Answers
Related Questions
is H2 a covalent bond
Answers
yes
H requires 1 electron to achieve duplet/2 stability
The H atom must share 1 electron to form a single covalent bond.
The Liquified Petroleum Gas (LPG) has the composition of 60% Propane (C 3
H 8
) and 40% Butane (C 4
H 10
) by volume: (a) Find the wet volumetric and gravimetric analysis of the products of combustion when the equivalence ratio (Φ)=1.0. (b) What is the stoichiometric air to fuel ratio for the LPG.
Answers
The balanced combustion reaction for propane can be represented as:
C₃H₈ + (5/2)O₂ → 3CO₂ + 4H₂O
And the balanced combustion reaction for butane can be represented as:
C₄H₁₀ + (6.5)O₂ → 4CO₂ + 5H₂O
Since LPG is composed of 60% propane and 40% butane by volume, we can calculate the wet volumetric and gravimetric analysis based on these proportions.
Wet volumetric analysis:
For the wet volumetric analysis, we consider the volume of the products of combustion relative to the volume of the LPG consumed.
Propane (C₃H₈):
The stoichiometric coefficient of propane in the combustion reaction is 3. Therefore, for every mole of propane burned, we will have 3 moles of CO₂ and 4 moles of H₂O formed.
Butane (C₄H₁₀):
The stoichiometric coefficient of butane in the combustion reaction is 4. Therefore, for every mole of butane burned, we will have 4 moles of CO₂ and 5 moles of H₂O formed.
Considering the initial composition of 60% propane and 40% butane by volume, we can calculate the volumetric composition of the products of combustion:
Volumetric composition of CO₂:
(0.6 * 3) + (0.4 * 4) = 3.6
Volumetric composition of H₂O:
(0.6 * 4) + (0.4 * 5) = 4.6
Therefore, the wet volumetric analysis of the products of combustion is 3.6 parts CO₂ to 4.6 parts H₂O.
Wet gravimetric analysis:
For the wet gravimetric analysis, we consider the mass of the products of combustion relative to the mass of the LPG consumed.
Using the molar masses of the compounds involved in the combustion reaction:
Molar mass of CO₂ = 44 g/mol
Molar mass of H₂O = 18 g/mol
Gravimetric composition of CO₂:
(0.6 * 3 * 44 g/mol) + (0.4 * 4 * 44 g/mol) = 158.4 g
Gravimetric composition of H₂O:
(0.6 * 4 * 18 g/mol) + (0.4 * 5 * 18 g/mol) = 74.4 g
Therefore, the wet gravimetric analysis of the products of combustion is 158.4 grams CO₂ to 74.4 grams H₂O.
(b) The stoichiometric air to fuel ratio for LPG can be determined based on the balanced combustion equations for propane and butane.
For propane (C₃H₈):
C₃H₈ + (5/2)O₂ → 3CO₂ + 4H₂O
The stoichiometric coefficient for propane is 1, which means we need 5/2 moles of O₂ for every mole of propane.
For butane (C₄H₁₀):
C₄H₁₀ + (6.5)O₂ → 4CO₂ + 5H₂O
a sample of xenon gas at a pressure of 0.537 atm and a temperature of 238oc, occupies a volume of 419 ml. if the gas is heated at constant pressure until its volume is 555 ml, calculate the temperature of the gas sample
Answers
The final liquid volume, which is 500 ml, is equal to the final bitey initial, which is 300 Kelvin. By 200 million L, they were behind. So, after the problem is solved, the temperature will be 750 Kelvin, which can be converted to degrees Celsius. so that we can get 7°C twice
By substituting, we get one atmosphere's initial volume of time, which is 225 ml, divided by the atmosphere's final volume, which is 100 M. L. They number four. 0.25 atmospheres of final pressure are present.
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A helium balloon with an internal pressure of 1.00 atm and a volume of 4.50 L at 20.0˚C is released. What volume will the balloon occupy at an altitude where the pressure is 0.600 atm and the temperature is –20.0˚C?
