Igneous rocks formed below earths surface
A) igneous rocks
B) extrusive
C) intrusive
D) lava

Answer:

protons and neutrons

Explanation:

its on the assighnment

Protons and neutrons subatomic particles are primarily responsible for giving an atom its mass .

A proton is a positively charged particle that lies in the atomic nucleus .

The number of protons in the atomic nucleus is what determines the atomic number of an element .

It has a mass of  mass of 1.67262 × 10⁻²⁷ kg

An electron is a negatively charged particle  of an atom.

Electrons exist outside of  the atom nucleus. Each electron carries one unit of negative charge -1.602 x 10⁻¹⁹ coulomb .

Hence , protons and neutrons subatomic particles are primarily responsible for giving an atom its mass .

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Answer:

[tex]1mole=6.02x10^{23} unit[/tex] (Avogadro constant)

Explanation:

It is known by the name of mole (mol) to one of the fundamental physical magnitudes that contemplate the International System of Units. This unit is used to measure the quantity of all kinds of substances present in a given system.

The mole, experts say, reflects the amount of substance that has a specific number of entities of elementary character as atoms can be found in twelve grams of carbon-12. This means that the number of elementary units (as in the case of atoms, molecules or ions, for example) that are reflected in a mole of substance is a constant that has no direct relationship with the type of particle or material in question. This amount is known as Avogadro's number.

This constant, baptized in homage to the scientist of Italian origin Amedeo Avogadro (1776-1856), allows to count microscopic particles from macroscopic measurements (as it is the case of the mass).

In chemistry, a mole consists of exactly 6.022 × 10²³ particles, which can be atoms, molecules, ions, or electrons. This quantity is known as Avogadro's number. Option A is correct.

The number of particles in a mole is a fundamental concept in chemistry, directly associated with the Avogadro's number. One mole of any substance, be it atoms, molecules, ions, or electrons, contains exactly 6.022 × 10²³ of those particles.

This specific value is selected for its utility in linking the macroscopic measurements that scientists can easily work with, to the microscopic scale of atoms and molecules which are too small to interact with directly.

This value (6.022 × 10²³) also represents the bridge between the molecular scale and the scale of chemical reactions observable and measurable in the laboratory. It's because every mole of substance, due to this number, will have a mass in grams equal to its molecular (or atomic) mass which is a direct translation of microscopic properties to macroscopic quantities that can be measured.

Hence, A. is the correct option.

The complete question is:

How many particles are in a mole?

A. 6.02 × 10²³

B. 23 × 10⁶

C. 6.02 × 23¹⁰

Answer:

The right choice is "HNO₃ + KOH → KNO₃ + H₂O​"

Explanation:

acid-base neutralization reaction is a reaction in which acid react with base to form salt and water.

This is a reaction between metal (Sn) and acid (HF)

    2. C₂H₄ + 3 O₂ → 2 CO₂ + H₂O

This is a combustion reaction

    3. MgCl₂ + Ca(OH)₂  →  Mg(OH)₂ + CaCl₂

This is a simple displacement reaction between salt (MgCl₂) and base (Ca(OH)₂).

    3. HNO₃ + KOH → KNO₃ + H₂O

This is a acid-base neutralization reaction in which acid (HNO₃) react with base (KOH) to form salt (KNO₃) and water (H₂O).

So, the right choice is "HNO₃ + KOH → KNO₃ + H₂O​"

Answer:

A chemical equation that is balanced will help you to determine how much product they will produce from their reactants.

Hope this helps :)

Have a great day !

5INGH

Explanation:

Answer:

-1268 kJ

Explanation:

The molar enthalpy of combustion of C6H6 is -3170 kJ/mol

2C6H6(g) + 15O2(g) → 12CO2(g) + 6H2O(g)

Therefore;

when 1 mole of C6H6 undergoes combustion, an energy of -3170 kJ/mol is released.

Therefore; for 0.40 mole

= 0.4 × -3170 kJ

= -1268 kJ

Answer:

The guy above me is correct, but the next answers are -67.68 and exothermic

Explanation: edge

Answer:

Like a jungle with trees everywhere

Hope This Helps!   Have A Nice Day!!

I would suggest reading Genesis chapter 1 to 2. It'll explain it all.

