File
... To heat things, a Bunsen burner or hot plate can be used. To use a Bunsen burner, be sure that the tubing is snuggly fit on the valve. Make sure you have a lighter that gives you a good, reliable spark. Turn the valve all the way open so that you can hear the gas flowing. Hold the lighter spark side ...
... To heat things, a Bunsen burner or hot plate can be used. To use a Bunsen burner, be sure that the tubing is snuggly fit on the valve. Make sure you have a lighter that gives you a good, reliable spark. Turn the valve all the way open so that you can hear the gas flowing. Hold the lighter spark side ...
Gases - chemmybear.com
... would reduce the number (or frequency) of collisions of gas molecules with the surface of the balloon; [OR decrease the momentum change that occurs when the gas molecules strike the balloon surface] . In order to maintain a constant pressure vs the external pressure, the volume must decrease. (b) Th ...
... would reduce the number (or frequency) of collisions of gas molecules with the surface of the balloon; [OR decrease the momentum change that occurs when the gas molecules strike the balloon surface] . In order to maintain a constant pressure vs the external pressure, the volume must decrease. (b) Th ...
doc - Dartmouth College
... depth of answer that is expected. You should not be surprised to find that the depth of understanding expected in your answers to these questions sometimes goes beyond that expected in high school. To be awarded credit for Chemistry 5, a student must score at least 65% on the Chemistry Placement tes ...
... depth of answer that is expected. You should not be surprised to find that the depth of understanding expected in your answers to these questions sometimes goes beyond that expected in high school. To be awarded credit for Chemistry 5, a student must score at least 65% on the Chemistry Placement tes ...
Gas Laws
... 2. Elemental zinc, Zn, reacts violently with elemental sulfur, S8. If 1020. g of zinc react with 1.210 x 1024 atoms of sulfur, what is the limiting reagent, how many moles of product are produced? 3. 25.0 mL of 0.350 M NaOH are added to 45.0 mL of 0.125 M copper (II) sulfate. How many grams of preci ...
... 2. Elemental zinc, Zn, reacts violently with elemental sulfur, S8. If 1020. g of zinc react with 1.210 x 1024 atoms of sulfur, what is the limiting reagent, how many moles of product are produced? 3. 25.0 mL of 0.350 M NaOH are added to 45.0 mL of 0.125 M copper (II) sulfate. How many grams of preci ...
2nd Semester final review
... 37. What is the difference between a solute, a solvent, and a solution? Solute is the substance being dissolved (often solid) Solvent is the substance doing dissolving (usually liquid) Solution is the mixture of the two 38. Why do equations have to be balanced in the first place? Atoms can’t be crea ...
... 37. What is the difference between a solute, a solvent, and a solution? Solute is the substance being dissolved (often solid) Solvent is the substance doing dissolving (usually liquid) Solution is the mixture of the two 38. Why do equations have to be balanced in the first place? Atoms can’t be crea ...
practice spring final exam
... (A) are shared equally (B) are shared unequally (C) are not shared at all (D) are not involved in bonding ...
... (A) are shared equally (B) are shared unequally (C) are not shared at all (D) are not involved in bonding ...
Chemical (Elemental) Analysis - Fritz-Haber
... (liquid samples) Ø electro thermal vaporization (graphite furnace) liquid and solid samples Ø laser ablation solid samples ...
... (liquid samples) Ø electro thermal vaporization (graphite furnace) liquid and solid samples Ø laser ablation solid samples ...
2.4 Chemical equilibria
... At equilibrium, the rate of each reaction will be the same. What effect will this have on the amounts of A, B, C and D? Remember both reactions are still happening, but because they are doing so at the same rate the amounts of reactants and products remain constant. (It’s a bit like going up an esca ...
... At equilibrium, the rate of each reaction will be the same. What effect will this have on the amounts of A, B, C and D? Remember both reactions are still happening, but because they are doing so at the same rate the amounts of reactants and products remain constant. (It’s a bit like going up an esca ...
ΔG - Lemon Bay High School
... Analyze We are asked to judge whether each process is spontaneous in the direction indicated, in the reverse direction, or in neither direction. Plan We need to think about whether each process is consistent with our experience about the natural direction of events or whether we expect the reverse p ...
... Analyze We are asked to judge whether each process is spontaneous in the direction indicated, in the reverse direction, or in neither direction. Plan We need to think about whether each process is consistent with our experience about the natural direction of events or whether we expect the reverse p ...
Slide 1
... Analyze We are asked to judge whether each process is spontaneous in the direction indicated, in the reverse direction, or in neither direction. Plan We need to think about whether each process is consistent with our experience about the natural direction of events or whether we expect the reverse p ...
... Analyze We are asked to judge whether each process is spontaneous in the direction indicated, in the reverse direction, or in neither direction. Plan We need to think about whether each process is consistent with our experience about the natural direction of events or whether we expect the reverse p ...
Second Semester Review Part 1
... (C) If the compound is in state A, continued reduction of the pressure (at constant temperature) will cause it to melt. (D) None of these statements is correct. 100. A pure substance, above its melting point, is in a high pressure cylinder. Upon opening a valve on the cylinder a gas escapes. A press ...
... (C) If the compound is in state A, continued reduction of the pressure (at constant temperature) will cause it to melt. (D) None of these statements is correct. 100. A pure substance, above its melting point, is in a high pressure cylinder. Upon opening a valve on the cylinder a gas escapes. A press ...
- sartep.com
... 1. __________ A piece of calcite has a mass of 35.6 grams and a volume of 12.9 cm3. On which of the following liquids will calcite float? (A) carbon tetrachloride (density = 1.60 g/cm3) (B) methylene bromide (density = 2.50 g/cm3) (C) neither of the above substances (D) both of the above substances ...
... 1. __________ A piece of calcite has a mass of 35.6 grams and a volume of 12.9 cm3. On which of the following liquids will calcite float? (A) carbon tetrachloride (density = 1.60 g/cm3) (B) methylene bromide (density = 2.50 g/cm3) (C) neither of the above substances (D) both of the above substances ...
____ 1. The energy required to convert a ground
... a. Strong initial heating caused some of the d. The crucible was not heated to constant hydrate sample to spatter out of the mass before use. crucible. b. The dehydrated sample absorbed e. Excess heating caused the dehydrated moisture after heating. sample to decompose. c. The amount of the hydrate ...
... a. Strong initial heating caused some of the d. The crucible was not heated to constant hydrate sample to spatter out of the mass before use. crucible. b. The dehydrated sample absorbed e. Excess heating caused the dehydrated moisture after heating. sample to decompose. c. The amount of the hydrate ...
Note Sheets and Sample Problems
... parts, solutions including air - heterogeneous – have visibly distinguishable parts - means of physical separation include: filtering, fractional crystallization, distillation, chromatography ...
... parts, solutions including air - heterogeneous – have visibly distinguishable parts - means of physical separation include: filtering, fractional crystallization, distillation, chromatography ...
WA AP Chem gas law IMF MC Set C
... bonds, and these forces of attraction between molecules enable the water to be adhesive to the manometer, and resist the pressures of the gas and the atmosphere. B. The manometer containing water, because water is less dense than mercury, and therefore requires more pressure to move so it will move ...
... bonds, and these forces of attraction between molecules enable the water to be adhesive to the manometer, and resist the pressures of the gas and the atmosphere. B. The manometer containing water, because water is less dense than mercury, and therefore requires more pressure to move so it will move ...
Theoretical problems - Scheikundeolympiade
... breath takes around 5 seconds. Estimate the number of collisions with the surface of the lungs during a single breath on a typical British summer day. You should assume that the pressure in the lungs remains constant at atmospheric pressure; this is a reasonable approximation, as the pressure in the ...
... breath takes around 5 seconds. Estimate the number of collisions with the surface of the lungs during a single breath on a typical British summer day. You should assume that the pressure in the lungs remains constant at atmospheric pressure; this is a reasonable approximation, as the pressure in the ...
Part I - American Chemical Society
... already entered for you. Make a record of this ID number because you will use the same number on Parts II and III. Each item in Part I consists of a question or an incomplete statement that is followed by four possible choices. Select the single choice that best answers the question or completes the ...
... already entered for you. Make a record of this ID number because you will use the same number on Parts II and III. Each item in Part I consists of a question or an incomplete statement that is followed by four possible choices. Select the single choice that best answers the question or completes the ...
First Semester Final Review
... a. Mg(OH)2(s) b. (NH4)2CO3(s) c. CuSO4(s) d. (NH4)2SO4(s) e. Sr(NO3)2(s) 45. In which of the following processes are covalent bonds broken? a. I2(s) I2(g) b. CO2(s) CO2(g) c. NaCl(s) NaCl(l) d. C(diamond) C(g) e. Fe(s) Fe(l) 46. What is the final concentration of barium ions, [Ba2+], in so ...
... a. Mg(OH)2(s) b. (NH4)2CO3(s) c. CuSO4(s) d. (NH4)2SO4(s) e. Sr(NO3)2(s) 45. In which of the following processes are covalent bonds broken? a. I2(s) I2(g) b. CO2(s) CO2(g) c. NaCl(s) NaCl(l) d. C(diamond) C(g) e. Fe(s) Fe(l) 46. What is the final concentration of barium ions, [Ba2+], in so ...
Gas Laws
... 7. What are the three possible elements that hydrogen atom must be attached to, in a compound, in order for the compound to contain hydrogen bonding? 8. Explain how London dispersion forces arise. Although London dispersion forces exist among all molecules, for what type of molecules are they the on ...
... 7. What are the three possible elements that hydrogen atom must be attached to, in a compound, in order for the compound to contain hydrogen bonding? 8. Explain how London dispersion forces arise. Although London dispersion forces exist among all molecules, for what type of molecules are they the on ...
Chapter 10: Gases
... The subscripts “1” and “2” in Equation 10.1 indicate the different experimental conditions before and after pressure or volume is changed. Example Problem 10.2.1 Use Boyle’s law to calculate volume. A sample of gas has a volume of 458 mL at a pressure of 0.970 atm. The gas is compressed and now has ...
... The subscripts “1” and “2” in Equation 10.1 indicate the different experimental conditions before and after pressure or volume is changed. Example Problem 10.2.1 Use Boyle’s law to calculate volume. A sample of gas has a volume of 458 mL at a pressure of 0.970 atm. The gas is compressed and now has ...
Chapter 10 - Chemical Quantities
... 21. Find the empirical formula of a compound, given that the compound is found to be 47.9% zinc (Zn) and 52.1% chlorine (Cl) by mass. (Zn = 65.4 g/mol; Cl = 35.5 g/mol) Ans: ZnCl2 22. Find the empirical formula of a compound, given that a 48.5-g sample of the compound is found to contain 1.75 g of c ...
... 21. Find the empirical formula of a compound, given that the compound is found to be 47.9% zinc (Zn) and 52.1% chlorine (Cl) by mass. (Zn = 65.4 g/mol; Cl = 35.5 g/mol) Ans: ZnCl2 22. Find the empirical formula of a compound, given that a 48.5-g sample of the compound is found to contain 1.75 g of c ...
SUPPLEMENTAL PROBLEMS FOR CHEM 110
... X and Y are two species, each consisting of one nucleus and a number of electrons. The two species are found to contain the same number of protons, the same number of neutrons, and different numbers of electrons. Which of the following statements about X and Y is correct? ...
... X and Y are two species, each consisting of one nucleus and a number of electrons. The two species are found to contain the same number of protons, the same number of neutrons, and different numbers of electrons. Which of the following statements about X and Y is correct? ...
Chapter 1
... I know of two good methods for experimentally checking the Maxwell distribution of speeds: time-of-flight methods, including the use of slotted-disk “velocity selectors”, probably described in your textbook, and Doppler spectroscopy. In a velocity selector experiment, molecules leave a source throug ...
... I know of two good methods for experimentally checking the Maxwell distribution of speeds: time-of-flight methods, including the use of slotted-disk “velocity selectors”, probably described in your textbook, and Doppler spectroscopy. In a velocity selector experiment, molecules leave a source throug ...
2 The Nature of Matter
... produces a bubble. The vapour pressure inside the bubble the surface without collapsing. acts to inflate the bubble while the weight of the water and air above the bubble creates an opposing pressure that acts to collapse the bubble. As the bubble rises, the water vapour molecules transfer energy to ...
... produces a bubble. The vapour pressure inside the bubble the surface without collapsing. acts to inflate the bubble while the weight of the water and air above the bubble creates an opposing pressure that acts to collapse the bubble. As the bubble rises, the water vapour molecules transfer energy to ...
Gas chromatography
Gas chromatography (GC) is a common type of chromatography used in analytical chemistry for separating and analyzing compounds that can be vaporized without decomposition. Typical uses of GC include testing the purity of a particular substance, or separating the different components of a mixture (the relative amounts of such components can also be determined). In some situations, GC may help in identifying a compound. In preparative chromatography, GC can be used to prepare pure compounds from a mixture.In gas chromatography, the mobile phase (or ""moving phase"") is a carrier gas, usually an inert gas such as helium or an unreactive gas such as nitrogen. The stationary phase is a microscopic layer of liquid or polymer on an inert solid support, inside a piece of glass or metal tubing called a column (a homage to the fractionating column used in distillation). The instrument used to perform gas chromatography is called a gas chromatograph (or ""aerograph"", ""gas separator"").The gaseous compounds being analyzed interact with the walls of the column, which is coated with a stationary phase. This causes each compound to elute at a different time, known as the retention time of the compound. The comparison of retention times is what gives GC its analytical usefulness.Gas chromatography is in principle similar to column chromatography (as well as other forms of chromatography, such as HPLC, TLC), but has several notable differences. First, the process of separating the compounds in a mixture is carried out between a liquid stationary phase and a gas mobile phase, whereas in column chromatography the stationary phase is a solid and the mobile phase is a liquid. (Hence the full name of the procedure is ""Gas–liquid chromatography"", referring to the mobile and stationary phases, respectively.) Second, the column through which the gas phase passes is located in an oven where the temperature of the gas can be controlled, whereas column chromatography (typically) has no such temperature control. Finally, the concentration of a compound in the gas phase is solely a function of the vapor pressure of the gas.Gas chromatography is also similar to fractional distillation, since both processes separate the components of a mixture primarily based on boiling point (or vapor pressure) differences. However, fractional distillation is typically used to separate components of a mixture on a large scale, whereas GC can be used on a much smaller scale (i.e. microscale).Gas chromatography is also sometimes known as vapor-phase chromatography (VPC), or gas–liquid partition chromatography (GLPC). These alternative names, as well as their respective abbreviations, are frequently used in scientific literature. Strictly speaking, GLPC is the most correct terminology, and is thus preferred by many authors.