The total pressure of a gaseous mixture that contains three gases with partial pressures is 972 torr.
When more than one gas is present in a container, each gas exerts pressure, which is known as partial pressure. Its partial pressure refers to the pressure of any gas inside the container.
According to Dalton's Law, also known as the Law of Partial Pressures, the combined pressure of a mixture of gases is equal to the sum of their individual partial pressures.
1 - 0.845 atm - 0.854 atm x 760 Torr/atm = 642 torr
2 - 120 torr
3 - 210 mmHg - 1 mmhg is almost equivalent to 1 torr - therefore its 210 torr
total pressure - 642 + 120 + 210 = 972 torr
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introduction to atoms and isotopes the following activity will help you learn the important structural characteristics of an atom. how do we classify atoms? how does the combination of subatomic particles affect the mass and charge of an atom? what are isotopes
Atoms that have the same number of protons but different quantities of neutrons are called isotopes. Isotopes are several versions of the same element. As an illustration, the carbon isotopes 12 and 14 each have 6 and 8 neutrons, respectively.
What is Isotopes ?Protons, neutrons, and electrons are the three subatomic particles that make up a normal atom (as seen in the helium atom below). There are other particles, such as alpha and beta particles (which are discussed below). The Bohr model presents the three fundamental subatomic particles clearly.
The nucleus, a small, dense region at the center of every atom, which is made up of nucleons, contains the majority of an atom's mass. Protons and neutrons are examples of nucleons. The protons in an atom's nucleus are the source of all of the atom's positive charge. Neutrons have no charge at all.
Isotopes can be created artificially by bombarding a stable nucleus with charged particles using accelerators or neutrons in a nuclear reactor, or they can be created naturally through the radioactive decay of a nucleus (i.e., emission of energy in the form of alpha particles, beta particles, neutrons, and photons).
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water and carbon dioxide react to form carbonic acid which is found in soda. the reaction is represented by the equation above. which subscript needs to be added in the box to make this equation balanced?
Answer:
The subscript that needs to be added to the equation to make it balanced is 2.
Question 4 (1 point)
How many oxygens are present on the reactants side of this equation?
KCIO3 --> KCI + O₂
01
5
3
2
Oxygens are present on the reactants side of this equation is 3
Reactant is a substance that enters into and is altered in the course of a chemical reaction and the substance to the left of the arrow in a chemical equation are called reactant and a reactant is a substances that is present at the start of a chemical reaction and the substances to the right arrow are called product and a product is a substances that is present at end of chemical reaction
Here given reaction is
KCIO₃ → KCI + O₂
Here 3 oxygen atom are seen in the reactant so 3 oxygen atom are in the reactant side in the equation
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What is the enthalpy change (in kJ) of a chemical reaction that raises the temperature of 250.0 mL of solution having a density of 1.25 g/mL by 2.40°C? (The specific heat of the solution is 3.74 J/g ⋅
⋅
K.)
The enthalpy change (in KJ) of the chemical reaction that raises the temperature of the solution by 2.40 °C is 8.976×10⁻³ KJ
How do I determin the enthalpy change?We'll begin by obtainig the mass of the solution. This can be obtained as follow:
Volume of solution = 250.0 mLDensity of solution = 1.25 g/mLMass of solution =?Mass = density × volume
Mass of solution = 1.25 × 250
Mass of solution = 312.5 g
Next, we shall determine the heat energy absorbed by the solution. This can be obataned as follow:
Mass of solution = 312.5 gChange in temperature (ΔT) = 2.40 °CSpecific heat capacity of solution (C) = 3.74 J/gºC Heat absorbed (Q) =?Q = MCΔT
Q = 312.5 × 3.74 × 2.4
Q = 2805 J
Finally, we shall detetrmine the enthalpy change. This can be obtained as follow:
Heat absorbed (Q) = 2805 J = 2805 / 1000 = 2.805 KJMass of solution (m) = 312.5 gEnthalpy change (ΔH) =?Q = m × ΔH
2.805 = 312.5 × ΔH
Divide both sides by 312.5
ΔH = 2.805 / 312.5
ΔH = 8.976×10⁻³ KJ
Thus, the enthalpy change is 8.976×10⁻³ KJ
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Consider the reaction
H2(g) + Cl2(g)2HCl(g)
Using standard thermodynamic data at 298K, calculate the entropy change for the surroundings when 2.41 moles of H2(g) react at standard conditions.
