How to balance chemical equations File
... This equation shows you what happens in the reaction, but it doesn’t show you how much of each element you need to produce the ammonia. To find out how much of each element you need, you have to balance the equation — make sure that the number of atoms on the left side of the equation equals the num ...
... This equation shows you what happens in the reaction, but it doesn’t show you how much of each element you need to produce the ammonia. To find out how much of each element you need, you have to balance the equation — make sure that the number of atoms on the left side of the equation equals the num ...
Calculations and Chemical Equations Atomic mass: Mass of an
... Individual products and reactants are separated by a plus sign Chemical Equation: A written statement using symbols and formulas to describe the changes that occur in a reaction Example: 2H2(g) + O2 (g) Æ 2H2O (l) Letter in parentheses indicates the state of the substance: gas (g), liquid (l), solid ...
... Individual products and reactants are separated by a plus sign Chemical Equation: A written statement using symbols and formulas to describe the changes that occur in a reaction Example: 2H2(g) + O2 (g) Æ 2H2O (l) Letter in parentheses indicates the state of the substance: gas (g), liquid (l), solid ...
Document
... together as one ion. • When molecular compounds dissolve in water, the only ones that can form ions in solution are acids and bases. The rest will just dissolve as the complete molecule (if that molecule is soluble in water) ...
... together as one ion. • When molecular compounds dissolve in water, the only ones that can form ions in solution are acids and bases. The rest will just dissolve as the complete molecule (if that molecule is soluble in water) ...
Exam #2
... 61. When acidified K2Cr2O7 solution is added to Na2S solution, green Cr3+ ions and free S are formed. When acidified K2Cr2O7 solution is added to NaCl, no change occurs. Of the substances involved in these reactions, which is the best reducing agent? (A) K2Cr2O7 (B) Na2S (C) Cr3+ (D) S (E) NaCl 62. ...
... 61. When acidified K2Cr2O7 solution is added to Na2S solution, green Cr3+ ions and free S are formed. When acidified K2Cr2O7 solution is added to NaCl, no change occurs. Of the substances involved in these reactions, which is the best reducing agent? (A) K2Cr2O7 (B) Na2S (C) Cr3+ (D) S (E) NaCl 62. ...
Semester 1 exam review
... go to the bathroom all the time) How many liters is this? Review questions for test on Ch. 3 1. What is the kinetic theory of matter? 2. What are the two definitions of a gas? 3. What makes air pressure on the atomic level? 4. What is pascal’s law? 5. The hydraulics on a high-low have a small piston ...
... go to the bathroom all the time) How many liters is this? Review questions for test on Ch. 3 1. What is the kinetic theory of matter? 2. What are the two definitions of a gas? 3. What makes air pressure on the atomic level? 4. What is pascal’s law? 5. The hydraulics on a high-low have a small piston ...
Chapters 12 – 20 Practice Problems
... 30. Calculate the entropy change of the surroundings at 25C for the reaction below. C3H8(g) + 5 O2(g) 3 CO2(g) + 4 H2O(g) ∆Hrxn = −2044 kJ A) 1.30 kJ/K B) 15.5 kJ/K C) 6.86 kJ/K D) 10.4 kJ/K E) 20.5 kJ/K 31. The reaction CCl4(g) C(s, graphite) + 2 Cl2(g) has ∆H = +95.7 kJ and ∆S = +142.2 J/K at ...
... 30. Calculate the entropy change of the surroundings at 25C for the reaction below. C3H8(g) + 5 O2(g) 3 CO2(g) + 4 H2O(g) ∆Hrxn = −2044 kJ A) 1.30 kJ/K B) 15.5 kJ/K C) 6.86 kJ/K D) 10.4 kJ/K E) 20.5 kJ/K 31. The reaction CCl4(g) C(s, graphite) + 2 Cl2(g) has ∆H = +95.7 kJ and ∆S = +142.2 J/K at ...
CHAPTER 2 THE CHEMISTRY OF LIFE 2.1 Chemical Elements
... iodine that is used to detect tumors in the thyroid gland. High levels of radiation can destroy cells and cause cancer; careful use of radiation can sterilize products and kill cancer cells. ...
... iodine that is used to detect tumors in the thyroid gland. High levels of radiation can destroy cells and cause cancer; careful use of radiation can sterilize products and kill cancer cells. ...
answers to part a of the canadian chemistry
... The people involved in preparing the CCC very much appreciate all the comments and feedback that we get from teachers. We have tried to incorporate some of these comments in with the solutions. We have also tried to indicate how students did in particular questions, although, unfortunately, we have ...
... The people involved in preparing the CCC very much appreciate all the comments and feedback that we get from teachers. We have tried to incorporate some of these comments in with the solutions. We have also tried to indicate how students did in particular questions, although, unfortunately, we have ...
Chapter 4: Reaction Stoichiometry Reaction Stoichiometry
... 1) Make sure you have a balanced equation. 2) Calculate the molar masses of all compounds that you are interested in. 3) From each starting material, determine the amount of the desired product that can be formed. 4) Compare the two product amounts; the lower amount is the amount that will be formed ...
... 1) Make sure you have a balanced equation. 2) Calculate the molar masses of all compounds that you are interested in. 3) From each starting material, determine the amount of the desired product that can be formed. 4) Compare the two product amounts; the lower amount is the amount that will be formed ...
Chapter 4 Chemical Quantities and Aqueous Reactions
... 5. If any of the possible products are insoluble, write their formulas as the products of the reaction using (s) after the formula to indicate solid. Write any soluble products with (aq) after the formula to indicate aqueous. 6. Balance the equation. – Remember to only change coefficients, not subsc ...
... 5. If any of the possible products are insoluble, write their formulas as the products of the reaction using (s) after the formula to indicate solid. Write any soluble products with (aq) after the formula to indicate aqueous. 6. Balance the equation. – Remember to only change coefficients, not subsc ...
fahad h. ahmad - Fahad`s Academy
... Freezing is the change of liquid to solid by cooling down of liquid. Freezing point is the temperature at which liquid freezes. A-B: liquid temperature decreases to freezing point. B-C: heat energy is released as particles slow down to take up fixed and orderly position of a solid. The temperature r ...
... Freezing is the change of liquid to solid by cooling down of liquid. Freezing point is the temperature at which liquid freezes. A-B: liquid temperature decreases to freezing point. B-C: heat energy is released as particles slow down to take up fixed and orderly position of a solid. The temperature r ...
PP - Columbia University
... • 1) Water: 55 M (pure water) is considered the “unit” concentration instead of 1M The concentration of water rarely changes during the course of an aqueous reaction, since water is at such a high concentration. • So when calulating Go, instead of writing in “55” when water participates in a reacti ...
... • 1) Water: 55 M (pure water) is considered the “unit” concentration instead of 1M The concentration of water rarely changes during the course of an aqueous reaction, since water is at such a high concentration. • So when calulating Go, instead of writing in “55” when water participates in a reacti ...
AP Chem
... 70g of FeO? A. 22 B. 33 C. 44 D. 55 E. 66 19. A beaker containing 150ml of .2M Pb(NO3)2 is added to a beaker containing 50ml of .2M MgCl2. What is the final concentration of Pb2+ ions in the solution? A. .2M B. .1M C. .05M D. .025M E. .012M 20. One half liter of .2M HCl is added to one half liter of ...
... 70g of FeO? A. 22 B. 33 C. 44 D. 55 E. 66 19. A beaker containing 150ml of .2M Pb(NO3)2 is added to a beaker containing 50ml of .2M MgCl2. What is the final concentration of Pb2+ ions in the solution? A. .2M B. .1M C. .05M D. .025M E. .012M 20. One half liter of .2M HCl is added to one half liter of ...
Chapter 4 Lecture Notes in PowerPoint
... 5. If any of the possible products are insoluble, write their formulas as the products of the reaction using (s) after the formula to indicate solid. Write any soluble products with (aq) after the formula to indicate aqueous. 6. Balance the equation. – Remember to only change coefficients, not subsc ...
... 5. If any of the possible products are insoluble, write their formulas as the products of the reaction using (s) after the formula to indicate solid. Write any soluble products with (aq) after the formula to indicate aqueous. 6. Balance the equation. – Remember to only change coefficients, not subsc ...
2004 NEACS Ashdown Exam 1. The allotrope of carbon shown to
... 29. The molar mass of the gas was determined in the vapor density method. The molar mass of a gas whose density at 714 torr and 125°C is 4.43 g/L was found to be (A) 43 (B) 48 (C) 136 (D) 154 30. For the reaction of the decomposition of formic acid: HCOOH(l) Æ CO(g) + H2O(l), ∆H = 15.79 kJ and ∆S = ...
... 29. The molar mass of the gas was determined in the vapor density method. The molar mass of a gas whose density at 714 torr and 125°C is 4.43 g/L was found to be (A) 43 (B) 48 (C) 136 (D) 154 30. For the reaction of the decomposition of formic acid: HCOOH(l) Æ CO(g) + H2O(l), ∆H = 15.79 kJ and ∆S = ...
Notes Unit 5-4
... b) _ C3H8 + _ O2 ---> _ CO2 + _ H2O 2. A reaction yield 25%, how many grams of CO2 produced if the expected amount is 80g? ...
... b) _ C3H8 + _ O2 ---> _ CO2 + _ H2O 2. A reaction yield 25%, how many grams of CO2 produced if the expected amount is 80g? ...
rate of chemical reaction and chemical equilibrium
... (ii) At equilibrium, microscopic (at molecular level) processes continue, but they are in balance. This means that no overall large scale (macroscopic) changes occur. Rate of forward process (reaction) is equal to the rate of reverse process, and as a consequence of this, no net change results. ...
... (ii) At equilibrium, microscopic (at molecular level) processes continue, but they are in balance. This means that no overall large scale (macroscopic) changes occur. Rate of forward process (reaction) is equal to the rate of reverse process, and as a consequence of this, no net change results. ...
