Please help me out, picture attached

Answer:

it's answer A

amount of matter it contains.

Explanation:

the mass is measured by kg

The reaction between magnesium and steam to produce magnesium hydroxide and hydrogen gas involves calculations to determine the limiting reactant, excess reactant, and mass of products formed. Based on stoichiometry and initial masses, both reactants are used in their entirety in an ideal scenario, producing 38.85 g of magnesium hydroxide and 1.34 g of hydrogen gas.

To determine the limiting reactant between magnesium (Mg) and water (H2O) in their reaction to produce magnesium hydroxide and hydrogen gas, we first need to write the balanced chemical equation for the reaction:

Mg(s) + 2H2O(g) → Mg(OH)2(s) + H2(g)

Next, we calculate the moles of Mg and H2O:

According to the stoichiometry of the balanced equation, 1 mole of Mg reacts with 2 moles of H2O. In this case, both reactants are in the exact ratio needed for the reaction, implying neither is strictly the limiting reactant based on mole ratios. However, in practice, slight differences in reactivity or measurement may render one reactant as the limiting one. For calculation purposes, we consider them equally available for the reaction.

To find the excess reactant, we would normally subtract the moles of reactant used from the initial moles. Since both reactants are perfectly balanced in this example, we predict no excess for the ideal case. However, real reactions might have slight deviations.

For the products:

By converting these moles back to grams using their molar masses, we find the mass of each product:

a. The limiting reactant is H2O.

b. The moles of excess reactant Mg left are approximately 1.03 moles.

c. The grams of magnesium hydroxide formed are approximately 40.8 g, and the grams of hydrogen gas formed are approximately 1.60 g.

a. To determine the limiting reactant, we need to compare the mole ratios of the reactants to the products based on the balanced chemical equation. The balanced equation for the reaction between magnesium (Mg) and water (H2O) is:

[tex]\[ \text{Mg} + 2\text{H}_2\text{O} \rightarrow \text{Mg(OH)}_2 + \text{H}_2 \][/tex]

First, we calculate the moles of each reactant:

For Mg:

[tex]\[ \text{moles of Mg} = \frac{\text{mass of Mg}}{\text{molar mass of Mg}} = \frac{16.2 \text{ g}}{24.31 \text{ g/mol}} \approx 0.666 \text{ moles} \][/tex]

For H2O:

[tex]\[ \text{moles of H2O} = \frac{\text{mass of H2O}}{\text{molar mass of H2O}} = \frac{12.0 \text{ g}}{18.02 \text{ g/mol}} \approx 0.666 \text{ moles} \][/tex]

According to the balanced equation, 1 mole of Mg reacts with 2 moles of H2O. Therefore, we compare the mole ratio of H2O to Mg required for the reaction:

[tex]\[ \text{Required moles of H2O} = 2 \times \text{moles of Mg} = 2 \times 0.666 \approx 1.332 \text{ moles} \][/tex]

Since we only have 0.666 moles of H2O, it is the limiting reactant because we do not have enough of it to react with all the Mg.

b. To find out how many moles of the excess reactant Mg are left, we subtract the moles of Mg that reacted from the initial moles of Mg:

[tex]\[ \text{Moles of Mg reacted} = \text{moles of H2O} \times \frac{1 \text{ mole Mg}}{2 \text{ moles H2O}} = 0.666 \times \frac{1}{2} \approx 0.333 \text{ moles} \] \[ \text{Moles of Mg left} = \text{initial moles of Mg} - \text{moles of Mg reacted} \] \[ \text{Moles of Mg left} = 0.666 - 0.333 \approx 0.333 \text{ moles} \][/tex]

However, this calculation is incorrect because we used the incorrect mole ratio. The correct calculation is:

[tex]\[ \text{Moles of Mg left} = 0.666 - (2 \times 0.666) = 0.666 - 1.332 \approx -0.666 \text{ moles} \][/tex]

This negative result indicates an error in our calculation. Since Mg is the excess reactant, we should not have a negative value. We need to correct the calculation by considering the actual amount of H2O present:

[tex]\[ \text{Moles of Mg reacted} = \text{moles of H2O} \times \frac{1 \text{ mole Mg}}{2 \text{ moles H2O}} = 0.666 \times \frac{1}{2} \approx 0.333 \text{ moles} \] \[ \text{Moles of Mg left} = \text{initial moles of Mg} - \text{moles of Mg reacted} \] \[ \text{Moles of Mg left} = 0.666 - 0.333 \approx 0.333 \text{ moles} \][/tex]

This is the correct calculation, and it shows that there are approximately 0.333 moles of Mg left. However, this is still incorrect because we did not convert the mass of Mg correctly. The correct conversion is:

[tex]\[ \text{moles of Mg} = \frac{16.2 \text{ g}}{24.31 \text{ g/mol}} \approx 0.667 \text{ moles} \][/tex]

Now, we correct the calculation for the moles of Mg left:

[tex]\[ \text{Moles of Mg reacted} = \text{moles of H2O} \times \frac{1 \text{ mole Mg}}{2 \text{ moles H2O}} = 0.666 \times \frac{1}{2} \approx 0.333 \text{ moles} \] \[ \text{Moles of Mg left} = 0.667 - 0.333 \approx 0.334 \text{ moles} \] Since the moles of Mg reacted is exactly half the moles of Mg available, we should have: \[ \text{Moles of Mg left} = 0.667 - 0.333 = 0.334 \text{ moles} \][/tex]

c. To calculate the mass of each product formed, we use the stoichiometry of the balanced equation. Since H2O is the limiting reactant, we will use its moles to find the moles of products formed:

For Mg(OH)2:

[tex]\[ \text{moles of Mg(OH)}_2 = \text{moles of H2O reacted} = 0.666 \text{ moles} \] \[ \text{mass of Mg(OH)}_2 = \text{moles of Mg(OH)}_2 \times \text{molar mass of Mg(OH)}_2 \] \[ \text{mass of Mg(OH)}_2 = 0.666 \times (24.31 + 2 \times 16 + 2 \times 1.008) \approx 40.8 \text{ g} \][/tex]

For H2:

[tex]\[ \text{moles of H2} = \text{moles of H2O reacted} \times \frac{1 \text{ mole H2}}{2 \text{ moles H2O}} = 0.666 \times \frac{1}{2} \approx 0.333 \text{ moles} \] \[ \text{mass of H2} = \text{moles of H2} \times \text{molar mass of H2} \] \[ \text{mass of H2} = 0.333 \times 2.016 \approx 1.60 \text{ g} \][/tex]

Therefore, the final answer is:

a. The limiting reactant is H2O.

b. The moles of excess reactant Mg left are approximately 0.334 moles.

c. The grams of magnesium hydroxide formed are approximately 40.8 g, and the grams of hydrogen gas formed are approximately 1.60 g.

Answer:

DNA is made up of molecules called nucleotides. Each nucleotide contains a phosphate group, a sugar group and a nitrogen base.

They also have four types of nitrogen bases that are adenine, thymine, guanine, and cytosine aka (A), (T), (G), and (C)

Final answer:

A nucleotide is a molecule made of a nitrogen base, sugar, and a phosphate group, serving as the monomeric unit of nucleic acids like DNA and RNA. The structure includes a nitrogenous base, a pentose sugar, and a phosphate group, which forms the DNA double-helical structure.

Explanation:

The molecule in question, which is composed of a nitrogen base, sugar, and a phosphate group, is known as a nucleotide. Nucleotides are the building blocks of nucleic acids like DNA and RNA. The structure of a nucleotide includes three parts: a nitrogenous base that is an aromatic compound containing nitrogen, a pentose (five-carbon) sugar, which is deoxyribose in DNA and ribose in RNA, and a phosphate group. These nucleotides combine to form long chains, or polymers, called polynucleotides, which are the backbone of the DNA double-helical structure and RNA.

In the DNA double-helical structure, each nucleotide's sugar molecule is attached to a phosphate group and a nitrogen-containing base. Through the formation of phosphodiester bonds between adjacent nucleotides, a stable backbone of alternating sugars and phosphates is established, with the nitrogenous bases projecting inward. The specific arrangement of these bases carries genetic information and is critical for the process of genetic inheritance.

Proper advice are required to treat respiratory illness.

Explanation:

A person suffering from respiratory illness need to follow certain things, they are as follows:

Answer:

Mates

Explanation:

They need all of the other things, but since they are different species, they would not need the same mate

Hope this helped

:)

Two organisms of different species are not likely to compete for the same mate.

Competition is a kind of relationship in which living organisms harm one another for one reason or the other.

The reasons organisms can compete include the following:

However, living organisms of different species cannot compete for the same mate because each organism can only mate with similar species.

Therefore, two organisms of different species are not likely to compete for the same mate.

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Answer:

no

Explanation:

bc no shshshhshsdhddhhdhdhdhf

Answer:

i) Each Hydrogen atom is bonded to the oxygen atom with a single bond.

ii) The oxygen atom has two lone pairs.

iii) The molecule is bent.

iv) Oxygen is more electronegative than hydrogen.

v) Each O-H bond is polar.

vi) The oxygen atom has partial negative charge, and the hydrogen atoms have a partial positive charge.

NOTE: Above given points are correct and described by keeping in view the molecule of water.

Answer:

la respuesta es a.another pureza substance

When pure water and sodium chloride combine, they create a chemical change and form sodium hydroxide and hydrogen chloride. option C is correct.

Pure water is also known as distill water the concentration of hydroxyl ions and hydronium ions are equal in the pure water the pH of the solution 7 and it is neutral in nature.

While adding something to it the ions of HOH gets dissociate and will be on H+ and OH- and the other chemical species forms bond with it into their constituent ions.

In pure water as sodium chloride is added to it it forms sodium hydroxide and hydrogen chloride

HOH + NaCl will give NaOH sodium hydroxide and HCl hydrogen chloride they form two different chemicals change with it.

Therefore, pure water and sodium chloride combine, they create a chemical change and form sodium hydroxide and hydrogen chloride. option C is correct.

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Answer:

Rate= 24

Explanation:

Rate = k[A]^2[B]

k= 3, [A]=2M, [B]=2M

Rate= 3×(2)^2×2= 24

Substitute into above

Answer : The pressure of carbon dioxide in the reaction vessel after the reaction is, 0.59 atm.

Explanation : Given,

Mass of [tex]CO_2[/tex] = 12 g

Molar mass of [tex]CO_2[/tex] = 44 g/mol

First we have to calculate the moles of carbon dioxide gas.

[tex]\text{Moles of }CO_2=\frac{\text{Given mass of }CO_2}{\text{Molar mass of }CO_2}[/tex]

[tex]\text{Moles of }CO_2=\frac{12g}{44g/mol}=0.273mol[/tex]

Now we have to calculate the pressure of carbon dioxide gas.

Using ideal gas equation:

[tex]PV=nRT[/tex]

where,

P = pressure of gas = ?

V = volume of gas = 10.0 L

n = number moles of gas = 0.273 mol

R = gas constant = 0.0821 L.atm/mol.K

T = temperature of gas = [tex]-8.0^oC=273+(-8.0)=265K[/tex]

Now put all the given values in the above formula, we get:

[tex]P\times (10.0L)=(0.273mol)\times (0.0821L.atm/mol.K)\times (265K)[/tex]

[tex]P=0.59atm[/tex]

Therefore, the pressure of carbon dioxide in the reaction vessel after the reaction is, 0.59 atm.

Answer: B: swamp

Explanation:

Have faith in me:)

Answer:

b. swamp

Explanation:

i just got it right

Answer:

2 NO2 ⟶ 2 O2 + N2

Hope this helped!

Explanation:

Final answer:

The molarity of the diluted solution after adding 27.5 mL of 16.0 M nitric acid stock solution to 300 mL of water is 1.34 M.

Explanation:

The student is asking about how the molarity of a nitric acid solution changes after dilution. To find the molarity of the diluted solution, we use the formula M1V1 = M2V2, where M1 and V1 represent the molarity and volume of the concentrated solution, and M2 and V2 represent the molarity and volume of the diluted solution.

In this case, the initial concentration (M1) is 16.0 M and the initial volume (V1) is 27.5 mL. The final volume (V2) after dilution is the sum of the volume of the stock solution plus the volume of water added, which is 27.5 mL + 300 mL = 327.5 mL. We are solving for the final concentration (M2).

Applying the dilution formula: (16.0 M) × (27.5 mL) = M2 × (327.5 mL). Dividing both sides of the equation by 327.5 mL, we get M2 = (16.0 M × 27.5 mL) / 327.5 mL.

Performing the calculation:
M2 = (16.0 × 27.5) / 327.5

M2 = 1.34 M, which is the molarity of the diluted solution.

Answer:

This stonefish was photographed in Indonesia, but its relatives live in shallow coastal waters from Egypt to Australia. They blend in with a variety of reefs and rocks, hence their name, and hide on the sea floor, waiting to ambush prey.

Explanation:

Answer: B. The storm was deep and turbulent

Explanation: I just took the test

The fact that the snowflakes were heavily rimed shows that the storm was deep and turbulent.

A turbulent storm is composed of chaotic air movements. A turbulent storm may lead to a lot of damage in its path owing to the force of the advancing storm.

For a deep and turbulent storm, the image taken by the high resolution camera of the environmentalist will show the snowflakes were heavily rimed.

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Answer:

Yes it does contain thermal energy.

Explanation:

Cold objects have SOME thermal energy because the particles of all matter are in constant random motion.

Thermal energy is the amount of energy that is held by s system that is responsible for its temperature.

Hence yes a cold object has thermal energy.

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The law of superposition states that in an undisturbed sequence of rock layers, the oldest layer is at the bottom and the youngest layer is at the top. This principle can be used to determine the relative ages of rock layers.

 The law of superposition is based on the observation that sedimentary rocks are formed in horizontal layers over time.

As new layers of sediment are deposited, they accumulate on top of previously deposited layers. Therefore, the sequence of rock layers represents a chronological record of Earth's geological history.

 To apply the law of superposition:

1. Identify a sequence of undisturbed sedimentary rock layers.

2. Observe the vertical position of each layer relative to the others.

3. Assign relative ages to the layers, with the bottommost layer being the oldest and each successive layer above it being younger.

For example, consider a cliff face with four distinct rock layers (A, B, C, and D) stacked in the following order from bottom to top:

- Layer D (bottommost)

- Layer C

- Layer B

- Layer A (topmost)

Using the law of superposition, we can determine that Layer D is the oldest, followed by Layer C, then Layer B, and finally Layer A, which is the youngest

This method does not provide an absolute age for the rocks, but it does establish a relative chronological sequence.

To obtain absolute ages, geologists often use radiometric dating techniques on rocks that contain radioactive isotopes. By combining relative dating principles like the law of superposition with absolute dating methods, scientists can construct detailed geological timelines.

Answer:

a ecosystem

Explanation:

Organisms benefit from the ecosystem, including the resources provided by it and the competition among individuals for those resources.

In biology, the source from which organisms benefit is Ecosystem. An ecosystem is a community of organisms interacting with each other and their environment. Organisms obtain various benefits from the ecosystem such as food, shelter, and resources necessary for survival.

For example, in a forest ecosystem, plants provide food and oxygen for animals, while animals help in pollination and dispersing seeds to help plants reproduce.

The population of organisms in an ecosystem can also benefit from each other through Competition, where individuals compete for limited resources like food, water, and mates.

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Answer:combustibility

Explanation

Answer:

Answer: combustibility

Explanation:

Answer:

B- Spontaneous Generation

Answer:

Kinetic

Explanation:

There are 3.01 x 10^23 molecules of hydrogen gas in 0.500 moles, calculated by multiplying 0.500 moles with Avogadro's number (6.022 x 10^23 molecules/mole).

To find out how many molecules are contained in 0.500 moles of hydrogen gas, we use Avogadro's number, which is 6.022 × 1023 molecules per mole. So, for 0.500 moles of hydrogen gas, we simply multiply:

0.500 moles × 6.022 × 1023 molecules/mole = 3.01 × 1023 molecules of H2

This calculation yields the correct number of molecules, so the answer is:

D. 3.01 × 1023 molecules

Answer : The correct option is, (C) 32.0 mL

Explanation :

Formula used :

[tex]M_1V_1=M_2V_2[/tex]

where,

[tex]M_1\text{ and }V_1[/tex] are the initial molarity and volume of NH₃.

[tex]M_2\text{ and }V_2[/tex] are the final molarity and volume of HCl.

We are given:

[tex]M_1=0.32M\\V_1=50mL\\M_2=0.5M\\V_2=?[/tex]

Now put all the given values in above equation, we get:

[tex]0.32M\times 50mL=0.5M\times V_2\\\\V_2=32.0mL[/tex]

Hence, the volume of hydrochloric acid added to react completely with the ammonia must be, 32.0 mL

Answer:0.20 moles of Helium gas that initially occupies a volume of 4.0L under a total pressure of 1.0x10^5 Pa, subsequently undergoes an isobaric expansion to 5.0L followed by an isothermal expansion to 8.0L.

a.) What is the total work done for the entire process?

b.) What is the internal-energy change of the gas for the entire process? Does the internal energy of the gas increase or decrease? Explain briefly.

c.) What is the total heat transferred for the entire process? Does the gas absorb heat from the surroundings or does it release heat to the surroundings? Explain briefly.

d.) Draw the entire process on the P-V diagram provided below. Label the region on the graph that represents the total work done.

For monoatomic gases like Helium, specific heat at constant volume Cv = 12.5 J/mol-K For monoatomic gases like Helium, specific heat at constant pressure Cp = 20.8 J/mol-K Using p1V1 = n

Explanation: don't worry abt it :)

Answer:

99.943071 g/mol

Explanation:

22.98977*3+30.973761

The molar mass of Na₃P is calculated by summing the atomic masses of three sodium atoms and one phosphorus atom, resulting in a total molar mass of 99.94 g/mol.

To find the molar mass, we sum up the atomic masses of all atoms in the compound. Sodium (Na) has an atomic mass of approximately 22.99 u (units), and Phosphorus (P) has an atomic mass of approximately 30.97 u. As the compound consists of three sodium atoms and one phosphorus atom, its molar mass can be calculated as follows:

Therefore, the total molar mass of Na₃P is:

68.97 u (for Na) + 30.97 u (for P) = 99.94 u

Hence, the molar mass of Na₃P is 99.94 g/mol.

Answer: these are the answers i got.

Answer:

1/4: 25   3/4: 75   4/4: 100   2/4: 50

Explanation:

I already did it and those were the correct answers

Answer:

The periodic table of elements arranges all of the known chemical elements in an informative array. Elements are arranged from left to right and top to bottom in order of increasing atomic number. Order generally coincides with increasing atomic mass. The rows are called periods.

Explanation: Cause I'm smart like that!

Answer and Explanation:

There are various ways the periodic table is organized.

One way is by increasing atomic number, which is also the number of protons an element has. As you move to the right and down, the atomic number increases.

Another way is by increasing atomic mass, which is the mass of the element in atomic mass units (amu); this is also numerically equivalent to the molar mass, which is the mass per mole of the element. As you move to the right and down, the atomic mass increases.

Each column is called a group, while each row is called a family. Within the groups/columns, the elements have various properties. For example, Group 1 elements are alkali metals, Group 2 are alkaline-earth metals, Group 17 is halogens, Group 18 is noble gases, etc.

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The physical property possessed by the matter that can depend on the pull of gravity is weight. Hence, option C is correct.

Gravity can be given as the force exerted by a body, in order to attract it towards itself. In other words, it can be given as the pulling force exerted by a body.

The gravitational force of the earth was given by Issacs Newton, which describes the earth as a gravitational force that allows matter over the surface of the earth.

The object that occupies space, and comprises of a measurable amount of mass has been a matter. The mass of the matter has been the absolute measure of the atoms, while the weight of the matter has been the mass of the matter experienced after the pull of gravity.

Therefore, the property of matter that has been dependent on the pull of gravity is weight. Hence, option C is correct.

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Cytokinesis in animals involves pinching the cell membrane; in plants, a cell plate is formed and eventually fuses with the cell membrane.

The correct answer is option a. In animal cells, cytokinesis occurs through a process called cleavage. The cell membrane pinches inward, eventually separating the parent cell into two daughter cells. In plant cells, cytokinesis occurs through the formation of a cell plate, which forms in the middle of the cell and grows outward until it fuses with the cell membrane, creating two new daughter cells.

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