The heat inside Earth comes from ____________.
A) impacts around 4.5 billion years ago B) the sun
C) the moon D) volcanoes

As provided in the question, the pH of a solution is equal to the negative logarithm of the H₃O⁺ concentration in the solution (the square brackets denote the molar concentration).

We are given a solution with an H₃O⁺ concentration of 5.6 × 10⁻⁹ M. So, the pH of this solution would be:

pH = -log[H₃O⁺] = -log(5.6 × 10⁻⁹ M) = 8.25.

A pH that is equal to 7 is neutral; less than 7, acidic; and greater than 7, basic. As 8.25 is greater than 7, this solution is basic.

Answer:

237.5 grams CaCl2

Explanation:

Use the periodic table to calculate the mass of CaCl2

40.078+(35.45*2)=110.97800

Convert: 2.14 mol CaCl2 * 110.98g CaCl2/1 mol CaCl2 = 237.4972 g

Answer:

I'm not sure brother i'm not smart.

A student determined the heat of fusion of water to be 366.9 j/g. The percent error is 0.1%.

The discrepancy between the calculated value and the projected value is known as the percentage error. It is shown as a percentage of 100. A relative mistake times 100 is what it is.

The formula to calculate the percentage error is

[(Estimated value - Actual value)/Actual value] × 100%

The Measured value is 366.9 J/g

The actual volume is 333.3 J/g

Percent error is ?

Putting the values in the equation

[(Estimated value - Actual value)/Actual value] × 100%

[( 366.9 -  333.3)/ 333.3] × 100

0.1008 × 100 = 0.1008

Percent error = 0.1008

Thus, the percent error is 0.1%.

To learn more about percentage error, refer to the link:

brainly.com/question/4170313

#SPJ2

We can see here that the best fuel is the one that produces the most heat per unit mass. In this case, the fuel that produces the most heat per unit mass is methanol.

Fuel is a substance that is used to produce energy through combustion or other chemical reactions. It is commonly utilized to power various forms of transportation, generate heat or electricity, and operate machinery and appliances.

The results of the experiment are shown below:

Fuel            Mass (g)      Heat produced (J)       Heat per gram (J/g)

Methanol 1.0                          350                   350

Ethanol         1.0                          250                   250

Propane         1.0                          200                   200

Butane         1.0                          150                            150

Pentane         1.0                          100                            100

It is important to note that the results of this experiment are only a measure of the heat produced by the fuels.

Learn more about fuel on https://brainly.com/question/10172005

#SPJ1

Answer:

electrons

Explanation:

Of the three subatomic particles, electrons are most involved in forming chemical bonds.

When the conductivity is at a minimum, the true thing about the amount of Ba(OH)₂ is that the amount of the two reactants are the same when conductivity is low.

The ability of an aqueous solution to carry an electric current is measured by its conductivity. Ionic strength is measured by conductivity monitors. In automated chromatography systems, conductivity is the main input control parameter used to enable the generation of salt gradients or to control buffer dilution or in-line buffer preparation.

Conductivity monitors can be used to automate and monitor cleaning and equilibration procedures. It's important to remember that temperature affects measurements of conductivity and pH.

When conductivity is low, the amounts of the two reactants are equal. Between the reactants, there are no excesses. The aqueous solution cannot dissolve the precipitate BaSO₄. Since there are no ions, the conductivity is at its lowest.

Learn more about conductivity on:

https://brainly.com/question/1851658

#SPJ1

Complete question

The Ba(OH)₂ dissociates as Ba+2 + 2 OH-. H₂SO₄ dissociates as 2 H+ + SO₄-2. When the conductivity is at a minimum, what must be true about the amount of Ba(OH)₂ compared to H₂SO₄

Answer:

the answer is the last one , sorry if im wrong.

Explanation:

Answer:

The plant and animal cells are eukaryotic and contain well developed cellular organelles. 

The cell membrane, cytoplasm, chromosomes, and mitochondria are the structures that are present in both the plant and the animal cells. 

The cell wall and chloroplast are present only in the plant cell. 

Mitochondria

Because it is right next to the nucleau

Answer:

Ratio = 2 : 3 (Approx.)

Explanation:

Given:

Compound A = 1.278 g

Compound B = 1.904

Find:

Ratio

Computation:

Ratio = Compound A / Compound B

Ratio = 1.278 / 1.904

Ratio = 2 : 3 (Approx.)

A diprotic weak base (B) has pb values of 3.722 (pb1) and 6.514 (pb2). The pH at which the dissociation of the first and second proton of a diprotic weak base is equal to its pKb1 and pKb2 values respectively. The pH at which the concentration of all the three forms of the base (B, BH+ and BH22+) is equal is given by the midpoint pH, pKb1 and pKb2, and is calculated using the equation:pH = 1/2 (pKb1 + pKb2)

For such more question on fraction

https://brainly.com/question/78672

#SPJ8

Like charges repel each other, while opposite charges attract each other. This principle is one of the fundamental aspects of electrostatics. According to Coulomb's law, the force between two charged particles is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.