GAS LAW:
Given:
Unknown:
Formula:
Solution:
FInal Answer: V2 =
Answers
The Gas law is COMBINED GAS LAW
GIVEN :
P1=1.00 atmp
V1=3.50 lit
T1 = 20.0°C = 293K
P2=0.600 atmp
T2=-20.0°C=253K
Now,
Formula =>
P1V1/T1 =P2V2/T2
=> V2 = (P1/P2)(T2/T1)(V1)
=> V2 = (1.00/0.60)(253/293)(3.50)
=>V2 = 5.01403 L
=> V2 = 5L (approx).
PLEASE HELP ITS DUE TMRW!! also show your work too please!
Answers
1. HCl is a strong acid, so the concentration [H3O⁺] in 0.000010 M HCI is 0.000010 M. 2. The [OH-] in 0.000010 M HCI is 1 ×10⁻¹⁰ M.
1. The concentration of H3O⁺ ions is identical to the original concentration of HCl since HCl is a strong acid that totally dissociates in water.
Kw = [H3O⁺][OH-] = 1.0 x 10⁻¹⁴
To Find the [H3O+] in 0.000010 M HCl:
[H3O⁺] = 0.000010 M
2. 1 ×10⁻¹⁰ M
3. 0.001 M
4. 0.0010 M
5. 1 ×10⁻¹¹ M
6. 10⁻⁶ M
7. 1 ×10⁻¹¹ M
8. 0.00005 M
9. 0.00020 M
10.0.00256 M
11. 1.25 × 10⁻¹³ M
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How can we see all four colors from a hydrogen gas dischrarge tube simutaneously?
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There are thousands of hydrogen atoms so together they can let off or group up to form all four colors.
Hydrogen is a chemical element with the symbol H and atomic number 1. Hydrogen is the lightest element. Under standard conditions, hydrogen is a diatomic molecular gas of the formula H2. It is colorless, odorless, tasteless, non-toxic, and highly flammable.
Hydrogen is an energy carrier that can be used to store, transfer, and deliver energy generated from other energy sources. Hydrogen fuel can be produced today by several processes. The most commonly used methods today are natural gas reforming (a thermal process) and electrolysis. It is found in the Sun and most stars, and the planet Jupiter is composed primarily of hydrogen. On Earth, hydrogen is most abundant as water. As a gas in the atmosphere, it is present in trace amounts, less than 1 ppm by volume.
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Density is the ratio of a substance ___ to its volume
A. Force B. Mass C. Thickness D. Weight
Answers
Answer:
Mass
Explanation:
How can a solution become saturated?
O more solution is added
O more solvent is added
O more solute is added
o the concentration is decreased
Answers
Answer:
it think it is more solute added
Solutions can be saturated by allowing more solute to be dissolved. Thus by adding more solute to the solution it becomes easily saturated. Thus, option C is correct.
What is a saturated solution ?A solution is made of a solvent and a solute. The solute be a solid component which dissolves in the solvent to form a homogenous or heterogenous solution.
The solvent have a capacity to dissolve the solute upto a limit and this point where the solvent dissolves the maximum solute added is called saturation point. And the solution in which maximum solute is dissolved and remaining precipitates under is called saturated solution.
Beyond the saturation point, no further addition of solute make the solvent dissolving. Therefore, the solute reaches its maximum solubility. Solubility of a solute is the fraction of its concentration which dissolves in a solvent.
By adding more solute the solvent tries to dissolves some more solutes and remaining solute will appear as a precipitate under the solution. Therefore, option C is correct.
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someone help this is confusing lol. ILL BRIANLIST!
Answers
Answer:
A spider
B termite
C 2nd
D grassy environment
E the clams will grow in numbers
Explanation:
Answer:a- spider b-lizard c- the second one (II) d- you can literally find it in your backyard or a field e- the number of clams will increase
Explanation:
Benzene can be nitrated with a mixture of nitric and sulfuric acids. Draw the 3-atom electrophile in the reaction. Include any formal charges.
