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AH 2015 incl MG
... Some zinc metal is added to a flask containing an acidified solution of the dioxovanadium(V) ion, VO2+(aq). The flask is stoppered with some cotton wool and gently swirled. The colour of the solution turns from yellow to blue. Further swirling turns the solution from blue to green. Finally, the flas ...
... Some zinc metal is added to a flask containing an acidified solution of the dioxovanadium(V) ion, VO2+(aq). The flask is stoppered with some cotton wool and gently swirled. The colour of the solution turns from yellow to blue. Further swirling turns the solution from blue to green. Finally, the flas ...
Stoichiometry - Mr Field's Chemistry Class
... Without them the equation does not balance – each side of the reaction would have different numbers of each atom – which would ...
... Without them the equation does not balance – each side of the reaction would have different numbers of each atom – which would ...
Aqueous Solutions
... acid, the products are: 1) NaSO4 + H2O 2) NaSO3 + 2H2O 3) 2NaSO4 + H2O 4) Na2S + 2H2O 5) Na2SO4 + 2H2O ...
... acid, the products are: 1) NaSO4 + H2O 2) NaSO3 + 2H2O 3) 2NaSO4 + H2O 4) Na2S + 2H2O 5) Na2SO4 + 2H2O ...
Worksheet Significant Figures
... Density is calculated with two measurements, mass ÷ volume. Since both measurements have uncertainty, any calculated density will have uncertainty as well. There are two rules to keep in mind When adding or subtracting measurements, add the uncertainties. When multiplying or dividing measurements, a ...
... Density is calculated with two measurements, mass ÷ volume. Since both measurements have uncertainty, any calculated density will have uncertainty as well. There are two rules to keep in mind When adding or subtracting measurements, add the uncertainties. When multiplying or dividing measurements, a ...
Types of Reactions
... A common way to determine the concentration of a solution is via titration. We determine the concentration of one substance by allowing it to undergo a specific chemical reaction, of known stoichiometry, with another substance whose concentration is known (standard solution). Example: Suppose we kno ...
... A common way to determine the concentration of a solution is via titration. We determine the concentration of one substance by allowing it to undergo a specific chemical reaction, of known stoichiometry, with another substance whose concentration is known (standard solution). Example: Suppose we kno ...
Document
... Percentage Composition from Formulas Percent composition- the percentage by mass contributed by each element in the substance. C6H12O6 ...
... Percentage Composition from Formulas Percent composition- the percentage by mass contributed by each element in the substance. C6H12O6 ...
A flask contains 0
... Choices go from the o lowest number to the highest number o they are generally lined up by decimal points, even though this does not make the number list “straight” allows you to see decimal points and significant figures easier. Look for the word approximate in the question, if there, you can ...
... Choices go from the o lowest number to the highest number o they are generally lined up by decimal points, even though this does not make the number list “straight” allows you to see decimal points and significant figures easier. Look for the word approximate in the question, if there, you can ...
Document
... therefore an external voltage is required to drive the reaction (if no voltage is applied than an equilibrium would form at each electrode with oxidation and reduction occurring at each i.e. essentially no change) ...
... therefore an external voltage is required to drive the reaction (if no voltage is applied than an equilibrium would form at each electrode with oxidation and reduction occurring at each i.e. essentially no change) ...
Spontaniety Worked Examples
... Plan We expect ΔS to be positive if there is an increase in temperature, increase in volume, or increase in number of gas particles. The question states that the temperature is constant, and so we need to concern ourselves only with volume and number of particles. Solve (a) Evaporation involves a la ...
... Plan We expect ΔS to be positive if there is an increase in temperature, increase in volume, or increase in number of gas particles. The question states that the temperature is constant, and so we need to concern ourselves only with volume and number of particles. Solve (a) Evaporation involves a la ...
Chapter 6. Therrnochemistry
... (Ainitiat and A,o~=), we’d have the quantitative description we’re looking for. The problem is that q and w are path dependent properties, in other words their values change as the conditions and procedures used to carry out the reaction change. We need pathindependent properties that only depend on ...
... (Ainitiat and A,o~=), we’d have the quantitative description we’re looking for. The problem is that q and w are path dependent properties, in other words their values change as the conditions and procedures used to carry out the reaction change. We need pathindependent properties that only depend on ...
The Chemical Context of Life PPT
... form and in combinations called compounds. • Compound: consists of 2 or more different elements combined in a fixed ratio. • A compound has characteristics different from its element. • Na (soft metal, explodes in water) + Cl (poisonous gas) NaCl (a seasoning we sprinkle on food without fear!) ...
... form and in combinations called compounds. • Compound: consists of 2 or more different elements combined in a fixed ratio. • A compound has characteristics different from its element. • Na (soft metal, explodes in water) + Cl (poisonous gas) NaCl (a seasoning we sprinkle on food without fear!) ...
The Chemical Context of Life
... form and in combinations called compounds. • Compound: consists of 2 or more different elements combined in a fixed ratio. • A compound has characteristics different from its element. • Na (soft metal, explodes in water) + Cl (poisonous gas) NaCl (a seasoning we sprinkle on food without fear!) ...
... form and in combinations called compounds. • Compound: consists of 2 or more different elements combined in a fixed ratio. • A compound has characteristics different from its element. • Na (soft metal, explodes in water) + Cl (poisonous gas) NaCl (a seasoning we sprinkle on food without fear!) ...
Ch 17 Equilibrium
... N2O4(g) 2NO2(g). • At some time, the color stops changing and we have a mixture of N2O4 and NO2. • Chemical equilibrium is the point at which the rate of the forward reaction is equal to the rate of the reverse reaction. At that point, the concentrations of all species are constant. • Using the co ...
... N2O4(g) 2NO2(g). • At some time, the color stops changing and we have a mixture of N2O4 and NO2. • Chemical equilibrium is the point at which the rate of the forward reaction is equal to the rate of the reverse reaction. At that point, the concentrations of all species are constant. • Using the co ...
Chapter 7: The Mole and Chemical Composition
... You can also use this same technique to convert from moles of an element or compound to grams of that element or compound. See…we use a balance to measure out grams of substances, not moles. So it would be useful to be able to convert from grams to moles and vice versa. You use the molar mass (the n ...
... You can also use this same technique to convert from moles of an element or compound to grams of that element or compound. See…we use a balance to measure out grams of substances, not moles. So it would be useful to be able to convert from grams to moles and vice versa. You use the molar mass (the n ...
study material class X (science)
... Ans: We know that copper is more reactive than silver, so it will displace silver from its salt solution: Cu(s) + 2AgNO3(aq) Cu(NO3)2(aq)+2Ag(s) So the solution will turn blue due to the formation of copper nitrate. ...
... Ans: We know that copper is more reactive than silver, so it will displace silver from its salt solution: Cu(s) + 2AgNO3(aq) Cu(NO3)2(aq)+2Ag(s) So the solution will turn blue due to the formation of copper nitrate. ...
ap 2005 chemistry_b scoring guidelines - AP Central
... Write the formulas to show the reactants and the products for any FIVE of the laboratory situations described below. Answers to more than five choices will not be graded. In all cases, a reaction occurs. Assume that solutions are aqueous unless otherwise indicated. Represent substances in solution a ...
... Write the formulas to show the reactants and the products for any FIVE of the laboratory situations described below. Answers to more than five choices will not be graded. In all cases, a reaction occurs. Assume that solutions are aqueous unless otherwise indicated. Represent substances in solution a ...
Atoms, Elements and Compounds Home
... We would expect most students to attempt the silver level tasks. These tasks are designed to deepen the students’ understanding of the concepts met in the unit. Students who complete the all the silver level tasks to a suitable standard will be rewarded with two house points. We would expect some st ...
... We would expect most students to attempt the silver level tasks. These tasks are designed to deepen the students’ understanding of the concepts met in the unit. Students who complete the all the silver level tasks to a suitable standard will be rewarded with two house points. We would expect some st ...
Evidence for the Predominance of Condensed Phase Reaction in
... plots the CO2 production from C/Fe2O3 along with the O2 release from Fe2O3. This figure shows the same trend as that for C/CuO; that is, carbon dioxide is produced well before a gaseous oxidizer is available; therefore, the initiation of this reaction must also be in the condensed phase. This conclus ...
... plots the CO2 production from C/Fe2O3 along with the O2 release from Fe2O3. This figure shows the same trend as that for C/CuO; that is, carbon dioxide is produced well before a gaseous oxidizer is available; therefore, the initiation of this reaction must also be in the condensed phase. This conclus ...
bYTEBoss Chapter 4 Relative atomic mass and the mole
... • It can become very cumbersome to deal with such large numbers, especially during calculations. • To overcome this impracticality, chemists deal with multiples of particles, instead of individually. This is why we have a mole! ...
... • It can become very cumbersome to deal with such large numbers, especially during calculations. • To overcome this impracticality, chemists deal with multiples of particles, instead of individually. This is why we have a mole! ...
Stoichiometry
![](https://commons.wikimedia.org/wiki/Special:FilePath/Combustion_reaction_of_methane.jpg?width=300)
Stoichiometry /ˌstɔɪkiˈɒmɨtri/ is the calculation of relative quantities of reactants and products in chemical reactions.Stoichiometry is founded on the law of conservation of mass where the total mass of the reactants equals the total mass of the products leading to the insight that the relations among quantities of reactants and products typically form a ratio of positive integers. This means that if the amounts of the separate reactants are known, then the amount of the product can be calculated. Conversely, if one reactant has a known quantity and the quantity of product can be empirically determined, then the amount of the other reactants can also be calculated.As seen in the image to the right, where the balanced equation is:CH4 + 2 O2 → CO2 + 2 H2O.Here, one molecule of methane reacts with two molecules of oxygen gas to yield one molecule of carbon dioxide and two molecules of water. Stoichiometry measures these quantitative relationships, and is used to determine the amount of products/reactants that are produced/needed in a given reaction. Describing the quantitative relationships among substances as they participate in chemical reactions is known as reaction stoichiometry. In the example above, reaction stoichiometry measures the relationship between the methane and oxygen as they react to form carbon dioxide and water.Because of the well known relationship of moles to atomic weights, the ratios that are arrived at by stoichiometry can be used to determine quantities by weight in a reaction described by a balanced equation. This is called composition stoichiometry.Gas stoichiometry deals with reactions involving gases, where the gases are at a known temperature, pressure, and volume and can be assumed to be ideal gases. For gases, the volume ratio is ideally the same by the ideal gas law, but the mass ratio of a single reaction has to be calculated from the molecular masses of the reactants and products. In practice, due to the existence of isotopes, molar masses are used instead when calculating the mass ratio.