Twenty-four grams of magnesium metal reacts with sixteen grams of oxygen gas to form magnesium oxide. According to the law of conservation of mass, how much magnesium oxide will there be after the chemical change is complete?
24 g
30 g
40 g
16 g

Answer: Option (c) is the correct answer.

Explanation:

According to law of conservation of energy, energy can neither be created nor it can be destroyed as it can only be converted from one form to another.

For example, in the given situation electrical energy is converted into heat energy.

This means that the total amount of the electrical energy is actually equal to the total amount of heat energy. As only change in the form of energy has taken place.

Thus, we can conclude that as electrical energy is converted into heat energy, the total amount in the system remains the same.

c. this is the real answer lol

Final answer:

A book is sitting on the table at rest. The forces acting on the book include gravity pushing up and friction pushing to the right, and these forces are balanced. So the correct option is C.

Explanation:

The force acting on a book sitting at rest on a table is gravity pushing down and the table pushing up with a normal force. Since the book is at rest, these forces must be equal in magnitude but opposite in direction, and therefore they are balanced. Option C, gravity pushing down and the table pushing up; balanced, is the correct answer. The force of gravity is also known as the book's weight, and since the book is not accelerating, the normal force must be equal to the gravitational force to maintain equilibrium, according to Newton's first law of motion.

Answer: The correct answer is-

Flow of energy in an ecosystem ( a large community of life forms that interact with each other as well as their physical environment in a particular area) takes place through food chain.

A food chain is a linear network of different organisms ( occupying different trophic levels) where organisms at one trophic level consumes organisms at previous trophic level and energy flow takes place in the form of organic matter.

Producers ( such plants) prepare their own food through photosynthesis and occupy the first trophic level.

Producers are eaten by primary consumers ( which are generally herbivores such as rabbits).

Primary consumers are eaten by secondary consumers, which are then eaten by tertiary consumers that are eaten by final consumers and then decomposers ( such as Fungi).

Example- Grass → Grasshopper → Frog→ Snake → Hawk → Fungi

Answer:

348

Explanation:

It has unequally shared electrons is the right answer.

Answer: Option B

Explanation: Unequally shared shared electrons

i just got it right on the mastery test^^^^^

Answer:

200 g/mol is the molar mass of the unknown gas.

Explanation:

Effusion is defined as volume of gas dispersed in a given interval of a time.

[tex]R=\frac{Volume}{time}[/tex]

Number of moles of gas are directly proportional to the volume occupied by the gas.

[tex]moles \propto Volume[/tex] (at constant temperature and pressure)

[tex]\frac{n_1}{V_1}=\frac{n_2}{V_2}[/tex]

If n moles of unknown gas occupies V volume then n moles of oxygen will occupy:

[tex]V_1=\frac{n\times V}{n}=V[/tex]

The n moles of unknown gas pass through a tiny hole in 75 seconds.The effusion rate is give as:

[tex]R=\frac{V}{75 s}[/tex]

The n moles of oxygen gas pass through a tiny hole in 30 seconds.The effusion rate is give as:

[tex]R'=\frac{V}{30 s}[/tex]

According to Graham law: the effusion rate is inversely proportional to the square root of molar mass of the gas.

[tex]\frac{R}{R'}=\sqrt{\frac{32 g/mol}{M}}[/tex]

[tex]\frac{\frac{V}{75 s}}{\frac{V}{30 s}}=\sqrt{\frac{32 g/mol}{M}}[/tex]

[tex]M=\frac{32 g/mol\times 75\times 75}{30 \times 30}=200 g/mol[/tex]

200 g/mol is the molar mass of the unknown gas.

The molar mass of the unknown gas that diffused in the experiment is 200 g/mol.

The given parameters;

The rate of diffusion of the gases is calculated using Graham's law of diffusion as follows;

[tex]\frac{R_1}{R_2} = \frac{t_2}{t_1} = \sqrt{\frac{M_2}{M_1} } \\\\(\frac{t_2}{t_1} )^2 = \frac{M_2}{M_1} \\\\(\frac{30}{75})^2 = \frac{32}{M_1} \\\\0.16 = \frac{32}{M_1} \\\\M_1 = \frac{32}{0.16} \\\\M_1 = 200 \ g/mol[/tex]

Thus, the molar mass of the unknown gas that diffused in the experiment is 200 g/mol.

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The Earth is composed of four different layers. Many geologists believe that as the Earth cooled the heavier, denser materials sank to the center and the lighter materials rose to the top. Because of this, the crust is made of the lightest materials (rock- basalts and granites) and the core consists of heavy metals (nickel and iron).

Decreasing the volume of an equilibrium mixture by a factor of 3 will cause a corresponding increase in pressure. According to Le Châtelier's Principle, the system will adjust to reduce this increase in pressure by shifting the equilibrium to the side with fewer moles of gas. Therefore, the mole fraction of chlorine gas, χcl2, will decrease.

To understand how changes in conditions might affect the mole fraction of chlorine gas, χcl2, it's necessary to refer to Le Châtelier's principle, which states that a system in equilibrium will adjust so as to reduce any stress placed on it. The stress can be a change in pressure, volume, or concentration of reactants or products.

