1. What allowed fusion reactions to take place in the early universe?

Answer:

164.088 g/mol

Explanation: hope this helps

Answer:

Calcium nitrate

Explanation:

164.088 g/mol

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humus, topsoil, subsoil, parent rock

Answer:

either 1. organic, topsoil, subsoil, parent rock, bedrock or the opposite, 2. bedrock, parent rock, subsoil, topsoil, organic.

Explanation:

I study. :) Good luck!

The mole ratio between NH₃ and H₂O in the equation NH₃ + O₂ → NO + H₂O is 4:6, which can be simplified to 2:3.


To find the mole ratio between NH₃ and H₂O, you first need to balance the chemical equation.

The balanced equation is:

4NH₃ + 5O2 → 4NO + 6H₂O

Now, look at the coefficients in front of the molecules. For NH₃, the coefficient is 4, and for H₂O, it is 6. This means that in the balanced chemical reaction, 4 moles of NH₃ react to produce 6 moles of H₂O.

To find the simplest whole number mole ratio, divide both coefficients by the greatest common divisor (in this case, 2):
4/2 : 6/2 = 2 : 3
So, the mole ratio between NH₃ and H₂O is 2:3.

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Answer:

30 g

Explanation:

In order to convert from moles of CH₃COOH to grams, we need to use its molar mass:

Now we convert moles into grams:

So 0.5 moles of CH₃COOH have a mass of 30 grams.

The specific humidity of the air is 0.0085 kg H2O/kg dry air, the relative humidity is 34%, and the enthalpy of the air is 80 kJ/kg dry air. respectively.

To determine the specific humidity, relative humidity, and enthalpy of the air, we need to use the psychrometric chart. The psychrometric chart is a graphical representation of the thermodynamic properties of moist air and is used to determine various properties of moist air.

To determine the specific humidity of the air, we need to find the point on the psychrometric chart corresponding to the dry bulb temperature of 28°C and the wet bulb temperature of 15°C. From the chart, we find that the specific humidity of the air is approximately 0.0085 kg H2O/kg dry air.

To determine the relative humidity of the air, we need to find the ratio of the actual vapor pressure to the saturation vapor pressure at the dry bulb temperature of 28°C. From the psychrometric chart, we find that the saturation vapor pressure at 28°C is approximately 3.5 kPa, and the actual vapor pressure is approximately 1.2 kPa. Therefore, the relative humidity of the air is approximately 34%.

To determine the enthalpy of the air, we need to find the point on the psychrometric chart corresponding to the dry bulb temperature of 28°C and the specific humidity of 0.0085 kg H2O/kg dry air. From the chart, we find that the enthalpy of the air is approximately 80 kJ/kg dry air.

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To find the mass percent composition of an element, divide the mass contribution of the element by the total mass then multiply by 100.

The total mass = 200.0 g

Phosphorus mass = 87.28 g

Oxygen mass = 112.72 g

%composition of P:

=> (87.28 g/200.0g)*100

=> 43.64 %

%composition of O:

=> (112.72g/200.0 g)*100

=> 56.36 %

Answer: C

Explanation: The atomic number is fixed by the number of protons. An element will have an exact number of protons. The neutrons can vary, and they are the reason elements have isotopes (all the same number of protons, but some have differing numbers of neutrons). Electrons are too small to be counted in the atomic weight figures.

Answer:

0.6145M

Explanation:

Based on the chemical equation, 2 moles of MnO₄⁻ reacts with 5 moles of H₂C₂O₄.

To solve this problem, we need to find moles of MnO₄⁻, with the chemical equation the moles of H₂C₂O₄ and, the concentration of this solution.

Moles MnO₄⁻:

24.98mL = 0.02498L * (0.1968mol / L) = 4.916x10⁻³ moles MnO₄⁻

Moles H₂C₂O₄:

4.916x10⁻³ moles MnO₄⁻* (5 moles H₂C₂O₄ / 2 moles MnO₄⁻) =

0.01229 moles H₂C₂O₄

Molarity H₂C₂O₄:

0.01229 moles H₂C₂O₄ / 0.0200L =

Answer:

Explanation:

The partial pressure of the air in the sample can be found using the formula for Dalton's law of partial pressures, which states that the total pressure of a mixture of gases is equal to the sum of the partial pressures of the individual gases:

Total pressure = partial pressure of gas 1 + partial pressure of gas 2 + ...

