b) barium hydroxide + sulphuric acid
5. When added to a solution of hydrochloric acid, a lump of calcium metal reacts until it completely
dissolves. However, when added to a solution of sulphuric acid, there is an initial vigorous reaction which
then rapidly comes to a halt so that not all the calcium dissolves. Explain the difference in the reactivity of
calcium with these acids.

Answer:

True,When fluorine gas is put into contact with calcium metal at high temperatures, calcium fluoride powder is created in an exothermic reaction.

Answer:

2802.5 KJ/mol

Explanation:

Calculate standard enthalpy of the Reaction :

6CO2(g) + 6H2O(l)C6H12O6 + 6O2(g)

using standard formation enthalpies . hence the standard enthalpy of the reaction = 2802.5 KJ/mol

attached below is the detailed solution

The gravity force on an object from the Earth is the same regardless of whether the object is surrounded by air .

the Earth has an average gravitational force. Different locations on Earth have gravitational forces that are larger or smaller than average. This is because each location has more or less mass than the average

The mode of the laser cavity is approximately 108.70.

To determine the mode of a laser cavity, we can use the formula:

Mode = L / (2 × d)

Where:

L is the length of the cavity

d is the wavelength of the emitted light

Given:

Length of the cavity (L) = 15 cm

Length of the cavity (L)  = 0.15 m

Wavelength (d) = 693 nm

Wavelength (d) = 693 × 10⁻⁹ m

Plugging the values into the formula:

Mode = 0.15 m / (2 × 693 × 10⁻⁹ m)

Mode = 108.70

The mode of the laser cavity is approximately 108.70.

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Answer:

true

Explanation:

because Lewis represent valid resonance

The given Lewis structure does not show valid resonance form. So,the given statement is false.

The Lewis structure is the representation of the of valence shell in the molecule.

The electron present in outermost shell and which involve in chemical bond formation is called valence electron.

Resonance is way to explain the localisation of electron in molecule where Lewis formula fails to describe.

The given statement is false because both structure shows different number of valence electron.

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The energy needed to remove an electron from an atom is called the ionization energy.

Ionization energy refers to the amount of energy required to overcome the electrostatic attraction between the positively charged nucleus and the negatively charged electron, resulting in the removal of the electron from the atom.

When an electron is tightly bound to an atom, it requires a certain level of energy to break free from its orbit and become a free electron. This energy is specific to each atom and is influenced by factors such as the atomic number, electron configuration, and shielding effect of inner electrons. The ionization energy is commonly measured in units of electron volts (eV) or kilojoules per mole (kJ/mol).

Ionization energy plays a crucial role in various fields of science, including chemistry, physics, and materials science. It is particularly important in understanding chemical bonding, reactivity, and the behavior of atoms and ions. Elements with low ionization energies tend to readily lose electrons and form positive ions, while elements with high ionization energies are more likely to gain electrons and form negative ions.

Ionization energy is the energy required to remove an electron from an atom, and it has significant implications for the understanding of atomic structure, chemical reactions, and the properties of elements.

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Answer: 1265.6037

Explanation:

The combination of beads should the student use for  the model :2 green, 3 blue and 12 yellow

In the chemical formula of a compound there are numbers:

1. The number indicates the number of atoms written after the element symbol

2. The number after the parentheses represents the number multiplied by the number of atoms in parentheses.

3. The number before the chemical formula shows the number of molecules behind it, which is usually used in equations

To calculate the beads needed to make a model, we must count the number of atoms of the Al₂(SO₄)₃ molecule

In the Al₂ (SO₄) ₃ molecule there are 3 atoms : Al, S, and O

So the combination of beads

2 green(for Al), 3 blue(for S) and 12 yellow(for O)

Answer:

2 blue, 3 yellow, and 12 green

Explanation:

Answer:

lol im sorry man

Explanation:

Answer:

My old acc got banned

Explanation:

The given statements concern the relationship between mitochondrial hydrogen ion concentration and energy storage as ATP during oxidative phosphorylation. Accurate statements are 1 and 2 and Inaccurate statements are 3 and 4.

Accurate statements:
1. Energy is generated as a result of the difference in hydrogen ion concentration between the mitochondrial matrix and the cytoplasm.
2. H+ ions move through a channel formed by ATP synthase, releasing energy to form ATP.

Inaccurate statements:
1. ATP synthase uses energy from ATP to move H+ into the mitochondrial matrix.
2. The pH in the mitochondrial matrix is lower than the pH in the intermembrane space.

During oxidative phosphorylation, a proton gradient is established across the inner mitochondrial membrane. This is achieved by the electron transport chain (ETC), which pumps protons (H+) from the mitochondrial matrix into the intermembrane space. This creates a higher hydrogen ion concentration in the intermembrane space, making its pH lower compared to the mitochondrial matrix. The resulting electrochemical gradient provides the energy needed to produce ATP.

ATP synthase, an enzyme embedded in the inner mitochondrial membrane, utilizes this energy by allowing H+ ions to flow back into the mitochondrial matrix. The flow of protons through the ATP synthase channel releases energy, which the enzyme then uses to convert ADP (adenosine diphosphate) and inorganic phosphate (Pi) into ATP (adenosine triphosphate), the cell's primary energy currency.

Thus, the statements that accurately describe the process are those related to the generation of energy due to the difference in hydrogen ion concentration and the role of ATP synthase in using that energy to form ATP. The inaccurate statements either incorrectly describe the process (using ATP to move H+ into the matrix) or misstate the pH conditions within the mitochondria.

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Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

\(n = \frac{N}{L} \\\)

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

\(n = \frac{6.4 \times {10}^{22} }{6.02 \times {10}^{23} } \\ = 0.10631229...\)

We have the final answer as

Hope this helps you

Answer: 6.45 Joules

Explanation: I just did it

The total charge that flows while the battery is being charged is approximately 193,939.39 Coulombs.

To calculate the total charge that flows while the battery is being charged, we can use the relationship between electrical energy, potential difference, and charge.

The electrical energy (E) stored in the battery is given as 64 mega Jules (64 MJ). The potential difference (V) provided by the battery is 330 volts. We know that the energy (E) is equal to the product of the potential difference (V) and the charge (Q):

E = V * Q

Since the charging process is 100% efficient, all the electrical energy supplied is stored in the battery. Therefore, we can rearrange the equation to solve for the charge (Q):

Q = E / V

Substituting the given values, we have:

Q = 64 MJ / 330 V

To perform the calculation, we need to convert mega Jules (MJ) to joules (J) since the SI unit of energy is joules. One mega Joule is equal to 1 million joules:

Q = (64 * 10^6 J) / 330 V

Calculating the division:

Q ≈ 193,939.39 Coulombs

Therefore, the total charge that flows while the battery is being charged is approximately 193,939.39 Coulombs.

This value represents the quantity of electric charge transferred during the charging process, and it indicates the amount of electricity that enters the battery.

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Mendeleev was having trouble finding a textbook that would work for him as he started teaching inorganic chemistry.

He set out to develop another organic chemistry textbook because he had already written one in 1861 that had won the coveted Demidov Prize. The outcome was Osnovy khimii (1868–1871), or The Principles of Chemistry, which went on to become a classic and was published in numerous editions and translations. Mendeleev compared the properties of this group of elements to those of the group of alkali metals, such as sodium, when he started to write the chapter on the halogen elements (chlorine and its analogs) at the conclusion of the first volume.

He saw similarities in the evolution of atomic weights between these two groupings of distinct elements and pondered whether other groups of elements shared same characteristics. Mendeleev discovered after examining the alkaline earths that the order of atomic weights could be used to arrange not only the elements within each group, but also the groups themselves. Mendeleev found the periodic rule as a result of his efforts to make sense of the wealth of information on the chemical and physical characteristics of the chemical elements and their compounds that already existed.

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Answer:

30796.5J

Explanation:

Answer:

the emission of visible light by a body, caused by its high temperature.Compare luminescence.

the light produced by such an emission.

the quality of being incandescent.

Given data:H2O vapor content: 13 gramsH2O vapor capacity: 52 grams at 25 degrees Celsius 13 grams at 10∘C52 grams at 30∘CFormula used to find the dew point:$$\dfrac{13}{52}=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$$$\frac{1}{4}=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$

Where A is the constantDew Point:It is the temperature at which air becomes saturated with water vapor when the temperature drops to a point where dew, frost or ice forms. To solve this question, substitute the given data into the formula.$$13/52=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$$$13(17.27-A)=3\pi A(ln100)$$By simplifying the above expression, we get$$A^2-17.27A+64.78=0$$Using the quadratic formula, we get$$A=9.9,7.4$$

The dew point is 7.4 since it is less than 10°C.More than 100:The term "More than 100" has not been used in the question provided.

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Answer:

The reactants in this chemical reaction are copper and oxygen, and the indicators of the chemical reaction include a change in color, release of energy in the form of heat, consumption of gas (oxygen), and a change in physical properties.

Explanation:

The reactants in this chemical reaction are copper and oxygen. When copper reacts with oxygen in the air, it forms a new green substance called copper oxide (CuO).

There are several indicators of a chemical reaction that can be observed during this process. The first indicator is a change in color. In this case, the copper metal changes from its original reddish-brown color to a greenish-blue color as it reacts with oxygen to form copper oxide. This change in color is due to the formation of a new substance with different properties than the original reactants.

Another indicator of a chemical reaction is the release or absorption of energy in the form of heat, light, or sound. In this case, the reaction between copper and oxygen is exothermic, meaning that it releases heat energy. This can be observed by feeling the warmth produced by the reaction.

A third indicator of a chemical reaction is the formation of a precipitate or gas. In this case, no precipitate is formed, but a gas (oxygen) is consumed during the reaction.

Finally, a chemical reaction often involves a change in physical properties such as density, melting point, or boiling point. In this case, copper oxide has different physical properties than copper metal, such as being less dense and having a higher melting point.

In summary, the reactants in this chemical reaction are copper and oxygen, and the indicators of the chemical reaction include a change in color, release of energy in the form of heat, consumption of gas (oxygen), and a change in physical properties.

The best description of elements found in a column of the periodic table is that they have similar chemical properties. The elements in a column or group of the periodic table share the same number of valence electrons, which are responsible for the chemical behavior of the element.

This similarity in electron configuration leads to similar chemical properties, such as reactivity, electronegativity, and ionization energy. However, the elements in a column do not necessarily have the same atomic number or the same size atoms. In fact, the atomic size tends to increase as you go down a column due to the addition of more electron shells. Therefore, it is the similar electron configuration and resulting chemical behavior that define the elements in a column of the periodic table.

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Answer:

you need to put a choice if you want help add the possible answers

Explanation:

The concentration of perchlorate ion in a perchloric acid solution with a pH of 3.158 can be calculated using the Henderson-Hasselbalch equation.Therefore, the concentration of perchlorate ion in the solution is 4.7 x 10^{-4} M.

Perchloric acid (HClO4) is a strong acid. A strong acid is a substance that almost entirely dissociates into ions when it dissolves in water. As a result, perchloric acid can be thought of as a source of hydrogen ions (H+) in solution.The concentration of hydrogen ions in solution can be determined using the pH of the solution. pH is the negative logarithm of the hydrogen ion concentration in moles per liter (mol/L) of solution.A pH of 3.158 corresponds to a hydrogen ion concentration of:10^{-3.158} = 6.59 x 10^{-4}  mol/LIn a perchloric acid solution, the perchlorate ion (ClO4) is the conjugate base of the acid. It can be concluded that the concentration of perchlorate ions (ClO4-) is equal to the concentration of hydrogen ions (H+) in the solution because the acid completely dissociates. Therefore, the concentration of perchlorate ions in a solution with a pH of 3.158 is 6.59 x 10^{-4} mol/L.Therefore, the answer is that the concentration of perchlorate ion in perchloric acid solution with a pH of 3.158 is 6.59 x 10^{-4 }mol/L.

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The temperature at the top of an atmosphere consisting of an ideal gas with constant density can be found using the ideal gas law, which states that 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.

Assuming the density of the gas is constant throughout the atmosphere, we can express the pressure as P = ρgh, where ρ is the density, g is the acceleration due to gravity, and h is the height.

Since the atmosphere is homogeneous, the pressure at the top (P_top) is the same as the pressure at the bottom (P_bottom), so we have P_top = P_bottom = ρgh.

Using the ideal gas law, we can write ρghV = nRT, where V is the volume of the gas.

Assuming the volume of the gas is constant, we can cancel out V, and rearranging the equation, we get T_top = (nRT_bottom)/(nR) = T_bottom.

Therefore, the temperature at the top of the atmosphere would be the same as the temperature at the bottom.

In practice, however, it is not possible for an atmosphere to have constant density all the way to the top. As we go higher in the atmosphere, the density decreases due to decreasing pressure and temperature. This is because gravity becomes weaker at higher altitudes. Therefore, in reality, the temperature would decrease as we move higher in the atmosphere.

So, while a homogeneous atmosphere with constant density all the way to the top cannot exist in practice, it can be considered as an idealized scenario for understanding certain aspects of atmospheric behavior.

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Answer:

1. Jupiter

2. Mercury

3. Venus

4. Venus

5. Jupiter

6. Neptune

7. Mercury

8. Saturn (used to be Jupiter)

The efficient quantity of SO2 emissions that should be released from the power plant is 16 hundred tons.

The efficient quantity of SO2 emissions that should be released from the John Amos power plant can be determined by equating the marginal damage costs (MDC) and marginal control costs (MCC). In this case, the MDC is given by 20Q (where Q is the quantity of SO2 emissions in hundreds of tons), and the MCC is given by 400 - 5Q.

To find the efficient quantity, we set MDC equal to MCC:

20Q = 400 - 5Q

Simplifying the equation, we get:

25Q = 400

Dividing both sides by 25, we find:

Q = 16

Therefore, the efficient quantity of SO2 emissions that should be released from the power plant is 16 hundred tons.

In the model representing MDC and MCC, the x-axis represents the quantity of SO2 emissions (Q in hundreds of tons), and the y-axis represents the cost (in hundreds of dollars). The MDC curve is upward-sloping, starting from the origin and increasing at a constant rate of 20. The MCC curve is downward-sloping, starting at 400 and decreasing at a constant rate of 5. The efficient quantity of 16 is labeled on the x-axis.

The areas of total costs for damages and control can be identified on the graph. The area under the MDC curve represents the total cost of damages caused by the emissions, while the area under the MCC curve represents the total cost of implementing control measures to reduce the emissions. The goal is to minimize the sum of these costs, which is achieved at the point where the MDC and MCC curves intersect, corresponding to the efficient quantity of emissions.

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Answer:

10 grams

Explanation:

The mass equals the density times the volume it displaces, so 5*2 = 10 grams. If you look at the units, you will see that they also cancel out.
you have 5 grams / ml, and 2 ml, so when 5 grams/ml and 2 ml are multiplied, the result is 10 grams*ml/ml, and since ml/ml = 1, the final unit of the answer would be 10 grams.

Answer:

11: D

12: C

last picture: A

Explanation:

hope this helps