Answer: The main applications of oxygen in order of importance are: 1) melting, refining and manufacture of steel and other metals; 2) manufacture of chemicals by controlled oxidation; 3) rocket propulsion; 4) medical and biological life support; 5) mining, production and manufacture of stone and glass products.
Explanation:
How many moles of carbon dioxide are produced when 18.6 g of HF are reacted with an excess amount of sodium carbonate
0.4645 moles of carbon dioxide are produced when 18.6 g of HF are reacted with an excess amount of sodium carbonate.
To answer this question, we first need to write out the balanced chemical equation for the reaction between HF and sodium carbonate:
2HF + Na₂CO₃ -> 2NaF + CO₂ + H₂O
From this equation, we can see that for every 2 moles of HF that react, 1 mole of CO₂ is produced.
To determine the number of moles of HF in 18.6 g, we need to use the molar mass of HF, which is 20.01 g/mol:
moles of HF = mass / molar mass = 18.6 g / 20.01 g/mol = 0.929 moles
Since there is an excess amount of sodium carbonate, all of the HF will be consumed in the pressure reaction, so we can use the ratio of 2 moles HF to 1 mole CO₂ to calculate the number of moles of carbon dioxide produced:
moles of CO₂ = 0.929 moles HF x (1 mole CO₂ / 2 moles HF) = 0.4645 moles
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Which will be the best leaving group for a nucleophilic reaction?
Alkyl bromides, alkyl iodides, and alkyl chlorides are all typical reactants in laboratory nucleophilic substitution processes. The best leaving group among the four common halides (F, Cl, Br, and I) is iodide, which is the least basic of them all.
Do Sn1 or Sn2 require an excellent leaving group?
Sn1 and Sn2: Since both sn1 and sn2 reactions need strong leaving groups, the type of leaving group has no effect on the reaction. A extremely weak leaving group, however, might stop either reaction from happening at all.
What is nucleophilic substitution with leaving group ability?
When an electrophile that is positively charged attacks a nucleophile that is rich in electrons, the leaving group from the nucleophile is replaced.
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In what ways have members of the gray whale species been affected by efforts to protect biodiversity? Check all that apply.
They are currently endangered and almost extinct.
Their numbers have increased because of the Endangered Species Act.
Their numbers have increased mostly due to captive breeding.
They are still being hunted, and their numbers are declining.
They are an example of protecting biodiversity through the passage of laws.
Answer:
They are currently endangered and almost extinct.
Their numbers have increased because of the Endangered Species Act.
They are an example of protecting biodiversity through the passage of laws.
Note: The gray whale population has increased in some areas due to protection efforts and laws such as the Endangered Species Act, but they still face threats and challenges in other regions.
Explanation:
Which types of native organisms do feral hogs most likely compete with for food sources?
Answer:
Here...
Explanation:
The feral hogs are most likely to compete with Herbivore and Carnivor for food sources. Option C is correct.
Herbivore:It is a type of food habit or nature in which an animal only eats plant or plants derived products.
For example Deer, Cows, etc.
Carnivorous:It is a type of food habit or nature in which an animal only eats other animal or animal-derived food.
For example- Lion, tiger, etc.
Since, feral hogs are omnivores who can eat both small animals and plants,
Therefore, the feral hogs are most likely to compete with Herbivore and Carnivor for food sources.
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Science helPPPPPPPPP MEEEEEEEEE RIGHT NOW
4. with two values of the rate constant, the activation energy can be found using the following form of the arrhenius equation: �� �1 �ଶ ൌ െ�� � ൬ 1 �1 െ 1 �ଶ ൰ the rate constant for the conversion of cyclopropane to propene is 1.10 x 10-4 s-1 at 470 °c and 1.02 x 10-3 s-1 at 510 °c. what is the activation energy?
The activation energy is approximately -18.4 J/mol. To find the activation energy, we can use the Arrhenius equation in the given form: ln(k2/k1) = -(Ea/R) * (1/T2 - 1/T1).
Using equation : ln(k2/k1) = ln(1.02 x 10^(-3) s^(-1) / 1.10 x 10^(-4) s^(-1)) = ln(9.27) ≈ 2.22. (1/T2 - 1/T1) = (1/510 °C - 1/470 °C) = (1/783 K - 1/743 K) = 4.85 x 10^(-4) K^(-1).
Substitute these values into the equation Ea: 2.22 = -(Ea/8.314 J/(mol K)* (4.85 x 10^(-4) K^(-1)) Ea ≈ -2.22 * 8.314 J/mol ≈ -18.4 J/mol. The activation energy is approximately -18.4 J/mol. Please note that the negative sign indicates an exothermic reaction.
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Help me plz I don’t know what it’s mean
Answer:
1 has the highest density because it has the most amount of circles in the least amount of space- it is the most densely filled with circles; it is the most dense.
Answer:
image 1 would have the highest density
Explanation:
the closer the molecules are the more solid an object is. if the molecules are far apart and rarely bump into eachother, it is more gaseous. the object in the middle (2) is a liquid
which is not a form of chlorine used to disinfect water? a) chlorine gas b) chloroform c) sodium hypochlorite d) calcium hypochlorite
The answer is b) chloroform. Chlorine gas, sodium hypochlorite, and calcium hypochlorite are all forms of chlorine commonly used to disinfect water.
Chloroform, on the other hand, is a different chemical compound and not a form of chlorine used for water disinfection.
The levels of chlorine used for disinfection of drinking water causes long-term health effects because chlorine is toxic substance that greatly damaged cells and tissues of our body. Chlorine has low protection against protozoa due to its ineffectiveness on the protozoans organisms.
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What kind of intermolecular forces act between a formaldehyde (H 2
CO) molecule and a hydrogen chloride molecule? Note: If there is more than one type of intermolecular force that acts, be sure to list them all, with a comma between the name of each force.
Formaldehyde (H2CO) has dipole-dipole, dipole-induced dipole and dispersion forces. In addition to this, the hydrogen chloride (HCl) molecule has dipole-dipole, dipole-induced dipole, and hydrogen bonding forces.
Dipole-dipole forces are a type of intermolecular forces that occur when two polar molecules come close to one another. A polar molecule has a net dipole because of the presence of polar covalent bonds.Dipole-dipole forces occur between the positive and negative ends of dipoles. Since formaldehyde (H2CO) is a polar molecule due to the presence of an oxygen atom in the molecule. This type of intermolecular force occurs in formaldehyde.Hydrogen bonding forcesWhen hydrogen is bonded with an electronegative element such as nitrogen (N), oxygen (O), or fluorine (F), it creates a strong intermolecular force known as hydrogen bonding.
Hydrogen bonding occurs in hydrogen chloride (HCl) due to the electronegativity difference between hydrogen and chlorine. Dipole-induced dipole forcesDipole-induced dipole forces arise when an ion or polar molecule induces a dipole in a non-polar molecule. Dipole-induced dipole forces exist between formaldehyde and hydrogen chloride molecules. Dispersion forcesDispersion forces arise when electrons in two non-polar atoms or molecules interact. Dispersion forces act between both molecules, H2CO and HCl.
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How
many
molecules are in 8.55x10-15 moles of a substance
Answer:
Know this
1mole of a substance contains 6.022x10²³molecules
Now
8.55x10^-15moles x 6.022x10²³molecules/1mole
=5.15x10^9molecules.
The movement of what ion is reflected in the rising phase of the action potential? Choose the correct option. A) Inward Na+ B) Outward K+ C) Outward Na+ D) Inward K+
The movement of A) Inward Na+ ion is reflected in the rising phase of the action potential.
An action potential is an accelerated sequence of voltage changes across a membrane. At any given time, the tissue voltage, or potential, would be determined by the relative magnitude relation of ions, the company would benefit from intracellular, as well as the flowability of each ion.
Action potentials (the electrical impulses which thus send signals throughout your body) are nothing but a transitory shift in the membrane potential of the neuron caused by ions flowing in and out of the part of the brain.
