Over the past 400,000 years. CH4 in the atmosphere is generally greatest when global temperature is greatest. ( T orF)

1. 5 moles

2. 75.6 grams

3. 2 moles

4.  1.806 x 10²⁴ particles

Given

mass and moles of compound

Required

mass, moles and number of particles

Solution

1. 530 g Na2CO3

mol = 530 g : 106 g/mol

mol = 5

2. 4.2 moles H2O

mass = 4.2 moles x 18 g/mol

mass = 75.6 grams

3. 12.04 x 10²³ O2

mol =   12.04 x 10²³ : 6.02  x 10²³

mol = 2

4. 3 moles of Mg

particles = 3 x 6.02  x 10²³

particles = 1.806 x 10²⁴

The findings of scientific investigation can be seen in four real-world situations:

Finding the answer to a topic through a variety of research techniques is the process of conducting a scientific investigation.

Thus, the findings of scientific investigation can be seen in four real-world situations:

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can i please get brainlyest

"the view or belief that the rights and needs of humans are not more important than those of other living things."

Answer:

the view or belief that the rights and needs of humans are not more important than those of other living things.

explanation:

Answer:  In two molecules of carbon dioxide (2CO2), there are _____.

two atoms of carbon

four atoms of oxygen

hope this helps

Explanation:

a prolong storm will occur

that's what I found

Option B is correct. It will also change from a solid to a liquid at 24 degrees celsius while the solid gains energy

The point where solid and liquid coexist is known as the freezing point. Based on this definition, the last two options are incorrect since freezing does not involve the change of solid state to gaseous state.

The freezing point is therefore the temperature at which a solid substance gains energy to overcome the force of attraction between the molecules to change to the liquid state.

Hence for a substance that has a freezing point of 24 degrees celsius, the substance will therefore change from a solid to a liquid at 24 degrees celsius while the solid gains energy.

Answer:

Without new antibiotics, common infections and minor injuries could become life-threatening and major surgeries and chemotherapy impossible because the treatments we have been using for years are no longer effective.

The pressure of a gas inside a balloon filled with 0.8450 mol of gas at 315.00K is 1.374atm.

The pressure of a gas can be calculated by using the following formula:

PV = nRT

Where;

According to this question, a 15.9L balloon is filled with 0.8450 mol of gas at 315.00 K. The pressure is calculated as follows:

P × 15.9 = 0.8450 × 0.0821 × 315

15.9P = 21.85

P = 1.374atm

Therefore, the pressure of a gas inside a balloon filled with 0.8450 mol of gas at 315.00K is 1.374atm.

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Answer:

\( \sqrt[.132 = ]{32 = ? = 1} = .82\)

Answer:

693 j

Explanation:

weight =75 g * specific heat of copper = .385j/g * change in temp = 24

= 693

From the outcome of the experiment, we could infer that the salt inhibited the growth of the grass.

The following were observed from the experiment:

Thus, we can conclude that:

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The complete question goes thus:

Observation: I want to know what effect salt has on the growth of grass. So I measure out 3 equal-sized squares of grass out the back of the Green Building. The first square of lawn I water with 5 liters of pure water from a watering can every day. The second square of lawn I water with 5 liters of pure water with 2 grams of salt mixed in, every day. The third square of lawn I water with 5 liters of pure water with 4 grams of salt mixed in, every day. I measure the height of the grass after 14 days and note the following observations. The first square is green and 15 cm high. The second square is greeny-yellow and 6 cm high. The third square is yellowy-brown and looks dead and is only 2cm high. What could we infer about the effect salt has on the growth of grass?

Taking into account the definition of wavelength, frecuency and propagation speed, the correct answer is option A.: The frequency corresponding to an absorption line at 527 nm is 5.69×10¹⁴ Hz

Wavelength is the minimum distance between two successive points on the wave that are in the same state of vibration. It is expressed in units of length (m).

Frequency is the number of vibrations that occur in a unit of time. Its unit is s⁻¹ or hertz (Hz).

The propagation speed is the speed with which the wave propagates in the medium.

The propagation speed relate the wavelength (λ) and the frequency (f) inversely proportional using the following equation:

v = f×λ

All electromagnetic waves propagate in a vacuum at a constant speed of 3×10⁸ m/s, the speed of light.

In this case, you know:

Replacing in the definition of propagation speed:

3×10⁸ m/s= f× 527×10⁻⁹ m

Solving:

f= 3×10⁸ m/s ÷ 527×10⁻⁹ m

f= 5.69×10¹⁴ Hz

In summary, the correct answer is option A.: The frequency corresponding to an absorption line at 527 nm is 5.69×10¹⁴ Hz

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From the given data, the name of the hydrated salt would be  \(CoCl_2.83H_2O\).

The formula of the hydrated salt can be determined using the empirical formula approach. That is, we will find the mole equivalent of the anhydrous salt and the water of hydration and then combine them into a single formula after dividing by the smallest mole.

First, we need to determine the mass of the anhydrous salt and the water of hydration.

Mass of crucible (x) = 12.090 g

Mass of hydrated salt + crucible (y) = 16.250 g

Thus, the mass of the hydrated salt can be determined by subtracting x from y.

Mass of hydrated salt = 16.250 - 12.090 = 4.16 g

Mass of hydrate + crucible after evaporating off the water (z) = 12.424 g

Mass of anhydrous salt = z - x

                                      = 12.424 - 12.090

                                      = 0.334 g

Mass of water = 4.16 - 0.334

                        = 3.826 g

Now, let's find the moles:

Molar mass of \(CoCl_2\) = 129.839 g/mol

Molar mass of water = 18.01 g/mol

Mole of \(CoCl_2\) = 0.334/129.839 = 0.00257 mol

Mole of water = 3.826/18.01 = 0.2124 mol

Dividing through by the smallest mole

\(CoCl_2\) =  0.00257 / 0.00257  = 1

water = 0.2124/ 0.00257 = 83

Thus, the formula of the hydrate would be \(CoCl_2.83H_2O\)

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Molecules' general shape, as well as bond lengths, bond angles, torsional angles, and any other geometrical factors that affect each atom's position, are revealed by their molecular geometry. The molecular geometry of AsCl₃ is trigonal pyramidal.

Molecule geometry is the study of the three-dimensional configuration of the atoms that make up a molecule. Because the shared pairs of electrons remain localized in a specific location between the nuclei of the involved atoms, covalent molecules have directed bonds.

The arsenic atom is surrounded by 4 regions of electron density which means that it has a steric number equal to 4. According to VSPER Theory, the molecular geometry will be trigonal pyramidal, AX₃E₁.

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Answer:

Ionic

Explanation:

If A does not have electron to bond, it just receives one electron from B.

It can´t be covalent because A don´t have any electrons to bond with B.

The structure for 2-methyl-3-propalhex-2-yne can be shown in the image attached.

We know that a compound is composed of atoms that can be found in the compound. For the organic compound, we can see that we can be able to obtain the structure of the compound from the structure.

The compound as we can see is  2-methyl-3-propalhex-2-yne. The structure of the compound must be able to include a double bond as we can clearly see from the image that is attached to this answer.

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Answer:

a. 300 Kg of fertilizer

b. 225 Kg of fertilizer

c. 400 Kg of fertilizer

d. 600 Kg of fertilizer

Explanation:

The percentage composition ratio of Nitrogen, Phosphorus and Potassium in a 1 Kg bag of the given fertilizer is 40:15:10.

Therefore a  1 Kg bag contains;

40/100 * 1 Kg = 0.4 Kg of Nitrogen;

15/100 * 1 Kg = 0.15 Kg of phosphorus;

10/100 * 1 Kg = 0.1 Kg of potassium

Quantity of fertilizer required to add to a hectare to supply;

a. Nitrogen at 120 kg/ha = 120/0.4 = 300 Kg of fertilizer

b.. Nitrogen at 90 Kg/ha = 90/0.4 = 225 Kg of fertilizer

c. Phosphorus at a rate of 60 kg/ha = 60/0.15 = 400 Kg of fertilizer

d. Potassium at a rate of 60 kg/ha = 60/0.1 = 600 Kg of fertilizer

Answer:

I don't understand snap the equation and send it

Answer:

The leaf would be made up of cells, but the root would not be made up of cells. The root would be made up of cells, but the leaf would not be made up of cells.

If a biologist examined a small piece of leaf and a small piece of root then she observed that the root will not contains cells but a leaf contains cells.

What does a biologists do?

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The new volume of the gas sample is approximately 3.6 L.

According to the ideal gas law, PV = nRT, where P is pressure, V is volume, n is the number of moles of gas, R is the gas constant, and T is temperature in Kelvin. If pressure is constant, we can use the formula V1/T1 = V2/T2 to find the new volume of the gas sample.

V1/T1 = V2/T2

V2 = (V1 x T2)/T1

V2 = (3 L x 300 K) / 250 K

V2 = 3.6 L

Therefore, the new volume of the gas sample is approximately 3.6 L. As the temperature of the gas sample increased from 250 K to 300 K, the volume increased proportionally since pressure was held constant.

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Structure A represents the arrangement of atoms in pure copper because  copper is a solid and only made of one type of atom.

The chemical element copper has the atomic number 29 and the symbol Cu. Copper, a transition metal, is a solid at ambient temperature.

Pure copper has a low hardness, is exceedingly ductile, and is malleable. For electrical applications, a number of reasonably pure Cu grades are produced, with small variances in deoxidation.

