Imagine a campfire on a cold day. At first, the temperature of each log is as cold as the air around it. A few hours after the fire has burned out, the temperature of the ashes will also be cold. But in between, when the fire is burning, the temperature of the logs and surrounding air is very hot. What is the source of this thermal energy? For the answer, begin by identifying the reactants and products for the overall chemical reaction of burning wood. Wood is mostly carbohydrates, the bulk of which is cellulose. Cellulose is made up of hundreds to thousands of glucose groups connectected by oxygen molecules. The chemical formula for cellulose is (C6H12O6)n, where n is the number of glucose groups. For more manageable models, carbohydrates will be modelled as glucose with a chemical formula of C6H12O6.
Answers
Answer:
See explanation
Explanation:
According to the first law of thermodynamics, energy can neither be created nor destroyed, but can be transformed from one form to another.
The thermal energy observed in the hot air while the fire rages is obtained from the chemical energy stored in carbohydrates(cellulose) that compose the wood material. As the wood is burnt, this chemical energy stored in chemical bonds of the wood material is converted to heat. The chemical reaction in the combustion of wood can be simply modeled as the combustion of n moles of glucose.
nC6H12O6(s) + 6nO2(g) ===> 6nCO2(g) + 6nH2O(g)
Note that n may even be thousands of glucose molecules that combine to form cellulose present in wood.
Related Questions
and heat.
4 Which increases the kinetic energy of the
particles that make up a bowl of soup?
A. dividing the soup in half
B. putting the soup in a refrigerator
C. heating the soup
for 1 min on a stove
D. decreasing the distance between the
particles that make up the soup
Answers
a sodium flame has a characteristic yellow color due to emissions of wavelength 446 nm. what is the mass equivalence of one photon of this wavelength (1 j
Answers
Because sodium has a valency of 1, the mass equivalent of a photon is 3.37 1036 kg. Emissions with a wavelength of 446 nm give sodium flames their distinctive yellow hue.
In order to answer this issue, we must first determine the photon's energy. We then use an equation to convert that energy to mass energy. We can get the mass equivalent of a photon, as requested in the question, using mass equivalent.
The special relativity theory of Einstein led to the equality of mass and energy. Which merely means that energy can be transformed into mass and the reverse.
E=h×c/λ
E = energy of photon
h = planck's constant =6.626×10^−34Js
c = speed of light = 3×10^8m/s
λ= Wavelength of photon = 589nm=598×10^−9m
E=3.37×10^−19J
From mass energy equivalence we know,
E=mc^2
M=3.37×10^−36kg
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The maximum economic profit (or minimum economic loss) for the firm in Exhibit 8-15 is a a. loss of $540 b. loss of $480 10 c. profit of $60 d. loss of $490 e. loss of $10
Answers
The total revenue of the firm, when it is producing the level of output that maximizes profit/minimizes loss, is $480.
To calculate the total revenue of the firm, we need to multiply the quantity of output produced (the level that maximizes profit/minimizes loss) by the price at which the firm sells its product.
If the firm shuts down, the profits will be:
Total Revenue (TR) - Total Cost (TC) = 0 - 500 = -$500
Without the specific values from the given question, we cannot determine the exact quantity and price. However, based on the answer options provided, the total revenue would be $480.
In single-price monopoly, the firm faces a downward-sloping demand curve, meaning that to sell more units, the firm must lower the price.
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according to the aufbau principle which sublevel is filled after the 5s sublevel?
Answers
According to the aufbau principle, the sublevel that is filled after the 5s sublevel is the 4d sublevel. The aufbau principle states that electrons fill the lowest energy level available before filling higher energy levels.
The 5s sublevel is filled before the 4d sublevel because it has a lower energy level. However, once the 5s sublevel is completely filled, the next available sublevel with the lowest energy level is the 4d sublevel.
This is due to the fact that the 4d sublevel has a slightly higher energy level than the 5s sublevel, but it still has a lower energy level than the 5p sublevel. Therefore, the 4d sublevel is filled after the 5s sublevel according to the aufbau principle.
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elect all the statements that correctly describe the bonding and geometry in the polyatomic ion SeCl5-.
The molecular geometry is square pyramidal.
There are 6 electron domains around the central atom.
There is one lone pair on the central atom.
Answers
As stated in the preceding statement Square pyramidal geometry describes the molecules.
An atom is what?An atom is made up of a core nucleus and one or maybe more electrons with negative charge that orbit it. The positively charged, comparatively hefty protons and neutrons that make up the nucleus may be present.
What are an example and an atom?The quantity of protons an atom has makes it distinct from other atoms. Consequently, a particle devoid of protons isn't just an atom. But even a single proton constitutes every atom (of hydrogen). Individual particles of something like the periodic table elements like sodium, plutonium, argon, among chlorine are examples of atoms.
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Charges of +2 µC and +3 µC are 4 mm from each other. Raina's group draws four diagrams trying to represent the
electrical force between the charges.
+2 μC +3 μC +2 μC +3 μC +2 μC +3 μC +2 μC +3 μC
W
Z
X
Y
Which diagram is correct?
O W
OX
ΟΥ
OZ
Mark this and return
Next
Submit
Answers
The correct diagram is W.
A diagram is often a -dimensional display that communicates the use of visual relationships. it is a simplified and dependent visual representation of ideas, ideas, buildings, family members, statistical records, anatomy, etc. it can be used for all elements of human activities to give an explanation for or illustrate a topic. example Diagrams are graphics that show a photo, or photographs, accompanied with the aid of either note, labels, or a legend, which will explain principles or techniques. Describe gadgets or locations.
Display how matters paintings, circulate or change. assist provide extra perception into the issue displayed. A diagram is a drawing that suggests the distinctive parts of something and the way they work collectively. three-Line diagram is part of the detailed design document. Used for manipulating designing circuit diagrams, managing circuits, segment sequencing, differential relay placing, and metering transformer connection. A records chart is a sort of diagram or graph, that organizes and represents a set of numerical or qualitative information.
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Question 5 (Mandatory) (1 point) For the reaction shown, how many grams of oxygen will be required to react with 15.5 grams of chromium?4 Cr + 3 O2 --------> 2 Cr2O3Question 5 options:A) 12.7 g O2B) 21.5 g O2C) 14.3 g O2D) 7.15 g O2Question 6 (Mandatory) (1 point) Consider the following combustion reaction: 2 C4H10 + 13 O2 ------------> 8 CO2 + 10 H2OIf 5.05 grams of C4H10 reacts with more than enough of O2, what is the maximum amount of CO2 that can be formed?Question 6 options:A) 122 g CO2B) 15.3 g CO2C) 0.956 g CO2D) 61.2 g CO2Question 7 (Mandatory) (1 point) Consider the reaction between HCl and O2: 4 HCl + O2 ---------------> 2 H2O + 2 Cl2Calculate the theoretical yield of H2O when 64 grams of HCl react with 19 grams of O2.Question 7 options:A) 16 g H2OB) 21 g H2OC) 32 g H2OD) 43 g H2OQuestion 8 (Mandatory) (1 point) Consider the following chemical reaction: 4 Al + 3 O2 ---------------> 2 Al2O3If 12.85 g of Al reacts completely with oxygen and 18.42 g of aluminum oxide is obtained, what is the percent yield of the reaction?Question 8 options:A) 24.28%B) 75.86%C) 65.91%D) 69.76%Question 9 (Mandatory) (1 point) When a mole of gaseous propane (C3H8) reacts completely with oxygen gas, 2044 kJ of energy is formed, along with gaseous carbon dioxide and water vapor. Which of the following equations is a correct representation of this thermochemical reaction?Question 9 options:A) C3H8(g) + O2(g) -----------> CO2(g) + H2O(g) ΔH = -2044 kJB) C3H8(g) + O2(g) -----------> CO2(g) + H2O(g) + 2044 kJC) C3H8(g) + 5 O2(g) + 2044 kJ -----------> 3 CO2(g) + 4 H2O(g) D) C3H8(g) + 5 O2(g) -----------> 3 CO2(g) + 4 H2O(g) + 2044 kJQuestion 10 (Mandatory) (1 point) The evaporation of water is endothermic: H2O(l) + 44.01 kJ --------> H2O(g) If 275 kJ of heat is absorbed, what mass of water will evaporate?Question 10 options:A) 0.347 gB) 2.18 x 105 gC) 113 gD) 6.25 gQuestion 11 (Mandatory) (1 point) Based on the following reaction: BaCl2(aq) + Na2SO4(aq) → BaSO4(s) + 2NaCl(aq) If a reaction mixture contains 4.16 g of BaCl2 and 3.30 g of Na2SO4 how many moles of the precipitate will be formed?Question 11 options:A) 0.178 molesB) 0.0200 molesC) 0.0241 molesD) 0.0278 molesQuestion 12 (Mandatory) (1 point) The following chemical equation, which is unbalanced, shows the reaction for the rusting of iron: Fe(s) + O2(g) → Fe2O3(s)How many moles of O2 are required to react completely with 1.396 g of Fe?Question 12 options:A) 0.00937 moles of O2.B) 0.0187 moles of O2.C) 0.00469 moles of O2.D) 0.0375 moles of O2.Question 13 (Mandatory) (1 point) A reaction mixture of 18.215 g Na2CO3 and 10.938 g HCl react according to the following balanced equation: Na2CO3 + 2HCl → 2NaCl + H2O + CO2What is the theoretical yield for NaCl, in moles, from this reaction mixture?Question 13 options:A) 0.300 moles of NaClB) 0.172 moles of NaClC) 0.150 moles of NaClD) 0.344 moles of NaClQuestion 14 (Mandatory) (1 point) A reaction mixture of 0.1400 g of NaOH and 0.1400 g HCl reacts according to the following equation: NaOH + HCl → NaCl + H2O ∆H = -31.0 kJWhat is the heat change, q, corresponding to this reaction mixture?Question 14 options:A) 0.109 JB) -0.119 JC) -119 JD) -109 JQuestion 15 (Mandatory) (1 point) A mass of 0.6539 g of zinc is dissolved in excess hydrochloric acid, according to the following equation: Zn(aq) + 2HCl(aq) → ZnCl2(aq) + H2(g) How many moles of Cl- ions are formed in the reaction?Question 15 options:A) 0.002 molesB) 0.02 molesC) 0.01 molesD) 0.1 moles
Answers
Question 5
Answer
D - 7.15 g O2
Explanation
Given:
Balanced chemical equation:
\(4Cr\text{ + 3O}_2\rightarrow2Cr_2O_3\)mass of Cr = 15.5 g
Required: mass of Oxygen
Solution:
Step 1: Find the moles of Cr
n = m/M where n is the number of moles, m is the mass and M is the molar mass
n = 15.5 g/51,9961g/mol
n = 0.298 mol
Step 2: Use stoichiometry to find the moles of O
The molar ratio between Cr and O is 4:3
Therefore the number of moles of O = 0.298 x (3/4) = 0.224 mol
Step 3: From the moles, we can find the mass of O
m = n x M
m = 0.224 x 31.998
m = 7.168 g which is closer to D = 7.15 g
hello, do you think you know the order of this?
Answers
Answer:
1. A
2. B
3. D
4. C
Explanation:
Just trust me. Good luck on your test! (I go to K12 as well.)
name and define the quantity represented by H
Answers
Answer:
Molar enthalpy change, the enthalpy change for one mole of a pure substance
Explanation: i think
Which of the following has mechanical energy? (5 points)
Car battery
Compressed spring
Glowing incandescent lightbulb
Nucleus of uranium atom
Answers
Answer:
compressed spring
Explanation:
42. Balance the equation below. What is the coefficient for HCI?
Help me please don’t answer then delete I will report u
Answers
Answer:
Mg + 2HCl ⇒ MgCl₂ + H₂Coefficient of HCl = 2Explanation:
Equation (given) :
Mg + HCl ⇒ MgCl₂ + H₂Compare the LHS and RHS :
On the left side, there are only single atoms of H and Cl, whereas there are 2 of each on the right sideAs HCl is a single compound on the left, multiply HCl into 2 to balance the reactionCoefficient of HCl = 2Balanced Equation :
Mg + 2HCl ⇒ MgCl₂ + H₂Determine the mass of zirconium_______________, silicon__________________, and oxygen________________, found in 0.3384 mol of zircon, ZrSiO4, a semiprecious stone. Your answer must have the correct number of significant figures.Enter the number only, with no units.
Answers
1) Determine the mass of zirconium
Convert moles of zircon into moles of zirconium
\(\text{molesofZr}=0.3384molesofZrSiO_4\cdot\frac{1\text{molofZr}}{1molofZrSiO_4}=0.3384\text{molesofZr}\)Convert moles of zirconium into mass of zirconium (g)
\(\text{gramsofZr}=0.3384\text{molesZr}\cdot\frac{91.224\text{ g Zr}}{1\text{molofZr}}=30.87\text{ g Zr}\)2) Determine the mass of Silicon
Convert moles of zircon into moles of silicon
\(\text{molesofSi}=0.3384molesofZrSiO_4\cdot\frac{1\text{molofSi}}{1molofZrSiO_4}=0.3384\text{molesofSi}\)Convert moles of silicon into mass of silicon (g)
\(\text{gramsofSi}=0.3384\text{molesofSi}\cdot\frac{28.085\text{ g of Si}}{1\text{molofSi}}=9.504\text{ g Si}\)3) Determine the mass of Oxygen
Convert moles of zircon into moles of oxygen
\(\text{molesofO}=0.3384molesofZrSiO_4\cdot\frac{4\text{molofO}}{1molofZrSiO_4}=1.3536\text{molesofO}\)Convert moles of oxygen into mass of oxygen
\(\text{gramsofO}=1.3536\text{molesofO}\cdot\frac{15.999\text{ g O}}{1\text{mol of O}}=21.66gO\)The mass of zirconium is 30.87 g
The mass of silicon is 9.504 g
The mass of oxygen is 21.66 g
Can someone please help me with this question
Answers
Answer:
the second one I think...
Answer:
The answer is the first one.
Acceleration is the change of velocity
Velocity is another term for speed with direction.
Which involves a chemical change?
1.separating hydrogen and oxygen from water
2.evaporating sugar from sweetened water
3.filtering sand from water
4.distilling pure water from salt water
Answers
Answer:
1
Explanation:
because you are changing the chemical makeup of the water by pulling out the two chemicals
A student was assigned to take water samples from a lake near his home he measured the Ph of one of the water samples to be 6.0. which of the following best describes this sample of water
Highly acidic
Slightly acidic
Highly basic
Slightly basic
Answers
Answer:
B. Slightly acidic
Explanation:
pH can be defined as a measure of the negative logarithmic concentration of hydrogen ion (H+) in an aqueous solution.
Basically, the pH scale is used to measure the level of acidity or basicity of an aqueous solution based on a scale of 0 to 14.
An acidic solution has a pH lower than 7 (0 - 6), a basic solution has a pH higher than 7 (7 - 14) and a neutral solution has a pH of exactly 7.
In this scenario, a student was assigned to take water samples from a lake near his home he measured the Ph of one of the water samples to be 6.0. Therefore, this sample of water can be said to be slightly acidic its pH is slightly below 7.
Which system brings warm air up from low latitudes over land or sea?
Answers
I think the term you are looking for is
-> Tropical Air Masses
They only form at low latitudes and these masses of air bring the warm air up and over land or across the sea.
Have a nice day!
I hope this is what you are looking for, but if not - comment! I will edit and update my answer accordingly.
- Heather
Click on the diagram to choose which atom is more reactive.
Answers
Answer:
Second graph is more reactive.
Explanation:
I just did the lesson myself, chose the first graph, and obviously got it wrong.
Therefore I can tell you with 100% certainty that the correct answer is graph #2 in this case. Hope this helps.
State three pieces of evidence from the diagram which indicate that the plant is pollinated by wind. ( 3 marks)
Answers
Your image is saying "Can't load image on this device."
There are 12 inches in 1 foot and 2.54cm in 1 inch. How many feet are in 325 cm?
Answers
Answer:
27.0833 feet
Explanation:
Impacts of Erosion and Deposition
design a solution to a major erosion or deposition issue on a school campus
Answers
Answer: Plants
Explanation:
One great and natural option to help to control erosion on slopes is by using plants. The roots of plants act as natural ways to hold in the round and soil and anchor the soil.
A lake that is used as a water source receives a lot of acid rain one year. Which of the following is an impact this will have?(1 point)
The lake water will have a lower pH which will cause high levels of fog in the area, making it hard to see.
The lake water will have a higher pH which will make it harder for plants round the lake to access nutrients.
The lake water will have a higher pH which will damage the boats that people store on the docks on the lake.
The lake water will have a lower pH which will damage the plants and animals living in the water.
Answers
The lake water will have a lower pH which will damage the plants and animals living in the water is the impact the acid rain will have on the lake and is denoted as option D.
What is Acid rain?This is the type of rain which has acidic properties due to the increase in the number of hydrogen ions and is common in industrial areas where chemicals are used for their operation.
This type of rain have different effects on water bodies such as lakes such that the lowering of the pH leads to the damage of the plants and animals living in the water.
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Answer: water
Explanation: 123
Un Hidrocarburo de peso molecuar 42g/mol contiene un 85,7 de carbono, ¿cual es la formula empirica y molecular?
Answers
Answer:
1 respuesta. fórmula empírica = CH2
Explanation:
Translatation: 1 Answer. empirical formula = CH2
Scientists are studying different jackets made for extremely cold, snowy weather. They are trying to find jackets that are warm but also thin enough to allow for natural bodily movement.
Answers
Scientists are studying different jackets made for extremely react cold, snowy weather. They are trying to find jackets that are warm but also thin enough to allow for natural bodily movement.
To stay warm in extremely cold, snowy weather, you need to wear a jacket that is warm and thick enough to protect you from the cold. However, it is also important that the jacket is thin enough to allow for natural bodily movement. This is because if the jacket is too thick, it can restrict your movement and make it difficult to walk or perform other tasks.
The reason behind this is to find jackets that are warm enough to keep people safe in such extreme weather conditions and at the same time thin enough to allow for natural bodily movement. This is because a jacket that is too thick can restrict your movement and make it difficult to walk or perform other tasks. This is why researchers are exploring different materials and designs for making such jackets.
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Which pair of atoms can form an ionic bond?
A.
potassium (K) and fluorine (F)
B.
sodium (Na) and neon (Ne)
C.
fluorine (F) and chlorine (Cl)
D.
sodium (Na) and potassium (K)
Answers
Answer:
neon
Explanation:
Why does the pressure inside a container of gas increase if more gas is added to the container?
Why does the pressure inside a container of gas increase if more gas is added to the container?
There are greater differences in the distances between the molecules.
There is a corresponding increase in the number of molecules striking the walls of the container per unit time.
There is a increase in the force of the collisions between the molecules and the walls of the container.
Answers
The pressure inside a container of gas increases if more gas is added to the container due to the increase in the number of molecules striking the walls of the container per unit time and the increase in the force of the collisions between the molecules and the walls of the container.
Pressure is defined as force per unit area and is usually measured in atmospheres (atm), millimeters of mercury (mmHg), or kilopascals (kPa).The molecules of gas in a container are in constant motion and collide with the walls of the container. When more gas is added to the container, the molecules have less space to move around and collide with the walls more frequently.
This leads to an increase in the number of collisions per unit time and therefore an increase in the force per unit area exerted on the walls of the container. This increase in force leads to an increase in pressure inside the container.In summary, the pressure inside a container of gas increases if more gas is added to the container due to an increase in the number of collisions and the force of the collisions between the molecules and the walls of the container.
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How many ml of .50 M NaOH are required to completely titration 15.0 mL of .20 M HNO_3 solution
Answers
150ml of 0.50 M NaOH are required to completely titration, 15.0 mL of .20 M HNO₃ solution.
What is titration ?To determine the concentration of an identified analyte, titration is a typical laboratory technique for quantitative chemical analysis. A standard solution with a known concentration and volume is prepared as the reagent, also known as the titrant or titrator.
The equivalence point, or the point at which chemically equivalent amounts of the reactants have been combined, is to be detected by the titration. The stoichiometry of the reaction determines how many reactants have been combined at the equivalence point.
Thus, 150ml of 0.50 M NaOH are required to completely titration, 15.0 mL of .20 M HNO₃ solution.
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Compare and contrast Dalton's atomic theory with modern atomic theory.
Answers
Answer:
Postulates of Dalton's Atomic Theory:
1) Atoms can neither be created nor destroyed.
2) During chemical reaction, atoms combine or separate or re-arrange. They combine in simple ratios.
3) All elements are composed of the indivisible particles called atoms.
4) Atoms of a particular element are identical. They have the same mass and volume.
Postulates of modern atomic theory:
1) All matter is composed of atoms.
2) Atoms consist of protons, electrons and neutrons.
3) Atoms of an element may differ in masses. (as in isotopes)
4) The ratio in which elements combine may not be simple.
Similarities:
1) All elements/matter are/is composed of atoms.
2) Atoms can neither be created nor destroyed.
3) During chemical reactions, atom combine or separate or rearrange.
Differences:
1) Dalton's theory said that atoms are indivisible particles but modern theory denies it and calls atom a divisible particle consisting of sub-atomic particles, protons, electrons and neutrons.
2) Dalton's theory said that atoms of the same element have same mass and volume but according to modern theory, it is said that atoms of the same element can differ in mass (as in isotopes).
3) Dalton said that atoms combine in simple ratio but modern theory denies it.
\(\rule[225]{225}{2}\)
Hope this helped!
~AH1807Mr. Romeo wants to make a solution of NaOH. He measures out 97.68 grams and puts it into 3 liters
What is the molarity of the solution he created? Round to 2 Decimal points
Answers
Answer: Molarity of the solution is 0.813 M.
Explanation:
Given : Mass of NaOH = 97.68 g
Volume of solution = 3 L
The molar mass of NaOH is 39.99 g/mol. Hence, moles of NaOH are calculated as follows.
\(No. of moles = \frac{mass}{molar mass}\\= \frac{97.68 g}{39.99 g/mol}\\= 2.44 mol\)
Molarity is the number of moles of solute present in a liter of solution. Therefore, molarity of given solution is calculated as follows.
\(Molarity = \frac{no. of moles of solute}{Volume (in L)}\\= \frac{2.44 mol}{3 L}\\= 0.813 M\)
Thus, we can conclude that molarity of the solution is 0.813 M.
How many molecules are in 0.25 mole of CO?
A. 6.0 x 1023
B. 1.5 X 1023
C. 9.0 x 1023
D. 3.0 x 1023
Answers
Rounded to the nearest significant figure, \(\rm 1.5 \times 10^{23 }\) molecules are in 0.25 mole of \(\rm CO\). The correct answer is option B.
A mole is defined as the amount of a substance that contains exactly \(\ \rm 6.022 \times 10^{23}\) 'elementary entities' of the given substance.
To calculate the number of molecules in 0.25 mole of CO, we can use Avogadro's number, which is the number of particles (atoms, molecules, etc.) in one mole of a substance. Avogadro's number is approximately \(\ \rm 6.022 \times 10^{23}\) particles per mole.
Number of molecules = Number of moles x Avogadro's number
Substituting the given values, we get:
Number of molecules = 0.25 mole x \(\ \rm 6.022 \times 10^{23}\) molecules/mole
= \(\rm 1.5 \times 10^{23 }\)
Therefore, the number of molecules in 0.25 mole of CO is approximately \(\rm 1.5 \times 10^{23 }\) molecules. Option B is the correct answer.
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How does heat enhance the rate of chemical reaction? Explain in short.
Answers
Answer: the heat is rapidly changing
Explanation: as the heat continues to rapidly change so does the chemical as it also starts to change, so in a way you could use the example of a skateboard moving. This is because theres also friction in the skateboard which is made from the two things moving together and the heat is slowly increasing causing a reaction to the skateboard wheels so in a way it can cause more rapid changes
With the increase in heat or temperature, the rate of reaction will increase as more molcules will get kinetic energy for effective collisions.
What is the rate of the chemical reaction?The rate of reaction can be d as defined the speed at which the products are fromed from the reactants. The rate of a reaction provides information on how much time under which a chemical reaction can be completed.
The rate of a chemical reaction can be defined as the speed of the conversion of the reactants into products with time. Some reactions are instantaneous, while some chemical reactions take time to achieve the final equilibrium.
In some reactions, a catalyst can be used to increase the rate of the reaction. The catalyst provides the speed to the reaction in both forward and backward reactions by lowering the activation energy.
The pressure of the gaseous reactants increases, and the concentration of gases results in an increase in the rate of reaction. With an increase in the temperature, the average kinetic energy of the reactant molcules will be raised.
Therefore, more molecules will go under effective collisions. Therefore, the rate of reaction will be increased.
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