Hydrogen peroxide is a colorless liquid at room temperature with a bitter taste. Small amounts of gaseous hydrogen peroxide occur naturally in the air.
Since it easily breaks down into oxygen and water and releases heat, hydrogen peroxide is unstable. Despite not being flammable, it has a strong oxidising agent that, when in contact with organic material, can trigger spontaneous combustion. For medical purposes, as well as for usage as a clothing and hair bleach, hydrogen peroxide is present in many homes in low amounts (3–9%). Higher quantities of hydrogen peroxide are employed in the manufacturing of organic compounds, foam rubber, and rocket fuels in addition to being utilised as a bleach for paper and textiles.
With disinfecting, antiviral, and antibacterial properties, hydrogen peroxide is a peroxide and oxidising agent. Hydrogen peroxide's oxidising activity manifests itself upon topical administration, rinsing, and generation of free radicals, which causes oxidative damage to proteins and other biological molecules.
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rutherfordium-257 was synthesized by bombarding cf-249 with c-12 . enter the nuclear equation for this reaction. express your answer as a chemical equation.
Rutherfordium-257 was synthesized by bombarding Cf-249 with C-12 . the nuclear equation for this reaction is :
²⁴⁹Cf₉₈ + ¹²C₆ ---> ²⁵⁷Rf₁₀₄ + 4¹n₀
carbon :
atomic number = 6
mass number = 12
californium :
atomic number = 98
mass number = 249
Rutherfordium :
atomic number = 104
mass number = 257
The nuclear reaction is given as :
²⁴⁹Cf₉₈ + ¹²C₆ ---> ²⁵⁷Rf₁₀₄
reactant product
atomic number 104 104
mass number 261 257
the mass is not balance to balance the mass number we have to add with mass number 1 and atomic number 0.
²⁴⁹Cf₉₈ + ¹²C₆ ---> ²⁵⁷Rf₁₀₄ + 4¹n₀
Thus, the above nuclear reaction is called as nuclear fission.
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Calculate the frequency of the light emitted when an electron in a hydrogen atom makes each of the following transitions.
a. n = 4¡n = 3
b. n = 5¡n = 1
c. n = 5¡n = 4
d. n = 6¡n = 5
The frequency of the light emitted when an electron in a hydrogen atom makes each of the following transitions energy of the electron in the nth state is En = -2.18 x 10-18J for the n = 4¡n = 3
Therefore, when an electron transitions from nito to ng, the energy of the emitted photon is the energy of the electron in the two associated states.
Ephoton = AE = En:- En = -2.18 x 10-1810-18 / 1The frequency (\nu) can be calculated from the photon energy asEphoton = hvV = Ephoton here h is Planck's constant.Coming to a given transition, we can calculate the frequency as follows:a. n=4 to n=3.lPhoton energy can be calculated as1Ephoton = AE = En:- En, = -2.18 x 10-18* 10-18> Ephoton = -2.18 x 10-1811.06 x 10-19From this the photon frequency is calculated as» - Epaten -1.06 x 10-19 )6.626 x 10-34 J. 1.60 1014 -1b. n=5 to n=1.Photon energy can be calculated as follows 1Ephoton = AE = En:- En = -2.18 x 10-188 x 10-18→ Ephoton = -2.18 x 10- 18 2.09 10-18 ]So the photon frequency can be calculated asc. n=5 to n=4.The photon energy can be calculated as , the photon frequency can be calculated as n=6 to n=5.The photon energy can be calculated as2.66 x 10-20Read more about photon:
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Which is more Electropositive Zn or Cu?
Because copper is more electronegative and zinc is more electropositive zinc will act as the anode and copper will act as the cathode in a battery.
The positive electrode, copper, is negatively charged from the excess electrons at the expense of the negative electrode, zinc, which becomes positively charged. Although we say that copper is the positive pole and zinc is the negative pole, in reality, the transition of electrons will happen against electrostatic forces, not following them. Compared to copper metal, zinc metal loses its outer electrons more readily. Zinc will act as the anode and copper will act as the cathode in a battery. Alkali metals are well-known for being extremely electropositive because they are easily capable of losing one electron to take on the properties of a noble gas. Due to their transition element status, Cu and Cr are less electropositive than alkali metals. The positive electrode is copper, and the negative electrode is zinc.