Answers
When benzene is nitrated with a mixture of nitric and sulfuric acids, the electrophile that attacks the benzene ring is a nitronium ion, which has the chemical formula NO2+. This electrophile is generated in situ from the reaction between nitric acid and sulfuric acid, as shown below:
HNO3 + H2SO4 → NO2+ + HSO4- + H2O
The nitronium ion has a formal positive charge on the nitrogen atom (+1) and a formal negative charge on one of the oxygen atoms (-1), giving it an overall formal charge of 0. The three atoms that make up the nitronium ion are nitrogen (N), oxygen (O), and oxygen (O), arranged in a linear configuration. The nitrogen atom is the electrophilic center, as it is the site of positive charge and the atom that attacks the benzene ring in the nitration reaction.
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Which statement about planetary orbits is correct?
O A. The planets travel in perfect circles around the sun.
O B. The planets travel in perfect circles around Earth.
O C. The planets travel in ellipses around the sun.
OD. The planets travel in ellipses around the moon.
Answers
Answer: C planets dont travel in perfect circles and they do not orbit earth they orbit the sun and they ellipse around the sun. this is the correct answer do not lsiten to the other person
Explanation:
The statement which is correct about planetary orbits is the planets travel in ellipses around the sun.
What are orbits?Orbits is the path of the motion, in which planets do revolutionary motion in a particular sequence.
In the solar system, sun is present at the center and all the planets do revolution around the sun in their orbits which are ellipse in their shape. Elliptical shape of the orbits is due the large distance of planets from the sun which reduces the speed due to less gravitational force of sun on that object.
Hence, option (C) is correct i.e. The planets travel in ellipses around the sun.
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Approximately how long does it take for the moon's phases to change from a NEW moon to a FULL moon?
1 week
3 weeks
2 weeks
4 weeks
Answers
Answer:
4 weeks
Explanation:
It takes 4 weeks for the cyclle to be happening again
What is the Vernal Equinox?
the day where the daylight and night are equal in the Fall
the day where the daylight and night are equal in the Spring
shortest day of the year
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Answer:
the day where the daylight and night are equal in the Spring
Why does the earth rotate
A:because it’s formed from cold gases collapsing due to gravity
B: Because the matter in the nebula that formed
C:Because the earth form is more than 99% of the mass of the Solar system
D; Because the hydrogen Adams inside the nebular fuse to form helium
Answers
Answer:
A
Explanation:
Your answer would be A because Earth is formed from cold gases collapsing due to gravity. The Solar System was formed when a huge amount of dust and gas began to collapse under its own gravity, and as the cloud collapse it started to spin causing the material within the cloud to gather into a swirl and then formed into planets and as the planets are formed they kept this spinning motion.
Carbon cycle – What are the main reservoirs
of the carbon cycle? Where do the inorganic and organic carbon
cycles interact? What are the major differences and similarities
between the inorganic and organic carbon?
Answers
The main reservoirs of the carbon cycle are the atmosphere, oceans, land (including vegetation and soils), and fossil fuels. In these reservoirs, carbon exists in both inorganic and organic forms.
The inorganic carbon cycle involves the exchange of carbon dioxide (CO2) between the atmosphere and oceans through processes like photosynthesis and respiration.
Organic carbon, on the other hand, is found in living organisms, dead organic matter, and soil organic matter. It is cycled through processes such as decomposition and consumption by organisms. The interactions between the inorganic and organic carbon cycles occur primarily in the biosphere, where photosynthesis converts inorganic carbon into organic carbon compounds. While inorganic carbon is primarily in the form of CO2, organic carbon is present in complex organic molecules. Both forms of carbon play crucial roles in energy transfer, nutrient cycling, and climate regulation.
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If a 200 g piece of aluminum has a density of 5.0 g/cm^3. what is its volume?
Answers
Answer:
Volume=mass in g /density
Answer: 40cm^3 or 40ml
Explanation:
\(Density=\frac{mass}{volume}\)
so 5=200/V
V=200/5
V=40cm^3
If you are correct you get a brainless
(07.01 MC)
As a part of the life cycle of plants, the plant must begin with an embryo. What statement best describes where the embryo can be found in flowering and non-flowering plants? (2 points)
Answers
(don’t count on my answer but I think it might be this one and I apologize if you get it wrong)
a classification for matter that always has the same composition
Answers
Answer:
Explanation:
Matter that always has exactly the same composition is classified as a pure substance. Every sample of a given substance has the same properties because a substance has a fixed, uniform composition.
