Question Paper - Revision Science
... Complete the equation for the reaction between the hydrochloric acid in the toilet cleaner and the chloric(I) acid in the bleaching agent. Give a reason why this reaction is to be avoided in accordance with the instructions for the use of the toilet cleaner. ...
... Complete the equation for the reaction between the hydrochloric acid in the toilet cleaner and the chloric(I) acid in the bleaching agent. Give a reason why this reaction is to be avoided in accordance with the instructions for the use of the toilet cleaner. ...
Irreversible Changes
... Stainless steel does not because traces of other metals have been added, this prevent the oxidising process which gives rise to the rusting. Galvanised steel or iron is coated in zinc, which also prevents rusting. Old copper coins react with the air and copper oxide forms making them ‘dirty’ and bla ...
... Stainless steel does not because traces of other metals have been added, this prevent the oxidising process which gives rise to the rusting. Galvanised steel or iron is coated in zinc, which also prevents rusting. Old copper coins react with the air and copper oxide forms making them ‘dirty’ and bla ...
unit 4 practice
... reactions occurs. The order in which the species listed above would react is _____ , _____ , _____ , and _____ ...
... reactions occurs. The order in which the species listed above would react is _____ , _____ , _____ , and _____ ...
Chapter 14…Kinetic Theory
... How many grams of NaNO3 will dissolve at 30C? Which substance is least soluble at 10C? Which two substances have the same solubility at 72C? 80 grams of KBr placed in 60C creates a (saturated/unsaturated/supersaturated) solution. When Be(NO3)2 (aq) and NaOH (aq) are mixed together, the resulting ...
... How many grams of NaNO3 will dissolve at 30C? Which substance is least soluble at 10C? Which two substances have the same solubility at 72C? 80 grams of KBr placed in 60C creates a (saturated/unsaturated/supersaturated) solution. When Be(NO3)2 (aq) and NaOH (aq) are mixed together, the resulting ...
Acid Base PPT - mvhs
... An Arrhenius acid solution contains an excess of H+ ions because an Arrhenius acid increases H+ concentration, when dissolved in water. An Arrhenius base solution contains an excess of OH- ions because it increases OH- concentration, when dissolved in ...
... An Arrhenius acid solution contains an excess of H+ ions because an Arrhenius acid increases H+ concentration, when dissolved in water. An Arrhenius base solution contains an excess of OH- ions because it increases OH- concentration, when dissolved in ...
Unit 8 Powerpoint
... for the reactants on the left and the formulas for the products on the right with a “yields” sign in between. • If two or more reactants or products are involved, ...
... for the reactants on the left and the formulas for the products on the right with a “yields” sign in between. • If two or more reactants or products are involved, ...
Chapter 4 - Aqueous Reactions
... A metal can be oxidized by any ion below it Metals above H, react with acids to give H2 The further up the series, the more readily the metal is oxidized See your textbook (p124) for more elements ...
... A metal can be oxidized by any ion below it Metals above H, react with acids to give H2 The further up the series, the more readily the metal is oxidized See your textbook (p124) for more elements ...
CHEMICAL REACTIONS
... aided by the addition of a small amount of an inorganic acid such as sulfuric to act as a dehydrating agent. • e. g. CH3COOH + CH3OH Æ CH3COOCH3 + HOH H. Complex ion reactions (coordination chemistry) : Usually involve transition metals and common ligands (see below). Since many complex ion reaction ...
... aided by the addition of a small amount of an inorganic acid such as sulfuric to act as a dehydrating agent. • e. g. CH3COOH + CH3OH Æ CH3COOCH3 + HOH H. Complex ion reactions (coordination chemistry) : Usually involve transition metals and common ligands (see below). Since many complex ion reaction ...
Catalytic Synthesis of Organophosphorus Compounds from
... and commercial interests have prompted us to investigate “chlorine free” protocols for the direct conversion of a various low-valent phosphorus-containing compounds (including elemental (white and red) phosphorus and such a waste from phosphorus industry as an effluent phosphine- and phosphorus cont ...
