What is significant about the temperature -40°C?
O
A. It's the boiling point of mercury.
O
B. It's the temperature at which Kelvin and Celsius thermometers
read the same.
O
C. It's the temperature at which Fahrenheit and Celsius
thermometers read the same.
O
D. It's absolute zero.

Crossbreeding in agriculture involves combining two plants to create a new variety with improved traits by using traditional breeding techniques or modern genetic engineering to produce GMOs.So the correcct option is A.

When engineers increase output through crossbreeding, they are combining two plants so that each plant's strengths compensate for the other's weaknesses. This is a method that has been employed to develop new crop varieties with desirable traits such as disease resistance, better nutritional value, and improved shelf-life. Crossbreeding can involve traditional breeding techniques with closely related species or could be done through modern biotechnology practices - creating genetically modified organisms (GMOs), where specific genes are introduced to give the crop beneficial traits like herbicide resistance, better taste, or drought tolerance.

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Answer:  The pressure of the tank will be 2.63 atm

Explanation:

According to ideal gas equation:

[tex]PV=nRT[/tex]

P = pressure of gas = ?

V = Volume of gas = 4.44 L

n = number of moles = 0.481

R = gas constant =[tex]0.0821Latm/Kmol[/tex]

T =temperature =[tex]22.6^0C=(22.6+273)K=295.6K[/tex]

[tex]P=\frac{nRT}{V}[/tex]

[tex]P=\frac{0.481mol\times 0.0821Latm/K mol\times 295.6K}{4.44L}=2.63atm[/tex]

The pressure of the tank will be 2.63 atm

Answer: The pressure of given tank is 2.63 K.

Explanation:

The given data is as follows.

      V = 4.44 L,          n (no. of moles) = 0.481 mol,

      T = [tex]22.6^{o}C[/tex] = (22.6 + 273) K = 295.6 K

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

Now, using the ideal gas equation we will calculate the pressure of the given tank as follows.

               PV = nRT

 [tex]P \times 4.44 L = 0.481 mol \times 0.0821 atm L/mol K \times 295.6 K[/tex]

              P = 2.63 atm

Therefore, we can conclude that the pressure of given tank is 2.63 K.

Answer:

plastids

Explanation:

chloroplasts, chromoplast and leucoplasts, that all conduct photosynthesis

The correct equation to calculate [OH-] from [H+] is [OH-] = Kw / [H+], with Kw being 1.0 × 10^-14 at 25°C.

The correct equation to calculate [OH-] from [H+] is Kw = [H+][OH-], where Kw is the ion-product constant for water (1.0 × 10-14 at 25°C). You can rearrange this equation to solve for [OH-] if [H+] is known: [OH-] = Kw / [H+]. For example, if a solution has a hydronium ion concentration [H3O+] of 1.0 × 10-1M, the hydroxide ion concentration [OH-] can be calculated as follows: [OH-] = 1.0 × 10-14 / 1.0 × 10-1 = 1.0 × 10-13M.

Some applications of fission reactions are for generating large amounts of heat and as the energy source in nuclear weapons.

Nuclear fission is a reaction in which the nucleus of an atom splits into two or more smaller nuclei.

Nuclear fission can be useful in terms of generating large amounts of heat that can be used to produce nuclear power and as the energy source in nuclear weapons.

Thus, some applications of fission reactions are for generating large amounts of heat and as the energy source in nuclear weapons.

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Answer:

B, C, E

Explanation:

Biodiversity is vital for ecosystem resilience, economic benefits, and human health, with examples like the Amazon rainforest illustrating its importance. Biodiversity also provides essential genetic resources for breeding and holds undiscovered potential for scientific advancement.

Biodiversity is paramount due to its extensive benefits to ecosystems, the economy, and human health. With over 5 million known species, biodiversity contributes to the resilience of ecosystems, allowing them to recover from disturbances and providing a buffer against catastrophic events. An example of biodiversity is the Amazon rainforest, where a vast number of species coexist, each playing a role in maintaining the ecological balance. Economic benefits stem from biodiversity's direct provision of food, medicine, and raw materials, many of which we are yet to fully discover and understand. Biodiversity also ensures the availability of genetic resources which are crucial for crop and livestock breeding, leading to food security. Our current lack of knowledge about so many species indicates there is much more to learn, including potential breakthroughs in science and medicine that could enrich human life.

Answer: C. Pressure

Explanation:

Tube-dwelling worms contribute to the health of mudflat ecosystems by aerating the sediment and recycling nutrients, which supports diverse life and adds to the complexity of the food web. They provide essential services that help maintain ecosystem balance.

Tube-dwelling worms play a significant role in mudflat ecosystems. By burrowing into the sediment, the worms aerate the mud, which facilitates the penetration of oxygen and helps recycle nutrients. This process can enhance the productivity of the mudflat by supporting a diverse range of organisms. Tube-dwelling worms, like those around hydrothermal vents, form symbiotic relationships with bacteria. Although the worms you asked about are not the same as those at hydrothermal vents, the principle of symbiosis might still hold in their interactions with other organisms in the mudflat. The tube worms contribute to the complexity of the food web as they become prey for higher-order predator vertebrates. Therefore, their presence and activities are integral to maintaining the structural and functional integrity of the muddy environment they inhabit.

Answer:

removing topsoil, and putting up fencing

Explanation:

hopefully this is correct :)

Answer:

A weak electrolyte is an electrolyte that does not completely dissociate in aqueous solution. The solution will contain both ions and molecules of the electrolyte. Weak electrolytes only partially ionize in water (usually 1% to 10%), while strong electrolytes completely ionize (100%).

Explanation:

The weak electrolyte are characterized to be partially dissociates or ionizable in water. Hence, option B is correct.

Electrolyte can be given as the chemical compound present in the form of liquid or gel with the ability to dissociate into the constituent ion on the dissolution or the application of electricity.

The ability of the electrolyte to be dissociated into the constituent ions differentiate them as strong and weak electrolytes. The electrolytes that can be easily dissociated into the constituent ions are termed as strong electrolytes.

The compounds that found not to be completely ionized into the constituent ions on dissolution in water are termed as weak electrolytes. These are partially ionizable. Thus, option B is correct.

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Answer:

Roughly 323g of H2O.

Explanation:

Balance your chemical equation:

1 Fe3O4 + 4H2 → 3 Fe + 4 H2O

Modulate your stoichiometry 4 steps:

[tex]750g \times \frac{1mol}{55.8g} \times \frac{4mol}{3mol} \times \frac{18g}{1mol} = \\ = \frac{54000}{167.4} = \\ = 322.581g[/tex]

To calculate the atoms of an element in a given molecule, we need to multiply stoichiometry by the number that is written on the foot of that element. Therefore, 180g of H2O will be produced if 750 grams of Fe are produced.

Stoichiometry is a part of chemistry that help us in making relationship between reactant and product from quantitative aspects.

The balanced equation is

Fe[tex]_3[/tex]O[tex]_4[/tex]+ 4H[tex]_2[/tex] → 3Fe+ 4H[tex]_2[/tex]O

Molar mass of Fe=55.845 g/mol

mass of Fe=750 grams

Moles of Fe=13.4moles

The mole ratio between water and Fe is 3:4.

moles of  H[tex]_2[/tex]O produced=(3/4)×13.4moles=10.0

Mass of H[tex]_2[/tex]O produced=molar mass of H[tex]_2[/tex]O × number of moles of H[tex]_2[/tex]O

Mass of H[tex]_2[/tex]O produced=18× 10.0

Mass of H[tex]_2[/tex]O produced=180g

Therefore, 180g of H2O will be produced if 750 grams of Fe are produced.

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Answer:

Option D. 149L

Explanation:

Step 1:

The balanced equation for the reaction. This is given below:

N2 (g) + 3H2 (g) → 2NH3 (g)

Step 2:

Determination of the number of mole of NH3 produced by the reaction of 3.50 mole of N2. This is illustrated below:

From the balanced equation above,

1 mole of N2 reacted to produce 2 moles of NH3.

Therefore, 3.5 moles of N2 will react to produce = 3.5 x 2 = 7 moles of NH3.

Therefore, 7moles NH3 is produced.

Step 3:

Determination of the volume of NH3 produced from the reaction. This can be achieved as shown below:

Data obtained from the question include:

Temperature (T) = 25.0°C = 25.0°C + 273 = 298K

Pressure (P) = 1.15 atm

Number of mole (n) = 7 moles

Gas constant (R) = 0.082atm.L/Kmol

Volume (V) =..?

Applying the ideal gas equation to obtain the volume:

PV = nRT

Divide both side by P

V = nRT /P

V = (7 x 0.082 x 298)/1.15

V = 149 L

Therefore, the volume of NH3 produced from the reaction is 149L

The enthalpy of a reaction can be predicted from the enthalpy of reactants and products. The enthalpy of the reaction is - 175.9 kJ/mol.

The enthalpy of a reaction is the heat energy released or absorbed by the reaction system. For heat absorption, enthalpy is positive and for evolution, enthalpy is negative.

Th enthalpy of reaction = enthalpy of products - enthalpy of reaction.

Given enthalpy of reactants

ΔH (NH₃) = -46.19 kj/mol

ΔH(HCl) = - 92.30 kj/mol

ΔH(NH₄Cl) = -314.4 kj/mol

Reaction enthalpy = -314.4 kj/mol - (-46.19 kj/mol +- 92.30 kj/mol ) =- 175.9 kJ/mol.

Therefore, the reaction enthalpy is - 175.9 kJ/mol..

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Answer:

Gg and Gg

Explanation:

Answer:

Pretty sure that its benzene

Answer:

This happens because there was an electric charge.

Answer:

9.01%

Explanation:

The following data were obtained from the question:

Mass of sodium nitrate, NaNO3 = 56.5g

Mass of solution = 627g

The percentage composition of sodium nitrate, NaNO3 in the solution can be obtained as follow:

Percentage composition of NaNO3 = Mass of NaNO3/mass of solution x 100

Percentage composition of NaNO3 = 56.5/627 x 100 = 9.01%

Therefore, the percentage composition of sodium nitrate, NaNO3 in the solution is 9.01%

Answer:

The percentage of sodium nitrate in the solution is 9.01%

Explanation:

Here we have;

56.5 g of sodium nitrate dissolved in water to make a solution of mass = 627 kg

Mass of sodium nitrate, NaNO₃, in the solution = 56.5 g

Mass of resultant solution = 627 g

The relation for the percentage of a solute by mass dissolved in a solvent is presented as follows;

[tex]Percentage \, by \, mass = \frac{Mass \, of \, solute}{Mass \, of \, solution} \times 100[/tex]

Therefor, for the 56.5 g of sodium nitrate solution, we have;

[tex]Percentage \, by \, mass \, of \, NaNO_3 = \frac{Mass \, of \, NaNO_3}{Mass \, of \, solution} \times 100 = \frac{56.5 \, g}{627 \, g} \times 100 = 9.01 \%[/tex]

Answer:

You are one of the billions of people on our Earth. Our Earth orbits the Sun in our Solar System. Our Sun is one star among the billions in the Milky Way Galaxy. Our Milky Way Galaxy is one among the billions of galaxies in our Universe.

Explanation:

Hi!The solar system has a diameter more than 40 times greater than the distance to the sun, but the solar system is a tiny part of much larger galaxy. Our galaxy (Milky Way) is only one of billions of other galaxies in the universe.

The change in electrons for manganese in the reaction is a gain of 5 electrons per atom, as it is reduced from +7 to +2 during the redox process, resulting in a total gain of 10 electrons for the two Mn atoms involved.

The change in electrons for manganese in the given reaction is a reduction process where manganese (Mn) changes from an oxidation state of +7 to +2. Manganese is initially part of the permanganate ion, MnO4-, with an oxidation state of +7 for manganese. In the reaction with hydrogen peroxide (H2O2), manganese is reduced to Mn2+ with an oxidation state of +2.

Considering the change in oxidation state from +7 to +2, each manganese atom gains 5 electrons during the reaction. This means that for two Mn atoms, as shown in the reaction, there is a total gain of 10 electrons. This is a classic example of a redox reaction, demonstrating the change in oxidation states and the fundamental concept of electron transfer.

Answer:

Im no scientist but I think its D. vacuole

Explanation:

its B why because the reaction is good with B

Answer:

The energy required to melt 9.070 kg of ice is 3047520 J

Explanation:

The mass, m of the ice = 9.070 kg = 907.0 g

The latent heat of fusion, [tex]L_f[/tex]° for ice = 3.36×10⁵ J/Kg

Therefore we have the formula for the energy required to melt the mass m equals

[tex]\Delta H = m \times L_f[/tex]

Plugging in the values, we have;

ΔH = 3.36 × 10⁵ J/Kg×9.070 kg  = 3047520 J or

ΔH = 3.36 × 10² J/g×9070 g  = 3047520 J

Therefore, the energy required to melt 9.070 kg of ice = 3047520 J.

Answer:

C would be the answer.

Explanation:

Answer:

The answer is C. the distribution of electrons in different shells

Explanation:

I got it right on the test

Answer:

17g

Explanation:

4NH3 (g) + 502 (g) –> 4NO (g) + 6H20 (g)

Mass of O2 mole = 32g

Therefore 5O2 = 160g

Mass of NH3 mole = 17g

Therefore 4NH3 = 17 x 4 =68g

Required amount of NH3 = 68 x 40/160 = 17g