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What is the solubility of sugar in 100 g of water at 20 Celsius?
The solubility of sugar in 100 g of water at 20 degrees Celsius is 204g. The water's temperature has an impact on solubility. at standard temperature (roughly 20 degrees C),
In 100 mL of water, 203.9 grammes (or 200 grammes) of sugar can be dissolved. The water's temperature has an impact on solubility. You may dissolve 203.9 grammes (or 200 grammes) of sugar in 100 mL of water at normal temperature (about 20 degrees C). Up to around 500 grammes of sugar will dissolve in 100 mL of water at 100 degrees Celsius as water temperature rises. The concentration of the sucrose solution rises as the temperature rises. 100 ml of water will dissolve 175 g of sucrose at 0 °C.
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approximately how long after the big bang did the era of nucleosynthesis end, marking the time when the basic chemical composition of the universe was determined?
The Era of nucleosynthesis lasted until 3 minutes after the Big Bang. This predicted by Big Bang theory.
The Nucleosynthesis is the creation of new atomic nuclei. the centers of atoms that are made up of protons and neutrons. Nucleosynthesis first occurred within a few minutes of the Big Bang. At that time, a quark-gluon plasma, a soup of particles known as quarks and gluons, condensed into protons and neutrons.
According to the the Big Bang Nucleosynthesis theory it is predicted that roughly 25% the mass of the Universe consists of Helium. It also predicts about 0.01% deuterium and even smaller quantities of lithium. the prediction depends critically on the density of baryons at the time of nucleosynthesis. In terms of the present day critical density of matter is the required density of baryons is a few percent. This relatively low value means that not all of the dark matter can be baryonic.
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The era of nucleosynthesis ended approximately 3 minutes after the Big Bang, marking the time when the basic chemical composition of the universe was determined.
During this era, the universe was cool enough for protons and neutrons to combine to form the nuclei of the lightest elements, including hydrogen, helium, and a small amount of lithium. This process, known as "big bang nucleosynthesis," was crucial for establishing the basic chemical composition of the universe. After this era ended, the universe continued to expand and cool, and more complex elements were eventually formed through other processes, such as nuclear fusion in stars.
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3.45 x 10^24 molecules of Ba(OH)2 is how many liters
Its original definition of molecule is, "the smallest unit of a substance that yet preserves the qualities of that substance," was intended to be encompassed by this designation. 3.45 x 10²⁴ molecules of Ba ( OH )₂ is 5.9 liters.
What is molecule ?According to the context, the term may or may not include ions that meet this requirement. A molecule is a collection of two or more atoms held together by the attractive forces known as chemical bonds.
"An atom is a body that cannot be cut in two; a molecule is the smallest conceivable component of a specific substance," wrote James Maxwell in 1873 when defining atom and molecule.
1 moles Ba ( OH )₂ = 171.34168 gram
Then,
3.45 x 10²⁴ molecules of Ba ( OH )₂
= 591.1 mole
= 5.9 liter
Thus, 3.45 x 10²⁴ molecules of Ba ( OH )₂ is 5.9 liters.
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The different geometries that a molecule can attain by bond rotations and bends are called conformations.T/F
The different geometries that a molecule can attain by bond rotations and bends are called conformations: True.
A molecule is a collection of or greater atoms held together by means of appealing forces known as chemical bonds; depending on context, the time period may also or may not consist of ions which satisfy this criterion.
The smallest particle of any substance that could exist independently and retain the physical and chemical homes of the substance, made up of 1 or unique elements is a molecule. Molecules are divisible into atoms similarly. as an instance, oxygen atom is represented as O, oxygen molecule is represented as O2.
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What is the volume of STP?
The volume at STP is 22.4 L.
By using the ideal gas equation we get :
P V = n R T
V = n R T / P
given that :
pressure, P = 1 atm
n = moles = 1 mol
R = gas constant = 0.0823 atm L / mol K
T = temperature = 273.15 K
putting the values in the formula , we get :
V = n R T / P
V = (1 × 0.0823 × 273.15 ) / 1
V = 22.4 L
Thus, the volume at standard temperature and the pressure condition is is 22.4 L.
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As a system reaches thermal equilibrium, _____ has been transferred from areas of high to low _____.
A system has transferred thermal energy from hot to cold regions as it reaches thermal equilibrium.
Define thermal equilibrium and provide instances.When the powertrain temperature reaches thermal equilibrium over time, it does so when it reaches parity with the ambient temperature. The temperature of a cup of hot tea is equal to the ambient temperature when it is placed on the table and following a brief interval. The thermal equilibrium is at this point.
The equation for thermal equilibrium is what?At the same temperature are objects that are in thermal equilibrium. At a fixed temperature, the Neumann free energy equation (F = U - TS), also known as the thermal equilibrium equation, illustrates how much energy is available in a system to perform beneficial work.
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nitrogen gas can be prepared by passing gaseous ammonia over solid copper(ii) oxide at high temperatures. the other products of the reaction are solid acoper and water vapor. if a sample containing 18.1 g of nh3 is reacted with 90.4g of cuo whcih is the limiting reactant? how many grams of n2 will be formed?
10.6g of N2 will be produced as a result when a sample containing 18.1 g of nh3 is reacted with 90.4g of CuO which is the limiting reactant.
2 NH3(g) + 3 CuO(s) ⟶ N2(g) + 3 Cu(s) + 3 H2O(g)
To calculate moles as
18.1g NH3 X 1mol NH3/17g NH3 = 1.06mol NH3
90.4g CuO x 1mol CuO/79.5g CuO = 1.14mol CuO
Given the limiting reactant 1.06mol NH3 x 3mol CuO/2mol NH3 = 1.59mol CuO is required
Since 1.14mol CuO is present it is limiting
Required is 3mol CuO/2mol NH3 =1.5 and obtained is 1.14mol CuO/1.06mol NH3 = 1.08
Mass of N2 produced = 1.14mol CuO x 1mol N2/3mol CuO x 28g N2/1mol N2= 10.6g N2
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what are the molality and mole fraction of solute in a 21.5 percent by mass aqueous solution of formic acid (hcooh)? molality
The molality and mole fraction of solute in a 21.6 percent by mass aqueous solution of formic acid are 5.98mol and 0.097 respectively.
21.6 %m/m = 21.6 g HCOOH dissolved in (100 g - 21.6 g=) 78.4 g H2O
Molar mass of HCOOH = 46.03 g/mol
Mol in 21.6 g = 21.6 g / 46.03 g/mol = 0.4692 mol
78mol HCOOH dissolved in 1000g water= (1000g/78.4g)0.4692 mol
Molality= 5.98mol in 1.0 kg water.
Molar mass H2O = 18 g/mol
Mol H2O in 1000 g = 55.55 mol
Total moles in solution = 5.98mol+55.55mol= 61.53mol
Mol fraction HCOOH = 5.98 mol / 61.53 mol = 0.097
What is molality?
Molality is a measure of the number of intelligencers of solute in a result corresponding to 1 kg or 1000 g of detergent.To know more about molality, click the link given below:
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the atomic masses of nitrogen-14, titanium-48, and xenon-129 are 13.999234 amuamu , 47.935878 amuamu , and 128.904779 amuamu , respectively. part a calculate the nuclear masses of all three isotopes. express your answers in atomic mass units to six decimal places separated by commas. m(14n)m(14n) , m(48ti)m(48ti) , m(129xe)m(129xe)
The sum of an element's mass number and its number of protons and neutrons is given by the formula mass number = protons + neutrons. Simply deduct the number of protons, or atomic number, from the mass number to get how many neutrons an atom has.
How can the atomic mass of Class 11 be determined?
The number of protons and neutrons in an atom are simply added to determine the atomic mass of that particular atom. Consider an oxygen atom, for instance, which has 8 electrons, 8 protons, and 8 neutrons. You only need to multiply the atomic mass of oxygen by 8 protons and 8 neutrons.
How can the atomic mass of Class 9 be determined?
The atomic mass of a single atom can be determined by summing the total masses of the protons and neutrons in that particular isotope since their combined masses make up nearly all of the mass of the given atom.
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The atmic masses of nitrogen, titanium, xenon are 14.1154amu, 48.38523amu, 130.042455amu
1.Atomic Mass of ₇N¹⁴=13.99amu
Mass of proton=1.0072amu
Mass of neutron=1.00865amu
A nucleus contains only protons and neutrons.N¹⁴ contains 7 protons and 7 neutrons i.e. total 14 nucleons.
Total mass of protons and neutrons =Nuclear mass
(7*1.0072amu)₊(7*1.00865amu)=14.1154amu
2.Given ₂₂N⁴⁸=47.935878 amu
protons=1.00727amu
mass of neuron=1.008665amu
It contains 22 protons and 26 neutrons
Total mass of protons and neutrons =Nuclear mass
(22*1.00727amu)+(26*1.008665amu)=48.38523amu
3.Similarly atomic mass of xenon is 130.042455amu
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What is the pH of a substance that has an equal number of hydrogen ions and hydroxide ions?
7 is the pH of a substance that has an equal number of hydrogen ions and hydroxide ions.
In its purest form, a hydrogen ion is only the hydrogen atom's nucleus without the electron that normally accompanies it. The proton, a particle with a single positive electric charge that makes up the hydrogen nucleus, is what makes hydrogen atoms. As a result, a proton is typically represented by the single hydrogen ion, denoted by the sign H+. The solitary hydrogen ion can only exist in a space that is almost devoid of particles (high vacuum) and in the gaseous state because the bare nucleus can easily join with other particles (electrons, atoms, and molecules). In everyday speech, the term "hydrogen ion" is used to describe the ion that makes up the coupled molecule H+H2O and is found in water solutions.
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You are working in the lab with your group and you notice the sweater on the mannequin next to you catches on fire. What is the appropriate course of action? O Tell the mannequin she deserves it for wearing a sweater in such warm weather. o Laugh hysterically because it's not a real person O Push the mannequin on the ground and roll it back and forth to suppress the flames. O Pour flammable liquid on the dummy. Run around the room screaming "Fire, Fire!!!"
The chemical can be really harmful and also flammable so when the fire is caught then the appropriate action is to push the mannequin on the ground and roll it back and fourth to suppress the flames.
What would you use right away if your clothes started on fire?
Use the drop-and-roll method to put out a fire in burning clothing, douse it in cold water, or, if an emergency shower is nearby, use it.
If a chemical spill has affected your clothing, you should _____?
removed right after, and the skin should be thoroughly rinsed with water for at least fifteen minutes. Before being worn again, clothes must be cleaned. If a flammable, volatile substance is spilled, alert everyone right away, put out any flames, and ventilate any area.
The chemical can be really harmful and also flammable so when the fire is caught then the appropriate action is to push the mannequin on the ground and roll it back and fourth to suppress the flames.
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How do you predict which bond is shorter?
The length of the bond is determined by the number of bonded electrons (the bond order). The higher the bond order, the stronger the pull between the two atoms, and the shorter the bond length.
An enduring attraction between atoms or ions known as a chemical bond is what allows molecules and crystals to form. The bond may be created by the sharing of electrons in covalent bonds or by the electrostatic attraction of two oppositely charged ions, as in ionic bonds. Covalent, ionic, and metallic bindings are examples of "strong bonds" or "primary bonds," whereas dipole-dipole interactions, the London dispersion force, and hydrogen bonding are examples of "weak bonds" or "secondary bonds." The sharing or transfer of electrons between the involved atoms results in strong chemical bonds.
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Pressure has little effect on the solubility of liquids and solids because they are almost incompressible.t/f
Liquids and solids exhibit practically no change of solubility with changes in pressure.
As expected, gases increase in solubility with increasing pressure. Henry's Law states that the solubility of a gas in a liquid is directly proportional to the pressure of that gas above the surface of the solution.
In chemistry, solubility is the ability of one substance (solute) to form a solution with another substance (solvent). Insolubility is the opposite property, the inability of a solute to form such a solution.
The solubility of a substance in a particular solvent is usually measured as the concentration of the solute in the saturated solution beyond which the solute cannot dissolve. At this point, the two substances are said to be in solubility equilibrium. For some solutes and solvents, there may be no such restriction, in which case the two substances are said to be "miscible in all proportions" (or simply "miscible") [2 ].