... and commercial interests have prompted us to investigate “chlorine free” protocols for the direct conversion of a various low-valent phosphorus-containing compounds (including elemental (white and red) phosphorus and such a waste from phosphorus industry as an effluent phosphine- and phosphorus cont ...
Science 9 Unit 2
... to see and they stay mixed. E.g. granite Suspensions are large mixed particles but separate if left or by filtering. E.g. liquid medications Colloids are fine particles evenly distributed through a second substance. E.g. hair gel and clouds. Emulsions are a type of colloid that are liquids in liquid ...
... to see and they stay mixed. E.g. granite Suspensions are large mixed particles but separate if left or by filtering. E.g. liquid medications Colloids are fine particles evenly distributed through a second substance. E.g. hair gel and clouds. Emulsions are a type of colloid that are liquids in liquid ...
CHM1 Review for Exam 9 Topics 1. Reaction Types a. Combustion
... a. Balance the equation provided using the lowest whole-number coefficient. b. ...
... a. Balance the equation provided using the lowest whole-number coefficient. b. ...
Chapter 3
... Trade partners – A goes with D and C goes with B. Once again, charges MUST be observed when recombining and formulas are written with cation first. Reaction only happens if one of the two products is Insoluble (s). LEP #14 a, b ...
... Trade partners – A goes with D and C goes with B. Once again, charges MUST be observed when recombining and formulas are written with cation first. Reaction only happens if one of the two products is Insoluble (s). LEP #14 a, b ...
Chemical Reactions Notes-1a-1
... This tends to stabilize the ions in solution and prevent cations and anions from recombining. The positive ions have the surrounding oxygen atoms of water pointing towards the ion, negative ions have the surrounding hydrogen atoms of water pointing towards the ion. The transport of ions through the ...
... This tends to stabilize the ions in solution and prevent cations and anions from recombining. The positive ions have the surrounding oxygen atoms of water pointing towards the ion, negative ions have the surrounding hydrogen atoms of water pointing towards the ion. The transport of ions through the ...
Journal of Physical and Chemical Reference Data
... number of ways and it is therefore literally impossible to catalog all the possible heats of reaction. To get around this problem we define for each substance a standard reaction and tabulate its associated heat of reaction. These reactions and their associated heats of reaction can then be used to ...
... number of ways and it is therefore literally impossible to catalog all the possible heats of reaction. To get around this problem we define for each substance a standard reaction and tabulate its associated heat of reaction. These reactions and their associated heats of reaction can then be used to ...
Document
... 3. Count the number of atoms of each element appearing on both sides of the equation. 4. Balance the elements one at a time by adding coefficients (the numbers in front) -Save H and O until LAST! ...
... 3. Count the number of atoms of each element appearing on both sides of the equation. 4. Balance the elements one at a time by adding coefficients (the numbers in front) -Save H and O until LAST! ...
Chemical Reactions-Multiple Choice Review
... 12) Chemical reactions _____.] A) occur only in living organisms B) create and destroy atoms C) only occur outside living organisms D) produce new substances 13) Which of the following is NOT a true statement concerning what happens in all chemical reactions? A) The ways in which atoms are joined t ...
... 12) Chemical reactions _____.] A) occur only in living organisms B) create and destroy atoms C) only occur outside living organisms D) produce new substances 13) Which of the following is NOT a true statement concerning what happens in all chemical reactions? A) The ways in which atoms are joined t ...
1. Natures Chemistry Unit Questions
... o Aldehydes can pack reasonable closely together o Ketones aren’t as straight and cant pack as well o Like proteins the intermolecular forces are broken on heating and this changes the taste and texture of molecules o Aldehydes and ketones are relatively soluble so can be washed out of foods during ...
