Which answer below correctly identifies the type of change and the explination for the boiling of water

A bigger atom  fission when a neutron smashes against it, causing it to excite and split into two smaller atoms known as fission products. A chain reaction may be initiated by other neutrons that are also released.

By dissolving large, heavy atoms, like uranium, into smaller ones, like iodine, cesium, strontium, xenon, and barium, to name just a few, fission produces energy. To create the heavier helium, fusion combines light atoms, such as the two hydrogen isotopes deuterium and tritium.

Nuclear fission fuels the explosion of nuclear weapons and creates energy for nuclear power. Due to the fact that certain compounds known as nuclear fuels undergo fission when impacted by fission neutrons and then break apart, both uses are feasible.

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Answer: Have a nice dAy?

Explanation: I thought i knew but nvm sorry

Answer:

the answer is B:) have a good day

Answer:

Explanation:

Interesting question - especially if you are afflicted by something like Leukemia where it pays to know everything you can about Hemoglobin.

Molecules

1 mole of anything has 6.02 * 10^23 in this case molecules

6.4*10^-3 moles has x number of molecules

Set up the proportion

1/6.4*10^-3   =  6.02 * 10^23 molecule / x          Cross Multiply

x = 6.4*10^-3 * 6.02 * 10^23

x = 3.853*10^21 molecules

Mass Hemoglobin

1 mol of hemoglobin is 64456 grams

6.4*10^-3 moles = x grams                                  Cross multiply

x = 64456 * 6.4*10^-3

x = 412.5 grams of hemoglobin in this woman's body.

If you are American and think in pounds, then this is roughly a pound of hemoglobin.

Considering that you need hemoglobin to carry oxygen around to various organs, it is not an awful lot. That's the miracle of the human body.

The percent by mass of the lithium in the compound is 18.78%. Option C

We know that the percentage has to do with the amount of the element that can be found in the compound. We can be able to obtain this when we  find the molar mass of the compound and then obtain the mass of the element in the compound.

Hence;

Molar mass of the compound = [2(7) + 12 + 3(16)]

= 14 + 12 + 48

= 74 g/mol

The we have the mass of the lithium in the compound as 14

Thus we then have;

Percent of lithium = 14/74 * 100/1

= 18.78%

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pH = 1.92, acidic

pH = 8.24, basic

pH = 11.41, basic

pH = 4.34, acidic

To calculate the pH of a solution, we use the formula:

pH = -log[H+]

where [H+] is the concentration of hydrogen ions in moles per liter.

For [H+] = 1.2 x 10^-2 M:

pH = -log(1.2 x 10^-2) = 1.92

This solution is acidic.

For [H+] = 5.8 x 10^-9 M:

pH = -log(5.8 x 10^-9) = 8.24

This solution is basic.

For [H+] = 3.92 x 10^-12 M:

pH = -log(3.92 x 10^-12) = 11.41

This solution is basic.

For [H+] = 4.52 x 10^-5 M:

pH = -log(4.52 x 10^-5) = 4.34

This solution is acidic.

So, the pH and nature of the solutions are:

pH = 1.92, acidic

pH = 8.24, basic

pH = 11.41, basic

pH = 4.34, acidic

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Answer:

Explanation:

Which of the following is most likely to be ductile?

a. Metal
b. Nonmetal
c. Metalloid
d. Gas

Answer: a. MetalMetal

This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97. The incorrect representation for a neutral atom is 36Li

To determine the correct representation for a neutral atom, we need to consider the atomic number (Z) and mass number (A) of the element. The atomic number represents the number of protons in the nucleus, while the mass number represents the sum of protons and neutrons.

Let's analyze the given representations:

36Li:

This representation suggests that the element is lithium (Li) with a mass number of 36, which is incorrect. The correct mass number for lithium is approximately 6.94.

613C:

This representation suggests that the element is carbon (C) with a mass number of 13, which is correct. Carbon has different isotopes, and 13C represents one of its stable isotopes.

3063Cu:

This representation suggests that the element is copper (Cu) with a mass number of 63, which is correct. Copper has different isotopes, and 63Cu represents one of its stable isotopes.

1530P:

This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97.

Therefore, the incorrect representation for a neutral atom is 36Li, as it does not match the known properties of lithium.

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Answer:frh

Explanation:

The attached graphic displays the enthalpy diagram for the combustion of cyclopropane.

The enthalpy diagram for a combustion reaction typically displays the change in reaction enthalpy (H) throughout the reaction route.

An enthalpy diagram normally has two sides: the reactant side and the product side. Reactant species like gasoline or hydrocarbons have a higher enthalpy on the reactant side when compared to the products. As the reaction gets nearer to the products, the enthalpy decreases.

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The name of the given alkene is 2-methyl-1-propene. The correct option is A.

Alkenes are inorganic compounds. They are the series of hydrocarbons, that are formed by carbon-carbon double bonds. To find out alkenes, you have to see that the number of hydrogen atoms is always double the number of carbons.

Propene is an unsaturated compound, which is the second-simplest compound, and it contains a single double bond, and it is a colorless gas and has a texture of petroleum jelly.

CH₃C = CH₂

I

CH₃

Here, the three CH₃ are shown in the diagram, so it will be the methyl because it contains 3 CH₂, and now see the propene means one double bond and four carbon atoms. So it will be the 2-methyl-1-propene.

Thus, the correct option is A. 2-methyl-1-propene.

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The carrying capacity of the area was reduced in the year 10 according to the graph that shows the number of foxes on the island over a span of 15 years.

The graph shows a population of foxes over a span of 15 years. The y-axis represents the number of foxes on the island, while the x-axis represents time. The study began with the earlier 0 and ran until the start of year 15. According to the graph, the carrying capacity of the area was reduced in the year 10.

In the graph, it is shown that the population of foxes on Sunday Gill island had a significant increase from year 0 to year 3. After year 3, the fox population started to decrease and then remained fairly constant until year 10. After year 10, the population of foxes on the island started to decline more rapidly until the end of the study in year 15

This decline in the population of foxes on the island is most likely due to the reduction in carrying capacity of the area. Carrying capacity refers to the maximum number of individuals that an environment can sustain. When the carrying capacity of an environment is reached, it means that the environment can no longer provide the necessary resources to sustain the population.  

There are various factors that can cause a reduction in carrying capacity, such as environmental degradation, competition for resources, or a natural disaster. In this case, it is not clear what caused the reduction in carrying capacity in year 10, but it is likely that it was due to some environmental factor that impacted the availability of resources for the fox population.
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Answer:

A catalyst remains unchanged during a chemical reaction, as it does not actively participate in the reaction but it acts by reducing the activation energy necessary for the reaction occur.

Explanation:

The question requires us to determine what happens to a catalyst during a chemical reaction.

A catalyst is a substance that is added to a chemical reaction with the purpose of increasing the rate of the reaction. The catalyst does not get used up or created during the reaction; instead, it remains unchanged as it does not participate directly in the chemical reaction.

A catalyst is able to increase the rate of the reaction by reducing the activation energy necessary for the reaction to happen. This happens because the catalyst changes the way that the reaction happens (the mechanism of the reaction), usually by forming an intermediate state with the reactants and being completely released from this intermediate at the end of the reaction.

You would recover 36.525g of NaCl after evaporating all of the water.

To find the grams of NaCl that would be recovered after evaporating all the water, we can use the following formula:

mass = moles * molar mass

Where:

Moles = Molarity * Volume

Molarity = 0.250 M

Volume = 2500.0 mL = 2.5 L

Molar mass of NaCl = 58.44 g/mol

mass = 0.250 M * 2.5 L * 58.44 g/mol

mass = 36.525 g

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Answer:

its sodium hydroxide

Explanation:

Answer:

you will add then subtract to get the answer

The example given is the descriptive science.

The practice of observing, documenting, describing, and categorizing phenomena falls under the category of descriptive science. Hypothesis-driven research, which is concerned with using experimentation to test a specific hypothesis, is sometimes contrasted with descriptive research.

The goal of descriptive sciences is to identify, analyze, and document the measurable realities in our environment. They are disciplines like chemistry or physics that base their methodology on experiments.

While hypothesis-based science, which is typically deductive, starts with a specific question or problem and a potential answer or solution that can be tested, descriptive (or discovery) science, which is typically inductive, aims to observe, explore, and discover.

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Answer:

4.62 atm

Explanation:

To find the missing pressure, you need to use the Combined Gas Law equation:

P₁V₁ / T₁ = P₂V₂ / T₂

In this equation, "P₁", "V₁", and "T₁" represent the initial pressure, volume, and temperature. "P₂", "V₂", and "T₂" represent the final pressure, volume, and temperature.

P₁ = 8.01 atm                      P₁ = ? atm

V₁ = 715 mL                        V₁ = 963 mL

T₁ = 67 °C                           T₁ = 52 °C

P₁V₁ / T₁ = P₂V₂ / T₂

(8.01 atm)(715 mL) / 67 °C = P₂(963 mL) / 52 °C

85.47985 = P₂(963 mL) / 52 °C

4444.952 = P₂(936 mL)

4.62 atm = P₂

The coordinates of the midpoint : (-1,-2.5)

Given

The coordinates of (3,-7) and (-5, 2)

Required

Midpoint

Solution

Can be formulated :

\(\tt midpoint=\dfrac{x_1+x_2}{2},\dfrac{y_1+y_2}{2}\)

Input the value :

x₁=3

x₂=-5

y₁=-7

y₂=2

\(\tt midpoint=(\dfrac{3+(-5)}{2},\dfrac{-7+2}{2})\\\\midpoint=(\dfrac{-2}{2},\dfrac{-5}{2})\\\\midpoint=(-1,-2.5)\)

The molar solubility of CdF₂ in pure water is 0.0585M, and adding NaF decreases this solubility because the equilibrium shifts to favor the precipitation of some CdF₂. The correct option is A.

According to the statement, the option that identifies the molar solubility of CdF₂ in pure water and explains the effect that the addition of NaF has on this solubility is [CdF₂]eq = [Cd₂+]eq = 0.0585 M (since the solubility product expression for CdF₂ gives Ksp = [Cd₂+][F-]², and F- is in excess).

The molar solubility of CdF₂ in pure water can be determined by calculating the concentration of Cd₂+ and F− ions in the saturated solution, and then using the stoichiometry of the equilibrium reaction to determine the concentration of CdF₂ that would dissolve in pure water.

From the equilibrium equation: CdF₂(s) ⇄ Cd₂+(aq) + 2F−(aq), we know that for every mole of CdF₂ that dissolves, 1 mole of Cd₂+ and 2 moles of F− ions are produced.

The effect of adding NaF to the saturated solution can be explained by the common ion effect. When NaF is added, it provides additional F− ions, which are already present in the saturated solution, and thus increases the concentration of the common ion.

This leads to a shift in the equilibrium to the left, causing more CdF₂ to precipitate out of solution until a new equilibrium is established. As a result, the molar solubility of CdF₂ in the solution decreases.

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Complete question:

CdF₂(s)⇄Cd₂+(aq)+2F−(aq) A saturated aqueous solution of CdF₂ is prepared. The equilibrium in the solution is represented above. In the solution, [Cd₂+]eq=0.0585M and [F−]eq=0.117M. Some 0.90MNaF is added to the saturated solution. Which of the following identifies the molar solubility of CdF₂ in pure water and explains the effect that the addition of NaF has on this solubility?

a. The molar solubility of CdF₂ in pure water is 0.0585M, and adding NaF decreases this solubility because the equilibrium shifts to favor the precipitation of some CdF₂.

b. The molar solubility of CdF₂ in pure water is 0.0585M, and adding NaF has no effect on the solubility because only changes in temperature can increase or decrease the molar solubility of an ionic solid.

c.The molar solubility of CdF₂ in pure water is 0.117M, and adding NaF decreases this solubility because the equilibrium shifts to favor the precipitation of some CdF₂.

d. The molar solubility of CdF₂ in pure water is 0.176M, and adding NaF increases this solubility because the Na+ ions displace the Cd₂+ ions, causing the equilibrium to shift to favor the products.

Cations are formed through lose of electrons and thus, possess positive charge. Cations has smaller ionic radius than the neutral atom, because, they have are fewer  electrons and thus experience more nuclear attractive pull.

Cations are charged particles or ions formed by the lose of electrons from the neutral atom. Atoms acquires positive charge when they lose electrons and acquire negative charge by gaining electrons  and the negative ions are called anions.

For example, Na metal loses one electrons to form the cation Na+. Similarly Mg loses two electrons, to form Mg²⁺  ion. When these atoms loses electrons, the outermost shell can be emptied and the atomic radius shrinks to the penultimate shell.

Similarly, as the number of electrons reduces, the screening of electron from neighboring electrons reduces results in greater nuclear attractive pull and thereby the atomic radius shrinks to smaller than the neutral atom.

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Answer:

The volume of the flask is 20.245 litres .

Explanation:

We are given with following information-

\(PV=nRT\) -------- 1

where R =\(0.0821L.atom/mole.K\)

Molar mass of \(PCl_5=208.22g/mole\)

The given chemical equation is -

\(2P _(_s_)+5Cl_2 _(_g_)\rightarrow2PCl_5 _(_s_)\) --------- 2

Now , calculation -

Mass of \(PCl_5\) formed = 118g

Molar mass of \(PCl_5\) = \(208.22g/mole\)

      Mole = \(\frac{mass (g)}{molar mass}\)

Therefore , moles of \(PCl_5\) formed = \(\frac{118}{208.22}\)

     From equation 2 , we get to know that ,

 2mole \(PCl_5\) formed from 5 mole \(Cl_2 _(_g_)\)

Therefore , \(\frac{118}{208.22}\) mole \(PCl_5\) formed from \(\frac{5}{2} \times\frac{118}{208.22}\) mole \(Cl_2 _(_g_)\)

Moles of \(Cl_2 _(_g_)\) used =\(\frac{5\times118}{2\times208.22} mole\)

R= \(0.0821L.atom/mole.K\)

Pressure (P)= 1.85atm

Temperature (T)= 322K

Moles of  \(Cl_2 _(_g_)\) (n)= \(\frac{5}{2} \times\frac{118}{208.22}\) moles

Applying  the formula above in 1 equation , that is

PV = nRT

putting the given values -

\(1.85 \times V=\frac{5}{2} \times\frac{118}{208.22}\times0.0821\times322\)

 V = 20.245 litres.

Hence , the volume of the flask is 20.245 litres .

The enthalpy of combustion for 1kg of urea is -1223525.84 J/mol.

Urea is a compound that is used in fertilizers and in some plastics.The enthalpy of combustion for urea is the amount of energy that is released when urea is burned. In order to calculate the enthalpy of combustion for 1kg of urea, we need to use the information that is provided to us in the question. Let us start by writing down the balanced equation for the combustion of urea: CO(NH2)2 + 3/2 O2 → CO2 + 2H2O + N2
The balanced equation shows that 1 mole of urea reacts with 1.5 moles of oxygen gas to produce 1 mole of carbon dioxide, 2 moles of water, and 1 mole of nitrogen gas. The enthalpy change for this reaction is equal to the amount of energy that is released when 1 mole of urea is burned.
The heat of combustion (ΔHc) of urea is -632.6 kJ/mol. This means that 632.6 kJ of energy is released when 1 mole of urea is burned. We know that 12g of urea raised the temperature of water by 30°C. We can use this information to calculate the amount of energy that was released when 12g of urea was burned.
The specific heat capacity of water is 4.18 J/g°C. This means that it takes 4.18 J of energy to raise the temperature of 1 gram of water by 1°C. Therefore, it takes 4.18 x 1000 = 4180 J of energy to raise the temperature of 1 kg of water by 1°C.
We know that 12g of urea raised the temperature of water by 30°C. Therefore, the amount of energy that was released when 12g of urea was burned is:
Energy = mass x specific heat capacity x temperature change
Energy = 0.012 kg x 4180 J/kg°C x 30°C
Energy = 1497.6 J
We can now use this information to calculate the enthalpy of combustion for 1kg of urea:
Enthalpy of combustion = energy released / moles of urea burned
Enthalpy of combustion = 1497.6 J / (0.012 kg / 60.06 g/mol)
Enthalpy of combustion = - 1223525.84 J/mol
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Answer:

B I think I am pretty sure

The density of a sample of nitrogen gas (N₂) that exerts a pressure of 5.30 atm in a 3.50-L container at 125°C is 4.54 gm/litre

This law combines the relationships between p, V, T and mass, and gives a number to the constant.

The ideal gas law is:

pV = nRT

where n is the number of moles, and R is universal gas constant.

The value of R depends on the units involved, but is usually stated with S.I. units as: R = 8.314 J/mol·K

The values given in the question are

p= 5.30 atm , V=3.50 L

T (in Kelvin) = 125+273 K

                   = 398 K

R = 0.0821 L·atm /mol·K

The Ideal Gas equation can be re written as

pM=DRT

M is the molar mass , D is the density

M for N₂ is 28 gm/mol

so density can be determined as

\(\rm D= \dfrac{p M}{RT} \\\\\rm D= \dfrac{5.3\; \times 28}{0.082 \;\times398} \\\\\rm D =4.54 gm/litres\)

Therefore the density of a sample of nitrogen gas (N₂) that exerts a pressure of 5.30 atm in a 3.50-L container at 125°C is 4.54 gm/litre

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When answering questions on Brainly, it is important to be factually accurate, professional, and friendly. Your answer should be concise and not include extraneous amounts of detail. It is also important to avoid typos and irrelevant parts of the question.

For the given question, the AM station KBOR plays music from the 20s and 30s at a frequency of 1290 kHz. The question asks to find the wavelength of these waves.

To find the wavelength of a wave, we can use the formula:

wavelength = speed of light / frequency

The speed of light is a constant value of approximately 3 x 10^8 m/s. We can convert the frequency to Hz by multiplying by 1000, giving us a frequency of 1.29 x 10^6 Hz.

Substituting these values into the formula, we get:

wavelength = 3 x 10^8 m/s / 1.29 x 10^6 Hz

Simplifying this expression, we get:

wavelength = 232.56 m

Therefore, the wavelength of the waves played by AM station KBOR is approximately 232 meters. The correct answer is A) 232 m.

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Answer:

swim alot ig and do what they said up there

Based on the Law of Conservation of Mass, the mass of products form when baking soda decomposes is 168 g/mole.

The law of conservation of mass or principle of mass conservation states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as the system's mass cannot change, so quantity can neither be added nor be removed.

From the equation of NaHCO3 → Na₂CO3 + H₂O + CO₂ , we have

Mass of baking soda = 2 x molar mass

Molar mass of NaHCO₃ = 84.007 g/mole

Mass of baking soda = 2 x 84.007 g/mole

Mass of baking soda =  168.014 g/mole=  168 g/mole

Therefore, based on the Law of Conservation of Mass, the mass of products form when baking soda decomposes is 168 g/mole.

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