As the distance between two charged particles decreases, the force between them increases. This is because the closer the particles are, the stronger the electric field they create, leading to a stronger force of interaction.

On the other hand, as the magnitude of the charges decreases, the force between the particles also decreases. This is because the force is directly proportional to the product of the charges. If one or both of the charges are smaller, the force they exert on each other will be weaker.

In summary, according to Coulomb's law, decreasing the distance between charged particles increases the force between them, while decreasing the magnitude of the charges decreases the force. This understanding of the relationship between charge, distance, and force is crucial in explaining the behavior of charged particles and the interactions between them.

Know more about Coulomb's law here:

https://brainly.com/question/26892767

#SPJ8

The pH scale is a cuantitative method to determine the acidity, basicity or neutrality of a solution. It goes from 1 to 14 because of the hydronium (and hydroxyl) ion concentration of the water:

C-3

(3CO)

O-19

(3CO)+(8H²O)+(4SO₂)

H-16

(8H₂O)

S-4

4(SO₂)

The compound has an empirical formula of \(K_2H_2P_2O_8\) and a molecular formula of \(K_2HPO_4\).

For more questions on empirical formula

https://brainly.com/question/13058832

#SPJ8

The correct question would be as

The composition of a compound is 28.73% K. 1.48% H, 22.76% P, and 47.03% O. The molar mass of the compound is 136.1 g/mol. What is the Molecular Formula of the compound?

\(KH_2PO_4\\KH_3PO_4\\K_2H_4P_20_{12}\\K_2H_3PO_6\)

In 0.8291 moles of hexane (\(C_6H_1_4\)) there are 20.8 liters in 0.8291 moles of hexane at room temperature and atmospheric pressure.

To determine the number of liters in 0.8291 moles of hexane (C6H14), we need to use the ideal gas law equation:

PV = nRT

where:

P = pressure (atm)

V = volume (L)

n = moles of gas

R = gas constant (0.0821 L*atm/mol*K)

T = temperature (K)

We need to rearrange this equation to solve for V:

V = nRT/P

First, we need to calculate the number of moles of hexane:

n = mass/molar mass

The molar mass of hexane (C6H14) is:

6(12.01 g/mol) + 14(1.01 g/mol) = 86.18 g/mol

n = 0.8291 moles

Next, we need to convert the temperature to Kelvin. Assuming room temperature (25°C or 298 K):

T = 298 K

Finally, we need to assume a pressure value. Let's assume atmospheric pressure (1 atm).

P = 1 atm

Now we can plug in the values and solve for V:

V = (0.8291 mol)(0.0821 L*atm/mol*K)(298 K)/(1 atm)

V = 20.8 L

Therefore, there are 20.8 liters in 0.8291 moles of hexane at room temperature and atmospheric pressure.

For more details regarding ideal gas law, visit:

https://brainly.com/question/28257995

#SPJ1

i don't remember yeah yosj

A thermodynamic system's property called enthalpy is the result of adding the internal energy of the system and the product of its pressure and volume.

The change in enthalpy for a chemical reaction, also known as the heat of reaction or delta H, is the amount of heat absorbed or released during the reaction at a constant pressure. To calculate the change in enthalpy for the chlorination of propane, you would need to know the enthalpies of formation for the reactants and products, and use the following equation:

ΔH = ΣΔHf (products) - ΣΔHf (reactants)

Where ΔHf is the enthalpy of formation for a given substance.

Without knowing the specific conditions and reactants, it's not possible to give a exact delta H value for the chlorination of propane. But it's an exothermic process, meaning that heat is released during the reaction. The magnitude of the heat released will depend on the specific reactants and conditions used.

Note that an overview was given as the information is incomplete.

Learn more about enthalpy on:

https://brainly.com/question/14047927

#SPJ1

The sources of energy for humans are associated with the intake of biomolecules in the form of foods (i.e., carbs, proteins and lipids) while in machines​ are associated with the generation of electricity.

The sources of energy for humans are those biomolecules required to carry out metabolic functions, namely carbs, lipids and proteins, which can be oxidized to obtain energy in the form of ATP.

Therefore, with this data, we can see that the sources of energy for humans are biomolecules while the source of energy for machines is electricity.

Learn more about biomolecules here:

https://brainly.com/question/10904629

#SPJ1

dolphin and whales use echolocation

Answer:

The Answer is B

Explanation:

the total mass of the blocks would be the same apart as together.

Answer:

he is a weelder because of him taking a peice of metal and recreateing it.

Explanation:

Answer:

1086.2 mmHg

Explanation:

P1×V1=P2×V2

740mmHg×32.0L=P2×21.8L

23680L mmHg= P2×21.8L

divide both sides by 21.8L

1086.2mmHg=P2

The best definition of crustal deformation is that it is the constructive force that is the result of the edges of Earth's crust pushing and pulling against each other.

Crustal deformation refers to the changes in the shape, position, and orientation of the Earth's crust due to the forces acting on it.

These forces can be compressional, tensional, or shear, and they cause the crust to buckle, fold, fault, and uplift.

Crustal deformation can result in the formation of new landforms, such as mountains, valleys, and plateaus, and can also cause earthquakes and volcanic eruptions.

Thus, the best definition of crustal deformation is that it is the constructive force that is the result of the edges of Earth's crust pushing and pulling against each other.

More on crustal formation can be found here: https://brainly.com/question/13490737

#SPJ1

The hydronium ion concentration [H₃O⁺]=7.826 x 10⁻⁶

In general, the weak acid ionization reaction  

HA (aq) ---> H⁺ (aq) + A⁻ (aq)  

Ka's value  

\(\large {\boxed {\bold {Ka \: = \: \frac {[H ^ +] [A ^ -]} {[HA]}}}}\)

Reaction

HCN(aq) + H₂O(l) ⇌ H₃O⁺(aq) + CN⁻ (aq)

0.125

x                                   x               x

0.125-x                         x               x

\(\tt Ka=\dfrac{[H_3O^+][CN^-]}{[HCN^-]}\)

\(\tt 4.9\times 10^{-10}=\dfrac{x^2}{0.125-x}\approx \dfrac{x^2}{0.125}\\\\x^2=6.125\times 10^{-11}\\\\x=7.826\times 10^{-6}\)

Answer: The partial pressure of nitrogen gas if the total pressure is 111.7 atm is 88.243 atm.

Explanation:

Given: Mole fraction of oxygen = 0.21

Total pressure = 111.7 atm

It is known that the sum of moles fractions is always equal to 1. So, mole fraction of nitrogen is calculated as follows.

Mole fraction of nitrogen + mole fraction of oxygen = 1

Mole fraction of nitrogen = 1 - mole fraction of oxygen

Mole fraction of nitrogen = 1 - 0.21

Mole fraction of nitrogen = 0.79

Now, formula used to calculate the partial pressure of nitrogen is as follows.

\(P_{N} = X_{N} \times P_{total}\)

where,

\(P_{N}\) = partial pressure of nitrogen

\(X_{N}\) = mole fraction of nitrogen

\(P_{total}\) = total pressure

Substitute the values into above formula as follows.

\(P_{N} = X_{N} \times P_{total}\\= 0.79 \times 111.7 atm\\= 88.243 atm\)

Thus, we can conclude that the partial pressure of nitrogen gas if the total pressure is 111.7 atm is 88.243 atm.

Answer: Thus the volume of the balloon at this altitude is 419 L

Explanation:

Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.

The combined gas equation is,

\(\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}\)

where,

\(P_1\) = initial pressure of gas = 751 mm Hg

\(P_2\) = final pressure of gas = 495 mm Hg

\(V_1\) = initial volume of gas = 340 L

\(V_2\) = final volume of gas = ?

\(T_1\) = initial temperature of gas = \(30^oC=273+30=303K\)

\(T_2\) = final temperature of gas = \(-27^oC=273-27=246K\)

Now put all the given values in the above equation, we get:

\(\frac{751\times 340}{303}=\frac{495\times V_2}{246}\)

\(V_2=419L\)

Thus the volume of the balloon at this altitude is 419 L

The molecules in a copper penny is closely packed and and has no space to move apart thus the material will be denser than that in the molten state. That's why the penny sink in the molten copper.

Copper is a transition metal exhibiting all the metallic properties. The molten state of metals is the fluid state where the molecule are not strongly held by the metallic bonds.

Molten material is made by melting them and the liquid like state contains molecules with some space to move apart. Whereas, in solid state as in a copper penny, the molecules are closely packed and have no space to move apart.

An object will sink in a liquid if it is less dense than the liquid. Copper penny is denser than the molten copper because the molecules are densely packed and it will sink on to it.

To find more on density, refer here:

https://brainly.com/question/15164682

#SPJ1

Exothermic refers to chemical interactions that aerobic respiration. Combustion reactions release higher energy. Endothermic refers to atoms and molecules that either use or absorb reactive power.

A chemical process known as an endothermic releases energy as heat or light. It is an endothermic reaction's opposite. Chemical equation expressed as reactants + products + energy. An reaction mechanism is one in which electricity is given off as light or warmth.

A response is deemed to be exothermic if it produces heat while also undergoing a net decrease in basic enthalpy change. Samples include those type of combustion, iron rust, including water froze. Exothermic processes are those that discharge heat and energy into the surroundings.

To know more about exothermic visit:

https://brainly.com/question/13243759

#SPJ1

Answer:

d. 7.7x10^23 molecules

Explanation:

Given the following data:

Mass of water (H2O) = 23g

To find the number of molecules;

First of all, we would determine the number of moles;

\( Number \; of \; moles = \frac {mass}{molar mass} \)

Molar mass of water (H2O) = (1 * 2) + 16 = 18 g/mol

Substituting into the equation, we have

\( Number \; of \; moles = \frac {23}{18} \)

Number of moles = 1.2778 moles

Now, to find the number of water molecules;

We know that Avogadro constant is equal to 6.02 * 10^23 mol¯¹

Number of water molecules = number of H2O moles * Avogadro constant

Substituting into the equation, we have;

Number of water molecules = 1.2778 × 6.02 * 10^23

Number of water molecules = 7.7 × 10^23 atoms.