S°surroundings = J/K
The value of Δ[tex]S^{o}[/tex] for the surrounding when 2.41 moles of [tex]H_{2}[/tex] gas react at standard condition is 48.2 J/K.
What is entropy change and how to calculate it for the given equation?Entropy change can be defined as the difference between the entropies of all the reactants and products multiplied by the corresponding number of moles for each.
Δ[tex]S_{rxn}[/tex] = Σ(n × [tex]S_{product}[/tex]) - Σ(n × [tex]S_{reactant}[/tex])
where, n = number of moles
For the given reaction:
[tex]H_{2}[/tex](g) + [tex]Cl_{2}[/tex](g) = [tex]2HCl[/tex](g)
The standard absolute entropies (S) are:
[tex]H_{2}[/tex] = 131 J/K .mole
[tex]Cl_{2}[/tex] = 223 J/K .mole
[tex]HCl[/tex] = 187 J/K .mole
On putting these values in above equation for calculating entropy change:
Δ[tex]S_{rxn}[/tex] = 2 × 187 - (131 + 223)
Δ[tex]S_{rxn}[/tex] = 374−131−223 = 20 J/K .mole
Entropy change of the surroundings when 1 mole of [tex]H_{2}[/tex] reacts = 20 J/K .mole
Now, when 2.41 moles of [tex]H_{2}[/tex] react, the entropy change of surrounding can be calculated as = 20 × 2.41 = 48.2 J/K
Therefore, the value of Δ[tex]S^{o}[/tex] when given moles of [tex]H_{2}[/tex] react is 48.2 J/K.
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solid phosphorus and chlorinegas react to form solid phosphorus pentachloride. suppose you have of and of in a reactor. suppose as much as possible of the reacts. how much will be left? round your answer to the nearest .
Learn mole concept to find the answer.
What is mole?
The mole, denoted by the symbol "mol," is the volume of a system that contains the same number of atoms in 0.012 kilograms of carbon-12 as there are elementary particles.
What is solid phosphorus pentachloride?
A crystalline solid with a pungent smell, phosphorus pentachloride is greenish-yellow in color. Water breaks it down into hydrochloric and phosphoric acid as well as heat. It's possible that this heat will ignite nearby combustible material.
2P(s)+5cl₂(gm)⇒2pcl₅(s)
2 moles of p react with 5 moles of cl₂
9.0 moles p react with moles of cl₂= 5 mol/2mol* 9.0mol
=22.5mol cl₂ (required mol of cl₂)
but we have 2.o mol of cl₂ .
It needs cl₂ is limiting reactant and p is presenting excess
as the reaction proceed according to the amount of limiting reactant
so, 5 mol of cl₂ produce 2 mol of pcl₅
2.0 mol of cl₂ produce mol of pcl₅= 2 mol / 5mol*2.0 mol
=0.8 mol pcl5.
hence largest amount of pcl₅ that would be produced is 0.8
Therefore, 0.8 mol present in the pcl5.
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which element may have more than eight valence electrons around it when present in a covalent compound?
Element may have more than eight valence electrons around it when present in a covalent compound is phosphorous
Valence electron are the electron located at the outermost shell of an atom and an atom like phosphorous or sulfur which has more than an octet is said to have expanded its valence shell and this can only occur when the valence shell has enough orbitals to accommodate the extra electron for example in the case of phosphorous the valence shell has a principle quantum number n = 3 and the maximum number of electron possible in the valence shell of the second row element is eight however the element of third row such as phosphorous and sulfur can form stable system by sharing eight or more electron
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Which option is not a natural resource?
Responses
gold
gold
concrete
concrete
lumber
lumber
oil
The option that is not a natural resource but must be produced artificially is concrete.
What are natural resources?The term natural resources has to do with the resources tat we can be able to exploit from nature. The may be found on the surface as well as in the oceans and in the depth of the ground.
A lot of the natural resources can be processed and made into something that can be used to generate more money. Thus we have procedure like the processing of metals in order to obtain building materials and the processing of wood for timber.
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nitrous oxide was first discovered by a french psychiatrist who was attempting to develop a sedative agent to treat schizophrenic patients. True or False
Nitrous oxide was first discovered by a French psychiatrist who was attempting to develop a sedative agent to treat schizophrenic patients. This statement is false.
What is Nitrous Oxide?
Nitrous oxide is a colorless, odorless chemical compound and non-combustible gas at normal room temperature.
It is generally known as 'laughing gas' and its molecular formula is N2O.
Other characteristics of this gas include sweet, gentle smell and and slight sweet taste.
Simply put, nitrous oxide is the least non-toxic gas that is used for inhalational anesthetic purposes.
However, there are some mild side effects including dizziness and unconsciousness which occur after inhaling gas.
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Under what conditions of temperature and pressure would you expect gases to obey the ideal-gas equation?.
Learn ideal gas and temperature.
What is ideal gas?
In this situation, the ideal gas law, a state equation for all gases, holds true: The universal gas constant, 8.31446261815324 joules per kelvin per mole, and the number of moles of the gas, n, are used to calculate the potential energy, or PV, which is equal to nRT.
What is temperature?
The average kinetic energy of all the atoms or molecules in a substance is what we refer to as the substance's temperature. A substance's constituent particles do not all possess the same kinetic energy.
Since the potential energy from intermolecular forces becomes noticeably less when compared to the kinetic energy of the particle and the size of the molecules becomes noticeably less when compared to the empty space between them, a gas behaves like an ideal gas at higher temperatures and lower pressures.
Therefore, at both high and low pressures, gases adhere to the ideal-gas law.
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Which manufacturing process is shown in the photograph? PLEASE HELP, I NEED THIS DONE BY TODAY :(
A. Combining
B. Finishing
C. Casting
D. Seperating
The manufacturing process shown in the photograph is d)Separating.
The cutting process in metals is a process where a piece of metal is cut into a desired shape or size. This can be done using a variety of methods, but the most common method is using a cutting tool. This eventually lead to the separation of the metals
Cutting processes are operations in which the work piece is cut into smaller pieces using power-driven cutting tools. A variety of cutting processes are used in metalworking, including machining, broaching, sawing, shearing, and abrading.
Each process has advantages and disadvantages, and the best process to use depends on the work piece material, the work piece geometry, and the desired tolerances.
Through these tools, the metals could be cut and separated easily. Hence the correct answer is option d)
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how does the hybridization model account for the differences between the geometry of atomic orbitals (s and p orbitals) and observed molecular geometries?
Atomic orbitals undergo hybridization, which results in new orbital forms and spatial orientations.
In the localized valence bond theory, a mathematical method known as hybridization is used to construct sets of equivalent orbitals that are correctly orientated to form bonds from atomic orbitals that are similar in energy but not equivalent. Because they are created by combining (hybridizing) two or more atomic orbitals from the same atom, these new combinations are known as hybrid atomic orbitals.
By combining the beryllium 2s orbital with any of the three degenerate 2p orbitals in BeH2, we can create two equivalent orbitals.
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Mode for O2!!!!!!!!!!!!!
Answer:
There are 2 modes in O2.
O2 is dioxygen.
Explanation:
Two oxygen atoms joined together for dioxygen.
Also, for reference, the prefix "di" means "two," "twice," or "double."
what do you think are there different colors emitted?
Answer: If you are talking about waves, then that is because only one color gets reflected as all the others gets absorbed.
Explanation:
TL:DR
Light absorb sum other reflect.
What colored shapes gillian will not need for her model of the electron transport chain?.
The orange circle is the colored form that Gillian won't require for her version of the chain of electron transport.
Why do we need electrons?Many physical processes, such as gravity, electrical interactions, weak interplay, electricity, magnets, chemistry, & thermal conductivity, depend on electrons.
