-What is the density of the spoon in the units of grams per cubic centimeter if its mass is 30 g, and its
volume 25 mL?

Answer:

c, hydrochloric acid

Explanation:

The frequency of gamma radiation is calculated to be = 1.11 *10^20 Hz.

A gamma radiation is also known as gamma ray. It is a penetrating form of electromagnetic radiation arising from radioactive decay of atomic nuclei. It consists of shortest wavelength electromagnetic waves, even shorter than X-rays.

Gamma rays can pass through the human body completely and as they pass through, they cause ionizations that damage tissue and DNA.

As we know that E= hf

Hence, f= E/h

Given E=  6.96 x 10-14 J

And, Planck's constant, h = 6.626 *10^-34 m² kg/s

f = 6.96 * 10^-14J  +/6.626 *10^-34

f = 1.11 *10^20 Hz

Hence, frequency of gamma radiation = 1.11 *10^20 Hz.

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The carrying capacity of the area was reduced in the year 10 according to the graph that shows the number of foxes on the island over a span of 15 years.

The graph shows a population of foxes over a span of 15 years. The y-axis represents the number of foxes on the island, while the x-axis represents time. The study began with the earlier 0 and ran until the start of year 15. According to the graph, the carrying capacity of the area was reduced in the year 10.

In the graph, it is shown that the population of foxes on Sunday Gill island had a significant increase from year 0 to year 3. After year 3, the fox population started to decrease and then remained fairly constant until year 10. After year 10, the population of foxes on the island started to decline more rapidly until the end of the study in year 15

This decline in the population of foxes on the island is most likely due to the reduction in carrying capacity of the area. Carrying capacity refers to the maximum number of individuals that an environment can sustain. When the carrying capacity of an environment is reached, it means that the environment can no longer provide the necessary resources to sustain the population.  

There are various factors that can cause a reduction in carrying capacity, such as environmental degradation, competition for resources, or a natural disaster. In this case, it is not clear what caused the reduction in carrying capacity in year 10, but it is likely that it was due to some environmental factor that impacted the availability of resources for the fox population.
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Answer:

1. To find the pH of a 0.1 M solution of HNO₂, we first need to calculate the concentration of H+ ions in the solution using the dissociation constant K.

HNO₂ ⇌ H+ + NO₂-

K = [H+][NO₂-]/[HNO₂]

We know that the initial concentration of HNO₂ is 0.1 M, and that the dissociation constant K is 4.5×10^-4. Let x be the concentration of H+ ions in the solution.

K = [H+][NO₂-]/[HNO₂]

4.5×10^-4 = x(0.1-x)/0.1

Simplifying the equation gives us:

x^2 - 4.5×10^-5x + 4.5×10^-6 = 0

Using the quadratic formula, we get:

x = (4.5×10^-5 ± √(4.5×10^-5 - 4(1)(4.5×10^-6))) / 2(1)

x = 1.5×10^-3 or 3×10^-4

Since the concentration of H+ ions must be less than 0.1 M, we reject the larger value and take x = 3×10^-4 M.

To calculate the pH, we use the formula:

pH = -log[H+]

pH = -log(3×10^-4) = 3.52

2. To find the pH of a 0.05 M solution of NHẠOH, we first need to calculate the concentration of OH- ions in the solution using the dissociation constant K.

NHẠOH ⇌ NH₂- + OH-

K = [NH₂-][OH-]/[NHẠOH]

We know that the initial concentration of NHẠOH is 0.05 M, and that the dissociation constant K is 1.8×10^5. Let x be the concentration of OH- ions in the solution.

K = [NH₂-][OH-]/[NHẠOH]

1.8×10^5 = x(0.05-x)/0.05

Simplifying the equation gives us:

x^2 - 1.8×10^-3x + 9×10^-6 = 0

Using the quadratic formula, we get:

x = (1.8×10^-3 ± √(1.8×10^-3 - 4(1)(9×10^-6))) / 2(1)

x = 9.0×10^-3 or 1×10^-3

Since the concentration of OH- ions must be less than 0.05 M, we reject the larger value and take x = 1×10^-3 M.

To calculate the pOH, we use the formula:

pOH = -log[OH-]

pOH = -log(1×10^-3) = 3

To calculate the pH, we use the formula:

pH + pOH = 14

pH = 14 - pOH = 11

3. To find the pH of a 0.3 M solution of H₂S, we first need to calculate the concentration of H+ ions in the solution using the dissociation constant K.

