5 different observations of moving vehicles? please help!!!! ​

Answer:

n = 0.0088

Explanation:

Molar mass of N2 = 2 x 14 = 28

Moles = mass/molar mass

n = 0.247/28

n = 0.0088...

The number of moles of Nitrogen in 0.247g of Nitrous Oxide is 0.01122 moles.

The question is asking about the quantification of moles of 'N' in a given amount of Nitrous oxide (N2O). The Molar mass of Nitrous oxide (N2O) is approx 44.01 g/mole, and the molar mass of Nitrogen (N) is approx. 14.01 g/mole. Hence, there are 2 moles of N in a single mole of N2O as depicted by the molecular formula. Therefore, first we calculate the number of moles of N2O by the formula: moles = mass/molar mass. Using the given mass (0.247g), moles of N2O = 0.247/44.01 = 0.00561 moles. As there are 2 moles of N in every mole of N2O, the moles of N in 0.247g N2O = 2 * 0.00561 = 0.01122 moles.

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Answer:

Helium-4 atom

Alpha particle, positively charged particle, identical to the nucleus of the helium-4 atom, spontaneously emitted by some radioactive substances, consisting of two protons and two neutrons bound together, thus having a mass of four units and a positive charge of two.

Explanation:

hope this helps

Helium (⁴₂He) atoms are chemical species called alpha particles.

Alpha particles or Alpha rays are positively charged particles emitted from the decay of several radioactive materials. The mass of the Alpha particle is due to the two protons and two neutrons. Therefore, the Alpha ray nucleus is very identical to the nucleus of the Helium atom. They are denoted by the Greek alphabet α.

An alpha particle is also known by the interchangeable term doubly ionized helium nuclei (He²⁺). The mass of an alpha particle is equal to 6.64 × 10⁻²⁷ Kg. Alpha particles are usually formed during the standard radioactive decay of atomic nuclei.

Alpha particles have an average kinetic energy of 5MeV and a velocity of 5% of that of the velocity of light. They are also generated in high-energy particle accelerators. They are highly ionized particles and have low penetration depth compared to other subatomic particles.

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Answer:

Denaturation is a process in which proteins or nucleic acids lose the quaternary structure, tertiary structure, and secondary structure which is present in their native state, by application of some

Explanation:

Answer:

Amphetamine | C9H13N | CID 3007 - structure, chemical names, physical and chemical properties , ... Defined Bond Stereocenter Count, 0, Computed by PubChem ... Collision Energy, 10 eV .

The question is incomplete. Here is the complete question.

Consider the selenium atom, Se, and the bromine atom, Br.

Write out the full electron configuration fro each atom.

Se:

Br:

Calculate the Effective Nuclear Charge for each atom. Show all of your work for full credit.

Se:

Br:

Which atom is larger?

Answer and Explanation: Electron Configuration of an atom demonstrates the shape and energy of its electrons. One of the rules used for it is given by using Madelung's Rule, in which the order of increased energy of the electrons is:

1s < 2s < 2p < 3s < 3p < 4s < 4p < 5s < 6s < 4f < 5d < 6p < 7s < 5f < 6d < 7p

Atom of Selenium (Se) has 34 electrons. Its electron configuration is

Se: \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{4}\)

Atom of Bromine has 35 electrons. Its electron configuration is

Br: \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{5}\)

Effective Nuclear Charge (\(Z_{eff}\))is the net positive charge experienced by an electron in a multi-electron atom. In other words, it is the net force that helds nucleus and electrons together.

It is calculated by: \(Z_{eff}=Z-S\)

where

Z is the atomic number, i.e., number of protons of the atom

S is the nonvalence electrons, i.e., the number of electrons between the nucleus and the electron in question.

For Selenium (Se):

From the electron configuration, the valence shell is 4 with 6 valence electrons. Nonvalence electrons is the difference between valence and total electrons:

S = 34 - 6 = 28

\(Z_{eff}=34-28\) = 6

The Effective Nuclear Charge of Se is 6

For Bromine (Br):

The valence shell, according to the configuration, is 4 and valence electrons are 7.

S = 35 - 7 = 28

\(Z_{eff}=35-28\) = 7

The Effective Nuclear Charge fo Br is 7.

Bromine is larger than Selenium because it has bigger Effective Nuclear Charge, which means it held its electrons more loosely and, consequently, has a larger atomic radius.

Answer:

273.2

Explanation:

Answer:

the answer is 74.1 g/mol

Explanation:

Answer:

The molar mass of dimethylnitrosamine is 74.1 g/mol b

0.1875grams/cm3 is the density of the cube below if

the mass is 45g7.

A material substance's density is its mass per unit volume. D is density, M is mass, and V is volume, therefore the formula for density is d = M/V. In terms of grammes per cubic centimeter, density is frequently expressed. As an illustration, the density of water is 1 g/cc, whereas the density of the Earth is 5.51 g/cc.

As kilos per cubic metre, density can also be calculated (in metre-kilogram-second or SI units). As an illustration, air has a density of 1.2 kilograms per cubic metre. Textbooks and manuals contain lists of the densities of common solids, liquids, and gases. The mass of a body can be calculated from its volume using density, and vice versa. The mass is equal to the volume multiplied by the density (M = Vd), whereas the volume is equal to the mass divided by the density (V = M/d). You may calculate a body's weight by multiplying its mass by the acceleration of gravity, which is typically of more practical significance than its mass.

Derive the mass and volume of this sugar cube

Mass = 45 grams

sides are h=16m

                L=5cm

               W=3cm

ρ = m/V

ρ = density, kg/m3, or g/(cm)3

m = mass, in kg or g

V = volume, in m3 or (cm)3

Here, ρ = density, m = mass, and v = volume.

ρ = 45/16×5×3

Density of the cube is 0.1875grams/cm3

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Answer:

A

Explanation:

has properties that are different from the original substances.

Answer:

Covalent bond

Explanation:

A covalent bond is defined as the sharing of election pairs between atoms

Answer:

1. a. The reactants are H₂ and O₂; The product is H₂O

b. The equation is not balanced because the number of atoms of the elements reacting is not equal to the number of atoms produced. 2 atoms of oxygen reacted but only one atom of oxygen is produced.

c. 2 H₂ + O₂ ---> 2 H₂O

2. a. The monotonic molecule is the sodium molecule, Na, since itnis made up of only one atom in its molecule.

The diatomic molecule is oxygen molecule, O₂, since it is made up of two atoms in its molecule.

b. The chemical compound present is sodium oxide, Na₂O

c. 4 Na + O₂ ---> 2 Na₂O

Explanation:

In a chemical reaction, the reactants are the elements or compounds which are converted to a new substance whichnis known as the product. The products are the new substances formed from the reactants.

In the given equation of reaction below;

H₂ + O₂ ---> H₂O

a. The reactants are H₂ and O₂; The product is H₂O

b. The equation is not balanced because the number of atoms of the elements reacting is not equal to the number of atoms produced. 2 atoms of oxygen reacted but only one atom of oxygen is produced.

c. 2 H₂ + O₂ ---> 2 H₂O

2. Given the reaction equation below:

Na + O₂ ---> Na₂O

a. The monotonic molecule is the sodium molecule, Na, since it is made up of only one atom in its molecule.

The diatomic molecule is oxygen molecule, O₂, since it is made up of two atoms in its molecule.

b. The chemical compound present is sodium oxide, Na₂O since itconsists of two chemically combined elements, sodium and oxygen.

c. 4 Na + O₂ ---> 2 Na₂O

Answer:

independent: type of liquid

dependent: growth of plant

control: time

constant: time

constant: time

hypothesis: If I water the plant with water, it will grow the most because water is the liquid that sustains life on earth.

Explanation:

We have 3 subatomic particles that are represented in the image, they are:

Neutrons: their charge is 0 (they have no charge) and they are located in the nucleus.

Protons: their charge is +1 and they are located in the nucleus.

Electrons: their charge is -1 and they are located in the shells outside the nucleus.

Electrolysis, process by which electric current is passed through a substance to effect a chemical change.

Emission spectrum results from the movement of an electron from a higher to a lower energy level. The frequency of the photon is 5.5 * 10^14 Hz.

From the formula;

E = hc/λ

h = Plank's constant =\(6.6 * 10^-34\) Js

c = speed of light=  \(3 * 10^8\)

λ = wavelength = \(546.1 * 10^-9\) m

E =  \(6.6 * 10^-34 * 3 * 10^8/546.1 * 10^-9\)

E =\(3.63 * 10^-19\) J

Also;

E =hf

Where;

h = Planks's constant

f = frequency of photon

f = E/h

f = \(3.63 * 10^-19 J/6.6 * 10^-34\)

f = \(5.5 * 10^14\) Hz

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Taking into account the reaction stoichiometry, 0.838422 grams of AgCl is formed from the reaction of 75.0 mL of a 0.078 M AgC₂H₃O₂ solution with 55.0 mL of a 0.109 M MgCl₂ solution.

In first place, the balanced reaction is:

2 AgC₂H₃O₂ + MgCl₂ → 2 AgCl + Mg(C₂H₃O₂)₂

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

Molarity indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:

molarity= number of moles of solute÷ volume

Molarity is expressed in units moles/L.

In this case, you know:

Taking into account the definition of molarity, the number of moles of each reactant can be calculated as follows:

The limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction.

To determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 1 mole of MgCl₂ reacts with 2 moles of AgC₂H₃O₂, 0.005995 moles of MgCl₂ reacts with how many moles of of AgC₂H₃O₂?

moles of AgC₂H₃O₂= (0.005995 moles of MgCl₂× 2 moles of AgC₂H₃O₂)÷ 1 mole of MgCl₂

moles of AgC₂H₃O₂= 0.01199 moles

But 0.01199 moles of AgC₂H₃O₂ are not available, 0.00585 moles are available. Since you have less mass than you need to react with 0.005995 moles of MgCl₂, AgC₂H₃O₂ will be the limiting reagent.

Considering the limiting reagent, the following rule of three can be applied: if by reaction stoichiometry 2 moles of AgC₂H₃O₂ form 286.64 grams of AgCl, 0.00585 moles of AgC₂H₃O₂ form how much mass of AgCl?

mass of AgCl= (0.00585 moles of AgC₂H₃O₂× 286.64 grams of AgCl)÷ 2 moles of AgC₂H₃O₂

mass of AgCl= 0.838422 grams

Finally, 0.838422 grams of AgCl is formed.

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(a) Because acid is caustic, dolphins can perish from exposure to it. Acids are compounds that give other things protons (H+). Acid can react with the proteins and lipids in dolphins' skin when they come into touch with it, leading to chemical burns and damage to the underlying tissue. Systemic consequences from this include death.

(b) Because chlorine is a potent oxidizer, it interacts with red-hot iron powder to produce Iron(III) chloride (FeCl3) rather than Iron(II) chloride (FeCl2). FeCl3 is created when chlorine at high temperatures rapidly accepts electrons from iron atoms. Contrarily, iron interacts with HCl, a less potent oxidizer than chlorine, to produce FeCl2.

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Answer: conduction

Explanation:

the heat passes out of the stove and into your hand. So is holding an ice cube – the heat is conducted out of your hand, and into the ice cube (that’s why your hand feels cold).

Answer:

Conduction

Explanation:

Conduction occurs when objects touch. The heat from the warmer object is transferred to the cooler object, eventually evening out the temperatures.

Answer:

neon sulfur iodine xenon

Answer:

The Glossopteris fossil, Fern, is found in Australia, Antarctica, India, South Africa, and South America—all the southern continents.

Answer:

Option 4, \(O^{2-}\)

Explanation:

Step 1:  Determine which option is correct

We know that Ne has 10 electrons therefore we need to find a different ion that has the same amount.  

Option 1 → Ca has 20 electrons and with 2+ we would remove 2 of those which would leave us with 18.

Option 2 → Cl has 17 electrons and with a - we would add 1 of those which would leave us with 18.

Option 3 → Li has 3 electrons and with a + we would remove 1 of those which would leave us with 2.

Option 4 → O has 8 electrons and with a 2- we would add 2 of those which would leave us with 10.  

Since the only one that matches up in the number of electrons is \(O^{2-}\) we can conclude that option 4 is correct.

Answer:  Option 4, \(O^{2-}\)

Answer:

The basic unit of the nervous system is a nerve cell or neuron. The nervous system transmits signals between the brain and the rest of the body, this way, the nervous system's activity controls the ability to move, breathe, see, and think.

Explanation:

Have a great rest of your day
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Answer:

A covalent bond, also called a molecular bond, is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding.Explanation:have a good day :P

Answer:

12

Explanation:

12

It is likely that the temperature of the steam is higher than the temperature of the water boiling in the kettle. The intense heat felt by Alka from the puff of steam supports this observation.

In general, the temperature of steam produced from boiling water is higher than the temperature of the water itself. When water boils, it undergoes a phase change from a liquid to a gas, forming steam.

During this phase change, the water absorbs heat energy from the heat source, such as a stove or electric kettle, and converts it into the latent heat of vaporization.

The boiling point of water is 100 degrees Celsius (212 degrees Fahrenheit) at standard atmospheric pressure. At this temperature, the water molecules have enough energy to overcome the intermolecular forces and transition into the gaseous state.

However, steam is hotter than the boiling point of water because it contains additional heat energy in the form of latent heat. The heat energy absorbed during vaporization is stored as latent heat within the steam. As the steam gushes out of the spout of the kettle, it releases this latent heat energy, which can be felt as intense heat.

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The initial pressure exerted on the balloon was 8 atmospheres.

To find the initial pressure exerted on the balloon, we can use Boyle's Law, which states that the pressure of a gas is inversely proportional to its volume when temperature is constant. The formula for Boyle's Law is P1V1 = P2V2, where P1 and V1 represent the initial pressure and volume, and P2 and V2 represent the final pressure and volume.

In this case, we are given that the initial volume (V1) is 14 L and the final volume (V2) is double the initial volume (2 x V1). We are also given that the final pressure (P2) is 4 atmospheres. We need to find the initial pressure (P1).

Using the formula P1V1 = P2V2 and plugging in the given values, we have:

P1 * 14 = 4 * (2 * 14)

P1 * 14 = 4 * 28

P1 * 14 = 112

To isolate P1, we divide both sides of the equation by 14:

P1 = 112 / 14

P1 = 8

It's important to note that the unit of pressure in this case is atmospheres, as stated in the question. If the pressure unit had been different, appropriate unit conversions would have been necessary.

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Answer:

The definition of conceptual is something having to do with the mind, or with mental concepts or philosophical or imaginary ideas. An example of conceptual is when you formulate an abstract philosophy to explain the world which cannot be proven or seen. "Conceptual."

Explanation:

The density of ammonia is 00117 gm|M|.

We know D = MP/RT

Now, P = 1600 mm = 1600/760=2.10atm

∴D=\(\frac{17\times2.10}{821\times 373}\)

D= 0.00117 gm|M|

Density of a material shows the density of that material in a  given area. The density of a material is defined as its mass per unit volume. Density is basically a measure of how tightly  packed a substance is. It is a unique physical property of a particular object. The principle of density was discovered by the Greek scientist Archimedes. Calculating density is easy  if you know the formula and understand the  units involved. The symbol ρ means density, or it can also be indicated by the letter D.

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d = 0.00117gm|M|

The density of ammonia gas is 0.00117gm|M|

Here we want to find density of ammonia gas,

The equation is,

                       d = MP/RT,

where d is the gas's density in g/L,

M is the gas's molar mass in g/mol,

P is the gas's pressure in ATM, and R is the gas law constant.

The equation shows that as the density of a gas increases, so does its molar mass.

given ,

M = 17.1 g/mol

P = 1600mmHg => (to convert to ATM) = 1600/760  = 2.10 atm

R= 8.31J/K⋅mol

T= 373°c

substituting values,

        d = (17.1 x 2.10) / 8.31 x 373

         d  = 0.00117gm|M|

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Answer:

Choice B, C, and D.

Explanation:

Choice A is not true in general. Here's a way to think about that. Consider a very special equilibrium where the concentration of reactants and products are indeed equal. When one of the external factors (such as temperature) changes, the equilibrium will shift towards either side of the reaction. More products will be converted to reactants, or vice versa. Either way, in the new equilibrium, the concentration of the reactants and products will not be equal any more.

Choice B should be considered with choice C and D in mind.

Choice C is indeed correct. The reaction rate would not be zero unless all the reactants were used up or taken out of the system. That's not what happens in an equilibrium. Instead, when reaction rate is plotted against time, the graph for reactions in both directions will eventually flat out at a non-zero value.

Choice D explains why even though choice C is correct, the concentration of a system at equilibrium stays the same. At the equilibrium, reactions in both directions are still happening. However, during the time it takes for the forward reaction use up some reactant particles, the reverse reaction would have produced these particles again. On a large scale, there would be no observable change to the concentration of each species in the equilibrium. Therefore, choice B is also correct.

Answer:

66 grams of ice would have to melt to lower the temperature of 352 mL of water from 15 °C to 0 °C.

Explanation:

To calculate the amount of ice that would have to melt to lower the temperature of 352 mL of water from 15 °C to 0 °C, we need to use the formula:

Q = m_water * c_water * ΔT_water + m_ice * Lf

where,
Q = the amount of heat transferred,
m_water = the mass of water, c_water is the specific heat capacity of water,
ΔT_water = the change in temperature of water, m_ice = the mass of ice,
Lf = the specific latent heat of fusion of ice.

First, let's calculate the amount of heat transferred to the water:

Q = m_water * c_water * ΔT_water
Q = 352 g * 1.0 cal/(g*°C) * (15-0) °C
Q = 5,280 cal

Next, we can use the specific latent heat of fusion of ice, which is 80 cal/g, to calculate the amount of heat required to melt the ice:

Q = m_ice * Lf
Q = m_ice * 80 cal/g
m_ice = Q / Lf
m_ice = 5,280 cal / 80 cal/g
m_ice = 66 g