Nitrogen has a normal boiling point of 77.4 K and a melting point (at 1 atm) of 63.2 K. Its critical temperature is 126.2 K, and its critical pressure is 2.55 * 104 torr. It has a triple point at 63.1 K and 94.0 torr.
What is the triple point?The temperature and pressure at which the solid, liquid, and vapour phases of a pure substance can coexist in equilibrium.
- Normal melting point: 63.2 K.
- Normal boiling point: 77.4 K.
- Triple point: 0.127 atm and 63.1 K.
- Critical point: 33.5 atm and 126.0 K.
In such a way:
- N2 does not exist as a liquid at pressures below 0.127 atm: that is because below this point, solid N2 exists only (triple point).
- N2 is a solid at 16.7 atm and 56.5 K: that is because it is above the triple point, below the critical point and below the normal melting point.
- N2 is a liquid at 1.00 atm and 73.9 K: that is because it is above the triple point, below the critical point and below the normal boiling point.
- N2 is a gas at 0.127 atm and 84.0 K: that is because it is above the triple point temperature at the triple point pressure.
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Continued depletion of the ozone layer will most likely result in:.
Answer:
More radiation entering the earth's atmosphere.
Explanation:
The ozone layer is layer of O₃ (oxygen) and prevents most radiation from reaching earth.
Consider this reaction: h2s hno3 right arrow. s no h2o reduction half-reaction: n 5 3e- right arrow. n 2 oxidation half-reaction: s-2 right arrow. s 2e- after balancing the chemical equation, what are the coefficients for these compounds? h2s hno3
The coefficients of H2S and HNO3 in the balanced reaction equation are 2 and 3 respectively.
Chemical reactionIn a chemical reaction, reactans interact in a unique way to form products. In this case, the unbalanced reaction equation is; H2S + HNO3-----> NO + H2O.
Since this reaction is redox and electrons are lost/gained in the process, the coefficients of H2S and HNO3 in the balanced reaction equation are 2 and 3 respectively.
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Answer:
Explanation:
1st: 3
2nd: 2
An elemental gas has a mass of 10. 3g. If the volume is 58. 4 l and the pressure is 758 torr at a tempertaure of 2. 5 c what is the gas
The required elemental gas which has a mass of 10.3 g in the given conditions is helium gas.
How do we calculate molar mass?Relation between the molar mass and moles of any substance will be represented as:
n = W/M, where
W = given massM = molar massMoles of gas will be calculated by using the ideal gas equation:
PV = nRT, where
P = pressure = 758 torrV = volume = 58.4Ln = moles = ?R = universal gas constant = 62.363 L.torr / K.molT = temperature = 25 degree C = 298KOn putting all values, we get moles
n = (758)(58.4) / (62.363)(298) = 44,267.2 / 18,584.2
n = 2.38 moles
Molar mass of the gas will be calculated by using the above first equation is:
M = 10.3g / 2.38mol = 4.32 g/mol = 4g/mol (approx)
Hence given elemental gas is helium.
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List all of the ions present in solution when the following strong
electrolyte compound is dissolved in water
Co3(PO4)2
Answer:
Co²⁺ and PO₄³⁻
Explanation:
Strong electrolytes completely dissolve in water. Therefore, the ionic bonds between the cation and anion in Co₃(PO₄)₂ would break apart. The resulting ions would be Co²⁺ and PO₄³⁻. The phosphate (PO₄³⁻) would NOT further seperate because the phorphorus and oxygen bonds are covalent, not ionic. Phosphate ions are a type of polyatomic ion (ions which have covalent bonds).
Which type of organism transfers the most energy in a food web?
F. Consumer
G. Producer
H. Decomposer
J. Prey
Answer:
Producers.
Explanation:
Since the source of energy is the sun, the trophic level representing producers contains the most energy.
stoichometry in chemistry!! please someone help i'm begging you, if i fail this then i fail chemistry
Answer:
You can find in the given attachemnet
The diagram is an example of which of the following..
a) an alkyne
b) an alkane
c) an aldehyde
d) an alkene
Thats an alkane.
Option B.
Answer:
option b) is the answer ..that an alkane
What current (in a) is required to plate out 1. 22 g of nickel from a solution of ni2 in 0. 50 hour?
The current required to accumulate the 1.22 grams of nickel in 0.5 hours is 2.23 A.
