What is the oxidation number of phosphorus in red phosphorus?

Answer:

vibrate

Explanation:

im smart trust me

Answer:

vibrate

Explanation:

its simple

250 L of 5.0% w/v glucose solution can be prepared using 125 g of glucose.

w/v = [ mass of solute (g) / volume of solution (mL) ] × 100

5.0 % w/v = [ 125 g / volume of solution (mL) ] × 100

volume of solution (mL) = [ 125 g / 5.0 % w/v ] x 100

volume of solution (mL) = [ 125 g / (5.0 / 100) ] x 100

volume of solution (mL) = [ 125 g / 0.05 ] x 100

Answer:

The answer is "\(7.90 \ g\)".

Explanation:

Please finds the complete question in the attached file.

\(Volume = 10.0 \ mL \\\\Density =0.79 g\ cm^3\)

\(\text{Density}=\frac{Mass}{Volume}\)

\(Mass = Density \times Volume\)

         \(=(0.790 g\ cm^3) \times 10.0 \ mL\\\\=7.90 \ g\)

The mass of acetone to be weighed is \(7.90 \ g\)

Answer:

When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphide is obtained and the sulphuric acid so formed remains in the solution. In this reaction, cupric ions (from copper sulphate) combine with sulphide ions (from hydrogen sulfide) to form cupric sulphide.

Answer:

When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphide is obtained and the sulphuric acid so formed remains in the solution. In this reaction, cupric ions (from copper sulphate) combine with sulphide ions (from hydrogen sulfide) to form cupric sulphide.

Explanation:

Answer:

6-

Explanation:

the total oxide ion charge in the formula unit is 6-

Answer:

The answer is 6-

Explanation:

correct :)

Answer:

right now we are using energy by online learning on our laptops , air conditioning, and transportation

Explanation:

A salesforce solution to accountability concerns is to ensure that salespeople are aware of the ethical and regulatory framework for their markets, including cultural and worldwide market variances.

Sales managers have the right to discipline salesmen. As a result, they are often able to sway salespeople without resorting to coercion, threats, or promises.

One of a sales manager's most crucial responsibilities is inspiring the team. He needs to organise his team so that they work together as a single unit to achieve a common goal. He is responsible for making sure the team members get along well and don't fight.

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Dinitrogen pentaoxide ===> nitrogen + oxygen

Dinitrogen pentaoxide = N2O5

Nitrogen (remember diatomic) = N2

Oxygen (remember diatomic) = O2

The reaction:

N2O5 ===> N2 + O2

To balance, we must have the same number of atoms on both sides.

So, you must add some numbers in front of each molecule.

Answer: 2 N2O5 ===> 2 N2 + 5 O2 (the balanced reaction)

Answer:

The statements that are true about unstable isotopes are:

They are radioactive.

They have an imbalance between protons and neutrons.

They may decompose.

Explanation:

An isotope is an atom that has the same number of protons as other atoms of the same element but a different number of neutrons. Some isotopes are stable, meaning they do not undergo any changes over time, while others are unstable or radioactive.

Unstable isotopes have an imbalance between the number of protons and neutrons in the nucleus, which makes them unstable and prone to breaking apart or decomposing. This process is called radioactive decay, and it can result in the emission of alpha or beta particles, gamma radiation, or other forms of energy.

The instability of the nucleus is due to the strong nuclear force that holds the nucleus together, which is overcome by the electrostatic repulsion between the protons. As a result, unstable isotopes are constantly trying to reach a more stable state by releasing energy in the form of radiation.

Because unstable isotopes can decompose, they have a limited lifespan, and their half-lives can vary from fractions of a second to billions of years. This property of unstable isotopes makes them useful in many fields, including medicine, geology, and nuclear energy.

Answer:

Explanation:

The statements that are true about unstable isotopes are:

They are radioactive.

They have an imbalance between protons and neutrons.

They may decompose.

Considering the definition of ideal gas law, the amount of Ar present is 0.00702 moles.

An ideal gas is a set of atoms or molecules that move freely without interactions. The pressure exerted by the gas is due to the collisions of the molecules with the walls of the container. Ideal gas behavior occurs at low pressures. At high pressures the molecules interact and intermolecular forces cause the gas to deviate from ideality.

The pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:

P×V = n×R×T

Where:

In this case, you know:

Replacing in the definition of ideal gas law:

1.4 atm× 0.155 L = n×0.086 (atmL)÷(molK)× 359 K

Solving:

[1.4 atm× 0.155 L] ÷ [0.086 (atmL)÷(molK)× 359 K]= n

0.00702 moles= n

Finally, there are 0.00702 moles of Ar.

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Answer: 2

Explanation:

Artificial transmutation occurs when nuclides are bombarded by particles like alpha particles or beta particles.

To calculate the moles of H+ and OH-, you need to know the concentration of the solution in terms of its pH or pOH value.

When you get the pH of the solution, you can use this formula to calculate the concentration of H+ ions: [H+] = 10^(-pH)

Also, if you know the pOH of the solution, you can use this formula to calculate the concentration of OH- ions: [OH-] = 10^(-pOH)

Having determined the concentration of H+ and OH- ions, the molarity formula can be used to calculate the number of moles of each ion as follows: moles = concentration (in mol/L) x volume (in L)

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Ionic bonds form between metals and nonmetals.

