20.4 L of 0.650 M HCI reacts with 36L of KOH solution of unknown concentration. What is the molarity of the KOH solution?

From the calculations, we can see that, the change in the freezing point is -0.634°C.

The term freezing point refers to the temperature at which a liquid is changed to solid.

Given that;

ΔT = K  m i

Number of moles sucrose = 35.0 g/ 342.30 g/mol = 0.1 moles

molality =  0.1 moles/ 300.0 * 10^-3 Kg

= 0.33 m

Thus;

ΔT = -1.86°C/mol *  0.33 m * 1

= -0.634°C

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A scientist form a hypothesis because he wants to : (D). To provide a statement that can be tested with an experiment

A hypothesis can be defined as a statement that is proposed by a scientist and needs to be tested by other scientist.

So in a simple statement, hypothesis in its raw state is an untested and unproven fact that is propagated by a scientist.

In conclusion, a scientist form a hypothesis because he wants to : To provide a statement that can be tested with an experiment

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The name of CuO is Copper(II) oxide have the two most common oxidation states of copper are +2 and +1.

Copper oxide is a trace element for the zootechnical and agricultural sector. Cupric oxide is also used as a raw material for the production of catalysts and pigments in the field of ceramics, glass and plastics.

This compound makes two different types of bonds being the hydrogen bond when it's a hydrogen and covalent bond when we have an oxygen or a nitrogen.

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[tex]2C_4H_10+13O+2[/tex] → [tex]8CO_2+10H_2O[/tex] is the balanced chemical equation.

Hence, she should change the coefficient to 2, 13, 8, 10.

A balanced equation contains the same number of each type of atom on both the left and right sides of the reaction arrow.

[tex]2C_4H_10+13O+2[/tex] → [tex]8CO_2+10H_2O[/tex] is the balanced chemical equation.

Hence, she should change the coefficient to 2, 13, 8, 10.

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Answer:

Its d

Explanation:

i did the quiz

The following are the compounds in the list that possesses resonance structures; CO2, [NO2]-, SO2 and OF2

Resonance structures tend to arise when a single structure does not account for all the properties of a compound. This is a concept that arose from the valence bond theory.

The following are the compounds in the list that possesses resonance structures; CO2, [NO2]-, SO2 and OF2

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The rock will be 200 years old if there have been two half-lives.

The half-life  of a radioactive isotope refers to its decay period, which is the average lifetime of an atom before it disintegrates.

In this question (t½) of rock is 100 years, which means that after 100 years half of the sample would have decayed and half would be left as it is.

after two half lives or 200 years , the rock will be 200 years old.

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Answer:

I'm not understand that question

I'm so sorry

Answer:

Based on the data in the table, which alarm produces sound waves with the greatest amplitude? Explain your answer.

this bit says based on the table but there is no table.

Answer: nitrogen

Explanation:

From the equation, we know that for every 3 moles of hydrogen consumed, 1 mole of nitrogen is consumed.

Therefore, nitrogen is the limiting reactant.

After 160 years, the activity level of the sample will be 0.5 curies.

Half life of any radioactive waste is the half decay of that product.

The formula is [tex]\dfrac{\lambda }{\lambda_1} = 2^\dfrac{a}{b}[/tex]

Where, λ is 4 cruies

λ1 is 0.5 cruies

b = 40 years

Putting the values in the equation

[tex]\dfrac{4}{0.5} = 2^\dfrac{a}{40}\\\\\\\dfrac{a}{40} = 4\\ = 160 years[/tex]

Thus, the correct option is 160 years.

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Answer:A

Explanation:

The kinetic molecular theory of matter states that: Matter is made up of particles that are constantly moving. All particles have energy, but the energy varies depending on the temperature the sample of matter is in.This is turn determines shearer the substance exists in the solid, liquid, or gaseous state.

The reactants that will form products will be [tex]2CuI_2 + Br2[/tex].

Elements at higher positions in the activity series will be able to displace those in lower positions in solutions.

Thus:

[tex]2CuI_2 + Br2 --- > 2CuBr +2 I_2[/tex] because Br is higher than I in the activity series.

Cl cannot displace F in [tex]Cl2 + AlF_3[/tex] because F is higher than Cl in the activity series.

Also, Cl is higher than Br in the activity series, thus, the reaction [tex]Br_2 + NaCl[/tex] cannot form products.

I cannot displace F, thus, [tex]CuF_2 + I_2[/tex] cannot form products.

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The ways in which humans are helping endangered animal populations are as follows:

Endangered species are species which are in danger of becoming extinct throughout all or a significant portion of its range.

Extinction refers to the non-existence of a particular species of an organism on the Earth.

One of the ways by which a species of animal can become endangered is through indiscriminate poaching, hence, the ways by which humans are helping endangered animal populations are as follows:

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Answer:

b and

Explanation:

Yes, the atoms in the helium sample have the same average kinetic energy as the atoms in the argon sample.

The average kinetic energy of a gas molecule is defined as the product of half of the mass of each gas molecule and the square of the RMS speed.

The average kinetic energy equation is independent of Molar mass.

It's only a function of temperature.

So if they're at the same temperature they will have the same average kinetic energy.

Therefore, the atoms in the helium sample have the same average kinetic energy as the atoms in the argon sample

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Answer:

See below ~

Explanation:

A to B

⇒ Solid Phase

==========================================================

B to C

⇒ Melting

==========================================================

C to D

⇒ Liquid Phase

==========================================================

D to E

⇒ Vaporizing

============================================================

E to F and beyond

⇒ Gas Phase

Both reactions are the examples of reversible reaction and the reaction moves both forward and backward direction.