If you decrease the volume of the system by a factor of 3, the system will adjust to decrease the pressure by shifting the equilibrium to the side with fewer moles of gas. Given the reaction SbCl3 (g) + Cl2 (g) and knowing that chlorine molecules dissociate as per Cl2 (g) -> 2Cl(g), the system will respond to the increased pressure by shifting to the right to reduce the total number of gas molecules. This decrease of chlorine gas on the left side of the reaction will cause its mole fraction to decrease.

It is important to remember that changes shifting the equilibrium according to these process follow the rules defined by chemical equilibrium concepts and reaction quotient (Qc) values.

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Answer:  Spiral

Explanation:

A galaxy contains billions of stars, dust and gases which are bound together by gravity. Galaxies have mainly three shapes:

Spiral - It has nucleus at the center from which arms extend outwards and wrap around like a spiral. Milky way is a spiral galaxy.

Elliptical - It is like flat ellipse. It has now characteristic features.

Irregular - It does not have any definite shape.

The most common shape of galaxy is the spiral shape.

The activation energy is usually symbolized by 'E' or 'Ea' in many diagrams. When analyzing biochemical reactions with and without an enzyme, the activation energy with an enzyme may be represented by 'b', while without an enzyme might be represented by 'a'.

In most diagrams that represent energy in a chemical reaction, the activation energy is typically represented by the letter 'E' or 'Ea'. The activation energy is the energy necessary for a chemical reaction to occur. In the context of a biochemical reaction influenced by an enzyme, the activation energy would be represented separately for the reaction with and without the enzyme.

For example, in a reaction without an enzyme, it might be represented by the letter 'a', which indicates a large amount of activation energy required. But in a reaction with an enzyme, it might be represented by the letter 'b', signifying the lower amount of activation energy required due to enzyme catalysis. Hence, enzymes lower the activation energy making the reactions occur more readily.

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The number of moles in 17.0g sodium chloride is 0.291 moles

In the International System of Units, Mole is the base unit of the amount of any substance.

The mass of NaCl is 17.0 g

The molar mass of Na is 22.99 g/mol

The molar mass of Cl is 35.45 g/mol

The molar mass of NaCl will be

(22.99 g/mol + 35.45 g/mol) = 58.44 g/mol

[tex]\rm Number\;of \;moles= \dfrac{mass}{molar\;mass}\\\\\\\rm Number\;of \;moles= \dfrac{17.0 g}{58.44\; g/m} =0.291 mol[/tex]

Thus, the number of moles in 17.0g sodium chloride is 0.291 moles.

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To produce 19.1 moles of water vapor when carbon dioxide is in excess, 19.1 moles of hydrogen gas are needed, based on the stoichiometry of the water-gas shift reaction.

To determine how many moles of hydrogen gas would be needed to react with excess carbon dioxide to produce 19.1 moles of water vapor, we need to consider the balanced chemical equation for the reaction. The reaction in question is not stated, but it is likely a form of the water-gas shift reaction, which is:

CO2 + H2 → CO + H2O

From the equation, we can see that for every mole of H2O produced, one mole of H2 is required, assuming that carbon dioxide (CO2) is in excess.

Therefore, if we have 19.1 moles of water vapor (H2O), we need 19.1 moles of hydrogen gas (H2).

Final answer:

To produce 19.1 moles of water vapor by reacting hydrogen gas with excess carbon dioxide, 19.1 moles of hydrogen gas would be required, assuming a 1:1 stoichiometry.

Explanation:

To determine how many moles of hydrogen gas are needed to react with excess carbon dioxide to produce 19.1 moles of water vapor, we need to consider the balanced chemical equation:

H₂ (g) + CO₂ (g) → H₂O (g) + CO (g)

However, the provided examples do not directly address this reaction. Instead, we can deduce from the given information that:

In a similar vein, if we assume the reaction consuming hydrogen and carbon dioxide produces water and carbon monoxide in a 1:1 stoichiometry (as in the Sabatier process), we have:

H₂ (g) + CO₂ (g) → H₂O (g) + CO (g)

For every mole of water produced, one mole of hydrogen is required. Therefore, for 19.1 moles of water, 19.1 moles of hydrogen gas are needed.

A) The most important factor for solubility is temperature

We define the solubility of a substance in a solvent at a particular temperature

a) for solids the solubility increases with increase in temperature

b) for gas the solubility decreases with increase in temperature

So temperature will have huge effect on solubility of a saturated solution

B) the amount of extra time spent stirring the solution will hardly any effect or may have a very little effect. As stirring helps in solubility and if we have a saturated solution then it will not affect the solubility of the solution

C) The solubility is affected by the pressure on solvent

For gaseous solute the solubility is proportional to the pressure exerted on the solvent. More the pressure more the solubility.

D) the other solutes may affect the solubility as they may react with the solute or may interfere with the solute solvent interaction

Hence answer is "B"

Answer : Option C) Krypton - 84

Explanation : The average atomic mass recorded on the periodic table for krypton is 83.80 u. This indicates that the most abundant isotope of krypton is Krypton - 84.

As the natural abundance of krypton - 84 is higher than the other isotopes of the krypton, which is 56.99 percent. This the most stable form of Kr that exists in nature. Rest other isotopes are not that readily available and also not that stable as compared to Krypton - 84.

Krypton - 83 has natural abundance as 11.50 percent and krypton - 82 has natural abundance 11.59 percent.

So, this clearly explains that the most abundant krypton isotope is Krypton - 84.

Answer:

Na2O

Explanation:

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