The diagram shows the transfer of heat by -

Answer:

The goal of science is to learn how nature works by observing the natural and physical world, and to understand this world through research and experimentation.

Explanation:

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

Avogadro’s wide variety, the wide variety of gadgets in a single mole of any substance (described as its molecular weight in grams), is the same as 6.02214076 × 1023. The gadgets can be electrons, atoms, ions, or molecules, relying on the character of the substance and the individual of the reaction (if any).

Avogadro's Law

Avogadro's law states that an "equal volume of all gases at the same temperature and pressure contain the same number of molecules"

For example:-

18g of water = 1 mole = 6.022* 10²³ molecules of water

1.008g of hydrogen = 1 mole = 6.022 *10²³ atoms of hydrogen

96.06g of SO₄²- ion = 6.022*10²³ ions of SO₄²-.

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Answer:

It will sink.

Explanation:

Density of water=1gm/cc (In CGS)

Volume of cube=l^3 =3^3= 27cc

Mass of cube =54gm

Density of cube=M/V =54/27 =2gm/cc

Here, density of cube is greater than that of water. So, the cube sinks.

The amount of heat absorbed to raise the temperature of 435 grams of water at 1 atm from 25°C to its boiling point, 100°C, is approximately 1.4 × 10^5 joules

What is specific heat?

Specific heat is the amount of heat energy required to raise the temperature of a substance by one unit of temperature per unit of mass. It is a physical property that helps to characterize a substance and is typically measured in units of joules per gram per degree Celsius (J/g°C) or calories per gram per degree Celsius (cal/g°C).

The amount of heat absorbed to raise the temperature of a substance can be calculated using the formula:

Q = mcΔT

where Q is the amount of heat absorbed (in joules), m is the mass of the substance (in kilograms), c is the specific heat capacity of the substance (in joules per kilogram per degree Celsius), and ΔT is the change in temperature (in degrees Celsius).

Substituting the given values, we get:

m = 435 grams = 0.435 kg

ΔT = 100°C - 25°C = 75°C

The specific heat capacity of water is 4.184 J/g°C. We can convert this to joules per kilogram per degree Celsius (J/kg°C) by dividing by 1000:

c = 4.184 J/g°C ÷ 1000 = 4.184 J/kg°C

Substituting these values, we get:

Q = (0.435 kg) × (4.184 J/kg°C) × (75°C)

Q = 140,089.2 J

Therefore, the amount of heat absorbed to raise the temperature of 435 grams of water at 1 atm from 25°C to its boiling point, 100°C, is approximately 1.4 × 10^5 joules. The answer closest to this value is option (B).

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Active metals, such as calcium oxide (CaO), react with water to form an oxide-water reaction.

This reaction produces an alkaline solution, which has a pH higher than 7. As a result, the water will become less acidic, and the oxide will be converted into its hydrated form.

This reaction is an important part of the water treatment process, since it helps to reduce the acidity of water and make it safer for drinking.

Additionally, the alkaline solution produced by the reaction can be used to neutralize acidic materials, making it useful for a variety of industrial and environmental applications.

Active metals such as calcium oxide (CaO) are capable of reacting with water to form oxides.

The reaction between the oxides and water can be used in a variety of different applications, such as to create materials with high strength and durability, or to generate power through the combustion of the oxides.

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sink: w cube+w sand>Fb(buoyant force)

w cube = massless = 0

w sand>Fb

w sand > 1000 x 10 x (11/100)³

w sand > 13.31 N

ρgV sand > 13.31

3.5 x 10³ x 10 x V sand > 13.31

V sand = 13.31 : 3.5 x 10⁴ = 3.803 x 10⁻⁴ m³ = 380.3 cm³  

The pH of the 4.06 mg/L Ba(OH)₂ solution is approximately 12.68.

To calculate the pH of a barium hydroxide (Ba(OH)₂) solution, we need to consider the hydrolysis of the compound. However, Ba(OH)₂ is a strong base and will dissociate completely in water. Therefore, we do not need to consider the hydrolysis reaction.

Barium hydroxide dissociates into barium ions (Ba²⁺) and hydroxide ions (OH⁻) in a 1:2 molar ratio.

Given the concentration of the Ba(OH)₂ solution as 4.06 mg/L, we need to convert this to molarity (mol/L) before proceeding with the pH calculation.

First, let's calculate the molar mass of Ba(OH)₂:

Ba = 137.33 g/mol

O = 16.00 g/mol

H = 1.01 g/mol

Molar mass of Ba(OH)₂ = (137.33 g/mol) + 2[(1.01 g/mol) + (16.00 g/mol)] = 171.34 g/mol

Next, let's convert the concentration from mg/L to mol/L:

Concentration (mol/L) = (4.06 mg/L) / (171.34 g/mol) = 0.0237 mol/L

Since Ba(OH)₂ dissociates into two hydroxide ions (OH-) per formula unit, the concentration of hydroxide ions in the solution is twice the concentration of Ba(OH)₂:

Concentration of OH- (mol/L) = 2 * 0.0237 mol/L = 0.0474 mol/L

To calculate the pOH, we take the negative logarithm (base 10) of the hydroxide ion concentration:

pOH = -log10(0.0474) ≈ 1.32

Finally, we can determine the pH using the equation:

pH = 14 - pOH

pH = 14 - 1.32 ≈ 12.68

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Atoms of nonmetallic elements form covalent bonds, but they can also form ionic bonds. An ionic bond results when a nonmetallic elements gains electrons to form an ion.

Hydrogen, carbon, nitrogen, oxygen, phosphorus, sulphur, silicon, boron, tellurium, and selenium are among the non-metallic elements in the periodic table. They also consist of noble gases and halogens (such as fluorine, chlorine, bromine, iodine, and astatine) (helium, neon, argon, krypton, xenon and radon).

Nonmetals are a group of seventeen elements, the majority of which are gases (hydrogen, helium, nitrogen, oxygen, fluorine, neon, chlorine, argon, krypton, xenon, and radon), one of which is a liquid (bromine), and a few of which are solids.

Hydrogen, carbon, nitrogen, oxygen, phosphorus, sulphur, silicon, boron, tellurium, and selenium are among the non-metallic elements in the periodic table. They also consist of noble gases and halogens (such as fluorine, chlorine, bromine, iodine, and astatine) (helium, neon, argon, krypton, xenon and radon).

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Answer:

can you show us question 3 pls

Explanation:

The balanced reaction of this chemical reaction is as follows :

• As we can see, this is a double-displament reaction

The exact value of the per cent ionization of the acid HA is approximately 1.8.

To find the per cent ionization of the acid HA, we can use the equilibrium pH and the initial concentration of the acid. The pH is a measure of the concentration of hydrogen ions in a solution.

Given that the pH at equilibrium is 0.76, we can convert it to [\(H^+\)] concentration by taking the antilog. Thus, \([H^+] = 10^{(-0.76)}\).

At equilibrium, the concentration of the ionized form of the acid (\(A^-\)) is equal to the concentration of hydrogen ions. Therefore, [\(A^-\)] = [\(H^+\)].

To calculate the per cent ionization, we use the formula: Percent Ionization = ([\(A^-\)] / Initial concentration of HA) * 100.

Substituting the values, we have Percent Ionization = ([\(H^+\)] / 0.39) * 100.

Since \([H^+] = 10^{(-0.76)}\), we can calculate the per cent ionization using this value.

Percent Ionization = \((10^{(-0.76)} / 0.39) * 100.\)

To find the percent ionization of the acid HA, we can use the equilibrium pH and the initial concentration of the acid. The pH is a measure of the concentration of hydrogen ions in a solution.

Given that the pH at equilibrium is 0.76, we can convert it to [\(H^+\)] concentration by taking the antilog. Thus, \([H^+] = 10^{(-0.76)}\).

At equilibrium, the concentration of the ionized form of the acid (A-) is equal to the concentration of hydrogen ions. Therefore, [A-] = [\(H^+\)].

To calculate the percent ionization, we use the formula: Percent Ionization = ([A-] / Initial concentration of HA) * 100.

Substituting the values, we have Percent Ionization = ([\(H^+\)] / 0.39) * 100.

Since \([H^+] = 10^{(-0.76)}\)we can calculate the percent ionization using this value.

Percent Ionization = \((10^{(-0.76)} / 0.39) * 100.\)

To calculate the exact value of per cent ionization, we need to perform the calculations using the given values.

Given:

The initial concentration of HA = 0.39 M

pH at equilibrium = 0.76

To determine the concentration of hydrogen ions [\(H^+\)], we can convert the pH value to a decimal form:

\([H^+] = 10^{(-pH)} = 10^{(-0.76)}\)

Substituting this value into the per cent ionization formula:

Per cent Ionization = ([\(H^+\)] / Initial concentration of HA) * 100

                 = \((10^{(-0.76)} / 0.39) * 100\)

Evaluating this expression, we find the exact value of per cent ionization.

Percent Ionization = \((10^{(-0.76)} / 0.39) * 100 \approx 1.804\)

Therefore, the exact value of the per cent ionization of the acid HA is approximately 1.8.

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Propanal and acetone are the IUPAC names for the chemical.

Propanal, commonly known as propanaldehyde, is an aldehyde with one double bond and one oxygen atom.

Acetone is a ketone compound. R2CO is the functional group of ketones.

Thus, Propanal and acetone are the IUPAC names for the chemical.

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Answer:

SnO2

Explanation:

The limiting reactant is the reactant that runs out first during a chemical reaction.

Reactants are on the left side of the reaction, so SnO2 and H2. They tell us in the question that there is "excess" hydrogen (H2), so we know there is plenty of it, as "excess" means "more than enough." If we have more than enough hydrogen, then we know that we will run out of SnO2 first.

:)

Answer:SnO2

Explanation:

Answer:

Tug of War

An object sinking in water

Kicking a ball

Answer:

turning a cartwheel.

riding a skateboard.

a football sailing toward the goalpost after it is kicked

The efficiency of the engine is 91%.

The efficiency of the engine signifies how much heat is used and converted successfully into usable heat. It is fact that no engine can be 100% efficient because heat loss takes place in different ways during the process.

The efficiency of the engine is calculated by the formula:

Efficiency = Output heat/Input heat x 100

The temperature of heat engine is 1800 K. The temperature of the surrounding is 160 K.

Substitute the values in the above formula.

Efficiency = (1800 - 160)/1800 x 100

= 91%

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Answer:

91%

Explanation:

got it right on edge 23

Answer:

When you are in the laboratory and take a direct sniff the chemicals you are using, you run the risk of damaging your mucous membranes or your lungs. When its necessary to smell chemicals in the lab, the proper technique is to cup your hand above the container and waft the air towards your face.

Gas is a naturally odourless substance, but the completely harmless artificial smell is added to make it more detectable. The substance is called mercaptan and gives off a strong sulphur like smell.

Answer:

keep it from being washed away by water

Answer:

Explanation:

Since the temperature of the gas is constant , we use Boyle's law formula

P₁ V₁ = P₂ V₂

P₁ = 2.5  x 10⁵ Pa

V₁ = 250 x 10⁻⁶ m³

V₂ = 3.5 x 10⁻³m³

P₂ = ?

Putting the values in the equation

2.5  x 10⁵ x 250 x 10⁻⁶ = 3.5 x 10⁻³ P₂

P₂ = 2.5  x 25 / 3.5 x 10⁻³

= 17.86 x 10³ Pa

= .1786 x 10⁵ Pa

= .1786 x 10⁵ / 1.013 x 10⁵ atm

= .176 atm

Answer: I remember looking out of the car as we pulled up to the Frantz school.”

“I thought maybe it was Mardi Gras.”

“As we walked through the crowd, I didn’t see any faces.”

“[The school] looked bigger and nicer than my old school.”

“The crowd behind us made me think this was an important place.”

“It must be college, I thought to myself.

Explanation:

“I thought maybe it was Mardi Gras.”

“[The school] looked bigger and nicer than my old school.”

“It must be college, I thought to myself.”

Answer:

The inner planets are also called terrestrial planets.

Explanation:

Answer:

D.

Explanation:

The reaction is losing potential energy, which means that the reaction is losing that energy as heat. Exothermic is the loss of energy. Therefore it will be D.

(A) Mass of oxygen produced from the decomposition of 2.71 grams of sodium oxide is

(B) Mass of sodium produced from the decomposition of 2.82 grams of sodium oxide is

(C) Mass of sodium oxide are need to produce 2.57 grams of sodium

2Na₂O --> 4Na + O₂

124 g/mol 92 g/mol 32 g/mol

2 mol 4 mol 1 mol

mass of oxygen produced

3.44 g of sodium oxide is required to produce 2.57 g of sodium and 2.84 g of Sodium oxide produce 2.1 g of Sodium.

2Na₂O ----- 4Na + O₂

As we have noticed from the chemical equation that, 2 moles of sodium oxide react to give 4 moles of sodium and 1 mole of oxygen molecule.

As,

2 moles of Sodium oxide = 4 moles of sodium

1 moles of Sodium oxide = 2 moles of sodium

As we know that,

Molar mass of sodium oxide = 62 g

Molar mass of sodium = 23 g

In terms of mass,

62g of Sodium oxide produce = 46 g of Sodium

1 g of Sodium oxide produce = 46/62 g of Sodium

2.84 g of Sodium oxide produce = (46/62) × 2.84g of Sodium

2.84 g of Sodium oxide produce = 2.1 g of Sodium

or

1.34g of sodium oxide produce 1 gram of sodium

1.34 × 2.57 g of sodium oxide produce 2.57 g of sodium.

3.44 g of sodium oxide produce 2.57 g of sodium.

Thus, we concluded that the 3.44 g of sodium oxide is required to produce 2.57 g of sodium and 2.84 g of Sodium oxide produce 2.1 g of Sodium

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Answer:

d

Explanation:

Answer:

D

Explanation:

Because it is l o l

Number the following structures:

The respiratory tract is the pathway through which air and gases enter and leave the body. The respiratory tract is divided into two main parts: the conducting zone and the respiratory zone.

The conducting zone includes structures that are involved in the movement of air into the body, such as the nose, pharynx, larynx, trachea, and bronchi. These structures are involved in filtering, warming, and moistening the air before it enters the body.

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Urea will not diffuse through the 20 MWCO membrane because they are big in size than the pores of the membrane.

Diffusion can be described as the net movement of anything generally from a region of higher concentration to an area of lower concentration. Diffusion can be driven by a gradient in chemical potential or Gibbs free energy.

A gradient can be described as a change in the value of a quantity, for example, concentration, temperature, or pressure with a change in another variable, distance.

Dialysis also works on the principles of the diffusion of solutes across a semi-permeable membrane. Diffusion can be defined as a property of substances in water where substances tend to move from an area of high concentration to a low concentration.

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Answer:

It should be heated

Explanation:

To change the solid nugget of silver to liquid so that it can be shaped, the solid mass should be heated to the melting point.

Therefore a phase change from solid to liquid is attained by heating of the solid to melting point.

The main reservoirs of the carbon cycle are the atmosphere, oceans, land (including vegetation and soils), and fossil fuels. In these reservoirs, carbon exists in both inorganic and organic forms.

The inorganic carbon cycle involves the exchange of carbon dioxide (CO2) between the atmosphere and oceans through processes like photosynthesis and respiration.

Organic carbon, on the other hand, is found in living organisms, dead organic matter, and soil organic matter. It is cycled through processes such as decomposition and consumption by organisms. The interactions between the inorganic and organic carbon cycles occur primarily in the biosphere, where photosynthesis converts inorganic carbon into organic carbon compounds. While inorganic carbon is primarily in the form of CO2, organic carbon is present in complex organic molecules. Both forms of carbon play crucial roles in energy transfer, nutrient cycling, and climate regulation.

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