H₂S ⇌ H+ + HS-

K = [H+][HS-]/[H₂S]

We know that the initial concentration of H₂S is 0.3 M, and that the dissociation constant K is 1.0×10^-7. Let

Explanation:

The volume of \(N_2O_5\) needed to produce 9.64 L of \(NO_2\) is 4.97 L, calculated using stoichiometry and the ideal gas equation.

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The answer is 1.09 x \(10^{-35}\) J

To find the energy of a photon with a given wavelength,

                                         E = h x c x λ

You'll obtain an energy result in joules using these units (J).

According to the question,

wavelength, λ = 5.50 x \(10^{-7}\)

speed of light, c = 3 x \(10^{8}\) m/s

Planck's constant, h = 6.62607015 x \(10^{-34}\)  

E = 6.62607015 x \(10^{-34}\)  x  3 x  \(10^{8}\) x  5.50 x \(10^{-7}\)

E = 1.09 x \(10^{-35}\) J

Therefore, the energy of a photon is 1.09 x \(10^{-35}\) J

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Answer:

Substance C

Explanation:

Substance C would be the answer because Substance C has a lower attraction level. Because of this, it takes more energy to take out of in order to become a liquid.

Answer:

130g

Explanation:

For every mole of a substance, there is a molar mass that coincides with the masses on the periodic table. For one mole of H2O, you would add the molar masses of the two hydrogen atoms and the oxygen atom to get 18.016g. You would then take this molar mass and multiple it by the amount of moles present (7.4) to get 133.3184g

From here, you would round to the significant figures to get 130g

Answer:

The answer is in the explanation

(PLS VOTE ME AS BRAINLIEST!!!!!!!!!!!!!)

Explanation:

As Earth rotates on its axis, it orbits the sun, which orbits the center of the Milky Way, which itself is barreling through space.

The pH of the solution is 3.6 and 10.7 respectively

pH is defined as the negative log of the concentration of H⁺ ions and pOH is define as the negative log of the concentration of OH⁻ ions.

The pH is negative logarithm of the concentration of hydronium ion.

pH=-log[\(H^+\)]

pH=-log[2.4x\(10^{-4}\)]

pH=4-log(2.4)

pH=3.6

The concentration of hydronium ion is 4.2x\(10^{-5}\) M. Calculating the pH, we get

pH=-log(4.2x\(10^{-5}\))

pH=4.38

Now calculating the pOH value, we get

pOH=-log[\(OH^-\)]

pOH=-log(4.6x\(10^{-4}\))

pOH=3.33

Now pH+pOH=14

pH=14-3.33

pH=10.7

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The heat made by a mixture of gases is less than that produced by solitary gases of hydrogen or oxygen.

The property becomes a solution of a homogeneous mixture. Some of the effects of gas mixtures are easy to control. if we know the composition of the gases in the mix. In gas mixtures, all components in the gas phase can be used separately. The atmosphere is a mixture of different gases. The part, usually present in solution, first has to be atomized in a flame. Premixed combustion flame, a mixture of fuel and oxidant gas, and diffusion. compared to liquid streams, is relatively simple because the bulk characterization of a single phase is implicit. However, when gas. The heat produced by a mixture of gases is less than that produced by solitary gases. of hydrogen or oxygen.

so we can conclude that the flame appears yellow if there are impurities in the air whereas a pure hydrogen gas flame will not produce any smoke.

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Answer:

7.5 atm

Explanation:

Initial pressure P1 = 1.0 ATM

Initial volume V1= 196 L

Final pressure P2= the unknown

Final volume V2= 26000ml or 26 L

From Boyle's law we have;

P1V1= P2V2

P2= P1V1/V2

P2= 1.0 × 196/26

P2 = 7.5 atm

Therefore, as the air is compressed, the pressure increases to 7.5 atm.

The  inference explains the pressure of gas inside a can by option 1: gas particles collide with and push on the walls of the container

Inference 1 is correct because it describes how the pressure of a gas is generated by the particles colliding with and pushing against the walls of the container.

Inference 2 is correct because it describes how temperature and kinetic energy are related to pressure, which is a key aspect of kinetic theory.

Therefore, Inference 3 is correct because it describes an observation that supports Boyle's Law, which states that the pressure and volume of a gas are inversely proportional. Inference 4 is correct because it describes how scientific theories can evolve over time, which is true of the phlogiston theory.

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The reaction can neither be classified as a syntheisis or as a decomposition reaction since two reactants yield two products.

A synthesis reaction is one in which two or more reactants combine to yield only one product. A decomposition reaction is one in which a single product is broken up to yield two or more products.

The reaction as explained in the question is neither a synthesis reaction nor a decomposition reaction because two reactants form two products.