Solutes can be solids, liquids, or gases, while solvents are usually solids or liquids. Both can be pure substances or solutions. Gases are always miscible in all proportions except in very extreme circumstances, and a solid or liquid can only be "dissolved" in a gas by first going to the gaseous state.
Solubility is primarily dependent on solute and solvent composition (including pH and the presence of other solutes), temperature, and pressure. This dependence can often be explained by interactions between two particles of matter (atoms, molecules, or ions) and thermodynamic concepts such as enthalpy and entropy.
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a 2.66 mol sample of kr has a volume of 401 ml. how many moles of kr are in a 6.71 l sample at the same temperature and pressure?
The number of moles of kr are in a 6.71 l sample at the same temperature and pressure is 10.94 mol.
What is pressure?
A simpler definition is that pressure means how much something presses on something else. It is expressed in force per unit area. P=F/A.
Therefore, The number of moles of kr are in a 6.71 l sample at the same temperature and pressure is 10.94 mol. A simpler definition is that pressure means how much something presses on something else. It is expressed in force per unit area. P=F/A. Pressure means how much something presses on something else. The number of moles of kr are in a 6.71 l sample at the same temperature.
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What happens in transition phase?
isotopes are atoms of a particular element that contain a different number of neutrons. protons. electrons.
Answer: Neutrons
Explanation:
Isotopes have the same number of protons but have different number of neutrons
the oxidative step of the citric acid cycle that is not linked to the reduction of nad is the reaction catalyzed by:
The oxidative step of the citric acid cycle that is not linked to the reduction of nad is the reaction catalyzed by isocitrate dehydrogenase.
What is citric acid cycle?
C6H8O7 is the chemical formula for citric acid, a weak acid. Both monohydrate and water-free forms are possible for it (anhydrous). Citrus fruits including lemons, oranges, and others typically contain this acid. Tribasic acids are thought to be what it is. It appears as a white crystalline solid, has no smell, and a sour flavour.
What is reduction ?
An increase in the number of electrons linked to an atom or group of atoms is the definition of a reduction, which includes all chemical reactions in the reduction class. To provide the electrons that are absorbed by the reduced molecule, a different substance is oxidised. Identify the oxidation-reduction reaction.
Therefore the oxidative step of the citric acid cycle that is not linked to the reduction of nad is the reaction catalyzed by isocitrate dehydrogenase.
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Cathodic protection of iron involves using another more reactive metal as a sacrificial anode. Classify each of the following metals by whether they would or would not act as a sacrificial anode to iron. Drag each item to the appropriate bin.1. Ag2. Mg3. Cu4. Pb5. Sn6. Zn7. Aua. Will act as sacrificial anode for ironb. Will not act as sacrificial anode for iron
The metals which possess potency towards corrosion are protected with a much more highly active metal called sacrificial anode and thereby combat corrosion.
The reduction potentials of the given elements are shown below,
Fe2++2e−→Fe,E0=−0.44V
Mg2++2e−→Mg,E0=−2.37V
Ag2++2e−→Ag,E0=0.80V
Au3++3e−→Au,E0=1.50V
Pb2++2e−→Pb,E0=−0.13V
Sn2++2e−→Sn,E0=−0.14V
Zn2++2e−→Zn,E0=−0.76V
Cu2++2e−→Cu,E0=0.34V
By analyzing the reduction potentials among the list of given elements, only magnesium and zinc are the only metals that posses a lower reduction potential compared to that of iron. Cathodic protection of iron involves using another more reactive metal as a sacrificial anode. These metals are thus, more reactive than iron making them capable to serve as sacrificial anode. only magnesium and zinc acts as sacrificial anode for iron. The remaining elements Ag, Au, Pb, Sn and Cu will not act as sacrificial anode for iron.
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if 20.1 grams of an aqueous solution of manganese(ii) chloride, mncl2, contains 2.37 grams of manganese(ii) chloride, what is the percentage by mass of manganese(ii) chloride in the solution?
The percentage by mass of manganese(ii) chloride in the solution is 11.79 %.
What is mass percentage?
One method to show the concentration of an element in a compound or component in a combination is as a mass percentage.
Mass percentage
= Mass of solute/Mass of solvent .100
= 2.37/20.1*100
= 11.79 %
∴ Mass percentage of MnCl2 = 11.79 %
Therefore, the percentage by mass of manganese(ii) chloride in the solution is 11.79 %.
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Which of the following will dissociate into the largest number of ions in solution?A) Li2SO4B) KIC) LiC2H3O2D) Na3PO4E) C6H12O6
Na₃PO₄ will dissociate into the largest number of ions in solution.
A dissociation reaction is defined as a reaction where larger molecules dissociates to form new molecules by the use of some energy. The required energy is found in the form of heat or electricity after the reaction. Dissociation reaction is reversible in nature, where a single reactant will break down to form two or more products and vice versa.
The formula for a dissociation reaction is follows as: AB → A + B.
When Na₃PO₄ is dissolved in water, it is broken down into its constituent ions. Constituent ions of Na₃PO₄ are sodium ions and phosphate ions.
Conclusively, The chemical equation for showing the change is given as:
Na₃PO₄(s) → 3Na+(aq) + PO₃⁻⁴(aq)
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What is the most important reason why we throw salt on the ice on driveways?
The most important reason why we throw salt on the ice on drivers because it melts the ice.
In the regions where the climate is very cold, a lot of snow gets accumulated on the driveways.
The result in the blockage of the driveways.
In order to melt the ice present on the driveways we use salt.
When salt is thrown on the ice it releases heat the heat released by the salt is captured by the Ice and it melts to form water. Because of the dissociation of the ions of the salt, the freezing point of the ice on the road decreases to a very low point from zero degrees.
Also using salt is a rather economical method of removing ice the driveways.
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What is a half-life time of a radioactive isotope?
Half-life is the length of time it takes for half of the radioactive atoms of a specific radionuclide to decay.
Radioactive atoms, of which the environment naturally contains a large number, are what cause ionising radiation. A radioactive atom can be found in the forms of a gas, liquid, or solid just like any other sort of atom. An electron cloud surrounds the atom's nucleus, which is made up of protons and neutrons.
Most atoms are stable because neutrons and protons are distributed evenly within them. Nevertheless, some atoms have an unstable proton-neutron ratio. Isotopes are variations of an element that have different neutron counts. Atoms seek stability; therefore, to transition from one stable state to another, they let go of energy from their nucleus in the form of particles or rays.
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a gas is enclosed in a cylinder fitted with a light frictionless piston and maintained at atmospheric pressure. when 254 kcal of heat is added to the gas, the volume is observed to increase slowly from 12.0 m3 to 16.2 m3. a. Calculate the work done by the gas. b. Calculate the change in internal energy of the gas.
The work done by the gas for question A will be 4.2 * 10^5 J.
The change in internal energy of the gas for question B is 6.43 * 10^5 J.
What is work (in gas)?For a gas, it is the product of the pressure P and the volume V during a change of volume. The formula for work done in gas is W (work) = P (pressure) * V (volume)
Now, let's calculate the work done by gas to answer question A.
Work = Pressure * (Volume 2 - Volume 1)
= 1 atm * (16.2 - 12)
= 10^5 Pa * 4.2
= 4.2 * 10^5 J
So the work done by the gas is 4.2 * 10^5 J.
Now, let's find the change in internal energy of the gas.
The heat energy added to the system is
Q = 254kcal
= 254kcal * (4184J / 1 kcal)
= 1.063 * 10^6 J
The change in internal energy of gas is
ΔU = Q (the heat energy added) - W (work done by gas)
= 1.063 * 10^6 J - 4.2*10^5 J
= 6.43 * 10^5 J
Therefore, the change in internal energy of the gas is 6.43 * 10^5 J
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(a) for an ag-90 at% sr alloy at 600c: (i) plot the constitution point on the phase diagram. (ii) identify the phases present and find their compositions in at%. (iii) the temperature is slowly reduced to 500c. will the phase compositions and proportions change? (b) for an ag-30 at% sr alloy at 600c: (i) plot the constitution point on the phase diagram. (ii) identify the phases present, and find their compositions in at%. (iii) will the proportions change if the temperature is reduced to 500c? why is this? (c) the atomic weight of ag is 107.9 and that of sr is 87.6. calculate the compositions of the four intermetallic compounds in the agesr system in weight%. (d) for an al-4 wt% cu alloy: (i) calculate the composition in at% cu (atomic masses of al and cu: 26.98 and 63.54, respectively). (ii) at 550c, identify the phase(s) present, and find its composition (in wt%) and proportion by weight. (iii) repeat for 250c.