What do you mean by electron?A negatively charged particle known as an electron can either be free or attached to an atom (not bound). One of the three main types of atoms within an atom is an electron that is bonded to it; the other two were protons and neutrons.
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What is the approximate vapor pressure when the liquid water boils at about 50°C?
380 mmHg
760 mmHg
100 mmHg
5 mmHg
Answer:
380mmg
Explanation:
Can you please show all the steps with explanations.
The percentage purity of the chalk would be 88.82%.
What is percentage purity?The percentage purity of a compound is a measure of how pure the compound is.
In this case, the percent purity of the chalk is calculated as:
Percentage purity = mass of calcium carbonate/mass of chalk x 100%
From the equation of the reaction:[tex]CaCO_3 + 2 HCl --- > CaCl_2 + CO_2 + H_2O[/tex]
0.36 L of carbon dioxide was collected at STP.
Recall that: 1 mole of gas at STP = 22.4 L
Thus, 0.36 L of carbon dioxide at STP would be:
0.36/22.4 = 0.0161 mol
From the equation of the reaction, the mole ratio of carbon dioxide produced to calcium carbonate that reacted is 1:1. Thus, the equivalent mol of calcium carbonate that reacted would also be 0.0151 mol.
Molar mass of calcium carbonate = 100 g/mol
Mass of 0.0151 mol calcium carbonate = 0.0151 x 100
= 1.51 grams.
Percent purity of the chalk = 1.51/1.70 x 100
= 88.82%
The percentage purity of the chalk is, therefore, 88.82%.
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According to the Cahn-Ingold-Prelog (CIP) rules for assigning R and S configurations to stereocenters, which of the following substituents has the highest priority? A) -CECH B) -CH₂CH₂ C) -CH=CH₂ D) -CH
Should be aware of the R/S configuration CIP rules' priority ranking. A) -CECH (option A).
How would you define stereocenter?Stereocenter. An atom that is connected to four different atoms is known as a stereogenic center, and simply a stereocenter. A stereocenter, also known as a stereogenic center, is a particle group in which any two groups can be exchanged to produce a stereoisomer.
Is a stereocenter a chiral carbon?When a carbon is joined to four other atoms, or groups of atoms, chiral centers are created. Although they are mirror reflections of one another, chiral compounds are not identical. Stereocenters are also chiral centers, although not usually the other way around.
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methanol is fairly volatile and evaporates quickly if spilled. methanol is also absorbed quite readily through the skin. if, in the laboratory, methanol accidentally spilled on your clothing, why would it be a serious mistake to just let it evaporate?
Letting the evaporation of methanol will be a mistake due to its toxic nature.
Methanol belongs to the functional group alcohol. Being volatile, it evaporates quickly. Moreover, it also absorbed quickly through the skin. The compound is highly toxic and the intake should be completely avoided.
Some of the common problems associated with methanol toxicity are different organs like respiratory system, Central nervous system and cardiovascular system along with metabolic acidosis. The symptoms of methanol poisoning are CNS depression, headache, confusion, dizziness, failure in muscle coordination. The metabolism of methanol into formic acid results in end organ toxicity which may be lethal.
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What inference can be made about roger chillingworth’s character based on hester prynne’s reaction?.
Answer:
see picture
Explanation:
His name was announced as Roger Chillingworth. The jailer, after ushering him into the room, remained a moment, marveling at the comparative quiet that followed his entrance; for Hester Prynne had immediately become as still as death, although the child continued to moan.
–The Scarlet Letter,
Nathaniel Hawthorne
Does the author use direct or indirect methods to characterize Roger Chillingworth?
✔ indirect
Which method of indirect characterization does the author use to characterize Roger Chillingworth?
✔ Hester Prynne’s reaction
What inference can be made about Roger Chillingworth’s character based on Hester Prynne’s reaction?
✔ He is evil and intimidating.
based on the periodic table, which of the following groups of elements should have very similar chemical properties?
Groups of elements that should have very similar chemical properties are:
Lithium (Li)Sodium (Na)Potassium (K)Correct Answer: letter C.
This is because they are all in the same column of the periodic table.
