Practice Test 3: Answer Key
... 1. The empirical formula of a compound is CH. The molar mass of this compound is 78.0, then the molecular formula is A) C2H2 B) C5H18 C) C6H6 ( 78.0/14=6)*** D) No correct answer given ...
... 1. The empirical formula of a compound is CH. The molar mass of this compound is 78.0, then the molecular formula is A) C2H2 B) C5H18 C) C6H6 ( 78.0/14=6)*** D) No correct answer given ...
ATOMS, MOLES AND STOICHIOMETRY
... Molar mass is the mass of one mole of a substance, it is the same as Mr except that Mr does NOT have units, molar mass has units of g mol-1 (grams per mole) Molar mass is the mass per mole of a substance Units are g mol-1 ...
... Molar mass is the mass of one mole of a substance, it is the same as Mr except that Mr does NOT have units, molar mass has units of g mol-1 (grams per mole) Molar mass is the mass per mole of a substance Units are g mol-1 ...
The Law of Definite Proportions
... KCl always contains one atom of K for every one atom of Cl In KCl, potassium and chlorine always have a ratio of “39.09 to 35.45” or “1.1 to 1” by mass. ...
... KCl always contains one atom of K for every one atom of Cl In KCl, potassium and chlorine always have a ratio of “39.09 to 35.45” or “1.1 to 1” by mass. ...
Chapter 3
... 62. Allicin is the compound responsible for the characteristic smell of garlic. An analysis of the compound gives the following percent composition by mass: C: 44.4 percent; H: 6.21 percent; S: 39.5 percent; O: 9.86 percent. What is its molecular formula given that its molar mass is about 162 g? A) ...
... 62. Allicin is the compound responsible for the characteristic smell of garlic. An analysis of the compound gives the following percent composition by mass: C: 44.4 percent; H: 6.21 percent; S: 39.5 percent; O: 9.86 percent. What is its molecular formula given that its molar mass is about 162 g? A) ...
Balancing Chemical Equations
... Scientists use chemical equations as a shorthand way to represent the reactions that occur between substances. Because of the law of conservation of matter, these equations must be balanced. In other words, the number of atoms of each element must be conserved. For example, look at the reaction of h ...
... Scientists use chemical equations as a shorthand way to represent the reactions that occur between substances. Because of the law of conservation of matter, these equations must be balanced. In other words, the number of atoms of each element must be conserved. For example, look at the reaction of h ...
ChemChpt 10 2014
... elements on both sides of the arrow, because mass can not be lost or gained in a reaction • don’t confuse subscripts with coefficients • subscripts determine the substance, coefficients tell us how much of that substance we have • we don’t change the subscripts, or we change the substance, rather we ...
... elements on both sides of the arrow, because mass can not be lost or gained in a reaction • don’t confuse subscripts with coefficients • subscripts determine the substance, coefficients tell us how much of that substance we have • we don’t change the subscripts, or we change the substance, rather we ...
PAP Chemistry - Fall Final Review
... 8. Use the mass number and atomic number to determine the element and its number of protons, electrons, and neutrons 9. Be able to determine the atomic number and mass number of an element when the number of protons, neutrons, and electrons is specified 10. How does mass number relate to number of p ...
... 8. Use the mass number and atomic number to determine the element and its number of protons, electrons, and neutrons 9. Be able to determine the atomic number and mass number of an element when the number of protons, neutrons, and electrons is specified 10. How does mass number relate to number of p ...
References - WordPress.com
... o carry out procedures, controlling the major variables and adapting or extending procedures (e.g., when performing an experiment to illustrate conservation of mass, demonstrate an understanding of closed and open systems and control for loss or gain of matter during a chemical change) [Will be asse ...
... o carry out procedures, controlling the major variables and adapting or extending procedures (e.g., when performing an experiment to illustrate conservation of mass, demonstrate an understanding of closed and open systems and control for loss or gain of matter during a chemical change) [Will be asse ...
Ionic bonding - Nidderdale High School
... What is the mass number of this chlorine atom? What is the atomic number of this chlorine atom? How many protons neutrons and electrons does this chlorine atom have? 4. What is the electron configuration of a chlorine atom? 5. What is the relative mass of an electron? 6. What is the charge on a neut ...
... What is the mass number of this chlorine atom? What is the atomic number of this chlorine atom? How many protons neutrons and electrons does this chlorine atom have? 4. What is the electron configuration of a chlorine atom? 5. What is the relative mass of an electron? 6. What is the charge on a neut ...
Chapter 3
... What are the reactants, the products, and the physical states involved? 2. Write the unbalanced equation that summarizes the reaction described in step 1. 3. Balance the equation by inspection, starting with the most complicated molecule(s). The same number of each type of atom needs to appear on bo ...
... What are the reactants, the products, and the physical states involved? 2. Write the unbalanced equation that summarizes the reaction described in step 1. 3. Balance the equation by inspection, starting with the most complicated molecule(s). The same number of each type of atom needs to appear on bo ...
THE GENERAL LAW OF CHEMICAL KINETICS, DOES IT EXIST?
... In 1879, a vivid interpretation of complex systems as mechanical systems was given by Maxwell. “In an ordinary chime every bell has a rope that is drawn through a hole in the floor into the bell-ringer room. But let us imagine that every rope instead of putting into motion one bell participates in t ...
... In 1879, a vivid interpretation of complex systems as mechanical systems was given by Maxwell. “In an ordinary chime every bell has a rope that is drawn through a hole in the floor into the bell-ringer room. But let us imagine that every rope instead of putting into motion one bell participates in t ...
Chapter 3 Stoichiometry
... 2. Mass Relationship with equations a. Mole-mole relationship 1. The coefficients indicate how many moles of one reactant are required to combine with another reactant. They also show how many moles of product are obtained. 2. These coefficients can be used as conversion factors for the particular ...
... 2. Mass Relationship with equations a. Mole-mole relationship 1. The coefficients indicate how many moles of one reactant are required to combine with another reactant. They also show how many moles of product are obtained. 2. These coefficients can be used as conversion factors for the particular ...
Activity 17 Follow-up
... neutrons, but always has the same number of protons •The atomic weight is the average weight of all the known isotopes of the element •The element which appears on the periodic table is the isotope which is most abundant ...
... neutrons, but always has the same number of protons •The atomic weight is the average weight of all the known isotopes of the element •The element which appears on the periodic table is the isotope which is most abundant ...
Chemical Reactions Q3U3
... The solubility of GASES always decreases with increased temperature The amount of increase or decrease depends on the individual solutes ...
... The solubility of GASES always decreases with increased temperature The amount of increase or decrease depends on the individual solutes ...
Differential Equations of Gas-Phase Chemical Kinetics
... Here Yn is mass fraction and mn is molecular weight of the nth species, wjn is molar production rate of species n in the jth reaction (Eq (3.5)), wn is the total molar production rate of the nth species. Sum is over reactions that involve the nth species. Thus, the left-hand side of Eq (4.2) is time ...
... Here Yn is mass fraction and mn is molecular weight of the nth species, wjn is molar production rate of species n in the jth reaction (Eq (3.5)), wn is the total molar production rate of the nth species. Sum is over reactions that involve the nth species. Thus, the left-hand side of Eq (4.2) is time ...
Chapter 8 Thermochemistry: Chemical Energy
... motion (translational, rotational, and vibrational) ...
... motion (translational, rotational, and vibrational) ...
New substances are formed by chemical reactions. When elements
... a unit of Fe(OH)3 contains one iron atom, three oxygen atoms and three hydrogen atoms - the brackets show that the 3 applies to O and H ...
... a unit of Fe(OH)3 contains one iron atom, three oxygen atoms and three hydrogen atoms - the brackets show that the 3 applies to O and H ...
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.