What moles would
I need to dissolve
in 100cm³ to
make 2moldm-³?

It is true that the rate of evaporation is equal to the rate of condensation in a dynamic equilibrium between the liquid state and the gas state.

Since the rate of evaporation is not zero, the vapour pressure increases until the evaporation and condensation rates are equal. The partial pressure of vapour in the container equals the equilibrium vapour pressure of the liquid at this time, indicating that the system is in dynamic equilibrium.

At the liquid water-air interface, the opposing processes of evaporation and condensation take place concurrently. The number of water molecules that transform from liquid to gas each second is the rate of evaporation. The temperature of the liquid water has a major role in determining the rate of evaporation. The rate of evaporation increases with the temperature of the liquid water.

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Explanation:

The statement that accurately describes what happens when ice melts in terms of energy is: "The ice absorbs energy which causes the water molecules to have more kinetic and potential energy, changing their configuration from a solid to a liquid."

When heat energy is added to ice, its temperature increases until it reaches the melting point of 0°C (32°F). At this point, the heat energy is used to break the bonds between the water molecules in the ice crystal structure, allowing the molecules to move more freely. This energy is absorbed by the ice as latent heat of fusion, which increases the kinetic and potential energy of the water molecules and causes the ice to melt and turn into water.

Answer: An element's location in the periodic table is largely dependent on its electrons; the number of valence shell electrons determines its group, and the type of orbital in which the valence electrons lie in determines the element's block.

Explanation: i hoped that helped.

Understanding physical properties of matter is essential in everyday life for a variety of purposes, from cooking to choosing materials.

Knowledge of physical properties of matter is extremely important in everyday life as it helps us understand the nature of substances we come into contact with. One example is the use of boiling points in cooking. Different substances have different boiling points which determine the temperature at which they boil. This information is crucial in determining cooking times and ensuring that food is cooked properly.

For instance, water boils at 100 degrees Celsius, while sugar syrup boils at a much higher temperature. If the wrong temperature is used, food may be undercooked or overcooked, leading to undesired outcomes. Knowledge of physical properties also helps in choosing the right materials for different purposes, such as choosing heat-resistant materials for cooking.

In conclusion, understanding physical properties of matter is essential in everyday life for a variety of purposes, from cooking to choosing materials.

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A Keq value of 29 suggests that the products are strongly favored over the reactants at equilibrium, and the ratio of the concentration of products to the concentration of reactants is 29:1.

The equilibrium constant, Keq, for a chemical reaction is a measure of the relative concentrations of products and reactants at equilibrium. If the value of Keq for a reaction is greater than 1, it indicates that the products are favored at equilibrium, and if Keq is less than 1, it indicates that the reactants are favored. In the case of a Keq of 29, it suggests that the products are significantly favored over the reactants at equilibrium.

More specifically, the Keq value indicates the ratio of the concentration of products to the concentration of reactants at equilibrium. A Keq of 29 indicates that the concentration of products is 29 times greater than the concentration of reactants at equilibrium. This suggests that the reaction strongly favors the formation of products, and the equilibrium is shifted towards the products side.

It is important to note that the value of Keq is temperature-dependent and can change with changes in temperature. A decrease in temperature can cause the equilibrium to shift towards the reactants, while an increase in temperature can shift it towards the products. However, at any given temperature, a Keq value greater than 1 indicates that the reaction is proceeding towards the products side, and a Keq value less than 1 indicates that it is proceeding towards the reactants side.

In summary, a Keq value of 29 suggests that the products are strongly favored over the reactants at equilibrium, and the ratio of the concentration of products to the concentration of reactants is 29:1.

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The work done during this reaction is -0.1013 kJ. Therefore, the correct option is 2) -7.3 kJ.

According to the question, the work done during a reaction in which the internal volume expands from 0.75 L to 1.25 L against an external pressure of 2 atm has been asked to calculate. The formula for work done by a system can be given as: Work = -PΔV Where P is the external pressure and ΔV is the change in volume of the system. The pressure is given as 2 atm, the change in volume can be calculated as:

ΔV = Vf - ViΔV

= 1.25 L - 0.75 L

= 0.5 L

Now, putting the given values into the formula of work, we get:Work = -PΔVWork = -(2 atm)(0.5 L)Work = -1 atm L The units of atm L are not in standard units of Joules, but we can convert them using the conversion factor 1 atm L = 101.3 J Therefore, Work = -1 atm L × 101.3 J/atm L Work = -101.3 J = -0.1013 kJ.

Thus, the work done during this reaction is -0.1013 kJ. Therefore, the correct option is 2) -7.3 kJ.

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Answer:

A D E hope it helps. have a great day

Answer:

0.24 g/ml

Explanation:

By definition, density is defined as mass/unit volume (e.g., g/ml or g/cm^3, kg/m^3, oz/in^3 = etc.).

65 g

25.0 ml

(6.0 grams)/(25.0 ml) = 0.24 g/ml (to 2 sig figs)

Answer:

(102 900 ÷ 12) + (170 × 1.27) = 8800

Step 1. Evaluate the expressions inside the parentheses (PEMDAS)

102 900 ÷ 12 = 8575

170 × 1.27 = 215.9

In multiplication and division problems, your answer can have no more significant figures than the number with the fewest significant figures.

Thus, the underlined digits are not significant, but we keep them in our calculator to avoid roundoff error.

Step 2. Do the addition (PEMDAS).

  8575

+    215.9

= 8790.9

Everything that you add to an insignificant digit gives an insignificant digit as an answer.

Thus, the underlined digits are not significant.

We must drop them and round up the answer to 8800.

Explanation:

The correct answer is C. A television

Explanation:

Plasma is a particular state of matter that differs from liquid, solid, and gas because plasma is a gas but contains mainly particles that have lost their electrons or ions. This makes plasma have properties other states do not have. Additionally, plasma is now widely used in technologies, including televisions, this is because plasma is used in thousands of small containers to create the images in a Tv. This leads to high quality and precise images. Therefore, the commercial technology that commonly uses plasmas is a television.  

Answer:

c

Explanation:

edge

Answer:

D

Explanation:

there are 5 electrons in the outer shell of the first picture

According to electronic configuration, model 1 shows 5 electrons in the outer shell of the atom.

Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.

Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.

Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.

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Answer:

Explanation:

When Iron is dipped in Aluminium Chloride, a redox reaction occurs. Basically iron reacts with Chloride ion and forms a solid precipitate of Aluminium.

End result :Iron (II) Chloride forms and Aluminium forms the precipitate

Hydrogen and oxygen are elements and make up the chemical molecule water. Reverse chemistry, in general, decomposes substances into their constituent parts. As an illustration, the process of electrolysis allows the complex water to be broken down into the components hydrogen and oxygen.

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The equation that represents a single replacement reaction given the various options is 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) (option 2)

A single replacement reaction, also known as single displacement reaction is a reaction in which elements higher in the electro-chemical series displace or replace elements lower in the electro-chemical series displace from a solution.

The following example illustrates single replacement reaction:

A + BC -> AC + B

From the above reaction, we can see that A has replace/displace B to from AC.

With the above information, we can determine the equation that represents single replacement reaction. Details below:

Equation from the questions:

From the above, we can see that only 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) conform to single replacement reaction.

Thus, the correct answer to the question is: 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) (option 2)

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Answer:

It is a force acting on the object.

Explanation:

The answer option which is true about the weight of an object is: C. It is a force acting on the object.

Weight can be defined as the force acting on a physical body or an object as a result of gravity. Also, the weight of an object is measured in Newton.

Mathematically, the weight of an object is given by the formula;

Where;

m is the mass of the object.

g is the acceleration due to gravity.

In conclusion, the weight of an object is the force acting on an object due to gravity.

Answer:

Boron : B :: Beryllium :​Be

Explanation:

Boron is an element found in group 13 of the periodic table. It has three electrons in its outermost shell hence a valency of 3.

Beryllium is an element in group two of the periodic table. It has a valency of two hence there are two electrons in its outermost shell.

Boron and beryllium are similar words. The symbol of boron is B while the symbol of beryllium is Be.

The volume of carbon dioxide gas produced at STP during the reaction is equal to 56 L.

Combustion reactions involve the complete oxidation of the fuel a hydrocarbon such reactions commonly liberate only carbon dioxide and water as products.

A hydrocarbon undergoes combustion to yield carbon dioxide and small amounts of water as the product. It can also be noted that no side products are left behind in the combustion reaction.

The given balanced combustion reaction of alcohol:

C₂H₅OH (l)  +  3O₂  (g) →  2CO₂  (g)  +  3 H₂O  (g)

One mole of the ethanol produced carbon dioxide = 2 mol

Then 1.25 mol of the alcohol produced carbon dioxide = 2.5 mol

The volume occupied by one mole of carbon dioxide = 22.4 L

The volume of  2.5 mol of CO₂ = 22.4 × 2 = 56 L

Therefore, the volume of CO₂ gas produced during the reaction is 56 L.

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Answer: 56L

Explanation: The volume of carbon dioxide gas produced at STP during the reaction is equal to 56 L.

Answer:

SrCl2

Explanation:

Answer:

It is unsaturated

Explanation:

A solution is said to be unsaturated when it contains less solute than it can normally hold at a given temperature.

The solubility of NaCl remains fairly independent of temperature hence the line for the solubility of NaCl remains fairly flat in the solubility curve.

The solubility of NaCl is about 36 g of NaCl in 100g of water. Hence a solution that contains 35.00 g of sodium chloride in 100 g of water at 45.0C is unsaturated.

The value of Ea′ is -53 kJ/mol, and it represents the energy released during the chemical reaction.

The given values ∆E = −33 kJ/mol and Ea = 20 kJ/mol represent the activation energy and the change in energy, respectively, for a chemical reaction. The activation energy, Ea, is the minimum energy required for the reaction to occur, while the change in energy, ∆E, represents the difference between the energy of the reactants and the energy of the products.

The relationship between the activation energy, Ea, and the change in energy, ∆E, can be expressed using the equation: ∆E = Ea + Ea′ where Ea′ represents the energy released during the reaction. Since the change in energy and the activation energy are given, we can rearrange the equation to solve for Ea′: Ea′ = ∆E - Ea

Substituting the given values, we get: Ea′ = −33 kJ/mol - 20 kJ/mol = -53 kJ/mol. Therefore, the value of Ea′ is -53 kJ/mol. This negative value indicates that the reaction is exothermic, meaning that it releases energy as it proceeds. The magnitude of the value (-53 kJ/mol) indicates that the energy released during the reaction is significant.

In summary, the value of Ea′ is -53 kJ/mol, and it represents the energy released during the chemical reaction. This value can be calculated using the equation Ea′ = ∆E - Ea, where ∆E is the change in energy and Ea is the activation energy.

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Answer:

24 atoms

3C8

3*8=24

28 atoms of carbons are there in 3 molecules of octane.

A chemical element is uniquely defined by its atoms, which are tiny pieces of substance. A core nucleus surrounded by one or more negatively charged electrons makes up an atom.

Octane has an eight carbon atom straight chain alkane.

so, the three molecules of octane will have = 3 * 8 = 24 atoms.

Thus , 28 atoms of carbons are there in 3 molecules of octane.

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Answer:

The formula NH4OH is ammonium hydroxide. ... The pH of NH4OH is 11.6, so it is a base.

Explanation:

Answer:

The base chemical in the manufacture of nitric acid

Explanation:

The adiabatically compressed system has the higher temperature at the end of the compression.

This is because, according to the ideal gas law, pressure and temperature are related by the equation:

PV^γ = constant

Where γ is the ratio of specific heat for the gas. Since the compression is adiabatic, no heat is added to the system and thus γ = 1.4 for most gases. Therefore, the pressure and temperature are related by:

\(\frac{P1}{T1} = \frac{P2}{T2}\)

Since P1 and P2 are equal (10 bar) but T2 is greater than T1, it follows that T2 must be greater than T1. Therefore, the adiabatically compressed system has a higher temperature than the isothermally compressed system.

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The caloric value in kcal/g of the potato chips would be 0.45 kcal/g.

We can use the formula:

q = m × c × ΔT

where q is the heat transferred, m is the mass of the water, c is the specific heat of water, and ΔT is the change in temperature of the water.

First, we calculate the heat transferred from the burning of the potato chips:

q = m × ΔH

where m is the mass of the potato chips and ΔH is the heat of combustion per unit mass of the potato chips.

We can find ΔH by dividing the heat transferred to the water by the mass of the potato chips burned:

ΔH = q / m

Now, we substitute the given values into the formula for q:

q = m × c × ΔT

q = 27.1 g × 4.184 J/(g·°C) × (21.9 °C - 16.9 °C)

q = 1134.7 J

Next, we convert the mass of the potato chips from grams to kilograms:

m = 2.5 g / 1000 g/kg = 0.0025 kg

Finally, we calculate the caloric value of the potato chips by using the formula:

ΔH = q / m

ΔH = 1134.7 J / 0.0025 kg = 453880 J/kg

To convert this to kcal/g, we divide by 1000 to get:

ΔH = 453.88 kcal/kg / 1000 g/kg = 0.45388 kcal/g

Therefore, the caloric value of the potato chips is approximately 0.45 kcal/g.

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Answer:

Mechanical energy

Explanation:

Given that,

Potential energy of an object is given by :

P = mgh

The kinetic energy of an object is given by :

\(K=\dfrac{1}{2}mv^2\)

Where

m is mass

h is height

v is velocity of the object

The sum of potential and kinetic energy is equal to total energy or the mechanical energy.

Hence, if air resistance is negligible, the sum total of potential and kinetic energies of a freely falling body is equal to mechanical energy.

Answer:

44.8 L

Explanation:

1 mole of a gas at s.t.p. occupies a volume of 22.4 L.

Molar mass of Neon is 20.1 g/mol

Number of moles of neon present in 40.2 g = Mass/molar mass

Number of moles = 40.2 / 20.1 = 2 moles.

Therefore, 2 moles of neon gas will occupy 2 * 22.4 L = 44.8 L

44.8 L

Molar mass of Neon is 20.1 g/mol

Number of moles of neon present in 40.2 g =\(Mass/molar mass\)

\(Number of moles = 40.2 / 20.1 \\= 2 moles.\)

At STP:-

Gases have a volume of 22.4L/mol.

Therefore, 2 moles of neon gas will occupy the volume is as follows:-

\(2 mol\times22.4 L/mol = 44.8 L\)

So, the volume is 44.8 L.

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Answer:

A

nitrogen (N), antimony (Sb), bismuth (Bi)

Explanation:

Answer:

A. nitrogen (N), antimony (Sb), bismuth (Bi)

Explanation:

Answer:

exothermic reaction

Explanation:

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