![Common Student Misconceptions](http://s1.studyres.com/store/data/013021573_1-9bffa5488320215ba49d57529587e70b-300x300.png)
Common Student Misconceptions
... • Compounds containing NO3– or C2H3O2– are soluble. • Compounds containing Cl–, Br– or I– are soluble. • Exceptions: Compounds of Ag+, Hg22+, and Pb2+. • Compounds containing SO42– are soluble. • Exceptions: Compounds of Sr2+, Ba2+, Hg22+, and Pb2+ • Compounds containing S2– are insoluble. • Excepti ...
... • Compounds containing NO3– or C2H3O2– are soluble. • Compounds containing Cl–, Br– or I– are soluble. • Exceptions: Compounds of Ag+, Hg22+, and Pb2+. • Compounds containing SO42– are soluble. • Exceptions: Compounds of Sr2+, Ba2+, Hg22+, and Pb2+ • Compounds containing S2– are insoluble. • Excepti ...
aq - Byron High School
... the (aq) designations remind us, CaCl2 , Na2CO3, and NaCl are all dissolved in the solution and are all strong electrolytes. CaCO3 is an ionic compound, but it is not soluble (rule #5). We do not write the formula of any insoluble compound as its component ions. Thus, the complete ionic equation is ...
... the (aq) designations remind us, CaCl2 , Na2CO3, and NaCl are all dissolved in the solution and are all strong electrolytes. CaCO3 is an ionic compound, but it is not soluble (rule #5). We do not write the formula of any insoluble compound as its component ions. Thus, the complete ionic equation is ...
Chapter 4
... that a specific chemical compound obtained from any source always contains the same proportion by mass of its elements • H+ + OH- ---> H2O • 2 H2 + O2 ---> 2 H2O ...
... that a specific chemical compound obtained from any source always contains the same proportion by mass of its elements • H+ + OH- ---> H2O • 2 H2 + O2 ---> 2 H2O ...
Chemical properties Chemical properties can be recognized only
... Chemical properties Chemical properties can be recognized only when substances react or do not react chemically with one another, that is, when they undergo a change in composition. The following chemical properties can be used to help identify a substance: Ability to burn The ability to burn involv ...
... Chemical properties Chemical properties can be recognized only when substances react or do not react chemically with one another, that is, when they undergo a change in composition. The following chemical properties can be used to help identify a substance: Ability to burn The ability to burn involv ...
Electron
... • Potential energy is the energy that matter has because of its location or structure • The electrons of an atom differ in their amounts of potential energy • An electron’s state of potential energy is called its energy level, or electron shell ...
... • Potential energy is the energy that matter has because of its location or structure • The electrons of an atom differ in their amounts of potential energy • An electron’s state of potential energy is called its energy level, or electron shell ...
3.091 – Introduction to Solid State Chemistry Lecture Notes No
... between these two extremes. (Two additional types of bonding, metallic bonding and Van der Waals bonding, will be discussed later.) Before discussing these models in detail it is appropriate to consider the relationships between the electronic structures of atoms and their chemical reactivity. The i ...
... between these two extremes. (Two additional types of bonding, metallic bonding and Van der Waals bonding, will be discussed later.) Before discussing these models in detail it is appropriate to consider the relationships between the electronic structures of atoms and their chemical reactivity. The i ...
Chapter 3
... Write the balanced chemical reaction? Calculate the molar mass of CH4S? Calculate the molar mass of H2O? Calculate the molar mass of O2? Calculate the theoretical yield of H2O? What is the limiting reagent? Calculate the percent yield of H2O? ...
... Write the balanced chemical reaction? Calculate the molar mass of CH4S? Calculate the molar mass of H2O? Calculate the molar mass of O2? Calculate the theoretical yield of H2O? What is the limiting reagent? Calculate the percent yield of H2O? ...
GCSE - WordPress.com
... 4. Explain the following in terms of bonding and structure ideas :. (i) Silicon dioxide and carbon dioxide both contain covalent bonds but the former melts at 1700oC whereas the latter is a gas at 0oC. (ii) Sodium oxide, carbon dioxide and silicon dioxide are all poor conductors of electricity ...
... 4. Explain the following in terms of bonding and structure ideas :. (i) Silicon dioxide and carbon dioxide both contain covalent bonds but the former melts at 1700oC whereas the latter is a gas at 0oC. (ii) Sodium oxide, carbon dioxide and silicon dioxide are all poor conductors of electricity ...
Le Chatelier`s Principle Notes
... Let's remove SCN- from the system (perhaps by adding some Pb2+ ions - the lead(II) ions will form a precipitate with SCN- , removing them from the solution). What will happen now? Equilibrium will shift to replace SCN- - the reverse reaction will be favoured because that is the direction that produc ...
... Let's remove SCN- from the system (perhaps by adding some Pb2+ ions - the lead(II) ions will form a precipitate with SCN- , removing them from the solution). What will happen now? Equilibrium will shift to replace SCN- - the reverse reaction will be favoured because that is the direction that produc ...
lectures on subjects in physics, chemistry and biology
... pressure it is found that the current is carried by electrons moving in one direction and positively charged atoms moving in the opposite direction. T h e stream of positively charged atoms can be allowed to pass through a hole in the negative electrode and so may be separated from the stream of ele ...
... pressure it is found that the current is carried by electrons moving in one direction and positively charged atoms moving in the opposite direction. T h e stream of positively charged atoms can be allowed to pass through a hole in the negative electrode and so may be separated from the stream of ele ...
Chemistry IGCSE
... Often it does not matter if a substance is not pure. We wash in tap water; without thinking too much about what is in it, but sometimes purity is very important. If you are making a new medical drug, or a flavouring for food, you must make sure it contains nothing that could harm people. An unwanted ...
... Often it does not matter if a substance is not pure. We wash in tap water; without thinking too much about what is in it, but sometimes purity is very important. If you are making a new medical drug, or a flavouring for food, you must make sure it contains nothing that could harm people. An unwanted ...
Indian Journal of Chemistry
... + H2O medium. The formation of the monothiocyanato complex, Fe(L)(OH2)(NCS), is reversible. The monosulphito complex, Fe(L)(OH2)(SO3)- is formed via the reaction of the diaqua complex with HSO3- and SO32-; dissociation of the sulphito complex to the reactants has not been observed. Ion-pairing of th ...
... + H2O medium. The formation of the monothiocyanato complex, Fe(L)(OH2)(NCS), is reversible. The monosulphito complex, Fe(L)(OH2)(SO3)- is formed via the reaction of the diaqua complex with HSO3- and SO32-; dissociation of the sulphito complex to the reactants has not been observed. Ion-pairing of th ...
In 1869, Russia`s Dmitri Mendeleev and Germany`s Lothar Meyer
... 2. A whole number representing the atomic number. Normal atoms have an equal number of protons and electrons - so, the atomic number is also equal to the electrons in an atom. ...
... 2. A whole number representing the atomic number. Normal atoms have an equal number of protons and electrons - so, the atomic number is also equal to the electrons in an atom. ...
Fe(H2O)63+ + H2O → ← H3O+ + Fe(H2O)5(OH)2+
... 66. Consider the equation: 2 NaI(aq) + Cl2(g) ÆI2 (aq) + 2 NaCl(aq) The element undergoing reduction is (A) (B) (C) (D) ...
... 66. Consider the equation: 2 NaI(aq) + Cl2(g) ÆI2 (aq) + 2 NaCl(aq) The element undergoing reduction is (A) (B) (C) (D) ...
PDF (Size: 41K)
... Explain, with reference to the standard electrode potential for sodium and hydrogen, why sodium is manufactured using this method rather than by the electrolysis of aqueous sodium chloride. Na+(aq) + e– ...
... Explain, with reference to the standard electrode potential for sodium and hydrogen, why sodium is manufactured using this method rather than by the electrolysis of aqueous sodium chloride. Na+(aq) + e– ...
Chapter 8
... move up the table starting with gold (Au) and ending with potassium (K) the activity increases. The same is true as you move up from iodine (I2) to fluorine (F2). The table is useful for predicting the products of some reactions because an element in the series will replace any element given below i ...
... move up the table starting with gold (Au) and ending with potassium (K) the activity increases. The same is true as you move up from iodine (I2) to fluorine (F2). The table is useful for predicting the products of some reactions because an element in the series will replace any element given below i ...
Chemical Reactions of Copper and Percent Recovery
... losing any in the process. In today’s lab, a rare use of Equation 15 occurs. Since we are starting and ending with the same pure substance (elemental copper), the theoretical mass is the starting mass. In most reactions, the theoretical mass is calculated by converting the mass (in grams) of Substan ...
... losing any in the process. In today’s lab, a rare use of Equation 15 occurs. Since we are starting and ending with the same pure substance (elemental copper), the theoretical mass is the starting mass. In most reactions, the theoretical mass is calculated by converting the mass (in grams) of Substan ...
2011-2012 Paper 1
... 6. Chlorine has a relative atomic mass of 35.5 and has two isotopes with relative isotopic masses of 35 and 37. Which of the following statements about chlorine are CORRECT? (1) The isotopes have same atomic number. (2) It contains the two isotopes, chlorine-35 and chlorine-37, in a ratio of 1:3. (3 ...
... 6. Chlorine has a relative atomic mass of 35.5 and has two isotopes with relative isotopic masses of 35 and 37. Which of the following statements about chlorine are CORRECT? (1) The isotopes have same atomic number. (2) It contains the two isotopes, chlorine-35 and chlorine-37, in a ratio of 1:3. (3 ...
North Carolina Test of Chemistry RELEASED
... saturated solution in 100 g of water at different temperatures. The student’s data are shown in the table below the graph. ...
... saturated solution in 100 g of water at different temperatures. The student’s data are shown in the table below the graph. ...
CLASSES AND NOMENCLATURE OF INORGANIC COMPOUNDS
... D 16 times D increase of the pressure E 6 times E decrease of the temperature 9. Speed of what reactions increases if the 10. The law of mass action describes the temperature is increased? dependence of rate of chemical reaction on: A endothermic A the concentration of reactans B exothermic B areas ...
... D 16 times D increase of the pressure E 6 times E decrease of the temperature 9. Speed of what reactions increases if the 10. The law of mass action describes the temperature is increased? dependence of rate of chemical reaction on: A endothermic A the concentration of reactans B exothermic B areas ...
File
... composition. Most minerals form under conditions of high pressure and temperature deep within the crust or even in the mantle. If the minerals reach Earth’s surface where pressure and temperature are much lower, they become unstable. As a result, the minerals change chemically to other minerals, suc ...
... composition. Most minerals form under conditions of high pressure and temperature deep within the crust or even in the mantle. If the minerals reach Earth’s surface where pressure and temperature are much lower, they become unstable. As a result, the minerals change chemically to other minerals, suc ...
Answers - U of L Class Index
... We could use mass spectrometry (MS). This would give the exact mass of each isotope present in the sample and the relative amount of each isotope present in the sample (wchich allows calculation of percent abundance for each isotope). From this information, we use the formula below to calculate mola ...
... We could use mass spectrometry (MS). This would give the exact mass of each isotope present in the sample and the relative amount of each isotope present in the sample (wchich allows calculation of percent abundance for each isotope). From this information, we use the formula below to calculate mola ...
Redox
![](https://commons.wikimedia.org/wiki/Special:FilePath/NaF.gif?width=300)
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.