The distinguishing characteristics of comets, meteors, and asteroids are its composition.
What are the characteristics of comets, meteors and asteroids?Asteroids are the fragments of rock that were left over from the creation of the solar system, Meteors are the rocks that enter the atmosphere of the Earth from space while on the other hand, Comets are the remnants of the formation of the solar system that are made of dust, rocks, and ice. All these materials i.e. comets, meteors and asteroids are different from one another due to its structure and chemical composition.
So we can conclude that the distinguishing characteristics of comets, meteors, and asteroids are its composition.
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Find the empirical formula for a compound consisting of 63% MN and 37% O.
Answer:
Mn₁O₂
Explanation:
To find the empirical formula, you need to (1) determine how many grams of each element are within the compound, then (2) convert grams to moles (via the atomic masses of each element), and then (3) determine the mole-to-mole ratio of each element.
(Step 1)
Because the percents add to equal 100%, we can say that each percent is the mass of each element.
63% Mn ----> 63 grams Mn
37% O ----> 37 grams O
(Step 2)
We need to convert each mass to moles using the atomic masses. The atomic masses are a ratio comparing the mass of each element per every 1 mole.
Atomic Mass (Mn): 54.983 g/mol
Atomic Mass (O): 15.998 g/mol
63 grams Mn 1 mole
---------------------- x ------------------------- = 1.15 moles Mn
54.983 grams
37 grams O 1 mole
-------------------- x ------------------------ = 2.31 moles O
15.998 grams
(Step 3)
You can find the mole-to-mole ratio of each element in the compound by dividing the calculated mole values by the smallest mole value. In this case, since 1.15 moles was the smallest value calculated, it should be the divisor. The resulting amounts are the subscripts within the empirical formula.
1.15 moles Mn / 1.15 moles = 1 moles Mn
2.31 moles O / 1.15 moles = 2 moles O
Ratio of MnO = 1:2
This make the empirical formula: Mn₁O₂
Which energy profile best shows that the formation of NO2 requires 33.1
kJ/mol?
The energy profile representing the reaction of the formation of NO2 is energy profile B; option D.
What is an energy profile diagram?An energy profile diagram is a diagram which illustrates in the form of a graph the energy changes that occur as reactant molecules react to form products.
An energy profile has energy of the molecules plotted on the y-axis and the reaction pathway or the reaction progress on the x-axis.
The shape of an energy profile depends on whether the reaction is an endothermic or exothermic reaction.
An exothermic reaction will have the energy of reactants higher than that of products, whereas an endothermic reaction will have the energy of products higher than the reactants.
The formation of NO2 is an endothermic reaction which requires 33.1kJ/mol of energy to complete.
Therefore, the energy profile representing the reaction is energy profile B.
In conclusion, an energy profile diagram shows energy changes that occur in a reaction graphically.
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why is fruit cake a heterogeneous mixture ??
Where is information found concerning acceptable species substitutions for wood materials used in aircraft repair
The list of acceptable species of wood materials used in aircraft structure is found in Table 1-1 on Page 1-2 of AC 43.13-1B.
Which types of wood are used in aircraft repair?Construction of Aircraft with Wood There are four types of wood that are frequently used in the manufacture of aircraft. These include Douglas fir, Sitka spruce, birch, and ash. Additionally, gabon, mahogany, balsa, and pine serve specific purposes. Softwood Sitka Spruce grows in both Canada and the United States of America.
What wood is used for aircraft?Contrary to popular opinion, Howard Hughes' Spruce Goose was made of birch, not spruce, despite the fact that Sitka spruce is the most often used wood in airplanes. Spruce is regarded as the best natural material for building aircraft because it has one of the highest strengths-to-weight ratios.
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You can practice converting between the mass of a solution and mass of solute when the mass percent concentration of a solution is known. The concentration of the KCN solution given in Part A corresponds to a mass percent of 0.208 % . What mass of a 0.208 % KCN solution contains 914 mg of KCN ? Express the mass to three significant figures and include the appropriate units.
