Many heterogeneous catalysts are deposited on high-surface area supports. Why?
Answers
For a number of reasons, heterogeneous catalysts are frequently placed on high-surface-area supports. First off, more catalytic sites are possible thanks to high-surface-area supports' huge active surface area for catalyst deposition.
This increases the catalyst's overall activity and efficiency. Second, the high-surface-area supports help the catalyst disperse more effectively, avoiding agglomeration and ensuring even distribution. This maximizes the catalyst's contact time with the reactant molecules, improving the likelihood of catalytic interactions. The supports can also give the catalyst structural stability, avoiding the deactivation or deterioration of the catalyst. Further enhancing catalytic activity or selectivity may be specific aspects of the high-surface-area supports, such as pore architectures or surface functions.
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Related Questions
When a bag containing mothballs is opened, mothballs’ molecules go through the following change.Which of the following is the correct question to ask to determine what kind of change the molecules experienced?A. How has the size of the molecules changed?B. How much has the temperature of the molecules changed?C. What is the position of the molecules relative to each other?D. Is this change in the molecules reversible by placing the mothballs back in their bag?
Answers
Mothballs are made of naphtalene. The chemical structure of naphthalene is formed by two benzene rings, which gives this substance the classification of an aromatic compound.
The active principle of naphthalene is explained by a very interesting physical characteristic: sublimation, which is defined as the direct transition from a solid to a gaseous state. Once sublimated, naphthalene appears as a toxic vapor for undesirable microorganisms.
So, when a bag of mothballs is opened, they will sublime. So the molecules will not be able to come back to the bag, because they're in the gaseous state, which is too difficult for us to "pick up" the molecules of mothballs again and place them in their bag again.
It is like picking up water vapor, it is impossible.
Answer: Alternative "D"
Which characteristic of a substance is considered a chemical property?
its boiling point
its reactivity
its density
its conductivity
Answers
Answer:
Reactivity
Explanation:
a chemical reacting to another chemical is considered a Chemical property because chemicals react with other chemicals differently. Pls PLs give me brainliest
Answer:
reactivity
Explanation:
the act or process of changing from a gas or vapor to a liquid.
Answers
Condensation is the process through which a gas changes into a liquid. They come together to form water droplets.
What is Condensation?
Condensation is the process through which matter transitions from its initial gaseous state into its final liquid state. For instance, condensation happens when water vapour in the air, which is in its gaseous form, comes into touch with a cooler surface and turns into liquid water. The water in the air condenses into water droplets when it comes into touch with a cold surface. Evaporation reaction is the opposite of condensation. When water transitions from a gaseous state to a liquid or crystal state, condensation takes place. Any gas can condense at high pressure and low temperature.
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a silver-colored metal is placed in a blue solution. after a few minutes, a red coating forms on the metal and the solution turns clear. which best describes the products of this reaction?
a.Two single elements b.Two compounds c.One compound d.A single element and a compound
Answers
A single element and a compound will be best describes the products of this reaction. Option D is correct.
In this reaction, the silver-colored metal reacts with a component in the blue solution to form a compound. The formation of a red coating on the metal indicates the formation of a compound of silver. At the same time, the solution turns clear, suggesting that the other component in the solution has been consumed or transformed.
Therefore, the products of this reaction are a single element (silver) in the form of the metal and a compound (the red coating) that resulted from the reaction between the metal and the solution.
Hence, D. is the correct option.
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1Propanol is combusted to provide heat The reaction and the enthalpy for the reaction are shown below Below is a list of sentences that describe a chemical reacsion Choose all of the sentences that apply to the above reaction Check all that apply. sharing gs ols View Available Hintls) This chemical reaction transfers heat tomte surroundings to the system This process is endothermic The enthalpy for 2GHrOA(1) + 9Oj (g) ? 60,(g) + 8H20(1) is 4 D42 kJ This process is exothermic The enthalpy for 2C4 H OH)+90()+6C02(8)+SH20(1) is 4.042 kJ This chemical reaction tansters heat from the system to the suroundings The enthalpy for 20,H,OH()+90 (s) -+6C02(s)+ 8H 0(1)s 2.021 k The enthalpy for 2C H:OH()+90()+ 6C0,(g)+8H,0(1) is 2.021
Answers
The combustion reaction of propanol, represented as 2C₄H₁₀(1) + 13O₂(g) → 8CO₂(g) + 10H₂O(1), involves the transfer of heat from the surroundings to the system. This exothermic process releases energy, as indicated by the negative enthalpy value of -442 kJ.
