AQA_GCSE_Chemistry_Higher_Unit_2_Notes
... a) The pressure brings the molecules closer together, so that they react faster and also give a greater yield of ammonia since the forward reaction is encouraged. However, pumps to provide high pressure are expensive. b) High temperature makes molecules move faster, so that they collide more often ...
... a) The pressure brings the molecules closer together, so that they react faster and also give a greater yield of ammonia since the forward reaction is encouraged. However, pumps to provide high pressure are expensive. b) High temperature makes molecules move faster, so that they collide more often ...
Writing And Balancing Equations
... On the left, Zn and HCl are reactants On the right, ZnCl2 and H2 are products The arrow () means “yields” The up arrow () indicated a gas product The 2 in front of HCl is a coefficient The small 2 to the right of H is a subscript ...
... On the left, Zn and HCl are reactants On the right, ZnCl2 and H2 are products The arrow () means “yields” The up arrow () indicated a gas product The 2 in front of HCl is a coefficient The small 2 to the right of H is a subscript ...
Lecture 4
... consumed!!! (You can also calculate afterwards how much of the other reactants are left-over.) There are (at least) two ways that you can use to calculate whether two reactants are completely consumed. (Toolbox M.1) Use whichever you prefer: Method 1: Determine whether there is enough of one reactan ...
... consumed!!! (You can also calculate afterwards how much of the other reactants are left-over.) There are (at least) two ways that you can use to calculate whether two reactants are completely consumed. (Toolbox M.1) Use whichever you prefer: Method 1: Determine whether there is enough of one reactan ...
AGE article for Sept 2013
... It is noteworthy that half equations for two important strong oxidants are not provided. You should be able to use your rules to write half equations for acidified MnO4– ions being reduced to Mn2+, and acidified Cr2O72– ions being reduced to Cr3+. Either of these may well be relevant when considerin ...
... It is noteworthy that half equations for two important strong oxidants are not provided. You should be able to use your rules to write half equations for acidified MnO4– ions being reduced to Mn2+, and acidified Cr2O72– ions being reduced to Cr3+. Either of these may well be relevant when considerin ...
Endothermic reactions
... break the original bonds than is released when new bonds are formed. As a result, some form of energy, such as light or heat, is given off by the reaction. The familiar glow from the reaction inside a glow stick, shown in Figure 19, is an example of an exergonic reaction, which produces visible ligh ...
... break the original bonds than is released when new bonds are formed. As a result, some form of energy, such as light or heat, is given off by the reaction. The familiar glow from the reaction inside a glow stick, shown in Figure 19, is an example of an exergonic reaction, which produces visible ligh ...
I. Properties of Matter
... a. Filtration – uses a porous barrier (filter) to separate a solid from a liquid b. Distillation – heating a mixture and collecting the condensation as the components turn to vapor • Different substances have different boiling points, so they turn to vapor at different times during the heating proce ...
... a. Filtration – uses a porous barrier (filter) to separate a solid from a liquid b. Distillation – heating a mixture and collecting the condensation as the components turn to vapor • Different substances have different boiling points, so they turn to vapor at different times during the heating proce ...
File - Mc Guckin Science
... z) Chemical bond: the force of attraction between two atoms that occurs when atoms exchange or share electrons to complete a stable octet electron arrangement. A chemical bond results in the atoms being held close together to form a molecule. aa) Stable Octet rule: atoms tend to gain, lose or share ...
... z) Chemical bond: the force of attraction between two atoms that occurs when atoms exchange or share electrons to complete a stable octet electron arrangement. A chemical bond results in the atoms being held close together to form a molecule. aa) Stable Octet rule: atoms tend to gain, lose or share ...
153KB PDF - Clydeview Academy
... Do not change any of these details. 4 If any of this information is wrong, tell the Invigilator immediately. 5 If this information is correct, print your name and seat number in the boxes provided. 6 The answer to each question is either A, B, C or D. Decide what your answer is, then, using your pen ...
... Do not change any of these details. 4 If any of this information is wrong, tell the Invigilator immediately. 5 If this information is correct, print your name and seat number in the boxes provided. 6 The answer to each question is either A, B, C or D. Decide what your answer is, then, using your pen ...
225 Unit 7, Lab 1 - Pope John Paul II High School
... In the example seen above, 3O2 had to be added to the right side of the equation to balance it and show that the excess oxygen is not consumed during the reaction. In this example, methane is called the limiting reactant. Although we have discussed balancing equations in terms of numbers of atoms an ...
... In the example seen above, 3O2 had to be added to the right side of the equation to balance it and show that the excess oxygen is not consumed during the reaction. In this example, methane is called the limiting reactant. Although we have discussed balancing equations in terms of numbers of atoms an ...
Unit 2 Chemical Reactions
... the series. This is used to predict if a reaction will occur or not. Single Displacement Reactions and the Activity Series (pg 130) It is possible to arrange metals in the order of their chemical reactivities and thereby establish an activity series of metals. ...
... the series. This is used to predict if a reaction will occur or not. Single Displacement Reactions and the Activity Series (pg 130) It is possible to arrange metals in the order of their chemical reactivities and thereby establish an activity series of metals. ...
Pauling Scale of Electronegativities for the Various Elements
... All salts dissociate nearly 100% in dilute solution. ...
... All salts dissociate nearly 100% in dilute solution. ...
AP Chemistry Summer Assignment
... 14. How many protons, neutrons and electrons are in each of the following ions? a. mass # 56 atomic # 26 Fe 3+ charge ____p ____n ____e b. mass # 40 atomic # 20 Ca 2+ charge ____p ____n ____e ...
... 14. How many protons, neutrons and electrons are in each of the following ions? a. mass # 56 atomic # 26 Fe 3+ charge ____p ____n ____e b. mass # 40 atomic # 20 Ca 2+ charge ____p ____n ____e ...
Topic 1 Assignment File
... b. Theoretical yield is 290 kg of product; actual yield is 270 kg c. Theoretical yield is 64 kg of product; actual yield is 324 g ...
... b. Theoretical yield is 290 kg of product; actual yield is 270 kg c. Theoretical yield is 64 kg of product; actual yield is 324 g ...
Chapter 12 Packet
... b. If it takes about 67.0L of nitrogen gas to fill an airbag perform the calculations to determine how much sodium azide is needed to create this volume of nitrogen gas. Remember, this reaction does not occur under STP conditions so you must use the density of N2 which is 0.916 g/L. ...
... b. If it takes about 67.0L of nitrogen gas to fill an airbag perform the calculations to determine how much sodium azide is needed to create this volume of nitrogen gas. Remember, this reaction does not occur under STP conditions so you must use the density of N2 which is 0.916 g/L. ...
9.1 REDOX Introduction to Oxidation and Reduction
... (Iraq) around 2500 BCE Heat made by burning charcoal was used to alloy copper and tin during the Bronze Age, 4500 BCE to 1200 BCE Copper & tin occur naturally, but this was the 1st evidence for the use of heat to reduce metallic ores, like iron oxides Evidence of iron oxides are found in India ...
... (Iraq) around 2500 BCE Heat made by burning charcoal was used to alloy copper and tin during the Bronze Age, 4500 BCE to 1200 BCE Copper & tin occur naturally, but this was the 1st evidence for the use of heat to reduce metallic ores, like iron oxides Evidence of iron oxides are found in India ...
Science24-UnitA-Section3.1-3.2
... 6. Why is it important to know if a reaction is exothermic or endothermic? ____________________________________________________________________________________________ ...
... 6. Why is it important to know if a reaction is exothermic or endothermic? ____________________________________________________________________________________________ ...
AQA GCSE Chemistry My Revision Notes
... (b) Aluminium ions: add sodium hydroxide solution ; white precipitate forms that dissolves in excess hydroxide (c) Carbonate ions: add hydrochloric acid , effervescence/bubbles of gas produced There is no limewater available so you are not expected to describe the test for carbon dioxide. ...
... (b) Aluminium ions: add sodium hydroxide solution ; white precipitate forms that dissolves in excess hydroxide (c) Carbonate ions: add hydrochloric acid , effervescence/bubbles of gas produced There is no limewater available so you are not expected to describe the test for carbon dioxide. ...
Hydrogen: An Assessment of Its Potential for Energy Use
... the potential for hydrogen energy to affect US energy applications from economic and national security standpoints is driven primarily by the possibility of developing practical transportation solutions. Hydrogen‐powered vehicles will use a hydrogen fuel cell or hydrogen co ...
... the potential for hydrogen energy to affect US energy applications from economic and national security standpoints is driven primarily by the possibility of developing practical transportation solutions. Hydrogen‐powered vehicles will use a hydrogen fuel cell or hydrogen co ...
Water splitting
Water splitting is the general term for a chemical reaction in which water is separated into oxygen and hydrogen. Efficient and economical water splitting would be a key technology component of a hydrogen economy. Various techniques for water splitting have been issued in water splitting patents in the United States. In photosynthesis, water splitting donates electrons to power the electron transport chain in photosystem II.