Answer:
Explanation:
If you look at an atom as a whole, it is electrically neutral and possesses no overall charge. The nucleus consists of Protons and neutrons, Protons have a positive charge and neutrons have no charge on them.
Hence, the nucleus of an atom is positively charged and is generally surrounded by one or more electrons.
The electrons on the other hand have a negative charge on them.
The sign convention for proton (+1), neutron(0) and electron(-1). The nucleus is very heavy but is very small compared to the overall size of an atom.
An atom consists of a positively charged nucleus, surrounded by one or more negatively charged particles called electrons. The positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral. I hope this helped.
how shielding effect the ionization energy??
A tortoise uses its eyes to see something moving nearby. The tortoise feels threatened by the movement. It pulls its head, legs, and tail into its shell. The tortoise's shell is hard and thick. This helps protect the turtle's soft body parts from any danger. Which of these describes a response of the tortoise to sensory information processed by its brain?
A. The tortoises shell is hard and thick.
B. The tortoise pulls its head, legs, and tail into its shell.
C. The tortoises soft body parts are protected from any danger.
D. The tortoise uses its eyes to see something moving nearby.
The oxidation number of " Z" in sodiumchromite, H₂ZO4, is
Answer:
[tex]Z\text{ = +6}[/tex]Explanation:
Here, we want to get the value of the oxidation number of Z
Generally, hydrogen has an oxidation number of +1, while oxygen has an oxidation number of -2
The total oxidation number is zero
Thus:
[tex]\begin{gathered} 2(+1)\text{ + Z + 4\lparen-2\rparen = 0} \\ 2+Z-8\text{ = 0} \\ Z-6\text{ = 0} \\ Z\text{ = +6} \end{gathered}[/tex]What is the wavelength of a wave with a frequency of 105.7 x 10^6 Hz *
our answer
2.83 lamda is the wavelength of a wave with a frequency of 105.7 x10^6 Hz in here.
What is wavelength , frequency, and what is the wavelength?Wavelength is the measure of the distance of the light wave in a medium provided or the target object is emitting light in.Frequency is generally the number of oscillations per second and is in inverse relation with wavelength .Here in this question is given the frequency of the wave 105.7 x 10^6 Hz and the wavelength is asked.We will use the equation c= frequency x lamda , and which will imply wavelength = speed of light / frequency = 3 x 10^8 / 105.7 x10^6= 2.83 Lambda.Hence the wavelength of the wave with frequency 105.7 x 10^6 is 2.83 lamda.To know more about wavelength visit:
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Find the volume of oxygen that has a mass of 250. 0 g
NEED HELP ASAP PLEASE!!!
At STP, the volume of oxygen of mass 250g is found to be 175mL.
Volume is the amount of space occupied by an item or substance. Volume is a measurement of how much 3-dimensional space an object occupies. Volume is the measurement of a limited quantity of area at a specific end.
Mass is a measurement of the quantity of matter in an item or substance. Mass is the physical quantity that represents the amount of matter in an object's body. The amount of weight accommodated in an item or stuff is measured in mass.
Density - The amount of space taken up by an item or substance (its volume) in proportion to the amount of matter in that thing or substance (its mass).
Given:
Mass = 250g = 0.25kg
Density at STP = 1.4291g/L
To find:
Volume = ?
Formula:
Density = Mass / Volume
Calculations:
Volume = Mass / Density
Volume = 0.25 / 1.4291
Volume = 0.175L
Volume = 175mL
Result:
The volume of oxygen of mass 250g is found to be 175mL at STP.
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1. Starting with a 0. 1525 m hcl stock solution, three standard solutions are prepared by sequentially diluting 5. 00 ml of each solution to 100. 0 ml. What is the concentration of each solution?.
Each solution has a concentration of 7.625 x 103 m, 3.8125 x 104 m, and 1.90625 x 105 m, respectively.
Dilution is the process of lowering a sample's concentration by incorporating more solvent, according to its definition. The following is the dilution formula.
C₁V₁ = C₂V₂
where C1 is the sample's initial concentration.
