If a central atom of a molecule only has two electron domains, what is the bond angle associated with the molecule?
120o
180o
90o
109.5o

Answer:

It is different than most other phase diagrams due to the negative slope of the liquid-solid equilibrium line. The negative slope indicates that increasing pressure on the surface of ice causes it to melt. This is because ice is less dense than liquid water in the area of the liquid-solid equilibrium.

Explanation:

Answer: solid water is less than of liquid water

Explanation:because a solid has less density

Answer:

Based on the mass number of an element, one can determine the number of neutrons that element has. The identity of an element implies its number of protons, and thus one can subtract atomic number from mass number to determine the number of neutrons in the atom's nucleus.

Based on the mole ratio of the reaction, the mass of aluminum oxide that is produced from the reaction between 5 g of aluminum and 9g of oxygen is 9.39 g.

The mass of aluminum oxide that can be formed from the reaction between aluminum and oxygen is determined from the limiting reactant and the mole ratio of the reaction.

The mole ratio of the reaction is as given in the equation of the reaction below:

2 Al (s) + 3 O₂ (g) ----> Al₂O₃ (s)

The mole ratio of Al to O = 2 : 3

Moles of Al present = 5/27

Moles of Al present = 0.185 moles

Moles of O present = 9/32

Moles of Al present = 0.281 moles

Al is the limiting reactant

Mole ratio of Al to Al₂O₃ = 2 : 1

Mass of Al₂O₃ produced = 0.185/2 * 101.56

Mass of Al₂O₃ produced = 9.39 g

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Answer:

B

Explanation:

No explanation needed for it i got 100% on it

Lifting the remains is the last step in the excavation of the skeletal remains. Therefore, option E is correct.

In archaeology, excavation can be described as the exposure, processing, and recording of archaeological remains. An excavation site or "dig" can be the area being studied. These locations are from one to various areas at a time while a project can be conducted over weeks to several years.

Excavation involves the recovery of various types of data from a site. This data includes ecofacts, artifacts, features, and archaeological context. Before excavating, the presence of remains can often be suggested by remote sensings, such as ground-penetrating radar.

During excavation, stratigraphic excavation removes phases of the site one layer at a time and keeps the timeline of the material remains consistent. This is done through mechanical means and the soil is processed via methods like mechanical sieving or water flotation.

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An electron has a negative charge.

The charge of an electron is a fundamental property of the particle, and it is denoted by the symbol "e." The magnitude of the charge of an electron is approximately 1.602 × 10^-19 coulombs (C). This value is considered the elementary charge and is used as a reference for other charges. The charge of an electron plays a significant role in determining the behavior and interactions of atoms and molecules. It is opposite in sign to the charge of a proton, which is positive. The electron's charge allows it to interact with other charged particles, such as protons and ions, through electrostatic forces. Electrons are subatomic particles that orbit the nucleus of an atom in specific energy levels or orbitals. They contribute to the overall stability and chemical properties of atoms and participate in chemical bonding and reactions. The movement of electrons between atoms is what enables the formation of chemical bonds and the sharing or transfer of electrons to create ions. In summary, the charge of an electron is negative, and it plays a fundamental role in the structure and behavior of atoms and molecules.

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The new volume of the gas at 55.0ºC is 330.7 mL (rounded to three significant figures).

Assuming the gas behaves ideally, we can use the following formula to calculate the new volume of the gas:

V₂ = V₁ * (T₂/T₁)

Where:

V₁ is the initial volume of the gas at temperature T₁

T₁ is the initial temperature of the gas

V₂ is the new volume of the gas at temperature T₂

T₂ is the final temperature of the gas

We are given:

V₁ = 300.0 mL

T₁ = 25.0ºC = 298.15 K

T₂ = 55.0ºC = 328.15 K

Substituting the values into the formula, we get:

V₂ = 300.0 mL * (328.15 K / 298.15 K)

V₂ = 330.7 mL

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This technique has been used to identify the presence of gases such as oxygen, methane, and carbon dioxide in the atmospheres of exoplanets.  

i) To estimate the frequency of the violet (leftmost) emission, we can use the equation v = c/λ, where v is frequency, c is the speed of light (3.00 x 10^8 m/s), and λ is the wavelength of the emission in meters. The wavelength of the violet emission is 400 nm or 400 x 10^-9 m, so the frequency can be calculated as v = (3.00 x 10^8 m/s) / (400 x 10^-9 m) = 7.50 x 10^14 Hz.

ii) To estimate the energy of the violet emission, we can use the equation E = hv, where E is energy, h is Planck's constant (6.63 x 10^-34 Js), and v is frequency in Hz. Substituting the frequency calculated in part (i), we get E = (6.63 x 10^-34 Js) x (7.50 x 10^14 Hz) = 4.97 x 10^-19 J.

b. The spectral lines are produced by the electrons within the atoms of this element, which can absorb or emit specific amounts of energy to move between different energy levels. These energy transitions result in the emission or absorption of photons with specific wavelengths and frequencies, giving rise to the observed emission spectrum.

c. The violet emission line represents the photon with the most energy since it has the shortest wavelength (400 nm) and highest frequency (7.50 x 10^14 Hz) among the lines shown. This highest energy does not necessarily represent the energy of the valence electrons, but rather corresponds to the specific energy transitions occurring within the atoms of the element.

d. Emission spectra can be used to determine the gases present in the atmosphere of a far-away planet by analyzing the specific wavelengths of the emitted or absorbed light from the planet. Each gas has a unique emission or absorption spectrum, allowing scientists to identify the gases present in the planet's atmosphere.

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Answer:

1. The atoms in bond A are held more tightly together than the atoms in bond B.

2. The bond in nitrogen gas is the most difficult to break.

3. CH4

4. The bond energy of the reactants in reaction 1 is greater than the bond energy of the reactants in reaction 2.

5. Bromine has more electron levels than chlorine.

Explanation: I took it and I missed some BUT THESE ARE THE CORRECT ANSWERS!

It should be noted that bond A has greater energy because C. The atoms in bond A are held more tightly together than the atoms in bond B.

The relationship between the bond energies of nitrogen, iodine, and fluorine gases is that the bond in nitrogen gas is the most difficult to break.

From the information given, the molecule with the greatest bid energy is CH4. The bind energy measures the bond strength that the chemical bond has.

Also, the bond energy of the reactants in reaction 1 is greater than the bond energy of the reactants in reaction 2. Due to this, reaction 1 requires a greater input of energy than reaction 2.

Lastly, the difference in the bond energy of Chlorine and Bromine is that Bromine has more electron levels than chlorine.

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The number of squares in this figure is 5 squares.

To identify the number of squares in the figure we must take into account that a square is a geometric figure that has 4 sides of the same length.

Based on the information above, we can infer that there are 5 squares, four small squares, and 1 large square that spans the entire area of the figure. So, we can say that this figure has 5 squares.

Note: This question is incomplete because the image is missing. Here is the image:

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Oxygen sag curves occur when oxygen-demanding wastes are added to the water. These curves are a graphical representation of the amount of dissolved oxygen in a body of water over a period of time.

When oxygen-demanding wastes are added to the water, the amount of dissolved oxygen decreases, leading to an oxygen sag curve. This can occur during spring floods, upstream from a sewage treatment plant, or in fast-flowing rivers.

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Answer:

D. Argon

Explanation:

1. Which law is associated with inertia?

2. If you increase the force in an object what happens to the acceleration?

3. If you use the same force on a less massive object what happens to the acceleration?

4. Which law states force is dependent on the mass and acceleration of an object?

5. What causes an object to slowdown or speed-up?

                  HOPE IT HELPS YOU

the relationship between turtles and barnacles is an example of

co-evolution, where each species is continually adapting to changes with  the other.

Barnacles attaches to  turtle's shell due to its hardness. Barnacles needs  a hard surface to bind with so that it can thrive. A single barnacle doesn’t harm a turtle. But excessive barnacles can make a turtle inactive,also impact its vision and make it difficult to eat, and sometimes lead to infection.

.The cyprid larvae of barnacle has a special attachment devices which allow it to hold onto the substrate, e.g. cup-shaped attachment organs on the antennae. Once barnacle is settled, the barnacle develops into an adult and attaches in different  ways as gripping the skin, cementing to the shell or boring into it.

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1. The constituent gases of air are:

2. The surrounding air is not seen with the eyes because it is transparent. Air molecules are not visible to the na-ked eye, and they do not scatter or absorb visible light significantly. Therefore, air appears colorless and transparent.

3. To prove that air supports burning, you can perform an experiment with a burning candle. Place a glass jar or bell jar over a lit candle, ensuring that the jar is airtight. As the candle burns, it consumes oxygen from the air inside the jar. Eventually, the candle flame will go out due to the lack of oxygen, proving that air (specifically oxygen) is necessary for burning.

4. To show that air occupies space, you can perform a simple experiment using a plastic bottle or syringe. Fill the bottle or syringe with water, ensuring there are no air bubbles. Then, cover the opening tightly and try to compress the air inside. You will find that it is not possible to compress the air significantly, indicating that air occupies space.

5. To prove that air has weight, you can use a sensitive balance or scale. Weigh an airtight container or balloon, and then fill it with air. The weight of the container or balloon with the added air will be greater than its initial weight, demonstrating that air has weight.

6. Air is useful to us in various ways. Three points highlighting the importance of air are:

7. Three properties of air include:

Air exerts force in various ways. For example, air pressure allows objects like airplanes to fly by providing lift. Air resistance or drag opposes the motion of objects moving through the air, creating a force that can affect their speed and trajectory.

8. Four effects of air pollution include:

9. Causes of pollution:

10. Two control measures for air pollution include:

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Answer:

b.  1.9 × 10-3

Explanation:

Answer:1.9x10-3

Explanation:

average

1 mL = 0.815 g

11.2 mL = X

X = 11.2 × 0.815

= 9.128 g

mole = 9.128/58

= 0.157 mole

1 mole = 6.02 × 10^23 atoms

0.157 mol = x

X = 0.157/1 × 6.02 × 10^23

= 9.451 × 10^22 atoms of C

please to recheck answers to ensure they are correct

I really hope this helps

108.45456155999999  grams

Answer:

D

Explanation:

Photosphere is the layer where sunspots form.

Photosphere is the layer where sunspots form.

The Sun is made up of layers of material, like a baseball or rubber band ball. The photosphere is the lowest layer of the solar atmosphere. It is essentially the solar "surface" that we see when we look at the Sun in "white" (i.e. regular, or visible) light.

Like the Sun, our planet, Earth, is made up of layers, too. The thickest or most dense material on the Earth is in the very middle of our planet -- the core.

The thinnest is at the very top of our atmosphere - right next to outer space. The same is true of the Sun. But, the layers in the Sun and the Earth are much different.

Therefore, Photosphere is the layer where sunspots form.

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its false not true................

Answer:

True

Explanation:

This is true because, upon cooling the particles in a liquid loses energy, stops moving and remains constant and the forms a solid.

Therefore we can say the freezing point and melting point occurs at the same temperature

Increasing the amount of oxygen in the reaction would result in an increased yield of barium sulfate, as long as there is an adequate supply of barium sulfide.

In the given chemical equation, the reaction between barium sulfide (BaS) and oxygen gas (O2) produces barium sulfate (BaSO4).

When the amount of oxygen is increased in the reaction, it would favor the production of more barium sulfate. This is because oxygen acts as a reactant in the formation of barium sulfate. By increasing the concentration or availability of oxygen, more oxygen molecules will be available to react with the barium sulfide. The increase in oxygen will provide more oxygen atoms for the formation of sulfate ions (SO4^2-) from the sulfide ions (S^2-) in barium sulfide. Consequently, more barium sulfate will be produced in the reaction. Therefore, increasing the amount of oxygen in the reaction would result in an increased yield of barium sulfate, as long as there is an adequate supply of barium sulfide.

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It's in the last paragraph of this website.

https://community.ptc.com/t5/PTC-Mathcad/AP-Chemistry-Problem-Help/td-p/64410

The bubbling that occurs when the methanol is added to the dry sand indicate that there is no chemical reaction between  sand and methanol rather it is just methanol displacing air between sand .

Chemical reactions are defined as reactions which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.

There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.

There are three types of chemical reactions:

1) inorganic reactions

2)organic reactions

3) biochemical reactions

During chemical reactions atoms are rearranged and changes are accompanied by an energy change as new substances are formed.

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Answer:

11.3 g.

Explanation:

Hello there!

In this case, since the combustion of butane is:

\(C_4H_{10}+\frac{13}{2} O_2\rightarrow 4CO_2+5H_2O\)

Thus, since there is a 1:5 mole ratio between butane and water, we obtain the following mass of water:

\(m_{H_2O}=7.26gC_4H_{10}*\frac{1molC_4H_{10}}{58.14gC_4H_{10}}*\frac{5molH_2O}{1molC_4H_{10}} *\frac{18.02gH_2O}{1molH_2O}\)

Therefore, the resulting mass of water is:

\(m_{H_2O}=11.3gH_2O\)

Best regards!

Answer:

I had this question on a test a long time ago and i believe it is

16- or 32-

Explanation:

Answer:

hydro ponic plants

Explanation:

coz they are hydro

Petroleum is a naturally occurring liquid mixture of hydrocarbons, which is usually referred to as crude oil. It is a non-renewable resource that is extracted from the ground by drilling wells.

Petroleum is a complex mixture of various components, and it is refined into different products for use in different industries. There are various products obtained from petroleum. These products include gasoline, diesel fuel, heating oil, jet fuel, kerosene, asphalt, lubricants, and petrochemicals. Each of these products has its own unique properties and uses.

1. Gasoline: Gasoline is the most commonly used petroleum product. It is a liquid fuel that is used in internal combustion engines in cars, trucks, and other vehicles. Gasoline is a mixture of various hydrocarbons that have been refined from crude oil.

2. Diesel Fuel : Diesel fuel is another liquid fuel that is obtained from petroleum. It is used in diesel engines in trucks, buses, and other heavy-duty vehicles. Diesel fuel is made up of hydrocarbons that are heavier than those in gasoline.

3. Heating Oil :Heating oil is a liquid fuel that is used to heat homes and buildings. It is similar to diesel fuel but is refined to have a higher boiling point.

4. Jet Fuel: Jet fuel is a type of kerosene that is used to power jet engines in airplanes. It is refined to have a low freezing point and a high energy content.

5. Kerosene: Kerosene is a liquid fuel that is used for lighting, heating, and cooking. It is similar to jet fuel but is refined to have a higher boiling point.

6. Lubricants: Lubricants are oils that are used to reduce friction between moving parts in engines and machinery. They are made from refined petroleum and can be used in a variety of applications.

7. Petrochemicals: Petrochemicals are chemicals that are derived from petroleum. They are used in a wide range of products, including plastics, synthetic fibers, rubber, and detergents.

Overall, petroleum is an important resource that is used to produce a wide range of products that we use in our daily lives. The products obtained from petroleum have a significant impact on the economy, transportation, and various industries.

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The statement that is true of water's tensile strength is: it involves both cohesion and adhesion. Option A, B and C are correct.

Tensile strength refers to the ability of a liquid to resist being pulled apart. In the case of water, its tensile strength is due to both cohesion, the attraction between water molecules, and adhesion, the attraction between water and other surfaces.

Water's hydrogen bonding creates strong cohesive forces between water molecules, allowing them to stick together and resist being pulled apart. Meanwhile, water's adhesion allows it to stick to other surfaces, such as the walls of a narrow tube, which helps to pull water through plants.

Therefore, while both statements (a) and (b) are partially correct, statement (c) is the most accurate as it encompasses both cohesion and adhesion, which together contribute to water's tensile strength.

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According to the mole concept, the number of moles in 50 g of NO₂ is 1.086 as molar mass of NO₂ is 46 g and as per STP conditions volume is 24.32 L.

Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.

It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.

It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass  in grams present in one mole  of atoms is its atomic mass.

Initially the number of moles is calculated as, 50/46=1.086 moles . As 1 mole occupies 22.4 L at STP conditions,1.086 moles occupy 1.086×22.4=24.32 L.

Hence, the volume in liters of 50 g of NO₂ at STP is 24.32 L.

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Answer:

a) 1,69 M

b)11.55%

Explanation:

a) To determine the [CH3CH2OH] in the wine, we can use the stoichiometry of the balanced equation provided. Since the ratio of CrO7^2- to CH3CH2OH is 2:3, for every 2 moles of CrO7^2- that are consumed, 3 moles of CH3CH2OH are produced. Therefore, we can use the volume and molarity of the CrO7^2- solution to determine the number of moles of CH3CH2OH present in the wine sample.

The number of moles of CrO7^2- used in the titration is (26.25 mL)(0.500 M) = 13.125 moles. Therefore, the number of moles of CH3CH2OH present in the wine sample is (3/2)(13.125 moles) = 19.69 moles

Since the original volume of wine sample was 10.0 mL, the [CH3CH2OH] in the wine is (19.69 moles) / (0.01 L) = 1.969 M

b) To convert the answer in part (a) into percent by volume, we can use the density of ethanol and the conversion factor of 100mL/1L.

The density of ethanol is 0.789 g/mL, so the mass of ethanol in the sample is (19.69 moles) x (46.07 g/mol) = 910.1 g

The mass of ethanol in 100ml is (910.1g) x (100mL/1L) = 91.01 g/100mL

The volume of ethanol in the sample is (91.01 g/100mL) / (0.789 g/mL) =115.5 mL/L or 11.55% by volume.

Answer:

b.exothermic and entropy is decreasing