An action potential seems to be a swift sequence of voltage changes across a membrane. At any given time, the membrane voltage, but rather potential, is dependent on the relative percentage of ions, ds14 to intracellular, as well as the permeation of each ion.
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The data found below measure the amounts of greenhouse gas emissions from three types of vehicles. The measurements are in tons per year, expressed as CO2 equivalents. Use a 0.025 significance level to test the claim that the different types of vehicle have the same mean amount of greenhouse gas emissions. Based on the results, does the type of vehicle appear to affect the amount of greenhouse gas emissions? Click the icon to view the data. What are the hypotheses for this test? A. H 0
:μ 1
=μ 2
=μ 3
H 1
: At least one of the means is different from the others. B. H 0
: At least one of the means is different from the others. H 1
:μ 1
=μ 2
=μ 3
C. H 0
:μ 1
=μ 2
=μ 3
H 1
:μ 1
=μ 2
=μ 3
D. H 0
:μ 1
=μ 2
=μ 3
H 1
:μ 1
=μ 2
=μ 3
Determine the test statistic. F (Round to two decimal places as needed.)
Answer: A. H 0 μ1 = μ2 = μ3
Ha μ1 ≠ 2μ ≠ μ3
2. Test Statistics is 95%
3. Critical F-Value is 3.76.
4. P-Value is 2.32.
5. Conclusion Reject the null hypothesis.
6. Type of vehicle does effect the amount of green house gas emissions.
The correct order of the steps of a hypothesis test is given below.
1. Determine the null and alternative hypothesis.
2. Select a sample and compute the critical value F-test for the sample mean.
3. Determine the probability at which you will conclude that the sample outcome is very unlikely.
4. Make a decision about the unknown population.
All steps are performed in the given sequence to test a hypothesis.
The null hypothesis is rejected or accepted on the basis of level of significance. When the p-value is greater than level of significance we fail to reject the null hypothesis and null hypothesis is then accepted. It is not necessary that all null hypothesis will be rejected at 95% level of significance. To determine the criteria for accepting or rejecting a null hypothesis we should also consider p-value.
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Explanation:
Determine the pressure of a 6.4L sample of oxygen gas at 300K and 100KPa, after the gas is compressed to 2.40L at 900K.
The pressure : 800 kPa
Further explanationBoyle's law and Gay Lussac's law
\(\tt \dfrac{P_1.V_1}{T_1}=\dfrac{P_2.V_2}{T_2}\)
P1 = initial gas pressure (N/m² or Pa)
V1 = initial gas volume (m³)
P2 = gas end pressure
V2 = the final volume of gas
T1 = initial gas temperature (K)
T2 = gas end temperature
The pressure after the gas is compressed :
\(\tt \dfrac{100\times 6.4}{300}=\dfrac{P_2\times 2.4}{900}\\\\P_2=800~KPa\)
A victim’s body was found at a crime scene at 6:00AM with a body temperature of 90°F, at an outside temperature of 65°F. What was the likely Time of death?
To estimate the time of death, we can use the formula for determining the time since death based on the body temperature:
Hours since death = (initial body temperature - measured body temperature) / cooling rate
The cooling rate for a body in a moderate environment is generally assumed to be about 1.5°F per hour. Using this information, we can calculate the time of death as follows:
1. First, we need to calculate the number of degrees the victim's body temperature needs to drop to reach the outside temperature.
Initial body temperature - outside temperature = 90°F - 65°F = 25°F
2. Next, we can calculate the number of hours that have passed since the victim died:
Hours since death = (initial body temperature - measured body temperature) / cooling rate
Hours since death = (90°F - measured body temperature) / 1.5°F per hour
3. We can solve for the unknown variable (measured body temperature) by substituting in the information we have:
Hours since death = (90°F - 90°F) / 1.5°F per hour
Hours since death = 0 hours
This means that the victim likely died around 6:00AM, which is when the body was found. However, it's important to note that this is just an estimate, and there are many factors that can affect the cooling rate of a body, such as clothing, humidity, and ambient temperature. Therefore, the actual time of death may be different.
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a mole of an ideal gas at pressure 5.20 atm and temperature 304 k expands isothermally to double its volume. what is the work done by the gas (in j)
The work done by the gas during the isothermal expansion is 1762.7 J.
To find the work done by an ideal gas during an isothermal expansion, we can use the formula:
W = nRT ln(V2/V1)
Where W is the work done, n is the number of moles of gas, R is the universal gas constant, T is the temperature in Kelvin, V1 is the initial volume, and V2 is the final volume.
Given:
n = 1 mole
R = 8.314 J/mol*K
T = 304 K
V1 = V (initial volume)
V2 = 2V (final volume)
Plugging in the given values into the formula:
W = (1 mole)(8.314 J/mol*K)(304 K) ln(2V/V)
W = (1 mole)(8.314 J/mol*K)(304 K) ln(2)
W = 2543.6 J * 0.693
W = 1762.7 J
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Which of the following is an example of using creativity while doing background research?
Organizing data in tables
Validating results by repetition
Drawing a conclusion
Writing a hypothesis
Answer:
B
Explanation:
Answer:
D. Writing a hypothesis
Explanation:
Pleaseee helppp!! Pleaseee
Answer:
10CO²+4H²O
Explanation:
that Brainliest me pls
A student collected the following data in the laboratory:Mass of vitamin C tablet used0.5500 g Concentration of NaOH solution, M 0.1010 MInitial buret reading, mL0.50 mLFinal buret reading, ml23.78 mlwhat volume in liters of naoh solution was used in the titration?
The volume of NaOH solution used in the titration is 0.02328 L.
The volume of NaOH solution used in the titration can be calculated by subtracting the initial burette reading from the final burette reading.
Initial burette reading = 0.50 mL
Final burette reading = 23.78 mL
Volume of NaOH solution used = Final burette reading - Initial burette reading
Volume of NaOH solution used = 23.78 mL - 0.50 mL
Volume of NaOH solution used = 23.28 mL
To convert the volume from mL to L, we can use the conversion factor 1 L = 1000 mL:
Volume of NaOH solution used = 23.28 mL × (1 L / 1000 mL)
Therefore, Volume of NaOH solution used = 0.02328 L
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Carbonic acid, H₂CO₃ is a diprotic acid with Ka1 = 4. 3 × 10⁻⁷ and Ka2 = 5. 6 × 10⁻¹¹. What is the pH of a 0. 47 M solution of carbonic acid?
Based on the calculations, the pH of a 0.47 M solution of carbonic acid (H₂CO₃) is equal to 3.35.
How to calculate the pH of a solution?First of all, we would write a properly balanced chemical equation for these chemical reactions:
H₂CO₃(aq) ⇄ HCO₃⁻(aq) + H⁺(aq); Ka₁ = 4.3 × 10⁻⁷.
For the second chemical reaction:
HCO₃⁻(aq) ⇄ CO₃²⁻(aq) + H⁺(aq); Ka₂ = 5.6 × 10⁻¹¹.
Next, we set up an equation from the ICE table;
[HCO₃⁻] = [H⁺] = x.
[H₂CO₃] = 0.47 - x.
Ka₁ = ([HCO₃⁻] × [H⁺])/[H₂CO₃].
4.3 × 10⁻⁷ = (x × x)/(0.47 - x).
4.3 × 10⁻⁷ = x²/(0.47 - x).
x² = 0.0000002021 - 4.3 × 10⁻⁷x
x² + 4.3 × 10⁻⁷x - 0.0000002021 = 0
By solving the quadratic equation, we have:
x = [H⁺] =0.000449 M.
Now, we can determine the pH by using this formula;
pH = -log[H⁺]
pH = -log(0.000449 M).
pH = -(-3.35)
pH = 3.35.
Note: The second dissociation from Ka₂ would be so small, so it's considered negligible.
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Which of the following statements holds true for a chemical change?
A.
In a chemical change, no new substance is formed.
B.
In a chemical change, a substance changes its phase.
C.
In a chemical change, the molecular structure of a substance changes.
D.
In a chemical change, one substance dissolves into another.