In dimensional analysis you should always have the same units adjacent to each other (top left to bottom right)
O True
O False
Answers
Answer:
False
Explanation:
Determine the coordination number for each structure.
a. Gold
b. Ruthenium
c. Chromium
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7. From the following enthalpy changes,
Xe (g) + F2 (g) → XeF2 (s)
Xe (g) + 2F2 (g) → XeF4 (s)
calculate the value of AH° for the reaction XeF2 (s) + F2 (g) →→→ XeF4 (s).
AH° = -123 kJ
ΔΗ° = -262 kJ
Answers
In the standard enthalpy of formation, all the substances are represented in their standard states. The enthalpy of formation for the reaction is -139 kJ.
What is enthalpy of formation?The standard enthalpy of formation of a compound is defined as the enthalpy change accompanying the formation of one mole of the compound from its constituent elements.
In order to calculate the enthalpy of formation of XeF₄, we want XeF₂ on the reactant side. For this reverse the equation (1).
XeF₂ → Xe (g) + F₂ (g) ΔH = 123 J
By reversing, the sign of ΔH change as well.
Xe (g) and F₂ (g) of equation (1) cancels out with Xe and one of the F₂ of equation (2).
Now left is XeF₂ (s) + F₂ (g) → XeF₄ (s)
ΔH = 123 - 262 = -139 kJ
Thus the value of ΔH⁰ is -139 kJ.
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How do the atomic number and the mass number of an element
change after beta decay?
A. Atomic number stays the
same; mass number
increases by 1.
C. Atomic number increases by
1; mass number stays the
same.
B. Atomic number stays the
same; mass number
decreases by 1.
D. Atomic number decreases by
1; mass number stays the
same.
Answers
Answer:
A.
Explanation:
4) The substance CuCl₂ 2H₂O is an ionic solid with 2 water molecules trapped in
the crystal for every molecule of CuCl₂. What is the molar mass for this
compound?
O63.55 g/mol
O134.55 g/mol
152.57 g/mol
O170.48 g/mol
O269.10 g/mol
305.13 g/mol
Answers
The molar mass of the compound: CuCl₂·2H₂O = (1 × 63.55) + (2 × 35.45) + (2 × 2 × 1.01) + (2 × 16.00) CuCl₂·2H₂O = 63.55 + 70.90 + 4.04 + 32.00 CuCl₂·2H₂O = 170.49 g/mol So, the molar mass of the compound CuCl₂·2H₂O is approximately 170.48 g/mol (as per the given options).
To determine the molar mass of CuCl₂ 2H₂O, we need to calculate the total mass of all the molecules present in one mole of the compound. The molecular weight of CuCl₂ is 134.45 g/mol (63.55 g/mol for Cu and 70.90 g/mol for Cl₂). Since there are two water molecules in the compound, we need to add their molecular weight as well, which is 2(18.015 g/mol) = 36.03 g/mol. Therefore, the molar mass of CuCl₂ 2H₂O is:
molar mass = 134.45 g/mol + 36.03 g/mol = 170.48 g/mol
Thus, option D is the correct answer.
In summary, to calculate the molar mass of a compound, we need to add up the masses of all the molecules present in one mole of the compound, which is expressed in grams per mole. Knowing the molar mass of a compound is useful for many purposes, including determining the amount of a substance needed for a chemical reaction, calculating the concentration of a solution, and converting between the mass and moles of a substance.
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The volume of a certain gas is 29.3 liters at STP. what would the volume of the same gas at 1.39 atmospheres and -23.0℃?
A. 23 L
B. 37.3 L
C. 19.3 L
D. 22.4 L
Answers
Option C) 19.3L is the correct answer.
Hence, the final volume of the gas at the standard atmospheres and temperature is 19.3L.
