AP Chemistry
... Percent Yield of CO2 Gas Lab (Wear Goggles) 19. Completely react NaHCO3(s) with 6 M HCl, according to the net ionic equation HCO3- + H+ H2O + CO2(g), measure the volume of CO2 and compare this to the theoretical yield. Mass 0.6 g NaHCO3 and record its mass (m) to the nearest 0.001 g. Add the NaHCO ...
... Percent Yield of CO2 Gas Lab (Wear Goggles) 19. Completely react NaHCO3(s) with 6 M HCl, according to the net ionic equation HCO3- + H+ H2O + CO2(g), measure the volume of CO2 and compare this to the theoretical yield. Mass 0.6 g NaHCO3 and record its mass (m) to the nearest 0.001 g. Add the NaHCO ...
Principles of Chemistry 1 and 2 Notes
... a. Draw Lewis structure of the compound. a. Count # of bonding pairs (central atom / terminal atoms). a. Count # of lone pairs (nonbonding); (around the central atoms ONLY) a. Look at the tables 10.1 and 10.2 (pages 369 and 375, respectively) in the textbook and figure out the electron bonding pair ...
... a. Draw Lewis structure of the compound. a. Count # of bonding pairs (central atom / terminal atoms). a. Count # of lone pairs (nonbonding); (around the central atoms ONLY) a. Look at the tables 10.1 and 10.2 (pages 369 and 375, respectively) in the textbook and figure out the electron bonding pair ...
NO - Blue Devil Chem
... gas causing the column of carbon puff up, just like gases during cooking cause a cake to rise. The name carbohydrate derives from the formula of sugars such as sucrose, C12H22O11 (notice the 2:1 H:O ratio C12(H2O)11) in which the formula appears to be a hydrate of carbon. C12H22O11(s) → 11H2O(g) + 1 ...
... gas causing the column of carbon puff up, just like gases during cooking cause a cake to rise. The name carbohydrate derives from the formula of sugars such as sucrose, C12H22O11 (notice the 2:1 H:O ratio C12(H2O)11) in which the formula appears to be a hydrate of carbon. C12H22O11(s) → 11H2O(g) + 1 ...
Bk2P06EE
... NH4+ is a strong conjugate acid and hydrolyzes in water: NH4+(aq) + H2O(l) NH3(aq) + H3O+(aq) The hydroxonium ion is acidic. Since an increase in acidity reduces alkalinity, the presence of ammonium ions decreases the formation of insoluble magnesium hydroxide and favours the formation of magnesium ...
... NH4+ is a strong conjugate acid and hydrolyzes in water: NH4+(aq) + H2O(l) NH3(aq) + H3O+(aq) The hydroxonium ion is acidic. Since an increase in acidity reduces alkalinity, the presence of ammonium ions decreases the formation of insoluble magnesium hydroxide and favours the formation of magnesium ...
Stoichiometry, Lab Basics, Reactions
... Aluminum reacts with hydrochloric acid, as indicated in the equation above, to produce hydrogen gas. The H2 produced was then collected by water displacement at 27C (where the vapor pressure of water is 21 torr) and a barometric pressure of 757 torr. If 0.555 L of gas is collected, the partial pre ...
... Aluminum reacts with hydrochloric acid, as indicated in the equation above, to produce hydrogen gas. The H2 produced was then collected by water displacement at 27C (where the vapor pressure of water is 21 torr) and a barometric pressure of 757 torr. If 0.555 L of gas is collected, the partial pre ...
Thermochemistry Exam Review Questions
... B. Cl- ions are repelled by the hydrogen atoms of the water molecules C. Na+ ions are attracted to the oxygen atoms of the water molecules D. Na+ ions are repelled by the oxygen atoms of the water molecules 13 Which of the following would produce a precipitate when equal volumes of 0.5 mol/L of aqu ...
... B. Cl- ions are repelled by the hydrogen atoms of the water molecules C. Na+ ions are attracted to the oxygen atoms of the water molecules D. Na+ ions are repelled by the oxygen atoms of the water molecules 13 Which of the following would produce a precipitate when equal volumes of 0.5 mol/L of aqu ...
Comparison of homogeneous and heterogeneous catalysis
... of FFA to methyl esters increased with the increase in catalyst amount. With 0.5% H2SO4, the acid value reduced to 11.40 mg KOH/g which further reduced to 6.50 with 1.3% of H2SO4. The acid value of mahua oil was further reduced to 2.07 mg KOH/g with 1.5% (v/v) H2SO4. Further increase in the catalyst ...
... of FFA to methyl esters increased with the increase in catalyst amount. With 0.5% H2SO4, the acid value reduced to 11.40 mg KOH/g which further reduced to 6.50 with 1.3% of H2SO4. The acid value of mahua oil was further reduced to 2.07 mg KOH/g with 1.5% (v/v) H2SO4. Further increase in the catalyst ...
Answers to examination questions
... Q21 C Avogadro’s hypothesis: the number of particles in a gas is directly proportional to volume at the same temperature and pressure. Q22 D Average kinetic energy of gas particles is directly proportional to the absolute temperature in kelvin. Q23 D High pressure will bring the gas mole ...
... Q21 C Avogadro’s hypothesis: the number of particles in a gas is directly proportional to volume at the same temperature and pressure. Q22 D Average kinetic energy of gas particles is directly proportional to the absolute temperature in kelvin. Q23 D High pressure will bring the gas mole ...
Mineralization of Drugs in Aqueous Medium by Advanced Oxidation
... This procedure is known as anodic oxidation with H2O2 electrogeneration. The electro-Fenton process involves the enhancement of the oxidizing power of the above electrolytic system by adding small amounts of a catalyst like Fe2+, which reacts with electrogenerated H2O2 to yield •OH in solution from ...
... This procedure is known as anodic oxidation with H2O2 electrogeneration. The electro-Fenton process involves the enhancement of the oxidizing power of the above electrolytic system by adding small amounts of a catalyst like Fe2+, which reacts with electrogenerated H2O2 to yield •OH in solution from ...
Grade 11 review answers
... c) Why is methane gas not ideal at very low temperatures and high pressures? London forces are able to attract gas molecules together at low temperatures and high pressure. ...
... c) Why is methane gas not ideal at very low temperatures and high pressures? London forces are able to attract gas molecules together at low temperatures and high pressure. ...
COMPLEX IONS AND AMPHOTERISM
... An amphoteric substance is one that can behave as a Lewis acid and a Brønsted base. The best examples are found with metal hydroxides such as aluminum hydroxide [Al(OH)3] and zinc hydroxide [Zn(OH)2]. Insoluble aluminum hydroxide can be formed by the addition of hydroxide ion, OH-, to a soluble salt ...
... An amphoteric substance is one that can behave as a Lewis acid and a Brønsted base. The best examples are found with metal hydroxides such as aluminum hydroxide [Al(OH)3] and zinc hydroxide [Zn(OH)2]. Insoluble aluminum hydroxide can be formed by the addition of hydroxide ion, OH-, to a soluble salt ...
x - SharpSchool
... NH3(aq) + H2O(l) ⇌ NH4+(aq) + OH-(aq) water does not have to be involved! H+ ...
... NH3(aq) + H2O(l) ⇌ NH4+(aq) + OH-(aq) water does not have to be involved! H+ ...
Chemistry - Higher tier - Paper 4 - Sample assessment material
... A student heats 1.89 g of zinc nitrate until there is no further reaction. What is the total volume of gas, measured at room temperature and pressure, made in this reaction? Assume that one mole of gas occupies a volume of 24 dm3 at room temperature and ...