A cool water sample absorbed 3,135 J of
energy from hot metal. The temperature
of the 63.0 g piece of metal changed
from 382 °C to 20.0 °C. What is the
specific heat of the metal?
Cmetal = [?] °C
qH20 3,135 J
=
Romomber
Answer:0.137
Explanation:
La siguiente ilustración muestra un purificador de agua que utiliza energía solar.
———————————————
Cuál de las siguientes especificaciones es una limitación del sueño del purificador de agua solar?
Answer:
Requiere que el agua pase por membranas de filtración.
Explanation:
Un purificador de agua que utiliza energía solar es un dispositivo innovador y tecnológico que funciona como una estación de saneamiento básico con capacidad para purificar el agua y eliminar el 99% de virus y bacterias.
El sistema funciona de la siguiente manera: cuenta con bomba, panel solar, cargador y mangueras. La bomba mueve el agua a través del filtro utilizando la energía de la batería que se carga con la energía de la luz solar. Incluso en días con poca exposición al sol, el sistema es capaz de utilizar la energía acumulada de la batería y purificar 1 litro de agua en 1 minuto.
Se trata de una tecnología simple e innovadora que puede ser de gran ayuda en el saneamiento básico de lugares que no contienen agua potable, debido a la facilidad y portabilidad del sistema.
Hot water heaters often have warning labels indicating that injuries can result when the temperature of the water is above 125°F. What is this temperature in degrees Celsius and in kelvins?
Answer: 51.6667c 324.817K
Explanation:
125°F temperature in degrees Celsius is 51.67 °C and in kelvins is 324.67 kelvin.
Temperature is a bodily amount that expresses the hotness of a count number or radiation. There are 3 kinds of temperature scales.
Temperature is the diploma or depth of the warmth present in a substance or a machine, expressed primarily based on the comparative scale and proven by a thermometer. In other phrases, Temperature is the degree of hotness or coldness of a frame measured by the usage of Celsius, Kelvin, and Fahrenheit scales.
Temperature is measured with thermometers. commonplace thermometers include a tumbler rod with a totally skinny tube in it. The tube carries a liquid that is furnished from a reservoir, or "bulb," at the base of the thermometer. every now and then the liquid is mercury, and every so often it is pink-colored alcohol.
To convert °C into Fahrenheit:-
F = 9/5 °C + 32
°C = (F - 32)× 5/9
= (125 -32) × 5/9
= 93 × 5/9
= 51.67 °C
°C into Kelvin:-
K= °C + 273
k = 51.67 + 273
= 324.67 kelvin.
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what is the bond order for a second-period diatomic particle containing five electrons in antibonding molecular orbitals and eight electrons in bonding molecular orbitals?
The bond order for a second-period diatomic particle containing five electrons in antibonding molecular orbitals and eight electrons in bonding molecular orbitals is 1.5
Bond order is defined as the number of electrons in bonding molecular orbitals minus the number of electrons in antibonding molecular orbitals divided by two. As a result, we may determine the bond order of this diatomic particle by the formula: Bond order = (number of bonding electrons - number of antibonding electrons) / 2
Bond order = (8 - 5) / 2
Bond order = 1.5.
This diatomic molecule, according to the bond order, is a stable molecule since the bond order is greater than 1, indicating that it is a double bond. The molecule has an overall bond strength that is greater than a single bond, but not as strong as a triple bond. So therefore he bond order for a second-period diatomic particle containing five electrons in antibonding molecular orbitals and eight electrons in bonding molecular orbitals is 1.5
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The haber process can be used to produce ammonia (nh3) from hydrogen gas (h2) and nitrogen gas (n2). the balanced equation for this process is shown below. 3h2 n2 right arrow. 2nh3 the molar mass of nh3 is 17.03 g/mol. the molar mass of h2 is 2.0158 g/mol. in a particular reaction, 0.575 g of nh3 forms. what is the mass, in grams, of h2 that must have reacted, to the correct number of significant figures? 0.1 grams 0.102 grams 0.10209 grams 0.1021 grams
The mass of hydrogen reacted with nitrogen to give ammonia is 0.1 grams.
