I need help with question 10 please

Explanation:

E=hv

6.626*10power of -34 * 587khz

From the Henderson- Hasselbalch equation, the pH of a solution is 3.36.

The pH of a solution made from a weak acid and its conjugate base can be calculated using the Henderson- Hasselbalch equation.

The Henderson- Hasselbalch equation is given below as follows:

where;

pKa of HF = 3.8

[A⁻] = 0.21 M

[HA] = 0.57 M

pH = 3.8 + log (0.21/0.57)

pH = 3.36

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The reaction that is balanced and shows incomplete combustion is:

2 C₅H₁₂ + 11 O₂--> 10 CO + 12 H₂0; option B.

A combustion reaction is a reaction in which a substance reacts with oxygen to release large amounts of heat and light energy.

In the combustion of carbon-containing compounds, carbon dioxide and water are usually produced.

In incomplete combustion of carbon compounds, carbon monoxide or carbon (ii) oxide is produced.

For a balanced reaction, the moles of atoms of elements on the reactant side are equal to the moles of atoms on the product side.

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The most water in the United States is used power plants (thermoelectric power)

What are thermoelectric power plants ?

Water flowing through the boiler's network of pipes is heated, turning it into steam. A shaft connecting a turbine to a generator rotates the blades of a turbine powered by high-pressure steam. As the generator turns, electricity is generated. The thermoelectric power of a given metal is that of a couple made of that metal with lead, with the thermoelectric power of lead being arbitrarily regarded as zero. Rate of change of the thermoelectromotive force of a thermocouple with temperature.

Industrial water withdrawals make up just 5% of all water withdrawals in the US, but thermoelectric power draws make up 49% of all withdrawals. About 12% of the public water supply is also used by industrial and manufacturing companies.

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The statement that explains which component is likely to be more powerful in explaining a scientific phenomenon is:

Scientific knowledge refers to the body of knowledge that is obtained by the scientific method.

The scientific method refers to a series of steps that scientists follow in their discovery and explanation of natural phenomena.

The scientific method is as follows:

Hence, scientific knowledge must explain universal occurrences ad must be testable.

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Answer:

0.40 mole of A

Explanation:

1 mole of A to produce 2 moles of C

so the number of mole of A to produce 0.80 mole of C is:

(0.80 x 1)/(2) = 0.40 mole

Copper metal plus zinc sulfate solution : is not  possible because the copper metal is less reactive than zinc and copper cannot displace the zinc.

The copper metal with zinc sulfate reaction is not possible because copper is less reactive than the zinc cant cannot displace the zinc. so, the reaction :

Cu + ZnSO₄ ---->    no reaction

but the zinc plus copper sulfate is possible , copper is less reactive than zinc and zinc can displace the copper . and the reaction is called as displacement reaction the reacion is given as :

CuSO₄   +   Zn   ----->    ZnSO₄    +   Cu

Thus, Copper metal plus zinc sulfate solution : is not  possible because the copper metal is less reactive than zinc and copper cannot displace the zinc.

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Answer:

Javier's model is better, as the ball-and-stick model shows distinct differences in bond, whereas Carlos' model just shows them as differently colored circles.

Answer:

The answer is if a solid gets dissolved in a liquid then sedimentation and decantation cannot be used because these methods are used to separate an insoluble solid substance but if we add a little sugar or salt it will dissolve in the liquids it is soluble solid making it hard to separate.

Explanation:

I hope this helps

Answer:

298k

Explanation:

because 298k is lower than 302k

A 2.00 gram sample of a glazed donut was placed in a bomb calorimeter with a heat capacity of 3.54 kcal/°C. The sample was completely burned, causing the temperature of the calorimeter to rise by 2.02 °C. kilocalories of energy were stored in the sample is 14.30 kcal.

given that :

mass = 2 g

heat capacity = 3.54 kcal / °C

change in temperature = 2.02 °C

The heat energy expression is given as :

Q = mc ΔT

Q = 2 g × 3.54 kcal / °C × 2.02 °C

Q = 14.30 kcal

Thus, A 2.00 gram sample of a glazed donut was placed in a bomb calorimeter with a heat capacity of 3.54 kcal/°C. The sample was completely burned, causing the temperature of the calorimeter to rise by 2.02 °C. kilocalories of energy were stored in the sample is 14.30 kcal.

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The frequency of the photon is 3.57 * 10^14 Hz. the energy in joules is 2.4 * 10^-19 J while the energy in kJ/mol is 3.9 * 10^-40 kJ/mol.

