w ) as follows: Where K w is the equilibrium constant for water (unitless) [H ] is the molar concentration of hydrogen [OH is the molar concentration of hydroxide An equilibrium constant less than one (1) suggests that the reaction prefers to stay on the side of the reactants in this case, water likes to stay as water. Because water hardly

55. OFCN's Academy Curricular Exchange - Science TITLE Determining acids and bases AUTHOR Melodie Hill, Lewis©Arriola Elem., COGRADE LEVEL/SUBJECT intermediate, science OVERVIEW An introduction to using http://www.ofcn.org/cyber.serv/academy/ace/sci/cecsci/cecsci119.html

Academy Curricular Exchange Columbia Education Center Science Click here to return to OFCN's Academy Curricular Exchange Click here to return to OFCN's Academy Click here to return to OFCN's Main Menu John Kurilec jmk@ofcn.org

56. PH: Acids And Bases Name Date _. pH acids ANDBASES. THINK FIRST! Liquids can either be neutral, an acid, or a base. http://www.galaxy.net/~k12/water/ph.shtml

pH: ACIDS AND BASES THINK FIRST! Liquids can either be neutral, an acid, or a base. A pH of 7 is neutral, a pH of 1-6 is acidic, and a pH of 8-14 is basic or alkaline. Liquids that are very acidic (pH of 1-2) or very alkaline (pH of 13-14) are dangerous and can burn you. What do you think the pH of drinking water is? MATERIALS 1 pH scale 1 paper towel 4 jars 7 labels 3 spoons 4 1-inch pieces of pH paper measuring cups measuring spoons water vinegar baking soda PROCEDURE 1. First, we're going to prepare samples of a mild acid and base. So that we can keep them straight, label the jars A, B, C and D. 2. Label the spoons A, B and D. 3. Put 1/4 cup of water in each of jars A, B and C. 4. Add 1 teaspoon of vinegar to the "A" jar and mix with the "A" spoon. 5. Add 1/4 teaspoon of baking soda to the "B" jar and mix with the "B" spoon until it is all dissolved. 6. pH paper changes to different colors depending on the pH of the solution being tested. Test the pH of the A, B and C solutions by briefly dipping the pH paper in the solution and immediately checking the color against the pH scale. What type of liquid is this? Jar pH Type (acid, base, neutral)

57. Determining Acids And Bases balance. The student will discuss the safety precautions required bothinside and outside a lab in handling acids and bases. Purpose ^. http://unite.ukans.edu/explorer/explorer-db/rsrc/783750699-447DED81.1.htm

Determining Acids and Bases Author Grade Level Subject Objectives ... Tying It Together Author: Melodie Hill Lewis Arriola Elementary, CO Grade Level: intermediate Subject(s): science Objectives: The student will use purple cabbage indicator to test five know substances for acidic/alkaline balance. The student will discuss the safety precautions required both inside and outside a lab in handling acids and bases. Purpose: To introduce acidity/alkalinity of substances using an indicator to determine their differences and safety precautions in handling of each. Description: An introduction to using indicators to determine acids and bases. Activities and Procedures: (Can be Lab or Demo) Label 4 clear containers with numbers 1 4. Fill each 1/2 way with water, white vinegar, ammonia and corn syrup. Have students note color, smell, etc. Do Not Taste. Drop a paper clip in each to discuss density and clue to the identity of corn syrup. Add 1 teas. purple cabbage indicator to each substance. Note color changes. vinegar red acid ammonia green base water purple neutral Have students start a chart to record their findings. ACTIVITY: Have students bring in some of their own to test. Some good examples are lemon juice, Isopropyl, shampoo, peroxide, window cleaner, milk, 7 up, aspirin, antacids, milk of magnesia, tea, orange juice, coke, coffee, detergent. Repeat procedure from activity 1. Add these findings to yesterdays chart.

58. Explorer: Determining Acids And Bases . An introduction to using indicators to determine acids and bases.......Determining acids and bases. Click here to receive a 3 KByte Text HTML file. http://unite.ukans.edu/explorer/explorer-db/html/783750699-447DED81.html

Determining Acids and Bases Click here to receive a 3 KByte "Text HTML" file. Click here to receive a KByte "Acrobat" file. Resource Type Lesson Plan Physical Media Downloadable File Grades Description "An introduction to using indicators to determine acids and bases. PURPOSE: To introduce acidity/alkalinity of substances using an indicator to determine their differences and safety precautions in handling of each. Objectives: 1. The student will use purple cabbage indicator to test five known substances for acidic/alkaline balance. 2. The student will discuss the safety precautions required both inside and outside a lab in handling acids and bases." Curriculum Natural Science/Physical Science/Properties of Matter/General Properties of Matter Natural Science/Physical Science/Properties of Matter/Classification of Matter Natural Science/Physical Science/Matter and Energy/Chemical Change ProcessSkills Natural Science Process/Gather Data/Observe Natural Science Process/Gather Data/Measure Natural Science Process/Gather Data/Record Natural Science Process/Analysis Synthesis Evaluation/Estimate Natural Science Process/Analysis Synthesis Evaluation/Infer Natural Science Process/Analysis Synthesis Evaluation/Investigate Natural Science Process/Analysis Synthesis Evaluation/Interpret Natural Science Process/Analysis Synthesis Evaluation/Hypothesize Natural Science Process/Analysis Synthesis Evaluation/Experiment Natural Science Process/Analysis Synthesis Evaluation/Problem Solve and Conclusions Natural Science Process/Communicate Ideas/Define Ideas

59. Solutions Of Acids And Bases Solutions of acids and bases. Results appear in the second table. In order touse this page, you need a table of acids and bases and their K values. http://chemistry2.csudh.edu/lecture_help/acidsols.html

Solutions of Acids and Bases This page let's you practice the fundamental calculation in acid/base systems: determining the pH of the solution. When you press "New Problem," the name of a chemical species will appear in the first cell and a concentration in the second cell. Calculate the pH of the solution and press "Check Answer". Results appear in the second table. In order to use this page, you need a table of acids and bases and their K values. If the compound which appears in the first cell is not in your table, press "New Problem" to get a new compound. Remember that the species can be an acid, a base or be neutral. If you miss a question three times, pressing the "Show Answer" button will cause the correct result to appear. Compound [initial] pH Results Total Correct

60. Learn.co.za : Chemistry Characteristics of acids and bases. Note Solutions acids and basesreact to neutralise each other. Points to remember ! Solutions http://www.learn.co.za/content/grade12/Science/chem_acidsbases/bass/Unit1/

You are here: Classroom Grade 12 Science Chemistry : Acids and Bases ... Acids and Bases : 1. Characteristics of Acids and Bases Other units in this lesson: 2. Acid/Base models 3. Conjugate Acid/Base pairs 4. Acid/Base terminology 5. pH scale and calculations ... 9. Hydrolysis Characteristics of acids and bases Note: Solutions of acids and bases cause a colour change of indicators. Acids and bases react to neutralise each other. Points to remember ! Solutions of acids or bases conduct electricity due to the presence of free ions. Acids taste sour and are clear. Bases feel soapy and are cloudy. Other units in this lesson: 2. Acid/Base models 3. Conjugate Acid/Base pairs 4. Acid/Base terminology 5. pH scale and calculations ... 9. Hydrolysis

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