What is the freezing point in °C of a 2. 20 molal solution of calcium chloride in water?

The value of the H-C-H bond angle in ethylene is 117°.

The bond angle is a geometric angle that is formed due to the repulsion between atoms or electrons in a bond. The binding angle for a linear molecule is 180°, for a triangular planar molecule it is 120°, and so on.

The size of the bond angle is affected by the magnitude of the repulsive force of electron pairs in the molecule. The lone pair has a slightly stronger repulsive force than the bonding pair. This happens because the lone pair of electrons is only bound to one atom, so the movement is more flexible.

Determine the bond angles using VESPR theory, such as if the shape of the molecule AX means that it is linear with a bond angle of 180 degrees.

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A student heats 95.37 grams of copper to 99.24 °C and then drops it into a cup containing 78.54 grams of water at 22.14 °C She measures the final temperature to be 29.85 °C .  The calorimeter constant  is 1°C.

Given that :

Mass of copper = 95.37 g

Heat capacity = 0.44 J/ g °C

Temperature = 99.24 °C

Final temperature =  29.85 °C

Q copper = m c × ΔT

                = 95.37 × 0.44 × -69.39

                =  - 2773.8 J

Mass of water = 78.54 g

Heat capacity = 4.18 J/g °C

Q = 78.54 × 4.18 × 7.71

Q = 2787.6J

Q calorimeter = 13.8 J

Calorimeter constant = 13.8 J / 7.71 °C

                                   = 1 °C

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The mass of liquid oxygen needed to burn 134.8 g of B2H6 is 84.41 mL LOX.

Liquid oxygen is a form of oxygen in its liquid state. It is a colorless, odorless, and highly reactive substance that is composed of two oxygen atoms bonded together. It can be made by cooling oxygen gas in a cryogenic process to temperatures below -297°F (-183°C).

The combustion reaction of diborane requires 3 moles of oxygen for every 1 mole of diborane, so the mass of oxygen required to burn 134.8 g of B2H6 (1 mole) is:
3 moles of O₂ x (32.00 g/mol O₂) = 96.00 g of O₂
Since liquid oxygen (LOX) has a density of 1.141 g/mL, the mass of liquid oxygen needed to burn 134.8 g of B2H6 is:
96.00 g O₂ ÷ 1.141 g/mL = 84.41 mL LOX

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In 1 angle AOD is an obtuse angle and is 110°  and angle GOD is an acute angle and it is 70°.

90 degrees is the standard for a right angle. Any angle that is less than 90 degrees is called acute, and any angle that is larger than the 90 degrees is called obtuse.

Follow the instructions below to use a protractor to measure an angle. Align the angle's vertex with the protractor's dot in the center. Set the protractor such that one angle's side is parallel to 0 degrees. Find the point where the angle's opposite side crosses the number scale by reading the protractor.

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Lewis dot structure is given in photo .

What is lewis dot structure ?

A Lewis point structure is a type of diagram used to show the distribution of electrons within a molecule or ion. This structure was first introduced in 1916 by chemist Gilbert N. Lewis. The structure consists of dots representing electrons surrounding the chemical symbols of the atoms in the molecule, indicating the number of bonds each atom can form. The dots are placed in pairs around the element symbol and represent the valence electrons (the electrons at the outermost energy level) of that element. The number of valence electrons of an element can be obtained from the periodic table.

Lewis point structures are used to predict the number and type of bonds that form between atoms in a molecule and to predict the shape of the molecule. By connecting the points of different elements in a molecule, the lewis structure can be used to determine the bond order, or the number of bonds between two atoms. Information about bond order, combined with the arrangement of atoms in space, can be used to determine the molecular structure of a molecule.

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Everyday, save water. Reduce the length of your showers, patch any leaks, and switch off the flow when you're not using it. Instead of disposing of hazardous household chemicals into the drain, transport them to the a hazardous waste facility. Use resilient plants in your yard that require little to no watering, fertilizer, or pesticides.

Arthropods, including insects, are killed by insecticides. Mites can feed on both plants and animals are eliminated with miticides, also known as acaricides. Microorganisms known as microbial pesticides can kill, prevent, or outcompete pests like insects or even other microorganism pests.

Pesticides can have both acute, or short-term, negative health impacts, and chronic, or long-term, consequences, which can develop years or months after exposure. Examples of immediate health consequences include eye stinging, blisters, rashes, blindness, nausea, lightheadedness, diarrhea, and even death.