Solid copper is defined as a face-centered-cubic (fcc) arrangement of copper atoms.

Thus, structure A correctly represents the arrangement of atoms in pure copper.

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The concentration of the chloride ion. I got 0.9 M is  mathematically given as

[CL^-]=0.9mm

The reactants are listed on the left side of a chemical equation, while the products are listed on the right. Both sides of a balanced chemical equation have the same number of atoms of each element and the same overall charge.

Generally, the chemical equation for the question  is  mathematically given as

b) If the solution is \($\mathrm{Fe}_{3}(a \omega)$\)

\(\begin{aligned}\mathrm{FCl}_{3} & \rightarrow \mathrm{a}^{+3}+3 \mathrm{Cl}^{-} \\& 1 \mathrm{Fe}^{+3} \mathrm{~S} 3 \mathrm{al} \text { ions incota. } \\\Rightarrow\left[\mathrm{El}^{-}\right] &=\frac{3}{4} \mathrm{Cl}^{-}+4 \mathrm{Cl}^{-} \\therefore\left[\mathrm{Cl}^{-}\right] &=1.2 \mathrm{~mm} \times \frac{3}{4} \\&=0.9 \mathrm{~mm}\end{aligned}\)

In conclusion, the concentration of the chloride ion. I got 0.9 M is

[CL^-]=0.9mm

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Answer:

How do amoeba respire.

Define Diffusion.

Answer: 0.375L

Explanation: Using M1V1=M2V2, we can solve for V1.

12M*V1=1.5M*3.0L

V1 = \(\frac{1.5M*3.0L}{12M}\)

V1 = 0.375L.

0.375 L volume of the solution she needed to prepare 3.0 L of a 1.5 M HCl solution.

A homogenous mixture of one or more solutes that have been dissolved in a solvent is known as a solution. The material that a solute dissolves in to create a homogenous mixture is known as a solvent.

The component that dissolves in a solvent to create a homogenous mixture is known as a solute.

M₁ is the initial concentration of HCl solution = 12.0 M

V₁ is the volume of initial HCl solution that is needed

M₂ is the final concentration of HCl solution = 1.5 M

V₂  is the final volume of HCl solution to be prepared = 3.0 L

To find V₁, we get

V₁ = (M₂ V₂) / M₁

calculating the values, we will get:

V₁ = 1.5 M x 3.0 L / 12.0 M

= 0.375 L

Therefore, tech required to take 0.375 L of the 12.0 M HCl solution and dilute it to  3.0 L to make a 1.5 M HCl solution.

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Answer:

1.29

Explanation:

You have to find the equation which is d=m/v. d is 9.43=12.2/v. You have to solve for v which you get 1.29

1.29 \(cm^3\) is the volume of a 12.2 g piece of metal with a density of 9.43 g/cm.

Density is the measurement of how tightly a material is packed together.

Density =Mass ÷ volume

9.43=12.2 ÷  V

V = 1.29 \(cm^3\)

Hence, 1.29 \(cm^3\) is the volume of a 12.2 g piece of metal with a density of 9.43 g/cm.

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Answer:

I think this is because math and chemistry go together and the math problems are science related.

Explanation:

Answer: The calcium ion has a 2+ charge and the phosphate ion has a 3- charge.

To determine the hardness of the water sample prepared by dissolving 1.02 grams of CaCl2 in 750 ml distilled water, we need to calculate the concentration of calcium ions (Ca2+) in the solution, since hardness is usually defined as the concentration of calcium and magnesium ions in water.

The molar mass of CaCl2 is 110.98 g/mol, so 1.02 g of CaCl2 represents:

1.02 g / 110.98 g/mol = 0.00918 mol

When CaCl2 dissolves in water, it dissociates into two ions of Ca2+ and two ions of Cl-. Therefore, the number of moles of Ca2+ ions in the solution is:

0.00918 mol CaCl2 x (1 mol Ca2+ / 1 mol CaCl2) = 0.00918 mol Ca2+

The volume of the solution is 750 ml, which is equivalent to 0.75 L. Therefore, the concentration of Ca2+ ions in the solution is:

0.00918 mol / 0.75 L = 0.0122 M

Finally, we can convert the concentration to units of hardness, which is usually expressed in terms of milligrams of CaCO3 per liter (mg/L). The conversion factor is:

1 mmol CaCO3/L = 100 mg CaCO3/L

Since the molar mass of CaCO3 is 100.09 g/mol, we can calculate the hardness as:

0.0122 mol/L x (1000 mmol/mol) x (100 mg CaCO3/mmol) = 122 mg/L

Therefore, the hardness of the water sample prepared by dissolving 1.02 grams of CaCl2 in 750 ml distilled water is 122 mg/L.