... o Aldehydes can pack reasonable closely together o Ketones aren’t as straight and cant pack as well o Like proteins the intermolecular forces are broken on heating and this changes the taste and texture of molecules o Aldehydes and ketones are relatively soluble so can be washed out of foods during ...
82KB - NZQA
... In test tube A, a white precipitate / solid / deposit forms (or the solution turns cloudy white). The precipitate / solid / deposit is lead sulfate. In test tube B, a yellow precipitate / solid / deposit forms (or the solution turns cloudy yellow). The precipitate / solid / deposit is lead iodide. T ...
... In test tube A, a white precipitate / solid / deposit forms (or the solution turns cloudy white). The precipitate / solid / deposit is lead sulfate. In test tube B, a yellow precipitate / solid / deposit forms (or the solution turns cloudy yellow). The precipitate / solid / deposit is lead iodide. T ...
Chemical Equations
... 1. Write the reactants and products using formula and state for each substance 2. Count the number of atoms of each element on the left-hand side of the equation. Do the same for the right-hand side and compare for each element. If any of these numbers do not match, the equation is not balanced and ...
... 1. Write the reactants and products using formula and state for each substance 2. Count the number of atoms of each element on the left-hand side of the equation. Do the same for the right-hand side and compare for each element. If any of these numbers do not match, the equation is not balanced and ...
Form A 1 Chem 130 Name______________________________
... The rate changes by (6.75 x 10-4/3.35 x 10-4) = 2.01 times. Since the change in rate is the same as the change in concentration, the reaction must be first order in B. Now comparing reactions 2 and 3: [B] remains constant, but [A] changes by (0.0266/0.0133) = 2 times. The rate changes by (2.70 x 10- ...
... The rate changes by (6.75 x 10-4/3.35 x 10-4) = 2.01 times. Since the change in rate is the same as the change in concentration, the reaction must be first order in B. Now comparing reactions 2 and 3: [B] remains constant, but [A] changes by (0.0266/0.0133) = 2 times. The rate changes by (2.70 x 10- ...
Lewis acid catalysis
In Lewis acid catalysis of organic reactions, a metal-based Lewis acid acts as an electron pair acceptor to increase the reactivity of a substrate. Common Lewis acid catalysts are based on main group metals such as aluminum, boron, silicon, and tin, as well as many early (titanium, zirconium) and late (iron, copper, zinc) d-block metals. The metal atom forms an adduct with a lone-pair bearing electronegative atom in the substrate, such as oxygen (both sp2 or sp3), nitrogen, sulfur, and halogens. The complexation has partial charge-transfer character and makes the lone-pair donor effectively more electronegative, activating the substrate toward nucleophilic attack, heterolytic bond cleavage, or cycloaddition with 1,3-dienes and 1,3-dipoles.Many classical reactions involving carbon–carbon or carbon–heteroatom bond formation can be catalyzed by Lewis acids. Examples include the Friedel-Crafts reaction, the aldol reaction, and various pericyclic processes that proceed slowly at room temperature, such as the Diels-Alder reaction and the ene reaction. In addition to accelerating the reactions, Lewis acid catalysts are able to impose regioselectivity and stereoselectivity in many cases.Early developments in Lewis acid reagents focused on easily available compounds such as TiCl4, BF3, SnCl4, and AlCl3. The relative strengths of these (and other) Lewis acids may be estimated from NMR spectroscopy by the Childs method or the Gutmann-Beckett method. Over the years, versatile catalysts bearing ligands designed for specific applications have facilitated improvement in both reactivity and selectivity of Lewis acid-catalyzed reactions. More recently, Lewis acid catalysts with chiral ligands have become an important class of tools for asymmetric catalysis.Challenges in the development of Lewis acid catalysis include inefficient catalyst turnover (caused by catalyst affinity for the product) and the frequent requirement of two-point binding for stereoselectivity, which often necessitates the use of auxiliary groups.