In the first equation, hydrogen monoxide molecule is broken down into  water and oxygen molecule. These two molecules again converted into hydrogen monoxide due to reversible reaction and gets equilibrium.

While on the other hand, in the second equation, oxygen molecule turns into ozone molecule and this ozone molecule again converted into oxygen molecule due to reversible reaction and attains equilibrium.

So we can conclude that both reactions are the examples of reversible reaction and the reaction moves both forward and backward direction.

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28.5 J is the amount of energy transferred to the coin.

The specific heat capacity is defined as the quantity of heat (J) absorbed per unit mass (kg) of the material when its temperature increases by 1 K (or 1 °C), and its units are J/(kg K) or J/(kg °C).

Energy is calculated mCΔT formula  where,

m(mass)= 6.30  grams

C(specific heat capacity)= 0.377 j/g

ΔT(change in temperature)= 32.0°C- 20°C= 12 °C

Energy is, therefore:

Q = mCΔT

Q= 6.30 g  x 0.377  j/g /°C x   12 °C

Q= 28.5 J

Hence, 28.5 J is the amount of energy transferred to the coin.

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Answer:

28.5 J is which what is the amount of energy transferred or given to the coin.

Explanation:

Have a great rest of your day
The one and only
Mr. Universe

Answer:

Ok so I assume they gave u a reaction before asking this question. Look at that reaction and try to figure out what substances are changing in valency, if there is a substance(s) that doesn't change its valency then it's a spectator ion.

Answer:

Chemical properties because if it was physical property then it will glow in dark

Answer:

A Dendrologist! They are the type of Scientist that studie trees.

According to table N, the isotopes uranium-238 and uranium-235 have different half lives.

Radioactive nuclides are those nuclides that are able to undergo radioactive decay. They have specific modes of decay that is peculiar to each isotope.

Hence, according to table N, the isotopes uranium-238 and uranium-235 have different half lives.

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The reaction rate constant at –5. 0 ºc is  k2 is 24.3 KJ.

Activation energy is the minimum amount of energy required to carry out a reaction.

The formula is [tex]log \dfrac{k_2}{k_1} = \dfrac{Ea}{2.3R} \;( \dfrac{1}{T_1}- \dfrac{1}{T_2} )[/tex]

Given, K1 is [tex]4. 1 \times 10^3 m^-^1 s^-^1[/tex]

Temperature is 32

k2 is to find?

r = 8.314

Energy is 63.9

[tex]log \dfrac{k_2}{4. 1 \times 10^3 } = \dfrac{63.9 }{2.3\times 8.31} ( \dfrac{1}{32.0}- \dfrac{1}{-5.0} ) = 24.3 kj[/tex]

Thus, the correct option is k2 is 24.3 kJ

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4 moles of nitrogen monoxide gas used to form 72.0 grams of water vapor.

A mole is the measurement unit which is used to correlate the molar mass with number of molecules present.

The equation for reaction of Nitrogen monoxide to form water vapor is given by

4NH₃ + 6NO ----> 5N₂ + 6H₂O

72 grams of water vapor means = 72/18 = 4 mole of water vapour

The mole fraction of NO to H₂O is 6 : 6

Therefore for 4 moles of water vapor formation , 4 moles of nitrogen monoxide will be required.

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111 cchuyttrfgh

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Answer:

- Carbon shares four of its electrons, and each oxygen shares two of its electrons.

Explanation:

Carbon needs 4 electrons to reach a full outer shell while oxygen needs 2 to reach a full outer shell.

Answer: 9.00 mL

Explanation:

[tex]M_{A}V_{A}=M_{B}V_{B}\\(0.295)V_{A}=(0.107)(24.8)\\V_{A}=\frac{(0.107)(24.8)}{(0.295)} \approx \boxed{9.00 \text{ mL}}[/tex]

In this model, electrons are found on unique levels and when jumping from one level to another, electrons emit light at a specific wavelength.

The Bohr model is an atomic model describing the properties of atoms and their constituents (electrons).

This model states different atoms have specific levels of energy where electrons can be located.

In conclusion, in this model, electrons are found on unique levels and when jumping from one level to another, electrons emit light at a specific wavelength.

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Answer:

In the Bohr model, electrons can exist only in certain energy levels surrounding the atom. The energy levels in each atom are unique. When electrons jump from a higher energy level to a lower one, they emit light at a wavelength that corresponds to the energy difference between the levels.

Explanation:

Ed22

The wavelength of an electromagnetic wave that has a frequency of 1.82 x 10¹⁸ Hz in a vacuum is 1.65 × [tex]10^{-10}[/tex]m.

The wavelength of a wave can be calculated by dividing the speed of the wave by its frequency.

According to this question, a wave has a frequency of 1.82 x 10¹⁸ Hz in a vacuum and speed of light in a vacuum is 3.00 × 10⁸ m/s.

λ = [tex]\frac{v}{f}[/tex]

Wavelength (λ) = 3 × 10⁸ ÷ 1.82 × 10¹⁸

Wavelength (λ) = 1.65 × [tex]10^{-10}[/tex] m

Therefore, the wavelength of an electromagnetic wave that has a frequency of 1.82 x 10¹⁸ Hz in a vacuum is 1.65 × [tex]10^{-10}[/tex]m.

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If the engineers are trying to increase the acceleration of the car, they have to decrease the mass of the car.

The Newtons laws of motion form the basis of the discussion about motion. We know that from the second law of Newton F = ma

Thus, if the engineers are trying to increase the acceleration of the car, they have to decrease the mass of the car.

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