The combustion of propanol results in the formation of carbon dioxide (CO₂) and water (H₂O), while consuming oxygen (O₂) in the process.
This reaction is commonly used to provide heat in various applications, such as heating systems and fuel combustion.
By understanding the thermodynamics of this reaction, it becomes evident that it releases a substantial amount of energy in the form of heat, making it a valuable source of warmth and power.
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as the temperature of a gas decreases is volume
Answers
Answer:
it's volume also decrease
A slow jogger runs2.5miles in 18 minutes. Calculate the jogger's speed in in/sec:(1mile=5280 feet)a. 3.2×10 ^4 in/sb. 2.8×10^-6 in/sc. 2.9×10^5 in/sd. 150 in/s
Answers
The jogger's speed in in/sec is 146.67 inches/second or approximately d. 150 in/s.
To find the jogger's speed in in/sec, we first need to convert the distance and time to the same units.
We'll convert the distance from miles to inches and the time from minutes to seconds.
1 mile = 5280 feet = 63360 inches
18 minutes = 1080 seconds
Now we can use the formula for speed:
Speed = Distance / Time
Speed = (2.5 miles)(63360 inches/mile) / (1080 seconds)
Speed = 158400 inches / 1080 seconds
Speed = 146.67 inches/second
So, the speed is 146.67 inches/second or approximately d. 150 in/s.
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How many mmol of iron are there in 650 mg of iron? O A. 11.6 mmol Fe B. 363.02 mmol Fe C. 55.85 mmol Fe D. 8.95 mmol Fe
Answers
There are 11.6 mmol of iron in 650 mg of iron.
Given the mass of iron as 650 mg. The molar mass of iron is 55.85 g/mol.
We need to calculate how many millimoles (mmol) are present in the given amount of iron.
We will use the following conversion:
1 g = 1000 mg
1 mol = molar mass in grams
1 mmol = 0.001 mol
Number of moles of iron
= 650 mg ÷ 1000 mg/g
= 0.65 g ÷ 55.85 g/mol
= 0.0116 mol
Number of millimoles of iron
= 0.0116 mol ÷ 0.001 mol/mmolar mass of iron
= 11.6 mmol
Hence, there are 11.6 mmol of iron in 650 mg of iron. Therefore, the correct option is A. 11.6 mmol Fe.
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how much difference does it make in your results if the alue you use for the specific heat of the calorimeter cup is off by as much as
Answers
The difference in your results when the value you use for the specific heat of the calorimeter cup is off can significantly impact the accuracy of your calculated results.
The specific heat of the calorimeter cup is used to determine the heat absorbed or released by the calorimeter during an experiment. If the value you use for the specific heat is incorrect, it will lead to inaccurate calculations for the heat absorbed or released by the substances being tested. This, in turn, can affect the determination of other properties such as enthalpy change, reaction rates, and equilibrium constants.
It is essential to use an accurate value for the specific heat of the calorimeter cup to obtain precise and reliable results in your experiments. If the value is off, it can significantly impact the accuracy of your calculated results, leading to potential errors in your experimental conclusions.
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how does the viscosity of diesel compare to the viscosity of biodiesel?
Answers
Biodiesel is more viscous than diesel fuel, making it more difficult to handle, pump, and store.
The viscosity of diesel fuel compared to that of biodiesel fuel is lower.
Diesel fuel has a higher viscosity than biodiesel fuel, which makes it more resistant to flowing.
Viscosity is a significant factor to consider when selecting fuel because it affects the efficiency of the fuel injection system and the amount of energy consumed.
The viscosity of a liquid or a gas is a measure of its resistance to deformation, which is why it is essential in fuel selection.
Viscosity is defined as the fluid's internal friction or resistance to flow when a force is applied.
It is a measure of the thickness of the fluid, and it is expressed in centipoise units (cP).
The viscosity of diesel fuel is usually between 2.0 and 6.0 cP, whereas that of biodiesel fuel is between 1.9 and 6.0 cP. Both fuels' viscosity is affected by temperature, with viscosity decreasing as temperature rises.
However, biodiesel is less viscous than diesel, which is a significant advantage.
When compared to fossil diesel, biodiesel has a lower viscosity at low temperatures, making it more suitable for cold weather operation.
Diesel and biodiesel fuels have different physical properties that may have an impact on their combustion efficiency. The viscosity of diesel fuel is generally higher than that of biodiesel fuel, which means that diesel fuel is more viscous or sticky than biodiesel fuel.
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If 10 milliliters of liquid has a mass of 70 grams, what is its density?
O 7 g/mL
70 g/mL
0.7 g/mL
700 g/mL
Answers
Answer:
The answer is 7 g/mLExplanation:
The density of a substance can be found by using the formula
\(density = \frac{mass}{volume} \\\)
From the question
mass = 70 g
volume = 10 mL
We have
\(density = \frac{70}{10} \\ \)
We have the final answer as
7 g/mLHope this helps you
The air in the balloon i heated up by leaving it in a warm place. Give two effect that thi ha on the air particle
Answers
If the balloon is closed, then yes, both volume and pressure will increase when the gas inside is heated.
What is pressure?
Pressure is the force applied perpendicular to the surface of an object per unit area over which that force is distributed.
Various units are used to express pressure. Some of these are units of force divided by units of area. For example, the SI unit of pressure, Pascal (Pa), is 1 Newton per square meter (N/m2). Similarly, pounds force per square inch (psi, symbol lbf/in2) is the traditional unit of pressure in imperial and US systems. Pressure can also be expressed as standard atmospheric pressure. Atmospheric pressure (atm) is equal to this pressure and torr is defined as 1/760 of this. Manometric units such as centimeters of water, millimeters of mercury, and inches of mercury are used to express pressure as the height of a particular liquid column within a manometer.
If the balloon is closed, then yes, both volume and pressure will increase when the gas inside is heated.
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On which sides of the Earth do high tides occur?
Answers
Tides move around Earth as bulges in the ocean. As the ocean bulges toward the moon, a high tide is created. The high tide on the side of Earth facing the moon is called the high high tide. The high tide caused by the bulge on the opposite side of Earth is called the low high tide.
in a ________ reaction, two or more elements or compounds form one product.
Answers
To solve such this we must know the concept of double displacement reaction. Therefore, the blank should be filled with word chemical.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved.
There are so many types of chemical reaction reaction like combination reaction, double displacement reaction. In a chemical reaction, two or more elements or compounds form one product.
Therefore, the blank should be filled with word chemical.
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on a hot summer day, you make a glass of refreshing sweet iced tea by combining boiling water, tea, sugar, and ice. what type of change occurs and how do you know?
Answers
A physical change will occur when boiling water, tea, sugar, and ice are combined to form sweet iced tea.
What is a physical change?A physical change is a change affecting the form of a chemical substance, but not its chemical composition.
The characteristics of some physical changes are as follows:
textureshapetemperaturechange in the state of matterAccording to this question, one makes a glass of refreshing sweet iced tea by combining boiling water, tea, sugar, and ice on a hot summer day. The resulting solution is an example of a mixture, which contains constituents that retain their individual identity.
This suggests that the change is a physical change because there is no formation of a new substance.
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here’s another question for you: at room temperature, liquid water has a density of about 1 g/cm3, while that of liquid mercury is about 13.6 g/cm3. check all of the ways that the molecular model could account for the difference.
Answers
Mercury's molecules have more mass, Mercury's molecules are spaced closer together
We can argue that density is directly related to mass since density is defined as the ratio of an object's mass to its volume, i.e., the higher an object's mass, the higher its density. Mercury's density will be higher than that of liquid water since it has a higher mass than that of water. Since the molecules of mercury are more tightly spaced from one another than those of a liquid, the latter's molecules exhibit lower forces of attraction. Because an object's force of attraction is directly inversely proportional to its mass, the stronger the force of attraction, the larger the mass, which results in a high density.
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2 C2F4 → C4F8 is 0.0410 M−1 s −1 . We start with 0.105 mol C2F4 in a 4.00-liter container, with no C4F8 initially present. What will be the concentration of C2F4 after 3.00 hours ? Answer in units of M.
Answers
Answer:
After three hours, concentration of C₂F₄ is 0.00208M
Explanation:
As the units of the rate constant of the reaction are M⁻¹s⁻¹ we can know this reaction is of second order. Its integrated law is:
\(\frac{1}{[A]} =\frac{1}{[A]_0} +Kt\)
Where [A] and [A]₀ represents initial and final concentrations of the reactant (C₂F₄), K is rate constant (0.0410M⁻¹s⁻¹) and t is time.
3.00 hours are in seconds:
3 hours ₓ (3600 seconds / 1 hour) = 10800 seconds
Computing in the equation:
\(\frac{1}{[A]} =\frac{1}{[0.105mol / 4L]} +0.0410M^{-1}s^{-1}*10800s\\\frac{1}{[A]} = 480.9M^{-1}\\\\)
[A] = 0.00208M
After three hours, concentration of C₂F₄ is 0.00208Min science, what is occurring when two atoms slam together to form a heavier atom?
Answers
Fusion is the term used in science to describe the process wherein two lighter atoms collide to generate a heavier atom.
Nuclear fusion is the scientific name for what happens when two atoms collide to create a heavier atom.
When two unstable atoms are too close together, they combine to create a much heavier, more stable atom.
Energy is released during the recombination process by the substances that can be provided by the mass energy equivalence,
E = Δmc².
Where c is the speed of light and m is the change in mass caused by the recombination
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2. How many moles are in 6.55 x 108 grams of H2O?
3.63x10^7 moles
Answers
Answer:
Who helped Hernán Cortés and his soldiers defeat the Aztec?
consider the equilibrium of each of the carbonyl compounds with hcn to produce cyanohydrins. which is the correct ranking of compounds in order of increasing keq for this equilibrium
Answers
The correct ranking of compounds in order of increasing keq for this equilibrium is Acetone < Propanone < Benzaldehyde.
The correct ranking of compounds in order of increasing keq for the equilibrium of each of the carbonyl compounds with HCN to produce cyanohydrins is
Acetone < Propanone < Benzaldehyde.
In the above reaction, the cyanide ion acts as a nucleophile and attacks the carbonyl carbon atom in the carbonyl compound to form an intermediate compound. Then the intermediate compound formed by the reaction between HCN and the carbonyl compound undergoes an intramolecular rearrangement to form cyanohydrin.Based on the stability of intermediate compound formed, the order of increasing stability is as follows:
Acetone < Propanone < Benzaldehyde.
Since the keq is directly proportional to the stability of the intermediate, the order of increasing keq for the equilibrium of each of the carbonyl compounds with HCN to produce cyanohydrins is
Acetone < Propanone < Benzaldehyde.
The correct ranking of compounds in order of increasing keq for this equilibrium is
Acetone < Propanone < Benzaldehyde.
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How many moles are in a sample of 32.6732 g of lead ?
Answers
Answer:
0.157689 moles
Explanation:
(Pleaseeee help me) List 3 things you should talk about in a good conclusion?
Answers
Throughout your essay, you’ve shared experiences, skills and knowledge that have driven you toward who you are today. In your conclusion, remind the admissions team about how all those different elements work in combination to make you a unique candidate for their program.
2) It recaps where you are.
This is an aspect applicants often forget to include. You are at a crucial junction between the past and the future, and this program you’re applying to is the bridge. Recap why this program is an important stepping stone in your career path and how it’s a good fit for you personally.
