What is the atomic number, icon, mass of potassium?

This should be EASY!

Answer:

6.533 × 10^-21J

Explanation:

The energy of the microwave photon can be calculated using:

E = hf

Where;

E = energy of photon (J)

h = Planck's constant (6.626 × 10^-34 J/s)

f = frequency (9.86 x 10^12 Hz)

Hence, E = hf

E = 6.626 × 10^-34 × 9.86 x 10^12

E = 65.33 × 10^(-34 + 12)

E = 65.33 × 10^(-22)

E = 6.533 × 10^-21J

The energy of the microwave photon is

6.533 × 10^-21J

KOH is a strong base, so [OH-] = 0.10 M = 1.0 x 10^-1 M

[H+][OH-] = Kw

Kw = 1.0 x 10^-14

[H+] = 1.0 x 10^-14 / 1.0 x 10^-1 = 1.0 x 10^-13 M

Explanation:

2/1×1.25

=2.5 mole of NaCl are produced

weight of NaCl produced = moles × molar mass of NaCl

weight of NaCl produced = 2.5×58.5

weight of NaCl produced =146.5 grams

Answer:

Commensalism

Explanation:

Commensalism is an association between two organisms in which one benefits and the other derives neither benefit nor harm. The Spanish moss benefits and the oak tree neither benefits nor is harmed.

Answer:

The energy changes forms.

Explanation:

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Answer:

The energy changes forms.

Explanation:

When the child is at point A or B, it has maximum gravitational potential energy (because height is maximum), and kinetic energy increases as the child moves away from from the extreme points and towards the midpoints between them.

The first option is not possible as energy cannot b used up, it can only be transformed from one form to another.

The second option is wrong because energy cannot increase without external energy being put into the system

The third option, while technically accurate, doesn't have any information in the question backing it up (for example, if it was said that the child was slowing down).

Hope this helps!

Answer:

The new volume will be 9.24 mL.

Explanation:

Charles's law determines that for a given sum of gas at constant pressure, as the temperature increases, the volume of the gas increases and as the temperature decreases, the volume of the gas decreases.

So, Charles's law is a law that says that when the amount of gas and pressure are kept constant, the quotient that exists between the volume and the temperature will always have the same value:

\(\frac{V}{T} =k\)

When studying an initial state 1 and a final state 2, it is satisfied:

\(\frac{V1}{T1} =\frac{V2}{T2}\)

In this case:

Replacing:

\(\frac{8.70 mL}{318.2 K} =\frac{V2}{337.8 K}\)

Solving:

\(V2=337.8K*\frac{8.70 mL}{318.2 K}\)

V2= 9.24 mL

The new volume will be 9.24 mL.

Replacement  reaction.

Given

A chemical reaction

AB + C → CB + A

Required

reaction type

Solution

There are several types of reactions that can occur

synthesis: 2 elements combine to form a single product

polymerization: monomers combine to produce a polymer

decomposition: One compound breaks down into 2 components

oxidation : a change in oxidation number

replacement can be divided into 2

single replacement if one element replaces the other elements of a compound

double replacement if there is an ion exchange between two ion compounds in the reactant to form two new ion compounds

AB + C → CB + A

If we look at this reaction, element C replaces element A to form a new compound CB. So it is single replacement. But this reaction can also be said to be an oxidation-reduction reaction because there is a change in oxidation number

element A undergoes a reduction reaction

element C undergoes an oxidation reaction

So types of redox reactions can be combination, decomposition, displacement, combustion, and disproportion.

Answer:

oxidation

Explanation:

i passed and got 100%

Answer:

9000J

Explanation:

Given parameters:

Mass of the jet fighter  = 5kg

Velocity  = 60m/s

Unknown:

Kinetic energy of the jet fighter  = ?

Solution:

The kinetic energy of a body is the energy due to motion of the body.

It is mathematically expressed as;

    K.E  = \(\frac{1}{2}\) m v²

m is the mass

v is the velocity

 So;

     K.E  =  \(\frac{1}{2}\)  x 5 x 60²  = 9000J

Answer:

brain HSHSHSHSHHSSHSHS

For the process of dissolving a soluble ionic solid in a sealed container, we would expect the rate of dissolving to be equal to the rate of crystallization of the ions.

When an ionic solid dissolves in a solvent, the solid breaks down into its constituent ions, which then interact with the solvent molecules to form a solution.

In a sealed container, the concentration of ions in the solution will increase over time as more solid dissolves. However, as the concentration of ions increases, the rate at which the solid dissolves will decrease, and the rate at which the ions recombine to form solid will increase.

Eventually, a dynamic equilibrium will be established, where the rate of dissolving is equal to the rate of crystallization.
Therefore, for a sealed container containing a soluble ionic solid, we would expect the rate of dissolving to be equal to the rate of crystallization of the ions, resulting in a dynamic equilibrium.

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Answer:

Diastereomers can have different physical properties and reactivity. They have different melting points and boiling points and different densities.

To precipitate 16.0 g of AgBr from a solution containing 0.420 mol of Ag, 0.143 L of a solution containing 0.200 M KBr is required.

"The amount of space an object or substance occupies" is the definition of volume, which is a scalar quantity. It is a measurement of an object's or substance's three-dimensional extent and is typically expressed in length-cubed units like cubic meters (m3), liters (L), or cubic centimeters (cm3).

                     AgNO3 + KBr = AgBr + KNO3

                                      mass = moles x molar mass

                                           = 0.420 mol x 247.8 g/mol

                                                    = 104 g

                            V = m / M x n  

                               = 16 / (0.200 x 0.420)

                                 = 0.143 L.

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Solubility rules are used to predict the outcome of precipitation reactions, which involve the formation of insoluble products.

Solubility rules are guidelines that help predict the solubility of different compounds in water. These rules are based on the general principles of ionic interactions and the solubility of common ionic compounds. When two soluble compounds are mixed together, a precipitation reaction may occur if the resulting compound formed is insoluble in water.

In precipitation reactions, the reactants are typically aqueous solutions of two different compounds. The solubility rules are used to determine if a precipitate will form by identifying the combination of ions that can form an insoluble compound. The rules state that certain combinations of ions will result in the formation of insoluble products, while others will remain soluble in water.

In conclusion, solubility rules are used to predict precipitation reactions, which involve the formation of insoluble products. These rules help determine whether certain combinations of ions will result in the formation of a precipitate or if the compounds will remain soluble in water. By understanding the solubility properties of different ions, scientists and chemists can predict the outcome of chemical reactions and better understand the behavior of substances in solution.

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The advantage to performing the reaction in methyl ethyl ketone - a solvent with a high boiling point is to carry the reaction in the forward direction by refluxing the set.

Boiling point is defined as the bulk phenomenon. It is the temperature at which the pressure of atmosphere is equal to the pressure of the vapour or vapour pressure.

Since, high boiling point solvent are used during the procedure to reflux the set which help in carrying out the reaction in the forward direction. If we had used low boiling point solvent instead of high all of the solvent evaporated and refluxing of the mixture of reaction to get product for maximum production could not have been possible.

Thus, we concluded that the advantage to performing the reaction in methyl ethyl ketone - a solvent with a high boiling point is to carry the reaction in the forward direction by refluxing the set.

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\(\qquad\qquad\huge\underline{{\sf Answer}}\)

Convection is a method of heat transfer that causes heat to be transferred from one object to another object with being in actual contact but I same atmosphere.

So, the correct phenomenon that describes how heat is transferred by Convection is :

Statement 2. Warmer air rises and copl air sinks.

The pressure head of a point equivalent to 108 cm of water is approximately 85 mm of Hg.

To determine the pressure head in mm of Hg, we need to convert the given pressure head in cm of water to mm of Hg using the specific gravity of mercury (Hg).

The specific gravity of mercury (Hg) is given as 13.6, which means it is 13.6 times denser than water.

First, let's convert the given pressure head of 108 cm of water to meters:

Pressure head (m) = Pressure head (cm) / 100

= 108 cm / 100

= 1.08 m

Next, we can calculate the pressure exerted by water using its specific weight:

Pressure (Pa) = Specific weight of water (N/m³) × Pressure head (m)

= 9800 N/m³ × 1.08 m

= 10584 N/m²

Now, let's convert the pressure from Pascals to mm of Hg using the specific gravity of Hg:

Pressure (mm of Hg) = Pressure (Pa) / (Specific gravity of Hg × Specific weight of water (N/m³))

= 10584 N/m² / (13.6 × 9800 N/m³)

≈ 0.085 m of Hg

≈ 85 mm of Hg

The pressure head of a point equivalent to 108 cm of water is approximately 85 mm of Hg.

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Provide a few solutions and explain why they should be effective. Make a succinct conclusion. Provide a succinct summary of what you wrote. A good response.

What might a solution look like?

A good example of a solution is a mixture of salt and sugar. Any solution can be broken down into different parts. Solid, liquid, and gaseous solutions can be classified as solutions based on the physical states of the solvent and solute. Both the solute and the solvent have a solid in solid solutions. For instance, mixtures of polymer and ceramic.

What various categories of water-based solutions are there?

1. Depending on whether the solution contains water or not, different kinds of solutions on water as a solvent can be divided into two categories. the mixture in which freshwater acts as just a solvent and any state of homogenous component totally dissolves in it.

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Answer:

The answer is A. Lithium and Sodium

Explanation:   • Electronegativity is the tendency of an atom to attract the electrons in a bond towards it. • Ionization energy is the energy that should be given to a neutral atom to remove an electron from it. The difference in the electronegativity between the two elements is quite small, but the main reason for it is because chlorine is one period below oxygen. Chlorine’s valence electrons are thus less tightly bound than those of oxygen, so they would have lower first ionization energy. Does sodium or potassium have larger ionization energy?

Na is reducing Br is oxidizing

K is reducing Cl is oxidizing

Ca is reducing O2 is oxidizing

In a redox (reduction-oxidation) reaction, there are two important species: the oxidizing agent and the reducing agent.

The oxidizing agent is the species that accepts electrons from another species in the reaction, causing oxidation. It itself gets reduced in the process, which means it gains electrons.

The reducing agent, on the other hand, is the species that donates electrons to another species in the reaction, causing reduction. It itself gets oxidized in the process, which means it loses electrons.

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The mass number is the atomic mass rounded to a whole number, i.e., which is a value that rounds the atomic weight to a near number.

The expression mass number is used in chemistry to denote the total amount of subatomic particles i.e. atomic protons and neutrons, which are present in a given atom (for example hydrogen has only one proton and one neutron).

Therefore, with this data, we can see that mass number denotes the overall amount of protons and neutrons present in a given atom, which is equal to one in the hydrogen atom

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The order of ionic compounds by lattice energy from highest to lowest is CaO > AlCl₃ > MgO > NaCl. Lattice energy is a measure of the strength of the electrostatic forces holding the ions in an ionic compound together.

The greater the lattice energy, the stronger the ionic bond. The lattice energy depends on the charge and size of the ions in the compound. The smaller the size of the ions and the higher the charge, the greater the lattice energy.

The following ionic compounds are listed in order of increasing lattice energy:
1. NaCl (sodium chloride)
2. MgO (magnesium oxide)
3. AlCl₃ (aluminum chloride)
4. CaO (calcium oxide)

The highest lattice energy is found in CaO, followed by AlCl3, MgO, and NaCl.
CaO has the highest lattice energy due to the smaller size of its ions and the higher charge on the ions. Calcium ions (Ca⁺) are smaller than sodium ions (Na⁺) and magnesium ions (Mg²⁺), and oxygen ions (O²⁻) are smaller than chloride ions (Cl-). The higher charge on the ions in CaO also contributes to the higher lattice energy.

AlCl₃ has the second highest lattice energy due to the small size of the ions and the high charge on the aluminum ion (Al³⁺). MgO has the third highest lattice energy due to the smaller size of the ions compared to NaCl. NaCl has the lowest lattice energy due to the larger size of the ions and the lower charge on the ions.

In summary, the order of ionic compounds by lattice energy from highest to lowest is CaO > AlCl₃ > MgO > NaCl.

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The given reaction involves the reaction of calcium oxide  with water  to form calcium hydroxide. Therefore, the correct answer is option B: Calcium hydroxide.

When calcium oxide , also known as quicklime or burnt lime, reacts with water , a highly exothermic reaction occurs. The reaction can be represented by the chemical equation:

\(CaO(s) + H_{2} O(l)\) → \(Ca(OH)_{2} (s)\)

In this reaction, the calcium oxide  combines with water  to produce calcium hydroxide , also known as slaked lime or hydrated lime. Calcium hydroxide is a white, crystalline solid that is sparingly soluble in water.

The reaction is a classic example of a base reacting with water to produce a hydroxide compound. Calcium hydroxide is commonly used in various applications such as in the construction industry, as a flocculant in water and wastewater treatment, and in the production of cement, among others.

To summarize, the product(s) of the given reaction \(CaO(s) + H_{2} O(l)\) → \(Ca(OH)_{2} (s)\)is calcium hydroxide .

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The partial pressure of \($Cl_2$\) in the mixture is 3.25 atm. The partial pressure of a gas in a mixture is the pressure that gas would exert if it alone occupied the volume of the mixture at the same temperature.

To calculate the partial pressure of \($Cl_2$\) in the given mixture, we need to use the ideal gas law, which relates the pressure, volume, temperature, and number of moles of a gas:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature.

We can rearrange this equation to solve for the number of moles of a gas:

n = PV/RT

Now, we can use the given asses of \($Cl_2$\) and N2 to calculate the number of moles of each gas:

\($n(Cl_2)=\frac{m(Cl_2)}{M(Cl_2)}$\)

= 35.45 g / 70.91 g/mol

= 0.499 mol

\($n(N_2)=\frac{m(N_2)}{M(N_2)}$\)

= 28.02 g / 28.01 g/mol

= 0.999 mol

The total number of moles of gas in the mixture is the sum of the moles of \($Cl_2$\) and N2:

n(total) = n(\($Cl_2$\)) + n(\($N_2$\)) = 1.498 mol

Now, we can use the total pressure of the mixture to calculate the partial pressure of \($Cl_2$\):

\($P(Cl_2)=\frac{n(Cl_2)RT}{V}$\)

= \($(0.499\text{ mol})\left(\frac{0.08206\text{ L}\cdot\text{atm}}{\text{mol}\cdot\text{K}}\right)(298\text{ K})/V$\)

Similarly, we can calculate the partial pressure of N2:

\($P(N_2)=\frac{n(N_2)RT}{V}$\)

= \($(0.999\text{ mol})\left(\frac{0.08206\text{ L}\cdot\text{atm}}{\text{mol}\cdot\text{K}}\right)(298\text{ K})/V$\)

The sum of the partial pressures must equal the total pressure:

\($P(Cl_2)+P(N_2)$\) = 6.0 atm

Substituting the expressions for P(\($Cl_2$\)) and P(\($N_2$\)) and simplifying, we get:

\($(0.499\text{ mol})\left(\frac{0.08206\text{ L}\cdot\text{atm}}{\text{mol}\cdot\text{K}}\right)(298\text{ K})/V + (0.999\text{ mol})\left(\frac{0.08206\text{ L}\cdot\text{atm}}{\text{mol}\cdot\text{K}}\right)(298\text{ K})/V$\)

= 6.0 atm

Solving for V, we get:

V = 2.28 L

Now, we can substitute the value of V into the expression for P(\($Cl_2$\)) and simplify to get:

\($P(Cl_2)=\frac{(0.499\text{ mol})\left(\frac{0.08206\text{ L}\cdot\text{atm}}{\text{mol}\cdot\text{K}}\right)(298\text{ K})}{2.28\text{ L}}$\)

= 3.25 atm

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Answer:

Bro its expired milk duh

Explanation:

Answer:

9.69g

Explanation:

Xmol of n2= 7.774/22.4= 0.346 mole

molar mass of n2 2×14 =28g/Mol

Mas of n2= 0.346×28

Mas of n2=9.69grams

Explanation:

Number 1

Q = 4280J

mass = x

∆∅ = 34.5 - 22

∆∅ = 12.5°C

Specific heat capacity of water = 4200J

Q = mc∆∅

4280 = x(4200)(12.5)

4280 = 52500x

x = 4280/52500

x = 0.0815kg

Number 2

c = x

Q = 3750

m = 315g

∆∅ = 78 - 28.4

∆∅ = 49.6°C

Q = mc∆∅

3750 = 315×x×49.6

3750 = 15624x

x = 3750/15624

x = 0.2400J(g°C)-¹

Number 3

c = 0.448

Q = 35000

m = 454g

∆∅ = x

Q = mc∆∅

35000 = 454(0.448)(x)

35000 = 203.392x

x = 35000/203.392

x = 172.0815

∅2 - ∅1 = ∆∅

∅2 = ∆∅ + ∅1

∅2 = 172.0815 + 24

∅2 = 196.0815

∅2 = 196°C

Number 4

Q = 8750J

m = 75g = 0.075

c = 4200J/kg/°C

∆∅ = x

Q = mc∆∅

8750 = 0.075(4200)∆∅

8750 = 315×x

x = 8750/315

x = 27.7778

∅2 - ∅1 = 27.7778

∅2 = 27.7778 + ∅1

∅2 = 27.7778 + 23

∅2 = 50.7778

∅2 = 50.8°C

Number 5

Q = 38800J

c = 0.448J/(g°C)

∆∅ = 178 - 24.5

∆∅ = 153.5°C

m = x

Q = mc∆∅

38800 = x × 0.448 × 153.5

38800 = 68.768x

x = 38800/68.768

x = 564.2159

x = 564g

Carrier proteins serve many purposes in the purposes in the attempt to move molecules across a plasma membrane.

Carrier proteins are proteins which are found n the surfaces of cell membranes which serve the function of transporting molecules across the cell membrane barrier.

The carrier proteins transport various molecules across the cell membrane.

Carrier proteins transport such molecules as sugars, proteins, ions, lipids across the membrane.

Some carrier proteins expend energy in the form of ATP when they transport molecules across the cell membrane.

Some use the concentration gradient of cells to transport molecules across the cell membrane.

The carrier proteins which expend energy to transport molecules are involved in active transport.

The carrier proteins that do not expend energy are involved in passive transport.

In conclusion, carrier proteins are essential in the transport of molecules across the plasma membrane.

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Answer:

Free Energy (G) can either increase or decrease for a reaction when the temperature increases. It depends on the entropy (S) change. The change in a quantity is represented by the Greek letter delta. ... Hence, when the temperature increases the numeric value of the free energy becomes larger.

Explanation:

The change in Gibbs free energy (ΔG) of a chemical reaction depends on the initial and final states of the reactants and products, as well as on the temperature and pressure conditions of the reaction.

The Gibbs free energy of a reaction tells us whether a reaction is spontaneous or not under given conditions, with negative ΔG values indicating a spontaneous reaction and positive ΔG values indicating a non-spontaneous reaction.

The temperature of the reactants and products is important in determining the Gibbs free energy change because the Gibbs free energy change is related to the enthalpy change (ΔH) and the entropy change (ΔS) of the reaction through the equation:

ΔG = ΔH - TΔS

where T is the temperature in Kelvin.

Thus, the temperature of the reactants and products must be known in order to calculate the Gibbs free energy change of a reaction accurately.

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