DUE TOMORROW

In each case below, the molecular formula for a compound is given. Determine the empirical formula for each compound.

The problem: When a 0.3546 g sample of vanadium metal is heated in air, it reacts with oxygen to achieve a final mass of 0.6330 g. Calculate the empirical formula of vanadium oxide.

Answer:

Positive: Save fuel and reduces greenhouse gas

Negative: Harmful to human and animal health ( underwater animals), Hurts the food chain

Explanation:

I got it from a video. Hopefully it helps you.

Answer:

yes it chemical to electrical to radiant energy

Explanation:

correct

Answer:

EtOH stands for ethyl alcohol, which is the type of alcohol found in alcoholic beverages such as beer, wine, and spirits. It is a central nervous system depressant that can cause a range of effects, from mild relaxation to severe impairment of cognitive and motor functions. EtOH is often used in the medical and research fields as a short notation for Ethanol.

EtOH is the chemical label or acronym for ethyl alcohol (ethanol). EtOH refers to the kind of alcohol that can be found in alcoholic beverages like wine, beer, and spirits.

It is a depressant of the central nervous system that can have a variety of effects, ranging from mild relaxation to severe cognitive and motor impairment. In the medical and research industries, EtOH is frequently used as a short notation for ethanol.

It is used in the production of other chemicals, as a solvent, and in alcoholic beverages. Ethanol is a colorless, somewhat toxic substance. Solutions of ethanol and water that contain more than 50% ethanol are extremely flammable. The most well-known use of ethanol is as alcohol in alcoholic beverages.

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Answer:

The correct answer on edge for 2021 is C. None.

Explanation:

We know this is correct because the solution is heterogenous after it has been stirred: the substance is not soluble in water.

The solution is heterogeneous after it has been stirred. The cornstarch is not soluble in water. Therefore, option C is correct.

Any mixture of one or more solutes that have been dissolved in a solvent is referred to as a solution. To create a homogenous mixture, a solute must dissolve in a solvent. To create a homogenous mixture, a solute must dissolve in a solvent.

Whereas homogenous mixtures seem consistent throughout, heterogeneous mixtures have clearly discernible components. A solution, which can be a solid, liquid, or gas, is the most typical kind of homogenous mixture.

No matter how you sample a homogenous solution, it often has the same characteristics. Sources of water, saline solution, certain metals, and bitumen are homogenous mixes. Examples of heterogeneous combinations are chicken noodle soup, sand, and oil, and water.

Thus, option C is correct.

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Approximately, 259.2 grams of potassium bromide can dissolve at 324 grams of water in 55 degrees

What is potassium bromide?

Potassium bromide is a salt that is formed from the elements potassium and bromine. It is a white crystalline solid with a salty taste and is soluble in water.

Potassium bromide has a wide range of applications, including its use as a medication to treat epilepsy and as a sedative for animals. It is also used in the production of photographic paper, as a flame and in the preparation of various chemicals.

Therefore, 259.2 grams of potassium bromide can dissolve at 324 grams of water in 55 degrees

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Answer:

Science

Explanation:

Answer:

d - orbital

Explanation:

The d-orbital can modelled by a peanut shape.

A peanut shape closely resembles the shape of a double dumb-bell shape. The double dumb-bell shape is like that of a peanut.

Therefore, since a peanut is like a double dumb-bell, it clearly models the d-orbital.

pCO2 is an important factor that affects various aspects of water chemistry and the impacts of ocean acidification. When pCO2 increases, the concentration of total CO2 dissolved in water also increases. This leads to changes in pH, which decreases due to increasing atmospheric CO2 concentration.

When pCO2 rises, the concentration of only CO2 dissolved in water increases. The dissolved CO2 forms carbonic acid, which contributes to the acidification of the ocean. This increase in CO2 affects the equilibrium between CO2, HCO3-, and CO3^2-, shifting it towards higher levels of dissolved CO2 and H+ ions, resulting in a lower pH.

In terms of the impacts of ocean acidification on different organisms, the effects can vary depending on their specific needs. An organism that requires CO2 is likely to fare better under ocean acidification since the increase in dissolved CO2 can provide them with a favorable environment. However, organisms that rely on HCO3- or CO3^2- may fare worse under ocean acidification, as the lower pH interferes with the availability of these carbonate ions, which are essential for shell formation and calcification in some marine organisms.

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Answer:

CH3COOH Ba OH 2 Ba CH3COO 2 H2O?

Explanation:

hope it helps you ~♥~

2.50 g of helium gas at STP would occupy a volume of 14.0 liters.

Standard temperature and pressure (STP) conditions of 0°C and 1 atm, we can use the molar volume of a gas at STP, which is 22.4 L/mol.

1. Helium seems to have a molar mass of 4.00 g/mol.

Therefore, we can calculate the number of moles of helium as:

moles of He = mass of He divided by molar mass of He

= 2.50 g / 4.00 g/mol

= 0.625 mol

Then, we can use the molar volume of a gas at STP to calculate the volume of helium gas:

volume of He = moles of He x molar volume of gas at STP

= 0.625 mol x 22.4 L/mol

= 14.0 L

2.50 g of helium gas at STP would occupy a volume of 14.0 liters.

2. The molar mass of sodium is 22.99 g/mol. Therefore, we can calculate the number of moles of sodium as:

moles of Na = number of atoms of Na divided by Avogadro's number

= 5.0 x 10²⁵ atoms / 6.022 x 10²³ atoms/mol

= 83.0 mol

Then, we can use the molar mass of sodium to calculate the mass of sodium:

mass of Na = moles of Na x molar mass of Na

= 83.0 mol x 22.99 g/mol

= 1900 g

Therefore, 5.0 x 10²⁵ atoms of sodium have a mass of 1900 g.

3. The molar mass of Ni is 58.69 g/mol. Therefore, we can calculate the number of moles of Ni as:

moles of Ni = mass of Ni divided by molar mass of Ni

= 3.95 g / 58.69 g/mol

= 0.0673 mol

Then, we can use Avogadro's number to calculate the number of atoms of Ni:

number of atoms of Ni = moles of Ni x Avogadro's number

= 0.0673 mol x 6.022 x 10²³ atoms/mol

= 4.05 x 10²² atoms

Therefore, 3.95 g of Ni contain 4.05 x 10²² atoms.

4. The molar mass of Xe is 131.29 g/mol. Therefore, we can calculate the number of moles of Xe as:

moles of Xe = mass of Xe divided by molar mass of Xe

= 15 kg / 131.29 g/mol

= 114 mol

Then, we can use Avogadro's number to calculate the number of atoms of Xe:

number of atoms of Xe = moles of Xe x Avogadro's number

= 114 mol x 6.022 x 10^23 atoms/mol

= 6.87 x10²⁵ atoms

Therefore, a 15 kg sample of Xe gas contains 6.87 x 10²⁵ atoms.

5. A gas's molar volume at STP is 22.4 L/mol. Therefore, we can calculate the number of moles of Ar as:

moles of Ar = number of atoms of Ar divided by Avogadro's number

= 45,000,000 atoms / 6.022 x 10²³ atoms/mol

= 7.47 x 10⁻¹⁷ mol

Then, we can use the molar volume of a gas at STP to calculate the volume of Ar gas:

volume of Ar = moles of Ar x molar volume of gas at STP

= 7.47 x 10⁻¹⁷ mol x 22.4 L/mol

= 1.67 x  10⁻¹⁵ L

Therefore, 45,000,000 atoms of Ar would occupy a volume of 1.67 x 10⁻¹⁵ liters at STP.

6. The molar mass of CO₂ is 44.01 g/mol. Therefore, we can calculate the number of moles of CO₂ as:

moles of CO₂ = mass of CO₂ divided by molar mass of CO₂

= 75 g / 44.01 g/mol

= 1.70 mol

Then, we can use Avogadro's number to calculate the number of atoms of CO₂:

number of atoms of CO₂ = moles of CO₂ x Avogadro's number

= 1.70 mol x 6.022 x 10²³ atoms/mol

= 1.02 x 10²⁴ atoms

Therefore, a 75 g sample of CO₂ contains 1.02 x 10²⁴ atoms.

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Whereas physical changes entail a change in a substance's physical attributes without the creation of new substances, chemical changes involve the rearranging of atoms and the creation of new substances.

According to the concept of "The Lost Isle of Change," once a material experiences a chemical shift, it is difficult to restore it to its previous condition, much like an island that vanishes after it has sunk. Nonetheless, substances that are changing physically are frequently simple to reverse, much like an island that may reemerge as the sea recedes. In conclusion, physical changes frequently entail a change in physical attributes, whereas chemical changes involve the synthesis of new substances and are reversible. The irreversibility of chemical changes is symbolised by "The Lost Island of Change."

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Full Question

What is the difference between chemical and physical changes, and how do they relate to the concept of "The Lost Isle of change"?

January 19

Explanation:

every first 7 days of a month the moon roughly starts its full moon phase

The compound represented by the given bond line drawing has seven carbon atoms and two pi bonds.

The bond line drawing of a compound typically represents the skeletal structure of the molecule, where the carbon atoms and their connections to other atoms are implied by the lines. To determine the number of carbon atoms in the compound, we count the number of lines that connect to carbon. In this case, we can see that there are seven lines, which means that there are seven carbon atoms in the compound.

Pie bonds, also known as pi bonds, are formed by the overlap of two parallel p-orbitals, and they are typically represented by a double bond or a triple bond in a bond line drawing. To count the number of pi bonds in the compound, we look for double and triple bonds. In this bond line drawing, we can see that there are two double bonds, which means that there are two pi bonds in the compound.

Therefore, the compound represented by the given bond line drawing has seven carbon atoms and two pi bonds. It is important to note that while bond line drawings can provide a quick and efficient way to represent molecular structures, they may not always accurately reflect the three-dimensional geometry of the molecule.

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Answer:

0.25

Explanation:

volume= number of moles over concentration

hence v=1.5/6

Answer:

Elements make up a compound.

Answer:

Simple distillation

Answer:

Lines in the spectrum were due to transitions in which an electron moved from a higher-energy orbit with a larger radius to a lower-energy orbit with smaller radius. The orbit closest to the nucleus represented the ground state of the atom and was most stable; orbits farther away were higher-energy excited states.

Explanation:

There is an intimate connection between the atomic structure of an atom and its spectral characteristics. Atoms of individual elements emit light at only specific wavelengths, producing a line spectrum rather than the continuous spectrum of all wavelengths produced by a hot object. Niels Bohr explained the line spectrum of the hydrogen atom by assuming that the electron moved in circular orbits and that orbits with only certain radii were allowed. Lines in the spectrum were due to transitions in which an electron moved from a higher-energy orbit with a larger radius to a lower-energy orbit with smaller radius. The orbit closest to the nucleus represented the ground state of the atom and was most stable; orbits farther away were higher-energy excited states. Transitions from an excited state to a lower-energy state resulted in the emission of light with only a limited number of wavelengths Atoms can also absorb light of certain energies, resulting in a transition from the ground state or a lower-energy excited state to a higher energy excited state. This produces an absorption spectrum, which has dark lines in the same position as the bright lines in the emission spectrum of an element. Bohr's model revolutionized the understanding of the atom but could not explain the spectra of atoms heavier than hydrogen.

Pathogenic bacteria are the most problematic in the food industry. The term "pathogenic" refers to any bacteria that are capable of causing illness when consumed by humans or animals.

Option A is correct

Pathogenic bacteria are often found in foods that are not cooked or handled correctly. This includes raw meat, unpasteurized dairy products, and foods that are stored at incorrect temperatures for an extended period of time. It is crucial for food industry professionals to follow strict safety protocols to minimize the risk of pathogenic bacteria contaminating their products, leading to foodborne illnesses.Foodborne illnesses can be caused by a variety of microorganisms, including bacteria, viruses, and parasites. Pathogenic bacteria are a significant concern in the food industry, as they can cause serious illness and even death in vulnerable populations such as young children, pregnant women, and the elderly. The most problematic bacteria in the food industry are those that are pathogenic and are capable of multiplying quickly in the food environment. Pathogenic bacteria can cause food poisoning, which is a severe illness that can result in dehydration, fever, vomiting, and diarrhea.

The symptoms can be severe and can lead to hospitalization or even death if left untreated. The most common pathogenic bacteria found in food are Salmonella, Listeria, and E.coli. These bacteria are often found in raw or undercooked meat, unpasteurized dairy products, and fruits and vegetables that are not washed correctly. It is essential for food industry professionals to follow strict safety protocols to prevent the growth and spread of these bacteria. Proper handwashing, storage, and cooking techniques can help minimize the risk of foodborne illnesses caused by pathogenic bacteria. In conclusion, pathogenic bacteria are the most problematic in the food industry. Food safety protocols should be followed to minimize the risk of foodborne illnesses caused by these bacteria.

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Answer:

Heating a substance can cause the substance to change state

The way particles move changes when the substance's thermal energy changes.

Particles in all states of matter are constantly

moving.

Those are all correct and apply to water in all three phases

The mass of the liquid water that vaporizes when 7700 J of energy is absorbed at 100°C is approximately 170.8 grams.

To calculate the mass of the liquid water that vaporizes, we need to use the concept of specific heat and the heat of vaporization. At 100°C, water is already at its boiling point, so the heat absorbed will solely contribute to the phase change from liquid to vapor.

First, we calculate the heat required to vaporize the water using the formula Q = m × ΔHv, where Q is the energy absorbed, m is the mass of the water, and ΔHv is the heat of vaporization of water. The heat of vaporization for water is approximately 40.7 kJ/mol or 40.7 J/g.

Since we have the energy absorbed in joules, we convert it to grams by dividing by the heat of vaporization:

7700 J / (40.7 J/g) ≈ 189.2 g

However, not all the liquid water will vaporize. To find the mass of the vaporized water, we need to consider that the remaining liquid water will still be at 100°C. Using the specific heat capacity of water (4.18 J/g°C), we can calculate the mass of the vaporized water:

Q = m × c × ΔT

7700 J = m × 4.18 J/g°C × 100°C

m ≈ 18.4 g

The mass of the vaporized water is approximately 18.4 grams. To find the mass of the liquid water that vaporizes, we subtract the mass of the remaining liquid water from the initial mass:

189.2 g - 18.4 g ≈ 170.8 g

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In electron capture, an atomic electron is absorbed by a proton in the nucleus, turning the proton into a neutron. The electron starts as a regular atomic electron, with its wavefunction spreading through the atom and overlapping with the nucleus.

Hopefully this is helpful sorry for no explanation i am not good at explaining things

The plastic tube has a quantity of charge of -6.08 x 10⁻¹⁰ C and the vinyl balloon has a quantity of charge of -2.72 x 10⁻¹⁸ C

Quantity of charge refers to the number of charges (electrons) that go from a higher potential to a lower potential.

It denotes the entire quantity of electricity flowing via a conductor.

The charge on one single electron is therefore defined as  the fundamental unit of charge. Charge is a fundamental measurement which cannot be derived from any other measurements.  Charge is measured in units of Coulombs

For the plastic tube:

Quantity of charge = (3.80 x 10⁹ electrons) × (-1.60 x 10⁻¹⁹ C)

Quantity of charge = -6.08 x 10⁻¹⁰ C

For the vinyl balloon:

Quantity of charge = (1.70 x 10¹ electrons) × (-1.60 x 10⁻¹⁹ C)

Quantity of charge = -2.72 x 10⁻¹⁸ C

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Answer:

salad

Explanation:

Answer:

Invention

Explanation:

!Hope This Helps!

The oxidation number of nitrogen in the nitrate ion (NO₃⁻) is +5. To determine the oxidation number, we assign a hypothetical charge to each element in the compound based on its electronegativity and known rules.

In NO₃⁻, oxygen is assigned an oxidation number of -2, since it typically exhibits a -2 charge in most compounds. Since there are three oxygen atoms in NO₃⁻, the total charge from the oxygen atoms is -6.

The overall charge of the nitrate ion is -1, so the sum of the oxidation numbers of all the atoms in the ion must equal -1. Therefore, to balance out the charge, nitrogen must have an oxidation number of +5.

We can calculate this by using the equation:

(+5) + (-6) = -1

Hence, the correct answer is b. +5.

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Answer:

I believe your answer should be 1 because filteration is a process of removing solid particuless/ and or gasses of matter from the lake in this interpretation. and filtration is used to allow fluidly bodies through but not matter.

The process of filtration is working to remove residue from the lake water. The correct option is A.

Filtration is basically a physical separation method that utilize a filter medium along with a complex structure through that only fluid can pass to separate solid matter and fluid from a mixture.

Filtration is the process of separating suspended particles from a fluid by passing the fluid through a porous material while retaining the suspended particles.

It is the separation of solids from a fluid (liquid or gas) by passing it through a filtering device.

The various types of filtration are detailed below.

Thus, the correct option is A.

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When a balloon is rubbed against wall : A.) Electrons were transferred from wall to the balloon.

When a balloon is rubbed against a wall, electrons are transferred from the wall to surface of the balloon. This is because the rubbing action causes balloon to become negatively charged, while the wall becomes positively charged.

Electrons and protons are subatomic particles that make up atoms, which are the basic units of matter.

Electrons are negatively charged particles that orbit around the nucleus of atom and have a very small mass compared to protons and neutrons.

Protons are positively charged particles that are located in the nucleus of an atom.

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The Element 1 and Element 3 are metals, while Element 2 is a nonmetal

Why find will be element metal or nonmetal?

In the table below, descriptions of an experiment on samples of three different chemical elements are given Description Element 1Metal Moderately soft yellow solid.

A 5 cm x 5 cm square of it, only 1 mm thick, is heated with a flame at one end.

Where the flame touches the square, the sample rapidly turns red and starts to melt, but the rest of the square remains cool to the touch.

Element 2 Nonmetal Faintly yellow gas.

100 cm of the gas are compressed to a new volume of 10 cm.

When the compressed gas is allowed to leak out through a small hole, it becomes warmer. Element 3 MetalHard silvery-gray solid. A 10. g cube of it is set on a hot 50 °C plate.

After 1 minute, the temperature of the top of the cube has risen by 2.2 °C.

The have been highlighted above in bold letters. It is quite clear that Element 1 and Element 3 are metals, while Element 2 is a nonmetal.

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