Which of the following is a unit of length? O A. A liter O B. A kilogram C. A meter O D. A degree​

Answer:

See attached picture.

Explanation:

Hello there!

In this case, according to the given information, it is possible to complete the table by knowing that the atomic number is the same to the number of protons equals those of electrons and that the neutrons are calculated by subtracting the atomic mass and the protons; thus, we are able to obtain the result as shown on the attached picture.

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Answer:

60 pounds of CO₂ are emited into the air

Explanation:

The combustion of gasoline occurs as follows:

C₈H₁₈(l) + 25/2O₂(g) ⇄ 8CO₂(g) + 9H₂O

Where 1 mole of gasoline produce 8 moles of CO₂

To solve this question we must find the moles of gasoline in 3.1 gallons. 8 times these moles are the moles of CO₂ produced. With the moles of CO₂ we can find its pounds as follows:

Pounds gasoline:

3.1 gallons * (6.3 pounds / gallon) = 19.53 pounds

Grams gasoline:

19.53 pounds * (453.592g / pound) = 8859g

Moles gasoline -Molar mass C8H18: 114.23g/mol-

8859g * (1mol / 114.23g) = 77.55 moles gasoline

Moles CO₂:

77.55 moles gasoline * (8 mol CO₂ / mol Gasoline) = 620.4 moles CO₂

Mass CO₂ - Molar mass: 44.01g/mol-

620.4 moles CO₂ * (44.01g / mol) = 27304g CO₂

Pounds CO₂:

27304g CO₂ * (1lb / 453.592g) =

Answer:

1632 Hz

Explanation:

We'll begin by calculating the frequency of each wave. This can be obtained as follow:

1st wave:

Velocity (v) = 340 m/s.

Wavelength 1 (λ₁) = 5 m

Frequency 1 (f₁) =?

v = λ₁f₁

340 = 5 × f₁

Divide both side by 5

f₁ = 340 / 5

f₁ = 68 Hz

2nd wave:

Velocity (v) = 340 m/s.

Wavelength 2 (λ₂) = 0.2 m

Frequency 2 (f₂) =?

v = λ₂f₂

340 = 0.2 × f₂

Divide both side by 0.2

f₂ = 340 / 0.2

f₂ = 1700 Hz

Finally, we shall determine the difference in the frequency of both waves.

This can be obtained as follow:

Frequency 1 (f₁) = 68 Hz

Frequency 2 (f₂) = 1700 Hz

Difference =?

Difference = f₂ – f₁

Difference = 1700 – 68

Difference = 1632 Hz

Answer:

because we need it to breathe

Explanation:

we breathe in oxygen and release carbon dioxide

Answer:

Ok i have a really weird theory.

Oxygen actually kills us we just don't know it yet. We need it too live but something in it also poisons us and causes us to die in around 100 years from birth. that's why we all die

real answer

we need it to breathe, when we breath we inhale in oxygen and release carbon dioxide which allows trees to grow and they produce more oxygen. We cant rely on anything else because oxygen is important and without it we die. Oxygen is one of the purist airs.

Answer:

Wavelength (typically measured in nanometers) is the distance between two points in a wave.Frequency (typically measured in Hertz) is the number of waves in a specific time . Frequency and wavelength have both direct and inverse relationships. The crucial difference between frequency and wavelength is that frequency shows the total number of wave oscillations in a given time. As against wavelength specifies the distance between two specific points of a wave.

Explanation:

Frequency is how often something changes per second be it amplitude of a voltage on a wire or be it the bobbing back and forth of a bobblehead. Frequency is how often something moves up and down in a second. If a bobble head moves forward and backward in one second then it has a bobbling frequency of 1 Hertz (Hz). The unit of frequency is Hertz (Hz) or # of cycles or oscillations per second. A wavelength is measured in distance like meters (m). For photons or light or radiowaves the equation is wavelength=speed of light/frequency.

Answer:

Wavelength (typically measured in nanometers) is the distance between two points in a wave, while frequency is how often something changes per second be it amplitude of a voltage on a wire or be it the bobbing back and forth of a bobblehead.

Answer: comet

Explanation: :)

Answer:

In paper chromatography, the wet moving edge of the solvent that progresses along the surface where the separation of the mixture is occurring.

Explanation:

I hope this helps and pls mark me brainliest :)

Answer:

It would be important because they will know if the water is infected by some type of disease or harmful bacteria

Explanation:

Answer:

19 protons, 20 neutrons and 18 electrons.

Explanation:

Answer:

check below

Explanation:

You can find the empirical formula of phosphorus oxide

  P                         O

____                   ____

1.347g                  1.744

1.347/ 31            1.744/ 16

0.043                  0.109

0.043/ 0.043   0.109/ 0.043

1                     :        2.5

2                    :         5

P2O5

Answer: All are energy releasing phase changes EXCEPT sublimation.