The mass of the solution will be 4,394 mg
Mass percentThe mass percent of a component in a solution can be derived as follows:
Mass percent = mass of component/total mass of solution x 100%
In this case, the mass percent of KCN in the solution is 0.208 and the mass of KCN is 914 mg.
The mass of the 0.208% KCN solution will be:
914/0.208 = 4,394 mg
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It is always feasible that a substance will dissolve in water when:
A. Enthalpy is negative and entropy is positive.
B. Enthalpy is negative and entropy is negative.
C. Enthalpy is positive and entropy is positive.
HELP PLEASE 15 points
The free energy is always negative and the dissolution is feasible when enthalpy is negative and entropy is positive. Option A
What is dissolution of a substance in water?Water is known as the universal solvent. Water is a polar substance hence it is often used to dissolve polar substances. It has a dipole and being that there is a high degree of electronegativity difference between the oxygen and the hydrogen atoms in water, it is feasible that the degree of hydrogen bonding between the two is high.
We know that dissolution is favored when there will be an increase in entropy as a result of that, that is; if more particles will appear. Now we know that ΔG = ΔH - TΔS.
Given the equation above, it then follows that the free energy is always negative and the dissolution is feasible when enthalpy is negative and entropy is positive. Option A
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When a hydrogen atom is part of a molecular structure, it is always a ___________ atom.
Answer:
terminal
Explanation:
When a hydrogen atom is part of a molecular structure, it is always a terminal atom.
Which diagram is the correct electron dot diagram for magnesium?
A.
A symbol of magnesium M g has four dots representing four free electrons.
B.
A symbol of magnesium M g has three dots representing three free electrons.
C.
A symbol of magnesium M g has one dot representing one free electron.
D.
A symbol of magnesium M g has two dots representing two free electrons.
A symbol of magnesium, Mg, with two dots representing two free electrons. The correct option is D.
Electron dot diagramMagnesium is represented by Mg.
Magnesium has an atomic number of 12. Thus the electron configuration will be 2,8,2.
This means that there are two valence electrons in every Mg atom.
Therefore, the electron do diagram would be the symbol of the element with two dots representing the two valence electrons.
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Answer:
Two dotted M
Explanation:
A sample of gas has a temperature of 25 oc and a volume of 122 ml. if the volume is decreased to 50 ml, what is the new temperature?
Answer:
10.2 °C
Explanation:
If all other variables are held constant, you can find the new temperature using the Charles' Law equation. The equation looks like this:
V₁ / T₁ = V₂ / T₂
In this equation, "V₁" and "T₁" represent the initial volume and temperature. "V₂" and "T₂" represent the final volume and temperature. You can find the new temperature by plugging the given values into the equation and simplifying.
V₁ = 122 mL V₂ = 50 mL
T₁ = 25 °C T₂ = ? °C
V₁ / T₁ = V₂ / T₂ <----- Charles' Law equation
122 mL / 25 °C = 50 mL / T₂ <----- Insert values
4.88 = 50 mL / T₂ <----- Divide 25 from 122
4.88 x T₂ = 50 mL <----- Multiply both sides by T₂
T₂ = 10.2 °C <----- Divide both sides by 4.88
Calculate the Kc for the following reaction if an initial reaction mixture of 0.500 mole of CO and 1.500 mole of H2 in a 5.00 liter container forms an equilibrium mixture containing 0.198 mole of H2O and corresponding amounts of CO, H2, and CH4. CO (g) 3 H2 (g) rightwards harpoon over leftwards harpoon CH4 (g) H2O (g)
Answer:
can you be more clear with your question :
Chlorine gas is applied at a rate of 40 pounds per day to a well operating at 1250 gpm. What is the chlorine dosage for this well, expressed in parts per million
2.7 is the chlorine dosage for this well, expressed in parts per million.