3) It recaps where you are going.
Most importantly, you must tell the admissions team what your long-term career goal is. The more specific you can be, the better (even if you aren’t 100% sure, it’s best to come off as confident that you know what you want!). For example, rather than just recapping that you want to become a doctor, you can share additional sub-goals, such as wanting to be a doctor who works in low-income, inner city hospitals since you volunteered at those types of facilities before. Or perhaps you plan to go back to the country where you grew up and work as a surgeon there since they are in such short supply.
Bring It Together
Once we bring all three of those elements together, you can see how they link together to form one, solid conclusion. Ideally, your conclusion should be about 4-6 sentences long — not too short but not a long ramble. Below is an example showing how fusing the past (1), present (2) and future (3) together can end your essay on a strong note.
Answer:
easy, beging sentenice(dont judge spelling), refer to quotes, final thoughts
Explanation:
sodium is a mineral element and is one of the principle positive ions. T/F?
Answers
True. Sodium is indeed a mineral element that is one of the principle positive ions, also known as cations, in the human body. It plays a crucial role in various bodily functions such as maintaining proper fluid balance, transmitting nerve impulses, and supporting muscle function.
Sodium can be found in a variety of foods, particularly in salt (sodium chloride), processed foods, and certain types of dairy products. However, it's important to consume sodium in moderation as excessive intake can lead to negative health effects such as high blood pressure and increased risk of cardiovascular disease. True, sodium is a mineral element and is one of the principle positive ions.
Sodium is indeed a mineral element and is one of the principle positive ions, or cations, in our body. It plays a crucial role in maintaining proper fluid balance, nerve function, and muscle function. Sodium is an essential element that our body needs for various physiological processes. As a positive ion, it helps in maintaining the balance of fluids inside and outside our cells. Sodium also plays a critical role in transmitting nerve impulses and aiding muscle contractions.
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A 10.0-liter flask contains 1.013 grams of oxygen and .572 grams of carbon dioxide at 180C. What are the partial pressures of oxygen and carbon dioxide? What is the total pressure? What is the mole fraction of oxygen in the mixture?
Answers
P tot = 0.1065 atm
The mole fraction of oxygen in the mixture : 0.709
Further explanationGiven
10 L flask
1.013 g O₂
572 g CO₂
T = 18 °C = 291 K
Required
P O₂ and P CO₂
Solution
Dalton Law's of partila pressure
P tot = P₁ + P₂ + ..Pₙ
From ideal gas Law :
\(\tt P_{O_2}=\dfrac{\dfrac{1.013}{32}\times 0.082\times 291 }{10}\\\\P_{O_2}=0.0755~atm\)
\(\tt P_{CO_2}=\dfrac{\dfrac{0.572}{44}\times 0.082\times 291}{10}\\\\P_{CO_2}=0.031~atm\)
P tot = P O₂ + P CO₂
P tot = 0.0755 + 0.031
P tot = 0.1065 atm
The mole fraction of O₂ :
\(\tt P_{O_2}=X_{O_2}\times P_{tot}\\\\X_{O_2}=\dfrac{P_{O_2}}{P_{tot}}\\\\X_{O_2}=\dfrac{0.0755~atm}{0.1065~atm}\\\\X_{O_2}=0.709\)
A 25 g sample of compound Delta is mixed with a 25 g sample of compound Omicron. A reaction occurs in which a gas is produced. Once the reaction is complete, the final mixture has a mass of 35 g. (a) What is the mass of the gas? (b) What happened to the gas? (c) Does this violate the law of conservation of mass? Why or why not?
Answers
A 25 g sample of compound Delta is mixed with a 25 g sample of compound Omicron. A reaction occurs in which a gas is produced. Once the reaction is complete, the final mixture has a mass of 35 g.
(a) The mass of the gas can be calculated by finding the difference in mass before and after the reaction.
Initial total mass = Mass of compound Delta + Mass of compound Omicron = 25 g + 25 g = 50 g
Final total mass = Mass of the final mixture = 35 g
Mass of the gas produced = Final total mass - Initial total mass = 35 g - 50 g = -15 g
The mass of the gas is -15 g.
(b) The negative mass value indicates an inconsistency or error in the given information. In a chemical reaction, the mass cannot be negative. It is possible that there was a mistake in the measurements or calculations.
(c) Yes, this situation violates the law of conservation of mass. The law of conservation of mass states that the mass of the reactants should be equal to the mass of the products in a chemical reaction. In this case, the total mass after the reaction (35 g) is less than the total mass before the reaction (50 g). This violates the principle of mass conservation, suggesting that there may have been an error in the measurements or a loss of mass during the reaction that was not accounted for.
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4. Lithium + tin(IV) sulfite ® lithium sulfite + tin-
Answers
2Li2S + Sn(SO4)2 → 2Li2(SO4) + SnS2 is Balanced chemical equation.
What is Balanced chemical equation?
A balanced chemical equation is a chemical reaction that has equal numbers of moles of chemical substances both in the reactant and the product side.
A chemical equation is said to be balanced if the quantity of each type of atom in the reaction is the same on both the reactant and product sides.
In a balanced chemical equation, the mass and the change are both equal.
From the missing image that is attached below, we can see that the picture depicts that we have:
The reactant side:
3 molecules of CH₄ and 3 molecules of N₂Cl₄
The product side:
3 molecules of CCl₄, 3 molecules of N₂ and 6 molecules of H₂
Therefore, the balanced chemical equation for the reaction is:
3CH₄ + 3 N₂Cl₄ → 3 CCl₄ + 3N₂ + 6H₂
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Are the number of neutrons equal to the atomic number?
Answers
The number of neutrons is equal to the difference between the mass number of the atom (M) and the atomic number (Z).
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Which statement is not
true?
A. The troposphere is responsible for nearly
all of Earth’s weather.
B. The exosphere reaches deep into space
and is the least dense layer.
C. The thermosphere typically breaks up
meteors before they hit Earth.
D. The stratosphere allows commercial
airlines to fly with less turbulence because
of fewer convection currents.
Answers
explanation: to make C correct, the sphere that breaks up meteors is the mesosphere.
The atmosphere of the earth is layered and each layer of the atmosphere has its own properties. The atmosphere of the earth is divided into four layers. The thermosphere typically breaks up meteors before they hit Earth is not correct. The correct option is C.
What is mesosphere?The four important layers of atmosphere are troposphere, stratosphere, thermosphere and mesosphere. The layer of the atmosphere which is found above the stratosphere is defined as the mesosphere. It is the coldest layer of the atmosphere.
A meteor is known as a celestial object which is made up of rocks and minerals which enters the atmosphere of the earth and burns out completely before reaching the surface of the earth. It is known as the shooting star or falling star.
The temperature of mesosphere drops with altitude. By 80 km it reaches 100 degree celsius. The meteors burn up in this layer not in thermosphere.
Thus the correct option is C.
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What is a base?
A. A substance that increases the concentration of oxygen in
solution
B. A substance that increases the concentration of OH ions in
solution
C. A substance that increases the concentration of H+ ions when dissolved
D. A substance that contributes chloride ions to the solution
Answers
Answer:
A base releases OH~ in a solution, so the answer is B
- Lead acid batteries used in cars contain a concentrated
solution of sulfuric acid. When these batteries are
recycled, their sulfuric acid is drained and neutralized to
produce water and sodium sulfate. Suggest a compound
that could be used to neutralize sulfuric acid and produce
sodium sulfate. Justify your choice by writing the chemical
equation for the reaction.
Answers
As per the chemical reaction ,sodium hydroxide can be used for neutralization of sulfuric acid as,2 NaOH+H₂SO₄\(\rightarrow\)Na₂SO₄ +2 H₂O.
What are chemical reactions?Chemical reactions are defined as reactions which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.
There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are three types of chemical reactions:
1) inorganic reactions
2)organic reactions
3) biochemical reactions
During chemical reactions atoms are rearranged and changes are accompanied by an energy change as new substances are formed.
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