In an electric power plant, personnel monitor the O2 content of boiler feed water to prevent corrosion of the boiler tubes. Why does Fe corrode faster in steam and hot water than in cold water?
Answers
In an electric power plant ,personnel monitor the O2 content of the boiler feed water to prevent corrosion of the boiler tubes . in boiler tubes there is iron metal exposed to water and gases ,increasing chances of corrosion .
Fe metal particularly faster to corrodes when there is supply of oxygen available .as the steam is a gaseous material containing water molecules , so there is a high chances of availability of oxygen than in hot and cold water . because the water even if it is hot and cold it does not have sufficient amount of oxygen than the outer environment where steam is present .
Hence , Fe corrodes faster in steam than in hot water than in cold water .
What is corrosion ?Corrosion is a process in which there is transformation of pure metal into damaged metal due to the expose to the outer environment and in contact with water and oxygen .
it is a natural phenomena which have negative impact on the metal body.
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Related Questions
I need help in practice 31 trying to find out the name of the hydrocarbon compound
Answers
The hydrocarbon compound with the formula CH₃ C(CH₃)₂ CH(CH₃) CH₂ CH₂ CH₃ is 2,2-dimethylpentane.
How to name hydrocarbons?To name a hydrocarbon, identify the longest continuous chain of carbon atoms. In this case, the longest chain has 5 carbon atoms. This tells you that the compound is a pentane.
Next, identify any branches off of the main chain. In this case, there are two branches, each of which has 2 carbon atoms. These are called methyl groups.
Finally, number the carbon atoms in the main chain so that the branches are attached to the lowest possible number. In this case, the carbon atoms are numbered 1, 2, 3, 4, 5, and 6. The branches are attached to carbon atoms 2 and 4.
The name of the compound is then 2,2-dimethylpentane. The "2,2" tells you that the methyl groups are attached to carbon atoms 2 and 2. The "dimethyl" tells you that there are two methyl groups. The "pentane" tells you that there are 5 carbon atoms in the main chain.
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WILL GIVE BRAINLEST!!
Question 5
Coastal flooding occurs when_
A. Rocks or debris block rivers causing them to overflow
B. Severe weather occurs causing large waves to hit the coast
C. Huge amounts of snow and ice melt due to sudden temperature variations
D. Colossal amounts of rain fall in a short period of time
Answers
Is it coating iron pipe with Zinc or connecting a zinc rod to a
iron pipe, which is advantageous to protect the Fe surface from
undergoing corrosion? Justify the answer
Answers
Connecting a zinc rod to an iron pipe offers advantages in protecting the iron surface from corrosion. The zinc acts as a sacrificial anode, corroding in place of the iron and providing uniform and extended protection to the entire iron pipe.
Connecting a zinc rod to an iron pipe is advantageous to protect the iron (Fe) surface from undergoing corrosion. This process is known as cathodic protection, where the zinc acts as a sacrificial anode. Here's the justification for this answer:
Galvanic Protection: When a zinc rod is connected to an iron pipe, it creates a galvanic cell. Zinc is more reactive than iron, so it acts as the anode, sacrificing itself to protect the iron pipe (cathode). The zinc corrodes instead of the iron, thereby providing protection to the iron surface.Sacrificial Anode: Zinc has a higher electrochemical potential than iron, making it more susceptible to corrosion. This means that zinc will preferentially corrode instead of the iron pipe. By connecting a zinc rod, the zinc sacrificially corrodes, protecting the iron from corrosion. Uniform Protection: Connecting a zinc rod provides uniform protection to the entire iron pipe surface. As long as the zinc rod is in contact with the iron pipe, it will continuously provide cathodic protection along the entire length of the pipe. Extended Protection: The sacrificial zinc anode can provide protection for an extended period before it gets fully consumed. Once the zinc is depleted, it can be replaced with a new zinc rod to continue the protection.Read more on corrosion here: https://brainly.com/question/489228
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this imagine shows the continents breaking apart what do scientist think causes the continents to move?
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The movement of the continental plates is due to convection currents located at the Earth's mantle below the crust.
A tectonic plate is a slab of solid rock consisting of continental and oceanic lithosphere. The continental and oceanic plates include, among others, the Pacific plate, Nazca plate, the Eurasian plate, the Australian-Indian plate, the North American plate, the South American plate, the African plate, the Antarctic plate, etc.The convection currents control the movement of the continental and oceanic plates on the Earth's molten mantle.In conclusion, the movement of the continental plates is due to convection currents located at the Earth's mantle below the crust.
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Which of the following represents alpha decay?
