. in a particular experiment, the reaction of 2.5 g of aluminum with 2.5 g of oxygen gas produced 3.5 g of aluminum oxide. the percent yield of the reaction is

Answer:

A

Explanation:

Ur welcome hope it helps :)

Answer:

A.

Explanation:

All the rest is Chemical Change

The chemical equation of the production of ammonia is shown in figure 1 and it shows that the mole ratio for ammonia and nitrogen gas is 2:1.

What is mole ratio?

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It would require 46434 calories of heat to boil 142 g of ammonia.

When a liquid changes form into a gas, the process is called vaporization. You can watch vaporization when you boil a pot of water. Vaporization happens in two ways: evaporation and boiling. Evaporation occurs when sunlight shines on water until it changes to vapor and rises into the air

To calculate the amount of heat required to boil 142 g of ammonia, NH3, we can use the formula:

Heat = mass x heat of vaporization

where the mass is 142 g and the heat of vaporization is 327 cal/g.

Therefore, the heat required to boil 142 g of ammonia is:

Heat = 142 g x 327 cal/g

Heat = 46434 cal

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Answer:

Explanation:

Electron affinity is a measure of the tendency of an atom to gain an electron. The more positive the electron affinity, the greater the tendency for the atom to gain an electron (this means that the negative ion formed after accepting the electron is very stable).

The overall trend is an increase in the tendency to accept electrons (electron affinity values become more positive) from left to right across a period, and from the bottom to the top across a group. The halogens (group 7A) have the highest electron affinity values.  That means that the halide ions are very stable.

As we can see from the atomic radii, the halogens are rather small atoms. Smaller atoms will attract additional electrons more easily since the incoming electrons (added on the outermost shell) will be closer to the nucleus, therefore the attraction will be stronger.

Information regarding specific chemical safety can be found in :  MSDS

MSDS ( material safety data sheet )  is used in the communication of chemical hazards and ways of preventing these hazards while working with them in the laboratory. each section of the MSDS contains unique/specific informations related to each chemical.

Hence we can conclude that information regarding specific chemical safety can be found in MSDS

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This problem is providing a mathematical expression which the result should be expressed with the correct significant figures. At the end, the result is 1209.0 because of the following:

In science, the use of significant figures is crucial as long numbers are not necessarily required when reporting a numerical value, for that reason the importance of reporting measurements with the correct number of significant figures.

In the case of additions, we perform the normal operation as the first step:

1204.2 +4.79613 = 1208.99613

Next, we round the result to the least number of decimal places, in this case one because 1204.2 has just one decimal place, unlike the 4.79613 which has five, so that we round the 8 up to 9 and leave a 0 as the only decimal place:

1209.0

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Answer:

weight of hydrogen÷eq weight of hydrogen=weight of metal÷equivalent weight of metal

yo formula lagayera nikalne

yesma pressure ko kei kaam hunna

Answer:

Hii,kusha

ek problem hó rahi hai mujhe

The amount of excess acetic anhydride is:Amount of excess acetic anhydride = initial amount - amount used = 0.0196 mol - 0.0145 mol = 0.0051 molTherefore, 0.0051 mol of acetic anhydride is used in the reaction.

The balanced chemical equation for the reaction of salicylic acid with acetic anhydride is given as follows: 2C7H6O3 + C4H6O3 ⟶ 2C9H8O4 + H2OIn this equation, salicylic acid (C7H6O3) is the limiting reagent and acetic anhydride (C4H6O3) is the excess reagent. The stoichiometric ratio between salicylic acid and acetic anhydride is 2:1. This means that for every two moles of salicylic acid, one mole of acetic anhydride is required. To find out how much of the excess reactant is used when the reaction is complete, we need to determine the limiting reagent and the excess reagent. We can do this by calculating the amount of product that each reactant can produce and comparing the values.Let's first calculate the number of moles of each reactant:No. of moles of salicylic acid = mass/molar mass = 2/138 = 0.0145 molNo. of moles of acetic anhydride = mass/molar mass = 2/102 = 0.0196 molTo determine the limiting reagent, we need to calculate the amount of product that each reactant can produce.

According to the balanced equation, 2 moles of salicylic acid produces 2 moles of aspirin, while 1 mole of acetic anhydride produces 2 moles of aspirin. Therefore, the amount of aspirin that can be produced from each reactant is as follows : Amount of aspirin produced from salicylic acid = 2 x 0.0145 mol = 0.0290 molAmount of aspirin produced from acetic anhydride = 2 x 0.0196 mol = 0.0392 molSince salicylic acid can produce only 0.0290 mol of aspirin, it is the limiting reagent. This means that acetic anhydride is in excess. To determine how much of the excess reactant is used, we need to subtract the amount of acetic anhydride used from the amount that was initially present. The amount of acetic anhydride used is equal to the amount of salicylic acid used, which is 0.0145 mol.

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Answer:

75% will have long legs and 25% will have short legs

Explanation:

Answer:

c

Explanation:

Answer:

the answer of the question is C

Answer:

The acceleration of a moving object can be calculated by dividing the change in velocity by the change in TIME

Explanation:

Took the practice

Answer:

Model 2 and model 3

Explanation:

Both atomic models represent hydrogen, which consists of one proton in the nucleus. Both atomic models consists of 1 proton, which means that both their atomic numbers are equal to 1

The energy needed is the energy that changes. The electron in a hydrogen atom is initially assumed to be in the ground state with n=1. The energy of the electron in its ground state is therefore 13.6 eV.

As a result, 12.75eV of the energy is needed to transfer electrons from the ground state to the third excited state. The 4th and 5th ionisation the energies differ significantly from one another. The fourth electron is attracted to the nucleus atom considerably less strongly than the fifth electron because it is in an inner main shell that is closer to the nucleus.

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When atoms establish or break chemical bonds, chemical processes take place. Reactants are the chemicals that begin a chemical reaction, while products are the compounds that are created as a result of the reaction.

When a volcano erupts, glass, rock, and mineral particles are mixed together to form volcanic ash. Less than 2 millimetres in diameter, the particles are very tiny. They have a low density since they are frequently pitted and have numerous holes. In hydrated Portland cement, CSH is the primary factor in the development of strength, while calcium hydroxide is another hydration agent.

Silica granules generate non-explosive dusts when they are suspended in the atmosphere. To create silicates, silica can interact with other metallic elements and oxides. A silicon atom is covalently joined to two oxygen atoms to form silicon dioxide, a kind of silicon oxide composed of linear triatomic molecules.

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Answer:

noe  sory opwqkfj

s

Explanation:

If you were only given a chemical equation and reference tables, you could determine if a reaction was spontaneous or not by using the standard free energy change (∆G°) values listed in the tables.

The equation for determining ∆G° is:
∆G° = ∆H° - T∆S°
Where ∆H° is the enthalpy change, ∆S° is the entropy change, and T is the temperature in Kelvin.
If ∆G° is negative, the reaction is spontaneous (i.e. the products are more stable than the reactants) and if ∆G° is positive, the reaction is non-spontaneous (i.e. the reactants are more stable than the products).
By looking up the standard free energy change values for each compound in the chemical equation, you can calculate the overall standard free energy change for the reaction and determine if it is spontaneous or not.
It is important to note that these standard free energy change values only apply to standard conditions (i.e. 25°C, 1 atm pressure, 1 M concentration) and may not accurately reflect the actual conditions of a reaction. Additionally, other factors such as activation energy and reaction kinetics can also impact whether a reaction is spontaneous or not.

To determine if a reaction is spontaneous or not, using only a chemical equation and reference tables, you can follow these steps:
1. Identify the reactants and products in the given chemical equation.
2. Consult your reference tables to find the standard Gibbs free energy change (ΔG°) values for each reactant and product.
3. Calculate the overall standard Gibbs free energy change (ΔG°) for the reaction using the equation:
  ΔG°(reaction) = Σ ΔG°(products) - Σ ΔG°(reactants)
4. Analyze the calculated ΔG°(reaction) value:
  - If ΔG°(reaction) is negative, the reaction is spontaneous.
  - If ΔG°(reaction) is positive, the reaction is non-spontaneous.
  - If ΔG°(reaction) is equal to zero, the reaction is at equilibrium.
By following these steps and using the provided reference tables, you can determine if a given chemical equation represents a spontaneous reaction or not.

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Answer:

It will freeze or melt

Explanation:

Ice will melt if energy added

Water will freeze if energy removed

Answer: D. a mixture

Explanation: When you mix different types of nuts or snacks together including raisins, hazelnuts, almonds, and peanuts to make some kind of trail mix, then you are creating a mixture, specifically a heterogeneous mixture.

Answer:

387 g/mol

Explanation:

The molar mass is a ratio comparing a substance's mass and molar value. The specific ratio looks like this:

Molar Mass (g/mol) = mass (g) / moles

You can plug the given values into the ratio to find the molar mass.

Molar Mass = mass / moles

Molar Mass = 0.406 g / 0.00105 mol

Molar Mass = 387 g/mol

The % ee (enantiomeric excess) of the mixture can be calculated as 7.8%.

Enantiomeric excess (% ee) is a measure of the purity of a chiral compound or mixture, indicating the percentage of one enantiomer present in excess over the other. To calculate % ee, we need the observed rotation value and the specific rotation of the pure enantiomer. The formula for % ee is:

% ee = (observed rotation / specific rotation) × 100

The observed rotation is 0.78 and the specific rotation is not provided. However, if we assume a specific rotation of 1 (arbitrary units), we can calculate a relative % ee:

% ee = (0.78 / 1) × 100 = 78%

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Answer:

1.25 m

Explanation:

there are 100 cm in a metre. So to convert cm to m you divide the cm by 100

there are 1.25 meters in 125 cm

Answer:

Water cooled down and contracted.

Explanation:

When water contracts, its volume decreases. When the volume of the water in the bottle system decreases, the water is pulled farther down the clear pipe.

According to the ideal gas law, the relationship between the pressure, volume, and temperature of a gas is given by the equation PV = nRT, where P is the pressure of the gas, V is the volume of the gas, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature of the gas in Kelvin.

If we have 2.9 L of gas at a pressure of 5.0 atm and a temperature of 50.0 °C, we can calculate the temperature of the gas if we decrease the volume of the gas to 2.4 and decrease the pressure to 3.0 atm by rearranging the ideal gas law equation as follows:

T = (PV) / (nR)

In this equation, T represents the temperature of the gas, P represents the pressure of the gas, V represents the volume of the gas, n represents the number of moles of gas, and R represents the ideal gas constant.

Plugging in the values from the problem into the equation, we get:

T = (5.0 atm * 2.9 L) / (n * 0.08206 L*atm / mol*K)

T = (14.5 L*atm) / (n * 0.08206 L*atm / mol*K)

T = (14.5 L*atm) / (n * 0.08206 L*atm / mol*K)

T = 177.2 K

Therefore, if we have 2.9 L of gas at a pressure of 5.0 atm and a temperature of 50.0 °C, and we decrease the volume of the gas to 2.4 and decrease the pressure to 3.0 atm, the temperature of the gas will be 177.2 K.

Answer:

to find the number of electrons an element has locate it on the periodic table of elements find the atomic number and note the number of protons because they are naturally electrically neutral

Answer:

M-A=N

Explanation:

M-A=N

Here is an example.

The equation above means that the atomic number (A) subtracted from the average atomic mass (M) equals the combined amount of neutrons and protons. Since we know that 35 17Cl is Chlorine (this is because Chlorine (Cl) is the 17th number on the periodic table and has the average atomic mass of 35), we can insert our data into the equation and end up with the following:

35-17=18.

From here, we can tell that we have a mix of neutrons and protons, with the total being 18. Since the atomic number is 17, we can reasonably assume that there are 17 protons and 1 neutron.

But we still need to find the number of electrons. Fortunately, the number of electrons is always equivilant to the number of protons and the atomic mass, so we know that the number of electrons is 17.