Explanation:

When molecules with high energy start to lose their energy and begin to settle down then heat energy is released in this process. Hence, this change is exothermic in nature.

When molecules with low energy absorb heat and start moving randomly from one place to another then molecules move to high energy level. Hence, this change is endothermic in nature.

Condensation - The conversion of gas phase into liquid phase is called condensation. Energy is released in this process.

Freezing - The conversion of liquid phase into solid phase is called freezing. Energy is released in this process.

Deposition - The conversion of gas phase into solid phase is called deposition. Energy is released in this process.

Sublimation - The conversion of a solid phase into gas phase without undergoing liquid phase is called sublimation. Energy is absorbed in this process.

Thus, we can conclude that out of the given options all are energy releasing phase changes EXCEPT sublimation.

The aforementioned options are energy releasing phase changes except: D. Sublimation.

A phase change can be defined as the change in the state (phase) of matter of a given chemical compound or substance such as:

In Science, a change in the state (phase) of matter that results in the release of energy is known as an exothermic reaction such as:

In conclusion, sublimation​ is not an energy releasing phase change because it is an endothermic reaction.

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Answer:

15.4%

Explanation:

If Ka = 0.54 mM = 1.51x10⁻⁵

Then;

C₄H₈O₂               -------->            C₄H₇O₂⁻          +           H⁺

I                    0.54x10⁻³                             0                                0

E                   0.54x10⁻³(1-x)                      0.54x10⁻³x                0.54x10⁻³x

Recall that x is the percentage degree of dissociation

From the ICE table;

Ka = [C₄H₇O₂⁻] [ H⁺]/[C₄H₈O₂]

1.51x10⁻⁵=(0.54x10⁻³x) (0.54x10⁻³x)/ 0.54x10⁻³(1-x)  

1.51x10⁻⁵ = 0.54x10⁻³x^2/1-x

1.51x10⁻⁵(1-x) = 0.54x10⁻³x^2

1.51x10⁻⁵ - 1.51x10⁻⁵x = 0.54x10⁻³x^2

Hence;

0.54x10⁻³x^2 + 1.51x10⁻⁵x - 1.51x10⁻⁵=0

x^2 + 0.028x - 0.028 = 0

Solving the quadratic equation here;

x = 0.154 or −0.182

Ignoring the negative result, x = 0.154

Hence, fraction of butanoic acid that is in the dissociated form in this solution = 15.4%

Answer:

first one pure

second one mixture..

Answer:

[tex]T_2=12\°C[/tex]

Explanation:  

Hello there!  

In this case, according to the Charles' law equation which help us to understand the directly proportional relationship between volume and temperature:

[tex]\frac{T_2}{V_2}=\frac{T_1}{V_1}[/tex]  

Thus, by solving for the final temperature, T2, and making sure we use the temperatures in Kelvin, we can calculate the final temperature as shown below:

[tex]T_2=\frac{T_1V_2}{V_1} \\\\T_2=\frac{(27+273)K*19L}{20.0L}\\\\T_2=285-273\\\\T_2=12\°C[/tex]

Best regards!  

Best regards!

During the day at 27°C a cylinder with a sliding top contains 20.0 liters

of air. At night it only holds 19 liters and at that time temperature will be 12 °C.

Charles's law, a statement that the volume occupied by a fixed amount of gas is directly proportional to its absolute temperature, if the pressure remains constant.

According to Charles's law:

[tex]\frac{T_2}{V_2} = \frac{T_1}{V_1}[/tex]

Thus, by solving for the final temperature, [tex]T_2[/tex], and making sure we use the temperatures in Kelvin, we can calculate the final temperature as shown below:

[tex]T_2}= \frac{T_1 X\;V_2}{V_1}[/tex]

[tex]T_2}= \frac{(27 + 273)\; X\;19 liters}{20.0 liters}[/tex]

[tex]T_2= 12[/tex] °C

12 °C is the temperature at night.

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Answer:

Dipole induced dipole force of attraction.

Explanation:

This is because dipole induced dipole attraction is a weak force of attraction or london force that occur when a polar molecule causes a form induction in a dipole in an atom or in a nonpolar molecule by altering the arrangement non polar electrons.

Answer:

794 mmHg

Explanation:

We are going to be using the Combined Gas Law for this problem as well. Just to refresh out memory - the Combined Gas Law expresses the relationship between pressure, volume, and temperature (in KELVIN) of a fixed amount of gas. The equation itself? Right here: [tex]\frac{P_{1}V_{1}}{T_{1}} = \frac{P_{2}V_{2}}{T_{2}}[/tex]

Now, looking at the problem, let's assign the values to its corresponding variable:

P1 = 800mmHg; V1 = 5.0L; T1 = -50°C + 273 = 223K

V2 = 7.0L; T2 = 37°C + 273 = 310K; P2 = ?

We are looking to find the new pressure, a.k.a. P2. So, let's plug and chug the values into the equation.

Set up: [tex]\frac{(800 mmHg)(5.0L)}{223K} = \frac{(7.0L)(P_{2})}{310K}[/tex]

==> [tex]\frac{(800 mmHg)(5.0L)}{223K} * 310K = (7.0L)(P_{2})}[/tex]

==> [tex]P_{2} = \frac{(800 mmHg)(5.0L)}{223K} * \frac{310K}{7.0} }[/tex]

==> [tex]P_{2} =[/tex] 794.36 = 794 mmHg

Answer:

A. Uni-cellular

Answer:

The Sun Ray's hit earths surface at Earths Equator

Answer: Ba(NO3)2(aq) + H2O(l)

Explanation:

Answer:

0.4 M

Explanation:

The process that takes place in an aqueous K₂HPO₄ solution is:

First we calculate how many K₂HPO₄ moles are there in 200 mL of a 0.2 M solution:

Then we convert K₂HPO₄ moles into K⁺ moles, using the stoichiometric coefficients of the reaction above:

Finally we divide the number of K⁺ moles by the volume, to calculate the molarity:

Answer:

One mole of U238 ( 6.022 X 10^23 atoms) is 238 grams; one mole of U235 is 235 grams. The difference in molecular weight between a mole of U235 and U238 is 3 grams, the secret to enriching uranium.

Explanation:

Answer:

Limiting factors of an ecosystem include disease, severe climate and weather changes, predator-prey relationships, commercial development, environmental pollution and more. An excess or depletion of any one of these limiting factors can degrade and even destroy a habitat.

Explanation:

The limiting factor of an ecosystem involve disease, weather change, climate change, environment pollution and more. An excess or depletion of any of these factor can destroy over habitat.

An ecosystem is define as a community or a group of living organisms that live together and are dependent on each other.

There are two main types of ecosystem.

Terrestrial ecosystem are land based ecosystem and interaction of biotic and abiotic component in the specific area.

Example- forest, grassland desert etc.

Aquatic ecosystem are ecosystem formed by surrounding water bodies. They are dependent on each other and their environment .

Example- lake, pond, river etc.

Thus ecosystem and their limiting factor have great impact on the level of organization.

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Answer:

4

Explanation:

From the options provided the result of the error is ( A ) ; The buffer will have a lower capacity because of the smaller number of moles of  HF and F⁻ available to react if an acid or base is added.

Considering the acid ionization equilibrium for the weak acid HF.

A buffer solution is a solution that its PH value remains unchanged when a small amount of acid or base to added to the solution, therefore when the moles of acid or base present in the buffer solution is high enough the buffer solution will have a high buffer capacity. from the mistake of the student the number of moles present is lesser which means that the buffer solution will have a lower capacity

Hence the buffer will have a lower capacity because of the smaller number of moles of HF and F⁻ available to react is an acid or base is added.

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Answer:

The vegetative parts includes the roots, stems,leaves and the reproductive parts include flowers. ... The vegetative parts can reproduce new plants by the process of vegetative propagation but the reproductive parts cannot produce new plants directly instead they produce precursor of new plants that are seeds or fruits.

Answer:

So, weight per litre (1.25g/l) times 22.4 l/mole equals the mole weight (28 g/mole).

Answer:

So, only one electron is there with n = 0, l = 0 and its quantum set is n = 0, l = 0, ml = 0, ms = -1/2. Hope, this is helping. The maximum number of electrons that can fit inside a 'n' shell is 2n^2. So it would be 1.

Explanation:

Quantum numbers are defined as the set of four numbers with the help of which we can get complete information about the electrons in an atom. Here the term 'n' represents the principal quantum number.

The quantum number which represents the main energy level or shell in which electrons are present. It also determines the average distance of orbital or electron from the nucleus. It can have the whole number values like 1,2,3,4, ....

1. When n = 2, the maximum number of electrons present is 8. That is one 's' sub level and three 'p' sub levels. The spin of four electrons will be +1/2 and other four will be -1/2.

2. When l = 3, the possible orientations = 2l + 1 = 2(3) + 1 = 7. So the maximum number of electrons is 14.

3. The value of ml = -1 indicates only one orbital. So the maximum electrons is 2.

4. Here ml = -1, 0, 1 which shows three orbitals. So in ml = -1, there are only two electrons.

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Explanation:

the pressure exerted by the gas is due to the random motion of particles in the gas. Gases have weak intermolecular forces and the particles in continuous random motion and these particles collide with the walls of the container. This collisions with the walls of the container exerts pressure on the gas