Answers
Answer: b
Explanation: alpha decay or particle consist of two protons and two neutrons hence it is a helium nucleus.
An alpha particle \(\binom {4} {2}\)He is produced in alpha decay reactions, while the parent nucleus' atomic number and mass number drop by 2 and 4 correspondingly.
Alpha decay:Alpha decay is a nuclear process whereby an unstable nuclear transforms into a different element by ejecting particles composed of two protons and two neutrons. The alpha particle also referred to as a helium nucleus, is the expelled unit of matter. Alpha particles have large masses and electrostatic attraction.An atomic number decreases by 2 and the atomic weight drops by 4 when a radioactive nucleus disintegrates by emitting \(\bold{\alpha}\) particle.Therefore, the final answer is "Option B".
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An old refrigerator is rated at 500 W how many kilowatt hours of electric energy what does refrigerator use in 30 days assume the refrigerator is running 12 hours per day
Answers
The refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.
To calculate the kilowatt-hours (kWh) of electric energy used by the refrigerator in 30 days, we need to multiply the power rating by the total running time.
Given:
Power rating of the refrigerator = 500 W
Running time per day = 12 hours
Number of days = 30
First, we need to convert the power rating from watts to kilowatts:
Power rating = 500 W / 1000 = 0.5 kW
Next, we calculate the total energy used in kilowatt-hours (kWh) over the 30-day period:
Energy used = Power rating × Running time × Number of days
Energy used = 0.5 kW × 12 hours/day × 30 days
Energy used = 180 kWh
Therefore, the refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.
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which of the following properties of water are physical properties? select all that apply. multiple select question. electrolysis of water produces both hydrogen gas and oxygen gas. water exists as a liquid at 25oc. the boiling point of water is 373.15 k. water combines with carbon dioxide to make carbonic acid. water has a density of 1.00 g/ml.
Answers
The ones that are physical properties of water are:
Water exists as a liquid at 25°C.The boiling point of water is 373.15 K.Water has a density of 1.00 g/ml.All substances that exist in the universe have chemical properties and physical properties. Chemical properties are the properties that are able to be observed or measured only when the substance is undergoing a chemical change or chemical reaction. These properties are connected to the chemical bonds that a substance has. Some examples of chemical properties are flammability, toxicity, and radioactivity.
Physical properties are properties that are able to be observed without changing the identity or chemical composition of the substance. In another way, these properties can be observed without testing the substance under chemical change. Some examples of physical properties are boiling point, shape, color, odor, and texture.
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The heater used in a 4. 31 m×3. 42 m×2. 98 m dorm room uses the combustion of natural gas (primarily methane gas) to produce the heat required to increase the temperature of the air in the dorm room. Assuming that all of the energy produced in the reaction goes towards heating only the air in the dorm room, calculate the mass of methane required to increase the temperature of the air by 7. 04 °C. Assume that the specific heat of air is 30. 0 J/K·mol and that 1. 00 mol of air occupies 22. 4 L at all temperatures. Enthalpy of formation values can be found in this table. Assume gaseous water is produced in the combustion of methane
Answers
Approximately 2.57 g of methane is required to increase the temperature of the air in the dorm room by 7.04 °C,
\(CH_4\)(g) + 2\(O_2\)(g) → \(CO_2\)(g) + 2\(H_2O\)(g)
ΔH = ΣnΔHf(products) - ΣnΔHf(reactants)
ΔH = [ΔHf(\(CO_2\)) + 2ΔHf(\(H_2O\))] - [ΔHf(\(CH_4\)) + 2ΔHf(\(O_2\))]
ΔH = [(-393.5 kJ/mol) + 2(-241.8 kJ/mol)] - [(-74.8 kJ/mol) + 2(0 kJ/mol)]
ΔH = -802.3 kJ/mol
Energy produced by burning methane = (-802.3 kJ/mol) × (mass of methane in moles)
Mass of methane required = (3,289,808 J) / [(-802.3 kJ/mol) × (16.04 g/mol)] = 2.57 g
Methane is a chemical compound with the molecular formula CH4. It is a colorless, odorless gas that is the primary component of natural gas. Methane is composed of one carbon atom bonded to four hydrogen atoms. It is highly flammable and can be found in various sources, including fossil fuels, wetlands, livestock, and landfills.
Methane is a potent greenhouse gas, meaning it has a significant impact on climate change. It has about 25 times the warming potential of carbon dioxide over a 100-year period. The release of methane into the atmosphere occurs through natural processes as well as human activities, such as the production and transport of coal, oil, and natural gas.
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state the process by which the harmful substances in cigarettes can reach the lungs of an involuntary smoker. who inhales the cigarette smoke from the air.
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When you are close to tobacco smoke sources, you may unintentionally breathe in secondhand smoke, often known as passive smoking.
For instance, you might interact with smokers at events or gatherings where smoking is permitted. Even though you might not notice any changes, secondhand smoke exposure can be harmful to your health.
It's not simply uncomfortable for your friends and family when they inhale your secondhand smoke; this is what we refer to as passive smoking. It can also be harmful to their health.
Regular secondhand smoke exposure increases the risk of developing heart disease and lung cancer, two diseases that smokers are more prone to develop.
Smoking tobacco products both actively and passively as well as exposure to some hazardous chemicals are the two main causes of lung cancer. Smoking tobacco most certainly causes respiratory issues, mouth and lung cancer, and both.
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If a yellow paint is to have 0.511% pbcro4 by mass, how many grams of chromite are needed per kilogram of paint?
Answers
Yellow paint has 0.511 % PbCrO4 by mass
Mass of PbCrO4 in 1 kg of paint = (0.511 / 100) * 1 kg = 0.00511 kg = 5.11 g
Moles of PbCrO4 = 5.11 g/ 323.19 g/mol
= 0.0158 moles
Moles of K2CrO4 also = 0.0158 moles
Moles of FeCr2O4 = 0.0158 moles K2CrO4 * (4 mole FeCr2O4 / 8 moles K2CrO4)
= 0.0079 moles
Mass of FeCr2O4 (chromite) = 0.0079 moles * 223.83 g/mol
= 1.77 g
Paints are divided into two types: oil-based paints and water-based paints. Oil paints are usually used as a primer, undercoat, and topcoat. In the past, we relied heavily on oil-based paints for surface durability and longevity, but today water-based paints are on par. It is used for prolongation and acts as a barrier against environmental influences. Paint consists of pigments, solvents, resins, and various additives. Pigments give the paint its color. Solvents make application easier. The resin helps dry. Additives range from fillers to antifungals. There are hundreds of different natural and synthetic pigments.
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when solid sodium hydroxide dissolves in water, the δh for the solution process is −44.4 kj/mol. if a 13.9 g sample of naoh dissolves in 250.0 g of water in a coffee-cup calorimeter initially at 23.0 °c. what is the final temperature of the solution? assume that the solution has the same specific heat as liquid water, i.e., 4.18 j/g·k.
Answers
The final temperature of solid sodium hydroxide dissolves in water is 355.88 kelvin.
A given amount of matter's heat capacity is the amount of energy needed to raise its temperature by one degree Celsius. While the heat capacity of 1 mole of a substance is known as its molar heat capacity, the heat capacity of 1 gram of a substance is referred to as its specific heat capacity (or specific heat). The equation q = mcT, where m is the mass of the sample, c is the specific heat, and T is the temperature change, can be used to determine how much heat is gained or lost by a sample (q).
Given
Mass of NaOH = 13.9 g
Mass of water = 250 gram
Specific heat of the solution = 4.18 j/g·k
Initial temperature = 23.0 °c or 296 kelvin
Heat evolved in process = −44.4 kj/mol
Q = mc (T₂ - T₁)
−44400 j/mol = 263.9 x 4.18 j/g·k x (T₂ - 296k)
T₂ = 355.88 k
Hence, final temperature of NaOH solution is 355.88 kelvin.
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Is this a redox reaction? give evidence (many points plz answer)
2Mg + CO2 → 2MgO + C
Answers
Answer:
\( \boxed{yeah}\)
Explanation:
\(CO_2 \: is \: reduced \: to→C \: by \: 2M_g \: (the \: reducing \: agent): while \\ 2M_g \: is \: oxydized \: to→2M_gO \: by \: CO_2 \: (the \: oxydizing \: agent)\)
define the acid rain for class 10 .???
Answers
Answer: Acid rain is caused by a chemical reaction that begins when compounds such as sulphur dioxide and oxides of nitrogen are released into the air. These substances can rise very high up into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants called acid rain.
Explanation:
Describe the properties of alkali metals. based on their electronic arrangement, explain whether they exist alone in nature.
Answers
The alkali metals can't exist alone in nature because of incomplete outermost shell of alkali metals.
What are the properties of alkali metals?The alkali metals have the high thermal and electrical conductivity. It has high lustre, ductility, and malleability as compared to other materials. Each alkali metal atom has one electron in its outermost shell which make more reactive.
So we can conclude that the alkali metals can't exist alone in nature because of incomplete outermost shell of alkali metals.
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what is the heat, q , in joules transferred by a chemical reaction to the reservoir of a calorimeter containing 95.0 g of dilute aqueous solution ( c
Answers
Heat is the result of the movement of kinetic energy within a material or an item, or by a source of energy to a material or an object.
What in chemistry is a heat?Energy that is transported from a region of greater temperature to one of lower temperature is known as heat.Joule is the SI unit (J).Heat is another factor that causes the phase transition.
What does fundamental science mean by heat?heat is the energy that moves through one body to the other when temperatures are different.Heat passes from the hotter to the colder body when two bodies with differing temperatures are brought together.
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a. Law of conservation of matter
i. What does the law say about matter?
Answers
how many moles of nacl are in 276.50 ml of 1.55 m nacl solution?question 2 options:4291785.610.4290.178
Answers
The number of moles of NaCl present in 276.50 mL of 1.55 M NaCl solution is 0.429 mol.
To find the number of moles of NaCl in a given solution, we can use the formula: moles of solute = concentration of solution x volume of solution We are given the following information:Concentration of solution = 1.55 MVolume of solution = 276.50 mL
To use this formula, we need to convert the volume of the solution from milliliters (mL) to liters (L).1 L = 1000 mLTherefore, 276.50 mL = 0.27650 LNow, we can substitute the given values in the formula and calculate the number of moles of NaCl present in the solution:moles of solute = concentration of solution x volume of solution= 1.55 M x 0.27650 L= 0.429 molTherefore, there are 0.429 moles of NaCl in 276.50 mL of 1.55 M NaCl solution. Hence, the correct option is 0.429.
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7. A dog sled is pulled by 8 dogs and accelerates at 1.2 m/s². If each dog pulls with a force of 30 N, what
is the combined mass of the sled and rider?
Answers
The combine mass of the sled and the rider, given that each dog pulled with a force of 30 N is 200 Kg
How to determine the combine massWe know that force is related to mass and acceleration according to the following formula:
Force (F) = mass (m) × acceleration (a)
F = ma
With the above formula, we can determine the combined mass of the sled and rider. Details below.
From the question given above, the following data were obtained:
Acceleration (a) = 1.2 m/s²Force of each dog = 30 NForce of 8 dogs = 8 × 30 = 240 NCombined mass (m) =?The combined mass can be obtained as follow:
Force = mass × acceleration
240 = mass × 1.2
Divide both sides by 1.2
Mass = 240 / 1.2
Mass = 200 Kg
Thus, the combine mass is 200 Kg
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Select all the correct answers.
What do scientists use to communicate extremely small measurements?
scientific notation
unit prefixes
graduated cylinders
physical models
base units
Answers
Scientists use scientific notation to communicate extremely small measurements. Hence, option A is correct.
What scientific notation?Scientific notation is a way of writing very large or very small numbers.
Scientists use scientific notation to represent very small or very large numbers because this notation increases the
accuracy of measured quantities.convenience in using the numbers.the number of significant figures.precision of measurements.Hence, option A is correct.
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what is the molarity of a solution that was prepared by dissolving 82.0 g of CaCl2 in enough water to make 812 mL of solution
Answers
The molarity of a solution that was prepared by dissolving 82.0 g of calcium chloride in enough water to make 812 mL of solution is 0.91M.
How to calculate molarity?Molarity is the concentration of a substance in solution, expressed as the number moles of solute per litre of solution
The Molarity of a solution can be calculated using the following formula:
Molarity = no of moles ÷ volume
According to this question, a solution was prepared by dissolving 82.0 g of calcium chloride in enough water to make 812 mL of solution. The molarity can be calculated as follows:
no of moles of Calcium chloride = 82.0g ÷ 110.98 g/mol = 0.74 mol
Molarity = 0.74 ÷ 0.812 = 0.91M
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Why does potassium have a higher second ionization energy than calcium?
Answers
Answer:
The first ionization energy for K is less than Ca because Ca has a larger effective nuclear charge. There is a large increase in the second ionization energy for K compared to Ca because removal of the second electron from K is a core electron that is in a quantum shell closer to the nucleus.
Explanation:
7. The percent by mass of chlorine in C2H5Cl is A) 51.94% B) 53.94% C) 64.94% D) 54.94%
Answers
The percent by mass of chlorine in C2H5Cl is D) 54.94%.
In C2H5Cl, The molecular weight of C2H5Cl is (12.01 + (2*1.01) + 35.45) = 64.47 g/mol
The weight of chlorine in the compound is 35.45 g/mol.
The mass percent of chlorine in the compound can be calculated by (mass of chlorine/total mass) x 100%.
Therefore, (35.45/64.47) x 100% = 54.94%
So, The percent by mass of chlorine in C2H5Cl is 54.94%.
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which layer of the earth has the lowest density
Answers
Answer:
lithosphere
Explanation:
Earth's interior layers are ordered by density. The densest layer is the solid metal inner core, the mantle is of intermediate density, and the least dense layer is the lithosphere, particularly the continental lithosphere.
The crust is the layer of the earth with the lowest density.
The crust is the rock layer that is the lightest and most buoyant on Earth. 41% of the Earth's surface is covered by continental crust, with a quarter of that covered by ocean floor. The thickness of the continental crust is 20 to 80 kilometers. Four billion years of Earth's history are stored in its rocks.
The crust is the outermost layer of the Earth, and it is only about 5-70 km deep. The mantle is the layer beneath the crust, which is about 2,900 km thick and has a thickness that varies. The core is divided into two sections: the inner core, which is solid, and the outer core, which is liquid. The Earth's surface is made up of several plates, which are continuously changing due to forces within the Earth.
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david's father has three sons, snap, crackle, and _?
Answers
Answer:
david
Explanation:
ty for the points!!!!!!!!
Answer:
David
Explanation:
I need help with this question!!
Answers
Answer:
A. 15
Explanation:
From the equation we see that 6 water particles are used to make 1 particle of the hexose.
That means, that to make 1 mole of the hexose, we need 6 moles of water (as a mole is an unit of count of particles).
To make 2.5moles of the hexose, we need 2.5*6 moles of water, so 15 moles of water.
which nonrenewable resource cannot be recycled? responses copper copper aluminum aluminum oil oil iron
Answers
Oil is a nonrenewable resource that cannot be recycled.
In the field of physics, oil can be described as a source of energy that comes from fossil fuels. All of the energy resources that come from fossil fuels are non-renewable as they are made from the dead remains of plants and animals that died a long time ago.
Among the options provided above, all are metals except oil. Metals can be recycled by burning them and shaping them into something useful.
However, fossil fuel resources cannot be recycled as the ones used are all consumed and burned up into the atmosphere.
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Mendeleev predicted the existence of certain elements not known at that time and named two of them as eka-aluminium, and eka-silicon.
(a) Name the element which has taken the place of (i) eka-aluminium and (ii) eka-silicon
(b) Mention the period/periods of these elements in the modern periodic table.
(c) Write the group/groups of these elements in the modern periodic table.
(d) Classify these elements as metals, non-metals or metalloids.
(e) How many valence electrons are present in the atoms of each of these elements?
Answers
A) Element name is (i) gallium (ii) germanium
B) 4th period
C) Group = eka - aluminum - 13 and eka - silicon - 14
D) Gallium is metal germanium is metalloid
E) valence electrons = 3, 4
Mendeleev predicted the existence of the certain elements that is not known at that time and named the two of them as eka-aluminum, and eka-silicon.
A) The name of the elements are :
(i) eka - aluminum = gallium
(ii) eka - silicon = germanium
B) The period of these elements in the modern periodic table is both belongs to the 4th period.
C) The groups of these elements in the modern periodic table is gallium belongs t the group 13 and germanium belongs to the group 14.
D) The Gallium is metal germanium is metalloid.
E) Gallium electronic configuration : [Ar] 3d¹⁰ 4s² 4p¹, The valance electron is 3.
The germanium electronic configuration : [Ar] 3d¹⁰ 4s² 4p², the valence electrons is 4.
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What are two factors that can change the rate of a chemical?
Answers
Answer:
the surface area of a solid reactant.
temperature.
presence/absence of a catalyst.
which of the following uses mechanical energy to function?
A. computer
B. battery
C. microwave oven
D. windmill
Answers
proven of oil that can be extracted economically with current technology are a more conservative estimate than total , which are an attempt to quantify total accumulations.
Answers
Proven oil reserves are a more conservative estimate than total reserves.
What is the boiling point of water at a pressure of 1 atm and what factors can affect its value?The statement is true. Proven oil reserves refer to the estimated amount of oil that can be economically extracted with current technology and under current economic conditions. This estimate takes into account factors such as the cost of extraction, market demand, and technology limitations. In contrast, total oil reserves refer to the estimated amount of oil in a given area, regardless of whether it can be extracted economically. Total reserves are often much larger than proven reserves, as they include oil that may be too difficult or expensive to extract with current technology. However, proven reserves are a more conservative estimate of how much oil can be reliably extracted, and are therefore used as a key metric in the oil industry.
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