V1 is the initial sample volume.
After dilution, the ultimate concentration is C2.
After dilution, the ultimate total volume is V2.
Calculate the concentration of the diluted solution by entering the numbers into the formula.
first common answer
C₁V₁ = C₂V₂
0. 1525 m(5.00 ml) = C₂(100.0 ml) (100.0 ml)
C₂ = 7.625 x 10⁻³ m
Second common solution
C₁V₁ = C₂V₂
7.625 x 10⁻³ m(5.00 ml) = C₂ (100.0 ml)
C₂ = 3.8125 x 10⁻⁴ m
Third accepted option
C₁V₁ = C₂V₂
3.8125 x 10⁻⁴ m(5.00 ml) = C₂(100.0 ml) (100.0 ml)
C₂ = 1.90625 x 10⁻⁵ m
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How are cellular respiration and photosynthesis similar?
Both processes break down glucose.
Both processes create food for organisms.
Both processes produce waste.
Both processes take place in chloroplasts.
Cellular respiration and photosynthesis similar is both processes break down glucose
Photosynthesis converts carbon dioxide and water into oxygen and glucose and glucose is used as food by the plant and oxygen in a byproduct whereas cellular respiration converts oxygen and glucose into water and carbon dioxide and both processes break down glucose and both are processes within the cell which make chemical energy available for life
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What are the products from the following reactants: Na₂O + Ca →
A. CaO + Na
B.Ca₂O + Na₂
C.CaO₂ + Na
D. CaO + Na₂
please help
what other chemical could be used to make barium sulfate
Answer:
Barium sulfate, BaSO4, is made by reacting barium hydroxide and other barium sources with sulfuric acid and has a long history as a translucent white pigment.
a 25.0 ml sample of 0.100 m hbr solution is titrated with 0.050 m naoh solution. what is the ph after 25.0 ml of the naoh solution have been added?
The ph after 25.0 ml of the naoh solution have been added is 1.222.
You are aware that the balanced chemical equation states that sodium hydroxide and hydrochloric acid balance each other out in a 1:1 mole ratio.
NaOH (l) + HCl (l) = NaCl (l) + H2O (l)
As a result, equal amounts of sodium hydroxide and hydrochloric acid must be used to completely neutralize a substance, producing a neutral solution with a pH of 7 at ambient temperature.
Although the molarities of your two solutions are equivalent, the hydrochloric acid solution has a volume of 100 mL divided by 25.0 mL, which equals four.
[tex][H3O+]=(75⋅0.100103).moles H3O+125⋅103.L=(75⋅0.100125)mol L−1This means that you havepH=−log(75⋅0.100125)=1.222−−−−−[/tex]
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To calculate the heat absorbed or released, you need to measure which of the following?
A) Specific heat, change in temperature, and time to heat.
B) Mass, specific heat, and change in temperature.
C) Mass, volume, and change in temperature.
D) Mass, specific heat, and time to heat.
In case of exothermic or endothermic reactions where heat is absorbed or released there is a need to measure specific heat, change in temperature and time to heat.
What are exothermic reactions?An exothermic reaction is defined as a chemical reaction which involves release of energy in the form of light,heat .In these reactions, energy is transferred from system to surroundings rather than taking energy from surroundings into system as in endothermic reactions.
In an exothermic reaction,change in enthalpy is negative.Therefore, it can be inferred that net amount of energy which is required to start the exothermic reaction is less than the net amount which is released by the reaction.
Examples of exothermic reactions are combustion reactions, detonation of nitroglycerin , neutralization reactions and nuclear fission.
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Which physical change is endothermic?
A) CO2(l) → CO2(s)
B) CO2(g) → CO2(s)
C) CO2(g) → CO2(l)
D) CO2(s) → CO2(g)
Physical change of a substance involves the change in phase or state. The physical change which is endothermic is, conversion of solid carbon to gaseous carbon.
What is endothermic reaction?Endothermic reactions are those which absorbs heat energy to give the products. Thus heat is taken into the reaction system hence the name endothermic.
