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Answer:

1. Crush the sugar into powder.

2. Heat the water.

3. Dissolve it by stirring continuously

Explanation:

1. Crushing the sugar into powder increases surface area. So it increases the changes of dissolving

2. Heating the water increases the capacity of water to dissolve sugar.

3. Stirring continuously increases randomness of particles so eases mixing up thus increasing dissolving tendency.

Answer:

E = 9.93 x 10^-14 J

Explanation:

Wavelength, λ = 2.00 x 10-12 m

Energy, E = ?

Relationship between both quantities is given as;

E = hc/λ

where;

c = speed of light = 2.998  ×  10 8  m⋅s −1

h = Plank's constant = 6.626*10-34 Js

Solving for E;

E = 6.626*10^-34 * 2.998  ×  10^ 8 / 2.00 x 10^-12

E = 9.93 x 10^-14 J

The binding energy of silver-109 (Ag-109) in kJ/mol nucleons is not a well-defined concept, as binding energy is typically calculated for atomic nuclei rather than individual isotopes.

The binding energy of an atomic nucleus is the energy required to completely separate all of its constituent protons and neutrons into individual particles. It is usually expressed in units of energy per nucleon, which is the energy required to separate one proton or neutron from the nucleus.

The average binding energy per nucleon for an atomic nucleus is typically highest for medium-mass nuclei, such as those found in the region of the so-called "valley of stability" on the nuclear chart.

The binding energy per nucleon for silver-109 is not likely to be particularly high, as silver is a relatively heavy element and the binding energy per nucleon tends to decrease with increasing atomic number (Z).

Without more information about the specific calculation being used to determine the binding energy of Ag-109, it is not possible to accurately provide a value for the binding energy in kJ/mol nucleons.

The required masses (g/mol) are also not specified in the question, so it is not clear what context these values might be used in.

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Answer:

Both neutrons and protons

Explanation:

Both neutrons and protons are assigned as having masses of 1 amu each. In contrast, the electron has a negligible mass of . 0005 amu.

Answer:

12 grams and I have to write something longer so just ignore this

Answer:

Can volume alone be used to predict whether an object will sink or float? -No, you need both mass and volume to find its density to see if it can float.

The volume of 8.8g of carbon dioxide at STP is 4.38 L.

1 mole of any gas will take up 22.4 L of space at standard temperature and pressure (STP). A balanced chemical equation and the Ideal Gas Law can be used to determine the amount or mass of gas consumed or created in a chemical process.

n = m/M

where m is the molar mass of carbon dioxide and M is its mass in terms of molecules.

Considering that the molar mass of carbon dioxide is 44.01 g/mol:

n = 8.8 g / 44.01 g/mol

n = 0.1998 mol

Next, we can plug in the values of n, R, P, and T into the ideal gas law and solve for V:

V = (nRT)/P

V = (0.1998 mol x 0.0821 L·atm/(mol·K) x 273.15 K) / 1 atm

V = 4.38 L

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Answer:

Covalent molecular compounds are formed by atoms sharing electrons, C5H12 and SF6 are expected to exist as molecules. In contrast, MgBr2 and Cu(NO3)2 are ionic compounds and would not be expected to exist as molecules.

The valence electrons are located in an atom's outermost energy level

In an atom, there are levels of energy in the shell and subshell  

This energy level is expressed in the form of electron configurations.  

Electrons fill the orbitals based on the Aufbau principle, namely the filling of electrons starts from the lowest energy level

Usually used in describing Lewis structures, placed around the element

Each orbital in an atom consists of 4 quantum numbers  : n, l, ml, ms

Each electron has a different quantum number and this conforms to Pauli's rule: no electrons have the same 4 quantum numbers

Valence electrons are electrons used in a chemical bond , and  in an atom's outermost energy level

Noble gas has a stable electron configuration of 8 valence electrons which guides the formation of chemical bonds called the octet rule

Answer:

Cl-, O²‐, P³‐ have same number of electron i.e. 18

In an equation, 40kJ + 2SO₃ (g) -->2SO₂(g) + O₂(g), if pressure added, the equilibrium shifts to the left side of the reaction because it has fewer moles of gas.

Le Ch atelier's principle states that if the pressure is added in a nay reaction, then the equilibrium will be shifted toward the side where there are fewer atoms.

In this case, there are fewer moles on the left side.

Thus, when pressure is added, the equilibrium shift to the left side due to Le Ch atelier's principle.

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Chemical equilibrium is a dynamic equilibrium that is affected by changes in temperature, concentration and pressure

Chemical equilibrium is a dynamic state in a chemical reaction in which the rate of forward reaction is equal to the rate of backward reaction.

For a reaction in equilibrium, the following factors affect equilibrium:

The principle of chemical equilibrium states that in an isolated system in equilibrium, equilibrium will shift to annul any constraint applied in the system.

Therefore, chemical equilibrium is dynamic and is affected by temperature, concentration and pressure.

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Answer:

Repulsive forces exist only when atoms are very close to each other. (3/14) "They [the atoms] will approach until both nuclei will simply shove each other because both of them are positive." The balance between the attraction and repulsion forces determines how close the atoms can get. The relationships between the magnitude and direction of repulsive and attractive forces. A stable state of a bond is when attractive forces balance repulsion forces. “A stable state between two atoms is when they attract each other with a force that equals the force that they repel each other.”

Answer: A, C, E

Explanation: PLATO. all testable questions.

Fatty acids are present in all lipids. Choice (d) is the claim that is untrue: "All lipids contain fatty acids."

Fatty, waxy, or oily molecules are referred to as lipids. They are soluble in organic solvents but insoluble in polar solvents like water. Lipids consist of: Oils and fats (triglycerides)

Lipids are a type of chemical molecules that are found in both plants and animals and are naturally soluble in non-polar solvents. In other words, lipids don't dissolve in water; instead, they do so in solvents like oil, gasoline, ether, and carbon tetrachloride.

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Answer:

Frictional force takes place when 2 object rub against each other

Explanation:

For example:- Ball rolling on the floor (How is the ball moving?... Due to friction)

Answer:

2.5 mole of O2

Explanation:

From the equation we see that we need 5 molecules of oxygen to react with 2 molecules of C2H2.

This means that 5 moles of oxygen molecules are needed to completely react with 2 moles of C2H2, because a mole is a unit of particle count.

From that we can infer that to react with 1 mole of C2H2 we need half of 5 moles of oxygen - so 2.5 mole of oxygen molecules.

Answer:

Explanation: Diamond and graphite are made out of carbon atoms. The difference between the two substance is the arrangement of the carbon atoms inside each one.

Answer:

Diamond and graphite are allotropes of carbon

Explanation:

» Diamond has tetrahedral edges associating through weaker vander waal forces of attraction, it is colorless and glittering, and it is very hard.

» Graphite has hexagonal edges associating vander waal forces, it is black in color and it is soft. Example of graphite is the black rod in a dry cell.

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The thermodynamics of the phase transformation from an Al-Cu alloy to pure copper at a given process temperature can be described as:

The transformation is spontaneous, meaning that it occurs without the need for external energy input. This is because the transformation is driven by the release of Gibbs free energy, which is a measure of the energy available to do work in a system. The Gibbs free energy change for the transformation is negative, indicating that the transformation is thermodynamically favorable.

The Gibbs free energy change can be calculated using the following equation:

ΔG = ΔH - TΔS

where ΔG is the Gibbs free energy change, ΔH is the enthalpy change, T is the temperature, and ΔS is the change in entropy.

For the transformation from an Al-Cu alloy to pure copper, the enthalpy change can be calculated using the following equation:

ΔH = ΣHf - ΣHl

where ΣHf is the enthalpy of formation of the pure copper, and ΣHl is the enthalpy of formation of the Al-Cu alloy.

The change in entropy for the transformation can be calculated using the following equation:

ΔS = ΣSf - ΣSl

where ΣSf is the entropy of formation of the pure copper, and ΣSl is the entropy of formation of the Al-Cu alloy.

By combining these equations, we can calculate the Gibbs free energy change for the transformation:

ΔG = ΣHf - ΣHl - ΣSf + ΣSl

If the Gibbs free energy change is negative, the transformation is spontaneous and thermodynamically favorable. Therefore, if the Gibbs free energy change for the transformation is negative at the given process temperature, the transformation will occur spontaneously without the need for external energy input.  

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Full Question ; Assume that the precipitation of pure copper from an Al-Cu alloy is thermodynamically favorable at a given process temperature (i.e., the transformation is spontaneous). How best would you describe the thermodynamics of this phase transformation at this temperature?

The volume of benzaldehyde (ml) is 304.65 mL, if the density of benzaldehyde is 1.045 g/ml and having 3 mol.

Given,

Moles of benzaldehyde = 3 mol

Density of benzaldehyde = 1.045g/mol

Molar mass of benzaldehyde = 106.12 g/mol.

As we know that,

Moles can be calculated as

Moles = Given mass/ molar mass

3 = Given mass/ 106.12

Given mass = 318.36g.

The mass of benzaldehyde is 318.36g.

Now,

Density = mass/ Volume

1.045 = 318.16/ Volume

Volume = 318.36/1.045

Volume = 304.65 mL.

Thus, we find that the volume of benzaldehyde is

304.65 mL.

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Answer:

(s) : Solide

(I) : Liquid

(g) : gas

(aq) : Aqueous

Answer:

2.5mg/s

Explanation:

Hope this helps!

The concentration of hydroxide ions in pure water at 30.0°C can be determined using the equation for the ion product of water, Kw.

Kw is equal to the product of the concentrations of hydrogen ions (H+) and hydroxide ions (OH-) in water. At 30.0°C, the given value of Kw is 1.47×10^-14.

Since pure water is neutral, the concentration of H+ ions is equal to the concentration of OH- ions. Therefore, to find the concentration of hydroxide ions, we can take the square root of Kw.

√(1.47×10^-14) = 1.21×10^-7 M.