How we calculate the mass from moles?
Mass of any substance will be calculated by using the moles as:
n = W/M, where
W = required mass
M = molar mass
Given chemical reaction is:
3H₂ + N₂ → 2NH₃
Moles of 0.575 g of NH₃ will be calculated as:
n = 0.575g / 17.03g/mol = 0.033 moles
From the stoichiometry of the reaction, it is clear that:
2 moles of NH₃ = produced by 3 moles of H₂
0.033 moles of NH₃ = produced by 3/2×0.033=0.0495 moles of H₂
Now we calculate the mass of hydrogen from the given moles and molar mass as:
W = (0.0495mol)(2.0158g/mol) = 0.09 grams = 0.10 grams
Hence, option (a) is correct i.e. 0.1 grams.
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The complete hydrolysis of a protein produces a mixture of? polypeptides free amino acids polypeptides and free amino acids dipeptides and free amino acids
The complete hydrolysis of a protein produces a mixture of free amino acids.
Acids are molecules or ions that can donate protons, known as Bronsted-Lowry acids, or form covalent bonds with electron pairs, known as Lewis acids. The first category of acids is proton donors or Brønsted-Lowry acids.
No oil is either an acid or a base. Neutral. Oil is a neutral, nonpolar chemical. That is, it is a viscous liquid at room temperature. It is immiscible with water, but soluble in alcohol and ether. Whole eggs are relatively pH neutral, but egg whites are one of the few foods that are naturally alkaline, with an initial pH of as high as 7.6 when eggs are laid, but the alkalinity increases as eggs age and reach increases. the pH of 9.2.
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With the high sedimentation and evaporation rates associated
with most dams and reservoirs, are they really a sustainable and
efficient way to store water?
Dams and reservoirs can provide reliable water storage but have potential environmental impacts such as habitat loss and disruption of natural flow.
Sedimentation can reduce the storage capacity of reservoirs over time, requiring periodic dredging or desilting to maintain efficiency. Evaporation can lead to water loss from the reservoir, particularly in arid or semi-arid regions with high evaporation rates. These factors need to be carefully managed to ensure the long-term sustainability and efficiency of water storage.
Sedimentation and evaporation are important considerations that need to be managed. Social and economic impacts should also be assessed. Alternative approaches and improved water management practices can enhance sustainability and efficiency. Careful planning, impact assessments, stakeholder engagement, and monitoring are crucial for mitigating negative impacts and maximizing benefits.
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An indicator is used in a titration toshow when _It does this bychanging color.A there has been a change in temperatureB. to add more waterC. an equal number of moles of acid and base are present
ANSWER
EXPLANATION
Firstly, we need to define the word titration.
Titration is defined as a technique that is used to determine the known concentration of an unknown solution.
This normally occurs between an acid and a base
During titration, an indicator changes color when equilibrium has been attained between the two solutions. The solutions are normally acid and base. At equilibrium, the number of moles of acid is equal to the number of base.
Therefore, the correct answer is option C
The blending of two different alleles to create a third unique phenotype. Example: snapdragon: red X white --- > pink
So, incomplete dominance is a type of genetic inheritance where the phenotype of a heterozygous individual is an intermediate between the two homozygous phenotypes.
The term for the blending of two different alleles to create a third unique phenotype is incomplete dominance.
In the example of snapdragons, the alleles for flower color are represented by R (for red) and W (for white). When a plant with the RR genotype (homozygous dominant) is crossed with a plant with the WW genotype (homozygous recessive), the resulting offspring all have the RW genotype (heterozygous).
In incomplete dominance, the heterozygous phenotype is intermediate between the two homozygous phenotypes. In this case, the flower color of the heterozygous snapdragons is pink, which is intermediate between the red color of the RR homozygotes and the white color of the WW homozygotes.
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Please help
according to the ____ rule, elements tend to react until they have the same electron configuration as a _____. _____, found on the left of the _____, tend to lose electrons and from ____. _____ tend gain electrons to form _____.
Answer:
What chapter is this and what grade are you, i can check this for you
Explanation: