80g of calcium reacts with water to form 114g of calcium hydroxide and 2g of
hydrogen.
2 Ca + 2 H0+2CaOH + H,
What mass of water was used in this reaction?​

The gas laws are a set of fundamental principles that describe the behavior of gases under different conditions of pressure, volume, and temperature. We can use the ideal gas law to solve this problem:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.

First, we need to convert the temperature from Celsius to Kelvin by adding 273.15:

T = 0.00 C + 273.15 = 273.15 K

Next, we can plug in the values we have:

P(22.4 L) = (1.00 mol)(0.0821 L·atm/mol·K)(273.15 K)

Simplifying:

P = (1.00 mol)(0.0821 L·atm/mol·K)(273.15 K)/(22.4 L)

P = 1.01 atm

Therefore, the helium will exert a pressure of 1.01 atm on its container.

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Answer:

A not

B yes

C yes

D yes

Explanation:

A 2C 6H but 10O and 7O so no

B 3C 6O 2Fe on each side  so yes

C 4H 1S 6O 2Na so yes

D 2Ag 2Cl 1Ca 2N 6O so yes

The temperature of the CO₂ in your Erlenmeyer is 298.95 Kelvin.

The Kelvin temperature scale is an absolute temperature scale, where 0 Kelvin is the lowest possible temperature, also known as absolute zero. The Celsius temperature scale is a metric temperature scale commonly used in everyday life.

To convert Celsius to Kelvin, we simply add 273.15 to the Celsius temperature. So for the given temperature of 25.80°C, we can convert it to Kelvin using the following formula:

Temperature in Kelvin = Temperature in Celsius + 273.15

Temperature in Kelvin = 25.80 + 273.15

Temperature in Kelvin = 298.95

Therefore, the temperature of CO₂ in the Erlenmeyer flask is 298.95 K.

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The reaction between pottasium metal and chlorine gas is an example of combination reaction and the balanced equation is as follows: 2K + Cl₂ → 2KCl

A chemical equation is a symbolic representation of a chemical reaction where reactants are represented on the left, and products on the right.

A chemical equation is said to be balanced when the number of atoms of each element on both sides of the equation are the same.

According to this question, potassium metal reacts with chlorine gas to form solid potassium chloride. The balanced equation is as follows:

2K + Cl₂ → 2KCl

Based on the above equation, pottasium combines with chlorine chemically to form pottasium chloride compound, hence, it is an example of combination reaction.

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Answer: it has full valence shells

Explanation: Hope this is it

Answer:

Neon, along with helium, argon, krypton and xenon, make up the group known as noble gases. These are the most stable and least reactive elements due to having full valence shells (the outer shell has the max number of electrons, two for helium, eight for the rest).

Explanation:

Hope it helps

PlS MARK BRAINLIEST <3

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Tori

Answer:

the distance between the electron and nucleus

If you were making a dilution of a culture and placed 1 ml of the original stock culture into a 99 ml water blank, the resulting dilution factor would be 1/100

Calculation ,

volume of stock transferred ( Vi ) =  1 ml

Diluent volume = 99 ml

The dilution factor (DF) : ratio of concentration of stock solution and diluted solution or ratio of the volume of final solution to the initial volume from stock solution

From equation of dilution :

M₁V₁=M₂V₂

Dilution factor = volume of stock transferred ( Vi ) / Final volume ( Vf )

The Final volume ( Vf ) = Diluent volume + stock volume

After putting the value of all given term in above equation we get the value of dilution factor .

Dilution factor = 1 ml / 1+ 99 = 1 / 100

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Electron(s) are lost during oxidation, and the oxidation state is raised.

While reduction includes the acquisition of electrons, oxidation entails the loss of electrons.

This is in line with how oxidation and reduction are defined.

Redox reaction refers to any process in which oxidation and reduction take place simultaneously. When reactants are transformed into products in an oxidation-reduction (redox) reaction, electrons are transferred from one element to another. The change in oxidation values from the reactant side to the product side indicates the transfer of electrons.

As a result, choice D is the right response.

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An sample of coal is assayed for its sulfur content. If a 5.57 g sample of coal contains 0.028 g of sulfur. The percent sulfur in the ore is 0.5023%.

To calculate the percentage of sulfur in the coal sample, we need to divide the mass of sulfur by the mass of the coal sample and multiply by 100 to get the result as a percentage.

Mass of sulfur = 0.028 g

Mass of coal sample = 5.57 g

Percent sulfur = (mass of sulfur / mass of coal sample) x 100

Percent sulfur = (0.028 g / 5.57 g) x 100

Percent sulfur = 0.502 % (rounded to three significant figures)

Therefore, the percent sulfur in the coal sample is 0.5023 %.

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Answer:

pH = - log [H3O+]     pOH = -log[OH-]

Explanation:

Answer:

linear

Explanation:

.....................…...…

Explanation:

bent with an H-0-H angle if 104.5°

Explanation:

The student most likely observed both (A) Vacuole and (C) Chloroplast that led him to the conclusion, that the cell is a plan cell.

Reason :

In a plant cell, Vacuole occupies 70% to 90% of the total volume of the cell, making it easier to identify.

Chloroplast contains photosynthetic pigment called chlorophyll (green in colour), which is only found in plant cell.

Answer:

Explain that unlike sound, light waves travel fastest through a vacuum and air, and slower through other materials such as glass or water.

Explanation:

Hope this helped.

Answer:

empty space

Explanation:

The percent yield of the reaction with formation of lead oxide  is 70.29%.

Percent yield is defined as the ratio of actual yield to the theoretical yield multiplied by 100. If the actual and theoretical yield are same then the percent yield is 100%.If actual yield is less than the theoretical yield then the percent yield is less than 100%.Reason of this condition arising is the incompletion of reaction or loss of sample during recovery process.

In cases where percent yield is over 100% it indicates that more sample is recovered than the predicted amount.This condition arises when there are other simultaneous reactions taking place leading to the formation of product. It can also arise if there is incomplete removal of impurities from the sample .

In the given problem, 2 moles of lead produce 2 moles of lead oxide

That is, 414.4 g lead produces 446.4 g of lead oxide

hence,451.54 g lead will produce 451.4×446.4/414.4=486.251 g which is the theoretical yield

Now by substituting the values in the formula,341.8/486.251 ×100=70.29%

Hence, the percent yield of the reaction is 70.29%.

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The following which is not a part of  Dalton atomic theory is the properties of atoms of the same elements can be different . Thus option B is correct.

Dalton has proposed his theory in three parts and each part stated that

The first portion of his theory asserts that all stuff is made up of indivisible atoms.

According to the second section of the theory, all atoms of a given element have the same mass and characteristics.

Compounds, according to the third section, are combinations of two or more different types of atoms.

Dalton has given three laws

Thus, the following which is not a part of  Dalton atomic theory is the properties of atoms of the same elements can be different . Thus option B is correct.

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Your question is incomplete, but your complete question was

which of the following is not a part of the ideas john dalton proposed in his model

A. All matter is composed of indivisible atoms.

B. The properties of atoms of the same element can be different.

C. Compounds form when atoms combine in whole number ratios.

D. An atom can neither be created nor destroyed.

As her drink got warmer, she noticed that there were fewer bubbles in it because as temperature increases, pressure also increases and vice versa.

Using a derivative of the combined gas law we can explain that is happening in both the cases.

Assuming that volume is constant which is predicated on the bottle shape and structure, pressure of a given mass of gas varies directly with  absolute temperature.

As temperature increases, pressure also increases and vice versa. The bottle at a higher temperature has a higher pressure of gas and the bottle at lesser temperature has a reduced pressure inside.

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The measurable difference in charges of atoms is known as electronegativity.

Electronegativity is the measure of the capability of an atom in a molecule to pull electrons toward itself. In general, this measure increases from left to right across a period and decreases down a group of the periodic table.

Electronegativity usually increases with increasing atomic number and decreases with increasing distance from the nucleus of an atom.

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Moles of Na_2O

2 mols Na_2O produces 1 mol sodium carbonate.

1 mol sodium oxide produces 0.5mol sodium carbonate

Moles of sodium carbonate

Molar mass

Mass

Answer:

The frequency of blue light with a wavelength of 475 nm is 6.26 x 10^14 Hz.

We can see here that the amount of profit he make is: $22.20

Profit is the financial gain or benefit that is achieved when the revenue from selling goods or services exceeds the total costs incurred in producing or providing them.

To calculate Emilio's profit, we need to subtract the total cost of making the potholders from the total revenue generated by selling them.

Total cost of making potholders = Cost per potholder × Number of potholders

Total cost = $2.82 × 60 = $169.20

Total revenue from selling potholders = Selling price per potholder × Number of potholders

Total revenue = $3.19 × 60 = $191.40

Profit = Total revenue - Total cost

Profit = $191.40 - $169.20 = $22.20

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Answer:O B. Weak acid breaks down minerals by reacting with them.

Explanation:

Chemical weathering is the process whereby rain water which sometimes can be acidic ( As rain falls down it reacts with CO2 in the atmosphere and form acid rain), This  reacts  with the minerals contained in rocks, dissolves and degrades  them further to form entire  new minerals.

An example of a rock that is greatly affected by overexposure of  acid rain is  limestone containing calcite  which easily degrades by acid rain.

Other processes whereby Chemical weathering can occur are through reaction with water and oxygen.

It is False to state that an Absolute brightness scale is called apparent magnitude.

The brightness of a star as seen from Earth is described by apparent magnitude.  It is determined by the size of the star and its distance from Earth.  On a scale of (-26.8 to +29), Negative values are low in bright stars. The Sun (apparent magnitude -26.8) is the brightest star in the sky.

The absolute magnitude scale is the same as the apparent magnitude scale, with a difference in brightness of 1 magnitude = 2.512 times. This logarithmic scale is likewise unitless and open-ended. Again, the brighter the star, the lower or more negative the value of M.

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Full Question:

An Absolute brightness scale is called apparent magnitude.
True or False?

Answer:

12ml per hour and

69% LOL

1) The rate of percolation would be 0.33 ml/s

Percolation rate = volume of water/time

                             =  600/1800s

                              = 0.33 ml/s

2) The percentage of water absorbed would be 40%

Percentage of water absorbed = amount absorbed/total water x 100

                 amount of water absorbed = 100 - 60

                                                      = 40 ml

                  total amount of water = 100 ml

   Percentage of water absorbed = 40/100 x 100

                                                       = 40%

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If the reaction is of the first order, the temperature at which its half-life period be 10 minutes is 2893 K.

For first-order reactions, the half-life is related to the rate constant k as follows:

t1/2 = 0.693 / k

So, the rate constant k can be calculated as

k = 0.693 / t1/2

Substitute the values of t1/2 = 10 minutes in the above equation, we get;

k = 0.693 / 10 minutes = 0.0693 / min

Now, we can calculate the rate constant, k using Arrhenius equation:

k = A exp(-Ea/RT)

where, R is the gas constant = 8.31 J/molK and T is the temperature in Kelvin (K).

First, convert the activation energy into joules/mol by multiplying it with 1000: Ea = 98.6 kJ/mol × 1000 J/kJ = 98600 J/mol.

Substitute the values of k, A, and Ea in the Arrhenius equation, we get:

0.0693 / min = 4 × 10¹³ sec⁻¹exp(-98600 J/mol / (8.31 J/molK T))

Simplify the above equation by taking the natural log of both sides and rearrange to isolate the temperature, we get:

ln(0.0693) - ln(60) = ln(4 × 10¹³) - 98600 / (8.31 × T)

ln(0.0693) - ln(60) - ln(4 × 10¹³) = - 98600 / (8.31 × T)

ln(0.0693 × 60 × 4 × 10¹³) = - 98600 / (8.31 × T)

T = - 98600 / (8.31 × ln(0.0693 × 60 × 4 × 10¹³))

T = 2893 K

Therefore, the temperature at which the half-life period is 10 minutes is 2893 K.

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The chemoheterotroph Proteus vulgaris is a rod-shaped bacterium that is classified with Enterobacteriaceae.

Proteus vulgaris is a Gram-negative bacterium that is rod-shaped and facultative anaerobic in nature. The bacterium is known for its natural capacity to swarm, which means it can easily move through solid or semi-solid surfaces, including media. It has been identified as a chemoheterotroph.

                                    Enterobacteriaceae is a family of Gram-negative, non-spore-forming bacilli. Proteus vulgaris is one of the members of this family, as well as some other genera such as Escherichia coli, Salmonella, Shigella, and many others. All members of the Enterobacteriaceae family are aerobic or facultatively anaerobic, and most are motile and have peritrichous flagella.

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Condensed structural formulas are written in a single line to save space and make them easier and faster to type out. They display the atoms' positions similarly to a structural formula.

The only amino acid that has one carbon atom is glycine. \($-\mathrm{COOH}$\) plus one \($-\mathrm{NH}_2$\) group that is connected to an alpha-carbon and contains two hydrogens. - \($\mathrm{COOH}$\) Serine is made up of an a-carbon, one hydrogen, and one \($-\mathrm{NH}_2$\) group as well as one  \($-\mathrm{CH}_2 \mathrm{OH}$\)group.

Both glycylserine and serylglycine are dipeptide molecules made up of glycine and serine; however, glycylserine has an amide linkage formed when one H of the \($-\mathrm{NH}_2$\) group of glycine condenses with the - \($\mathrm{OH}$\) of the - \($\mathrm{COOH}$\) group of glycine Comparably, in serylglycine, one  -OH of the - \($\mathrm{COOH}$\) group of serine condenses with one H of the \($-\mathrm{NH}_2$\) group of serine. Serine and glycine are the two byproducts of the hydrolysis of serylglycine. The rupture of the amide bond is seen by the red line. The glycine, serine, and alanine amino acids that make up this tripeptide structure are connected by amide bonds.

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Hydrogen bonds between the oxygen and hydrogen atoms of the amide groups have been found to stabilize a polypeptide's folded shape.

A polypeptide is a long chain of amino acids linked by peptide bonds. The folded shape of a polypeptide is important for its function and is stabilized by various types of interactions, including hydrogen bonds. Hydrogen bonds are weak electrostatic interactions between the partial positive charge of a hydrogen atom and the partial negative charge of another atom, usually oxygen or nitrogen.

In a polypeptide, hydrogen bonds can form between the oxygen atom of the carbonyl group in one amino acid and the hydrogen atom of the amide group in another amino acid. These hydrogen bonds help to stabilize the folded shape of the polypeptide by holding the chain in a specific conformation.

Overall, hydrogen bonds between the oxygen and hydrogen atoms of the amide groups are important for the stability of a polypeptide's folded shape.

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Answer:

Mass of product formed =  7.49 g

Explanation:

According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.

This law was given by French chemist  Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.

For example:

In given photosynthesis reaction:

6CO₂ + 6H₂O + energy → C₆H₁₂O₆ + 6O₂

there are six carbon atoms, eighteen oxygen atoms and twelve hydrogen atoms on the both side of equation so this reaction followed the law of conservation of mass.

In given question it is stated that the amount of reactant A is 7.54 g and the amount of reactant B is 6.55 g so it means total amount of reactant is

A + B    =   14.09 g

It is also given that after the completion of reaction the amount of reactant A left is 3.82 g and amount of B left is 2.78 g.

Thus total amount left is 2.78g + 3.82g = 6.6 g

Mass of product formed = total amount of reactant - amount left

Mass of product formed =  14.09 g - 6.6 g

Mass of product formed =  7.49 g

The percent composition of water  in compound calcium sulfate dihydrate is 20.90%.

Percent composition is defined as a convenient way to record concentration of solution.It is a expression which relates a particular element to compound as,mass of element/mass of compound ×100.There are two types of percentage compositions percent weight by volume and percent volume by volume .

In the given example the weight of water=36 g and that of  calcium sulfate dihydrate  calcium sulfate dihydrate =172.17 g

∴percent composition of water in  calcium sulfate dihydrate =36/172.17×100=20.90%.

Thus, the  percentage composition of water in CaSO₄.2 H₂O is 20.90%.

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