- Catalyst
... D) 8.8 x 10-4 mol E) none of the above 14. What is the mass % of H in ammonium phosphate ((NH4)3PO3? A) 2.3% B) 6.0% C) 9.1% D) 17% E) none of the above 15. Naturally occurring rubidium has an atomic mass of 85.5amu. It is composed of two isotopes, rubidium–85 (84.9amu) and rubidium–87 (86.9amu). Fr ...
... D) 8.8 x 10-4 mol E) none of the above 14. What is the mass % of H in ammonium phosphate ((NH4)3PO3? A) 2.3% B) 6.0% C) 9.1% D) 17% E) none of the above 15. Naturally occurring rubidium has an atomic mass of 85.5amu. It is composed of two isotopes, rubidium–85 (84.9amu) and rubidium–87 (86.9amu). Fr ...
chemical reactions
... phenylalanine from the diet. Phenylalanine is commonly found in protein-containing foods such as meat. Babies who are diagnosed with PKU must immediately be put on a special milk/formula substitute. Later in life, the diet is mainly vegetarian. ...
... phenylalanine from the diet. Phenylalanine is commonly found in protein-containing foods such as meat. Babies who are diagnosed with PKU must immediately be put on a special milk/formula substitute. Later in life, the diet is mainly vegetarian. ...
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? ...
Scanning Electron Microscopy / Electron Probe X
... electron of the sample. This excited electron then leaves the sample with a very small kinetic energy. Due to this low energy, only SE’s that are created near the surface can exit the sample and can be detected. Any variation in topography of the surface will change the yield of SE’s. This yield dep ...
... electron of the sample. This excited electron then leaves the sample with a very small kinetic energy. Due to this low energy, only SE’s that are created near the surface can exit the sample and can be detected. Any variation in topography of the surface will change the yield of SE’s. This yield dep ...
chemical reaction
... need a “little help” to get started. • You may need to add • _________ (Lighting a candle) or • __________ (Diesel engine) • Start a reaction ...
... need a “little help” to get started. • You may need to add • _________ (Lighting a candle) or • __________ (Diesel engine) • Start a reaction ...
Lab Stuff:
... 2. The number of electrons gained or lost can be predicted with an understanding of the octet rule and the number of valence electrons an atom contains. 3. The periodic table is organized by electron configuration, and elements are classified as metals, nonmetals or metalloids based on physical and ...
... 2. The number of electrons gained or lost can be predicted with an understanding of the octet rule and the number of valence electrons an atom contains. 3. The periodic table is organized by electron configuration, and elements are classified as metals, nonmetals or metalloids based on physical and ...
MATTER-Ch. 3-homogeneous vs. heterogeneous, elements
... The law of conservation of mass follows from the concept that a. atoms are indivisible. b. atoms of different elements have different properties. c. matter is composed of atoms. d. atoms can be destroyed in chemical reactions. ____ 16. In oxides of nitrogen, such as N2O, NO, NO2, and N2O3, atoms com ...
... The law of conservation of mass follows from the concept that a. atoms are indivisible. b. atoms of different elements have different properties. c. matter is composed of atoms. d. atoms can be destroyed in chemical reactions. ____ 16. In oxides of nitrogen, such as N2O, NO, NO2, and N2O3, atoms com ...
Lab Stuff
... 2. The number of electrons gained or lost can be predicted with an understanding of the octet rule and the number of valence electrons an atom contains. 3. The periodic table is organized by electron configuration, and elements are classified as metals, nonmetals or metalloids based on physical and ...
... 2. The number of electrons gained or lost can be predicted with an understanding of the octet rule and the number of valence electrons an atom contains. 3. The periodic table is organized by electron configuration, and elements are classified as metals, nonmetals or metalloids based on physical and ...
CHEM 1211 and CHEM 1212 National ACS Exams About the Exam
... formulas and techniques. Rather, it is a coherent set of knowledge that enables comprehension of the submicroscopic (chemical) world. As such, the ACS tests seek to uncover such genuine understanding. CHEM 1211 Example Questions There is an emphasis on conceptual questions. The actual exam wi ...
... formulas and techniques. Rather, it is a coherent set of knowledge that enables comprehension of the submicroscopic (chemical) world. As such, the ACS tests seek to uncover such genuine understanding. CHEM 1211 Example Questions There is an emphasis on conceptual questions. The actual exam wi ...
Chemical Reaction
... Beginning & ending substances have different properties Atoms are rearranged, chemical bonds are broken and new bonds are formed All reactions involve energy changes ...
... Beginning & ending substances have different properties Atoms are rearranged, chemical bonds are broken and new bonds are formed All reactions involve energy changes ...
2007 - SAASTA
... The answers have been compiled from a variety of sources, mainly Wikipedia (the free online encyclopaedia), Encyclopaedia Britannica, the Kirk-Othmer Encylopaedia of Chemical Technology and a variety of chemistry textbooks. ...
... The answers have been compiled from a variety of sources, mainly Wikipedia (the free online encyclopaedia), Encyclopaedia Britannica, the Kirk-Othmer Encylopaedia of Chemical Technology and a variety of chemistry textbooks. ...
Tutorial 1
... 1. Use the second member of each group from Group 1A to Group 7A to show that the number of valance electrons on an atom of the element is the same as its group number. 2. Use Lewis dot symbol to show the formation of aluminum oxide (Al 2O3) 3. Explain what an ionic bond is? And name five metals and ...
... 1. Use the second member of each group from Group 1A to Group 7A to show that the number of valance electrons on an atom of the element is the same as its group number. 2. Use Lewis dot symbol to show the formation of aluminum oxide (Al 2O3) 3. Explain what an ionic bond is? And name five metals and ...
Honors Unit 5 Practice Test
... a. oxygen. c. chlorine. b. sodium. d. fluorine. A negative ion is known as a(n) a. ionic radius. c. cation. b. valence electron. d. anion. In a row in the periodic table, as the atomic number increases, the atomic radius generally a. decreases. c. increases. b. remains constant. d. becomes immeasura ...
... a. oxygen. c. chlorine. b. sodium. d. fluorine. A negative ion is known as a(n) a. ionic radius. c. cation. b. valence electron. d. anion. In a row in the periodic table, as the atomic number increases, the atomic radius generally a. decreases. c. increases. b. remains constant. d. becomes immeasura ...
chapter_2_2009
... – There are two types of energy: – Potential energy Stored energy, available to do work – Kinetic energy Energy of motion – Potential energy can be converted to kinetic energy to do work. – A basic understanding of chemistry will help you to ...
... – There are two types of energy: – Potential energy Stored energy, available to do work – Kinetic energy Energy of motion – Potential energy can be converted to kinetic energy to do work. – A basic understanding of chemistry will help you to ...
1st Olympiad of Metropolises Chemistry Theoretical Problems
... under heating of furan with ammonia (amines) above 400 C in the presence of alumina. In a laboratory, the sequence of furan hydrolysis followed by Paal-Knorr reaction with ammonia (amine) is used for this transformation. This sequence can be realized as a two-step procedure or as a domino reaction. ...
... under heating of furan with ammonia (amines) above 400 C in the presence of alumina. In a laboratory, the sequence of furan hydrolysis followed by Paal-Knorr reaction with ammonia (amine) is used for this transformation. This sequence can be realized as a two-step procedure or as a domino reaction. ...
(the products). Mass is conserved in a chemical reaction
... which states that molecules must collide in order to react. • Collisions must also be effective, which means that they must have sufficient energy for a reaction to occur. ...
... which states that molecules must collide in order to react. • Collisions must also be effective, which means that they must have sufficient energy for a reaction to occur. ...
periodic table - Mesa Community College
... DISCUSSION: After the names and symbols of the elements are mastered, we can now move to the second task: assembling these symbols and names and learning how to write formulas and name compounds. Compounds are defined as pure substances that can be broken down to simpler pure substances by a chemica ...
... DISCUSSION: After the names and symbols of the elements are mastered, we can now move to the second task: assembling these symbols and names and learning how to write formulas and name compounds. Compounds are defined as pure substances that can be broken down to simpler pure substances by a chemica ...
The production and use of metals
... Most metals are found as metal oxides. To extract them the oxygen must be removed. A REDUCTION reaction is one in which oxygen is removed/lost. Watch the two teacher demos of reduction reactions. Write down word equations for both of them, N.B. both of these reactions can also be described as displa ...
... Most metals are found as metal oxides. To extract them the oxygen must be removed. A REDUCTION reaction is one in which oxygen is removed/lost. Watch the two teacher demos of reduction reactions. Write down word equations for both of them, N.B. both of these reactions can also be described as displa ...
Chemical Reactions and Stoichiometry
... iii. Pressure - written above the arrow (units = kPa, mmHg, atm) iv. States of Matter (s) solid (l) liquid (g) gas (aq) aqueous – dissolved in water Balancing Equations a. Skeletal Equations - does not indicate the relative amounts of the reactants and products – not balanced - uses element symbols ...
... iii. Pressure - written above the arrow (units = kPa, mmHg, atm) iv. States of Matter (s) solid (l) liquid (g) gas (aq) aqueous – dissolved in water Balancing Equations a. Skeletal Equations - does not indicate the relative amounts of the reactants and products – not balanced - uses element symbols ...
Elements Combine to Form Compounds
... one kind of element in which the atoms of the elements are joined together. Compounds form through chemical bonds: these are links between two or more atoms that hold the atoms together Two types of Compounds (chemical bonds) Ionic Compounds Molecular (covalent) Compounds ...
... one kind of element in which the atoms of the elements are joined together. Compounds form through chemical bonds: these are links between two or more atoms that hold the atoms together Two types of Compounds (chemical bonds) Ionic Compounds Molecular (covalent) Compounds ...
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.