a solution of ammonia and water contains 1.00×1025 water molecules and 6.00×1024 ammonia molecules. how many total hydrogen atoms are in this solution?

Answer:

1CH₄ + 2O₂ -> 1CO₂ + 2H₂O

Explanation:

Reactants:

1 C

4 H

4 O

Products:

1 C

4 H

4 O

The equation is balanced.

The universe as we know it is home to several galaxies, planets and stars. Hydrogen and helium were the most abundant elements present in the early universe. Heavier elements like carbon, oxygen, phosphorus and even metals were later formed through various fusion reactions in stars.

Nevertheless, matter makes up only 5% of the universe. Nearly 95% is referred to as 'dark matter' which is a subject of research in many scientific communities.

Answer: A) 5%

Answer:

38 electrons

Explanation:

Strontium atoms have 38 electrons and the shell structure is 2.8. 18.8. 2.

Prompt neutrons are the kind that are produced nearly immediately after the fission reaction.

The period for the reactor to triple its power in 10 seconds is ln 3 / α =

ln 3 / (ln 3 / 10) = 10 seconds and the reactivity p needed is -0.8946.

In other words, all the neutrons that are produced in a fission reaction are considered prompt neutrons.

We have to find the period for the reactor to triple its power in 10 seconds, given that all the neutrons are prompt, and the prompt neutron lifetime is 0.002 seconds.

We must also determine the reactivity p required in part a.

The formula that relates the reactivity to the mean generation time is given below:

ρ = (k-1) / k Here,

k = t / (t + β)

In this equation,

t is the average generation time, and

β is the delayed neutron fraction.

For a reactor in which all neutrons are prompt, β is zero, which implies that the reactivity is simply equal to k - 1.

As a result,

ρ = k - 1

Let us find k first.

k = t / (t + β)

= t / t

= 1ρ

= k - 1

= 1 - 1

= 0

A reactivity of 0 indicates that the reactor is at a critical point. As a result, the reactor is critical and has no external source.

For the reactor to triple its power in 10 seconds, we must first determine the alpha value.

We'll use the following equation for this:

dP / P = α dt

The solution to this equation is:

P(t) = P0 eαt

For a tripling of power, we require:

P(t) = 3P0P(t)

= P0 eαt

3 = eαtαt

= ln 3t

= ln 3 / αIn 10 seconds,

the reactor must triple its power, so the reactor should be set to run for a period ofln 3 / α = 10 seconds.

The alpha value, on the other hand, is still unknown.

However, we can use the following formula to compute it:

d/dt n(t) = s(t) + (k+1)/1 n (t)where k is the effective multiplication factor which is the ratio of the neutron production rate to the neutron loss rate from the reactor.

At a critical state, k=1 and

the term (k+1)/1 = 2

Thus, d/dt n(t) = s(t) + 2n(t)It is given that all the neutrons produced in the reactor are prompt,

i.e., β = 0

This implies that

α = k eff / (1- β )

= k eff

= k

The above equation reduces to:

d/dt n(t) = s(t) + 2n(t) = k n(t)

By rearranging and integrating we get,

ln(n(t)) = k t + C

By applying the initial condition that the reactor is critical at time t=0, i.e., n(0) = n0

We get, C = ln(n0)

Now, ln(n(t)) = k t + ln(n0)

Taking antilog, we get, n(t) = n0 ekt

The rate of change of power is proportional to the rate of change of neutron population, i.e.,

dP/dt = [k eff β - (1- β )/L] P where

L is the neutron lifetime and

β is the delayed neutron fraction.

For a reactor in which all neutrons are prompt, β is zero, which implies that the rate of change of power is:

dP/dt = k PdP/P = k dt

Integrating we get, P(t) = P0 ekt

By applying the initial condition that the reactor is critical at time t=0, i.e.,

P(0) = P0We get,

P0 = P0 e0

This implies that e0 = 1

Taking the natural log of both sides of the equation,

P(t) / P0 = ekt

Taking natural logarithms of both sides of this equation yields,

ln(P(t) / P0) = k tln

(P(t) / P0) / t = k

Rearranging we get,

k = ln(P(t) / P0) / t

Now, the reactor should be run for

ln 3 / α = 10 seconds, which implies that

α = ln 3 / 10

Substituting this value in the above equation we get,

k = ln(P(t) / P0) / t

= ln(3P0 / P0) / 10

= ln(3) / 10

= 0.1054

Substituting this value in the equation for reactivity

ρ = k - 1

= 0.1054 - 1

= -0.8946

Therefore, the period for the reactor to triple its power in 10 seconds is ln 3 / α = ln 3 / (ln 3 / 10) = 10 seconds and the reactivity p needed is -0.8946.

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The volume of the gas in a sealed container would be decreased at constant pressure: C. by raising the temperature.

Charles law states that when the pressure of an ideal gas is kept constant, the volume of a gas is directly proportional to the absolute temperature of the gas.

This ultimately implies that, the volume of a gas decreases at constant pressure when its temperature is decreased and vice-versa.

In conclusion, we can infer and logically deduce that the volume of the gas in a sealed container would be decreased at constant pressure by raising the temperature in accordance with Charles law.

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Answer:

5.5e-13

Explanation:

Divide the mass value by 1e+15

The hammer and the feather are dropped from  same height by the astronaut on the planet without the air. The feather will fell at the same rate as the the hammer.

The hammer and the feather are dropped from equal  height by the astronaut on the planet without the air. They were the essentially in the vacuum, and there was the no air resistance and because of the feather will fell at the same rate as compared to the hammer, the Galileo had to concluded that the hundreds of the years before.

All the objects that released together will fall at the same rate excluding the factor of the mass.

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Using Bohr's equation for the energy levels of the electron in the Hydrogen atom, determine the energy in J of an electron in the n=4 level.

According to Boh'rs equation we can calculate the energy using this equation:

En = - 2.18 * 10⁻¹⁸ J / (n²)

So if we want to find the energy we only have to replace n by 4 and solve that calculation:

since n = 4

En = - 2.18 * 10⁻¹⁸ J / 4²

En = - 2.18 * 10⁻¹⁸ J / 16

En = -1.36 * 10⁻¹⁹ J

So the answer is option D

The final state of the methane once the system equilibrates is T = 458.53K

Total heat added, Q-42 kJ

mass of methane, m = 32 g

Initial temperature 170 °C=103 K

boiling point = - 161.5 °C=111.5 K

Heat required to raise the temperature upto boiling point,

q1 =m x cp x delta T

     =32 x 3.48 x (111.5-103)

      =946.56 J

      = 0.94656 kJ

moles of methane = mass of methane/molar mass of methane =32g/16g/mol

=2moles

Heat required to change it to vapour form,

q2 = 2x = x delta H vap

    = 2 x 8.20

    = 16.4 kJ

Let the final temperature be T

Heat required to raise the temperature from 111.5 K to T,

q3= m x cp x delta T

    =32 x 2.22 x (T-111.5)

     = 0.07104 × (T-111.5)

Total heat added = q₁ +q2+q3

42= 0.94656 kJ + 16.4 kJ + 0.07104 × (T-111.5)

42=17.34656kJ+ 0.07104 × (T-111.5)

24.65344 = 0.07104 × (T-111.5)

347.03 T-111.5

T= 458,53 K

Hence, the final state of the methane once the system equilibrates is T = 458.53K

What do you know about methane?

Methane, dreary, scentless gas that happens bounteously in nature and as a result of specific human exercises. Methane is the least complex individual from the paraffin series of hydrocarbons and is among the most intense of the ozone depleting substances. Its synthetic recipe is CH4.

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Answer:

4.70 grams of NH4Cl is needed to prepare 350 mL of a 0.25 M ammonium chloride solution.

We need approximately 4.68 grams of NH4Cl to prepare a 0.25 M ammonium chloride solution with a volume of 350 mL.

To determine the mass of NH4Cl needed to prepare the solution, we us use the formula:

m=M x V x MM ... (i)

where,

m= mass in grams

M=molarity of solution

MM= molar mass of compound

V= volume in litres

The number of moles of NH4Cl needed can be calculated using:

  Moles = Molarity x Volume ...(ii)

  Moles = 0.25 mol/L x 0.350 L

  Moles = 0.0875 mol

Hence we can replace M x V with number of moles in equation i.

The molar mass of NH4Cl is :

  Molar mass of NH4Cl = (1 x 14.01 g/mol) + (4 x 1.01 g/mol) + (1 x 35.45 g/mol)

  Molar mass of NH4Cl = 53.49 g/mol

We have all the variables

Putting them in equation i.

Hence,

  Mass (g) = Moles x Molar mass

  Mass (g) = 0.0875 mol x 53.49 g/mol

  Mass (g) = 4.68 g

Therefore, you would need approximately 4.68 grams of NH4Cl to prepare a 0.25 M ammonium chloride solution with a volume of 350 mL.

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This beam separation should allow for easy separation of the two ions .∆R = 4 cm if the beam consists of a mixture of 12C and 14C ions.

A simple example of chemical separation is the use of desiccants to remove water from a gas stream. The percentage of carbon dioxide in blast furnace gas may be determined by measuring the thermal conductivity of the gas before and after selective removal of the carbon dioxide by passing the gas through soda lime.

The Parties agree that the termination of the employment relationship between the Parties shall be treated as a separation by mutual agreement of the Parties.

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Answer:

Thorium

Explanation:

I hope it's correct ;))

Answer:

freezing

Explanation:

When a solid reaches the temperature of its melting point, it can become a liquid. For water, the temperature needs to be a little over zero degrees Celsius (0oC) for you to melt. ... The reverse of the melting process is called freezing. Liquid water freezes and becomes solid ice when the molecules lose energy.

hope it becomes helpful to you ☺️☺️

good luck

Answer:

Melting and boiling point

Explanation:

For all group 1 elements, the melting and boiling point of the various members of the group decreases down the group. Hence, as the elements become heavier, they tend to have lower melting and boiling points.

Thus in moving from lithium to francium, there is a steady decrease in the melting and boiling points of elements down the group.

Answer:

A. oxygen

Explanation:

because that oxygen is made up of only one element  (that element is Oxygen) it rules out oxygen being a mixture unless you add something like nitrogen but then it would not be oxygen anymore

Answer:Granite forms as magma cools far under the earth's surface. Because it hardens deep underground it cools very slowly. This allows crystals of the four minerals to grow large enough to be easily seen by the naked eye. Look at the photo of granite above, notice the different crystals in the rock

Explanation:

Answer:

in w

Explanation:

first blood enter renal artery which enter glomerous( where blood is filtrated) and then to Bowman carpusle(take the filtrated blood)

and then to proximal tubular(absorbed salt) and then to loop of hanle (y)(absorb water) and then to distal tubule then to ureter (z) and then to renal vein(x)(to go to urinary bladder)

Answer:

The water was evaporated from the sun only leaving salt in the cup

Explanation:

the sun done its cycle and the salt was left

Maryann and josh left a cup of ocean water in the sun. When they returned a day later only salt was left in the cup because of the evaporation.

The evaporation is a process by which an element in liquid sate gets  transfer into  from its liquid state to gas below the temperature at which the liquid gets boiled  liquid water enters the atmosphere as water gets vaporized.

In the following the salt was in liquid state so converts into solid and liquid turns into gaseous state and salt is remained into the cup.

Therefore, Maryann and josh left a cup of ocean water in the sun. When they returned a day later only salt was left in the cup because of the evaporation.

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Answer:

the number of crickets in each container

Explanation:

to participate in the experiment you will have to know the crickets in the container

Answer:

Electromagnet

Explanation:

Answer:

I'm assuming you need to label above the lines. So, above the line where the  Cretaceous period ends is mass extinction and where the bracket lies is adaptive radiation.

Explanation:

Mass extinctions are periods of time where the organisms are essentially wiped out in an extremely brief period of time. You can see how the species just drops off. Adaptive radiation occurs when there is a diversification of a group of organisms as evident by the rise in the number of marine animal groups shown by the bracketed area.

Answer:

A,C

Explanation:

a. The population in the case of a chemical process being run 15 times and yield being measured each time is the population of yields. The population is conceptual as it is a hypothetical group of yield values that could potentially be observed or measured but cannot be physically touched or grasped.

b. The population in the case of a pollster sampling 1000 registered voters in a certain state and asking them which candidate they support for governor is the population of registered voters in that state. This population is tangible as it consists of actual individuals who can be physically located and contacted.

Sampling is the process of choosing a representative subset of a population for the purpose of generalizing findings about the population. In both of the above cases, sampling is used to infer about the population. Random sampling is the most common method used to select samples that are representative of the population. It is important to note that the accuracy of the sample is largely dependent on the sampling method employed, sample size, and the representativeness of the sample. In practice, a larger sample size provides a more accurate estimate of the population parameters.

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Answer:

17

Explanation:

mass number = # of protons + # of neutrons

The relationship between the ionization energy of singly charged anions and the electron affinity of the neutral atom is that the electron affinity decreases as the ionization energy decreases.

Ionization energy is the energy required to remove an electron from a gaseous atom or ion, whereas electron affinity is the energy change associated with adding an electron to a gaseous atom. The ionization energy of an atom is inversely proportional to its electron affinity, so as the ionization energy of an element decreases, its electron affinity also decreases.

Singly charged anions are found in group 7A, also known as the halogens. The halogens have high electron affinities and high ionization energies due to their valence electron configuration, which makes them highly reactive. As you go down the halogen group, both the electron affinity and ionization energy decrease, making the elements less reactive.

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Answer:

C

Explanation:

In thermodynamics, a exothermic system looses heat to the surroundings while an endothermic system absorbs heat from the surroundings.

A system is a part the universe marked off by a specified boundary. The contents of the cup constitutes the system in this case.

The region of space outside the system is called the surroundings. Hence everything outside the cup constitutes the surroundings.

The correct option is option A. when the students check the air pressure of bicycle tires, once by keeping it out in the winter and noticing the air pressure being decreased and after by keeping the bicycle inside at room temperature and noticing that the air pressure has increased.

According to Gay lussac's law, the temperature and pressure of a gas are directly proportional to each other, provided the volume is constant.

When the temperature of a gas is increased, the molecules gain more kinetic energy and hence the frequency of them hitting the walls of the container increases which basically implies that the pressure increases.

On the other hand when the temperature is low, the molecules do not have substantial kinetic energy to hit the walls of the container frequently, that is the pressure decreases.

When the bicycle tires were kept out in the winter, the low temperature decreased the air pressure inside the tires. While when they were warmed at room temperature, the pressure inside the tires increased.

Therefore, the correct option is option A.  when the students check the air pressure of bicycle tires, once by keeping it out in the winter and noticing the air pressure being decreased and after by keeping the bicycle inside at room temperature and noticing that the air pressure has increased.

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Among the given examples glass is an example of amorphous solid which is not a slow moving liquid. Hence, the correct choice is glass.

Amorphous solid is defined as any non - crystalline solid in which the atoms and molecules are not organized in a definite lattice pattern. Such solids are known as amorphous solids which includes glass, plastic, and gel.

Basically glass is not a slow-moving liquid. It is defined as a solid, albeit an odd one. It is generally called an amorphous solid because it lacks in the ordered molecular structure of true solids, and yet its irregular structure is too rigid for it to qualify as a liquid. Hence, the correct option is A.

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Answer:

An organism is made up of four levels of organization: cells, tissues, organs, and organ systems. These levels reduce complex anatomical structures into groups; this organization makes the components easier to understand

Explanation: