Neils Bohr believed that electrons orbited the nucleus in different energy levels, based on strong support from

Number of moles= mass/ molar mass

Or n=m/MM

n = number of moles

m = mass

MM = molar mass

1) n CuO = 2.4g / 79.54g/mol = 0.03 mol CuO

2) n Cu(NO3)2.xH2O = 7.26 g / 205.6 = 0.035 moles of Cu(NO3)2.xH2O

3) 205.6 g

Cu = 63.5 g

N = 14g

O =16g

H= 1 g

63.5+ (14+(16*3))*2+1*2+16 =205.6 g

4) yes is 188g

5) I don’t know, I assume was 1

1) The number of moles of CuO formed is 0.117 moles. 2) The number of moles of Cu(NO3)2.xH2O in the hydrate is 0.117 moles. 3) The mass of 1 mole of Cu(NO3)2.xH2O is 62 g. 4) The mass of 1 mole of Cu(NO3)2 is 188 g. 5) The value of x in the hydrate is -126 g/mol.

In order to answer the given questions, we need to first find the molar mass of Cu(NO3)2.xH2O. The molar mass of Cu(NO3)2 is 187.55 g/mol. To find x, we can subtract the molar mass of Cu(NO3)2 from the molar mass of Cu(NO3)2.xH2O. The molar mass of Cu(NO3)2.xH2O is 249.55 - 187.55 = 62 g/mol. Now we can answer the questions:

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the plant cells are placed in the salt solution, there is a higher concentration of water molecules in the cell and a lower concentration of water in the salt solution and thus a concentration gradient has been set up. the cell membrane is now pressed up against the cell wall and the cell is said to be turgid.

Answer:

i don't know

Explanation:

Answer: H2SO4(aq) + 2NaOH(aq) → Na2SO4(aq) + 2H2O(1)

Explanation:

[tex]H_2SO_4(aq) + 2NaOH(aq)[/tex] → [tex]Na_2SO_4(aq) + 2H_2O(l)[/tex] is the formula equation for the reaction between sulfuric acid and dissolved sodium hydroxide if all products and reactants are in the aqueous or liquid phase.

Formula Equation: represents the reactants and products of a chemical reaction by their symbols or formulas.

Example, [tex]CH_4(g) + O_2(g)[/tex] → [tex]CO_2(g) + H_2O(g)[/tex]

[tex]H_2SO_4(aq) + 2NaOH(aq)[/tex] → [tex]Na_2SO_4(aq) + 2H_2O(l)[/tex] is the formula equation for the reaction between sulfuric acid and dissolved sodium hydroxide if all products and reactants are in the aqueous or liquid phase.

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Answer:

1.67 atm.

Explanation:

where, P is the pressure of the gas in atm (P = ??? atm).

V is the volume of the gas in L (V = 5.0 L).

n is the no. of moles of the gas in mol (n = 0.5 mol).

R is the general gas constant (R = 0.0821 L.atm/mol.K),

T is the temperature of the gas in K (T = 203 K).

∴ P = nRT/V = (0.5 mol)(0.0821 L.atm/mol.K)(203 K)/(5.0 L) = 1.67 atm.

Answer:

36000 centimeters

Explanation:

If the average speed of a species of tortoise is 0.36 km/h, then it would be 36000 centimeters.

The particles in a solid are tightly packed and locked in place. Although we cannot see it or feel it, the particles are vibrating in place.

As these molecules heat up, they will vibrate more vigorously, and will eventually turn to water, then gas.

Answer:

Hardly move and vibrate

Explanation:

in solids particles are packed thight together

Answer:

[tex]\boxed{\text{Roughly a million times greater}}.[/tex]

Explanation:

For example, the energy released in burning 1 mol of octane, a component of gasoline, is about 5000 kJ.

The energy released in the fission of 1 mol of uranium-235 is

about 1.5 × 10¹⁰ kJ .

The ratio is  

[tex]\dfrac{1.5 \times 10^{10} }{5000} \approx 3 \times 10^{6}\\\\\text{The energy released by nuclear reactions is } \boxed{\textbf{roughly a million times greater}}\\\text{ than that released during chemical reactions.}[/tex]

The energy released during chemical reactions is much greater than the energy released per mole of reactant during nuclear reactions.