What is the name of the column where these elements are located?This column is called the alkali metals. The alkali metals are the elements in group 1 of the periodic table. They are all very reactive, due to the fact that they only have one valence electron in their outermost energy level. This makes them very prone to losing that electron, which is why they are often found in compounds rather than in their pure form. The most common alkali metal is sodium, which is found in table salt.
Based on the periodic table, which of the following groups of elements should have very similar chemical properties?
Group of answer choices:
A. potassium (K), aluminum (Al), neon (Ne)
B. carbon (C), iodine (I), hydrogen (H)
C. lithium (Li), sodium (Na), potassium (K)
D. manganese (Mn), magnesium (Mg), molybdenum (Mo)
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12. Frequency (v) = 2 x 106 s-1
Find the Wavelength (A)
The wavelength when frequency is 2 x 10^6 s^-1 is 150 m.
What is wavelength?
The wavelength can be defined as the distance between any given point and the same point in the next wave which can be crest to crest or trough to trough. It can be represented by the symbol Lambda. It can be measured in the direction of the wave.
The wavelength can be calculated as,
A = c / v
where A is the wavelength, c is the speed of light and v is the frequency.
A = 3 x 10^8 m s^-1 / 2 x 10^6 s^-1 = 150 m.
Therefore, the wavelength of the wave with frequency 2 x 10^6 s^-1 is 150 m.
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which dating method would be most appropriate for establishing the age of a volcanic ash layer from an early hominid site in eastern africa? group of answer choices amino acid dating carbon 14 dating electron spin resonance dating potassium-argon dating
To find the dating method, learn all the types of dating method.
What is electronic spin resonance method?
In the presence of a static magnetic field, electron spin resonance (ESR), a spectroscopic technique, can detect transitions between the energy levels of electron spins caused by electromagnetic radiation.
What is dating method?
A technique called radiocarbon dating offers precise age estimates for carbon-based materials that come from living things. 1. The amount of carbon-14 in a sample can be measured and compared to an internationally accepted reference standard to estimate its age.
Therefore, we can conclude that it is electronic spin resonance method.
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S
Show how the total number of electrons for the third energy level can be determined by using the quantum numbers.
Use the paperclip button below to attach files.
Student can enter max 3000 characters
The element could be X is phosphorus .
What is element?
An element is the fundamental item that can't be easily broken onto smaller of pieces. In chemistry and physics, an elementary is a substance that can't be broken down by non-nuclear reactions. In computing and the mathematics, an element is the distinct piece of a larger system or set.
An ionic compound is formed by the ions, which their charges replaced, so the compound Na₂X is formed by the ions Na⁺ and X⁻². Thus, X must gain two electrons to be stable at the octet, so it has 6 valence electrons. Because it can accommodate up to 12 electrons, the element expands the octet, do it must be in the 3rd period or higher.
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an empty erlenmeyer flask that weighs 93.667g has a quantity of liquid vaporized in it at 96.4oc and a pressure of 1583.8 torr. the mass of the cooled flask is 94.345g. when the flask is filled with water, the mass of the flask and water is 268.92g. (a). determine the molecular weight of the unknown liquid. g/mol ** write answer in decimal form to one decimal place, no units in answer**
The question is not scientific as it measures weight with a unit of mass.
Mass of water filling the flask =268.92 g - 93.667 g = 175.25 g . Molecular weight of the flask = 175.25 g / (1.00 g/cm^3) = 284.4 cm^3.
A given molecule's mass, expressed in daltons, is known as its molecular mass. Because different isotopes of an element are present in different molecules of the same compound, their molecular masses can vary. The mass of a substance per mole is its molecular weight. Typically, grams per mole are used to measure this. Molecular weight, also known as molecular mass, is the mass of a substance's molecules, based on 12 as the carbon-12 atom's atomic weight. In real life, it is calculated by adding the atomic weights of the atoms in the compound's molecular formula. The properties of a polymer are inversely correlated with its molecular weight. Mechanical properties typically increase as the molecular weight does.
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A crucible is a severe test or trial. It is also a vessel in which materials are melted at high temperatures to produce a more refined substance. What do you think a crucible might symbolize in this drama?.
In this drama, a crucible would represent the constant building action leading to the climax of the pot.
What is crucible?
A crucible is a ceramic as well as metal vessel used to melt metals or subject other substances to extremely high temperatures. Crucibles can be made from any material that can withstand temperatures high enough to melt and otherwise change their contents, despite historically being most frequently made of clay. The crucible's shape has changed over time, with designs that take into account both regional variation and the process for that they are used. The earliest crucible forms date to Iran and Eastern Europe in the sixth or fifth millennia B.C.
Similar to the contents of a crucible, the characters seem to be constantly enduring severe trials; in this case, the witching trials. The crucible would, in my opinion, symbolize the town itself and its residents. The symbolism of this suggests a theme of the townspeople going through the witching trials and coming out with a "refined" lesson. The unnecessary accusations and trials will teach a hard lesson to the people who live within the town and influence their future.
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When planning an investigation of a chemical reaction that produces a
precipitate, which of the following conditions MUST be true?
Both products are soluble in water.
One of the reactants must be insoluble in water.
At least one product is insoluble in water.
Spectator ions are included in the solution as reactants.
The conditions that MUST be true when planning an investigation of a chemical reaction that produces a precipitate at least one product is insoluble in water is at least one product is insoluble in water.
What is a chemical reaction?A chemical reaction is a phenomenon in which two or more compounds react in a suitable medium such as water in order to form one or more product molecules. This process generates a precipitate when water is the surrounding media for insoluble compounds.
Therefore, with this data, we can see that a chemical reaction may involve the formation of a precipitate when the compound is insoluble.
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Which of the following statements correctly describe wave-particle duality?
a. matter and energy are different forms of the same entity.
b. energy and mass can be interconverted.
c. all matter exhibits wavelike motion.
Wave-Particle Duality theory states that all matter exhibits wavelike motion.
According to the Wave-Particle Duality theory, both particles and waves can have characteristics that are similar to one another. This definition is opposed to Newtonian physics or classical mechanics. De Broglie (1892-1987) put up a solution to this quandary in 1924. He believed that waves characterize all moving objects. He combined linear momentum with the Planck constant.
E = hv = hc/λ
so
λ=hcE........(1)
and
p = E/c = mv
(p is the momentum of the object, m is the object's mass, and v is the velocity of the object) so
E = mvc
Plug this into (1), we have
λ = hc/mvc = h/mv
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when an oil sample analysis indicates elevated levels of silicon, which of the following should be inspected first?
Must first be inspected in oil sample analysis, low pressure intake circuit for leaks. Correct asnwer: letter C.
How does oil analysis help prevent engine damage?
Oil analysis helps prevent engine damage by identifying potential problems and addressing them before they cause major damage. By monitoring the health of your engine oil, you can avoid costly repairs and extend the life of your engine.
Some ways to prevent engine damage from occurring include:
Regularly changing your oilUsing the proper oil for your engineMaintaining proper engine operating temperaturesAdditionally, oil analysis can help identify potential problems early on, allowing you to take corrective action before major damage occurs.
The group of options with respect to the question, which of the following should be inspected first? Son:
A) Tribology
B) engine off, engine hot: syringe at mid-sump level
C) low pressure intake circuit for leaks
D) thick film and boundary
Correct answer: letter C.
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what is not true of fuels? group of answer choices they are found in three basic states they can only be volatilized and consumed in the liquid state * they are characterized as any substance that will burn or support combustion wood does not burn
The statement which is not correct about Fuel is that wood does not burn.
Hence, option D is not correct
What do you mean by Fuel?
Fuel can be defined as any substance that upon combustion produces a usable amount of energy which is generally known as fuel.The characteristics of good fuel includes that it should have a high calorific value, environment-friendly and should burn completely without leaving any residue. Fuel should be cheap and readily available. The burning of wood will include an indirect reaction.
Examples include : wood, coal, biogas, LPG, petrol, diesel etc.
Types of Fuels:
Solid Fuels.Liquid Fuels.Gaseous Fuels.Hence, The statement which is not correct about Fuel is that wood does not burn.
Hence, option D is not correct
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