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Answer: The answer is : using a broom, and picking up litter  and pet waste.

Explanation: I just took the test and got a 100%,! that was my answer.

This battery could be made stronger when we make lithium the anode and make zinc the cathode.

We know that the term electron affinity has to do with the fact the a specie is able to attract electrons. Hence, the specie that can be able to attract electrons is said to be have a greater electron affinity.

If we look at the order of the reactivity of the metals, we can see that the lithium has more tendency to exist as a positive ion as such the electron affinity of the lithium atom is very negative and it does not attract electrons.

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It is equal to the total mass of carbon dioxide and water used" as the substrates (CO2 and H2O) are just merely converted to the products (C6H12O6 and O2) with no mass being consumed or used as fuel for the reaction. In this reaction, energy is well conserved. The correct option is B

Photosynthesis can be defined as the process by which green plants and certain other organisms transform light energy into chemical energy. During photosynthesis in green plants, light energy is captured and used to convert water, carbon dioxide, and minerals into oxygen and energy-rich organic compounds.

Therefore the primary function of photosynthesis is to convert solar energy into chemical energy and then store that chemical energy for future use.

The balanced equation of photosynthesis is: 6CO2 + 6H2O + light energy = C6H12O6 + 6O2.

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Answer: part 1 of 2

1. The amount required of H₂ = 11.0 g.

2. The amount required of O₂ = 88.0 g.

Explanation:

The balanced equation for the mentioned reaction is:

2H₂(g) + O₂(g) → 2H₂O,

It is clear that 2.0 moles of H₂ react with 1.0 mole of O₂ to produce 2.0 moles of H₂O.

Q1: How much hydrogen would be required to produce 5.5 mol of water?

Using cross multiplication:

2.0 mol of H₂ produce → 2.0 mol of H₂O, from stichiometry.

??? mol of H₂ produce → 5.5 mol of H₂O.

∴ the no. of moles of H₂ needed to produce 5.5 mol of water = (2.0 mol)(5.5 mol)/(2.0 mol) = 5.5 mol.

Now, we can get the mass of H₂ needed to to produce 5.5 mol of water:

mass of H₂ = (no. of moles)(molar mass) = (5.5 mol)(2.0 g/mol) = 11.0 g.

Q2: How much oxygen would be required?

Using cross multiplication:

1.0 mol of O₂ produce → 2.0 mol of H₂O, from stichiometry.

??? mol of O₂ produce → 5.5 mol of H₂O.

∴ the no. of moles of O₂ needed to produce 5.5 mol of water = (1.0 mol)(5.5 mol)/(2.0 mol) = 2.75 mol.

Now, we can get the mass of O₂ needed to to produce 5.5 mol of water:

mass of O₂ = (no. of moles)(molar mass) = (2.75 mol)(32.0 g/mol) = 88.0 g.

A link between hydrogen and sulfur is created by sharing the one electron that hydrogen possesses. In its association with sulfur, there isn't another atom. In order to complete the octet, the sulfur atom has a .

Methane, widely known as natural gas, has a healthy substitute in hydrogen. According to estimates, it makes about 75% of the universe's mass and is the most prevalent chemical element. Huge quantities of hydrogen atoms are present on earth in water, plants, animals, and, of course, people.

The sun and the majority of stars include it, while Jupiter is primarily made of it. The most prevalent form of hydrogen on Earth is water. Just under 1 part per million by volume, it only exists as a gas in trace concentrations in the atmosphere.

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Resonance structures of cycloserine can be produced with the help of rotating arrows, produced with a carbocation in step 1 and the resultant resonance structure in step 2 after the double faced arrow.

An antibiotic called cycloserine was discovered in the bacterium Streptomyces orchidaceous. When treating tuberculosis, it is used with other medications. To depict the motion of the electrons in the "original" resonance structure, use curved arrows. By following the arrows, the "new" resonance structure should be a "product" that is automatically created. It will have two resonance structures as depicted in the image attached. Carbocation produced is the step 1 and the resultant compound is the step 2 in the image.

Resonance structures are collections of Lewis structures that explain how the electrons in a polyatomic ion or molecule become delocalized. Because molecules and polyatomic ions frequently have partial charges and fractional bonds, a single Lewis structure frequently falls short of explaining the bonding in a molecule or polyatomic ion.

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Answer:

Explanation:

Sound energy: Crowd cheering

Chemical energy: Body converts nutrients into energy to run

Mechanical energy: The camera filming the photo

The acceleration of the objection is 0.9375 m/s² if the players still push with a force of 150 N.

From the formula:

F = ma

a = F/m

a = 150/160

a = 0.9375 m/s²

Thus, the acceleration of the object is 0.9375 m/s² if the players still push with a force of 150 N.

The word 'force' has a very precise meaning. Force can be described as push or a pull. A force is not something that an object contains or has in it. A force is exerted on one object by another. The idea of a force is not confined to living things or non-living things.

The SI unit of force is the newton, symbolised as N. The base units suitable to force are: metre, unit of length — symbol m. The kilogram, unit of mass — symbol kg. The second, unit of time — symbol s.

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The acceleration of the objection is 0.9375 m/s² if the players still push with a force of 150 N.

The word 'force' has a very precise meaning. Force can be described as push or a pull. A force is not something that an object contains or has in it. A force is exerted on one object by another. The idea of a force is not confined to living things or non-living things.

From the formula:

F = ma

a = F/m

a = 150/160

a = 0.9375 m/s²

Thus, the acceleration of the object is 0.9375 m/s² if the players still push with a force of 150 N.

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The origin of replication (ORI) is a specific location on a DNA molecule where replication, the process of duplicating the DNA, begins.

The ORI is a unique sequence of nucleotides that serves as a starting point for the replication machinery. The ORI is where the replication enzymes bind, helicases, premises, and polymerases that unwind initiate, and elongate the replication process.

In prokaryotes, the ORI is often a specific sequence known as the replication origin sequence (oriC), which is conserved among different bacterial species. In eukaryotic cells, replication origins are dispersed throughout the chromosomes, and the exact location and mechanism of initiation are still not completely understood.

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The molality of the solution is 3.125 m.

Let us recall that the boiling point of the solution is one of the colligative properties and the implication of this is that it depends on the amount of the substance that we can find in the solution.

Note that;

ΔT = K m i

ΔT =  Boiling point elevation

K = boiling constant

m = molality

i = Vant Hoff factor

Then;

ΔT = 101.6 - 100.0

= 1.6°C

Thus;

1.6 = 0.512 * m * 1

m = 1.6/0.512

m = 3.125 m

Thus the molality is 3.125 m

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Based on the relationship between the number of turns of the coils and the strength of an electromagnet, the true options are:

The hypothesis was supported by the results of the experiment:

The correct option is II only.

The strength of the electromagnet rises with the number of turns in the coil.

This is due to the fact that as the coil "cuts" through the magnetic field, the sum of the individual emf s created by each turn increases with the number of coils turns.

The relative speed between the coil and magnet, as well as the magnet's strength, are additional elements that influence the strength of the induced current in a dynamo in addition to the number of coils. The intensity of the generated current increases with magnet strength and relative speed.

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Answer: pears,  oatmeal, green beans, corn, oranges, black beans,bananas, asparagus

An example of the bimolecular elimination from the isomeric halogenated compound would be of Dehalogenation of 1,2-dibromoethane to form ethene and hydrogen bromide: H3C-CH2-Br2 --> H2C=CH2 + HBr.

Bimolecular elimination is a chemical reaction where two molecules react to form a new molecule and a neutral molecule. Isomeric halogenated compounds are compounds that have the same molecular formula but different structural arrangements.

For example, 1,2-dibromoethane and 1-bromo-2-chloroethane are isomers. Bimolecular elimination of these compounds can produce ethene and hydrogen halide (HBr or HCl) as the products. The specific product will depend on the isomeric halogenated compound and the reaction conditions.

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Answer:

0.32 moles of H2

Explanation:

I will assume the question concerns the production of water from hydrogen and oxygen(?).  If theis is correct, start with a balanced chemical reaction.

O2 + 2H2 = 2H2O  

2 O and 4 H on both sides of the reaction: it is balanced.

The balanced equation tells us we need 2 moles of H2 for every 2 moles of H2O, a 1:1 molar ratio.  If we want 4 moles of H2O, we'd need 4 moles of H2.

If we want 0.32 moles of H2O, we need 0.32 moles of H2.

According to the bohr model of the atom, the single electron of a hydrogen atom circles the nucleus is specific allowed orbits.

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Answer:

The conversion of one form of energy into another, or the movement of energy from one place to another.

Explanation:

hope this helps

The number of Nitrogen molecules required to make 2 * 10^10 molecules of Ammonia is 3 * 10^10. Hence, the correct option is option A.

We are already aware of the simple molecular reaction between hydrogen, nitrogen which produces ammonia which goes as thus -

= N₂+3H₂ = 2NH₃

This molecular reaction tells us that one mole of nitrogen reacts with three moles of hydrogen in order to create two moles of ammonia.

Here, it is given that we have 2 * 10^10 molecules of Ammonia (NH₃).

We also know the formula = No. of atoms/ Avogadro Number = No. of moles

Hence, we can write that -

= No. of atoms of Nitrogen/ 6.022 * 10^23 = 2(2 * 10^10/6.022 * 10^23)

= No. of atoms of Nitrogen/ 6.022 * 10^23 = 0.6 * 10^-13

=  No. of atoms of Nitrogen =  0.6 * 10^-13 * 6.022 * 10^23

= No. of atoms of Nitrogen = 3.6 * 10^10 atoms

This can be rounded off to 3 * 10^10. Hence, option A is the correct option.

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Answer:

C) 100 kPa

The total pressure exerted by a mixture of gases is equal to the sum of the partial pressures of each individual gas. In this case, the partial pressure of the first gas is 70 kPa and the partial pressure of the second gas is 30 kPa. Therefore, the total pressure exerted by the mixture is 70 kPa + 30 kPa = 100 kPa. The answer is C) 100 kPa.

Explanation:

Yellow color  represent  590 nm.

The atoms in a cold, diluted gas absorb light at particular frequencies, producing an absorption spectrum. Black lines (absence of light) are produced in the spectrum because the re-emitted light is unlikely to travel in the same direction as the absorbed photon.

When switching between two states, an atom, ion, or molecule absorbs photons with energies equal to the difference in the energies of the two states. The outcome is an absorbance spectrum showing the intensity of emission as a function of wavelength.

There are two types of absorption processes: chemical and physical, depending on whether the solute and solvent undergo a chemical reaction.

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Answer:

Venus

Explanation:

From the sun outwards is   Mercury   Venus  Earth  and then Mars

Answer: carbon element

Explanation:

this is it

The antibiotic mycomycin has seven sp3, sp2, and sp hybridized carbons in its structure. There are a total of seven hybridized carbons in the molecule.

The antibiotic mycomycin is a type of polyketide antibiotic produced by the bacterium Streptomyces mycomyceticus. It is used to treat various infections, including those caused by bacterial parasites, fungi, and protozoa. Mycomycin works by inhibiting the formation of bacterial cell walls, leading to the death of the infected cells. It is effective against a wide range of bacteria, including Gram-positive and Gram-negative bacteria, as well as some fungal species.

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The number of orbital in the third principal energy level nine.

What is principal energy level?

Principal energy level is a space that divide nucleus atom into a region with a certain levels. each of them has one sub level that contain only one s- orbital. In the s- orbital, the total electron available is 2 and determine as the lowest level because it is contain the lowest electrons. Each principal energy level after first energy level has one s- orbital with 3 p-orbital. Hence the third principal energy level contain 1 s- orbital, 3 p-orbital and 5 d-orbital or 1 + 3 + 5 total orbital. So, the total orbital of this level is 9.

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1. Calcium has an atomic number of 20 and phosphorus has an atomic number of 15, while radium has an atomic number of 88. This can be used to determine which element was most likely deposited in the workers' bones in place of calcium.

2. Calcium. This is because calcium is an element with an atomic number of 20, meaning it has 20 protons in its nucleus. It is also found in abundance both in the human body and in many foods, making it easy to obtain and store in the body.

Characteristics of Calcium Ions:

- Has a charge of +2

- Located in column 2 of the periodic table

- Atomic number of 20

Reasons it could be Phosphorus:

- Has a charge of +3

- Located in column 3 of the periodic table

- Atomic number of 15

Reasons it couldn't be Phosphorus:

- Has a higher charge than calcium

- Has a different atomic number than calcium

Reasons it could be Radium:

- Has a charge of +2

- Located in column 7 of the periodic table

- Atomic number of 88

Reasons it couldn't be Radium:

- Has a different atomic number than calcium

- Is located in a far different column than calcium on the periodic table

Conclusion
Based on the evidence, it is likely that the source of the poisoning was radium, and from a chemistry perspective, the shop owners were responsible for exposing the workers to this element and, as such, are responsible for their illnesses.

Answer: orbit?

Explanation: