X273/13/02
... (c) The mass spectrum of compound A shows the molecular ion to have a mass/charge ratio of 74. Deduce the molecular formula of compound A. ...
... (c) The mass spectrum of compound A shows the molecular ion to have a mass/charge ratio of 74. Deduce the molecular formula of compound A. ...
الشريحة 1
... themselves on the surface of the NaCl crystals. The +ve end of H2O dipole is oriented toward the Clions, and the –ve end of the H2O dipole is oriented toward the Na+ ions. The ion-dipole attractions between the ions and H2O molecules are strong enough to pull the ions from their positions in the cry ...
... themselves on the surface of the NaCl crystals. The +ve end of H2O dipole is oriented toward the Clions, and the –ve end of the H2O dipole is oriented toward the Na+ ions. The ion-dipole attractions between the ions and H2O molecules are strong enough to pull the ions from their positions in the cry ...
Chapter 4. Aqueous Reactions and Solution Stoichiometry
... The solubility of a substance at a particular temperature is the amount of that substance that can be dissolved in a given quantity of solvent at that temperature. A substance with a solubility of less than 0.01 mol/L is regarded as being insoluble. Experimental observations have led to empirical gu ...
... The solubility of a substance at a particular temperature is the amount of that substance that can be dissolved in a given quantity of solvent at that temperature. A substance with a solubility of less than 0.01 mol/L is regarded as being insoluble. Experimental observations have led to empirical gu ...
WRITING AP EQUATIONS AP equation sets are found in the
... equation. All reactions do not fit neatly into the five types of reactions that you learned in Chemistry I. ...
... equation. All reactions do not fit neatly into the five types of reactions that you learned in Chemistry I. ...
Sample
... 2- Some collisions between reactant molecules do not form products. This is most likely because : aThe molecules do not collide in the proper ratio bThe molecules do not have enough energy cThe concentration is too low dThe reaction is at equilibrium 3- What is the expected shape of ethane? a) b) c) ...
... 2- Some collisions between reactant molecules do not form products. This is most likely because : aThe molecules do not collide in the proper ratio bThe molecules do not have enough energy cThe concentration is too low dThe reaction is at equilibrium 3- What is the expected shape of ethane? a) b) c) ...
chemistry advanced may 2010 marking scheme
... Because it consists of the aldehyde and water which do not mix. (1 mark) (ii) Explain giving essential experimental detail how a pure sample of butanal could be isolated from the distillate given that the boiling point of butanal is 75oC. ...
... Because it consists of the aldehyde and water which do not mix. (1 mark) (ii) Explain giving essential experimental detail how a pure sample of butanal could be isolated from the distillate given that the boiling point of butanal is 75oC. ...
Ch 4 Types of Chemical Reactions and Solution Stoichiometry
... What volume of 16 M sulfuric acid must be used to prepare 1.5 L of a 0.10 M sulfuric acid solution? (answer = 9.4 mL) (16 M)(x L) = (0.10 M)(1.5 L) x = 0.0094 L or 9.4 mL ...
... What volume of 16 M sulfuric acid must be used to prepare 1.5 L of a 0.10 M sulfuric acid solution? (answer = 9.4 mL) (16 M)(x L) = (0.10 M)(1.5 L) x = 0.0094 L or 9.4 mL ...
Lab Manual Yr 1 organic
... responsibility for laboratory safety lies with everyone working in the particular laboratory. Sensible laboratory conduct does not mean memorizing a list of rules! The true test is the actual conduct in the laboratory and safety rules apply to all laboratory activities. Each person‟s safety is affec ...
... responsibility for laboratory safety lies with everyone working in the particular laboratory. Sensible laboratory conduct does not mean memorizing a list of rules! The true test is the actual conduct in the laboratory and safety rules apply to all laboratory activities. Each person‟s safety is affec ...
CHEMISTRY 101 Name Mock Final Exam Spring 2014 Signature Dr
... You have a sample of gas at 25°C. At what temperature does the sample have twice the average kinetic energy? a) 50°C ...
... You have a sample of gas at 25°C. At what temperature does the sample have twice the average kinetic energy? a) 50°C ...
Liquid–liquid extraction
Liquid–liquid extraction (LLE) consists in transferring one (or more) solute(s) contained in a feed solution to another immiscible liquid (solvent). The solvent that is enriched in solute(s) is called extract. The feed solution that is depleted in solute(s) is called raffinate.Liquid–liquid extraction also known as solvent extraction and partitioning, is a method to separate compounds based on their relative solubilities in two different immiscible liquids, usually water and an organic solvent. It is an extraction of a substance from one liquid into another liquid phase. Liquid–liquid extraction is a basic technique in chemical laboratories, where it is performed using a variety of apparatus, from separatory funnels to countercurrent distribution equipment. This type of process is commonly performed after a chemical reaction as part of the work-up.The term partitioning is commonly used to refer to the underlying chemical and physical processes involved in liquid–liquid extraction, but on another reading may be fully synonymous with it. The term solvent extraction can also refer to the separation of a substance from a mixture by preferentially dissolving that substance in a suitable solvent. In that case, a soluble compound is separated from an insoluble compound or a complex matrix.Solvent extraction is used in nuclear reprocessing, ore processing, the production of fine organic compounds, the processing of perfumes, the production of vegetable oils and biodiesel, and other industries.Liquid–liquid extraction is possible in non-aqueous systems: In a system consisting of a molten metal in contact with molten salts, metals can be extracted from one phase to the other. This is related to a mercury electrode where a metal can be reduced, the metal will often then dissolve in the mercury to form an amalgam that modifies its electrochemistry greatly. For example, it is possible for sodium cations to be reduced at a mercury cathode to form sodium amalgam, while at an inert electrode (such as platinum) the sodium cations are not reduced. Instead, water is reduced to hydrogen. A detergent or fine solid can be used to stabilize an emulsion, or third phase.