Predict Products in Chemical Reactions
Predict Products in Chemical Reactions
In chemistry, the chemical yield, the yield of the reaction, or only the rendement refers to the amount of reaction product produced in the chemical reaction. [1] Absolute rendement can be written as weight in grams or in moles (molar yield). The relative yield used as a calculation of the effectiveness of the procedure is calculated by dividing the amount of product obtained in moles by the theoretical yield in moles:
{\ Displaystyle {\ mbox {fractional rendemen}} = {\ frac {\ mbox {real rendemen}} {\ mbox {theoretical renditions}}}} {\ displaystyle {\ mbox {fractional rendemen}} = {\ frac {\ Mbox {actual rendemen}} {\ mbox {theoretical rendemen}}}}
To obtain a percentage yield, multiply the fractional yield by 100%.
One or more reactants in chemical reactions are often used redundantly. The theoretical rendement is calculated based on the number of moles of the limiting reagent. For this calculation, it is usually assumed that there is only one reaction involved.
The ideal chemical yield value (theoretical rendement) is 100%, a value highly unlikely to be achieved in its practice. Calculate the percentage of rendemen that is by using the following equations percent rendemen = weight yield / weight of yield divided by the sample weight multiplied by 100%
Example:
Chemistry students typically experience difficulty in predicting the products of chemical reactions. With practice, however, the process becomes progressively easier.
The first step---identifying the type of reaction involved---is usually the most difficult. The primary reaction types students encounter are displacement, acid-base and combustion. They are easily identified if the tell-tale signs are known. Displacement reactions involve two ionic compounds with cations and anions, such as sodium sulfate, in which sodium (Na?) is the cation and sulfate (SO?²?) is the anion. Ionic compounds always consist of a metal and a nonmetal or polyatomic (multiple-atom) anion. Decomposition reactions involve a single compound breaking into two or more compounds. Acid-base reactions must involve an acid (identified by its chemical formula that begins with “H,” such as HCl). Combustion reactions involve hydrogen or a hydrocarbon (such as CH?) reacting with oxygen (O?).
DISPLACEMENT REACTIONS
Identify the cation and anion of the compounds involved in the reaction, as well as their charges. If necessary, refer to tables of cations and anions, such as the one available at Penn State University’s website (See Resources). Sodium chloride (NaCl), for example, consists of a sodium ion (Na?) and a chloride ion (Cl?).
Exchange the anions of the two reactants to determine the products of the reaction. Displacement reactions take this general form:
AB + CD ? AD + CB
Thus, for a reaction between sodium chloride (NaCl) and silver nitrate (AgNO?):
NaCl + AgNO? ? NaNO? + AgCl
Determine whether the products are soluble. This may require referring to a list of “solubility rules,” such as that at Southern Methodist University (see Resources). In the example from Step 2, NaNO? is soluble and thus remains in solution, but AgCl is insoluble and will form a precipitate.
Verify that the reaction is balanced by adding coefficients in front of the reactants and products as necessary to ensure that each type of atom is present on each side of the reaction arrow in equal numbers. In the example from Step 2, the left side of the equation contains 1 Na, 1 Cl, 1 Ag, 1 N, and 3 O; the right side contains 1 Na, 1 Cl, 1 Ag, 1 N, and 3 O. Thus, the reaction is balanced.
ACID-BASE REACTIONS
Identify the acidic compound (containing H? in its formula) and the basic compound (usually a hydroxide, OH?).
Determine the products according to the general reaction:
acid + base ? salt + water
For example, the reaction of hydrochloric acid (HCl) with sodium hydroxide (NaOH) produces sodium chloride and water:
HCl + NaOH ? NaCl + H?O
Determine if the salt is soluble or insoluble by referring to the solubility rules.
Balance the reaction. In this case, the reaction from Step 2 is already balanced.
COMBUSTION REACTIONS
Determine the fuel (the source of carbon and/or hydrogen) and the oxidant (the source of oxygen) (see Resources). If the combustion is carried out in air, the oxidant is assumed to be molecular oxygen (O?). Other oxidants, such as nitrous oxide (N?O), are possible, but this would require special reaction conditions.
Predict the products by assuming this general reaction:
Fuel + oxidant ? CO? + H?O
For example, propane (C?H?) combines with O? during combustion as:
C?H? + O? ? CO? + H?O
Balance the reaction. For the example in Step 2:
C?H? + 5 O? ? 3 CO? + 4 H?O
Chemistry students typically experience difficulty in predicting the products of chemical reactions. With practice, however, the process becomes progressively easier.