A nuclear reaction can be defined as a type of reaction in which the nucleus of an atom of a radioactive element is transformed by being joined (fusion) or split (fission) with the nucleus of another atom and it is accompanied by the release of great amount if energy.

A chemical reaction refers to a chemical process that involves the continuous transformation (rearrangement) of the ionic, atomic or molecular structure of a chemical element by breaking down and forming chemical bonds, in order to produce a new chemical compound.

In conclusion, the energy released per mole of reactant during chemical reactions is much greater than the energy released per mole of reactant during nuclear reactions.

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Answer:

Six electrons.

Explanation:

A carbon atom has six protons, so it must have six electrons.

The carbon atom has a total of six (6) electrons.

Hence, the carbon atom has a total of six (6) electrons.

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Answer:

D

Explanation:

There are only 2 ways to explain this.

distance

and brightness caused by what it is burning.

A is true but it is not the explanation of why it is true.

B this is actually not true. Other stars would burn much more.

C It is not the largest star. In fact it is in the lower middle.

D is the answer. 93 million miles as these things go, is not every much.

Answer:

I did this and the right answer was D

Explanation:

Answer:

See below.

Explanation:

That is because  of the .48.

85.48 is closer to 85 than 86.

Answer:

High temperature

Explanation:

Drastic increase in temperature can cause bonds between atoms to change and reorganise. Temperature furnishes atoms the necessary energy to change position and form new bonds.

Increase in temperature coupled with increasing pressure drives metamorphic mineral changes in rocks. During metamorphic changes, new minerals froms as a result of atoms being reorganized.

Temperature simply provides kinetic energy for atoms to move and reorganize themselves.

Answer:

As the climate warms, it changes the nature of global rainfall, evaporation, snow, stream flow and other factors that affect water supply and quality. Specific impacts include: Warmer water temperatures affect water quality and accelerate water pollution.

Explanation:

Answer:

if there water pollution the climate will not hange as good it will chang as bad and the animals will be affected as well.sorry if im wrong.

Answer:

c. Radiation

Explanation:

a and b are wrong. You can't have convection or convection currents without air, and all the air has been removed from the box.

d is wrong. There is no liquid in the box.

c is correct. Heat can be transmitted even through a vacuum by radiation (e.g., the Sun). You can quickly feel the heat radiated by a piece of white-hot iron.

A scientist heats a piece of iron until it is glowing white-hot. He places the metal inside a metal box. He removes all of the air from the inside of the box. After a few seconds, the sides of the box that are not touching the metal begin to feel warm. Radiation process is most likely responsible for the warming.

Hence, Option (C) is correct answer.

The transfer of  heat energy by direct contact is called Conduction.

The transfer of thermal energy through the movement of matter is called as Convection current.

The transfer of thermal energy through the thermal emission is called as Radiation.

It is the process in which heat requires to occur is called Evaporation.

Thus from the above conclusion we can say that A scientist heats a piece of iron until it is glowing white-hot. He places the metal inside a metal box. He removes all of the air from the inside of the box. After a few seconds, the sides of the box that are not touching the metal begin to feel warm. Radiation process is most likely responsible for the warming.

Hence, Option (C) is correct answer.

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To test the hypothesis that increasing temperature allows more sugar to dissolve, temperature is varied and the solubility of sugar is measured. The solubility usually increases with temperature due to more energetic collisions between solvent and solute molecules. Solubility curves illustrate this relationship and show variability across different solutes.

The hypothesis to be tested is that increasing the temperature of a liquid increases the amount of sugar that can be dissolved. To do so, you would change the Temperature (D) of the solvent and measure the Solubility (C) of a solid. The solubility of most substances, including sugar, depends strongly on temperature. As you increase the temperature, you are giving the solvent molecules more kinetic energy, which results in more collisions with the solute with greater force. This increased collision frequency and force leads to a higher rate at which the solute dissolves. When the solubility limit is reached, additional sugar will not dissolve, indicating that the solution has become saturated.

Furthermore, solubility curves can help to visualize the relationship between solubility and temperature. They show that while the solubility of most solid substances tends to increase with temperature, the magnitude of this effect can vary significantly between different solutes.

Changing the temperature of the solvent increases the solubility of sugar, allowing more sugar to dissolve in warm water. This is demonstrated through solubility curves that show higher solubility at higher temperatures.

Your hypothesis investigates the relationship between temperature and the solubility of sugar in a liquid (solvent). To test this hypothesis, you changed the temperature of the solvent and measured the solubility of the sugar. Generally, as the temperature of a solution increases, it can hold more solute, hence more sugar dissolves in warm water compared to cold water. This can be visualized using solubility curves, which show how solubility changes with temperature.

For example, when a saturated sugar solution is heated, more sugar can dissolve because warm solutions have higher solubility. This demonstrates that increasing temperature generally increases the solubility of many solid substances.

Internal stimuli are changes to the inside of ones body. The only choice that occurs on the inside is D) a decrease in oxygen levels in the blood during exercise.

air temperature change, artificial light, and water availability are all EXTERNAL STIMULI  

Hope this helped!

~Just a girl in love with Shawn Mendes

Answer:

The amount of CO2 in the atmosphere has increased dramatically due to(mainly) excessive burning of fossil fuels.

Answer:

Answer:

acid: sulphuric acid (H2SO4)

base: sodium hydroxide (2NaOH)

Explanation:

Final answer:

Sulfuric acid (H2SO4) and sodium hydroxide (NaOH) react to form water and sodium sulfate (Na2SO4) in a neutralization reaction.

Explanation:

The acid and base that react to form water and sodium sulfate are sulfuric acid (H2SO4) and sodium hydroxide (NaOH). The reaction between these two substances is a classic example of an acid-base neutralization, which results in the formation of water (H2O) and a salt, in this case, sodium sulfate (Na2SO4). The balanced chemical equation for this neutralization reaction is:

H2SO4 (aq) + 2NaOH (aq) → Na2SO4 (aq) + 2H2O(l)

Since sulfuric acid is a diprotic acid, it can release two hydrogen ions (H+), and therefore, it requires two moles of the strong base sodium hydroxide, which provides hydroxide ions (OH-), to completely neutralize it. The resulting salt, sodium sulfate, is highly soluble in water.

False. Because atom of the equal chemical factors do no longer have identical mass due to the fact variety of protons inside the nucleus is the equal for all atoms of the same element however the neutron is not.

Isotopes of any given element all include the same range of protons, in order that they have the identical atomic number (for example, the atomic quantity of helium is constantly 2). Isotopes of a given detail include special numbers of neutrons, therefore, special isotopes have one-of-a-kind mass numbers.

All atoms of an element have an equal quantity of protons, and every element has a distinct range of protons in its atoms. As an instance, all helium atoms have two protons, and no different elements have atoms with two protons.

Atoms of a given element are equal in size, mass, and different homes. Atoms of various factors range in size, mass, and different residences. Atoms cannot be subdivided, created, or destroyed. Atoms of different elements can integrate into easy whole range ratios to form chemical substances.

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Answer:

hypothesis

Explanation:

a question that can be answered wity a hypothesis is a question a scientist can answer

Science can answer questions that can be tested through observations and experiments. It relies on empirical evidence and the scientific method to provide explanations for natural phenomena. Scientific inquiries involve formulating hypotheses, conducting experiments, and analyzing results to draw conclusions.

The realm of science is vast, encompassing everything from the minuscule particles of physics to the vast complexities of biological ecosystems. The types of questions that science can answer are those that can be measured, tested, and observed. Whether it's understanding the laws of physics, exploring chemical reactions, or uncovering the intricacies of living organisms, science seeks to provide concrete explanations based on systematic studies. In essence, science is equipped to answer questions that have the potential for empirical verification and reproducible results. It's this empirical nature that sets scientific knowledge apart from other forms of understanding. However, there are questions that science may not be able to answer, such as those rooted in personal beliefs, morals, and the supernatural, as these cannot be observed or measured in the same way.

Answer:

The specific heat of the unknown substance is 1.22 J/g.°C.

Explanation:

Heat lost by substance (Qc) = Heat gained by the water (Qw) ,

- (Qc) = (Qw).

Qw = m.c.ΔT,

where, Qw is the amount of heat released to water (Q = ??? J).

m is the mass of water (m = 110.0 g).

c is the specific heat capacity of solution (c = 4.18 J/g.°C).

ΔT is the difference in T (ΔT = final temperature - initial temperature = 32.4°C - 24.2°C = 8.2°C).

∴ Q = m.c.ΔT = (110.0 g)(4.18 J/g.°C)(8.2°C) = 3770.36 J.

(Qc) = m.c.ΔT,

where, Qc is the amount of heat lost by substance (Qc = - 3770.36 J).

m is the mass of water (m = 42.5 g).

c is the specific heat capacity of solution (c = ??? J/g.°C).

ΔT is the difference in T (ΔT = final temperature - initial temperature = 32.4°C - 105.0°C = -72.6°C).

∴ (- 3770.36 J) = (42.5 g)(c)(-72.6°C).

∴ c = (- 3770.36 J)/(42.5 g)(-72.6°C) = 1.222 J/g.°C.

Answer:

Hydrogen’s nucleus is electron deficient when it bonds with an electronegative atom.

Explanation:

Hydrogen bonding is only possible with hydrogen since Hydrogen’s nucleus is electron deficient when it bonds with an electronegative atom.

Hydrogen bonding is only possible with hydrogen because of its unique properties. When hydrogen bonds with electronegative atoms, it becomes partially positive and attracts the partial negative charge on the other atom, creating a strong electrostatic attraction. Hydrogen bonding is stronger compared to other bonds and is specific to hydrogen.

Hydrogen bonding is only possible with hydrogen because of its unique properties. When hydrogen bonds with a highly electronegative atom like oxygen, nitrogen, or fluorine, it becomes partially positive due to the unequal sharing of electrons. This partial positive charge on hydrogen allows it to attract the partial negative charge on the electronegative atom, creating a strong electrostatic attraction known as a hydrogen bond.

Hydrogen bonding is stronger compared to other types of bonds like covalent or ionic bonds. This is because hydrogen bonding involves the attraction between partially charged atoms, while covalent bonds involve sharing electrons between atoms. The difference in electronegativity and unequal sharing of electrons in hydrogen bonding contribute to its strength and specificity to hydrogen.

In addition to being electronegative, hydrogen is also a relatively small atom. This allows for closer approach between the hydrogen atom and atoms of other elements, maximizing the strength of hydrogen bonds.

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Answer:

A + BC → AB + C "single replacement reaction" while ammonia synthesis is a "synthesis reaction".

Explanation:

A single replacement reaction, is a reaction by which one element replaces an/other element in a compound.

It can be represented generically as: A + B-C → A-C + B This will most often occur if A is more reactive than B, thus giving a more stable product.

A synthesis reaction is a type of chemical reaction in which two or more simple substances combine to form a more complex product. The reactants may be elements or compounds, while the product is always a compound.

Example: ammonia synthesis,

N₂ + 3H₂ ⇄ 2NH₃

Answer:

Explanation:

Reaction rate is a measure of the speed of a chemical reaction. There are many theories that have been put forward to explain reaction rates. One of which is the collision theory.

The collision theory postulates that for a reaction to occur, there must be collisions between reacting particles. This implies that the number of successful or effective collision of particles determines the rate of a chemical reaction. For a collision to be successful, the particles must be properly oriented and equiped with adequate energy for the reaction.

One of the key component of the energy required for effective collision is temeperature. The  number of effective collision and consequently the rate of chemical reactions are directly proportional to the temperature at which the reaction occurs. With increasing temperature, the activation energy becomes activated and the number of collision increases.

Answer:

the right side of the arrow.

Explanation:

reactants are on left because they are the ones reacting. products are on the right because they are the final products.

Answer: you gota show the digram for me to help dude

Explanation:

The diagram that represents the phase that occurs after a solid melts is Diagram 4.

Diagram 1 - This shows a tightly packed arrangement of blue spheres, which is representative of the solid state of matter. In the solid phase, the particles (atoms, molecules, or ions) are closely packed together in a fixed, crystalline structure.

Diagram 2 - This shows a more dispersed arrangement of yellow circles, which is representative of the gaseous state of matter. In the gas phase, the particles have high kinetic energy and are spread out, occupying the full volume of their container.

Diagram 3 - This shows a less tightly packed arrangement of red spheres compared to Diagram 1, which is characteristic of the liquid state of matter. In the liquid phase, the particles have more freedom of movement compared to the solid state, but are still in close proximity to each other.

Diagram 4 - This grid-like pattern is most representative of the liquid phase that occurs after a solid substance melts. When a solid is heated and reaches its melting point, the particles gain enough kinetic energy to break free of the fixed, crystalline structure and adopt a more fluid, liquid arrangement shown in Diagram 4.

Answer:

Rate = (0.64 M²/min) [A]¹[B]²

Explanation:

1) Determination of the orders of A & B:

The rate law of the reaction = k [A]ᵃ[B]ᵇ

where, k is the rate law constant,

a is the order of the reaction with respect to reactant A,

b is the order of the reaction with respect to reactant B.

This is initial rate method problem:

From trial 1 & 2:

Reactant [A] has the same concentration in both trials, but [B] has different concentrations and the rate of the reaction changes, so the reaction rate depends on [B].

From trial 1, Rate₁ = k [A₁]ᵃ[B₁]ᵇ, [1.2 × 10⁻² M/min] = k [0.30 M]ᵃ[0.25 M]ᵇ

From trial 2, Rate₂ = k [A₂]ᵃ[B₂]ᵇ, [4.8 × 10⁻² M/min] = k [0.30 M]ᵃ[0.50 M]ᵇ

By dividing Rate₁ / Rate₂:

Rate₁ / Rate₂ = k [A₁]ᵃ[B₁]ᵇ / k [A₂]ᵃ[B₂]ᵇ

[1.2 × 10⁻² M/min] / [4.8 × 10⁻² M/min] = k [0.30 M]ᵃ[0.25]ᵇ / k [0.30 M]ᵃ[0.50 M]ᵇ

0.25 = [0.50]ᵇ

Taking log for both sides; log(0.25) = b log(0.5)

b = log(0.25) / log(0.5) = 2.

The reaction is second order with respect to reactant B.

By the same way for reactant A:

From trial 2 & 3:

Reactant [B] has the same concentration in both trials, but [A] has different concentrations and the rate of the reaction changes, so the reaction rate depends on [A].

From trial 2, Rate₂ = k [A₂]ᵃ[B₂]ᵇ, [4.8 × 10⁻² M/min] = k [0.30 M]ᵃ[0.50 M]ᵇ

From trial 2, Rate₃ = k [A₃]ᵃ[B₃]ᵇ, [9.6 × 10⁻² M/min] = k [0.60 M]ᵃ[0.50 M]ᵇ

By dividing Rate₂ / Rate₃:

Rate₂ / Rate₃ = k [A₂]ᵃ[B₂]ᵇ / k [A₃]ᵃ[B₃]ᵇ

[4.8 × 10⁻² M/min] / [9.6 × 10⁻² M/min] = k [0.30 M]ᵃ[0.50 M]ᵇ / k [0.60 M]ᵃ[0.50 M]ᵇ

0.50 = [0.50]ᵃ

Taking log for both sides; log(0.50) = a log(0.5)

a = log(0.50) / log(0.50) = 1.

The reaction is first order with respect to reactant A.

The rate law of the reaction will be: Rate = k [A]¹[B]²

The overall order of the reaction is third order reaction.

2) Determining the rate law constant:

Taking data of trial 1:

Rate = k [A]¹[B]²

[1.2 × 10⁻² M/min] = k [0.30 M]¹[0.25 M]²

k = [1.2 × 10⁻² M/min] / [0.30 M]¹[0.25 M]² = 0.64 M²/min.

So, the rate law will be: Rate = (0.64 M²/min) [A]¹[B]²

Answer:  Very big number

Explanation:

wow

carbon atoms can form chains thousands of atoms long.

Answer:

thousands

Explanation:

Carbon atoms can form chains thousands of atoms long.

Answer:

The answer is C

Explanation:

"The general structure and physical properties of the interior of the earth are inferred through the analysis of seismic waves." This is quoted from what I am currently learning and if you were to do proper research it would tell you the same.

How it works.

"These waves are created by the energy released during earthquakes. The path of seismic waves through the earth is recorded by a world-wide network of seismographs which are located at earthquake monitoring facilities. The path of the seismic waves may be traced from an earthquake's epicenter  through the earth as they are received at numerous sites around the world. "Taken from my textbook.