Answer:
Water - H2O.
Ammonia - NH. ...
Sulfur dioxide - SO. ...
Hydrogen sulfide - H2S.
Ethanol - C2H6O.
Explanation:
Answer:
Water - H2O.
Ammonia - NH. ...
Sulfur dioxide - SO. ...
Hydrogen sulfide - H2S.
Ethanol - C2H6O.
If our eyes could see a slightly wider region of the electromagnetic spectrum, we would see a fifth line in the Balmer series emission spectrum. Calculate the wavelength λ
λ
associated with the fifth line.
Wavelength will be 397 nm.
Balmer series lines are transitions from n > 2 to m = 2
The fifth line is from n = 7 to m = 2
1/λ = R(1/m2 - 1/n2)
= 1.097 x 107 x (1/22 - 1/72)
= 2.519 x 10-6
λ = 1/2.519 x 10-6
= 3.97 x 10-7 m
= 397 nm
The electromagnetic spectrum is the variety of frequencies of electromagnetic radiation and their respective wavelengths and photon energies.
Electromagnetic strength travels in waves and spans a huge spectrum from very long radio waves to very quick gamma rays. The human eye can only detect a small portion of this spectrum and this sprctrum is called visible light. A radio detects a exclusive part of the spectrum, and an x-ray system makes use of but some other portion.
Generally electromagnetic radiation is classed by way of wavelength into:
* Radio wave, * Ultraviolet rays
* Microwave, * X-rays
* Infrared rays * Gamma rays.
* Visible light,
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The small, but important, energy differences between 3s, 3p, and 3d orbitals are due mainly to.
The small, but important, energy differences between 3s, 3p, and 3d orbitals are due mainly to Heisenberg uncertainty principle.
A small but important difference between 3s, 3p, and 3d are due mainly to the Heisenberg uncertainty principle. Their principal quantum number ones rule and the number of weapons that can hold the penetration effect.
An electron in the 3s orbital is more likely to be close to the nucleus than is an electron in the 3p orbital; an electron in the 3p orbital, in turn, has a greater probability of being close to the nucleus than does one in the 3d orbital.
Therefore, degenerate orbitals are those orbitals that have the same energy. As given in the above representation, 2s and 2p orbitals are degenerate; 3s, 3p and 3d orbitals are degenerate, and so on. The degeneracy of the orbitals breaks down in the case of multi-electron systems.
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The following is a DNA nucleotide sequence. Write the sequence of nucleotides that would pair up with this sequence: GCA TCT CCC CGA
Answer: CGT AGA GGG GCT
Explanation:
Cytosine adds up with the G (forgot the name of it) and A connects with the G.
When 0.1 mol of PCls (g) is heated at 78.5 °C in a 1.00 L container, the pressure at
equilibrium is 3.50 x 105 Nm2. Calculate the degree of dissociation of PCIs.
Based on the pressure of the gas in the 1.00 L container, the percentage dissociation of PCl₅ is 60%.
What is the equation of the dissociation of PCl₅?The equation of the dissociation of PCl₅ when heated is given below:
PCl₅ (s) ---> PCl₃ (g) + Cl₂ (g)
Based on the equation of the dissociation of PCl₅, 1 mole of PCl₅ decomposes to give 1 mole of PCl₃ gas and 1 mole of Cl₂ gas.
Hence, 1 mole of PCl₅ dissociates to give 2 moles of gas.
0.1 mole of PCl₅ will dissociate to give 0.1 * 2 moles of gas = 0.2 moles of gas.