June 2010 Regents Exam Part C Questions
... electrolytic cell? (1) It produces electrical energy. (2) It requires an external energy source. (3) It uses radioactive nuclides. (4) It undergoes a spontaneous redox reaction. Q25 Which compound when dissolved in water is an Arrhenius acid? (1) CH3OH (3) NaCl (2) HCl (4) NaOH ...
... electrolytic cell? (1) It produces electrical energy. (2) It requires an external energy source. (3) It uses radioactive nuclides. (4) It undergoes a spontaneous redox reaction. Q25 Which compound when dissolved in water is an Arrhenius acid? (1) CH3OH (3) NaCl (2) HCl (4) NaOH ...
35 - TAMU Chemistry
... • Colorless, odorless, tasteless Allotropes: (different molecular forms of the same element) • O2 • O3 ...
... • Colorless, odorless, tasteless Allotropes: (different molecular forms of the same element) • O2 • O3 ...
Lab 3. Chemical Reactions
... Colorless, odorless, and not flammable at all. Large amounts will actually put out a flame so it is used as the gas in standard fire extinguishers. Very toxic. Colorless. Has the odor of rotten eggs. Colorless, odorless, but highly flammable. When a burning splint comes in contact with a test tube o ...
... Colorless, odorless, and not flammable at all. Large amounts will actually put out a flame so it is used as the gas in standard fire extinguishers. Very toxic. Colorless. Has the odor of rotten eggs. Colorless, odorless, but highly flammable. When a burning splint comes in contact with a test tube o ...
Unit 1 Notes
... 2) Compounds – substances that contain atoms of more than one element combined in a definite, fixed proportion. Compounds are represented by chemical formulas that contain two or more different symbols. e.g. Water’s chemical formula is H2O – (2 hydrogen atoms and 1 oxygen atom make 1 water molecul ...
... 2) Compounds – substances that contain atoms of more than one element combined in a definite, fixed proportion. Compounds are represented by chemical formulas that contain two or more different symbols. e.g. Water’s chemical formula is H2O – (2 hydrogen atoms and 1 oxygen atom make 1 water molecul ...
Topic 5 Reacting masses and chemical equations notes
... shows the actual number of each type of atom present. However for ionic substances and macromolecules, which have giant structures, the formula shows the ratio of ions or atoms of each type. We can use valencies to help us work out the formula of a compound. The valency of an element is the number o ...
... shows the actual number of each type of atom present. However for ionic substances and macromolecules, which have giant structures, the formula shows the ratio of ions or atoms of each type. We can use valencies to help us work out the formula of a compound. The valency of an element is the number o ...
AP CHEMISTRY SUMMER ASSIGNMENT
... 16. Label each of the following as a physical or chemical change. a. ink is separated by chromatography into its components b. sugar is dissolved in water c. sodium and chlorine react explosively when combined d. an ice cube melts e. metal oxidizes in the presence of oxygen ...
... 16. Label each of the following as a physical or chemical change. a. ink is separated by chromatography into its components b. sugar is dissolved in water c. sodium and chlorine react explosively when combined d. an ice cube melts e. metal oxidizes in the presence of oxygen ...
Honors Chemistry
... : a species that appears in some steps but not in the overall reaction. It is relatively short lived. So, in the above example, H2I is the reaction intermediate. ...
... : a species that appears in some steps but not in the overall reaction. It is relatively short lived. So, in the above example, H2I is the reaction intermediate. ...
Redox
Redox reactions include all chemical reactions in which atoms have their oxidation state changed; in general, redox reactions involve the transfer of electrons between species. The term ""redox"" comes from two concepts involved with electron transfer: reduction and oxidation. It can be explained in simple terms: Oxidation is the loss of electrons or an increase in oxidation state by a molecule, atom, or ion. Reduction is the gain of electrons or a decrease in oxidation state by a molecule, atom, or ion.Although oxidation reactions are commonly associated with the formation of oxides from oxygen molecules, these are only specific examples of a more general concept of reactions involving electron transfer.Redox reactions, or oxidation-reduction reactions, have a number of similarities to acid–base reactions. Like acid–base reactions, redox reactions are a matched set, that is, there cannot be an oxidation reaction without a reduction reaction happening simultaneously. The oxidation alone and the reduction alone are each called a half-reaction, because two half-reactions always occur together to form a whole reaction. When writing half-reactions, the gained or lost electrons are typically included explicitly in order that the half-reaction be balanced with respect to electric charge.Though sufficient for many purposes, these descriptions are not precisely correct. Oxidation and reduction properly refer to a change in oxidation state — the actual transfer of electrons may never occur. The oxidation state of an atom is the fictitious charge that an atom would have if all bonds between atoms of different elements were 100% ionic. Thus, oxidation is better defined as an increase in oxidation state, and reduction as a decrease in oxidation state. In practice, the transfer of electrons will always cause a change in oxidation state, but there are many reactions that are classed as ""redox"" even though no electron transfer occurs (such as those involving covalent bonds).There are simple redox processes, such as the oxidation of carbon to yield carbon dioxide (CO2) or the reduction of carbon by hydrogen to yield methane (CH4), and more complex processes such as the oxidation of glucose (C6H12O6) in the human body through a series of complex electron transfer processes.