How can you know if evolution has occured within species?​

We can use the dilution formula to find the volume of the diluted solution to be prepared

c1v1 = c2v2

Where c1 is concentration and v1 is volume of the concentrated solution

And c2 is concentration and v2 is volume of the diluted solution to be prepared

Substituting the values in the equation

15 M x 25 mL = 3 M x v2

v2 = 125 mL

The 25 mL concentrated solution should be diluted with distilled water upto 125 mL to make a 3 M solution

To dilute 25 mL of 15 M nitric acid to prepare a 3 M solution, the final volume after dilution should be c. 125 mL.

To dilute 25 mL of 15 M nitric acid to prepare a 3 M solution, you can use the formula:

C₁V₁ = C₂V₂

Where C₁ = concentration of the stock solution, V₁ = volume of the stock solution, C₂ = final concentration, and V₂ = final volume after dilution.

To prepare a 3 M solution, you need to dilute the 25 mL of 15 M nitric acid to a final volume of 125 mL.

Correct question is: To what volume should 25ml of 15m nitric acid be diluted to prepare a 3M solution

a. 120 ml

b. 130 ml

c. 125 ml

d. 135 ml

Answer:

328.1 K.

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.

P₁V₁T₂ = P₂V₂T₁

P₁ = 1.0 atm (standard P), V₁ = 72.1 L, T₁ = 25°C + 273 = 298 K (standard T).

P₂ = 93.6 kPa = 0.924 atm, V₂ = 85.9 L, T₂ = ??? K.

T₂ = P₂V₂T₁/P₁V₁ = (0.924 atm)(85.9 L)(298 K)/(1.0 atm)(72.1 L) = 328.1 K.

To solve for the temperature at which the gas occupies a given volume at a given pressure, we can use the ideal gas law equation PV = nRT.

To solve this problem, we can use the ideal gas law equation: PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.

First, we need to find the number of moles of gas using the given information. Since the gas occupies 72.1 L at STP (standard temperature and pressure), we can use the molar volume of a gas at STP (22.4 L/mol) to calculate the number of moles: n = 72.1 L / 22.4 L/mol = 3.21 mol.

Next, we can rearrange the ideal gas law equation to solve for the temperature: T = PV / (nR). Plugging in the values we have, T = (93.6 kPa)(85.9 L) / (3.21 mol)(8.31 J/mol·K) = 277 K.

B would be right. Liquids are closer together than gases and liquids move slower.

Taking into account the definition of liquid state and gaseous state, the correct option is option b. They are closer together and slower moving than the particles in a gas.

Matter comes in three states or forms of matter: solid, liquid, and gas.

The solid state is characterized because the particles that compose it are very close together and in more or less fixed positions; this makes the distance between the particles practically unchanged.

This is due to the fact that the attractive forces are very strong, so the shape and volume are constant.

In the case of the liquid state, the forces between the particles are weaker than in the solid state, which allows the particles to have some freedom of rotation and translation, in addition to vibration.

That is why liquids, unlike solids, take variable forms, depending on the container that contains them and can also flow easily.

In the gaseous state, the attractive forces are practically zero, so they occupy all the available space, and they move much faster. In addition, they can be compressed and take the shape of the container that contains them.

In summary, the correct option is option b. They are closer together and slower moving than the particles in a gas.

Learn more:

Answer: Option (C) is the correct answer.

Explanation:

Activation energy is defined as the minimum amount of energy required for a chemical reaction to start.

An activated complex is also known as transition state where bonds between the reactants are breaking and bonds between the products are forming.

For a chemical reaction, activation energy is required to result in the formation of activated complex.

Therefore, we can conclude that every chemical reaction require a certain amount of activation energy because forming the activated complex requires energy.

Answer:

c

Explanation:

i got it right on plato

Answer:

A

Explanation:

Final answer:

The gases in the thermosphere are heated directly by the sun, as this layer directly absorbs high energy solar radiation leading to increased temperatures.

Explanation:

The atmospheric gases in the thermosphere are heated directly by the sun. The thermosphere is the layer of the Earth's atmosphere that is directly exposed to the sun's radiation. As solar radiation passes through the atmosphere, shortwave radiation reaches the thermosphere where it is absorbed by the sparse gas molecules present, causing temperatures to rise considerably.