Unlike municipal water, well water does not go through a water treatment facility. That implies that it could be contaminated with poisons like lead, coliform bacteria, volatile chemical compounds, and others. chlorination in well water is done to fulfill the role that chlorine plays in municipal sources' water disinfection processes.
It is advised to start with a chlorine concentration of 50 to 100 parts per million (ppm).
Bacterial pollutants are eliminated from well water, well casings, holding tanks, and the entire water delivery system via shock chlorination. To shock chlorinate, a well driller with a license is trained.
Algae have been linked to green water, and they may thrive in both surface water and groundwater wells even in the absence of sunshine. Algae can color the water in both the pre-and post-decomposition stages with a variety of hues, including green, brown, and reddish.
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__Pb(NO3)2 + __NaCI = __NaNO3 + __PbCI2
Answer:
Pb(NO3)2 + 2NaCl = 2NaNO3 + PbCl2
A sample of hydrogen gas collected at a pressure of 0.923 atm and a
temperature of 17.0 °C is found to occupy a volume of 29.6 liters. How many
moles of H₂ gas are in the sample?
mol
Answer:
1.15 moles H₂
Explanation:
To find the moles of H₂ gas, you need to use the Ideal Gas Law equation. The equation looks like this:
PV = nRT
In this equation,
-----> P = pressure (atm)
-----> V = volume (L)
-----> n = moles
-----> R = Ideal Gas Constant (0.08206 L*atm/mol*K)
-----> T = temperature (K)
Before you can plug the given values into the equation and simplify, you need to convert Celsius to Kelvin.
P = 0.923 atm R = 0.08206 L*atm/mol*K
V = 29.6 L T = 17.0 °C + 273.15 = 290.15 K
n = ? moles
PV = nRT
(0.923 atm)(29.6 L) = n(0.08206 L*atm/mol*K)(290.15 K)
27.3208 = n(23.809709)
1.15 = n
Including the conversion of pyruvate to acetyl coa, how many nadh, fadh2, atp, and gtp molecules are produced during the krebs cycle?
3 NADH + [tex]1FADH_{2}[/tex] + 1GTP (=ATP) is used during Krebs Cycle in every acetyl CoA
The Krebs cycle is also called citric acid cycle.The Krebs cycle is used for conversion pyruvate to acetyl CoA.The sequence of reaction in living organism in which oxidation of acetic acid or acetyl equivalent provides energy for storage in phosphate bonds.The pyruvate is important chemical compound in the biochemistry.The pyruvate is primary used as transporter of carbon atoms into the mitochondria and do complete oxidation of this carbon atoms into carbon dioxide.
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10.0 g of nickel is cooled to 2.0 °C and
placed into a sample of warm water.
The final temperature of the water and
nickel was 63.4 °C. How much energy
is absorbed by the nickel?
J
CNi = 0.120 g. C
9Ni = [?] J
Answer:
73.68 J
Explanation:
To find the energy absorbed by nickel, you need to use the following equation:
Q = mcΔT
In this equation,
-----> Q = energy (J)
-----> m = mass (g)
-----> c = specific heat (J/g°C)
-----> ΔT = change in temperature
The change in temperature is found by subtracting the initial temperature from the final temperature. You can plug the given values into the equation and simplify to find the energy absorbed.
m = 10.0 g
c = 0.120 J/g°C
ΔT = 63.4 °C - 2.0 °C = 61.4 °C
Q = mcΔT
Q = (10.0 g)(0.120 J/g°C)(61.4 °C)
Q = 73.68 J
Hat product forms at the anode during the electrolysis of molten nabr?
a. Na+ (l) Na(l).
b. Br–(l).
c. Br^3–(I).
d. Br^2(g).
Reaction at anode
2 Br- (aq) -----> Br2 (g) + 2e-
The product formed at the anode is Br2 (g).
In chemistry and production, electrolysis is a technique that makes use of direct electric present-day (DC) to power an otherwise non-spontaneous chemical response.
Electrolysis is commercially crucial as a degree inside the separation of factors from clearly going on sources including ores the usage of an electrolytic cell.
The voltage that is wanted for electrolysis to occur is called the decomposition capacity. The word "lysis" way to split or break, so in phrases, electrolysis would imply "breakdown via power".
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A student weighs out a 7.24 g sample of , transfers it to a 300. mL volumetric flask, adds enough water to dissolve it and then adds water to the 300. mL tick mark. What is the molarity of zinc chloride in the resulting solutio
The molarity of the zinc chloride solution will be 0.089 M
MolarityMole of 7.24 g ZnCl2 = 7.24/136.286 = 0.5312 mol
Total volume of water used in preparing the solution = 300 + 300 = 600 mL
Molarity of the solution = mole/volume = 0.5312/0.6 = 0.089 M
The molarity of the zinc chloride solution is, therefore, 0.089 M
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Draw an atomic structure of Sodium (Na). What are sub-atomic particles?
Sodium represents by the (Na).
Write a balanced chemical equation for the reaction of solid vanadium(V) oxide with hydrogen gas to form solid vanadium(III) oxide and liquid water.
V₂O₅ (s) + 2H₂ (g) → V₂O₃ (s) + 2H₂O(l) is the balanced chemical equation for the reaction of solid vanadium(V) oxide with hydrogen gas to form solid vanadium(III) oxide and liquid water.
What is Balanced Chemical Equation ?The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.
The word based equation is
Vanadium(V) oxide + Hydrogen gas → Vanadium (III) oxide + Water
Now write the chemical equation
V₂O₅ (s) + 2H₂ (g) → V₂O₃ (s) + 2H₂O(l)
Reactant side Product side
V = 2 V = 2
O = 5 O = 5
H = 4 H = 4
We can see that the number of atoms on reactant side is equal to the number of atoms on product side. So the given equation is balanced.
Thus from the above conclusion we can say that V₂O₅ (s) + 2H₂ (g) → V₂O₃ (s) + 2H₂O(l) is the balanced chemical equation for the reaction of solid vanadium(V) oxide with hydrogen gas to form solid vanadium(III) oxide and liquid water.
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Can someone fill this out pleaseee for me
Filling out the table below following the outlined order:
Calcium - symbol = Ca; Group =2; Period = 4; Ar = 134; Am =40.078u; Ph = solid; Density = 1.55; Bp = 1757K; Mp = 1115K.Vanadium - symbol = V; Group =5; Period = 4; Ar = 197; Am =50.9415u; Ph = solid; Density = 6.11; Bp = 3680K; Mp = 2183K.Manganese - symbol = Mn; Group =7; Period = 4; Ar = 127; Am = 54.938044u; Ph = solid; Density = 7.21; Bp = 2334K; Mp = 1519K.Cobalt: - symbol = Co; Group =9; Period = 4; Ar = 125; Am =58.933195 u; Ph = solid; Density = 8.90; Bp = 3200K; Mp = 1768K.Zinc: - symbol = Zn; Group = 12; Period = 4; Ar = 134; Am =65.38 u; Ph = solid; Density = 7.14; Bp = 1180K; Mp = 692.68K.Arsenic: - symbol = As; Group = 15; Period = 4; Ar = 197; Am = 74.9216 u; Ph = solid; Density = 5.75; Bp = 889K; Mp = 889K.Bromine: - symbol = Br; Group =17; Period = 4; Ar = 120; Am = 79.904 u; Ph = Liquid; Density = 3.1028; Bp = 332K; Mp = 265K.Meaning of ElementAn element can be defined as a substance that can not be broken down into simpler substances.
An element serves as a building blocks for compounds and mixtures.
In conclusion, each element and its property as requested in the table are given above.
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6. M = mol solute
L solution
Rewrite this expression for L solution.
Answer:
L = mol solute / M
Explanation:
To rewrite the equation for liters (L), you need to:
M = mol solute / L <----- Given equation
M x L = mol solute <----- Multiply both sides by L
L = mol solute / M <----- Divide both sides by M
Hydrocarbons (typically petroleum products), which separate in water and have a Specific Gravity less than one, represents a significant hazard to firefighters. Why
Hydrocarbons (typically petroleum products), which separate in water and have a Specific Gravity of less than one, represent a significant hazard to firefighters. Why?
In water, hydrocarbons float to the surface. Water has limited impact on Class B Flammable Liquids and Gases fires, unless water is used to supply a Class B foam/water mixture that can slow the spread of flammable vapors and allow extinguishment by excluding oxygen. Hydrocarbons emit flammable vapors with a significant risk of fire.Describe hydrocarbons.Any member of the class of organic chemical compounds known as hydrocarbons only includes the atoms carbon (C) and hydrogen (H). The hydrogen atoms bond to the carbon atoms in a variety of ways to create the compound's structural framework.
What percentage of crude oil is made up of hydrocarbons?Although there could be thousands of different hydrocarbon molecules in a given crude oil, these descriptions only focus on the type of hydrocarbon that predominates in the combination. Typically, each sort of molecule can be found in all naturally occurring crude oils.
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below shows the dimensions of two colored cubes.
Dimensions of Cubes
Cube Side (cm) Mass (g)
Red: 4 12
Green: 3 10
Which cube is denser?
Red, because it has more volume and more amount of matter
Green, because it has less volume and less amount of matter.
Red, because it has less volume and more amount of matter
Green, because it has less volume and more amount of matter.
Green, because it has less volume and less amount of matter.
What is density?Density is the mass of a material substance per unit volume. d = M/V, where d is density, M is mass, and V is volume, is the formula for density. Grams per cubic centimeter are a typical unit of measurement for density.
Because it enables us to predict which compounds will float and which will sink in a liquid, density is a crucial notion. If an object's density is lower than the liquid's, it will often float.
The dimensions of two colored cubes.
Red: 4 12
Green: 3 10
density = mass/volume
so compare
[tex]12/4^{3}[/tex] and [tex]10/3^{3}[/tex]
None of the choices is the real reason. But is the closest. It is green because 10/27 > 12/64
But red would have been denser for a side of 3.9, and green would still have had less volume and less matter.
Green, because it has less volume and less amount of matter.
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The amount, in grams, of carbon tetrachloride that would be present, will be 22.99 grams.
Finding the mass from the number of particlesFor every one mole of any substance, there are 6.022 x [tex]10^{23}[/tex] atoms of particles. This is according to Avogadro.
Now, there are 9 x [tex]10^{22[/tex] particles in this particular carbon tetrachloride.
If 1 mole = 6.022 x [tex]10^{23}[/tex] particles
Then,
9 x [tex]10^{22[/tex] particles = 9 x [tex]10^{22[/tex] x 1/6.022 x [tex]10^{23}[/tex] particles
= 0.1495 moles
Carbon tetrachloride has the chemical formula CCl4 and has a molar mass of 153.82 g/mol.
Recall that: mole = mass/molar mass
Hence, mass = mole x molar mass.
Mass of 0.1495 moles CCl4 = 0.1495 x 153.82 = 22.99 grams
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EXPERIMENT 1: How do you expect your coarse titration volume at the color change to compare to your fine titration volumes?
In the endpoint when the indicator changes color it gives the information that the acid is neutralized by the base.
What is Titration ?Titration is also known as titrimetry is a technique where a solution of known concentration is used to calculate the concentration of the unknown solution. Titration is a laboratory technique.
What is Endpoint ?The point at which the indicator changes the color is known as Endpoint.
Thus from the above conclusion we can say that In the endpoint when the indicator changes color it gives the information that the acid is neutralized by the base.
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1. Explain why halogens are rarely found in native state?
Halogens are rarely found in native state because halogens are highly reactive.
What is Halogens ?The group 17 elements are known as Halogen group. These elements include Fluorine, Chlorine, Bromine, Iodine and Astatine. Halogens react with metals to form salts. Halogens are non metals. Halogens are highly reactive and halogens are never found in pure form. Halogens not occur in free state.
