Practice MSL Multiple Choice 1. Compared to the charge and mass
... The sign of H is positive, and the products have less potential energy than the reactants. The sign of H is positive, and the products have more potential energy than the reactants. The sign of H is negative, and the products have less potential energy than the reactants. The sign of H is negative, ...
... The sign of H is positive, and the products have less potential energy than the reactants. The sign of H is positive, and the products have more potential energy than the reactants. The sign of H is negative, and the products have less potential energy than the reactants. The sign of H is negative, ...
2.4 Chemical Reactions
... 2. Describe how the interaction between an enzyme and its substrate changes a chemical reaction. 4. Suppose that the amino acids that make up an enzyme’s active site are changed. How might this change affect the enzyme? ...
... 2. Describe how the interaction between an enzyme and its substrate changes a chemical reaction. 4. Suppose that the amino acids that make up an enzyme’s active site are changed. How might this change affect the enzyme? ...
2016
... mole percent, 10.0% O2, 10.0% N2 , and 80.0% He. a.Calculate the molar mass of this mixture. b.What is the ratio of the density of this gas to that of pure Oxygen? 57.A 2.0g sample of SX6 (g) has a volume of 329.5 cm3 at 1.00 atm and 20oC. Identify the element ‘X’. Name the compound. 58.When Hydroge ...
... mole percent, 10.0% O2, 10.0% N2 , and 80.0% He. a.Calculate the molar mass of this mixture. b.What is the ratio of the density of this gas to that of pure Oxygen? 57.A 2.0g sample of SX6 (g) has a volume of 329.5 cm3 at 1.00 atm and 20oC. Identify the element ‘X’. Name the compound. 58.When Hydroge ...
Unit 2 Review Questions Fill in the blank In a(n) change, a new
... A Bohr diagram shows electrons in orbits about the nucleus. m. A row of the periodic table is called a period. n. The size of atoms increase down a column of the periodic table. o. Alkali metals include fluorine, chlorine, and iodine. p. The modern periodic table organizes elements by atomic mass. 3 ...
... A Bohr diagram shows electrons in orbits about the nucleus. m. A row of the periodic table is called a period. n. The size of atoms increase down a column of the periodic table. o. Alkali metals include fluorine, chlorine, and iodine. p. The modern periodic table organizes elements by atomic mass. 3 ...
Chem152
... B) atomic number C) atomic mass D) mass number E) none of the above 9. How many neutrons are in the nucleus of an atom of silver-107? A) 47 B) 60 C) 107 D) 154 E) none of the above 10. What is the term for an atom (or group of atoms) that bears a charge as the result of gaining or losing valence ele ...
... B) atomic number C) atomic mass D) mass number E) none of the above 9. How many neutrons are in the nucleus of an atom of silver-107? A) 47 B) 60 C) 107 D) 154 E) none of the above 10. What is the term for an atom (or group of atoms) that bears a charge as the result of gaining or losing valence ele ...
9182747 Chemistry Ja02
... that can be placed in a container of the same size at STP? (1) 1.0 mole (3) 3.0 moles (2) 1.5 moles (4) 0.0 moles 31 According to Reference Table G, how many grams of KNO3 would be needed to saturate 200 grams of water at 70°C? (1) 43 g (3) 134 g (2) 86 g (4) 268 g ...
... that can be placed in a container of the same size at STP? (1) 1.0 mole (3) 3.0 moles (2) 1.5 moles (4) 0.0 moles 31 According to Reference Table G, how many grams of KNO3 would be needed to saturate 200 grams of water at 70°C? (1) 43 g (3) 134 g (2) 86 g (4) 268 g ...
Unit 1 Notes (general chem review)
... solid – the particles are very closely spaced – well aligned liquid – the particles are fairly close, but not well aligned gas – the particles are very spread out – large space between them Vapor – the term for a substance in the gas phase that is normally in a different phase at room condit ...
... solid – the particles are very closely spaced – well aligned liquid – the particles are fairly close, but not well aligned gas – the particles are very spread out – large space between them Vapor – the term for a substance in the gas phase that is normally in a different phase at room condit ...
Science Notes on Physical and Chemical Properties
... The appearance may change, but you still have the same substance as before – can be reversed and no energy is produced Example – Tear a piece of paper into 10-15 pieces. The shape and size have changed, but its still paper Example – Change of state = physical change…add energy to ice and you get a l ...
... The appearance may change, but you still have the same substance as before – can be reversed and no energy is produced Example – Tear a piece of paper into 10-15 pieces. The shape and size have changed, but its still paper Example – Change of state = physical change…add energy to ice and you get a l ...
chapter 13 - Humble ISD
... We replace NaOH with X and H3PO4 with Y we get: 3X=Y Let’s look at the equation now: Keq = [0.200] ...
... We replace NaOH with X and H3PO4 with Y we get: 3X=Y Let’s look at the equation now: Keq = [0.200] ...
1. Bromine exists naturally as a mixture of bromine
... and X-30 (29.974 amu, 3.09% abundance). Calculate the atomic weight of X. A) 28.1 amu B) 54.0 amu C) 29 amu D) 72.7 amu E) 36.2 amu ...
... and X-30 (29.974 amu, 3.09% abundance). Calculate the atomic weight of X. A) 28.1 amu B) 54.0 amu C) 29 amu D) 72.7 amu E) 36.2 amu ...
Single Replacement Reactions
... with excess water and inform the instructor. Wear safety goggles and closed toed shoes throughout the entirety of the lab procedure.*** b. Label five test tubes - each with the name of one of the metals (zinc, aluminum, copper, iron and magnesium) if this has not been done already. c. Following your ...
... with excess water and inform the instructor. Wear safety goggles and closed toed shoes throughout the entirety of the lab procedure.*** b. Label five test tubes - each with the name of one of the metals (zinc, aluminum, copper, iron and magnesium) if this has not been done already. c. Following your ...
AHSGE Review
... What are the characteristics of chemical changes? Chemical changes have specific properties. You can tell a chemical change has ...
... What are the characteristics of chemical changes? Chemical changes have specific properties. You can tell a chemical change has ...
Chemistry Syllabus
... Single displacement, double displacement, synthesis (combination), decomposition, disproportionation, combustion, or precipitation Products (given reactants) or reactants (given products) for each reaction type Solubility rules for precipitation reactions and the activity series for single and ...
... Single displacement, double displacement, synthesis (combination), decomposition, disproportionation, combustion, or precipitation Products (given reactants) or reactants (given products) for each reaction type Solubility rules for precipitation reactions and the activity series for single and ...
Chemistry Syllabus - Madison County Schools
... Single displacement, double displacement, synthesis (combination), decomposition, disproportionation, combustion, or precipitation Products (given reactants) or reactants (given products) for each reaction type Solubility rules for precipitation reactions and the activity series for single and ...
... Single displacement, double displacement, synthesis (combination), decomposition, disproportionation, combustion, or precipitation Products (given reactants) or reactants (given products) for each reaction type Solubility rules for precipitation reactions and the activity series for single and ...
Microbial Metabolism
... Modes of E Conservation-ATP • Fermentation: in which redox reaction ocurs WITHOUT a terminal electron acceptor (couple oxiation with subsequent reduction of an organic ...
... Modes of E Conservation-ATP • Fermentation: in which redox reaction ocurs WITHOUT a terminal electron acceptor (couple oxiation with subsequent reduction of an organic ...
Chapter 7 Review
... For the reaction CO(g) + 2 H2(g) <---> CH3OH(g) + heat; [CO(g)] = 0.025 mol/L, [H2(g) ] = 0.050 mol/L and [CH3OH(g)] = 0.0063 mol/L a) b) ...