Therefore, the concentration of hydroxide ions in pure water at 30.0°C is 1.21×10^-7 M.

In summary, the concentration of hydroxide ions in pure water at 30.0°C is 1.21×10^-7 M, as calculated using the ion product of water equation and the given value of Kw.

It's worth noting that at 30.0°C, pure water is still neutral as the concentration of H+ ions is equal to the concentration of OH- ions.

This equilibrium between H+ and OH- ions results in a pH value of 7, indicating a neutral solution.

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The phase of energy metabolism that often begins with the sight, the smell, or even the thought of food is the cephalic phase.

The cephalic phase is the initial stage of digestion and energy metabolism that occurs before food even enters the body. It involves the sensory stimulation of the brain through visual, olfactory, and cognitive cues associated with food.

When we see, smell, or think about food, our brain sends signals to the digestive system, triggering the release of enzymes and hormones that prepare the body for food intake. This phase includes processes such as increased salivation, gastric acid secretion, and pancreatic enzyme release.

The cephalic phase plays a crucial role in preparing the body for efficient nutrient digestion and absorption, ultimately contributing to overall energy metabolism.

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Answer:

It is true. a) 0.25 mol

Explanation:

Hello there?

To begin solving this problem, you have to write down the chemical equation and make sure it is well balanced.

The chemical equation is;

3Mg(s) + N2(g) => Mg3N2(s)

1 mole of Mg = 24g

We have 18g of Magnesium (Mg) reacting with Nitrogen gas (N2)

From our equation,

Mole ratio = 3 : 1, (Mg : N2)

1 mol Mg = 24g

x mol Mg = 18g

x mol Mg = (18/24) = 0.75 mol Mg

But mole ratio = 3 : 1 (Mg : N2)

This means that 3 => 0.75 mol Mg

What about ratio 1 of N2?

N2 = (0.75 mol ÷ 3)/1

= 0.25 mol N2

I hope this helps you to understand better. Have a nice studies.

The kinetic-molecular theory is a model that describes the behavior of matter at a microscopic level.

In solids, this theory suggests that the particles (atoms or molecules) that make up the solid are in constant motion and are held together by strong intermolecular forces. The particles vibrate about their fixed positions and the amplitude of the vibration increases as the temperature increases. This theory also explains properties such as thermal expansion, specific heat, and thermal conductivity of solids.

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Answer: C

Explanation: The evaporation rate depends on the exposed surface of liquid as long as both glasses stay at the same temperature. Since both glasses have the same surface area, they should both evaporate at the same rate.

The identity of the noble gas is c. Ne (Neon).

To determine the identity of the noble gas, we can use the ideal gas law equation under standard temperature and pressure (STP):

PV = nRT

Where:

P = pressure (atm) at STP, which is 1 atm

V = volume (L)

n = number of moles

R = ideal gas constant (0.0821 L atm/mol K)

T = temperature (in Kelvin) at STP, which is 273.15 K

Rearranging the equation to solve for n:

n = PV / RT

Plugging in the given values:

P = 1 atm

V = 14.09 L

R = 0.0821 L atm/mol K

T = 273.15 K

n = (1 atm * 14.09 L) / (0.0821 L atm/mol K * 273.15 K)

n = 0.5827 mol

Now we need to determine the molar mass of the noble gas using the given mass and moles:

Molar mass = Mass / Moles

Plugging in the given mass:

Mass = 12.69 g

Molar mass = 12.69 g / 0.5827 mol

Molar mass ≈ 21.80 g/mol

Comparing the molar mass to the molar masses of different noble gases, we find that the noble gas with a molar mass close to 21.80 g/mol is Neon (Ne).

Therefore, the identity of the noble gas is Ne (Neon). Therefore, the correct answer is option c.

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500 ml of a solution with an ultimate concentration of 2.7M was made using 75.0 ml of 18.0 m h2so4.

Molarity is defined as the number of moles of a solute dissolved in one liter of the solution. It is denoted by ‘M’ and its unit is moles per liter (mol/L). Formula to calculate Molarity (M): Molarity = Number of moles of solute / Volume of solution (in liters)

Given data: Initial volume of H2SO4 = 75.0 mLInitial molarity of H2SO4 = 18.0 MVolume of a solution prepared = 500 mL = 0.5 LC. converting initial volume of H2SO4 to liters:Initial volume of H2SO4 = 75.0 mL = 75.0/1000 = 0.075 L. Number of moles of H2SO4 used for preparing the solution: Number of moles of H2SO4 = Molarity × Volume.

A numberr of moles of H2SO4 = 18.0 M × 0.075 L. Number of moles of H2SO4 = 1.35 MGiven that the volume of the solution prepared = 500 mL = 0.5 L.

The final molarity of H2SO4 in the prepared solution is given by:Final molarity of H2SO4 = Number of moles of H2SO4 / Volume of solution. Final molarity of H2SO4 = 1.35 M / 0.5 L. Final molarity of H2SO4 = 2.7 M .Therefore, the final concentration of the solution is 2.7 M.

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