In this case, we have two gases: air and water vapor. We know the total pressure of the mixture and the partial pressure of the water vapor, and we want to find the partial pressure of the air. We can set up the equation as follows:

Total pressure = partial pressure of air + partial pressure of water vapor

Substituting the given values:

100.18 kPa = partial pressure of air + 3.36 kPa

Solving for the partial pressure of air:

partial pressure of air = 100.18 kPa - 3.36 kPa

partial pressure of air = 96.82 kPa

Therefore, the partial pressure of the air in the sample is 96.82 kilopascals.

Answer:

This process is considered as a cycle because it continues and dosent stops. This process includes the evaporation of watet from earth surface due to heat.this water is converted in to water vapours. After reaching clouds it condences back. When the clouds become heavy with watef it falls back on earth as rain.and the process repeats.

Explanation:

Yes, it is correct, this reaction is an example of conjugate addition of a nucleophile to an α,β-unsaturated carbonyl.

In this type of reaction, a nucleophile attacks the carbon atom in the carbonyl group that is adjacent to the double bond (the α-carbon), forming a new carbon-carbon bond and creating a tetrahedral intermediate. The intermediate then collapses, resulting in the formation of a new carbon-carbon bond and the addition of the nucleophile to the double bond. An α,β-unsaturated carbonyl is a compound that contains a carbonyl group (C=O) and a double bond (C=C) in which the carbonyl carbon (C=O) and the double-bonded carbon (C=C) are adjacent to each other. An example of an α,β-unsaturated carbonyl compound is an unsaturated aldehyde or unsaturated ketone. These compounds are highly reactive and can undergo a variety of reactions such as conjugate addition, electrophilic addition, and nucleophilic addition reactions.

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False. Shrinkage is not a common problem encountered during hot filling.

Shrinkage refers to the reduction in volume or size of a material during cooling or solidification. In the context of hot filling, which is a process of filling liquid products into containers at high temperatures, shrinkage is not a typical problem.

Hot filling often involves using heat-resistant containers and filling the product at an elevated temperature to ensure microbial safety and product stability. The high temperature of the product and the container helps minimize any potential shrinkage that may occur during cooling.

However, other issues such as thermal expansion of the container or product, container deformation, or seal integrity may need to be addressed during the hot filling process. But specifically, shrinkage is not a common concern in this context.

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C/ If Fe is greater than Fg, the negatively charged oil droplet will move freely toward the negatively charged plate.

In the Millikan oil droplet experiment, the negatively charged oil droplets are subjected to an electric field created by the charged plates. The electric force (Fe) acts on the oil droplet in a direction opposite to the gravitational force (Fg). When Fe is greater than Fg, the electric force overcomes the gravitational force, causing the negatively charged oil droplet to experience an upward force. As a result, the oil droplet moves freely upward toward the negatively charged plate.

Option B is incorrect because if Fe is equal to Fg, the forces balance each other, resulting in a stationary droplet. However, the question states that Fe is increased until it is greater than Fg, implying that the droplet is no longer stationary but moves in response to the electric force.

Therefore, option C is the correct answer, as it describes the effect of an electric field on the motion of a negatively charged oil droplet in the Millikan oil droplet experiment.

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Coenzymes such as NADH and FADH2 are used to carry electrons to and from many kinds of oxidation/reduction reactions.

What are coenzymes?

A macromolecule that catalyses a chemical process is an enzyme. In other words, it creates the possibility of a negative reaction. Smaller molecules are used to construct enzymes to create an active component. The coenzyme is one of an enzyme's most crucial components.

Small molecules make up coenzymes. They are unable to catalyse reactions on their own, but they can assist enzymes in doing so. Coenzymes are organic nonprotein molecules that join with the protein molecule (apoenzyme) to create the active enzyme, according to the technical definition (holoenzyme).

In biological oxidation-reduction reactions, NADH and FADH2 are two coenzymes that are extremely important. Along with the transfer of electrons, hydrogen ions also occur.

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Answer:

C and D

Explanation:

Hope this helped!