The energy of the photon can be obtained by the use of an adaptation of the Plank equation. Let us now use;

E = hc/λ

E = energy

h = Plank Constant

c = Speed of light

λ = wavelength

a)

c = λf

f = c/λ

Substituting values;

f = 3 * 10^8/839.6 * 10^-9

f = 3.57 * 10^14 Hz

b)

E = 6.6 * 10^-34 * 3 * 10^8/ 839.6 * 10^-9

E = 2.4 * 10^-19 J

c)

Energy in kJ/mole

Substituting values;

2.4 * 10^-19 J * 10^3/6.02 * 10^23

= 3.9 * 10^-40 kJ/mol

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The mass of Ca CO₃ produced by reacting 2.41 dm³ of 2.33 x 10-2 mol dm-3 of Ca(OH)₂ (aq) with 0.750 dm³ of CO₂ (g) at STP is  30353 g.

The nominal atmospheric conditions at sea level are referred to as "standard temperature and pressure" (STP). The temperature and pressure are both zero degrees Celsius (atm). The STP value is crucial for many professionals, including physicists, chemists, engineers, pilots, and navigators.

1 dm³ = 1L

2.41 dm³=2.41 L

Moles of Ca(OH)₂ = m M. vol (L)

= 2.33×10⁻²m ×2.41 =5.6153  10⁻²Mol

Moles of CO₂ (n) = [tex]\frac{PV}{RT}[/tex] = [tex]\frac{(1 atm) . (0.75L)}{(0.032).(1atm).(273k)x^{2} k^{-1} ml}[/tex]

Moles of CO₂ (n) = 0.0335 mol

          Ca(OH)₂     +      CO₂      ⇒        Ca CO₃     +        H₂O

[tex]I_{mol}[/tex]    5.6153×10⁻²     0.0335mol         0

C         0.0335mol       -0.0335mol      0.0335mol

⇒         0.022653        0                       0.0335mol

Mass of Ca CO₃ = Moles × Molar mass

Mass of Ca CO₃ = 0.0335 mol ×100.0869 g/mol

Mass of Ca CO₃ = 30353 g

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According to the concept of molar concentration, the molarity of phosphoric acid solution is 0.0589 M.

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.

In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.In case where two solutions are given, molarity of one solution is obtained as, M₁V₁=M₂V₂

Substitution in above formula gives, 0.0431×34.21/25=0.0589 M.

Thus the molarity of phosphoric acid is 0.0589 M.

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The statement "OH (hydrogen) was oxidized and S (sulfur) was reduced" is true about this chemical equation.

This chemical reaction is between Sulfur dioxide and nitric acid along with water. When nitric acid reacts with Sulfur dioxide, it gives sulfuric acid and nitrogen monoxide.

In the reaction, the hydrogen atoms in H₂O are oxidized to form H₂SO₄, and the sulfur atoms in SO₂ are reduced to form H₂SO₄.

Therefore, the OH from the water molecule gets oxidized to give out Sulfuric acid. Likewise, the Sulfur from Sulfur dioxide reduces to form the product that is sulfuric acid.

Therefore, the best option that suits the reaction is OH (hydrogen) was oxidized and S (sulfur) was reduced.

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Answer:

I believe the above answer is correct after my test i will let everyone know.

Explanation:

2.5 moles of oxygen will be produced.

A stoichiometric problem can be characterized by two features: the information given in the problem and the information to be solved called the unknown. Both the given and the unknown can be reactants, both products, or one can be a reactant and the other a product. Quantities of substances can be expressed in moles. However, in laboratory situations, it is common to determine the amount of a substance by determining the mass of the substance in grams. The amount of gaseous substance can be expressed in terms of its volume. This concept focuses on the type of problem where both the given quantity and the unknown quantity are expressed in moles.

The molar ratio is a conversion factor that relates the molar amounts of any two substances in a chemical reaction. The numerical value of the conversion factor is obtained from the coefficients of the balanced chemical equation.

For the given reaction:

2H₂O₂ → 2H₂O + O₂

This reaction indicates that the mole ratio of H₂O₂ to O₂ is 2:1 i.e. for every two moles of H₂O₂ one mole of O₂ is produced.

So, for 5.0 moles of hydrogen peroxide, moles of oxygen will be half of 5.0, which is 2.5 moles.

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Yes, because of the liquid's specific heat capacity or heat capacity, different liquids heat up at varying speeds.

Which amount of heat is needed to raise the liquid's temperature by one degree Celsius? When analyzing a mass of 1 kg, the term "heat capacity" or "specific heat capacity" refers to the amount of heat needed to raise the temperature of 1 kilogram of liquid or fluid by 1°C.

area of the body's surface. nature of the body's surface. the body's surface's composition (material effects conductivity through walls of the body).