What is current?The current is given as the product of the charge with time. In the electrochemical analysis of the nickel, there will be a reduction of the nickel ion to nickel. The formation is given as:
[tex]\rm Ni^{2+}+2e^-\;\rightleftharpoons Ni[/tex]
There is the deposition of 1 mole of Ni with 2 electrons transfer. The transfer of charge for 1 mole that is 58.7 grams Nickel is:
[tex]\rm 58.7\;g=2\;\times\;96487\;C\\58.7\;g=192974\;C[/tex]
The mass of Ni to be deposited is 1.22 grams. The charge required is given as:
[tex]\rm 58.7\;grams\;Ni=192974\;C\\\\1.22\;grams\;Ni=\dfrac{192974}{58.7}\;\times\;1.22\;C\\\\1.22\;grams\;Ni=4010.7\;C[/tex]
The current required to transfer 4010.7 C of charge in 1800 seconds is given as:
[tex]\rm Charge=Current\;\times\;Time\\4010.7\;C=Current\;\times\;1800\;sec\\Current=2.23\;A[/tex]
Thus, the current required to accumulate the 1.22 grams of nickel in 0.5 hours is 2.23 A.
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The definition of the acceleration states that an object accelerates when it
Answer: Acceleration and velocity
Explanation:
Newton's second law says that when a constant force acts on a massive body, it causes it to accelerate, i.e., to change its velocity, at a constant rate. In the simplest case, a force applied to an object at rest causes it to accelerate in the direction of the force.
Answer:
Moving with changing velocity
Explanation:
the resultant force acting on it is not zero
hence
Chemical bonds are formed when potential energy is when it’s High or Low?
Answer:
high I think
Explanation:
i just did it
Answer:
Bond forms to get stability. Stability will be maximum at low potential energy. So, in bond formation, atoms loose their potential energy to get stabilized and heat is evolved. Generally bond formation is also an exothermic reaction
Approximately how long has a victim been dead if their body temperature is 13.5C degrees? 50-52hrs 47-48hrs 33-34hrs 35-36hr
Alkanes contain the maximum possible amount of hydrogen, they are known as being __________. What one word completes the sentence?
Alkanes contain the maximum possible amount of hydrogen, they are known as being saturated hydrocarbon.
What is alkanes?The easiest category of hydrocarbons would be the alkanes. They exclusively possess hydrogen as well as carbon. So every hydrogen atom produces one link, while each carbon atom generates four.
What is hydrocarbon?When all of a hydrocarbon's carbon-carbon bonds possess single bonds, the hydrocarbon was said to have been saturated. A hydrocarbon would be an organic substance with only carbon as well as hydrogen as its components.
Therefore, alkanes contain the maximum possible amount of hydrogen, they are known as being saturated hydrocarbon.
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Nuclear fission is the combining of small nuclei into larger ones
Answer:
False.
Explanation:
The combining of the nuclei of atoms is known as nuclear fusion.
The statement that nuclear fission is the combining of small nuclei into larger ones is false.
What is nuclear fission?Nuclear fission is a process in which one nucleus splits into two or more small nuclei. The process release large amount of energy and produce gamma photons.
Opposite to it, Nuclear fusion is a process of combining of small nuclei into larger ones.
Thus, the statement is false, because nuclear fission is a process of splitting of a nucleus.
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Potassium carbonate (K2CO3) has one potassium atom bonded to carbon, and that carbon is also bonded to three oxygens. Their electronegativities are shown in the list:
K: 0.82
C: 2.55
O: 3.44
How would you describe the bonds (K–C and C–O) in this molecule?
1: K-C is iconic, and C-O is covalent
2: K-C is iconic, and C-O is nonpolar covalent
3: K-C is polar covalent, and C-O is nonpolar covalent
4: K-C is polar covalent, and C-O is polar covalent
Answer:
Based on the electronegativity difference between them, K-C is ionic, and C-O is polar covalent.
What is a bond?
A bond is formed by the interaction of two atoms. A bond can be either ionic or covalent.
Now we have to look at the electronegatives on each bond. The electronegativity difference between the K-C bond is larger than that between the C-O bond hence, K-C is ionic, and C-O is polar covalent.
Explanation:
What does the radical do in a seed of a plant
[tex]\huge{\green}\fcolorbox{blue}{cyan}{\bf{\underline{\red{\color{red}Answer}}}} [/tex]
It is the embryonic root inside the seed. It is the first thing to emerge from a seed and down into the ground to allow the seed to suck up water and send out its leaves so that it can start photosynthesizing. The radicle emerges from a seed through the micropyle.MULTIPLE CHOICE QUESTION
Which of the following is an example of a
chemical change?
An iron nail forming rust
Tearing paper into many little pieces
Steam coming out from boiling water
Mixing sand with sugar
Dissolving coffee powder in hot water
Answer:
rust
Explanation:
Chemical rxn of iron and oxygen = rust
A gas has a volume of 840 mL at -38°C and a pressure of 0.98 atm. If the pressure
changes to 1.37 atm when the gas is heated to 16°C, what is the new volume?
Answer:
X is an element in period 3 with two electrons in the outer shell. Draw a full diagram of the ion form by this element
You were task to cook rice for your family's dinner. After few minutes, you noticed that steam is coming out from the cooking pot. What do you call that process?
A. Insulation
B. Convection
C. Conduction
D. Heat transfer
Answer:
Convection
Explanation:
Convection is steam and the condensation of vapor.
the outermost layer of earth's atmosphere is
Answer: Exosphere
Explanation:
Answer:
exosphere
Explanation:
the outermost layer of earth's atmosphere is called exosphere
If 10 grams of potassium chlorate decompose to form potassium chloride and oxygen gas inside a 500 mL container at a temperature of 45 °C. what will the pressure be inside the container?
Answer:
10 atm
Explanation:
There's a lot to do here, but lets take it one step at a time. First, let's write a balanced equation for the decomposition of potassium chlorate into potassium chloride and oxgyen gas.
2 KClO3 → 2 KCl + 3 O2
Now let's find the moles of the KClO3 (molar mass 122.55 g/mol) that we have take 10 g/122.55 g/mol, grams will cancel and we are left with 0.0816 moles. lets divide that by two since we have a two in front of the KClO3 in the equation, and then multiply that number by 5 since it's the total moles of products, in summary, multiply by 5/2 to get 0.204 moles.
Now that we know the moles of our products, let's plug some stuff into the ideal gas law PV = nRT. We are looking for P so let's solve for that. P = (nRT)/V, now let's plug in our values. Make sure V is converted to liters so 0.5 L. And convert celcius to kelvin by adding 273
P = ((0.204 moles)(318 K)(0.08206 L atm mol^-1 K^-1))/0.5 L
A lot of units cancel, and we get about 10.65 atm, if you don't want the answer in atm, you can find a conversion equation. But let's round to sig figs for now, which will bring us to 10 atm.
How to find hydrogen ion concentration from molarity of solution
The concentration of the hydrogen ions from molarity can be given with the number of hydrogen atoms in the molecular formula.
What is molarity?Molarity is given as the moles of the solute present in a liters of solution. The compound with the number of hydrogen atoms in the molecular formula with degradation possesses the equivalent concentration of the hydrogen ions.
The compound with molecular formula AH having molarity 2, will produce 2M of hydrogen ions.
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PLEASE HELP DUE IN 15!!!!!!! WILL GIVE BRAINLIEST!!
Question 12:
How many grams of NaOH are present in 7.54 moles of NaOH. (The molar mass of NaOH is 39.997 grams/mol)
a. 0.19 grams of NaOH
b. 32.5 grams of NaOH
c. 5.30 grams of NaOH
d. 301.6 grams of NaOH
This next step is going to take some skill and some careful observation. the wave speed is associated with the movement of crests and troughs along the medium. faster waves will have crest s that move from the left side of the screen to the right side of the screen in less time; that is the crests move from left to right faster . set the animation to a low frequency (about 0.1 hz) and observe the wave speed. it might help to put your finger o r a pen cap on a crest and follow move your finger (or pen cap) from left to right along with the crest. then repeat for a high frequency (about 1.0 hz) . make the same observation of wave speed - the speed of the crest moving from let to right across the s creen. does this ten - fold increase in frequency - from about 0.1 hz to about 1.0 hz - have any noticeable and appreciable effect upon the wave speed? explain your answer and discuss your observations.
The speed of the wave increases as the frequency of the wave is increased from 0.1 Hz to 1.0 Hz.
What is the relationship between wave speed and frequency?The speed of a wave of a given wavelength is directly proportional to its frequency.
An increase in the frequency of a wave results in a proportional increase in the speed of the wave of the wavelength remains the same.
In the animation, as the frequency of the wave is increased from 0.1 Hz to 1.0 Hz, the speed of the wave is observed to increase as the time taken for the crests and troughs to move across the screen becomes smaller.
Therefore, the speed of the wave increases as the frequency of the wave is increased from 0.1 Hz to 1.0 Hz.
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In general, the rate of evaporation increases with ___________.
Answer:
heat increase, pressue loss, altitude gain,
Explanation:
Write the reaction for the weak base co32- in water
The weak base carbonate reacts with the water forming bicarbonate and the hydroxide ion.
What is a weak base?The weak bases are given as the compounds that have the inability to get completely dissociated in water.
The carbonate is given as the weak base, as in water it remains constituted in the form of a bond with oxygen.
The reaction of water with the carbonate ion is given as:
[tex]\rm CO_3^{2-}\;+\;H_2O\;\rightleftharpoons HCO_3^-\;+\;OH^-[/tex]
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students mixed two liquids in a beaker and listed their observations
> Liquid 1 was colorless
> Liquid 2 was colorless
> The mixture of liquids 1 and 2 formed a colorless solution
> small, solid particles formed and fell to the bottom of the beaker
based on these observations, which statement contains the best evidence that a chemical reaction occurred?
A. There is a change in shape
B. there is a change in volume
C. the two liquid mix into a solution
D. the two liquids made a new substance
The two liquids made a new substance.
What is a physical and chemical change?A chemical change results from a chemical reaction, while a physical change is when matter changes forms but not chemical identity.
A chemical change occurs when some substances are transformed into different substances, with different nature and properties. In this case when both liquids are mixed a solid is formed. This is an example of a change of state of the liquids reactants to the solid product, which has properties and characteristics different from that of the initial liquids of the mixture which is called a chemical change.
Hence, option D is correct.
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a seashell composed largely of calcium carbonate reacts with a solution of HCl . As a result, 1500 ml of dry co2 gas at stp. How many grams of caco3 are consumed at the reaction
The amount of CaCO₃ that are consumed at the reaction is 6.7 grams.
What is ideal gas equation?Ideal gas equation will be represented PV = nRT from which we can calculate the moles of carbon dioxide, where
P = standard pressure = 1 atmV = standard volume = 1500mL = 1.5LT = standard temperature = 273 KR = universal gas constant = 0.082 L.atm/K.molOn putting all these values, we get
n = (1)(1.5) / (0.082)(273) = 0.0669 moles = 0.067 mol
Given chemical equation is:
CaCO₃ + 2HCl → CO₂ + CaCl₂ + H₂O
From the stoichiometry of the reaction it is clear that,
1 moles of CO₂ = produced by 1 moles of CaCO₃
0.067 moles of CO₂ = produced by 0.067 moles of CaCO₃
Now mass of CaCO₃ will be calculated as:
n = W/M, where
n = moles = 0.067molW = required mass = ?M = molar mass = 100g/molW = (0.067)(100) = 6.7g
Hence required mass of CaCO₃ is 6.7g.
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The increase in boiling point from CH4, SiH4, GeH4 to SnH4 is caused by the increase in strength of which type of intermolecular force?
Methane (CH4) with the smallest atomic size, would have the lowest boiling point.
What is Boiling point ?It is the temperature at which the pressure exerted by the surroundings upon a liquid is equaled by the pressure exerted by the vapour of the liquid; under this condition, addition of heat results in the transformation of the liquid into its vapour without raising the temperature.
CH₄, SiH₄, GeH₄, SnH₄ are very similar. They are all in the same group and their molecular geometry is a tetrahedral.
They have covalent bonds. The key difference: The number of protons and electrons.
These are non-polar molecules, so there are no ionic bonds. There are no H bonded to a F, N or O, so there is no hydrogen bonds.
Dipole induced dipole forces (AKA London dispersion forces) dictate the boiling points of these atoms. It is the attraction between atoms that dictate how easily they can disperse.
The electrons in an atom are constantly moving due to their repulsion of each other. However, if one electron has moved and the other has not, it is temporarily charged.
The biggest molecule will have the highest boiling point. The more protons and electrons, the stronger the effect.
Therefore, Methane (CH4) with the smallest atomic size, would have the lowest boiling point.
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What is the entropy change if one mol of water is warmed from 0 c to 100 c
The entropy change if one mole of water is warmed from 0 degree C to 100 degree C is 1,316.7 J/K.
How do we calculate the entropy change?Change in entropy will be measured by using the below equation as:
ΔS = (n)(Cp)ln(T₂/T₁), where
n = moles of water = 1 mol
Cp = specific heat of water = 4180 J/mol.K
T₂/T₁ = ratio of temperatures in K = 373 / 273 = 1.37 K
On putting values, we get
ΔS = (1)(4180)ln(1.37) = (4180)(0.315)
ΔS = 1,316.7 J/K
Hence required value of entropy is 1,316.7 J/K.
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under what conditions can calcium bromide conduct electricity