PART 2 – CHEMISTRY
... Let's look at why and how elements combine to form the molecules of every substance around us. If there are 2 electrons in a single shell surrounding the nucleus or 8 electrons in the outermost shell in the case where the atom has more than one shell, then the atom is said to be stable. This means t ...
... Let's look at why and how elements combine to form the molecules of every substance around us. If there are 2 electrons in a single shell surrounding the nucleus or 8 electrons in the outermost shell in the case where the atom has more than one shell, then the atom is said to be stable. This means t ...
matter
... change) is a change in a substance or substances that results in a totally new substance – Ex: 2H2(g) + O2(g) 2H2O(g) Notice that the reactants (the substances you start with) combine to form a new substance (the product) ...
... change) is a change in a substance or substances that results in a totally new substance – Ex: 2H2(g) + O2(g) 2H2O(g) Notice that the reactants (the substances you start with) combine to form a new substance (the product) ...
View Article - Asian Journal of Chemistry
... sodium hydroxide solution. Liquid bromine ( 4.2 mL, 80 mmol) was added dropwise in 2 h when the mixture maintained at 100 - 130 ºC heated by oil bath, excess time was prolonged for reaction until the colour of the reaction mixture turned to light yellow, after that the oil bath was removed and ethyl ...
... sodium hydroxide solution. Liquid bromine ( 4.2 mL, 80 mmol) was added dropwise in 2 h when the mixture maintained at 100 - 130 ºC heated by oil bath, excess time was prolonged for reaction until the colour of the reaction mixture turned to light yellow, after that the oil bath was removed and ethyl ...
apchem - practice midterm_shs
... mark completely, and then record your new answer. Mark only one answer for each question. Many candidates wonder whether or not to guess the answers to questions about which they are uncertain. In this section of the examination, as a correction for haphazard guessing, one-fourth of the number of qu ...
... mark completely, and then record your new answer. Mark only one answer for each question. Many candidates wonder whether or not to guess the answers to questions about which they are uncertain. In this section of the examination, as a correction for haphazard guessing, one-fourth of the number of qu ...
So where did all the matter on Earth come from - Bennatti
... atomic number of helium is two. Each helium atom has two protons. No other element is made of atoms with two protons in the nucleus. Each element is represented with a chemical symbol. Most chemical symbols are one or two letters. The first letter is always capitalized. If it has two or three letter ...
... atomic number of helium is two. Each helium atom has two protons. No other element is made of atoms with two protons in the nucleus. Each element is represented with a chemical symbol. Most chemical symbols are one or two letters. The first letter is always capitalized. If it has two or three letter ...
AP CHEMISTRY - An Incomplete List of Topics
... Multiply each half-reaction by an appropriate number to make the electron changes equal. Step 7: Combine the two half-reactions and simplify(subtract substances that appear on both the reactant and product sides of the equation). Check to see if the numbers of atoms of each element and total charges ...
... Multiply each half-reaction by an appropriate number to make the electron changes equal. Step 7: Combine the two half-reactions and simplify(subtract substances that appear on both the reactant and product sides of the equation). Check to see if the numbers of atoms of each element and total charges ...
AP Chapter Five Outline
... 2 HCl (aq) + Na2S (aq) 2 NaCl (aq) + H2S (g) B. Precipitation Reactions: when in an exchange reaction an insoluble product – a precipitate – is formed BaCl2 (aq) + Na2SO4 (aq) BaSO4 (s) + 2NaCl (aq) C. Net Ionic Equations: Equations that includes only the symbols or formulas of ions in solution ...
... 2 HCl (aq) + Na2S (aq) 2 NaCl (aq) + H2S (g) B. Precipitation Reactions: when in an exchange reaction an insoluble product – a precipitate – is formed BaCl2 (aq) + Na2SO4 (aq) BaSO4 (s) + 2NaCl (aq) C. Net Ionic Equations: Equations that includes only the symbols or formulas of ions in solution ...
The MOLE
... Avogadro’s number Avogadro's number and is denoted by NA. It is derived from exactly 12 grams of carbon-12. 12 grams of carbon-12 has approximately 6.02 x 1023 atoms. ...
... Avogadro’s number Avogadro's number and is denoted by NA. It is derived from exactly 12 grams of carbon-12. 12 grams of carbon-12 has approximately 6.02 x 1023 atoms. ...
Unit 2: Biochem Notes
... - A solution with a pH __________ 7, has more OH- ions than H+ ions, and is basic. - A solution with a pH _________ 7, has more H+ ions than OH- ions, and is acidic. b. buffer – Weak acids or bases that can react with strong acids or bases to prevent sharp, sudden changes in pH. Buffers make acidic ...
... - A solution with a pH __________ 7, has more OH- ions than H+ ions, and is basic. - A solution with a pH _________ 7, has more H+ ions than OH- ions, and is acidic. b. buffer – Weak acids or bases that can react with strong acids or bases to prevent sharp, sudden changes in pH. Buffers make acidic ...
Chapter 8 Thermochemistry: Chemical Energy
... A propellant for rockets is obtained by mixing the liquids hydrazine, N2H4, and dinitrogen tetroxide, N2O4. These compounds react to give gaseous nitrogen, N2 and water vapor, evolving 1049 kJ of heat at constant pressure when 1 mol N2O4 reacts. Write the thermochemical equation for this reaction ...
... A propellant for rockets is obtained by mixing the liquids hydrazine, N2H4, and dinitrogen tetroxide, N2O4. These compounds react to give gaseous nitrogen, N2 and water vapor, evolving 1049 kJ of heat at constant pressure when 1 mol N2O4 reacts. Write the thermochemical equation for this reaction ...
solution is a solution that contains the maximum amount of solute
... When comparing ionic and molecular compounds, it is found that ionic compounds are usually composed of __metals_ combined with __non-metals_ while molecular compounds are usually composed of __nonmetals__ combined with ___non-metals___ . ...
... When comparing ionic and molecular compounds, it is found that ionic compounds are usually composed of __metals_ combined with __non-metals_ while molecular compounds are usually composed of __nonmetals__ combined with ___non-metals___ . ...
Core Idea PS1 Matter and Its Interactions How can one explain the
... electrical forces (within and between atoms) stable forms of matter electric field energy magnetic field energy stable molecule ( has less energy, by an amount known as the binding energy, than the s ...
... electrical forces (within and between atoms) stable forms of matter electric field energy magnetic field energy stable molecule ( has less energy, by an amount known as the binding energy, than the s ...
Chapter 1: Quiz Review - Wetaskiwin Composite High School
... conductivity, pH, solubility, state • predict whether an ionic compound is relatively soluble in water, using a solubility chart • relate the molecular structure of simple substances to their properties (e.g., describe how the properties of water are due to the polar nature of water molecules, and r ...
... conductivity, pH, solubility, state • predict whether an ionic compound is relatively soluble in water, using a solubility chart • relate the molecular structure of simple substances to their properties (e.g., describe how the properties of water are due to the polar nature of water molecules, and r ...
Multiple-choice questions : 1. The following graph shows the volume
... the second statement is a correct explanation of the first statement. Then select one option from A to D according to the following table: A. Both statements are true and the 2nd statement is a correct explanation of the 1st statement. B. Both statements are true and the 2nd statement is NOT a corre ...
... the second statement is a correct explanation of the first statement. Then select one option from A to D according to the following table: A. Both statements are true and the 2nd statement is a correct explanation of the 1st statement. B. Both statements are true and the 2nd statement is NOT a corre ...
PPT - mvhs-fuhsd.org
... Enthalpy is an extensive property. hence it is proportional to the amount of reactants and products. e.g. for decomposition of two moles of water twice as much energy is needed as for one mole of water. H for a reaction in the forward direction is equal in size, but opposite in sign, to H for the ...
... Enthalpy is an extensive property. hence it is proportional to the amount of reactants and products. e.g. for decomposition of two moles of water twice as much energy is needed as for one mole of water. H for a reaction in the forward direction is equal in size, but opposite in sign, to H for the ...
Les Brown
... Ca = 0.900 g/40.1 g/mole = 0.0224 mole Cl = 1.60 g/35.5 g/mole = 0.0451 mole THE MOLE RATIO IS 0.0224 mole Ca TO 00451 mole Cl. STEP 2: CALCULATE THE SIMPLEST WHOLE NUMBER RATIO. Ca = 0.0224/0.0224 = 1 Cl = 0.0451/0.0224 = 2.01 or 2 THE EMPIRICAL FORMULA IS CaCl2 ...