The first step---identifying the type of reaction involved---is usually the most difficult. The primary reaction types students encounter are displacement, acid-base and combustion. They are easily identified if the tell-tale signs are known. Displacement reactions involve two ionic compounds with cations and anions, such as sodium sulfate, in which sodium (Na?) is the cation and sulfate (SO?²?) is the anion. Ionic compounds always consist of a metal and a nonmetal or polyatomic (multiple-atom) anion. Decomposition reactions involve a single compound breaking into two or more compounds. Acid-base reactions must involve an acid (identified by its chemical formula that begins with “H,” such as HCl). Combustion reactions involve hydrogen or a hydrocarbon (such as CH?) reacting with oxygen (O?).
DISPLACEMENT REACTIONS
Identify the cation and anion of the compounds involved in the reaction, as well as their charges. If necessary, refer to tables of cations and anions, such as the one available at Penn State University’s website (See Resources). Sodium chloride (NaCl), for example, consists of a sodium ion (Na?) and a chloride ion (Cl?).
Exchange the anions of the two reactants to determine the products of the reaction. Displacement reactions take this general form:
AB + CD ? AD + CB
Thus, for a reaction between sodium chloride (NaCl) and silver nitrate (AgNO?):
NaCl + AgNO? ? NaNO? + AgCl
Determine whether the products are soluble. This may require referring to a list of “solubility rules,” such as that at Southern Methodist University (see Resources). In the example from Step 2, NaNO? is soluble and thus remains in solution, but AgCl is insoluble and will form a precipitate.
Verify that the reaction is balanced by adding coefficients in front of the reactants and products as necessary to ensure that each type of atom is present on each side of the reaction arrow in equal numbers. In the example from Step 2, the left side of the equation contains 1 Na, 1 Cl, 1 Ag, 1 N, and 3 O; the right side contains 1 Na, 1 Cl, 1 Ag, 1 N, and 3 O. Thus, the reaction is balanced.
ACID-BASE REACTIONS
Identify the acidic compound (containing H? in its formula) and the basic compound (usually a hydroxide, OH?).
Determine the products according to the general reaction:
acid + base ? salt + water
For example, the reaction of hydrochloric acid (HCl) with sodium hydroxide (NaOH) produces sodium chloride and water:
HCl + NaOH ? NaCl + H?O
Determine if the salt is soluble or insoluble by referring to the solubility rules.
Balance the reaction. In this case, the reaction from Step 2 is already balanced.
COMBUSTION REACTIONS
Determine the fuel (the source of carbon and/or hydrogen) and the oxidant (the source of oxygen) (see Resources). If the combustion is carried out in air, the oxidant is assumed to be molecular oxygen (O?). Other oxidants, such as nitrous oxide (N?O), are possible, but this would require special reaction conditions.
Predict the products by assuming this general reaction:
Fuel + oxidant ? CO? + H?O
For example, propane (C?H?) combines with O? during combustion as:
C?H? + O? ? CO? + H?O
Balance the reaction. For the example in Step 2:
C?H? + 5 O? ? 3 CO? + 4 H?O
Can you explain how to predict rendement of product? And give me some question with the answer about this lesson...
BalasHapusSugar Cane Rendement
HapusThe yield of sugarcane is the content of sugar content in the cane stalk expressed by percent. If it is said that the 10% sugar cane yield means that from 100 kg of sugar cane that is milled in Sugar Factory will get sugar as much as 10 kg.
There are 3 kinds of rendemen, namely: sample yield, temporary rendement, and effective yield.
1. Rendement Example
This content is a contah used to determine whether a sugarcane garden has reached the optimum or not. In other words contah rendemen is to know the description of a sugarcane plant how the level of rendemen that already exist so it can be known when when the right cutting and when sugar cane reaches an adequate level of rendemen.
Formula: Value of juice x Factor rendemen = Rendemen.
2. Temporary Rendement
This calculation is carried out to determine the revenue share of sugar, but the nature is still temporary.This is to meet the provisions that instruct that the determination of the share of sugar is done immediately after the sugarcane farmers milled so that farmers do not wait too long to finish milling but notified by the calculation of the temporary yield.
How to get this temporary rendemen is to take the first sugar cane juice that is milled to be analyzed in the laboratory to find out how much the temporary rendemen.
Formula: Temporary Rendemen = Rendemen Factor x Value Nira.
3. Effective Rendemen
The effective yield is also called the actual yield or corrected rendement. The effective yield is the yield of the calculation after the cane is milled out within a certain period of time. The calculation of the effective yield can be carried out within 15 days or called 1 milling period so that if the sugar mill has 170 mill days, then the mill period is 170/15 = 12 period.This means there are 12 times the actual / effective yield that can be calculated and notified to sugar cane farmers.
Sugar cane milled in a sugar factory is clear only a small part of it will be sugar. If 1 quintal sugar cane has 10% yield then only 10 kg of sugar obtained from 1 kuintal sugar cane tersebut.Hal can be described as follows:
Cane
100%
Fiber
+ 12.5%
Nira
+ 87.5%
Water
75 - 80%
Bhn Dry
20-25%
Late
18 - 20%
Not Soluble
2 - 5%
Is there a rendemen that you get from the data above? As in combustion reaction?
BalasHapusBurning 'is a sequence of chemical reactions between a fuel and an oxidant, accompanied by the occasional heat production accompanied by light in the form of a fluorescent or flame.
HapusIn a complete combustion reaction, a compound reacts with an oxidizing agent, and the product is a compound of each element in the fuel with the oxidizing agent. Example:
{\ Displaystyle CH_ {4} + 2O_ {2} \ rightarrow \; CO_ {2} + 2H_ {2} O + {\ textrm {hot}}} {\ displaystyle CH_ {4} + 2O_ {2} \ rightarrow \; CO_ {2} + 2H_ {2} O + {\ textrm {hot}}}
The standard reaction enthalpy for combustion of methane at 298.15 K and 1 atm is -802 kJ / mol. [1]
Another example:
{\ Displaystyle CH_ {2} S + 6F_ {2} \ rightarrow \; CF_ {4} + 2HF + SF_ {6} + {\ textrm {hot}}} {\ displaystyle CH_ {2} S + 6F_ {2} \ Rightarrow \; CF_ {4} + 2HF + SF_ {6} + {\ textrm {hot}}}
A simpler example can be observed in the combustion of hydrogen and oxygen, which is a common reaction used in rocket engines, which produce only water vapor, with the standard enthalpy reaction at 298.15 K and 1 atm being -242 kJ / mol. [1] :
{\ Displaystyle 2H_ {2} + O_ {2} \ rightarrow \; 2H_ {2} O + {\ textrm {hot}}} {\ displaystyle 2H_ {2} + O_ {2} \ rightarrow \; 2H_ {2} O + {\ Textrm {hot}}}
In the majority of daily burning, oxygen (O2) oxygen is obtained from ambient air and resultant gas (flue gas, flue gas) from combustion will contain nitrogen:
{\ Displaystyle CH_ {4} + 2O_ {2} + 7.52N_ {2} \ rightarrow \; CO_ {2} + 2H_ {2} O + 7.52N_ {2} + {\ textrm {summer}}} {\ displaystyle CH_ {4} + 2O_ {2} + 7.52N_ {2} \ rightarrow \; CO_ {2} + 2H_ {2} O + 7.52N_ {2} + {\ textrm {hot}}}
As can be seen, if air is the source of oxygen, nitrogen covers a very large part of the resulting chimney gas.
In reality, the burning process is never perfect. In a flue gas from carbon burning (as in coal combustion) or carbon compounds (such as in combustion of hydrocarbons, wood, etc.) will be found in both unburned carbon and carbon (CO and other) compounds. If combustion at high temperatures using air (containing 78% nitrogen), then a small amount of nitrogen will react to various types of harmful nitrogen oxides (NOx).
Give an example of a combustion reaction in life?
BalasHapusExample: burning gasoline (C8H18) as follows.
Hapus1. Perfect burning produces CO2 and moisture.
2 C8H18 (l) + 25 O2 (g) à 16 CO2 (g) + 18 H2O (g) ΔH = - 5,460 kJ
2. Incomplete combustion results in CO and moisture.
2 C8H18 (l) + 17 O2 (g) à 16 CO (g) + 18 H2O (g) ΔH = - 2924.4 kJ
Incomplete combustion produces less heat than complete combustion. Thus incomplete combustion reduces fuel efficiency. Another disadvantage is the production of toxic CO gas. Therefore, incomplete combustion will pollute the air.
The longer the carbon chain, the burning of fuel will be more perfect. So it is better to use short-carbon fossil fuels to reduce pollution.
What is the function of calculating the rendement of a chemical reaction.
BalasHapusIn chemistry, the chemical yield, the yield of the reaction, or only the rendement refers to the amount of reaction product produced in the chemical reaction. [1] Absolute rendement can be written as weight in grams or in moles (molar yield). The relative yield used as a calculation of the effectiveness of the procedure is calculated by dividing the amount of product obtained in moles by the theoretical yield in moles:
Hapus{\ Displaystyle {\ mbox {fractional rendemen}} = {\ frac {\ mbox {real rendemen}} {\ mbox {theoretical renditions}}}} {\ displaystyle {\ mbox {fractional rendemen}} = {\ frac {\ Mbox {actual rendemen}} {\ mbox {theoretical rendemen}}}}
To obtain a percentage yield, multiply the fractional yield by 100%.
Can you please explain about "Absolute Rendemen can be written as weight in grams or on moles (molar product)"?
BalasHapusThe absolute rendement may be written as a weight in grams or in moles (molar yield) meaning here is a heavy absolute rendement in grams or in a particular mole of molar rendement but the ideal chemical yield value (theoretical rendement) is 100%, an extremely unattainable value On its preaktek. Calculate the percentage of rendement that is by using the following equations percent rendemen = weight yield / weight of yield divided by the sample weight multiplied by 100%
HapusIn your article why is AgCl not soluble?
BalasHapusOkay, in the settling reaction, three conditions apply whether the mixture of the compound is precipitated, in addition here also played the concept of ion names to get Qsp: (Ket = Qsp is the second Ksp data of the product times [Ion-ion]; Ksp is the actual Ksp data)
Hapus1. Qsp Ksp; Settles
Well, go to the direct example example yuk:
1. 500 mL of AgNO3 10 ^ -4 M solution is mixed entirely with 500 ml of NaCl 2 x 10 ^ -6 M solution, is there precipitate? (Ksp AgCl = 1.6 x 10 ^ -10)
-> First, the lyrics of Ksp data, there is AgCl compound. AgCl can be formed from chemical reactions between AgNO3 and NaCl through the namesake ion, Ag + and Cl-.
* [AgNO3] = [Ag +]
= V1 x M1 / V1 + V2
= (500 ml x 10 ^ -4 M) / 500 mL + 500 mL
= 5 x 10 ^ -5 M
* [NaCl] = [Cl-]
= V2 x M2 / V1 + V2
= (500 mL x 2 x 10 ^ -6) 1000 mL
= 10 ^ -6 M
-> Second, enter [Ag +] and [Cl-] into AgCl ionization reaction to get Qsp data:
AgCl ⇆ Ag + + Cl-
Qsp = [Ag +] [Cl-]
= [5 x 10 ^ -5] [10 ^ -6]
= 5 x 10 ^ -11
-> In accordance with the above 3 rules, then Qsp AgCl <Ksp AgCl, then there is no precipitate.
Please explain about displacement reaction and give me the example
BalasHapusSingle displacement reactions - Single displacement reactions are also called replacement reactions. Which means it is a reaction in which one compound takes the substance of another compound. The equation is A + BC → AC + B.
HapusDouble displacement reactions - Double displacement reactions are also called metathesis reactions. You can think of it as two compounds undergoing an exchange. The equation is AB + CD → AD + CB.
why The ideal chemical yield value (theoretical rendement) is 100%, a value highly unlikely to be achieved in its practice?
BalasHapusThe chemical yield, the yield of the reaction, or only the rendement refers to the amount of reaction product produced in the chemical reaction. [1] Absolute rendement can be written as weight in grams or in moles (molar yield). The relative yield used as a calculation of the effectiveness of the procedure is calculated by dividing the amount of product obtained in moles by the theoretical yield in moles
HapusYou mentioned the anion exchange of two reactants to determine the reaction product, what is the meaning of it?
BalasHapusChemical reactions are a natural process that always results in the conversion of chemical compounds. [1] The compounds or the initial compounds involved in the reaction are referred to as reactants. Chemical reactions are usually characterized by chemical changes, and will result in one or more products that typically have different characteristics of the reactants. Classically, a chemical reaction involves a change involving the movement of electrons in the formation and disconnection of chemical bonds, although essentially the general concept of chemical reactions can also be applied to the transformation of elementary particles such as nuclear reactions.
HapusDifferent chemical reactions are used together in chemical synthesis to produce the desired product of the compound. In biochemistry, a series of enzyme-catalyzed chemical reactions form a metabolic pathway, in which synthesis and decomposition are usually impossible in the cell.
If the solution has a ksp, can the ksp has a relationship with predict the rendement in the reaction?
BalasHapusThe solubility product is generally denoted by Qc and the method of calculating Ksp is the product of the concentration of dissolved ions in a soluble salt. The difference is that the Qc value shows the solubility product in the unconfirmed state whether the solution is unsaturated, precisely saturated or over saturated (precipitated) while Ksp is the product of the concentration of ions decomposed in a soluble salt at the maximum (exact saturated). To know the state of the solution, we must know the value of Ksp first.
HapusWhat is the theoretical rendement?
BalasHapusTheoretical rendemen in moles:
Hapus{\ Displaystyle {\ mbox {fractional rendemen}} = {\ frac {\ mbox {real rendemen}} {\ mbox {theoretical renditions}}}} {\ displaystyle {\ mbox {fractional rendemen}} = {\ frac {\ Mbox {actual rendemen}} {\ mbox {theoretical rendemen}}}}
To obtain a percentage yield, multiply the fractional yield by 100%.
One or more reactants in chemical reactions are often used redundantly. The theoretical rendement is calculated based on the number of moles of the limiting reagent. For this calculation, it is usually assumed that there is only one reaction involved.