Given the data in the question;
Initial volume of gas; \(V_1 = 29.3L\)At Standard temperature and pressure( STP)
Initial temperature; \(T_1 = 273.15K\)Initial pressure; \(P_1 = 1.00atm\)Then
Final pressure; \(P_2 = 1.39atm\)Final temperature; \(T_2 = -23.0^0C = 250.15K\)Final Volume; \(V_2 = \ ?\)
Combined gas lawCombined gas law combines both Boyle's Law, Charles's Law, and Gay-Lussac's Law. It states that the ratio of the product of volume and pressure and the absolute temperature of a gas is equal to a constant.
It is expressed as;
\(\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}\)
To determine the new volume of the gas, we substitute our values into the expression above.
\(\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}\\\\P_1V_1T_2 = P_2V_2T_1\\\\1.00atm * 29.3L * 250.15K = 1.39atm * V_2 * 273.15K\\\\7329.395atm.L.K = 379.6785atm.K * V_2\\\\V_2 = \frac{7329.395atm.L.K}{379.6785atm.K} \\\\V_2 = 19.3L\)
Option C) 19.3L is the correct answer.
Hence, the final volume of the gas at the standard atmospheres and temperature is
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In a solution of brine (salt water), what is the salt? A. a solute B. a solvent C. a solution D. a reactant E. a product
Answers
Answer:
solute
Explanation:
solvent is the water solution is the whole mixture product is the solution
A. a solute
B. a solvent
C. a solution
D. a reactant
E. a product
PLLLZZZZZZZZZZZZZZZ HELPPPPPP MEEEEEEEEEEEE THHHXXX
Answers
what are the two major components of the climate
Answers
Answer:
Water and carbon. They are important for climate, and they are important for life.
Carbon 14 half life if 5700 years. A newly discovered fossilized organism is estimated to have initially started with 7.1x10-3 mg of Carbon-14. Once analyzed scientists find it only has 5.1x10-7 mg of Carbon 14 in its system. How old is the fossil?
Answers
The given problem can be solved with the help of the carbon dating formula.
The formula for carbon dating is used to determine the age of a fossil.
It is represented as:
N f = No (1/2) t/t1/2
The half-life of carbon-14 is given as 5700 years, which means that after 5700 years, half of the radioactive isotope will be gone.
The remaining half will take another 5700 years to decay, leaving behind only 1/4th of the original radioactive isotope.
In the given problem, the amount of carbon-14 remaining is 5.1x10-7 mg, and the initial amount of carbon-14 was 7.1x10-3 mg.
We can now substitute these values in the above formula.
N f/No = 5.1x10-7 / 7.1x10-3 = (1/2) t/5700Let's solve the equation for t by cross-multiplying.
7.1x10-3 x 1/2 x t1/2 / 5700 = 5.1x10-7t1/2 = 5700 x log (7.1x10-3 / 5.1x10-7) t1/2 = 33,153.77 years
Remember to show the appropriate units for the values given in the problem,
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in part I and II of the lab, what happened to the electrons of each element to produce the different colors of light?
Answers
In part I and II of the lab, the different colors of light produced by each element were due to the electrons transitioning between energy levels.
When an element is heated or excited, its electrons absorb energy and jump to a higher energy level.
As the excited electrons return to their original lower energy levels, they release the absorbed energy as photons.
The energy of these photons corresponds to specific wavelengths of light, which determine the color we observe.
Each element has a unique electron configuration, causing distinct energy level transitions and producing a characteristic spectrum of colors.
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Please answer BOTH questions! Many thanks.
Answers
The Born -Haber cycle is used to find out the lattice energy and formation enthalpy of a reaction from its individual steps. The total energy of the cycle is zero.
What is Hess law ?According to Hess law, we can split a reaction into several steps. each steps involves the phase transitions, ionization of constituent elements.
The energy required form a solid compound from its constituent elements in gaseous state is called the lattice energy of the compound. Here the formation of KBr from gaseous K and Br is given. Thus the enthalpy change is called lattice energy.
The lattice energy plus the formation energy is called the total energy in the reaction. Where, the enthalpy change of the cycle is zero. The Born -Haber cycle of the given reaction include first reaction with the phase transition of each elements and their ionization.
The ionized atoms combine together to form the product, which is written as the overall reaction in the top.
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