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Density = mass/Volume    or    D = m/V  

Given:  V = 22.3 gal

           D = 0.8206 g/mL

1)  Rearrange the equation to solve for m

2)  Find conversion factor(s) and convert V from gal to mL (by dimensional analysis) so the units cancel

3)  Solve for m in g

4)  Find conversion factor(s) and convert m from g → lbs

1)  D = m/V  rearranges to  m = D ∗ V

2)  1 gal = 3.785 L  and  1 L = 1000 mL;     22.3 gal  ∗  3.785  L/1 gal  ∗  1000 mL/1 L   =  84 406 mL

3)  m =  0.8206 g/mL  ∗  84 406 mL    =  69 260 g

4)  1 lb = 453.6 g;   69 260  g  ∗  1 lb/453.6 g   =  153 lbs

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Answer:

The colors observed is a sign that definite energy transformations occurs inside the atom gives off light. It follows that electrons must occupy orbits of fixed energy.

Hope that helps!

-28.1 °F is a temperature in Fahrenheit and is converted to degrees Celsius and Kelvin as follows:

Temperature is the measure of cold or heat, often measurable with a thermometer.

Temperature can be measured in the following units;

Kelvins (absolute temperature)

Kelvins (K) is the international system of units (S.I unit), the base unit of thermodynamic temperature; 1⁄273 of the thermodynamic temperature of the triple point of water.

Degrees Celsius is the metric unit of temperature, a derived unit of the International System of Units.

°F is converted to °C as follows:

(32°F − 32) × 5/9 = 0°C

-28.1°F = -33.39°C

°F is converted to K as follows:

(-28.1°F − 32) × 5/9 + 273.15 = 239.761K

= 239.76K

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Answer:

Hope It Helps You

Explanation:

Answer: the balanced equation is the same.

Explanation:

Every element must have the same number of atoms on each side of the equation (law of conservation of mass).

2. Balancing the equation can be done only by adjusting the coefficients.

C

is a balanced element because there is the same number of atoms of

C

in each side of the equation.

C

is a balanced element

H

is a balanced element because there is the same number of atoms of

H

in each side of the equation.

H

is a balanced element

O

is a balanced element because there is the same number of atoms of

O

in each side of the equation. O is a balanced element. Na is a balanced element because there is the same number of atoms of Na on each side of the equation. Na is a balanced element H is a balanced element because there is the same number of atoms of H on each side of the equation. H is a balanced element C is a balanced element because there is the same number of atoms on each side of the equation. C is a balanced element. O

is a balanced element because there is the same number of atoms of

O in each side of the equation. O is a balanced element. All elements have the same number of atoms on each side of the equation, which means that the law of conservation of mass is satisfied and thus the chemical equation is balanced.

The force acting on a moving body can be determined using its acceleration and mass. The mass of the object is 2.3 Kg the force when it is accelerated to 38.6 m/s in 37 seconds is 2.4 N.

Force is an external agent acts on a body to change it from the state of motion or rest. Various kinds of forces include gravitational force, frictional force, nuclear force etc.

In physics, force is the product of mass and acceleration. Acceleration of an object is the rate of change in its velocity. Here, the change in speed from rest is 38.6 m/s and the time taken is 37 seconds hence the acceleration is:

a = 38.6 m/s / 37 s

  = 1.04 m/s².

Now, the force can be calculated from by taking the product of mass and acceleration as follows:

F = ma

  = 2.3 Kg × 1.04 m/s²

  = 2.4 N.

Hence, the force acting on the object to change it from rest is 2.4 N.

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Taking into account the change of units, the 3.20 bar in atm is 3.15815 atm.

The rule of three is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them.

If the relationship between the magnitudes is direct, the direct rule of three must be applied. To solve a direct rule of three, the following expression must be followed, being a, b and c known data and x the variable to be calculated:

a ⇒ b

c ⇒ x

So: x= (c×b)÷a

The direct rule of three is the rule applied in this case where there is a change of units.

You can apply the following rule of three: if 1.01325 bar equals 1 atm, 3.20 bar equals how many atm?

1.01325 bar ⇒ 1 atm

3.20 bar ⇒ x

So: x= (3.20 bar× 1 atm)÷ 1.01325 bar

Solving:

x= 3.15815 atm

In summary, the pressure is 3.15815 atm.

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The heat that is released by the 1.39 Kg of pentane is 58518 kJ.

We know that the combustion of pentane is an exothermic reaction because heat is released in the process. We have to look to the  balanced thermochemical reaction equation for the combustion of pentane.

Given that the number of moles of the pentane that is burnt here =  1.39 * 10^3 g/72 g/mol

= 19.3 moles

Now;

If we require 3032 kJ of energy to burn one mole of pentane

If we have 19.3 moles of pentane then we have;

19.3 moles *  3032 kJ/ 1 mole

= 58518 kJ

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Answer:

True.

Explanation:

Explanation:

c=v * lambada