In exothermic reactions, the heat energy is released by the reaction system, where the heat is exiting hence the name exothermic.
When solids changes to gaseous state, the tightly packed molecules in the solid state requires much energy to move apart and to overcome the intermolecular forces of attraction.
Liquid to gas does not require these much energy and gas to liquid evolves energy out. Therefore, the physical change given here which is endothermic is conversion of solid carbon dioxide to gas carbon dioxide.
Hence, option D is correct.
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If something is renewable, then it can be used carelessly. True or false
Which is the balanced version of the half-reaction below?
H₂S → S + H+
OA. H₂S → S+H* + e
OB. H₂S + 2e → S + 2H+
OC. H₂S →S + 2H*
OD. H₂S →S + 2H+ + 2e
The balanced version of the half reaction is H2S - S + 2H+ , this is how we balance half reactions.
What is half reaction and how the half reaction is balanced?We must have studied redox reaction , which is the reaction in which one component of reactant undergoes oxidation and other undergoes reduction.Half reaction is either only the oxidation or only the reduction of the redox reaction.Whenever we balance a equation or reaction we always try to balance by equalizing the coefficients of the components .Here in this question in which only half reaction is given to balance , there will be one sulphur and two hydrogen in the product .To know more about half-reaction visit:
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use the clean 25 ml graduated cylinder to accurately measure 10.0 ml of 2m naoh from the dropper bottle. when nearing 10.0 ml mark, add drops slowly to ensure a measurement of exactly 10.0 ml.
1.enthalpy ΔH = -45.1872 Kj/mol
2.enthalpy ΔH = -2.092 Kj/mol
3.enthalpy ΔH = -13.888 Kj/mol
A thermodynamic system's internal energy and the product of its pressure and volume are added to form enthalpy, which is one of the system's properties. It is a state function that is frequently used to monitor chemical, biological, and physical systems at a constant pressure that is conveniently given by the sizable surrounding environment. The labor necessary to determine the system's physical dimensions, or to make room for it by displacing its surrounds, is expressed by the pressure-volume phrase. Under typical conditions, the pressure-volume term is very small for solids and liquids and moderately small for gases. As a result, in chemical systems, enthalpy serves as a stand-in for energy; bond, lattice, solvation, and other concepts referred to as "energies" in chemistry are actually differences in enthalpy.
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NASA communicates with the Space Shuttle and International Space Station using Ku-band microwave radio. Suppose NASA transmits a microwave signal to the Space Shuttle using radio waves with a frequency of . Calculate the wavelength of these radio waves.
Be sure your answer has the correct number of significant digits.
The wavelength of these radio waves with a frequency 18GHz is equal to 0.0167m.
What is microwave communication?Microwave transmission is the method of transmission of information by electromagnetic waves that lie in the microwave range (1 m - 1 mm) of the electromagnetic spectrum. Microwave signals are limited to the line of sight, so long-distance transmission using these signals needs a series of repeaters to create a microwave relay network.
The relationship between wavelength (λ) and frequency (ν) can be expressed as follow:
λ = c/ν
Given, the frequency of the radio wave = 18GHz
The frequency in (per second) = 18 × 10⁹ s⁻¹
The wavelength of the radiowaves, λ = c/ν
where c is the speed of light and has a value of 3× 10⁸ m/s.
λ = c/ν = 3× 10⁸ m/s./ 18 × 10⁹ s⁻¹
λ = 0.0167 m
Therefore, the wavelength of these radio waves is equal to 0.0167m.
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Your question was incomplete, most probably the complete question was,
NASA communicates with the Space Shuttle and International Space Station using Ku-band microwave radio. Suppose NASA transmits a microwave signal to the Space Shuttle using radio waves with a frequency of 18GHz. Calculate the wavelength of these radio waves.
Be sure your answer has the correct number of significant digits.
Which part of the hydrocarbon name tells you the bonds found between carbon atoms in the molecule?
A.the prefix
B. the ending
C. the leading numbers
D. the ending numbers
The ending or suffix of the hydrocarbon name tells the bonds found between carbon atoms in the molecule. Therefore, option (B) is correct.
What are hydrocarbons?Hydrocarbons are entirely made up of only two kinds of atoms which are carbon and hydrogen. Hydrocarbons are typically colorless gases and weak odors. Hydrocarbons can be relatively complex structures and can be classified into four subcategories, alkanes, alkenes, alkynes, and aromatic hydrocarbons.
Hydrocarbons such as propane and butane are used for commercial fuel purposes in the form of LPG and the molecular formula for the compounds is CxHy.
In the nomenclature of hydrocarbons, the suffix of the name indicates what type of bond is present between the atoms. If all carbon atoms have a single covalent bonds then the suffix is "ane". If one or more carbon-carbon double bonds are present then the suffix is "ene". If the triple bond is present then the suffix in the name of the hydrocarbon is "yne".
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consider a gas cylinder containing 0.250 moles of an ideal gas in a volume of 6.00 l with a pressure of 1.00 atm. the cylinder is surrounded by a constant temperature bath at 292.0 k. with an external pressure of 3.00 atm, the cylinder is compressed to 2.00 l. calculate the w(gas) for this compression process, in j.
The work done by the isothermal compression of the gas is -666.7 J.
What is the work done by the compression of the gas in an isothermal process?The work done by the compression of a gas in an isothermal process or at constant temperature is given by the formula below:
Work done, W = nRT ln(Vf / Vi)
where;
Vi = final volume of gas Vf = initial volume of gasFrom the data provided:
number of moles, n = 0.250 moles
Molar gas constant, R = 8.314 J/K/mol
Temperature, T = 292 K
Vf = 2.00 L
Vi = 6.00 L
W = 0.25 * 8.314 * 292 * ln(2/6)
Work done = -666.7 J
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when 35.0kg of sio2 react with 25.3kg of c, 14.4kg of si are recovered. what is the percent yield for the reaction?
when 35.0kg of sio2 react with 25.3kg of c, 14.4kg of si are recovered.
The percent yield for the reaction is 8.8012%
sio2 + 2c = si + co
moles of sio2 = 35*[tex]10^{3}[/tex] / 600.02 = 582.503mol
moles of c = 25*[tex]10^{3}[/tex] / 12 = 2.1083 kcal
yield = moles of si produced / mole of sio2 used
= 512.72/582.36 * 100
= 8.8012%
chemical reaction is a process in which one or more substances the reactants—are changed into one or more additional substances the products. Chemical elements and compounds are both substances. To produce various compounds as products, a chemical reaction rearranges the atoms that make up the reactants.
Technology, culture, and life itself are all influenced by chemical interactions. Numerous activities that involve chemical reactions have been known and used for thousands of years, including burning fuels, smelting iron, creating glass and pottery, brewing beer, and producing wine and cheese. Numerous intricate processes that take place in all living systems, as well as the Earth's geology, atmosphere, and oceans, include chemical interactions.
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what charge ion would be expected for an element that has these ionization energies? ie1 (kj/mol) 500 ie2 (kj/mol) 1000 ie3 (kj/mol) 9000 ie4 (kj/mol) 10,000 ie5 (kj/mol) 11,020 ie6 (kj/mol) 13.160 ie7 (kj/mol) 17870 ie8 (kj/mol) 23600
500 ie2 (kj/mol) would be expected for an element.
The value of IE2 (second ionization energy) is 16 times more than IE1(first ionization energy). So, the elements easily release outer most one electron as the IE1 value is low. But, it is very reluctant to release second electron which reflected in the IE2 value. Therefore, the element will form 1+ ion.
What is ionization energy?
Ionization energy may be defined simply as a measurement of how difficult it is to remove an electron from an atom or ion or of an atom's or ion's propensity to give up an electron. Usually, when a chemical species is in its ground state, an electron is lost.
As an alternative, we might say that ionization or ionization energy is a measurement of the intensity of the attractive forces that hold an electron in a certain location.
Therefore, 500 ie2 (kj/mol) is the answer.
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HELP ASAP WILL MARK BRAINLIEST
Consider the reaction:
A + 3B → 2C
How does the reaction rate of B compare to the reaction rate of C?
A The rate of B is -½ the rate of C.
B The rate of B is -3/2 the rate of C.
C The rate of B is -⅔ the rate of C.
D The rate of B is -⅓ the rate of C.
To solve this we need to have knowledge of differential rate law which relate the rate to the concentration and time The option B is correct option.
What is differential rate law?A differential rate law represents the rate of a reaction . According to this rate is directly proportional to changes in the concentration of reactants and inversely proportional to specific interval of time. There is another expression of rate law which is integrated rate law which is just opposite of differential rate law
The given equation is
[tex]A+3B\rightarrow2C[/tex]
Rate of B= rate of C
[tex]\frac{1}{3}d\frac{[B]}{dt} =\frac{1}{2}d\frac{[C]}{dt}[/tex]
[tex]d\frac{[B]}{dt} =\frac{3}{2}d\frac{[C]}{dt}[/tex]
Thus option B is correct option.
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what is the net ionic equation for CrCl3 + Ba(NO3)2
Answer:
[tex]3Ba^{2+}\text{ + 6Cl}^-\text{ }\rightarrow\text{ 3BaCl}_{2(s)}[/tex]Explanation:
Here, we want to write the net ionic equation
We start by writing the complete equation of reaction:
[tex]2CrCl_3\text{ + 3Ba\lparen NO}_3)\placeholder{⬚}_2\rightarrow3BaCl_{2(s)}\text{ + 2Cr\lparen NO}_3)\placeholder{⬚}_3[/tex]Now, we write out the ions as follows:
[tex]2Cr^{3+}\text{ + 6Cl}^-\text{ + 3Ba}^{2+}\text{ + 3NO}_3^-\text{ }\rightarrow\text{ 3BaCl}_2\text{ + 2Cr}^{3+}\text{ + 3NO}_3^-[/tex]The Chromium and Nitrate ions are spectator ions
Thus, we have:
[tex]3Ba^{2+}\text{ + 6Cl}^-\text{ }\rightarrow\text{ 3BaCl}_2[/tex]The group that fits neatly onto the end of the table, the
____ are unwilling to react with other elements
O alkaline earth metals
O halogens
O noble gases
O alkali
Using the average atomic masses for each of the following elements calculate the mass in AMU of each of the following samples
Calculate the mass, in amu, of 278 atoms of Li.
1) We need to find Li (Lithium) in the periodic table.
1) The atomic mass of Lithium is 6.94 u.
[tex]\text{The mass of Lithium sample=}\frac{6.94\text{ u of Lithium}}{1\text{ mole of Lithium}}\cdot\frac{1\text{ mole of Lithium}}{6.022\cdot10^{23}\text{ atoms of Lithium}}[/tex]2) We can cancel some units and rearrange the equation.
[tex]\text{Lithium sample = }\frac{6.94\text{ u of Lithium}}{6.022\cdot10^{23}\text{ atoms of Lithium}}[/tex]3) Multiply the equation above by the number of atoms
[tex]\text{Lithium Sample = }\frac{6.94\text{ u of Lithium}}{6.022\cdot10^{23}\text{ atoms of Lithium}}\cdot\frac{278\text{ atoms of Lithium}}{\square}\text{ = 3.20}\cdot10^{-21}\text{ u of Lithium}[/tex]The mass of 278 atoms of Lithium is 3.20*10^-21 u
Pick the odd one out -:
milk, ink, salt and carbon dioxide
Answer:
salt
Explanation:
cause salt is a solid item
A sample of natural sulfur consists of three isotopes:
95.0% sulfur-32 (31.97 amu)
0.75% sulfur-33 (32.97 amu)
4.21% sulfur-34 (33.96 amu)
Based on this information, what is the average molar mass of sulfur?
The average molar mass of sulfur is 32.84g/mol
The average atomic mass of a chemical element is calculated by taking into account the atomic masses of its naturally occurring isotopes and their respective abundances
Here given data is natural sulfur consists of three isotopes :
95.0% sulfur-32 = 31.97 amu
0.75% sulfur-33 = 32.97 amu
4.21% sulfur-34 = 33.96 amu
So, we have to find average molar mass of the sulfur = ?
Formula for average molar mass = ∑i × isotope i × abundance i
³²S = 95.0% abundance = 31.97 amu
³³S = 0.75% abundance = 32.97 amu
³⁴S = 4.21% abundance = 33.96 amu
This means that average molar mass of sulfur is
Average molar mass = 31.97 amu×95.0 + 32.97 amu× 0.75 + 33.96 amu×4.21
Average molar mass = 32.84g/mol
Average molar mass of sulfur is 32.84g/mol
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To eliminate the y-terms and solve for x in the fewest steps, by which constants should the equations be multiplied by before adding the equations together?
First Equation: 5x − 4y = 28
Second equation: 3x - 9y = 30
The first equation should be multiplied by 3 and the second equation by 5.
The first equation should be multiplied by 3 and the second equation by −5.
The first equation should be multiplied by 9 and the second equation by 4.
The first equation should be multiplied by 9 and the second equation by −4.
Answer: the answer is D) The first equation should be multiplied by 9 and the second equation by −4.
Explanation:edge 2022
an elephant of mass 500kg stands on the ground.each foot has an area of 0.08m2.calculate the pressure exerted on the ground.g=10m/s2.
If an elephant of mass 500kg stands on the ground, each foot has an area of 0.08m2, the pressure exerted on ground is 15,625 Pa.
What is pressure?In the physical sciences, pressure is defined as the perpendicular force per unit area or the stress at a point within a confined fluid. A 42-pound box with a bottom area of 84 square inches will press down on a surface with a pressure equal to the force divided by the area over which it is applied, or half a pound per square inch.
Atmospheric pressure, which at sea level is roughly 15 pounds per square inch, is the weight of the atmosphere pressing down on each unit area of the Earth's surface. One pascal is equal to one newton per square meter when expressed in SI units, which is how pressure is calculated. Nearly 100,000 pascals of atmospheric pressure are present.
We have given that mass is 500kg and area of each leg is 0.08m²
The formula for Pressure is
Pressure = Force/Area
Let us find the weight first
⇒ weight = mass × g
= 500kg × 10N/kg
= 5000N
Total contact area = 0.08m² × 4
= 0.32m²
Finally, we will calculate the pressure
⇒ Pressure = Force/Area
= 5000N/0.32m²
= 15625 Pa
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write a net iconic equation for the reaction that occurs when strong base (use oh−oh− for strong base) is added to a buffer made from acetic acid (ch3coohch3cooh) and sodium acetate (ch3coonach3coona)
The net ionic reaction equation for the change that happens when strong base is added to this buffer looks like this:
CH₃COOH(aq) + OH⁻(aq) → CH₃COO⁻(aq) + H₂O(l)
To solve this problem, we need to consider what will happen when a strong base is added to a buffer solution made from acetic acid and sodium acetate. All buffers have a basic and an acidic component. In this one the acidic component is, obviously, acetic acid, a weak acid.
When making a buffer based on a weak acid, the basic component is usually a salt of that acid, in this case, sodium acetate.
When a strong base is added to the buffer, it will dissociate to yield the metal cation and the OH⁻ anion. The basic OH⁻ anion will interact with the acidic component, neutralizing it and forming the acetate ion and water.
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a substance that helps a reaction to take place, but does not participate in the reaction is called a(n) . activation energy reactant catalyst product
The correct answer is option C: Catalyst
A substance that helps a reaction to take place, but does not participate in the reaction is called a catalyst.
In Chemistry, a catalyst is defined as a substance that increases the rate of a chemical reaction without itself undergoing any changes. This process is called catalysis.
There are 3 different types of catalysts: enzymatic, homogeneous, and heterogeneous.
The catalytic substance remains unchanged and does not consume during the reaction, Their only job is to speed up the reaction by breaking bonds and saving time and energy.
For example, during the commercial preparation of ammonia also called the 'Haber process' iron is added as a catalyst to accelerate the reaction rate.
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