At STP, the pressure of 0.2 moles of gas is calculated as follows:
PV = nRT
where;
P is pressure = ?V is volume = 1.00 Ln is the number of moles = 0.2R is molar gas constant = 0.082 L.atm/k.molT is temperature = (273 + 78.5) KP = nRT / V
P = 0.2 * 0.082 * 351.5/ 1
P = 5.76 atm or 5.84 * 10⁵ N/m²
Percentage dissociation of PCl₅ = (3.50 * 10⁵/5.84 * 10⁵) * 100%
Percentage dissociation of PCl₅ = 60%
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HELP ASAP URGENT WILL GIVE BRAINIEST (CORRECT ANSWERS ONLY!!!!!) What mass of H2 forms when 32.25g Al reacts with excess hydrochloric acid? 2AI +6HCI > 2AIC3+3H2
AI: 26.98 g/mol
H2: 2.02 g/mol
[?]g H2
Answer: The correct answer (based on the ratio provided) is the mass of H₂ produced equals 3.51 g of H₂
Explanation:
The equation of the reaction:
2AI + 6HCI → 2AICI₃ + 3H₂
Based on the equation 2 * 27g of Al will produce 3 * 2g of H₂
As a result, 32.25g of Al will produce: 6/55 * 32.25g of H₂
The mass of H₂ produced is therefore 3.51g of H₂
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25.0 L of an ideal gas at 278 K and 4.11 atm are heated to 393 K with
a new pressure of.7.00 atm. What is the new volume (in L)?
The new volume (in L) is 12.2 L
What is Boyle's law Formula and Derivation?According to Boyle's law, a gas's pressure will change whenever its volume changes, even when its quantity and temperature remain constant.Information given:
Volume 1 = 15.0 L
Temperature 1 = 298 K ---------> Temperature 2 = 383 K
Pressure 1 = 3.36 Atm -----------> Pressure 2 = 5.308 Atm
Information they're asking: New Volume 2?
When it comes to ideal gas queries, there are numerous formulae. The combined gas law, which essentially combines all of the gas laws into a single equation, comes to mind as one example. It goes like this: P1V1 / T1 equals P2V2 / T2.We've decided to look for Volume #2, or the volume change that occurs when the temperature rises (as well as the noticeable change in pressure). In order to leave V2 alone on the right side of the equation, the subsequent step is algebraic. When we finish, the equation becomes: P1V1T2 / T1P2 = V2.Substituting it with numbers (Yay! we were provided Kelvins, that's always a plus), we get;
3.36 Atm * 15.0 L * 383 K = V2 = 12.2 L
298 K * 5.308 Atm
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how is polarity designated in a molecule
Due to comparable differences in electronegativity of different elements, partial positive and negative charges developed, hence polarity designated in a molecule.
The terms "polar" and "nonpolar" normally seek advice from covalent bonds. To determine the polarity of a covalent bond the usage of a numerical manner, find the distinction among the electronegativity of the atoms; if the end result is between 0.4 and 1.7, then, generally, the bond is polar covalent.
When the atoms linked by way of a covalent bond are distinct, the bonding electrons are shared, however now not similar. rather, the bonding electrons are extra attracted to at least one atom than the alternative, giving upward thrust to a shift of electron density closer to that atom.
This unequal distribution of electrons is referred to as a polar covalent bond, characterized by means of a partial nice fee on one atom and a partial negative price on the other. The atom that attracts the electrons extra strongly acquires the partial poor fee and vice versa.
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An equilibrium constant of acid-base chemistry that is greater than 1 is recovered from.
A high K value (higher than 1) denotes an equilibrium with more products than reactants, whereas a low K value (less than 1) denotes an equilibrium with more reactants than products.
The equilibrium constant's value reveals whether a reaction is beneficial or unfavorable. Favorable reactions have a Keq value greater than 1, which indicates that energy is liberated throughout the reaction and that the reactants have a higher energy than the products. A spontaneous cell response changes free energy in the negative. The equilibrium constant for these reactions is significantly greater than 1. For these reactions, the value of the standard cell potential is positive.
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What is the freezing point (in degrees Celcius) of 3.27 kg of water if it contains 193.9 g of CaBr₂? The freezing point
depression constant for water is 1.86 °C/m and the molar mass of CaBr₂ is 199.89 g/mol.
The solution's freezing point is 1.65°C.
What is freezing point?The freezing point depression formula is: Adding a solute to the original solvent causes the freezing point to decrease.
ΔT = kf×m×i
Where m is the molality of the solution (Moles CaBr2 -solute- / kg water -solvent), Kf is the freezing point depression constant of the solvent (1.86°C/m), and I is the Van't Hoff factor.
Molality of the solution is:
moles CaBr₂ = 193.9g ₓ (1mol / 199.89g) = 0.97 moles
Molality is:
0.97 moles CaBr₂ / 3.27kg water = 0.296m
For CaBr2, the van't hoff factor indicates how many moles of solute are generated following the dissolution of one mole of solid solute:
CaBr₂(s) → Ca²⁺ + 2Br⁻
1 mole of solid solute yields 3 moles of ions, and the Van't Hoff factor is 3.
ΔT = kf×m×i
ΔT = 1.86°C/m×0.296m×3
ΔT = 1.651
Water loses 1.65°C of its freezing point. Water's 0°C freezing point means that
The solution's freezing point is 1.65°C.
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Calculate the relative molecular mass of CuSo4
Mass of Cu = 63.5
Mass of S = 32
Mass of O = 4
Total molecular mass = 63.5 + 32 + 16 × 4 = 159.5 amu
Which of the following pairs of liquids are likely to be miscible? Check all that apply. Which of the following pairs of liquids are likely to be miscible?Check all that apply. C8H18 and C6H6 Na3PO4 , and H2O H2SO4 and H2O CS2 and CCl4
For miscible : Poler will be miscible in polar.
Non polar will miscible in non polar .
1) C8H18 and C6H6 ( Both are non polar , miscible)
2) H2SO4 and H2O ( Ionic and polar , miscible )
3) CS2 and CCl4 ( Both are non -polar , miscible )
4) Na3PO4 , and H2O ( Salt ionic and polar , miscible )
A liquid is a almost incompressible fluid that conforms to the form of its field however keeps a regular extent impartial of strain. As such, it's miles one of the 4 essential states of remember, and is the only country with a specific quantity but no constant shape.
The atoms in a liquid are loose to transport around, although they can't pass closer collectively or farther apart. This means a liquid flows and modifications shape to fill the space around it.
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Besides nylon, what other product is formed from the reaction of adipoyl chloride and 1,6-diaminohexane?.
Besides nylon, HCl is formed from the reaction of adipoyl chloride and 1,6- diaminohexane , but HCl is the byproduct molecule.
What is formed when adipoyl chloride and 1,6-diaminohexane reacts with each other and what are the by products?Adipoyl chloride is the monomer and hexamethylinediamine is also the monomer which reacts together to form polymer.
The polymer formed is named nylon6,6 which is a co polymer and nylon 6,6 find its use in various other activities of life.
Nylon6,6 is a copolymer since the participation of two monomers , and not a single monomer undergoing decomposition.
Nylon6,6 is formed with an elimination of small molecule of HCl which is considered to be a by product .
It is formed by a condensation reaction and hence HCl is the product formed from the reaction of adipoyl chloride and 1,6- diaminohexane.
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What is the mass of 4.23 × 10^24 molecules of oxygen?
Taking into account the definition of Avogadro's Number and molar mass, the mass of 4.23×10²⁴ molecules of oxygen is 112.37 grams.
Definition of Avogadro's Number
Avogadro's Number is called the number of particles that make up a substance (usually atoms or molecules). This can be found in the amount of one mole of said substance and its value is 6.023×10²³ particles per mole.
Avogadro's number applies to any substance.
Definition of molar massThe molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.
Mass of 4.23×10²⁴ molecules of oxygenYou can apply the following rule of three: if 6.023×10²³ molecules are contained in 1 mole of oxygen, then 4.23×10²⁴ molecules are contained in how many moles of oxygen?
amount of moles of oxygen= (4.23×10²⁴ molecules × 1 mole)÷ 6.023×10²³ atoms
amount of moles of oxygen= 7.023 moles
7.023 moles of oxygen are 4.23×10²⁴ molecules of oxygen.
Being 16 g/mole the molar mass of oxygen, the mass of oxygen in 7.023 moles is calculated as:
mass of oxygen= 7.023 moles×16 g/mole
mass of oxygen= 112.37 grams
Finally, a mass of 112.37 grams are present in 4.23×10²⁴ molecules of oxygen.
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How many shells are there in the Bohr model of a hydrogen atom?
Answer:
Explanation:
When looking at the periodic table, the period (row) corresponds to the number of shells or PEL (principled energy level).
Hydrogen is in the first period and thus has one shell.
Which physical property allows iron to be easily separated from most other materials
The physical property that allows iron to be easily separated from most other materials is magnetism.
Metals that naturally attract magnets are known as ferromagnetic metals. These magnets tend to firmly stick to these metals. For example when you rub a piece of iron along a magnet the north seeking poles of the atoms get lined up in one direction. This causes a force to build up a force and this force creates a magnetic field. This is how a piece of iron becomes a magnet.
To explain the magnetism of iron we can take example iron present in sand, it was seen that the iron filings are attracted to the magnet and the sand is not. This allowed us to separate the iron filings from the sand.
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What is the final volume (in mL) of a solution if you have 17.5 g of NH4NO3 and want a concentration of 1.75 M?
The final volume is 30.62L
Volume is the amount of space occupied by a three-dimensional figure as measured in cubic units
Here given data is
NH₄NO₃ = 17.5 g
Concentration = 1.75 M
We have to calculate final volume solution = ?
So Concentration = mass/volume
Volume = concentration × mass
Volume = 1.75 M × 17.5 g
Volume = 30.62L
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How many joules of energy will be saved by using LED bulb rated at 7.4 watts instead
of a 60 watts incandescent bulb over a 6.5 hour period?
Hint: find the energy use for each of them, then find the difference)
1 kilowatt-hour (kWh) = 3.6 x 106 joules (J)
The energy saved by using an LED bulb is equal to 1.23 ×10⁶ J.
What is power?Power can be described as the amount of energy transferred or converted per unit of time. The S.I. unit of power is one joule per second (J/s) or Watt (W).
Power can be described as a time-based quantity and the rate at which work should be done upon an object. The formula for power can be represented as mentioned below.
Power = Work/time
P = W/t
Given, the power of the first bulb, P = 7.4 W
The bulb gives energy for a time, t = 6.5 hours
Work or energy of the first bulb = 7.4 × 6.5 = 48.1 W.h
Given the power of the second bulb, P = 60 W
The bulb gives energy for a time, t = 6.5 hours
Work or energy of the second bulb = 60 × 6.5 0 = 390 W.h
The difference in the energy = 390 - 48.1 = 341.9 Wh
The energy difference in (Joules) = 341.9 × 3600 = 1.23 ×10⁶ J
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a. 25.0ml of a solution of sodium hydroxide solution required 21.50ml of 0.100 mol sulphuric acid for neutralisation.
Find the concentration of the sodium hydroxide solution in mol/.
H₂SO₄aq+2 NaOH{aq}-----> Na₂SO₄{aq}+2 H₂O{l}
b. Find the volume of 1.2 mol/I hydrochloric acid that reacts with 25.00 cm³ of 1.50 mol /dm³ sodium hydroxide.
HCl{aq}+NaOH{aq} ------>NaCl{aq}+H₂O{l})
c. What volume of 0.040 mol/I calcium hydroxide just neutralises 25.0 ml of 0.100 mol/I nitric acid?
