Cl Cl and
... Too much energy is needed to remove 4 electrons from an atom. Too much energy is needed to insert 4 electrons into an atom in order to overcome the repulsive forces between like charges. 28. Why do elements of groups 6 and 7 form ions of charge –2 and –1 respectively? By gaining electrons they achie ...
... Too much energy is needed to remove 4 electrons from an atom. Too much energy is needed to insert 4 electrons into an atom in order to overcome the repulsive forces between like charges. 28. Why do elements of groups 6 and 7 form ions of charge –2 and –1 respectively? By gaining electrons they achie ...
namimg compounds
... In the early days of chemistry, there was no system for the naming of compounds. Chemists used common names like bicarb of soda, quicklime, milk of magnesia, Epsom salts, spirits of salt, and laughing gas to describe compounds. As the number of named compounds increased it was obvious that if such c ...
... In the early days of chemistry, there was no system for the naming of compounds. Chemists used common names like bicarb of soda, quicklime, milk of magnesia, Epsom salts, spirits of salt, and laughing gas to describe compounds. As the number of named compounds increased it was obvious that if such c ...
Chapter 19: Molecules and Compounds
... Writing Chemical Formulas with polyatomic ions “poly” means many. See page 591: Oxidation #’s for polyatomic ions. Each polyatomic ion is treated like a single ion. ...
... Writing Chemical Formulas with polyatomic ions “poly” means many. See page 591: Oxidation #’s for polyatomic ions. Each polyatomic ion is treated like a single ion. ...
Name ……………………………..………...… …….. Index No
... b) 20g of potassium chloride were placed in a glass beaker and 40.0cm3 of water were added. The beaker was heated until all the potassium chloride had dissolved and then allowed to cool. When crystals first appear the temperature was noted. An extra 5.0cm3 of water were added and the experiment was ...
... b) 20g of potassium chloride were placed in a glass beaker and 40.0cm3 of water were added. The beaker was heated until all the potassium chloride had dissolved and then allowed to cool. When crystals first appear the temperature was noted. An extra 5.0cm3 of water were added and the experiment was ...
USNCO 2004 National
... When you have selected your answer to each question, blacken the corresponding space on the answer sheet using a soft, #2 pencil. Make a heavy, full mark, but no stray marks. If you decide to change an answer, erase the unwanted mark very carefully. There is only one correct answer to each question. ...
... When you have selected your answer to each question, blacken the corresponding space on the answer sheet using a soft, #2 pencil. Make a heavy, full mark, but no stray marks. If you decide to change an answer, erase the unwanted mark very carefully. There is only one correct answer to each question. ...
The Chemical Basis of Life
... Element: A pure substance that can not be broken down into other substances by chemical means. ...
... Element: A pure substance that can not be broken down into other substances by chemical means. ...
Matter in Chemistry
... heat to boil an egg, it causes a chemical reaction between the yolk and the white that leaves a green film around the yolk. That film is iron sulfide, caused by iron in the yolk reacting with hydrogen sulfide in the white (it won't hurt you to eat it, and the egg will taste the same). ...
... heat to boil an egg, it causes a chemical reaction between the yolk and the white that leaves a green film around the yolk. That film is iron sulfide, caused by iron in the yolk reacting with hydrogen sulfide in the white (it won't hurt you to eat it, and the egg will taste the same). ...
Basic Chemistry – Terminology and Reactions
... A radical is a group of atoms of the same or different elements that behaves as a single unit with a positive or negative charge. VALENCY The valency of an atom or ion is the number of electrons it shares, loses or gains in a chemical reaction to become stable i.e. the number of bonds it forms w ...
... A radical is a group of atoms of the same or different elements that behaves as a single unit with a positive or negative charge. VALENCY The valency of an atom or ion is the number of electrons it shares, loses or gains in a chemical reaction to become stable i.e. the number of bonds it forms w ...
CHEM 13 NEWS EXAM 1998 - University of Waterloo
... Fe loses electrons less readily than Mg, making Mg the anode. ...
... Fe loses electrons less readily than Mg, making Mg the anode. ...
Oxidation-Reduction (REDOX) Reactions
... If we combine these and cancel the electrons (because we have the same number on both sides), we get the balanced net ionic equation: 2 Al0 (s) + 3 Zn2+ (aq) → 2 Al3+ (aq) + 3 Zn0 (s) ...
... If we combine these and cancel the electrons (because we have the same number on both sides), we get the balanced net ionic equation: 2 Al0 (s) + 3 Zn2+ (aq) → 2 Al3+ (aq) + 3 Zn0 (s) ...
File
... “Exothermic” means that heat is released during the reaction. This often results in the reaction container feeling warm to the touch (heat is given off). Reactants Products + HEAT (heat on product side because released) “Endothermic” means that heat is absorbed during the reaction. This often resu ...
... “Exothermic” means that heat is released during the reaction. This often results in the reaction container feeling warm to the touch (heat is given off). Reactants Products + HEAT (heat on product side because released) “Endothermic” means that heat is absorbed during the reaction. This often resu ...
Electric current is a flow of charge.
... current using the chemical or physical properties of different materials. ...
... current using the chemical or physical properties of different materials. ...
Vocabulary Notes
... A mixture of two or more metals or metals and non-metals that result in the mixture having different properties than their component elements. Ex. Stainless Steel. ...
... A mixture of two or more metals or metals and non-metals that result in the mixture having different properties than their component elements. Ex. Stainless Steel. ...
chapter 4 lecture slides
... * Arranges metals according to their ease of oxidation *The higher the metal on the Activity Series, the more active that metal (the easier it is oxidized.)Any metal can be oxidized by the metal ions below it. *Any metal above hydrogen will displace it from water or from an acid. ...
... * Arranges metals according to their ease of oxidation *The higher the metal on the Activity Series, the more active that metal (the easier it is oxidized.)Any metal can be oxidized by the metal ions below it. *Any metal above hydrogen will displace it from water or from an acid. ...
Unit 13 Worksheet Answers
... (a) HgO is added to the system increase (c) decrease the temperature of the system. increase (b) Hg is added to the system. decrease (d) the volume is decreased. No change 18) Predict the effect of decreasing the temperature on the position of the following equilibrium. (a) H 2 (g) + Cl 2 (g) ↔ 2HCl ...
... (a) HgO is added to the system increase (c) decrease the temperature of the system. increase (b) Hg is added to the system. decrease (d) the volume is decreased. No change 18) Predict the effect of decreasing the temperature on the position of the following equilibrium. (a) H 2 (g) + Cl 2 (g) ↔ 2HCl ...
document
... from each other. This is called dissociation. However, not all ionic compounds are soluble in water! ...
... from each other. This is called dissociation. However, not all ionic compounds are soluble in water! ...
Ch. 3 - Chemical Reactions
... Zn(s) + 2HCl(aq) ZnCl2(aq) + H2(g) • How many? • Of what? • In what state? ...
... Zn(s) + 2HCl(aq) ZnCl2(aq) + H2(g) • How many? • Of what? • In what state? ...
NAME
... j) a copper coil is placed into a solution of silver nitrate, silver crystals form on the surface of the copper. Additionally, highly soluble copper (I) nitrate is generated ...
... j) a copper coil is placed into a solution of silver nitrate, silver crystals form on the surface of the copper. Additionally, highly soluble copper (I) nitrate is generated ...
Ionic bonding
... 3. Elements in group 7 form ions with what charge? 4. Elements in group 3 form ions with what charge? 5. Ionic compounds are held together by strong E _ _ _ _ _ _ _ _ _ _ _ C forces in all directions between oppositely charged ions. 6. Under what 2 conditions will ionic compounds conduct electricity ...
... 3. Elements in group 7 form ions with what charge? 4. Elements in group 3 form ions with what charge? 5. Ionic compounds are held together by strong E _ _ _ _ _ _ _ _ _ _ _ C forces in all directions between oppositely charged ions. 6. Under what 2 conditions will ionic compounds conduct electricity ...
C2 Revision Quick Questions FT
... 3. Elements in group 7 form ions with what charge? 4. Elements in group 3 form ions with what charge? 5. Ionic compounds are held together by strong E _ _ _ _ _ _ _ _ _ _ _ C forces in all directions between oppositely charged ions. 6. Under what 2 conditions will ionic compounds conduct electricity ...
... 3. Elements in group 7 form ions with what charge? 4. Elements in group 3 form ions with what charge? 5. Ionic compounds are held together by strong E _ _ _ _ _ _ _ _ _ _ _ C forces in all directions between oppositely charged ions. 6. Under what 2 conditions will ionic compounds conduct electricity ...
C2 Revision Quick Questions FT
... 3. Elements in group 7 form ions with what charge? 4. Elements in group 3 form ions with what charge? 5. Ionic compounds are held together by strong E _ _ _ _ _ _ _ _ _ _ _ C forces in all directions between oppositely charged ions. 6. Under what 2 conditions will ionic compounds conduct electricity ...
... 3. Elements in group 7 form ions with what charge? 4. Elements in group 3 form ions with what charge? 5. Ionic compounds are held together by strong E _ _ _ _ _ _ _ _ _ _ _ C forces in all directions between oppositely charged ions. 6. Under what 2 conditions will ionic compounds conduct electricity ...
Introduction to Chemistry
... Ionic- Two elements bond by transferring electrons to create ions that attract together (+ is attracted to - after an electron is transferred) ...
... Ionic- Two elements bond by transferring electrons to create ions that attract together (+ is attracted to - after an electron is transferred) ...
Electrochemistry
Electrochemistry is the branch of physical chemistry that studies chemical reactions which take place at the interface of an electrode, usually a solid metal or a semiconductor, and an ionic conductor, the electrolyte. These reactions involve electric charges moving between the electrodes and the electrolyte (or ionic species in a solution). Thus electrochemistry deals with the interaction between electrical energy and chemical change.When a chemical reaction is caused by an externally supplied current, as in electrolysis, or if an electric current is produced by a spontaneous chemical reaction as in a battery, it is called an electrochemical reaction. Chemical reactions where electrons are transferred directly between molecules and/or atoms are called oxidation-reduction or (redox) reactions. In general, electrochemistry describes the overall reactions when individual redox reactions are separate but connected by an external electric circuit and an intervening electrolyte.