... A student heats 1.89 g of zinc nitrate until there is no further reaction. What is the total volume of gas, measured at room temperature and pressure, made in this reaction? Assume that one mole of gas occupies a volume of 24 dm3 at room temperature and ...
1.24 calculations and chemical reactions
... reaction. Calculate the relative molecular mass, Mr, of H2A 4.2) Sodium carbonate forms several hydrates of general formula Na2CO3.xH2O. A 2.98 g sample of one of these hydrates was dissolved in water and the solution made up to 250cm3. In a titration, a 25.0 cm3 portion of this solution required 28 ...
... reaction. Calculate the relative molecular mass, Mr, of H2A 4.2) Sodium carbonate forms several hydrates of general formula Na2CO3.xH2O. A 2.98 g sample of one of these hydrates was dissolved in water and the solution made up to 250cm3. In a titration, a 25.0 cm3 portion of this solution required 28 ...
Chemistry - RESONANCE PCCP IDEAL for NTSE, IJSO, Olympiads
... Mol wt. or At. wt No. of electrons lost or gained by one molecule of the substance ...
... Mol wt. or At. wt No. of electrons lost or gained by one molecule of the substance ...
Mechanistic Studies of the Reactions of Silicon
... basis of spectroscopic data, after isolation by semipreparative gas chromatography (GC). The same products were obtained from photolyses in acetonitrile solution, along with small amounts of 9a due to the presence of residual water in the solvent. In the absence of a trapping reagent, photolysis of ...
... basis of spectroscopic data, after isolation by semipreparative gas chromatography (GC). The same products were obtained from photolyses in acetonitrile solution, along with small amounts of 9a due to the presence of residual water in the solvent. In the absence of a trapping reagent, photolysis of ...
Questions
... III The acidic solution in the beaker was filtered into a 250 cm3 volumetric flask. A small amount of solid impurity remained in the filter paper. The solution in the volumetric flask was carefully made up to 250 cm3 with distilled water. IV A pipette was used to transfer 25.0 cm3 portions of the ac ...
... III The acidic solution in the beaker was filtered into a 250 cm3 volumetric flask. A small amount of solid impurity remained in the filter paper. The solution in the volumetric flask was carefully made up to 250 cm3 with distilled water. IV A pipette was used to transfer 25.0 cm3 portions of the ac ...
Acid
An acid (from the Latin acidus/acēre meaning sour) is a chemical substance whose aqueous solutions are characterized by a sour taste, the ability to turn blue litmus red, and the ability to react with bases and certain metals (like calcium) to form salts. Aqueous solutions of acids have a pH of less than 7. Non-aqueous acids are usually formed when an anion (negative ion) reacts with one or more positively charged hydrogen cations. A lower pH means a higher acidity, and thus a higher concentration of positive hydrogen ions in the solution. Chemicals or substances having the property of an acid are said to be acidic.There are three common definitions for acids: the Arrhenius definition, the Brønsted-Lowry definition, and the Lewis definition. The Arrhenius definition defines acids as substances which increase the concentration of hydrogen ions (H+), or more accurately, hydronium ions (H3O+), when dissolved in water. The Brønsted-Lowry definition is an expansion: an acid is a substance which can act as a proton donor. By this definition, any compound which can easily be deprotonated can be considered an acid. Examples include alcohols and amines which contain O-H or N-H fragments. A Lewis acid is a substance that can accept a pair of electrons to form a covalent bond. Examples of Lewis acids include all metal cations, and electron-deficient molecules such as boron trifluoride and aluminium trichloride.Common examples of acids include hydrochloric acid (a solution of hydrogen chloride which is found in gastric acid in the stomach and activates digestive enzymes), acetic acid (vinegar is a dilute solution of this liquid), sulfuric acid (used in car batteries), and tartaric acid (a solid used in baking). As these examples show, acids can be solutions or pure substances, and can be derived from solids, liquids, or gases. Strong acids and some concentrated weak acids are corrosive, but there are exceptions such as carboranes and boric acid.