How many valence electron are present in Halogens ?Halogens have seven valence electrons in the outermost shell. The electronic configuration of Halogen is ns² np⁵.
Thus from the above conclusion we can say that Halogens are rarely found in native state because halogens are highly reactive.
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A photon has an energy of 2.88×10^-18 J . Convert energy into eV.
A photon has an energy of 2.88 × 10⁻¹⁸ J. The energy into eV is 17.97 eV.
What is Photon Energy ?The energy which is carried by a single photon is called Photon energy.
It is expressed as:
E = hf
where,
E = Photon energy
h = Planck's energy
f = Wave frequency
How to convert Joules (J) into Electron volt (eV) ?To convert J into eV
E(eV) = E(J) × 6.241509 × 10¹⁸
= 2.88 × 10⁻¹⁸ × 6.241509 × 10¹⁸
= 17.97 eV
Thus from the above conclusion we can say that A photon has an energy of 2.88 × 10⁻¹⁸ J. The energy into eV is 17.97 eV.
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Place the following substances in order of increasing vapor pressure at a given temperature. SF6 SiH4 SF4
Substances in order of increasing vapor pressure at a given temperature is SF4 < SF6 < SiH4
The substance with the lowest vapor pressure will also have the greatest boiling point. A liquid attribute associated with evaporation is vapor pressure. The distribution of kinetic energy among the molecules in a liquid (or any substance) is influenced by the system's temperature.How do you determine vapor pressure?Vapor pressure in chemistry is the force that an evaporating substance exerts against the walls of a sealed container (converts to a gas). Use the Clausius-Clapeyron equation to determine the vapor pressure at a specific temperature: ln(P1/P2) = (Hvap/R)((1/T2) - (1/T1)Which has highest vapor pressure?
At the normal boiling point of a liquid, the vapor pressure is equal to the standard atmospheric pressure defined as 1 atmosphere, 760 Torr, 101.325 kPa, or 14.69595 psi. For example, at any given temperature, methyl chloride has the highest vapor pressure of any of the liquids in the chart.Learn more about vapor pressure
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6) What is the pH of a solution with [H3O+] = 1 × 10-9 M?
A) 1.0 × 10-5
B) -9.0
C) 5.0
D) -5.0
E) 9.0
Answer:
E) 9.0
Explanation:
pH = -log [1×10^-9] = 9
A liquid solvent is added to a flask containing an insoluble solid. the total volume of the solid and liquid together is 81.0 ml. the liquid solvent has a mass of 40.5 g and a density of 0.865 g/ml. determine the mass of the solid given its density is 2.25 g/ml.
The mass of solid is 76.905 g.
Given that,
Total volume of solid and liquid = 81.0 mL
Mass of liquid = 40.5 g
Density of liquid = 0.865 g/mL
Density of solid = 2..25 g/mL
We need to calculate the volume of liquid
Using formula of density
[tex]Density = Mass/volume(V_{l} } )\\\\volume(V_{l} )=Mass/Density[/tex]
Put the value into the formula
[tex]V_{l} = 40.5/0.865\\\\V_{l} = 46.82 mL[/tex]
We need to calculate the volume of solid
Volume of solid = Total volume of solid and liquid- volume of liquid
[tex]V_{s} =81.0-46.82\\\\V_{s} =34.18 mL[/tex]
We need to calculate the mass of solid
[tex]P_{s}=M_{s} /V_{s} \\\\M_{s} =P_{s}V_{s}[/tex]
Using formula of density
Put the value into the formula
[tex]M_{s}=2.25 X 34.18\\\\M_{s}=76.905 g[/tex]
Hence, The mass of solid is 76.905 g.
What is density?A substance's density (more accurately, its volumetric mass density; sometimes known as specific mass) is its mass per unit volume. The most common symbol for density is (the lower case Greek letter rho).
There are three types of Density:
linear densitybulk densityarea densityLearn more about density :
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