Answer:

I. Kindly, see the attached image.

II. The reaction is exothermic.

III. - 51.88 kJ/mol.

IV. The reaction is spontaneous.

Explanation:

I. Draw a possible potential energy diagram of the reaction. Label the enthalpy of the reaction.

In an exothermic reaction, the energy of the reactants is higher than that of the products.

Kindly see the attached image to show you the potential energy diagram of the reaction.

II. Is the reaction endothermic or exothermic? Explain your answer.

If the sign is positive, the reaction is endothermic.

If the sign is negative, the reaction is exothermic.

Herein, ΔH = - 33.1 kJ/mol, so the reaction is exothermic.

III. What is the Gibbs free energy of the reaction at 25°C?

∵ ΔG = ΔH - TΔS.

Where, ΔG is the Gibbs free energy change (J/mol).

ΔH is the enthalpy change (ΔH = - 33.1 kJ/mol).

T is the temperature (T = 25°C + 273 = 298 K).

ΔS is the entorpy change (ΔS = 63.02 J/mol.K = 0.06302 J/mol.K).

∴ ΔG = ΔH - TΔS = (- 33.1 kJ/mol) - (298 K)(0.06302 J/mol.K) = - 51.88 kJ/mol.

IV. Is the reaction spontaneous or nonspontaneous at 25°C?

The sign of ΔG indicates the spontaneity of the reaction:

If ΔG < 0, the reaction is spontaneous.

If ΔG = 0, the reaction is at equilibrium.

If ΔG > 0, the reaction is nonspontaneous.

Herein, ΔG = - 51.88 kJ/mol, so the reaction is spontaneous.

The reaction NO2(g) → N2(g) + O2(g) is exothermic as indicated by the negative ΔH. The Gibbs free energy (ΔG) at 25°C is calculated to be -51.9996 kJ/mol, which signifies that the reaction is spontaneous at this temperature.

For the reaction NO2(g) → N2(g) + O2(g), with ΔH = –33.1 kJ/mol and ΔS = 63.02 J/(mol·K):

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Answer:

oxygen

Explanation:

?

Answer:

1. C. Chemical bond

2. A. Chemical reaction

3. Product

4. C. Balanced

5. B. Atoms of the same kind are of equal number on either side of the arrow

Explanation:

A chemical bond is a bond between two or more atoms. There are different types of chemical bonds, but the one that the question is pertaining to is called a covalen bond. A covalent bond occurs when the atoms are sharing electrons.

2. A chemical reaction is characterized by the production of light and/or heat, and a change in color in the product. By definition, it is the process where one or more substances react to produce one or more products.

3. When one or more reactants react with each other, it creates another substance or substances called products. In the case of your question, sodium  reacts with chlorine (these are your reactants), which produces the product sodium chloride, which is a compound.

4. By definition, a balanced equation is an equation where the number of atoms of each element in the reactants are equal to the number of atoms of each element in the product.

ex.

Reactants        Product

Na + Cl      →      NaCl

Na = 1                Na = 1

Cl = 1                 Cl = 1

5. As explained above and shown, you can see that the number of atoms of each element in the reactants is equal to the number of each element in the product. So this means that the equation is balanced.

Answer:

1chemical bond 2chemical reaction 3 reaction 4 atomic 5atoms of the same kind ate not of equal number on either side of the arrow

Answer:

You would expect their DNA to be more similar.

Explanation:

You would expect this because they're more closely related and have had fewer time for mutations to occur.

DNA of two closely related organisms would be more similar, while DNA of two distantly related organisms would be less similar.

When you compare the DNA of two closely related organisms, you would expect their DNA to be more similar. Closely related organisms share a recent common ancestor, which means they have had less time for genetic differences to accumulate. As a result, their DNA sequences are more likely to be similar. On the other hand, when you compare the DNA of two distantly related organisms, you would expect their DNA to be less similar. Distantly related organisms have had more time for genetic differences to accumulate, resulting in more differences in their DNA sequences.

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The molar mass of Aluminium Chlorate is 277.3351

The molar mass of Aluminium Chlorate is 277.3351.

The molar mass of Aluminium Chlorate is 277.3351.

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After trapping its prey, the plant turns into a external stomach, sealing the trap so no air gets in or out. The digestion takes several days depending the size of the insect, and then the leaf re-opens.

Answer:

64.15 mL.

Explanation:

where, P is the pressure of the gas in atm.

V is the volume of the gas in L.

n is the no. of moles of the gas in mol.

R is the general gas constant,

T is the temperature of the gas in K.

V₁T₂ = V₂T₁

V₁ = 65.0 mL, T₁ = 92.4°C + 273 = 365.4 K.

V₂ = ??? mL, T₂ = 87.6°C + 273 = 360.6 K.

∴ V₂ = V₁T₂/T₁ = (65.0 mL)(360.6 K)/(365.4 K) = 64.15 mL.

Answer: Capillary walls main function is to exchange materials between the blood and tissue cells, While Arteries carry blood away from the heart to parts of your body like your lungs for instance, and your Veins carry blood back to your heart.

I hope this helps :)

Explanation:

Answer:

12.11.

Explanation:

∵ pOH = - log[OH⁻]

∴ pOH = - log(1.3 x 10⁻²) = 1.886.

∵ pH + pOH = 14.

∴ pH = 14 - pOH = 14 - 1.886 = 12.11.

Answer:

there are no graphs

Explanation:

Answer:

The graph has to switch into the values.

Explanation:

So if you're asked to graph a function and its inverse, all you have to do is graph the function and then switch all x and y values in each point to graph the inverse. Just look at all those values switching places from the f(x) function to its inverse g(x) (and back again), reflected over the line y = x.

The volume (in mL) required to make 1 L of the solution is 200 mL

M₁V₁ = M₂V₂

2 × V₁ = 0.4 × 1000

2 × V₁ = 400

Divide both side by 2

V₁ = 400 / 2

V₁ = 200 mL

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Final answer:

To prepare 1 liter of a 0.400 M NaCl solution from a 2.00 M NaCl solution, you need 200 milliliters of the 2.00 M solution, calculated using the dilution formula M1V1 = M2V2.

Explanation:

To determine how many milliliters of a 2.00 M NaCl solution are required to make 1 liter of a 0.400 M NaCl solution, we can use the dilution formula M1V1 = M2V2, where M1 is the molarity of the initial solution, V1 is the volume of the initial solution, M2 is the molarity of the final solution, and V2 is the volume of the final solution

In this case, we have:

M1 = 2.00 M (initial molarity of NaCl)

M2 = 0.400 M (desired molarity of NaCl)

V2 = 1 liter = 1000 mL (desired volume of final solution)

To find V1, we rearrange the equation: V1 = (M2 × V2) / M1.

Substituting in the known values, we get: V1 = (0.400 M × 1000 mL) / 2.00 M = 200 mL.

So, you would need 200 milliliters of the 2.00 M NaCl solution to prepare 1 liter of a 0.400 M NaCl solution.

Answer:

Radioactive decay occurs in unstable atomic nuclei – that is, ones that don't have enough binding energy to hold the nucleus together due to an excess of either protons or neutrons.

Hope this helps!

Answer:

It happens when a heavy nucleus is bombarded with neutrons, so it becomes unstable and decomposes into two nuclei.

Explanation:

This is known by the term nuclear fission, which is a reaction by which a heavy nucleus, when bombarded with neutrons, becomes unstable and divides into two nuclei, of sizes of the same order of magnitude, there is a high release of energy and emits two or three neutrons. These neutrons can lead to more fissions by interacting with other fissile nuclei.

Answer:

mole fraction of NaCl = 0.03145.

mole fraction of water = 0.9686.

Explanation:

mole fraction of NaCl = (no. of moles of NaCl) / (total no. of moles).

no. of moles of NaCl = mass/molar mass = (6.87 g)/(58.44 g/mol) = 0.1176 mol.

no. of moles of water = mass/molar mass = (65.2 g)/(18.0 g/mol) = 3.622 mol.

∴ mole fraction of NaCl = (no. of moles of NaCl) / (total no. of moles) = (0.1176 mol)/(0.1176 mol + 3.622 mol) = 0.03145.

∵ mole fraction of NaCl + mole fraction of water = 1.0.

∴ mole fraction of water = 1.0 - mole fraction of NaCl = 1.0 - 0.03145 = 0.9686.

Answer:

The solution is basic.

Explanation:

We can determine the nature of the solution via determining which has the large no. of millimoles (acid or base):

no. of millimoles of acid (HNO₃) = MV = (1.3 M)(75.0 mL) = 97.5 mmol.

no. of millimoles of base (NaOH) = MV = (6.5 M)(150.0 mL) = 975.0 mmol.

∴ The no. of millimoles of base (NaOH) is larger by 10 times than the acid (HNO₃).

So, the solution is: basic.

Answer:

1246 mg = 1.246 g.

Explanation:

Where, k is the rate constant of the reaction.

t1/2 is the half-life time of the reaction (t1/2 = 10.6 minutes).

∴ k = ln2/(t1/2) = 0.693/10.6 = 6.54 x 10⁻² min⁻¹.

where, k is the rate constant of the reaction (k = 6.54 x 10⁻² min⁻¹.).

t is the time of the reaction (t = 1.25 hr x 60 = 75.0 min).

a is the initial concentration (original amount) (a = ??? mg).

(a-x) is the remaining concentration (a-x = 9.25 mg).

∴ kt = lna/(a-x)

(6.54 x 10⁻² min⁻¹)(75.0 min) = ln a/(9.25 mg)

4.903 =  ln a/(9.25 mg)

Taking e for the both sides:

134.7 = a/(9.25 mg)

∴ a = (134.7)(9.25 mg) = 1246 mg = 1.246 g.

Answer:

24.5%

Explanation:

You just add up the atomic masses.  

Ca - 40.078  

Cl2 - 35.4527 x 2 = 70.9054  

------ 110.9834  

H4 - 1.00794 x 4 = 4.03176  

O2 - 31.9998  

------ 36.03056  

TOTAL - 147.01396  

So the water is 36.03056/147.01396 = .245082576 but that is only accurate to three decimals (because the mass of Ca was only given to three decimals) so we write .245 and that is 24.5%

This is not my answer but I found it on Yahoo answers and it was answered by Anonymous.

Answer: 24.5%

Explanation: Molar mass of CaCl2 * 2 H2O = 40.078 + ( 2 x 35.453) + ( 2 x 18.02)=147.024 g/mol  

% H2O = 2 x 18.02 x 100/ 147.024 =24.5

Answer:Five grams of sugar is mixed with 300 mL of water. In the solution, water would be classified as the —

solvent

Explanation:

It is the solvent because it can dissolve the sugar.

Solvent- able to dissolve other substances.

The sugar has been dissolved in the water, sugar has been considered as solute. The water has been dissolving sugar in itself so it has been considered as solvent.

Since sugar has been dissolved in the water, sugar has been considered as solute. The water has been dissolving sugar in itself so it has been considered as solvent.

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Answer:

1. to bend ==>  refract

2. not allowing light to pass through   ==>  opaque

3. only partially clear ==> translucent  

4. clear  ==>  transparent

Explanation:

1. to bend ==>  refract

When a substance (like water) or a surface (like a mirror) changes the direction of the light, it refracts it.

2. not allowing light to pass through   ==>  opaque

Usually a solid but also a thick/dark liquid can be an opaque barrier preventing the passage of light.

3. only partially clear ==> translucent  

Think about a white plastic or a film-coated glass pane, they will let you see there's light on the other side, but not letting it pass through completely.

4. clear  ==>  transparent

Think like a window or a anything similar that allows the light to pass through without any significant obstruction.

Answer:

1. to bend ==>  refract

2. not allowing light to pass through   ==>  opaque

3. only partially clear ==> translucent  

4. clear  ==>  transparent

Explanation:

Answer:

These examples could be written as chemical reactions, but are more generally considered to be endothermic or heat-absorbing processes: Melting ice cubes. Melting solid salts. ... Converting frost to water vapor (melting, boiling, and evaporation, in general, are endothermic processes.

Explanation:

We have that an example of an endothermic reaction is given as

From the question we are told

Which reaction is an example of an endothermic reaction?

Generally an endothermic reaction is a reaction where heat energy is absorb from the air in to a system.

Generally it cause a reduction in the temperature of a system and can be found in processes like

Therefore

An example of an endothermic reaction is given as

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Answer:

Thermal decomposition reaction.

Explanation:

Solid mercury(II) oxide is decomposed with heating into liquid mercury and oxygen gas. This reaction takes place at a 600-700°C.

The balanced chemical reaction is:

2HgO  →  2Hg  +  O₂.

Considering the definition of decomposition reaction, the reaction HgO → Hg + O₂ is a thermal decomposition reaction.