So, we have;

17 Protons

1 Neutron

17 Electrons

Answer: Water molecules from the dilute to the concentrated solution

Explanation:

During Osmosis if a solution is separerated by a semipermeable membrane, the solvent (typically water) from the less concentrated solution in terms of solute goes through the semipermeable membrane to the solution with the higher concentration so that the concentrations between the solutions can be balanced.

With the above solutions therefore, water molecules would move from the solution of 0.4M of sugar to the solution with a 0.7M of sugar through the semipermeable membrane.

During osmosis, water molecules move from the dilute to the concentrated solution.

OSMOSIS:

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Before performing the titration of the unknown acid, if the partner accidentally dilutes the sample by adding water, it would affect the following aspects of the titration curve:

1. The volume of base necessary to reach the equivalence point will remain unaffected.

2. It would not have any effect on the pH at the half-equivalence point.

3. It would decrease the pH at the equivalence point.

Titration is a process in which a solution of known concentration (the titrant) is added to a solution of unknown concentration (the analyte) until the reaction between them is complete. When this reaction is complete, it is known as the equivalence point, and it is indicated by the titration curve.

The accidental dilution of the unknown acid by adding water to it before titration would affect only the pH at the equivalence point. Here's how:

Effect on volume of base used: The volume of base required to reach the equivalence point remain unaffected or unchanged as volume of base depends upon number of moles of acid. Here, dilution doesn't affects the number of moles, it is affecting the concentration of solution. That's why it doesn't matter that how much diluted a sample is, the thing matters is the number of moles of acid which are not changing.

Effect on pH at the half-equivalence point: It would not have any effect on the pH at the half-equivalence point. The pH at the half-equivalence point depends only on the dissociation constant (Ka) of the acid. It is also not affected by concentration of acid.

Effect on pH at the equivalence point: As the sample is diluted by adding water, the concentration of the acid decreases, and the amount of H+ ions released by it also decreases. Therefore, it would require fewer hydroxide ions (OH-) to neutralize the acid, which means that the pH of the equivalence point would decrease.

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Answer:

Radiant energy to chemical energy

Explanation:

Got it right on edge 2021

One energy transformation that is taking place in the photosynthesis process is radiant energy to chemical energy.

Energy transformation is the process in which one form of energy converted into another form of energy.

Photosynthesis process is defined as the process in which plants makes their own food by using the carbon dioxide, water and sunlight in the chlorophyll.

The balanced chemical equation of photosynthesis process is

6CO2 + 6H2O → C6H12O6 + 6O2.

Since, it have 6 atoms of carbon, 12 atoms of hydrogen and 18 atoms of oxygen on both side. So, it is balanced.

Since, sunlight which it take is in the form of radiant and convert it into chemical energy.

Thus, we concluded that the energy transformation that is taking place in the photosynthesis process is radiant energy to chemical energy.

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The amount of work done is 450.0 atm L given that a system is compressed from 50.0 L to 5.0 L at a constant pressure of 10.0 atm.

To find the amount of work done when a system is compressed from 50.0 L to 5.0 L at a constant pressure of 10.0 atm, we can use the equation:

Work = Pressure x Change in Volume

The change in volume is calculated by subtracting the initial volume from the final volume:

Change in Volume = Final Volume - Initial Volume
Change in Volume = 5.0 L - 50.0 L
Change in Volume = -45.0 L

Since the change in volume is negative (indicating compression), we can use the absolute value of the change in volume in the calculation.

Plugging in the values into the equation, we have:

Work = 10.0 atm x |-45.0 L|
Work = 10.0 atm x 45.0 L
Work = 450.0 atm L

Therefore, the amount of work done is 450.0 atm L

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Answer:

quartz (SiO2)n

Explanation:

Melting point is defined as the temperature or point at which the substances change its state from solid to liquid.

Quartz (SiO2)n has high melting point than O2 because Quartz (SiO2)n is found in the form of hard, crystalline mineral that is made up of silicon and oxygen atoms having strong covalent bonds between all the atoms. So, a lot of energy is required to break the bond between the atoms and it has a high melting point.

Hence, the correct answer is quartz (SiO2)n.