... For the reaction CO(g) + 2 H2(g) <---> CH3OH(g) + heat; [CO(g)] = 0.025 mol/L, [H2(g) ] = 0.050 mol/L and [CH3OH(g)] = 0.0063 mol/L a) b) ...
Chemistry Lab 2010
... In a titration a solution of accurately known concentration is added gradually added to another solution of unknown concentration until the chemical reaction between the two solutions is complete. Indicator – substance that changes color at (or near) the equivalence point Equivalence point – the poi ...
... In a titration a solution of accurately known concentration is added gradually added to another solution of unknown concentration until the chemical reaction between the two solutions is complete. Indicator – substance that changes color at (or near) the equivalence point Equivalence point – the poi ...
EXAM REVIEW !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! The examination is scheduled
... reversible process, but is it applicable to any process within the restrictions of its derivation? What are the best (natural) thermodynamic variables for U? Be able to show how more Thermodynamic information comes from the definition of the exact differential and the exactness criterion. What are ...
... reversible process, but is it applicable to any process within the restrictions of its derivation? What are the best (natural) thermodynamic variables for U? Be able to show how more Thermodynamic information comes from the definition of the exact differential and the exactness criterion. What are ...
Lecture 5 (2.1-2.3)
... Mass fraction of H = 1.0/9.0 = 0.11 (or 11%) Mass fraction of O = 8.0/9.0 = 0.89 (or 89%) Mass of element = Mass of compound × Mass fraction ...
... Mass fraction of H = 1.0/9.0 = 0.11 (or 11%) Mass fraction of O = 8.0/9.0 = 0.89 (or 89%) Mass of element = Mass of compound × Mass fraction ...
Answers to practice questions
... B) single replacement C) double replacement D) synthesis E) decomposition Al2(SO4)3(aq) + 6 NaOH(aq) 3 Na2SO4(aq) + 2 Al(OH)3(s) 115. If 2.0 moles of aluminum sulfate are to be reacted, how many moles of aluminum hydroxide will be formed? 4 moles 116. What is the molar mass of aluminum hydroxide? ...
... B) single replacement C) double replacement D) synthesis E) decomposition Al2(SO4)3(aq) + 6 NaOH(aq) 3 Na2SO4(aq) + 2 Al(OH)3(s) 115. If 2.0 moles of aluminum sulfate are to be reacted, how many moles of aluminum hydroxide will be formed? 4 moles 116. What is the molar mass of aluminum hydroxide? ...
Stoichiometry: Calculations with Chemical
... • If the combustion is complete, the products will be CO2 and H2O. • If the combustion is incomplete, the products will be CO and H2O. ...
... • If the combustion is complete, the products will be CO2 and H2O. • If the combustion is incomplete, the products will be CO and H2O. ...
(null): 110.ReactionsIntro
... test tube plus a few ml of HCl. While bubbling discuss where energy is stored and where it goes 4) Return to reaction, have Ss feel test tube (warm!) & decide if reaction followed Option 1 or 2 d. “Re-arrange” collisions 1) All reactions require a certain number of collisions between molecules and a ...
... test tube plus a few ml of HCl. While bubbling discuss where energy is stored and where it goes 4) Return to reaction, have Ss feel test tube (warm!) & decide if reaction followed Option 1 or 2 d. “Re-arrange” collisions 1) All reactions require a certain number of collisions between molecules and a ...
Practice Multiple Choice Questions for the Chemistry Final Exam
... 81. Pressure and volume changes at a constant temperature can be calculated using a) Boyle's law. b) Charles's law. c) Kelvin’s law. d) Dalton's law. 83. The volume of a gas is 5.0 L when the temperature is 5.0 C. If the temperature is increased to 10.0 C without changing the pressure, what is the ...
... 81. Pressure and volume changes at a constant temperature can be calculated using a) Boyle's law. b) Charles's law. c) Kelvin’s law. d) Dalton's law. 83. The volume of a gas is 5.0 L when the temperature is 5.0 C. If the temperature is increased to 10.0 C without changing the pressure, what is the ...
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.