Scientist who studies new types of medicine and  scientist who studies the chemistry of plants and fertilizer are examples of a biochemist ,therefore option (c and d ) is correct .

Biochemists are scientists who are trained in biochemistry.

They study chemical processes and chemical transformations in living organisms. Biochemists study DNA, proteins and cell parts .

Biochemist deals with the chemical processes occuring within living organisms .

Biochemist work-

A biochemist will typically conduct research projects, manage laboratory teams, prepare technical reports and present research findings to scientists .

Scientist who studies new types of medicine and  scientist who studies the chemistry of plants and fertilizer are examples of a biochemist, therefore option (c and d ) is correct .

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Answer:

reactants

Explanation:

a.) If too many samples are used – a larger sample size reduces the variability of the sample distribution.

As the sample size increases, the shape of the sampling distribution becomes closer to the normal distribution, regardless of the shape of the population.

b.) If too few samples are used - the samples may interfere with the extrapolation of the results.

Small sample sizes can make it difficult to determine whether certain results are true, and in some cases can lead to Type II errors. H. The null hypothesis was erroneously accepted and no differences between study groups were reported.

c.) If you use a solvent that is too polar - if the solvent is too polar, the components will not move well enough to separate again (Rf too small). The eluent is more or less polar. It should not be so polar as to dissolve the alumina or silica.

d.) When attempting to elute a spot of crystalline material that is only partially soluble in the eluent-  the material migrates through the stationary phase as a streak rather than as a single spot.

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Answer:

Sodium reacts with the oxygen in air. It reacts vigorously with oxygen and the moisture that is already present in the air and thus catches fire.

It would be a bad idea to make coins made of sodium metal, beacause of their reactive nature.

Those species which are not stable in nature and always ready to show reaction with another species, is known as reactive species.

Sodium metal is highly reactive in nature, means it easly reacts with the atmospheric oxygen and shows oxidation or with the moisture content of atmosphere as a result of which vigorously catches fire. That's why we don't use sodium to make coin.

Hence, beacause of reactive nature sodium is not used.

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An unsaturated hydrocarbon is a hydrocarbon that contains one or more carbon-carbon double bonds or triple bonds.

An unsaturated hydrocarbon is a hydrocarbon that contains one or more carbon-carbon double bonds or triple bonds. These double or triple bonds mean that the hydrocarbon has fewer hydrogen atoms per carbon than a saturated hydrocarbon. For example, ethane (C2H6) is a saturated hydrocarbon, while ethene (C2H4) is an unsaturated hydrocarbon. The double bond between the two carbon atoms in ethene means that there is only one hydrogen atom bonded to each carbon, rather than the two hydrogen atoms per carbon found in ethane.
Oxides of nitrogen are a group of gases that includes nitrogen oxide (NO), nitrogen dioxide (NO2), and nitrous oxide (N2O). They are produced naturally by lightning and microbial processes, but they are also produced by human activities, particularly the burning of fossil fuels. Oxides of nitrogen can have harmful effects on human health and the environment. They can react with other chemicals in the atmosphere to form smog, which can lead to respiratory problems, particularly for people with asthma or other lung conditions. They can also contribute to acid rain and the formation of ground-level ozone. In addition, nitrogen oxides are greenhouse gases, contributing to climate change. The physical properties of oxides of nitrogen vary depending on the specific gas, but they are generally colorless, odorless gases that are more dense than air.

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Answer:

wt= 3(23)+27+6(18.9)

                       =69+27+113.94

Explanation:

 =209.94 grams

Answer:

209.9 g mol

Explanation:

Answer:Depending how fast the max pulse rate is is how active you are

Explanation:

the lattice energy of MgH2() is 2791 kJ/mol with a series of step when the Enthalpies of formation for calcium hydrided is given.

An article publishing charge (APC) is required of authors or research funders to cover publication costs in open access journals that do not charge subscription fees. This guarantees that everyone will be able to access your article promptly and without charge in the future.

Solution:

the lattice energy of MgH2() is :

ΔHf(−75. 3 kJ/mol )  =S+0.5D+IE+EA+U

ΔHf(−75. 3 kJ/mol )= 2791 kJ/mol

The papers published in MDPI Special Issues are of extremely high quality! When I published my research with MDPI (Energies Journal), it was a wonderful experience. Both the submission of the manuscript and the timing of publishing were excellent.

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Answer:

Mass = 234 g

Explanation:

Given data:

Mass of NaCl produced = ?

Moles of chlorine = 2.0 mol

Solution:

Chemical equation:

2Na + Cl₂    →     2NaCl

now we will compare the moles of NaCl with chlorine gas.

           Cl₂           :          NaCl

             1            :           2

            2.0         :         2/1×2.0 = 4.0 mol

Mass of NaCl;

Mass = number of moles × molar mass

Mass = 4.0 mol × 58.5 g/mol

Mass = 234 g

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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Answer

Ultraviolet

Explanation

The types of radiation and their wavelength are:

Gamma < 10⁻¹² m

X-rays 1 nm - 1 pm

Ultraviolet 400 nm - 1 nm

Visible 750 nm - 400 nm

Near-infrared 2.5 μm - 750 nm

Infrared 25 μm - 2.5 μm

Microwaves 1 mm - 25 μm

Radio waves > 1 mm

Hence, the given wavelength of 2.86 X 10⁻⁸ m corresponds to Ultraviolet.

The production of calcium oxide in this reaction results in an approximate mass of 112.14 grams.

To determine the amount of calcium oxide produced in the reaction, we need to consider the stoichiometry of the reaction. The balanced equation for the reaction between limestone (calcium carbonate) and heat to produce calcium oxide and carbon dioxide is as follows:

CaCO\(_{3}\) → CaO + CO\(_{2}\)

According to the equation, the molar ratio between calcium carbonate and calcium oxide is 1:1. This means that for every 1 mole of calcium carbonate consumed, 1 mole of calcium oxide is produced.

To calculate the amount of calcium oxide produced, we can convert the mass of limestone (calcium carbonate) to moles using its molar mass and then use the mole ratio to determine the moles of calcium oxide. Finally, we can convert the moles of calcium oxide back to grams using its molar mass.

Given that the molar mass of calcium carbonate (CaCO\(_{3}\)) is 100.09 g/mol and the molar mass of calcium oxide (CaO) is 56.08 g/mol, we can proceed with the calculation.

Moles of calcium carbonate = 200 g / 100.09 g/mol = 1.999 moles

Moles of calcium oxide = 1.999 moles

Mass of calcium oxide = 1.999 moles × 56.08 g/mol ≈ 112.14 g

Therefore, approximately 112.14 grams of calcium oxide is produced in this reaction.

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The final temperature of the copper sample is 126.1 °C.

Given:

m = 73.17 g

T initial = 102.0°C

Q = 6800 J

c = 0.387 J/g x°C

Use the formula:

Q = mcΔT

where Q is the heat lost by the copper, m is the mass of the copper, c is the specific heat of the copper, and ΔT is the change in temperature of the copper.

Rearrange the formula:

ΔT = Q / mc

Substitute the values in the given equation:

ΔT = -6800 J / (73.17 g x 0.387 J/g x °C)

ΔT = -24.1 °C

The negative sign indicates a decrease in temperature.

In the final temperature, subtract the change in temperature from the initial temperature:

T final = T initial - ΔT

T final = 102.0 °C - (-24.1 °C)

T final = 126.1 °C

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Answer:

3750 m

Explanation:

We must first know the speed of sound in water in order to solve this problem.

So, speed of sound in water = 1500 meters per second

Now time taken = 5 seconds

Given that;

v = 2x/t

where x is the distance below;

vt = 2x

x = vt/2

x = 1500 * 5/2

x = 3750 m

Answer:

Light as a wave: Light can be described (modeled) as an electromagnetic wave. In this model, a changing electric field creates a changing magnetic field. This changing magnetic field then creates a changing electric field and BOOM - you have light. ... So, Maxwell's equations do say that light is a wave.

Explanation:

Hope this helps

Answer:

Light as a wave: Light can be described (modeled) as an electromagnetic wave. In this model, a changing electric field creates a changing magnetic field. This changing magnetic field then creates a changing electric field and BOOM - you have light. ... So, Maxwell's equations do say that light is a wave.

Explanation:

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