Ionic bonds, also known as electrovalent bonds, are a type of linkage created in a chemical molecule by the electrostatic attraction of ions with opposing charges. When the valence (outermost) electrons of one atom are permanently transferred to another atom, a bond of this kind is created.

If an atom receives electrons, it becomes a negatively charged ion (anion), but if it loses them, it becomes a positively charged ion (cation).

An ionic bond is essentially the most extreme form of a polar covalent bond, with the latter occurring when electrons are shared unevenly as opposed to fully. Covalent bonds arise when the electronegativities of the two atoms are similar, but ionic bonds often form when there is a large difference. Covalent bond is compared.

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The relative atomic mass of the sample of rubidium is approximately 48.6.

To calculate the relative atomic mass of the sample of rubidium using the given information, we can use the following steps:

Calculate the contribution of each isotope to the average atomic mass based on their abundance:

Isotope 1: Relative abundance = 72%, Mass number = 48

Isotope 2: Relative abundance = 28%, Mass number = 50

Contribution of isotope 1 = (72/100) * 48

Contribution of isotope 2 = (28/100) * 50

Sum the contributions of each isotope to obtain the average atomic mass:

Average atomic mass = Contribution of isotope 1 + Contribution of isotope 2

Calculate the values for the contributions and sum them up.

Round the average atomic mass to the appropriate number of significant figures.

Let's perform the calculations:

Contribution of isotope 1 = (72/100) * 48 = 34.56

Contribution of isotope 2 = (28/100) * 50 = 14.00

Average atomic mass = Contribution of isotope 1 + Contribution of isotope 2

Average atomic mass = 34.56 + 14.00 = 48.56

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The molar mass of MgCrO4 is approximately 140.30 g/mol.

To determine the molar mass of MgCrO4 (magnesium chromate), we need to calculate the sum of the atomic masses of each individual element in the compound.

The chemical formula MgCrO4 indicates that the compound consists of one magnesium atom (Mg), one chromium atom (Cr), and four oxygen atoms (O).

The atomic masses of the elements can be found on the periodic table:

Magnesium (Mg) has an atomic mass of approximately 24.31 g/mol.

Chromium (Cr) has an atomic mass of around 51.99 g/mol.

Oxygen (O) has an atomic mass of about 16.00 g/mol.

Now, we can calculate the molar mass of MgCrO4 by summing up the atomic masses of each element, considering the respective subscripts:

Molar mass = (Atomic mass of Mg) + (Atomic mass of Cr) + 4 × (Atomic mass of O)

Molar mass = (24.31 g/mol) + (51.99 g/mol) + 4 × (16.00 g/mol)

Molar mass = 24.31 g/mol + 51.99 g/mol + 64.00 g/mol

Molar mass ≈ 140.30 g/mol

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Answer:

1.092

Explanation:

Density = 1.0192 g/mL

oecific gravity = ?

Specific gravity is the ratio of a material's density with that of water.

The density of water at 4 degrees Celsius =  1 g/mL

Specific gravity = 1.0192 / 1 = 1.0192

Because specific gravity is a ratio, it has no dimension.

Answer:

An acid with Kg = 1.3 times 10-10.

Explanation:

The formula for pH of a buffer solution is as follows

pH = pKa + log [ A⁻ ] / [ HA ]

HA is acid concentration and A⁻ is concentration of conjugate base .

Generally the the second term is very small so neglecting this figure

pH = pKa

9.8 = pKa

If Ka = 10⁻¹⁰ x 1.3

pKa = - log ( 10⁻¹⁰ x 1.3 )

= 10 - log 1.3

= 9.8 approx .

Hence option F is correct .

The hydrogen ion concentration in the acid rain is 10 times higher than the HI concentration in the rain which is naturally acidic. Option D.

The pH scale is logarithmic, which means that a change of one pH unit represents a ten-fold change in hydrogen ion concentration.

Rainwater that is naturally acidic and has a pH of 5.6 has a hydrogen ion concentration of \(10^{5.6\) moles per liter.

Acid rain with a pH of 4.6 has a hydrogen ion concentration of \(10^{4.6\) moles per liter.

Therefore, the ratio of H+ concentration in acid rain to that in naturally acidic rain can be calculated as:

[H+] in acid rain / [H+] in naturally acidic rain = 10^(-4.6) / 10^(-5.6) = 10^(1) = 10

This means that the concentration of hydrogen ion in acid rain with a pH of 4.6 is 10 times higher than the concentration of H+ in rain that is naturally acidic and has a pH of 5.6.

In other words, the hydrogen ion concentration in the acid rain is 10 times higher than the hydrogen ion concentration in the rain which is naturally acidic.

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This question is referred to an article providing several facts about Methyl tertiary-butyl ether (MTBE); however, it is required to identify and describe the author’s purpose for writing the article.

In such a case, it is possible for us to identify that both the environmental and economical affectations due to the leak of MTBE-containing gasoline to the soil and water in Santa Monica is the author's purpose for writing the article.

Thus, we can see how the author describes the problems the population had due to the aforementioned leak and how they pretended to make oil companies (ExxonMobil, Chevron Corporation, and Shell) to account for the disaster and pay for it, both economically and environmentally, and provide drinking water to the affected population.

Moreover, it describes the removed amount of this pollutant from the soil and groundwater, some of the available methods to do so, and why it was banned as a fuel additive, not only in California, but also in other States in order to diminish its environmental and health impacts, even when there is a threshold of 20-40 parts per million in drinking water.

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Answer:

The waters' temp increased

Explanation:

The temperature of the water in the swimming pool has increased due to the heat from the Sun. As a result, the particles in the water are moving faster and have a higher kinetic energy than in the morning.

we are given the molarity and the volume of solution. The only issue is that the volume is given in mL instead of L. This issue can be fixed by using the following conversion factor:

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

1000

m

L

=

1

L

Therefore, if we divide 50mL by 1000mL we will obtain a value of 0.05L.

Next, the equation has to be rearranged to solve for the moles of solute:

Moles of solute = Molarity

×

Liters of solution

Now, multiply 0.360 M by 0.05:

0.360 mol

1 L

×

0.05 L

=

0.018 mol

To obtain the mass of solute, we will need to the molar mass of NaCl, which is 58.44 g/mol:

Finally, multiply the number of moles by 58.44 g/mol

0.018

mol

×

58.44

g

1

mol

Boom, here it is:

1.05

g

Answer:

.

Explanation:

A light-year is how astronomers measure distance in space. It's defined by how far a beam of light travels in one year – a distance of six trillion miles. Think of it as the bigger, badder cousin of the inch, the mile, the kilometer, and the furlong.

Answer:

A D-cell is a source of electric energy. A bulb is an energy receiver that produces light. To make a complete circuit, electricity must travel in a circle from one end of the battery to the other.

Explanation:

Answer:

synthesis

Explanation:

The reaction given is a synthesis reaction or combination reaction.

Given equation:

                        NH₃  +  HCl   →   NH₄Cl

In a synthesis reaction, a single product is formed from two or more reactants

                          A + B →  C

The formation of compounds from the union of constituent elements also falls into this category.

So the given reaction is a synthesis reaction.

In a decomposition reaction two or more products are formed from a single reactant

In a single replacement reaction, one substance replaces another.

In double replacement reactions partners in a chemical specie are exchanged.

Therefore the given reaction is a synthesis reaction

Answer:

Blood fractionation is the process of fractionating whole blood, or separating it into its component parts. This is typically done by centrifuging the blood. The resulting components are: a clear solution of blood plasma in the upper phase (which can be separated into its own fractions, see Blood plasma fractionation),

Answer: Centrifugal force is used to separate the components of blood – red blood cells, platelets and plasma – from each other. ... The red blood cells precipitate to the bottom of the bag, with the platelets above them, then the white blood cells and the plasma at the very top. Also because Each part of the blood has a different function. Separating the blood into parts lets patients get only the specific part or parts of the blood that they need. So a whole blood donation can be used for several patients.

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Explanation:

6.67 kJ of heat is required to melt 20 grams of ice.  To calculate the amount of heat required to melt a certain amount of ice.

we need to use the formula:

Q = n * ΔH_fus

where Q is the amount of heat required, n is the number of moles of ice, and ΔH_fus is the heat of fusion of ice.

To find the number of moles of ice in 20 grams, we need to divide the mass by the molar mass of ice. The molar mass of water is 18.015 g/mol.

n = m / M = 20 g / 18.015 g/mol = 1.110 mol

Now we can use the formula above to calculate the amount of heat required:

Q = n * ΔH_fus = 1.110 mol * 6.01 kJ/mol = 6.67 kJ

Therefore, 6.67 kJ of heat is required to melt 20 grams of ice.

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Answer

Ca(ClO₃)₂ → CaCl₂ + 3O₂

Procedure

Calcium chlorate decomposes to give oxygen and calcium chloride.

Calcium chlorate has a chemical formula of Ca(ClO3)₂, calcium chloride (CaCl₂), and molecular oxygen (O₂).

The reaction can be written as following

Ca(ClO₃)₂ → CaCl₂ + O₂

The equation is not balanced because the number of atoms of the oxygen element is not the same on both sides of the equation. The equation can be balanced by adding 3 as a coefficient for oxygen as follows:

Ca(ClO₃)₂ → CaCl₂ + 3O₂

Answer:

major ecological grouping of plants and animals

food chain

*biome*

bacteria and fungi that break down dead matter

*decomposers*

a state of change in which the end result is equal or

balanced

*dynamic equilibrium*

the basic relationships that show how a community of plants,

animals, and bacteria live and grow and how these living

*ecosystem*

things are dependent on each other as well as the Sun, soil,

and other nonliving parts of their environment; a cycle of

relationships

line of plants and animals that shows the order in which

*Food chain*

organisms are eaten

a condition or conditions of the nonliving surroundings, such

*environmental factor*

Explanation: