As a skateboarder moves down hill some of the energy is

Answer:

D

Explanation:

Edge trust me

The electron domain geometries that result in a bent molecular shape are:

A bent molecular shape occurs when there are two bonded atoms and one or more lone pairs around the central atom.

A common example of a molecule with a bent shape is water. In a water molecule, the central oxygen atom is bonded to two hydrogen atoms and has two lone pairs of electrons, resulting in a bent molecular shape with a bond angle of approximately 104.5 degrees.

Thus, the shapes are;

Trigonal Planar with two atoms and one lone pair

Tetrahedral with two atoms and two lone pairs.

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Well if the candle lost half of its mass, and they are asking where the other half went. Most likely it is still hardened wax because the it says that you're candle lost half of its mass that means half is gone and the other half is still there. The chemical change would be liquid, and the chemical property would be Wax Vapour that is what i found.

-Hope it helps, if it does not help sorry.

Hello!

To find the number of moles present in 16.2 grams of lead, we need to know how much one mole of lead weighs.

1 mole is equal to the atomic mass of an element, so, 1 mole of lead is equal to about 207.2 grams.

To find that, divide the given amount of lead by 1 mole of lead (207.2 grams).

16.2 grams / 207.2 grams ≈ 0.07818

Therefore, the amount of moles present in 16.2 grams of lead is about 0.078 moles. (round to amount of sigfigs: 0.0782 moles)

Answer:

1.   A model in the universe in which the sun, moon, stars, and planets all revolve around Earth.

2. Why did stars and planets get brighter at different times of the year if they were all moving in perfect circles around the earth? Why do some planets seem to stop and reverse direction in the sky?

3. Not all astronomical bodies revolve around Earth. Only the moon orbits earth, but that's all. In fact, Earth revolves around the sun just like all the other planets.

4. The parts about the planets revolving around something and the fact that they revolve.

5. Mass and distance.

6. The law of universal gravitation states that every mass attracts other masses with a force that is directly proportional to the product of the two masses and is inversely proportional to the square of the distance separating them.

7.

    1. All objects with mass (no matter how small) exert a gravitational attraction.

    2. The more massive an object is, the stronger its gravitational force.

    3. The greater the distance between the objects, the weaker the gravitational force.

Explanation:

Answer is: false, carbon tetrachloride contains four single bonds.

Carbon tetrachloride or tetrachloromethane (CCl₄) is an organic nonpolar compound.

Electron configuration of carbon atom: ₆C 1s² 2s² 2p².

Electron configuration of chlorine atom: ₁₇Cl 1s² 2s² 2p⁶ 3s² 3p⁵.

Chlorine atoms have one unpaired electron, carbon atom is sp3 hybridized (has four unpaired electrons).

False, The molecule CCl4 contains only four single bonds.

with his well-known gold foil experiment in which he demonstrated that the atom has a tiny and heavy nucleus.

Ernest Rutherford's most creative activity was his gold foil experiment conducted in 1909. This experiment demonstrated the structure of an atom, challenging existing models and earning Rutherford the title of 'father of nuclear physics'.

The activity that best demonstrates New Zealand physicist Ernest Rutherford's creativity is his gold foil experiment conducted in 1909. In this groundbreaking experiment, Rutherford and his colleagues bombarded a thin sheet of gold foil with a beam of high-energy alpha particles obtained from radioactive decay of radium. He then observed the subsequent velocities and trajectories of the particles, a method that led to revelations about the nuclear structure of the atom.

Rutherford's experimental design illuminated the small and dense nature of atomic nuclei. Rutherford placed a radioactive source in a lead container, producing a beam of alpha particles that struck a thin gold foil. The scattering of the alpha particles, observed by the glow they caused when they hit a phosphorescent screen, challenged existing beliefs about atomic structure. His seminal experiments with nuclear radiation and atomic structure earned him the title of "father of nuclear physics" and helped him win a Nobel Prize in Chemistry in 1908.

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A 1 mol dm-3 hydrochloric acid will likely not have a notable effect on a bulb unless the bulb is in direct contact. Hydrochloric acid is generally used for reactions with metals, but if the bulb contains metals then this can cause corrosion.

The effect of 1 mol dm-3 hydrochloric acid on a bulb would most likely not be substantial unless the bulb was physically placed in the acid. The point of your question appears to be concerning a reaction between hydrochloric acid and some form of material. Hydrochloric acid is a strong acid that is widely utilized in industries for the production of metal chlorides, dyes, glue, and glucose, among other substances. When it reacts with metals, a reaction occurs to form a salt and hydrogen gas. However, in the context of an electric bulb, unless the bulb is made of a specific material that reacts with HCl, there may not be a significant change. It's important to keep in mind that hydrochloric acid is corrosive and can cause damage to the surface of the bulb, particularly if it's made of metal or contains metal elements.

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Answer:- 21.4 grams of [tex]Li_3N[/tex] are formed.

Solution:- The balanced equation is:

[tex]6Li+N_2\rightarrow 2Li_3N[/tex]

From this equation, lithium and nitrogen reacts in 6:1 mol ratio. Limiting reactant gives the theoretical yield of the product. We will calculate the grams of the product for the given grams of both the reactants and see which one of them gives the limited amount of the product. This limited amount of the product will be the theoretical yield.

The molar mass of Li is 6.94 gram per mol and for [tex]N_2[/tex] It is 28.02 gram per mol. The molar mass of [tex]Li_3N[/tex] is 34.83 gram per mol. The calculations for the grams of the product for given grams of both the reactants are shown below:

[tex]12.8gLi(\frac{1molLi}{6.94gLi})(\frac{2molLi_3N}{6molLi})(\frac{34.83gLi_3N}{1molLi_3N})[/tex]

= [tex]21.4gLi_3N[/tex]

[tex]34.9gN_2(\frac{1molN_2}{28.02gN_2})(\frac{2molLi_3N}{1molN_2})(\frac{34.83gLi_3N}{1molLi_3N})[/tex]

= [tex]86.8gLi_3N[/tex]

From above calculations, Li gives least amount of the product. So, 21.4 g of [tex]Li_3N[/tex] are formed.

The theoretical yield of Li3N is 21.58 grams when 12.8 grams of Li is heated with 34.9 grams of N2. This is determined by first identifying the limiting reactant through mol calculations and then using the balanced chemical equation to calculate the theoretical yield.

To find the theoretical yield of Li3N, we first need to determine which is the limiting reactant. The balanced chemical equation is: 6Li + N2 -> 2Li3N.

From the periodic table, we find that the molar mass of Li is about 6.94 g/mol, and that of N2 is about 28.01 g/mol. Therefore, we have:

According to the balanced chemical equation, 6 moles of Li react with 1 mole of N2 to produce 2 moles of Li3N. Thus, the actual amount of Li can react with 1.85 / 6 = 0.3 mol N2, which is less than the existing amount of N2. Therefore, Li is the limiting reactant.

According to the reaction equation, 6 mol Li reacts to generate 2 mol Li3N, then 1.85 mol Li will generate 1.85 *(2 / 6) = 0.62 mol Li3N. Given that the molar mass of Li3N is about 34.83 g/mol, the theoretical yield is 0.62 * 34.83 = 21.58 g Li3N. Therefore, the theoretical yield of Li3N is 21.58 grams when 12.8 grams of Li is heated with 34.9 grams of N2.

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Hello,

Question - Which of the following is plotted on the y-axis of a distance versus time graph?

Answer - A. Distance

Why - The reason its distance is because the fact that distance is a dependant variable and always will remian on the y axis.

Answer:- [tex]C_4H_1_0>C_3H_8>C_2H_6>CH_4[/tex]

Explanations:- Alkanes are non polar molecules as these only have carbons and hydrogens. Electron negativity difference of C and H is very low and it makes them non polar. These have weaker London dispersion forces.

The forces of attraction becomes stronger in alkanes as the number of carbon increases because the surface area as well as molecular weight of the alkanes increases with an increase in number of carbons.

Butane has four carbons, propane has three carbons, ethane has two and methane has only one carbon, So, the strongest to weakest order of inter molecular forces is butane > propane > ethane > methane .

Answer:

The answer is C4H10-C3H8-C2H6-CH4

Explanation:

100% CORRECT

B. Electrons move from metals from nonmetals creating ionic compounds.

When this happens, you are seeing c) a new moon. You won't be able to see the moon.

Anything in orbit around the Sun is basically moving fast enough to be in a constant state of freefall towards it. If the planets, for example, suddenly stopped moving they would immediately be pulled towards the Sun and fall into it.

A. Gases

The state of matter that can be compressed is gas.

Answer:

Gases (C)

Explanation:

I took the test

Answer:

The air pressure will increase

Explanation:

The bottle is sealed, therefor the number of molecules can't change. The air inside the bottle may be considered as an ideal gas, and these have a particular set of laws they must obey.

In this case the law that apllies is Boyle's Law, which states that at a constant temperature, the pressure P of a gas varies inversely with its volume V, or P.V = k, where k is a constant.

If the volume is decreasing, the pressure must increase.

conduction - the transfer of heat to an object through contact

Answer: Conduction

Explanation:

Answer:

mass: 96.5 g

volume: 5 cm^3

density: 19.3 g/cm^3

The object you found in the creek is a gold nugget

Explanation:

If a mass of 96.5g will balance the object in a pair of scales, then its mass is 96.5 g.

If the object displaces 5 mL of water when you introduce it in some vessel, then its volume is 5 cm^3 (notice that mL and cm^3 are numerically equal).

The density of an object is the quotient between mass and volume, then the density of the object is: 96.5 g/5 cm^3 = 19.3 g/cm^3

From its density it can be deduced that the object is a gold nugget.

The density value can provide clues about the material composing the object, as different substances have different densities.

Mass: Mass refers to the amount of matter an object contains.

Volume: Volume is the amount of space occupied by an object. It is usually measured in cubic centimeters (cm³) or milliliters (mL). In the given scenario, the object displaces 5 mL of water, indicating that its volume is 5 cm³.

The equation for density is:

Density = Mass / Volume

In the given scenario, the density of the object can be calculated once its mass is determined.

Divide the mass (in grams) of the object by its volume (in cubic centimeters) will give the density (in grams per cubic centimeter, g/cm³).

To identify the object, it would be necessary to compare its density with known densities of various substances. The density value can provide clues about the material composing the object, as different substances have different densities.

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Hey there!:

Number of moles =   ( number of atoms / 6.023*10²³ atoms )

given number of atoms = 5.03*10²⁴

Therefore:

Number of moles B = 5.03*10²⁴ / 6.023*10²³

Number of moles B = 8.35 moles

Hope that helps!

As from the given information Nancy's aim is to find the steepness of a hill's slope which will affect the amount of soil that erode from the surface so, the variable that should not be changed in this experiment should be the height of the long pan. The height of the long pan is made using the blocks of books on which the end of the pan is balanced. This should remain uniform and constant throughout the experiment so that other variables of the experiment can be altered and the results can be verified accordingly.

Answer:the amount of water she pours on the model

Explanation:

Hey there!:

Molar mass FeF3 = 112.84 g/mol

Number of moles  = mass of solute / molar mass

Number of moles = 24.0 / 112.84

Number of moles = 0.212 moles of FeF3

Hope that helps!

Hello!

Each element on the periodic table ALWAYS begins with an UPPERCASE letter, for example, hydrogen is written as H.

If the element has two letters, for example lithium, then the first letter is UPPERCASE, and the next letter is LOWERCASE. This is shown as Li.

If there's two or more elements (also known as a compound), (ex. sodium chloride), then it follows the same rules, the first letter is in UPPERCASE and next letter is LOWERCASE, but when a new element is introduced (in this case chlorine), the first letter is UPPERCASE and the next letter in LOWERCASE. Sodium is Na and Chlorine is Cl. As a compound it is NaCl, and it's name is sodium chloride.  

Basic rules:

The rules for writing the symbols of elements in chemistry are based on abbreviations derived from common names or other languages, with most symbols having one or two letters. The first letter of the symbol is capitalized to avoid confusion with other notations.

The rules for writing the symbols of elements in chemistry are as follows:

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color

density

volume

mass

boiling point

melting point

Metals have delocalized electrons due to the nature of their atomic structure and bonding. In metallic bonding, the valence electrons are not bound to a single atom but are shared among all the atoms in the metal. This sharing creates a sea of electrons that is free to move throughout the metal.

Here's the explanation and logic behind this phenomenon:

1. Atomic Structure of Metals: Metals are characterized by having one, two, or three valence electrons in their outermost shell. These electrons are loosely held and can be easily removed or shared.

2. Metallic Bonding: In a metal, the positively charged metal ions are held together by the negatively charged electrons. Unlike ionic or covalent bonds, which involve the transfer or sharing of electrons between specific atoms, metallic bonds are formed by the attraction between the metal cations and the delocalized electrons that surround them.

3. Delocalization: The valence electrons in a metal are not localized between specific atoms but are instead spread out over the entire metal lattice. This delocalization is energetically favorable because it allows the electrons to move freely and occupy a range of energy levels.

4. Energy Bands: In metals, the atomic orbitals overlap to form energy bands. The valence electrons occupy the highest energy band, which is only partially filled. Because of this, electrons can easily gain energy and move within this band, leading to high electrical and thermal conductivity.

5. Mobility of Electrons: The delocalized electrons can move freely throughout the metal. When an electric field is applied, these electrons can drift in a particular direction, resulting in an electric current. Similarly, when heat is applied, the electrons can carry the thermal energy throughout the metal.

6. Strength and Malleability: The delocalized electrons also contribute to the strength and malleability of metals. The sea of electrons holds the metal ions together, allowing the ions to slide past each other without breaking the metallic bond, which is why metals can be hammered into different shapes without shattering.

In summary, metals have delocalized electrons because the atomic structure and the type of bonding in metals favor the sharing of valence electrons across the entire lattice, creating a mobile sea of electrons that is responsible for the characteristic properties of metals, such as conductivity, luster, and malleability.

For example, certain medications may influence the results of the test.

Drug test can show the presence of illicit or prescription drugs on hair samples, although the person has not used these drugs.

Some of false positive drug use is because of this medications: antihistamines, decongestants, antibiotics, antidepressants, analgesics and antipsychotics.

False positives in hair drug tests can occur due to cross-reactivity with medications, passive exposure, external contamination, and handling errors. Confirmatory testing with GC-MS is suggested after a positive result. The reliability of a test also depends on laboratory standards and procedures.

False positives in hair drug tests can occur for a variety of reasons. These tests are designed to detect the presence of drugs and their metabolites in the hair. However, sometimes substances that have a similar chemical structure to those being tested for can interfere with the results, leading to a false positive.

Cross-reactivity with other medications, passive exposure to drugs, external contamination, and even errors in the handling or processing of the hair sample can result in an inaccurate test outcome. It's also possible for hair products or treatments to affect the test. If someone receives a positive result but has not used drugs, they should request a confirmatory test, like gas chromatography-mass spectrometry (GC-MS), which can provide a more accurate result.

Furthermore, drug test accuracy can depend on the standards and procedures of the testing lab. Factors such as how the hair is washed and the cutoff levels for a positive result can vary between labs, affecting the test's reliability. It's important to ensure that drug testing is conducted by a reputable and certified laboratory to minimize the likelihood of a false positive.

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1) The type of bond in metalloids to metal is metallic bond.

Metallic bond is a type of chemical bond.  

Metallic bond is formed between electrons and positively charged metal ions.

Metallic radius is defined as one-half of the distance between the two adjacent metal ions.  

Metallic bond increace electrical and thermal conductivity.  

Metals conduct heat, because when free moving electrons gain energy (heat) they vibrate more quickly and can move around.  

2) The type of bond in nonmetal is covalent bond.

Nonmetals have low electrical and thermal conductivity.