A single substance decomposes through a reaction called decomposition, producing two or more diferent compounds. That is, in this type of reaction two or more compounds are formed from a compound.

The atoms that make up a compound are separated to give the products according to the formula:

AB → A + B

This type of reaction can occur spontaneously or caused by certain external factors, such as heat. So, there are 3 types of decomposition reactions:

The reaction HgO → Hg + O₂ is a thermal decomposition reaction where mercuric oxide (HgO) decomposes on heating to give mercury (Hg) and oxygen (O₂​).

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The answer should be 3 moles of Carbon.

To convert the number of atoms of carbon to moles, divide the given number of atoms by Avogadro's number, which is 6.022 × 10^23 particles per mole. In this case, there are approximately 3 moles of carbon.

To find the number of moles of carbon from the given number of atoms, we can use Avogadro's number. Avogadro's number is defined as 6.022 × 1023 particles per mole.

So, to convert the number of atoms of carbon to moles, we divide the given number of atoms by Avogadro's number:

Number of moles of carbon = (Number of atoms of carbon) / (Avogadro's number)

Plugging in the given values, we have:

Number of moles of carbon = (1.806 × 1024 atoms of carbon) / (6.022 × 1023 atoms/mol) ≈ 3 moles of carbon

Answer:

63.86 mg

Explanation:

Molar mass is the mass of 1 mol of compound / atom.

molar mass of the compound is - 310 g/mol

mass of 1 mol is - 310 g

therefore mass of 2.06 x 10⁻⁴ mol is - 310 g/mol x 2.06 x 10⁻⁴ mol = 0.06386 g

mass of calcium phosphate is - 63.86 mg

Final answer:

To find the mass of 2.06 x 10⁻⁴ moles of calcium phosphate (Ca₃(PO₄)₂), calculate the formula mass using atomic masses of calcium, phosphorus, and oxygen. The formula mass of calcium phosphate is 310.18 g/mol. Multiplying this by the moles gives you 0.0639 grams of calcium phosphate.

Explanation:

To calculate the mass in grams of 2.06 x 10⁻⁴ moles of calcium phosphate (Ca₃(PO₄)₂), you must know the formula mass of calcium phosphate. The empirical formula indicates the compound contains three calcium ions (Ca⁺²) and two phosphate ions (PO₄⁻³). The formula mass is calculated by adding together the atomic masses of the constituent atoms: three calcium atoms, two phosphorus atoms, and eight oxygen atoms.

The atomic masses are approximately 40.08 g/mol for calcium, 30.97 g/mol for phosphorus, and 16.00 g/mol for oxygen. Calculating the formula mass, we have:

3(Calcium) + 2(Phosphorus) + 8(Oxygen) = 3(40.08 g/mol) + 2(30.97 g/mol) + 8(16.00 g/mol) = 310.18 g/mol

Now, to find the mass of 2.06 x 10-4 moles of calcium phosphate:

2.06 x 10⁻⁴ moles x 310.18 g/mol = 0.0639 grams

Therefore, there are 0.0639 grams of calcium phosphate in 2.06 x 10⁻⁴ moles of the compound.

Answer:

2.317 kg

Explanation:

Density = mass / vol

Vol = 10 x4 x 3 =120

Density=19.3 gm/cm3

Mass= density x vol =2316 gm or 2.317 kg

Answer: The mass of gold is 2316 grams.

Explanation:

To calculate the volume of cuboid, we use the equation:

[tex]V=lbh[/tex]

where,

V = volume of cuboid

l = length of cuboid = 10 cm

b = breadth of cuboid = 4 cm

h = height of cuboid = 3 cm

Putting values in above equation, we get:

[tex]V=10\times 4\times 3=120cm^3[/tex]

To calculate mass of a substance, we use the equation:

[tex]Density=\frac{Mass}{Volume}[/tex]

Putting values in above equation, we get:

[tex]19.3g/cm^3=\frac{\text{Mass of Gold}}{120cm^3}\\\\\text{Mass of osmium}=2316g[/tex]

Hence, the mass of gold is 2316 grams.

Answer:

they start to decompose

Explanation:

the easiest way to wxplain this is that all organic matter decomposees and turns into nutrients for other organisms, its a cycle. but after an organism dies then it starts to decompose and rot.

Answer:

they begin to rot

Explanation: