How many moles of aluminum are needed to react completely with 1.8 mol FeO?
2Al + 3FeO ---> Al2O3 + 3Fe
Show work pls

Answer:

Explanation:

Solubility of KNO₃ at 20° C = 32 g / 100g of water

that means , per 100 g of water maximum of 32 g of  KNO₃ can be dissolved at 20° C .

Solubility of KNO₃ at 40° C = 62 g / 100g of water

that means , per 100 g of water maximum of 62 g of  KNO₃ can be dissolved

40° C.

So when a saturated solution in which maximum KNO₃ has been dissolved is cooled from  40° C to 20° C , due to decrease in solubility at lower temperature some KNO₃ will come out of the solution . Per 100 gram of saturated solution , 62 - 32 = 30 g of KNO₃ will precipitate out or come out of water . They can be filtered out .

Answer:

12000m & 12km

Explanation:

covert 20mins into seconds.

20 x 60= 1200seconds

distance = speed x time

distance = 10 x 1200

distance = 12000m

1km=1000m

12000/1000= 12km

hope that helps :)

Shale is a type of sedimentary rock that is formed from the accumulation of clay and silt-sized particles.

A rock's mass-spectrum is a graph that shows the relative abundance of each element present in a rock sample. The graph is created by using a mass spectrometer, an instrument that separates the different elements in a sample by their atomic mass. The resulting graph shows the relative abundance of each element as a peak, with the height of the peak representing the concentration of that element.

From the first attachment

The Cambrian period, which occurred around 540 million years ago, is known for the development and diversification of various forms of life,  The rocks from this period are typically composed of shallow marine sandstones and shales, with some limestone formations. The mass-spectrum of these rocks would likely show a high concentration of calcium and carbon, as well as traces of other elements such as silicon and oxygen.

The Ordovician period, which occurred around 490-443 million years ago, is characterized by the diversification of marine life, including the first appearance of fish and the diversification of brachiopods, bryozoa, and corals. The rocks from this period are typically composed of shallow marine sandstones and shales. The mass-spectrum of these rocks would  show a high concentration of calcium and carbon,

The Silurian period, which occurred around 443-416 million years ago, is characterized by the diversification of marine life, including the first appearance of jawed fish and the diversification of coral reef communities.  The mass-spectrum of these rocks would likely show a high concentration of calcium and carbon, as well as traces of other elements such as silicon and oxygen.

The Devonian period, whicoccurred around 416-359 million years ago, is characterized by the diversification of land plants and the first appearance of amphibians. The rocks from this period are typically composed of a mix of marine and terrestrial sediments, including sandstones, shales, and limestones. The mass-spectrum of these rocks would likely show a high concentration of calcium and carbon, as well as traces of other elements such as silicon and oxygen.

The Carboniferous period, which occurred around 359-299 million years ago, is characterized by the diversification of land plants, including the first appearance of trees, and the first appearance of reptiles. The rocks from this period are typically composed of a mix of marine and terrestrial sediments, including sandstones, shales, and coal deposits. The mass-spectrum of these rocks would likely show a high concentration of carbon, as well as traces of other elements such as silicon and oxygen.

The Permian period, which occurred around 299-252 million years ago, is characterized by the diversification of reptiles, including the first appearance of dinosaurs. The rocks from this period are typically composed of a mix of marine and terrestrial sediments, including sandstones, shales, and limestones. The mass-spectrum of these rocks would likely show a high concentration of calcium and carbon, as well as traces of other elements such as silicon and oxygen.

Table C description

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The mass of the Mg is  0.1 g

Stoichiometry is the quantitative relationship between the reactants and products in a chemical reaction. It involves determining the mole ratios of the reactants and products based on the balanced chemical equation for the reaction.

To find the stoichiometry of a reaction, you need to start with a balanced chemical equation that shows the reactants and products and their respective coefficients. The coefficients in the balanced chemical equation represent the mole ratios of the reactants and products in the reaction.

The equation of the reaction is;

Mg + 2HCl ----> MgCl2 + H2

We know that;

1 mol of the H2 occupies 22400 mL

x  moles of H2 occupies 94.1 mL

x = 1 mol * 94.1 mL/ 22400 mL

x = 0.0042 moles

Now;

If 1 mole of Mg produces 1 mole of H2 then 0.0042 moles of Mg is required.

Hence the mass of Mg = 0.0042 moles * 24 g/mol

= 0.1 g

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Answer:

When two or more atoms are chemically joined together, this is called a molecule. In some cases, such as hydrogen and oxygen, the molecule is made entirely of the same atom, such as hydrogen gas (a molecule) is made entirely of two hydrogen atoms. Here, converting molecules to atoms is as simple as dividing by two.

Atoms can join together - they form bonds together - to make MOLECULES. For example, two atoms of hydrogen hook together to form a molecule of hydrogen

The combine mass of the sled and the rider, given that each dog pulled with a force of 30 N is 200 Kg

We know that force is related to mass and acceleration according to the following formula:

Force (F) = mass (m) × acceleration (a)

F = ma

With the above formula, we can determine the combined mass of the sled and rider. Details below.

From the question given above, the following data were obtained:

The combined mass can be obtained as follow:

Force = mass × acceleration

240 = mass × 1.2

Divide both sides by 1.2

Mass = 240 / 1.2

Mass = 200 Kg

Thus, the combine mass is 200 Kg

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Answer:

17.1 Liters

Explanation:

It's a gas law question (more specifically a Charles's Law question). Formula is V1/T1 = V2/T2. You're given V1 and T1 and T2. However, in order to use the equation, temperature needs to be in Kelvins (by subtracting the degrees C from 273) for the numbers to work (among other reasons, the 0 degrees C will always give you an answer of zero or undefined). Placing all temps in kelvins makes the answers come out right. So 20L/273K = xL/233K gives you the answer when you cross-multiply.

Considering the Charles's law, a weather balloon calibrated at 0.00 °C to have a volume of 20.0 L has  17.07 L at -40.0 °C, assuming pressure is held constant.

The gas laws are a set of chemical and physical laws that allow determining the behavior of gases in a closed system. The parameters evaluated in these laws are pressure, volume, temperature and moles.

Charles's law is one of the gas laws. It relates the volume and the temperature of a certain quantity of ideal gas, kept at a constant pressure.

This law states that, at constant pressure, the volume of a gas is directly  proportional to its temperature. In other words, for a given sum of gas at constant pressure, as the temperature increases, the volume of the gas increases, and as the temperature decreases, the volume of the gas decreases.

Mathematically, Charles's law says that the quotient that exists between the volume and the temperature will always have the same value:

\(\frac{V}{T}=k\)

Being an initial state 1 and a final state 2, it is true:

\(\frac{V1}{T1}=\frac{V2}{T2}\)

In this case, you know:

Replacing:

\(\frac{20 L}{273 K}=\frac{V2}{233 K}\)

Solving:

\(V2=233 K x\frac{20 L}{273 K}\)

V2=17.07 L

Finally, a weather balloon calibrated at 0.00 °C to have a volume of 20.0 L has  17.07 L at -40.0 °C, assuming pressure is held constant.

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Answer:

Atoms that are isotopes have the same number of protons.

The reactant concentration in a first-order reaction was 7.60 x 10⁻²M after 35.0 s and 5.50 x 10⁻³ M after 85.0s. The rate constant of the first-order reaction is 0.0312 s⁻¹.

To find the rate constant (k) of a first-order reaction, we can use the equation:

ln(reactant concentration at t=0 / reactant concentration at t) = kt

First, we need to calculate the reactant concentration at t=0 using the initial value (t=35.0s) and the rate constant:

ln(7.60 x 10⁻² M / reactant concentration at t=0) = k(35.0 s)

ln(7.60 x 10⁻² M / reactant concentration at t=0) = 35.0 s * k

reactant concentration at t=0 = 7.60 x 10⁻²M / e^(35.0 s * k)

Now we can use the second set of data (t=85.0s) to find the rate constant:

ln(reactant concentration at t=0 / 5.50 x 10⁻³ M) = k(85.0 s)

ln(7.60 x 10⁻² M / 5.50 x 10⁻³ M) = 85.0 s * k

k = ln(7.60 x 10⁻² M / 5.50 x 10⁻³ M) / 85.0 s

k = 0.0312 s⁻¹

Therefore, by calculating we get that the rate constant of the first-order reaction is 0.0312 s⁻¹.

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Answer:

50.0 °C

Explanation:

If all other variables are being held constant, you can find the temperature using Guy-Lussac's Law. The equation looks like this:

P₁ / T₁ = P₂ / T₂

In this equation, "P₁" and "T₁" represent the initial pressure and temperature. "P₂" and "T₂" represent the final pressure and temperature. You can find the missing temperature (T₂) by plugging the given values into the equation and simplifying.

P₁ = 405 pKa                    P₂ = 1013 pKa

T₁ = 20 °C                         T₂ = ? °C

P₁ / T₁ = P₂ / T₂                                              <----- Guy-Lussac's Law

405 pKa / 20 °C = 1013 pKa / T₂                  <----- Insert values

20.25 = 1013 pKa / T₂                                   <----- Divide 20 from 405

20.25 x T₂ = 1013 pKa                                  <----- Multiply both sides by T₂

T₂ = 50.0 °C                                                  <----- Divide both sides by 20.25

Answer: c) reflection

Explanation:

Answer:

The answer is C

Explanation:

The half-life of a first-order reaction is 13 min. If the initial concentration of reactant is 0. 085 m, it takes 10.6  min for it to decrease to 0. 055 m.

In a first-order reaction, the half-life is the time it takes for the concentration of the reactant to decrease by half. Given that the half-life is 13 min, we can calculate the rate constant using the formula: k = 0.693 / t(1/2), where t(1/2) is the half-life.

Plugging in the values, we get k = 0.693 / 13 = 0.0531 min⁻¹. Now, we can use the rate constant to calculate the time it takes for the concentration to decrease from 0.085 m to 0.055 m.

Using the equation ln(C₀ / C) = k * t, where C₀ is the initial concentration, C is the final concentration, k is the rate constant, and t is the time, we find that t = (ln(0.085 / 0.055)) / 0.0531

≈ 10.6 min.

Therefore, it takes approximately 10.6 minutes for the concentration to decrease to 0.055 m.

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Answer:

YesEdit: sorry I thought you asked "Is Sodium a metal?" It is a metal because it is on the left side of the periodic table and it has metallic properties such as:

It is malleable

Shiny when polished

Forms positive ions when it reacts

And has a high boiling pointpoint

Explanation:

Answer:

Carbon trisulfide or tetracarbon trisulfide.

Explanation:

I don't know if this compound actually exists.  The C is carbon and the S is sulfur.  The carbon retains its name and is in first position in the name.  A compound of sulfur is given the nickname "sulfide."  The number of S atoms needs to be identified using the latin prefix "tri."  The number of C atoms is often not identified in chemical naming, based on the irritating assumption that anyone looking at the three sulfurs would be able to determine that 3 carbons are necessary.  But that is often not obvious, as in this case.  So I prefer adding the latin prefix for 4 (tetra-) for the sulfur, to make it tetrasulfur trisulfice.  {Try fitting that into a bottle}.

The movement of an electron from a higher energy level to a lower energy level in an atom, a photon is emitted.

Photon can be defined as those particles in a quantum of light. It is also defined as a particle of light.

However, Photons are usually emitted or released when electrons moved from a higher energy level to a lower energy level.

An atom is the smallest particles of an element which can take part in a chemical reaction.

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Answer:

orange

Explanation:

Answer:

NaCl(aq) + AgNO3(aq) Sodium Silver chloride nitrate AgCl(s) + NaNO3(aq) Silver Sodium chloride nitrate

The missing parts in the table is given below

An atom is composed of a centrally placed nucleus (containing protons and neutrons) and a cloud of electrons revolving round it.

Mass number (number of nucleon) = Proton + Neutron

Charge = Proton – Electron

i. Determination of the nucleon number

Nucleon number = Proton + Neutron

Nucleon number = 11 + 12

Nucleon number = 12

ii. Determination of the symbol

We'll begin by determining the charge of the particle. This is illustrated below:

Charge = Proton – Electron

Charge = 11 – 10

Charge = +1

From the periodic table, the element with proton number of 11 is sodium, Na. Since the particle B has a charge of +1, the symbol of particle of B is Na⁺

i. Determination of the number of electrons

Charge = Proton – Electron

–2 = 8 – Electron

Collect like terms

–2 – 8 = – Electron

– 10 = – Electron

Electron = 10

ii. Determination of the nucleon number

Nucleon number = Proton + Neutron

Nucleon number = 8 + 8

Nucleon number = 16

i. Determination of the number of protons

Charge = Proton – Electron

3 = Proton – 10

Collect like terms

3 + 10 = Proton

Proton = 13

ii. Determination of the number of neutrons

Nucleon number = Proton + Neutron

28 = 13 + Neutron

Collect like terms

28 – 13 = Neutron

Neutron = 15

Complete question

See attached photo

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Answer: i think it is A

Explanation:

hope this helps!

The number of moles of solute is 0.264 moles.

The concentration of a solution can be determined by calculating the number of moles of solute present in a given volume. The concentration of a glucose solution given is 0.750 m, which means that there are 0.750 moles of glucose present in 1 liter of the solution.

To calculate the number of moles of solute present in 352 ml of this solution, we must first convert 352 ml to liters. This is done by dividing 352 by 1000, giving 0.352 liters.

To calculate the number of moles of glucose in this volume of solution, we must multiply 0.750 moles by 0.352 liters, giving 0.264 moles.

This means that in a volume of 352 ml of a solution with a concentration of 0.750 m, there are 0.264 moles of glucose present.

Therefore, the number of moles of solute present in a volume of 352 ml of glucose solution is 0.264 moles.

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The curing kinetics of phenol formaldehyde resin refers to the process of the resin hardening or solidifying over time. This resin is commonly used in the production of wood-based composite materials, such as plywood and particleboard.  

When phenol formaldehyde resin is used with wood substrates, such as wood chips or fibers, it interacts with the wood on a molecular level. This interaction occurs through a combination of physical adhesion and chemical bonding. The resin penetrates the porous structure of the wood and forms bonds with the cellulose and lignin present in the wood fibers.

In summary, the curing kinetics of phenol formaldehyde resin involve the hardening of the resin through chemical reactions, while the wood-resin interactions involve the bonding of the resin to the wood substrates. The presence of wood substrates can impact the curing process by absorbing curing agents and influencing the adhesion between the resin and the wood.

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Similarities in nucleotide and amino acid sequences is that, the polypeptide that was initially transcribed by the gene follows the linear nucleotide sequence of the mRNA.

Sequence similarities in biological components, such as those in nucleotide and amino acid composition, can reveal details about the evolutionary relationships of organisms. Nucleotide sequence similarity can be used to create evolutionary trees and suggests a shared ancestry of the organisms. Comparable amino acid sequences between two proteins can suggest that their structures or activities are similar.

A gene's nucleotide sequence is converted into an mRNA, which is subsequently transcriptionally processed to create a string of amino acids. Each amino acid in a protein is determined via translation from the nucleotide sequence of a gene, which is read in sets of three nucleotides. In order to translate a gene's nucleotide sequence into mRNA, it must first be translated into groups of three nucleotides that designate each amino acid. A gene's nucleotides each designate a certain protein amino acid.

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Answer:

3.33 tanques de O₂

Explanation:

Basados en la reacción:

2C₂H₂(g) + 5O₂(g) → 4CO₂(g) + 2H₂O(g)

2 moles de acetileno reaccionan con 5 moles de oxígeno produciendo 4 moles de dióxido de carbono y 2 moles de agua

La ley de Avogadro dice que el volumen de un gas bajo temperatura y presión constantes es proporcional a las moles de este gas. Así, como 2 moles de acetileno reaccionan con 5 moles de oxígeno, los litros de O₂ necesarios para quemar 9340L de acetileno son:

9340 L C₂H₂ × (5 moles O₂ / 2 moles C₂H₂) = 23350L de O₂

Si un tanque contiene 7x10³ L de O₂ serán necesarios:

23350L O₂ ₓ (1 tanque / 7x10³L) = 3.33 tanques de O₂

Explanation:

Review and Study Material Before Going to Class. ...

Take Good Notes. ...

Practice Daily. ...

Take Advantage of Lab Time. ...

Use Flashcards. ...

Use Study Groups. ...

Break Large Tasks Into Smaller Ones.

reading a variety of chemistry books

Answer:

An ion is an atom or molecule that carries an electric charge.

Ions are identified by the use of a superscript to show the sign and size of their electric charge.

Negatively charged ions are called anions, and positively charged ions are called cations.

Explanation:

An atom is the smallest unit of ordinary matter that forms a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small, typically around 100 picometers across.

Answer:

c. The rusting of the joints of a metal children’s swing set.

Explanation:

By definition, chemical property describes the ability of a substance to undergo a specific chemical change.

In the definition above, the key words are; "Chemical change".

Generally, chemical changes are irreversible. This means we just have t observe the options and pick the one that contains an irreversible change.

Upon doing ths, the correct option is;

c. The rusting of the joints of a metal children’s swing set.

This is because rusting is a chemical change and is irreversible.

Answer: x will be the element cobalt

Answer:

Yes, it is correct.

Explanation:

400 cm = 4 m

40 m = 40 m

0.4 km = 400m

Therefore, 400 cm < 40 m < 0.4 km

Answer:

Explanation:

400 centimeter....... smallest

0.4 kilometer .............. middlest

40 meter..................... greatest