Unlike the lower layers of the atmosphere, such as the troposphere, where heat is primarily transferred from the Earth's surface through longwave radiation, the thermosphere receives its heat directly from the sun, due to the high energy ultraviolet and X-ray solar radiation absorbed by its gases. This direct heating is essential in understanding the thermal dynamics of the upper atmosphere.

ANSWER:

its because the ocean has a higher heat capacity.

~batmans wife dun dun dun...aka ~serenitybella

Water is a slow conductor of heat, thus it needs to gain more energy than the sand or dry land in order for its temperature to increase. On the other hand, soil loses its heat much faster. ... Not only do the oceans cover more than 2/3 of the Earth's surface, they also absorb more sunlight and store more heat.

Answer:

1,620 J.

Explanation:

Q = m.c.ΔT.

where, Q is the amount of heat released from ethanol cooling,

m is the mass of ethanol (m = 60.0 g),

c is the specific heat of ethanol in the liquid phase, since the T is cooled below the boiling point and above the melting point (c = 1.0 J/g °C),

ΔT is the temperature difference (final T - initial T) (ΔT = 43.0 °C – 70.0 °C = - 27.0 °C).

∴ Q = m.c.ΔT = (60.0 g)(1.0 J/g °C)(- 27.0 °C) = - 1620 J.

The system releases 1620 J.

Answer:

1,600 J

Explanation:

Obama said so

D. Endothermic because it needs the sunlight's energy!

Good Luck!!! Hope I helped!

Answer: The correct answer is Option D.

Explanation:

Endothermic reactions are defined as the reactions in which energy is absorbed by the system. The total enthalpy change of the reaction comes out to be positive.

Exothermic reactions are defined as the reactions in which energy is released by the system. The total enthalpy change of the reaction comes out to be negative.

Decomposition reaction is defined as the reaction in which a large substance breaks down into two or more smaller substances.

Photosynthesis is defined as the process by which the producers make glucose molecule with the help of carbon dioxide and water in the presence of sunlight.

The chemical equation representing this reaction follows:

[tex]6CO_2+6H_2O+\text{light}\rightarrow C_6H_{12}O_6+6O_2[/tex]

As, the energy term is written on the reactant side. This means, that the energy is getting absorbed by the system and is considered as an endothermic reaction.

Hence, the correct answer is Option D.

To find the number of sulfur atoms in 64g of sulfur, calculate the moles by dividing the mass by sulfur's molar mass (32 g/mol), then multiply by Avogadro's number to get 1.2044 x 10^24 sulfur atoms.

To calculate the number of sulfur atoms in 64g of sulfur, we use the concept of molar mass and Avogadro's number. The molar mass of sulfur (S) is approximately 32 grams per mole. So, to find the number of moles of sulfur in 64g, we divide the mass by the molar mass:

Number of moles of S = mass of S (g) / molar mass of S (g/mol)

Number of moles of S = 64g / 32g/mol = 2 moles

Now, using Avogadro's number (6.022 x 1023 atoms/mole), we can find the total number of atoms:

Number of sulfur atoms = number of moles of S x Avogadro's number

Number of sulfur atoms = 2 moles x 6.022 x 1023 atoms/mole = 1.2044 x 1024 atoms

So, there are 1.2044 x 1024 sulfur atoms in 64g of sulfur.

= 47.04 L

1 mole of a gas at s.t.p occupies a volume of 22.4 liters

Therefore;

2.1 moles of Cl2 will occupy;

2.1 moles × 22.4 L

= 47.04 L

The answer to this is C.

Answer:

The pressure equilibrium constant (Kp) = (P O₂)³/(P CO₂)²(P H₂O)⁴.

Explanation:

2CO₂ (g) + 4H₂O (g) → 2CH₃OH (l) + 3O₂ (g).

The pressure equilibrium constant (Kp) = the product of the pressure of the products side components / the product of the pressure of the reactantss side components.

each one is raised to a power equal to its coefficient.

∴ The pressure equilibrium constant (Kp) = (P O₂)³/(P CO₂)²(P H₂O)⁴.

The pressure equilibrium constant expression for the reaction 2CO₂ (g) + 4H₂O (g) → 2CH₃OH (l) + 3O₂ (g) is Kp = (PO₂)³ / (PCO₂)²(PH₂O)⁴, considering only the gases involved, while excluding the liquid CH₃OH from the expression.

The pressure equilibrium constant expression for the reaction 2CO₂ (g) + 4H₂O (g) → 2CH₃OH (l) + 3O₂ (g)  (g) involves including the partial pressures of gas-phase species and excluding the pure liquids and solids from the expression. According to the rules for writing equilibrium constant expressions, it is given by:

Kp =  (PO₂)³ / (PCO₂)²(PH₂O)⁴

However, since CH₃OH is in the liquid phase, it does not appear in the equilibrium expression. Instead, we use the partial pressures of CO₂ and O₂, the gases present in the reaction.

Answer:

P2 = 150.4 KPa

Explanation:

Gay-Lussac's Law:

at constant volume, the pressure of a gas varies directly with the temperature

∴ P1 = 55 KPa

∴ T1 = - 100.0°C ≅ 173 K

∴ T2 = 200°C ≅ 473 K

⇒ P2 = ?

⇒ P2 = (473 K)(55 KPa) / (173 K)

⇒ P2 = 150.4 KPa

The pressure of the gas when the temperature is increased to 200°C will be 150 kPa.

We can use Gay-Lussac's Law, which states that the pressure of a given mass of gas is directly proportional to its absolute temperature (in Kelvin) when the volume is kept constant. Mathematically, this can be expressed as:

[tex]\[ \frac{P_1}{T_1} = \frac{P_2}{T_2} \][/tex]

where [tex]\( P_1 \)[/tex] and [tex]\( T_1 \)[/tex] are the initial pressure and temperature, and [tex]\( P_2 \)[/tex] and [tex]\( T_2 \)[/tex] are the final pressure and temperature, respectively.

First, we need to convert the temperatures from Celsius to Kelvin:

Initial temperature [tex]\( T_1 \)[/tex] in Kelvin is:

[tex]\[ T_1 = -100.0^\circ C + 273.15 = 173.15 \text{ K} \][/tex]

Final temperature [tex]\( T_2 \)[/tex] in Kelvin is:

[tex]\[ T_2 = 200^\circ C + 273.15 = 473.15 \text{ K} \][/tex]

Now we can apply Gay-Lussac's Law to find the final pressure [tex]\( P_2 \)[/tex]:

[tex]\[ \frac{55 \text{ kPa}}{173.15 \text{ K}} = \frac{P_2}{473.15 \text{ K}} \][/tex]

Solving for [tex]\( P_2 \)[/tex]:

[tex]\[ P_2 = \frac{55 \text{ kPa} \times 473.15 \text{ K}}{173.15 \text{ K}} \][/tex]

[tex]\[ P_2 = \frac{25923.25 \text{ kPa}}{173.15} \][/tex]

[tex]\[ P_2 \approx 150 \text{ kPa} \][/tex]

C. 352.6 m/s

Velocity of sound is dependent on temperature. An increase in temperature, increases the velocity of sound.

To calculate the velocity of the sound wave, we use this formula:

V = 331 + [0.6*T]; Where V is the velocity and T represents temperature.

When the temperature is 36 degree Celsius, we have 

V = 331 + [0.6 * 36]

V = 331 + 21.6 = 352.6 

Therefore,

 V = 352.6 m/s.

Hey im happy to help!

your answer here will be:

D) The chemicals illegally dumped may cause lymphoma to occur at a higher rate.

Hope this helps, have an amazing rest of your day!

Answer:

The correct answer is option D) "The chemicals illegally dumped may cause lymphoma to occur at a higher rate".

Explanation:

In the graph "Occurrence of Lymphoma" it can be noticed that the lymphoma rate was higher for people living near the factory (local rate), but as times went by, the national rate started to be as high as the local rate. By analyzing this data it can be concluded that the chemicals illegally dumped may cause lymphoma to occur at a higher rate. The chemicals that affect people living locally started to affect people around the nation because they were illegally dumped. I attached the missing graph.

Answer:b

Explanation:

Law of Conservation of Energy and Mass. The law of conservation of energy, a fundamental concept of physics, states that the total amount of energy remains constant in an isolated system. It implies that energy can neither be created nor destroyed, but can be change from one form to another.

D. Energy is transferred when atoms are rearranged

A chemical change produces a new substance. When a chemical change takes place, electrons are either given away or received, that’s how you form a bond. Examples on how to identify a chemical change would be, if a gas is produced, precipitate, color change, temperature change. A chemical change can either be endothermic or exothermic.

We can calculate the amount of Oxygen in this volume using the Ideal Gas Equation, PV = nRT, where "P" is the pressure, "V" is the volume, "n" is the number of moles of material, "R" is the gas constant, and "T" is the temperature in Kelvin. To properly answer this problem, all of the information needs to be converted into the proper units. Fortunately, everything except the volume and temperature is in the correct units for the Ideal Gas Equation; the volume can be adjusted by converting mL to L (x1000) and the temperature can be adjusted by adding 273.15 to the current temperature (conversion from Celsius to Kelvin).

Plugging in all the values, we find that:

PV = nRT

(2.7 atm)(0.3 L) = n(0.0821*)(313.15 K)

n = 0.0315 mol Oxygen

Under these conditions, 0.0315 moles of oxygen can be placed in this volume.

Hope this helps!

* - the units are liters times atmospheres divided by moles times Kelvin.

CH3CH3 boils at -88.6°C.

At typical atmospheric pressure (1 atmosphere or 101.3 kPa), the boiling point of [tex]CH_3CH_3[/tex] , commonly known as ethane, is approximately −88.6 °C (−127.5 °F).

Ethane is a simple hydrocarbon composed of two carbon atoms linked by a single covalent link as well as three hydrogen atoms on either side of each carbon atom. At normal room temperature and atmospheric pressure, ethane is a gas.

Ethane has a low boiling point because the intermolecular interactions between its molecules are weak. The London dispersion force, a result of transient variations in electron distribution, holds the ethane molecules together. The boiling point is low because these forces are often less than those of hydrogen bonding or dipole-dipole interactions.

Learn more about boiling point, here:

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The type of bond that exists between the two carbon atoms would be a single covalent bond.

Carbon atoms generally have 4 valence electrons and can therefore form bonds with multiple atoms by sharing the electrons with the atoms to reach an octet state. It also has the capacity to form double or triple covalent bonds with different atoms, including itself.

Out of the 4 valence electrons and covalent bonds that can be formed by the carbon, 3 have been formed with hydrogen. Thus only one bond is left and that is what the carbon atom can pick up. Hence, only a single covalent bond can be formed.

More on the carbon atom can be found here:  https://brainly.com/question/4704641

We can calculate the new volume of the gas using the Combined Gas Law:

(P1 x V1) / T1 = (P2 x V2) / T2

The initial volume, pressure, and temperature were 280 mL, 1.3 atm, and 291.15 K (changing the temperature into Kelvin is necessary), and the final volume, pressure, and temperature is V2, 3.0 atm, and 308.15 K. Plugging these values in and solving, we find that:

(P1 x V1) / T1 = (P2 x V2) / T2

(1.3 atm x 280 mL) / 291.15 K = (3.0 atm x V2) / 308.15 K

V2 = 128.42 mL

This makes sense considering the conditions, a small increase in temperature would make the gas expand but a significant increase in the pressure would cause the volume to decrease.

Hope this helps!

C. Liquid. The Earth is mostly water, namely ocean water which is liquid.

Answer:

Mafic minerals contain more dark-colored, high-density minerals.

Explanation:

Mefic and felsic minerals represent two kinds of minerals or lava.

For example, mefic lava is more viscous than felsic lava.

The other difference is that word mafic is related to presence of Magnesium and iron minerals more while in felsic (Feldspar) silica content is more.

Mefic minerals are associated with dark color while felsic are lighter in color.

Mafic minerals are dark-colored and high-density due to their higher iron and magnesium content, whereas felsic minerals are light-colored and low-density with higher silica content. The correct answer is B. Mafic minerals contain more dark-colored, high-density minerals.

The key difference between mafic and felsic minerals lies in their chemical composition and resulting physical properties. Mafic minerals are dark-colored and high-density minerals due to their higher iron (Fe) and magnesium (Mg) content and lower silica content. On the contrary, felsic minerals are typically light-colored and low-density, as they contain a higher concentration of silica in the form of quartz and orthoclase feldspar, and are lower in iron and magnesium.

Therefore, the correct answer to the student's question is: Mafic minerals contain more dark-colored, high-density minerals.

Mafic rocks like basalt and gabbro are primarily composed of minerals such as pyroxene and olivine, which contribute to the darker color and higher density, while felsic rocks such as granite and rhyolite are rich in quartz and potassium feldspar, giving them a lighter color and lower density.

Answer:

Lateral

Explanation:

Is the opposite side of the midline

Answer:

Lateral

Explanation:

0.00115g x 12.01g/mol (molar mass of cabon) x 6.02 x 10^23 moles/atoms = 8.31x10^21

The atoms of carbon are in 0.00115 grams of carbon is 8.31 x 10²¹moles.

The term mole is defined as the amount of substance in a system which include as many elementary entities as there are atoms present in it. It is denoted by the symbol “mol”. The word mole is coming from the Latin word moles, which means “a mass”.

The mole is also defined as it contain exactly 6.023 × 10²³ elementary entities present in it. 1 mole is exactly equal to the 6.023 × 10²³ elementary entities.

Molar mass of carbon = 12.01g/mol

1 mole = 6.02 x 10²³ moles/atoms

We have to calculate 0.00115 grams of carbon in an atom.

0.00115g x 12.01g/mol (molar mass of carbon) x 6.02 x 10²³ moles/atoms

=.31 x 10²¹mole.

Thus, The atoms of carbon are in 0.00115 grams of carbon is 8.31 x 10²¹moles.

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According to google, "As keratin cells naturally push upward through the skin, they die and then harden, turning into your hair or nails."

Mark brainliest if you can! Thanks

B) H30+ is the answer, hope that helped

Answer: Option (B) is the correct answer.

Explanation:

A hydronium ion is an ion that contains three hydrogen atoms and one oxygen atom. Formula of a hydronium ion is [tex]H_{3}O^{+}[/tex].

Whereas water is a molecular compound with chemical formula [tex]H_{2}O^[/tex].

Hydroxide ion has formula [tex]OH^{-}[/tex] and a hydrogen ion has formula [tex]H^{+}[/tex].

Therefore, we can conclude that out of the given options [tex]H_{3}O^{+}[/tex] is a hydronium ion.

Answer:

1.04 L

Explanation:

Charles law states that for a fixed mass of gas, volume of gas is directly proportional to the absolute temperature at constant pressure.

[tex]\frac{V1}{T1} = \frac{V2}{T2}[/tex]

where V1 is the volume and T1 is absolute temperature at first instance

and V2 is volume and T2 is absolute temperature at the second instance

Absolute temperature is temperature in the kelvin scale

T1 - 25 °C + 273 = 298 K

T2 -   -15 °C + 273 = 258 K

substituting the values in the equation

[tex]\frac{1.2 L}{298K} = \frac{V2}{258K}[/tex]

V2 = 1.04 L

when the temperature is -15 °C the volume is 1.04 L

Final answer:

Bacteria help plants grow by fixing nitrogen, decomposing organic matter, and improving soil fertility, in a mutualistic relationship where they also gain nutrients from plant photosynthates.

Explanation:

Bacteria play a crucial role in helping plants grow by engaging in a variety of symbiotic relationships and processes. One key interaction is the presence of nitrogen-fixing bacteria such as rhizobia, which live in nodules on the roots of legumes and convert atmospheric nitrogen into forms that plants can use as nutrients, effectively supplying plants with an endless supply of nitrogen. This process naturally fertilizes the soil, promoting plant growth. In addition to this, many species of bacteria decompose organic matter, releasing nutrients back into the soil, which plants can then absorb. Bacteria also benefit from this relationship by using photosynthates, which are substances produced during photosynthesis by the plants. This mutualistic relationship is critical for the soil’s fertility and the overall health of the ecosystem.