(a) At 600 °C, for an Ag-90 at% Sr alloy:
I Draw the phase diagram's constitution point.
(ii) Determine the compositions of the current phases in at%.
(iii) A gradual cooling to 500°C takes place. Will the compositions and ratios of the phases change?
(b) At 600 °C, for an Ag-30 at% Sr alloy:
I Draw the phase diagram's constitution point.
(ii) Recognize the phases and calculate the compositions of each in at%.
(iii) If the temperature is lowered to 500°C, will the proportions change? Why is that so?
(c) The atomic weights of Ag and Sr are 107.9 and 87.6, respectively. Determine the weight percentages of the four intermetallic compounds that make up the Age Sr system.
c) For an Al-4 w t% Copper alloy
I Compute
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draw the electron dot formula for ammonia, nh3. how many nonbonding electron pairs are in an ammonia molecule? question 27 options: a) 1 b) 3 c) 2 d) none of the above e) 6
1 nonbonding electron pairs are in an ammonia molecule.
N has 5 electrons in its valence shell
3 electrons are being used to bond with Hydrogens
2 are left
therefore, there is 1 electron pair
A chemical bond is a lasting enchantment between atoms or ions that allows the formation of molecules and crystals. The bond might also result from the electrostatic pressure between oppositely charged ions as in ionic bonds, or through the sharing of electrons as in covalent bonds.
There are 3 primary varieties of bonding: ionic, covalent, and metallic. Ionic bonding. Definition: An ionic bond is shaped whilst valence electrons are transferred from one atom to the alternative to finish the outer electron shell.
The bond between hydrogen and oxygen atoms to form water is an instance of a covalent bond.
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35. 0 ml of 0. 255 m hno3 is added to 45. 0 ml of 0. 164 m mg(no3)2. What is the concentration of nitrate ion in the final solution?.
The concentration of nitrate ion in the final solution is 0.1116 M.
To find the concentration of nitrate ion in the final solution, you need to know the volume and concentration of the two solutions before they are mixed. The volume of the HNO3 solution is 35.0 mL and the concentration is 0.255 M. The volume of the Mg(NO3)2 solution is 45.0 mL and the concentration is 0.164 M.
To find the concentration of nitrate ion in the final solution, you need to use the formula for dilution of a solution. The formula is:
C1V1 = C2V2
Where C1 is the concentration of the first solution, V1 is the volume of the first solution, C2 is the concentration of the final solution, and V2 is the volume of the final solution.
In this case, you want to find the concentration of the final solution (C2). To do this, you need to rearrange the formula to solve for C2:
C2 = (C1V1)/V2
Plugging in the values from the problem, you get:
C2 = (0.255 M * 35.0 mL) / (35.0 mL + 45.0 mL)
C2 = (8.9275) / (80.0 mL)
C2 = 0.1116 M
Therefore, the concentration of nitrate ion in the final solution is 0.1116 M.
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the density of a certain gaseous fluoride of phosphorus is 3.93 g/l at stp. calculate the molar mass of this fluoride and determine its molecular formula. answer
The molar mass of the compound is 88 g/mol and the formula of the compound is [tex]P_{2} F_{2}[/tex].
What is the molar mass of the gas?We know that the ideal gas equation is the equation that we can be able to obtain any of the parameters that has to do with a gas. In this case, we have the gas that we are told that it is a certain gaseous fluoride of phosphorus and that the density of the gas is about 3.93 g/l
Given that;
MM = dRT/P
MM = molar mass
d = density of the gas
R = gas constant
T = temperature
P = pressure
Then we have to be able to substitute the values as shown;
MM = 3.93 * 0.082 * 273/1
MM = 88 g/mol
The formula of the gas is obtained from;
[PF]n = 88
[31 + 19]n = 88
50n = 88
n = 88/50
n = 2
The molecular formula of the compound is [tex]P_{2} F_{2}[/tex].
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