Stoichiometry: Calculations with Chemical Formulas and Equations
... molecular formula is a multiple of the number of atoms in an empirical formula. • If we find the empirical formula and know a molar mass (molecular weight) for the compound, we can find the molecular formula. Stoichiometry © 2015 Pearson Education, Inc. ...
... molecular formula is a multiple of the number of atoms in an empirical formula. • If we find the empirical formula and know a molar mass (molecular weight) for the compound, we can find the molecular formula. Stoichiometry © 2015 Pearson Education, Inc. ...
Chemistry Study Guide
... Coefficiant: the large number to the left of some of the chemical formulas indicates the number of that molecule in the equation. Ex: ...
... Coefficiant: the large number to the left of some of the chemical formulas indicates the number of that molecule in the equation. Ex: ...
File
... 2. ______________________ and ____________________ are in the nucleus of the atom and when added together they give you the ___________________________ of the atom. 3. _________________ move quickly and constantly around the outside of the nucleus in the ____________ __________. 4. The number of ___ ...
... 2. ______________________ and ____________________ are in the nucleus of the atom and when added together they give you the ___________________________ of the atom. 3. _________________ move quickly and constantly around the outside of the nucleus in the ____________ __________. 4. The number of ___ ...
Chemistry Final Exam Review 2006-2007
... 21. What is the hydrogen ion concentration of [OH-] = 3.0 x 10-2 M? What is the pH? 22. What is the pH of a solution if the [H+] = 3.4 x 10-5 M? What is the hydroxide concentration? 23. Determine the pH of a 2.0 x 10-2 M Sr(OH)2? 24. The pH of a solution is measured and determined to be 7.52? What i ...
... 21. What is the hydrogen ion concentration of [OH-] = 3.0 x 10-2 M? What is the pH? 22. What is the pH of a solution if the [H+] = 3.4 x 10-5 M? What is the hydroxide concentration? 23. Determine the pH of a 2.0 x 10-2 M Sr(OH)2? 24. The pH of a solution is measured and determined to be 7.52? What i ...
50 Frequently Forgotten Facts
... 21) At STP, the liquids on the Periodic Table are Br and Hg. The gases are N, Cl, H, O, F and the Noble Gases. All other elements are solids. [Periodic Table] a) Which element on the Periodic Table is a nonmetallic liquid at STP?____________________________ b) Which element at STP is a liquid that ...
... 21) At STP, the liquids on the Periodic Table are Br and Hg. The gases are N, Cl, H, O, F and the Noble Gases. All other elements are solids. [Periodic Table] a) Which element on the Periodic Table is a nonmetallic liquid at STP?____________________________ b) Which element at STP is a liquid that ...
Arts and Sciences Program Chemistry Department Chemistry Placement Test
... 17. If the reaction of 150. g of ammonia with 150. g of oxygen gas produces or (yields) 87. g of nitric oxide (NO), what is the percent yield of this reaction? 4NH3(g) + 5O2(g) 4NO(g) + 6H2O(g). ...
... 17. If the reaction of 150. g of ammonia with 150. g of oxygen gas produces or (yields) 87. g of nitric oxide (NO), what is the percent yield of this reaction? 4NH3(g) + 5O2(g) 4NO(g) + 6H2O(g). ...
Homework - PHA Science
... N2(g) + 3H2(g) 2NH3(g) How many moles of hydrogen gas are required to react with 15 moles of nitrogen gas? How many moles of hydrogen gas are required to produce 25.0 moles of ammonia gas? If 10 moles of nitrogen gas was reacted with 10 moles of hydrogen gas, which would be completely reacted? Whi ...
... N2(g) + 3H2(g) 2NH3(g) How many moles of hydrogen gas are required to react with 15 moles of nitrogen gas? How many moles of hydrogen gas are required to produce 25.0 moles of ammonia gas? If 10 moles of nitrogen gas was reacted with 10 moles of hydrogen gas, which would be completely reacted? Whi ...
Part II - American Chemical Society
... solution and emits a colorless gas which is found to be nitric oxide. Write a balanced equation for this reaction. b. The water is evaporated from the blue solution to leave a blue solid. When the blue solid is heated further, a second reaction occurs. This reaction produces a mixture of nitrogen di ...
... solution and emits a colorless gas which is found to be nitric oxide. Write a balanced equation for this reaction. b. The water is evaporated from the blue solution to leave a blue solid. When the blue solid is heated further, a second reaction occurs. This reaction produces a mixture of nitrogen di ...
FREQUENTLY FORGOTTEN FACTS
... 21) At STP, the liquids on the Periodic Table are Br and Hg. The gases are N, Cl, H, O, F and the Noble Gases. All other elements are solids. [Periodic Table] a) Which element on the Periodic Table is a nonmetallic liquid at STP?____________________________ b) Which element at STP is a liquid that ...
... 21) At STP, the liquids on the Periodic Table are Br and Hg. The gases are N, Cl, H, O, F and the Noble Gases. All other elements are solids. [Periodic Table] a) Which element on the Periodic Table is a nonmetallic liquid at STP?____________________________ b) Which element at STP is a liquid that ...
Honors Chemistry Exam Review Questions
... a single product an element and a compound two ionic compounds ...
... a single product an element and a compound two ionic compounds ...
Lab Stuff - WW-P 4
... Identify products, reactants, elements, symbols, coefficients, subscripts and compounds in the following equations: ...
... Identify products, reactants, elements, symbols, coefficients, subscripts and compounds in the following equations: ...
Stoich chem reactions practice Answer Section
... 1. Which observation does NOT indicate that a chemical reaction has occurred? a. formation of a precipitate c. evolution of heat and light b. production of a gas d. change in total mass of substances 2. In writing an equation that produces hydrogen gas, the correct representation of hydrogen gas is ...
... 1. Which observation does NOT indicate that a chemical reaction has occurred? a. formation of a precipitate c. evolution of heat and light b. production of a gas d. change in total mass of substances 2. In writing an equation that produces hydrogen gas, the correct representation of hydrogen gas is ...
kinetics and equilibrium
... • Ex. metal oxides, platinum • Works by adsorption – the adherence of one substance to the surface of another • Catalyst has specific lumps that hold the chemicals in the right position to react (increase the chance of them coming together) ...
... • Ex. metal oxides, platinum • Works by adsorption – the adherence of one substance to the surface of another • Catalyst has specific lumps that hold the chemicals in the right position to react (increase the chance of them coming together) ...
104 Homework Packet - Rogue Community College
... Methane reacts with oxygen to form carbon dioxide and water. How many grams of oxygen are required in order to react completely with 10.0 g methane? ...
... Methane reacts with oxygen to form carbon dioxide and water. How many grams of oxygen are required in order to react completely with 10.0 g methane? ...
Page | 1 MATS1101 Chemistry notes semester 2 2012 TOPIC 1
... reaction. Energy is neither created or destroyed in a chemical reaction, but it may be transformed from one form to another. In a chemical reaction the arrangement of the atoms is merely changed. 2. Law of Definite Composition: In chemical compounds, the various elements are always combined in defin ...
... reaction. Energy is neither created or destroyed in a chemical reaction, but it may be transformed from one form to another. In a chemical reaction the arrangement of the atoms is merely changed. 2. Law of Definite Composition: In chemical compounds, the various elements are always combined in defin ...
Density of solutions answers The concentration of solutions is often
... Use your textbook or a chemical encyclopedia to write a specific definition of the term salt. What does it mean to say that an ion becomes hydrated when a salt is dissolved in water? Pre-lab9 Define the following: a. Limiting reactant b. Stoichiometry Magnesium metal reacts with chlorine gas to prod ...
... Use your textbook or a chemical encyclopedia to write a specific definition of the term salt. What does it mean to say that an ion becomes hydrated when a salt is dissolved in water? Pre-lab9 Define the following: a. Limiting reactant b. Stoichiometry Magnesium metal reacts with chlorine gas to prod ...
Test review
... 11a. increase, shift left 11b. increase, shift left 11c no change 11d. increase, shift left 11e. decrease, shift right 12. 2 x 103 molecules/cm3 13. FeSCN2+ = 2.0 M, Fe3+ and SCN- = 0.043 M 14. 134 atm-1 15. 2.1 x 10-3 atm 16. PP4 = 0.73 atm, PP2 = 0.270 atm, 16% P4 is dissociated 17. PNO2 = .71 atm ...
... 11a. increase, shift left 11b. increase, shift left 11c no change 11d. increase, shift left 11e. decrease, shift right 12. 2 x 103 molecules/cm3 13. FeSCN2+ = 2.0 M, Fe3+ and SCN- = 0.043 M 14. 134 atm-1 15. 2.1 x 10-3 atm 16. PP4 = 0.73 atm, PP2 = 0.270 atm, 16% P4 is dissociated 17. PNO2 = .71 atm ...
Chemistry exam review
... 2.1.5 Explain the relationships among pressure, temperature, volume, and quantity of gas, both quantitative and qualitative. 1. What happens to the pressure of a constant mass of gas at constant temperature when the volume is doubled? a. The pressure is doubled. b. The pressure remains the same. c. ...
... 2.1.5 Explain the relationships among pressure, temperature, volume, and quantity of gas, both quantitative and qualitative. 1. What happens to the pressure of a constant mass of gas at constant temperature when the volume is doubled? a. The pressure is doubled. b. The pressure remains the same. c. ...
Tutorial 1
... 9. All Alkali metals react with water to produce hydrogen gas and the corresponding alkali metal hydroxide. A typical reaction is that between lithium and water. Li (s) + H2O(l) LiOH(aq) + H2(g) (not balanced) a. How many moles of H2 will be formed by the complete reaction of 6.23 moles of Li with ...
... 9. All Alkali metals react with water to produce hydrogen gas and the corresponding alkali metal hydroxide. A typical reaction is that between lithium and water. Li (s) + H2O(l) LiOH(aq) + H2(g) (not balanced) a. How many moles of H2 will be formed by the complete reaction of 6.23 moles of Li with ...
An Introduction to Matter
... – A physical change is a change that does not alter the identity of the matter. – A chemical change is a change that does alter the identity of the matter. – A compound is a pure substance that can be decomposed by a chemical change into simpler substances – An element is a pure substance which can ...
... – A physical change is a change that does not alter the identity of the matter. – A chemical change is a change that does alter the identity of the matter. – A compound is a pure substance that can be decomposed by a chemical change into simpler substances – An element is a pure substance which can ...
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.