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The reaction stops because the reaction is a decomposition reaction.

We have to note that there is a reaction when there is change of the reactants that are in the system to the products. We have to note that in this case. we have the decomposition of the mercury oxide.

Since it is a decomposition reaction, we can see that there is a break down of the mercury oxide to give rise to the oxygen and to the mercury as such if we remove the mercury oxide the reaction stops.

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The sample contains 0.986 g of Carbon, 0.107 g of Hydrogen, 0.579 g of Nitrogen, and 0.328 g of Oxygen. This elemental composition matches that of MDMA and not caffeine. There are 0.0099 moles of MDMA present in the sample.

Nitrogen is a colorless, odorless, tasteless, and mostly inert diatomic gas at standard conditions, constituting 78% of Earth's atmosphere. It is the most abundant element in the atmosphere, and is chemically unreactive under normal conditions. It is an essential element in all forms of life, and is a major component in amino acids and proteins. Nitrogen is also found in all plant and animal tissues, and is a necessary nutrient for their growth.

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Answer:

There's no picture, so I can't help witht his, apologies!

Explanation:

The reaction quotient from the calculation is obtained as  12.3

The reaction quotient, Q, is a mathematical expression used in chemistry to predict the direction a chemical reaction will proceed under non-standard conditions.

It is calculated in the same way as the equilibrium constant, K, but uses the concentrations (or partial pressures) of the reactants and products at any given moment during a reaction, rather than at equilibrium.

We already know that the reaction quotient would refer to the non equilibrium conditions. Thus we have that;

Q = [N₂04]/[NO₂]^2

Q = 0.00553/(0.0212)^2

Q = 12.3

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The endothermic reaction PE diagram is characterized by higher energy products and lower energy reactants.

The Potential Energy (PE) diagram represents the potential energy of the reactants and products. The change in potential energy during a reaction is often an indicator of whether the reaction is endothermic or exothermic.Endothermic reactions are those that absorb energy from their surroundings, while exothermic reactions release energy into their surroundings. The potential energy diagram for an endothermic reaction is characterized by a higher energy of products than that of the reactants.In other words, the energy required to break the bonds in the reactants is less than the energy required to form bonds in the products. The reactants are at a lower energy level than the products on the potential energy curve. The graph of PE diagram for an endothermic reaction is as follows: Image depicting a PE diagram for an endothermic reaction. As a result, Option B represents a PE Diagram for an endothermic reaction.

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Answer:

Neutrons and protons

Explanation:

The average atomic mass of an element is the sum of the masses of its isotopes, each multiplied by its natural abundance (the decimal associated with percent of atoms of that element that are of a given isotope).

Provided question is incomplete as it lacks image or diagtram related to the question, however the correct indication is attach with answer :

Answer:

The correct answer is : antibonding molecular orbital

Explanation:

At the point when two atomic orbitals can consolidate directly produce two molecualr orbital, of which one is holding sub-atomic orbital of lower vitality and the other antibonding molecular orbital of higher energy.  

Holding molecular orbital would by and large outcomes which nuclear orbitals of same phase joins while antibonding molecular orbital would results when atomic orbitals of various stages can combine.  

In the given approach, it is obvious that one of S - orbital is going consolidate directly with opposite phase of p - orbital along their inter nuclear axis. Subsequently it prompts the formation of sigma antibonding molecular orbital.

Thus, the correct answer is : antibonding molecular orbital

By the concept of calculating moles ,it can br concluded that the no. of atoms of phosphorus in 8.80mol of copper(II) phosphate is=1.06\(x10^{25}\)

A mole is defined as amount of substance containing as many as elementary entities that are there in atoms of exactly 12 g of carbon-12.Therefore we can say,1 mole of copper(II) phosphate, Cu3(PO4)2, contains three moles of copper(II) cations and two moles of phosphate anions.

Again 1mole of phosphate anions contains one mole of phosphorus and four moles of oxygen.Considering all these informations we can conclude that:1 mole of copper(II) phosphate contains 2 moles of Phosphorus

Accordingle the sample contains=(8.80\(x\)2) moles of Phosphorus

                                    =(17.6\(x\)Avogadro's constant) atoms of  Phosphorus

                                    =(17.6\(x\)6.022\(x\)\(10^{23}\)) atoms of  Phosphorus

                                    =1.06\(x10^{25}\) [approx] no. of Phosphorus atoms

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In 8.80 moles of copper(II) phosphate, there are approximately 1.06 x 10²⁵ atoms of phosphorus.

The number of atoms of phosphorus in a given amount of a compound can be calculated using the concept of mole in chemistry. Copper(II) phosphate is Cu3(PO4)2, containing 2 moles of phosphorus (P) for every 1 mole of the compound. Avogadro's number (6.022 x 10²³) gives the number of atoms in one mole.

So, if there are 8.80 moles of copper(II) phosphate, there would be 2 × 8.80 moles of phosphorus. Multiplying this by Avogadro's number gives the total number of phosphorus atoms.

Therefore, the number of phosphorus atoms is 2 × 8.80 × 6.022 x 10²³ = 1.06 x 10²⁵ atoms of phosphorus.

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Answer:

Avogadro's number is 6.022×1023 molecules. With Avogadro's number, scientists can discuss and compare very large numbers, which is useful because substances in everyday quantities contain very large numbers of atoms and molecules.

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The mass of 0.0750 moles of calcium is 3.01g.

To calculate the mass of calcium we need to use the molar mass that we can find in the Periodic Table of Elements.

The molar mass of calcium is 40.1 g/mol.

Now, with a mathematical Rule of Three we can calculate the mass of calcium of 0.0750 moles:

So, the mass of 0.0750 moles of calcium is 3.01g.

Answer: F e = 6.31 55.8 = 0.113

Explanation:

Answer: n = 1 can hold a maximum of 2 electrons

n = 2 , maximum 8 electrons

n = 3, maximum 18 electrons

As per the principles of quantum mechanics, the number of electrons that can be added to a given energy level is deduced based on the three quantum numbers: n, l , m(l) and m(s)

'n' is the principal quantum number which defines the energy level. It can take on integer values: 0,1,2,3...

'l' is the angular momentum quantum number which defines the shape of the orbital that an electron occupies

l = 0,1,2...(n-1)

where: l = 0 corresponds to s-orbital

l = 1 corresponds to p-orbital

l = 2, corresponds to d-orbital

'm(l)' is the magnetic moment quantum number which defines the orientation of an orbital  in space.

m(l) = -l, 0, +l

'm(s)' is the spin quantum number which defines the orientation of an electron is an orbital m(s) = +1/2 or -1/2

An s, p or d-orbital can accommodate a maximum of 2, 6 and 10 electrons respectively For energy level with n= 1

l = 0, i.e. s-orbital or 1s.

Therefore, the maximum number of electrons for a 1s orbital would be 2 resulting in an electron configuration of 1s²

For energy level with n= 2

l = 0, 1 i.e. s and p-orbitals

The maximum number of electrons would be

Electron configuration: 2s²2p⁶

For energy level with n= 3

l = 0, 1, 2 i.e. s, p and d-orbitals

The maximum number of electrons would be

Electron configuration: 3s²3p⁶3d¹⁰

Answer:hmm

Explanation:

The equilibrium constant for the system at this temperature is\(1.17 × 10^-31 mol^2/L^2\).

For the chemical equation:

N2(g) + O2(g) ⇌ 2NO(g)

The equilibrium mixture at a temperature of 1500 K is determined to contain 6.4 × 10^-3 mol/L of N2,\(1.7 × 10^-3\)mol/L of O2 and 1.1 × 10^-5 mol/L of NO.  First, we need to calculate the concentration of N2 and O2 required to produce

1.1 × 10^-5 mol/L of NO:

2NO(g) = N2(g) + O2(g)

Given that there are 1.1 × 10^-5 mol/L of NO, the number of moles of N2 and O2 are equal since the stoichiometric ratio is 1:1. Therefore:

\(1.1 × 10^-5 mol/L\) = [N2][O2]Kc = \(([NO]^2)/([N2][O2])Kc\)= \((1.1 × 10^-5 mol/L)^2/(6.4 × 10^-3 mol/L)(1.7 × 10^-3 mol/L)Kc\) =

1.17 × 10^-31 mol^2/L^2.

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Answer: 31.9 g of KOH can be produced from 22.2 g of KOH

Explanation:

To calculate the moles :

\(\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}\)    

\(\text{Moles of} K=\frac{22.2g}{39g/mol}=0.57moles\)  

\(2K+2H_2O\rightarrow 2KOH+H_2\)  

According to stoichiometry :

2 moles of \(K\) produce = 2 moles of \(KOH\)

Thus 0.57 moles of \(K\) will produce=\(\frac{2}{2}\times 0.57=0.57moles\)  of \(KOH\)

Mass of \(KOH=moles\times {\text {Molar mass}}=0.57moles\times 56g/mol=31.9g\)

Thus 31.9 g of KOH can be produced from 22.2 g of KOH