... Ca = 0.900 g/40.1 g/mole = 0.0224 mole Cl = 1.60 g/35.5 g/mole = 0.0451 mole THE MOLE RATIO IS 0.0224 mole Ca TO 00451 mole Cl. STEP 2: CALCULATE THE SIMPLEST WHOLE NUMBER RATIO. Ca = 0.0224/0.0224 = 1 Cl = 0.0451/0.0224 = 2.01 or 2 THE EMPIRICAL FORMULA IS CaCl2 ...
Spring 2009 Final Exam Review – Part 2
... VOLUME OF GAS AT STP Molar Mass: the mass of 1 mol of any substance For an element: it’s the atomic mass For a compound: it’s the sum of the atomic masses of all elements in the substance Ex. Li2O Li = 2 6.94g = 13.88g O = 1 16.00g = 16.00g Li = 29.88g % Composition: is the percentage of t ...
... VOLUME OF GAS AT STP Molar Mass: the mass of 1 mol of any substance For an element: it’s the atomic mass For a compound: it’s the sum of the atomic masses of all elements in the substance Ex. Li2O Li = 2 6.94g = 13.88g O = 1 16.00g = 16.00g Li = 29.88g % Composition: is the percentage of t ...
Final Review Sheet Answers (the 6 page packet)
... When 0.400 mole of potassium reacts with excess water at standard temperature and pressure as shown in the equation above, the volume of hydrogen gas produced is (A) 1.12 liters (B) 2.24 liters (C) 3.36 liters (D) 4.48 liters (E) 6.72 liters ...
... When 0.400 mole of potassium reacts with excess water at standard temperature and pressure as shown in the equation above, the volume of hydrogen gas produced is (A) 1.12 liters (B) 2.24 liters (C) 3.36 liters (D) 4.48 liters (E) 6.72 liters ...
DEPARTMENT OF CHEMISTRY
... 2. SN1 Reaction. For the SN1 reaction, the nucleophile is ethanol, introduced into the solution as the solvent in a silver nitrate-ethanol solution. If the reaction occurs, silver chloride or silver bromide will form a precipitate in ethanol. The general reaction is: R-X + AgNO3 ...
... 2. SN1 Reaction. For the SN1 reaction, the nucleophile is ethanol, introduced into the solution as the solvent in a silver nitrate-ethanol solution. If the reaction occurs, silver chloride or silver bromide will form a precipitate in ethanol. The general reaction is: R-X + AgNO3 ...
Stoichiometry
Stoichiometry /ˌstɔɪkiˈɒmɨtri/ is the calculation of relative quantities of reactants and products in chemical reactions.Stoichiometry is founded on the law of conservation of mass where the total mass of the reactants equals the total mass of the products leading to the insight that the relations among quantities of reactants and products typically form a ratio of positive integers. This means that if the amounts of the separate reactants are known, then the amount of the product can be calculated. Conversely, if one reactant has a known quantity and the quantity of product can be empirically determined, then the amount of the other reactants can also be calculated.As seen in the image to the right, where the balanced equation is:CH4 + 2 O2 → CO2 + 2 H2O.Here, one molecule of methane reacts with two molecules of oxygen gas to yield one molecule of carbon dioxide and two molecules of water. Stoichiometry measures these quantitative relationships, and is used to determine the amount of products/reactants that are produced/needed in a given reaction. Describing the quantitative relationships among substances as they participate in chemical reactions is known as reaction stoichiometry. In the example above, reaction stoichiometry measures the relationship between the methane and oxygen as they react to form carbon dioxide and water.Because of the well known relationship of moles to atomic weights, the ratios that are arrived at by stoichiometry can be used to determine quantities by weight in a reaction described by a balanced equation. This is called composition stoichiometry.Gas stoichiometry deals with reactions involving gases, where the gases are at a known temperature, pressure, and volume and can be assumed to be ideal gases. For gases, the volume ratio is ideally the same by the ideal gas law, but the mass ratio of a single reaction has to be calculated from the molecular masses of the reactants and products. In practice, due to the existence of isotopes, molar masses are used instead when calculating the mass ratio.