an understanding of the reactivity series; (e) Arrange metals in order of reactivity (Sodium, Calcium, Magnesium, Zinc, Iron, Copper, Silver and Gold); (f) Recall what are acids and bases; (g) State the importance of acids and bases; (h) Recall the colours of indicators (methyl orange, phenolphthalein, litmus) in acids and alkalis 2. THE LANGUAGE OF CHEMISTRY Students should be able to: (a) Describe physical changes giving examples; (b) Describe chemical changes giving examples;
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collects on the enamel of the tooth, building a layer that makes the tooth more acid-resistant. This will help aid in less bacteria formation, which can overall decrease caries. Calcium Sodium Phosphate (CSP)is a mixture of compounds known to help with dental hypersensitivity, including toothpastes, desensitizing toothpastes, prophy paste, and air polishing powder. When exposed to saliva, the sodium helps resist acid, while in time the calcium and phosphate assist in remineralization. Most of the
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has a chemical that changes color when it comes in contact with acids or bases. For example, the litmus and pH paper turns red if the acid is strong and turns blue if the base is strong. There are only a few pH indicators that measure pH over a wide variety of pH values. Therefore you will need to find out the pH range of the indicator you use. Color pH indicators only provide an approximate measure of the pH, or the strength of the acid or base(swc2.hccs.edu). They are not as accurate as the instruments
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Introduction to Acids and Bases Why? Is water an acid, a base, neither, or both? There are three different ways to define a substance as an acid or base. One definition is based on the ions found in a compound (Arrhenius), another is based on how a compound behaves when added to water (Bronsted-Lowry), and a third is based on how a molecule reacts with other molecules (Lewis). These definitions address different behaviors of compounds and explain how seemingly different compounds can be classified
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Biology The study of life Characteristics of Life #1 Made of 1 or more cells: -cells are the smallest units of life -ex: bacteria (1 cell) -ex: humans (trillions of cells) Characteristics of Life #2 Reproduction: -reproduce and pass on genetic material to next generation Characteristics of Life #3 Maintain homeostasis (balance): -homeostasis: balance with organism -ex: regulating body temerature Characteristics of Life #4 Require energy: -cells require
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PH: PH is the level of acidity or basicity in a body of water. Anything less than 7 is considered acidic anything above 7 is basic. Around neutral or 7 is a healthy reading for PH but slightly higher or lower than that is fine too. To test for turbidity you put some water in a PH meter or in a solution to find out for the reading. In Milton we had a reading of 7.6 for the meter and a 7.1 for the solution. In mcnulty we had 6.7 with the meter and 7.1 with the solution these are all good readings for
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the rate of each reaction from 0(no reaction)-5(very fast). Test the effect of pH on catalase activity using basic, acidic and neutral solutions. 2 ml hydrogen peroxide will be added to each of 5 clean test tubes. Tube 1--add 3 drops of HCl (acid) Tube 2 - dilute HCl (1 drop / 3 ml) – add 3 drops Use pH paper to determine the exact pH Tube 3 – add 3 drops of NaOH (Base) Tube 4 – dilute NaOH (1 drop / 3 ml) - add 3
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Methyl red test is used to determine whether bacteria can perform mixed-acid fermentations when supplied with glucose (Ramakrishnan, & Sulochana, 2012). Methyl red test shows positive when the culture medium turns red after methyl red is added, because of a pH level of 4.4 or below from the fermentation of glucose. On the other hand, methyl red test is negative when the culture medium remains yellow, which occurs when little acid is produced due to the glucose being fermented i.e. high pH level of
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lab room, fill in the following table: |Solution Number |pH from Lab |Acid, Base or Neutral? |Solution Name (what was in the test tube?) | |Solution 1 |6 |Acid |Pure Water | |Solution 2 |1 |Acid |Lemon Juice | |Solution 3
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Titration in this lab is performed with the chemical reactions between acids and liquids. During titration, we have to stop at the point where stoichiometric amounts of acids and bases are reacting. We can find that point by looking for indicators, for example in this lab the indicators were changes in color. So the purpose of all this is to determine the concentration of some acid solutions. 1. Measure 10 mL of your acid solution using graduated cylinder and and it to the Erlenmeyer flask
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