Ca(OH)₂(aq)+2 HNO₃{aq}------> Ca(NO3)₂{aq}+2 H₂O{l}
A. The concentration of the sodium hydroxide solution is 0.172 mol/L
B. The volume of hydrochloric acid that reacts is 31.25 cm³
C. The volume of calcium hydroxide solution is 31.25 mL
A. How do I determine the concentration of sodium hydroxide?
The concentration of sodium hydroxide solution can be obtained by doing the following:
H₂SO₄ + 2NaOH -> Na₂SO₄ + 2H₂O
From the balanced equation above, the following were obtained:
The mole ratio of the acid, H₂SO₄ (nA) = 1The mole ratio of the base, NaOH (nB) = 2From the question, we obtained:
Volume of base, NaOH (Vb) = 25 mLVolume of acid, H₂SO₄ (Va) = 21.5 mL Concentration of acid, H₂SO₄ (Ca) = 0.1 mol/L Concentration of base, NaOH (Cb) =?CaVa / CbVb = nA / nB
(0.1 × 21.5) / (Cb × 25) = 1/2
2.15 / (Cb × 25) = 1/2
Cross multiply
Cb × 25 = 2.15 × 2
Cb × 25 = 4.3
Divide both side by 25
Cb = 4.3 / 25
Cb = 0.172 mol/L
Thus, the concentration of the sodium hydroxide, NaOH solution is 0.172 mol/L
B. How do I determine the volume of the hydrochloric acid?
The volume of the hydrochloric acid can be obtained as follow:
HCl + NaOH -> NaCl + H₂O
From the balanced equation above, the following were obtained:
The mole ratio of the acid, H₂SO₄ (nA) = 1The mole ratio of the base, NaOH (nB) = 1From the question given, we obtained the following:
Concentration of acid, HCl (Ca) = 1.2 mol/LVolume of base, NaOH (Vb) = 25.00 cm³Concentration of base, NaOH (Cb) = 1.50 mol /dm³ = 1.50 mol /LVolume of acid, HCl (Va) =?CaVa / CbVb = nA / nB
(1.2 × Va) / (1.5 × 25) = 1
(1.2 × Va) / 37.5 = 1
Cross multiply
1.2 × Va = 37.5
Divide both side by 1.2
Va = 37.5 / 1.2
Va = 31.25 cm³
Thus, the volume of the hydrochloric acid is 31.25 cm³
C. How do I determine the volume of the calcium hydroxide?
The volume of the calcium hydroxide solution can be obtained as follow:
Ca(OH)₂ + 2HNO₃ -> Ca(NO3)₂ + 2H₂O
The mole of the acid, HNO₃ (nA) = 2The mole of the base, Ca(OH)₂ (nB) = 1Concentration of base, Ca(OH)₂ (Cb) = 0.04 mol/LVolume of acid, HNO₃ (Va) = 25 mL Concentration of acid, HNO₃ (Ca) = 0.1 mol/LVolume of base, Ca(OH)₂ (Vb) =?CaVa / CbVb = nA / nB
(0.1 × 25) / (0.04 × Vb) = 2
2.5 / (0.04 × Vb) = 2
Cross multiply
2 × 0.04 × Vb = 2.5
0.08 × Vb = 2.5
Divide both side by 0.08
Vb = 2.5 / 0.08
Vb = 31.25 mL
Thus, the volume of the calcium hydroxide, Ca(OH)₂ is 31.25 mL
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Hi can someone please help me on 3 and 4 i need help don’t understand a clue lol! thank youuuuu
3. The set of n=6, l=1, [tex]m_{l}[/tex]= +1, [tex]m_{s}[/tex]= +1/2 is valid.
4. The set of n=1, l=1, [tex]m_{l}[/tex]= 0, [tex]m_{s}[/tex]= -1/2 is invalid. The right set is n=1, l=0, [tex]m_{l}[/tex] = 0, [tex]m_{s}[/tex] = +1/2, -1/2
What is quantum number?To define where an electron is located in an associated atom, we utilize a set of precise integers known as quantum numbers. The characteristics of the atomic orbitals and the electrons within them are described by quantum numbers. Four quantum numbers are used to characterize the state of an electron in an atom or ion. Consider them as significant elements in an equation that explains the three-dimensional location of electrons in a specific atom.
Here,
n is principal quantum number,
l is Angular Momentum Quantum Number,
[tex]m_{l}[/tex] is Magnetic Quantum Number,
[tex]m_{s}[/tex] is Spin Quantum Number
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Silver ion can be used to gravimetrically analyze Br- ion. Calculate the gravimetric factor for Br- using silver bromide. Please show how to do so as well.
The gravimetric factor for Br- using silver bromide is 0.425.
What is the gravimetric factor?The gravimetric factor is an expression that is used to convert grams of a compound into grams of a single element.
It is expressed as a ratio of the formula weight (FW) of the substance that is being determined to that of a second substance that is weighed.
Gravimetric factor = formula mass of substance weight / formula mass of substance soughtFor example formula of silver bromide is AgBr and the formula mass of silver bromide is 188 g/mol
Formula mass of bromide ion = 80 g/mol
Gravimetric factor = 80/1188
Gravimetric factor = 0.425
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L
Apply Concepts
6. Look at the illustration. What causes
the phase change of water shown in
the illustration? How do you know?
Chapter 1,1anson 3 Check What are solids, liquids, and gases?
The phase change of water is water particle to evaporate forming water vapor
When water changes state in the water cycle and the total number of water particles remain the same and the changes of state include melting, sublimation, evaporation, freezing, condensation and deposition and heating the water in the first beaker causes the water particles to evaporate and forming water vapor and the particle are far apart and on a molecular level the intermolecular forces between the water molecule are decreasing and the heat is providing enough for the water molecule to overcome these attractive forces and all changes involve either an increase or decrease of intermolecular forces
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Use Hess’s Law to calculate the enthalpy change for the reaction.
C2H4(g) + H2(g) → C2H6(g) ∆Hrxn = ?
Given:
C2H4(g) + 3O2(g) → 2CO2(g) + 2H2O(l) ∆Hrxn 1 = -1410.9kJ
2C2H6(g) + 7O2(g) → 4CO2(g) + 6H2O(l) ∆Hrxn 2 = -3119.4kJ
2H2(g) + O2(g) → 2H2O(l) ∆Hrxn 3 = -571.6kJ
Answer:
∆Hrxn 1 + ∆Hrxn 3 - ∆Hrxn 2 = ?
-1410.9kJ - 571.6kJ + 3119.4kJ = ?
-2801.1kJ
When a piece of sodium metal is dropped into a calorimeter filled with water, hydrogen gas evolves. The temperature of the mixture rises because.
The evolution of hydrogen gas occurs when a piece of sodium metal is dropped into a calorimeter containing water because sodium loses electrons and is oxidized, whereas water is reduced.
Hydrogen gas is created when sodium metal reacts with water, and sodium hydroxide is also created. In this way, one electron is removed from the metal (Na), and an electron is added, turning water into hydrogen gas.
A calorimeter is a device that is used in calorimetry, which is the process of calculating the heat produced by chemical reactions, physical changes, and heat capacity. Among the most popular kinds are titration calorimeters, isothermal micro calorimeters, accelerated rate calorimeters, and differential scanning calorimeters.
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the atomic mass of sulfur is 32.06u. how many atoms are present in exactly 2 mol of sulfur
The number of atoms in 2 moles of the sulfur is 1.204 * 10^24 atoms
How many moles are present?We know that atoms are contained in an element. The number of atoms that are contained in one mole of a substance is given by the Avogadro's number.
Now we know that one mole of sulfur is going to contain 32.06 g of sulfur. This is because this is the mass of one mole of the sulfur atoms that are present. 2 moles of sulfur would contain 64.12 g
Given this fact we can now say that;
32.06 g of sulfur contains 6.02 * 10^23 atoms'
64.12 g of sulfur will contain 64.12 g * 6.02 * 10^23/ 32.06 g
= 1.204 * 10^24 atoms
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What’s an equation showing the beta decay of the Hydrogen-3
Answer:
Explanation:
Thus, negative beta decay results in a daughter nucleus, the proton number (atomic number) of which is one more than its parent but the mass number (total number of neutrons and protons) of which is the same. For example, hydrogen-3 (atomic number 1, mass number 3) decays to helium-3 (atomic number 2, mass number 3)
Which statement is true about synthesis reactions?
O They must have one or more reactants.
O They must have more than one product.
They must have two or more reactants
They must have two or more products.
A synthesis reaction has to do with one that they must have two or more reactants.
What is a synthesis reaction?In a synthesis reaction we would have the combination of two or more reactants but we are going to have a single product. The reactants that we have would somehow just combine and give us the product that we are looking for.
Thus, the idea of the synthesis reaction is that there would be a joining of the reactants. This already means that we must have more than one of the reactants so that we can have the species that would be joined in the reaction.
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Please and thank you
Answer:
A
Explanation:
How many moles of O2 were produced in a decomposition reaction of H2O2 if the pressure was 0.978 atm, the temperature was 27C and the volume of O2 gas collected was 0.082L
The number of mole of O₂ produced from the decomposition of H₂O₂ is 0.0033 mole
How to determine the number of mole of O₂ producedWe'll begin by obtaining the mole of H₂O₂ that decomposed. This is obatined as follow:
Pressure (P) = 0.978 atmTemperature (T) = 27 °C = 27 + 273 = 300 KVolume (V) = 0.082 LGas constant (R) = 0.0821 atm.L/Kmol Mole of H₂O₂ (n) =?PV = nRT
Divide both sides by RT
n = PV / RT
n = (0.978 × 0.082) / (0.0821 × 300)
n = 0.0033 mole
Finally, we shall determine the number of mole of O₂ produced. This is illustrated below
H₂O₂ -> H₂ + O₂
From the balanced equation above,
1 mole of H₂O₂ decomposed to produce 1 moles of O₂
Therefore,
0.0033 mole of H₂O₂ will also decompose to produce = 0.0033 mole of O₂
Thus, number of mole of O₂ produced from the reaction is 0.0033 mole
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if the dissolution of borax in water is spontaneous, is the change in enthalpy positive or negative - or are both signs possible?
Specific heat capacity of a substance is the amount of heat required to raise the temperature by one degree Celsius of one gram of a substance. Therefore, the change in enthalpy will be negative.
What is Enthalpy?Enthalpy term is basically used in thermodynamics to show the overall energy that a matter have. Mathematically, Enthalpy is directly proportional to specific heat capacity of a substances.
Mathematically,
Enthalpy=mass of solution× specific heat capacity of solution ×Change in temperature.
Any reaction which is spontaneous, then the enthalpy related to this type of reaction is always negative that is reaction is always exothermic.
Therefore, the change in enthalpy will be negative.
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Scientists have changed the model of the atom as they have gathered new evidence. One of the atomic models is shown below.
A large black cross in a purple circle with a black line around the purple, with 10 small green balls dispersed within the purple circle.
What experimental evidence led to the development of this atomic model
The experimental evidence that led to the development of this atomic model is that atom is divisible and having subatomic particles such as proton, electron and neutron.
What are experimental evidence?Experimental evidence is said to be comprised of observations generated under controlled conditions rather than through other empirical research methods. The experimental evidence makes it possible for scientist to draw causal inferences about a phenomenon under study.
From the gold foil experiment, some of the positive particles aimed at a gold foil seemed to bounce back which gives information to the scientists that some heavy particles present in the center of the atom which bounce back the positive particles.
Learn more about experimental evidence at: https://brainly.com/question/13774487
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