What is the lewis structure of lithium fluoride?​

Answer:

The value of x in the hydrocarbon formula CxHy is 1.

Explanation:

Here's how to arrive at the solution:

Since the relative atomic mass of carbon is 12 and the hydrocarbon contains 9g of carbon, we know that there are 9/12 = 0.75 moles of carbon in the hydrocarbon.

Since the hydrocarbon only contains hydrogen and carbon, the remaining mass (12g - 9g = 3g) must be due to hydrogen.

To find the number of moles of hydrogen, we need to convert the mass of hydrogen to moles. The relative atomic mass of hydrogen is 1, so the number of moles of hydrogen is 3/1 = 3 moles.

Therefore, the ratio of carbon to hydrogen in the hydrocarbon is 0.75 moles of carbon to 3 moles of hydrogen, which simplifies to 1:4.

The general formula for the hydrocarbon can be written as CxHy. Since the ratio of carbon to hydrogen is 1:4, we know that x = 1 and y = 4. Thanks.

0.1875grams/cm3 is the density of the cube below if

the mass is 45g7.

A material substance's density is its mass per unit volume. D is density, M is mass, and V is volume, therefore the formula for density is d = M/V. In terms of grammes per cubic centimeter, density is frequently expressed. As an illustration, the density of water is 1 g/cc, whereas the density of the Earth is 5.51 g/cc.

As kilos per cubic metre, density can also be calculated (in metre-kilogram-second or SI units). As an illustration, air has a density of 1.2 kilograms per cubic metre. Textbooks and manuals contain lists of the densities of common solids, liquids, and gases. The mass of a body can be calculated from its volume using density, and vice versa. The mass is equal to the volume multiplied by the density (M = Vd), whereas the volume is equal to the mass divided by the density (V = M/d). You may calculate a body's weight by multiplying its mass by the acceleration of gravity, which is typically of more practical significance than its mass.

Derive the mass and volume of this sugar cube

Mass = 45 grams

sides are h=16m

                L=5cm

               W=3cm

ρ = m/V

ρ = density, kg/m3, or g/(cm)3

m = mass, in kg or g

V = volume, in m3 or (cm)3

Here, ρ = density, m = mass, and v = volume.

ρ = 45/16×5×3

Density of the cube is 0.1875grams/cm3

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By -320 pM, we need to increase the source power. A fluorescent material begins to produce visible light when energy is absorbed as a result of the incidence of X-rays, light waves, and electrons.

When a substance generates electromagnetic waves inside the longer wavelength range and makes them visible to the human eye, it is a fascinating occurrence. Let's first define fluorescence in order to comprehend this. This allows the substance to gently transition from the partly excited state to the ground state. Fluorescence is the term for this phenomena.

Detection limit = 3 × noise / signal to noise ratio

Detection limit  = 3× 75 pM / 5 = 15 pM

Source power = (noise / desired detection limit)² × current source power

Source power = (15 pM / 75 pM)² ×500 pM

                      = 0.36 ×500 pM

                       = 180 pM

Source power= 180 pM - 500 pM =

                       =-320 pM

Therefore, -320 pM, we need to increase the source power.

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The partial pressure of NO that would give a solubility of 0.060 M is 0.533 atm.

The solubility of a gas in a liquid is directly proportional to its partial pressure above the liquid. This relationship is described by Henry's law:

C = kP

Where C is the concentration (in units of molarity), P is the partial pressure of the gas (in units of atm), and k is the proportionality constant known as Henry's law constant (in units of M/atm).

To solve the problem, we can use the given information to calculate the value of k and then use it to determine the partial pressure that would give a solubility of 0.060 M.

Using the given data, we have:

C = 0.090 M

P = 0.80 atm

Substituting these values into Henry's law equation gives:

0.090 M = k(0.80 atm)

Solving for k, we get:

k = 0.090 M / 0.80 atm

k = 0.1125 M/atm

Now we can use this value of k to determine the partial pressure that would give a solubility of 0.060 M. We have:

C = 0.060 M

k = 0.1125 M/atm

Substituting these values into Henry's law equation gives:

0.060 M = (0.1125 M/atm)P

Solving for P, we get:

P = (0.060 M) / (0.1125 M/atm)

P = 0.533 atm

Therefore, the partial pressure of NO that would give a solubility of 0.060 M is 0.533 atm.

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Answer:chemical formula of acetic acid is  or

so, molecular mass of acetic acid = 2 × atomic mass of C + 4 × atomic mass of H + 2 × atomic mass of O

= 2 × 12 + 4 × 1 + 2 × 16

= 24 + 4 + 32

= 60g/mol

given mass of acetic acid = 22g

so, no of moles of acetic acid = given mass/molecular mass

= 22/60 ≈ 0.367

so, number of moles of acetic acid is 0.367mol

number of molecules in 0.367 mol of acetic acid = 6.022 × 10²³ × 0.367

= 2.21 × 10²³

Explanation:

All three titrations require the same volume of NaOH to reach the first equivalence point.

The type of acid used in the titration determines the pH of the result: a strong acid results in a pH of 7 at the titration's equivalent. Equivalence point for a weak acid is influenced by the type of conjugate base and weak acid's beginning pH. The type of the acid is another factor for a diprotic acid.

Thus:

The initial pH of all three titrations is the same, as is the pH at the first equivalence point in all three titrations. Moreover, the final pH of all three titrations is the same. of the three are FALSE.

Thus:

To reach the first equivalence point, all three titrations need the same volume of NaOH.

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If HA is the weak acid, HB is the strong acid, and H₂C is a diprotic acid, the statement is true for the titrations is All three titrations require the same volume of NaOH to reach the first equivalence point.

The pH of the titration is depend on the nature of acid. here the the HA is the weak acid and the HB is the strong acid. the  H₂C is the diprotic acid. the diprotic acid means the acid which contains the two hydrogen atoms and will ionized in the water.

Thus, the from all the statements the true one is that All three titrations require the same volume of NaOH to reach the first equivalence point.

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If more energy is absorbed than what is released during bond breaking and forming, the reaction is endothermic.

When bonds in the reactants are broken in endothermic reactions, greater energy is absorbed than emitted when new bonds are created in the products.

The energy required to break existing bonds in endothermic processes is more than the energy released when new bonds are generated. In an exothermic process, more energy is generated when new bonds are created than is consumed when old ones are broken.

If more energy is absorbed than what is released during bond breaking and forming, the reaction is endothermic.

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Answer:

C

Explanation:

The statement that explains whether NaCl or BeO will have a stronger bond is D. BeO will have a stronger bond because it has a smaller ionic charge, and a smaller distance between ions

A chemical bond simply means the attraction between ions, atoms, or molecules which then leads to the formation of chemical compounds.

It should be noted that Beryllium oxide with the chemical formula BeO has a stronger bond than Sodium Chloride due to the fact that it has a smaller ionic charge, and a smaller distance between ions

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Answer:

True

Explanation:

yes magnetic feild lines is always combined

Answer:

Voltage is the measure of electric potential energy per unit charge, current is the flow of electric charge through a circuit, and resistance is the property of a material that opposes the flow of electric current.

Ohm's Law relates these three concepts by stating that current is directly proportional to voltage and inversely proportional to resistance.

Hope this helps!

The freezing point of the aqueous solution with 0.022m glucose is - 0.0210°C. The boiling point of glucose solution is 101.79∘C.

The amount of solute added to the solvent will, however, determine how much either the boiling point or the freezing point rises or falls. Calculating the freezing point depression or the boiling point elevation requires a mathematical equation. A solvent's freezing point actually drops as its boiling point rises. An illustration of this would be to sprinkle salt on an icy sidewalk. The solute (salt) lowers the ice's freezing point, enabling the ice to melt at a lower temperature. ​

The freezing point depression can be calculated by the following formula:

\(T_{f} - T_{0} =\) -i × m  × kf

The freezing point of pure water is 0 °C van't Hoff factor for glucose is 1,

the molality is computed as shown below

and the freezing point constant of water is 1.86 °C/m:

m =(0.022m glucose × 1m of glucose/ 180 gm of glucose)/ 100g  × 1kg/1000g = 0.0113m

\(T_{f}\) = 0°C - 1 × 0.0113 × 1.86° \(\frac{C}{m}\)

\(T_{f}\) = - 0.0210°C

The boiling point of glucose solution = 100°C + 1.79°C = 101.79°C.

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Answer:

Store the genetic instructions needed to specify traits.

In DNA, the primary function of chromosome is store the genetic instructions needed to specify traits.

DNA is a hereditary material  which is present in human beings as well as all other living organisms.  Every cell which is present in an organism's body has DNA  which is the same. Most of the DNA is situated in the cell's nucleus and small amount of it can be found in the cell's mitochondria as well.

Information which is stored in DNA is stored as codes made up of four chemical bases namely, adenine, thymine , cytosine and guanine.Human DNA consists of 3 billion bases .The order of the bases determines information which is required for building and maintaining an organism.

DNA bases are capable of pairing up with each other. Adenine pairs with thymine and guanine pairs up with cytosine .Each base is also attached to a sugar molecule  and a phosphate group. A base, phosphate  sugar are together called as nucleotides.

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Answer:

false

Explanation:

Denitrifying bacteria and nitrogen-fixing bacteria perform opposite processes in the nitrogen cycle. Nitrogen-fixing bacteria convert atmospheric nitrogen into usable forms such as ammonia, while denitrifying bacteria convert nitrates in the soil back into atmospheric nitrogen

To calculate the molarity of the sodium hydroxide (NaOH) solution, we need to perform a titration with a standardized solution of hydrochloric acid (HCl). Here is the numerical setup for calculating the molarity of the NaOH solution:

Measure the volume of the HCl solution used in the titration. Let's say you used 25.0 mL of 0.100 M HCl.

Calculate the number of moles of HCl used in the titration: moles of HCl = M x V = 0.100 mol/L x 0.0250 L = 0.00250 mol.

Use the balanced chemical equation for the reaction between HCl and NaOH to determine the number of moles of NaOH that reacted with the HCl. The balanced chemical equation is:

HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l)

Since the stoichiometry of the reaction is 1:1 between HCl and NaOH, the number of moles of NaOH that reacted is also 0.00250 mol.

4. Determine the volume of NaOH used in the titration. Let's say you used 30.0 mL of NaOH solution.

Calculate the molarity of the NaOH solution: Molarity of NaOH = moles of NaOH / volume of NaOH solution (in L) = 0.00250 mol / 0.0300 L = 0.0833 mol/L.

To determine the total volume of HCl(aq) and NaOH(aq) used in the titration, simply add together the volumes of HCl and NaOH that were used. In this example, the total volume would be 25.0 mL + 30.0 mL = 55.0 mL.

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On Earth he weighs 720 newtons. 36N is the weight. Therefore, the correct option is option D among all the given options.

The gravitational force of attraction exerted on an item by the presence of a huge second object, including the Earth or Moon. Weight is a result of the fundamental law of gravitation: whatever two things have the same weight.

They attract each other using a force that really is directly related to the sum of their masses as well as inversely related to the square of something like the distance separating them due to their masses.

F = mass ×4/9g

  = 720 ×4/9

  =36N

Therefore, the correct option is option D.

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The marshmallow's dark spots occasionally have a tendency to come off. This implies that the system does not have to take the pieces that fell into account when calculating the mass before and after.

Explain your response using chemistry. The marshmallow's sugar matrix and air bubbles help keep the gelatin inside the marshmallow in check. The air bubbles in the marshmallow burst, allowing the gelatin to move freely, when heat or moisture is added.

A regular marshmallow has air, corn syrup, sugar, and gelatin. All done. Richard Hartel, a food engineer at the University of Wisconsin-Madison, claims that a marshmallow is essentially a foam that has gelatin added to solidify it. in the froth on marshmallows is comprised of air that has been suspended in a sugary liquid.

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The process of catalysis  which involves adding a catalyst  to a chemical reaction, increases the rate of the reaction.

Thus, Catalysts are not destroyed during the reaction and are unaffected by it. Very tiny amounts of catalyst are frequently sufficient when the reaction is swift and the catalyst recycles quickly; mixing, surface area, and temperature are key factors in reaction rate.

In order to regenerate the catalyst, it usually reacts with one or more reactants to produce intermediates that then give off the ultimate reaction product.

Homogeneous catalysis, in which all of the components are dispersed in the same phase as the reactant (often a gas or liquid), and heterogeneous catalysis, in which the components are not.

Thus, The process of catalysis  which involves adding a catalyst  to a chemical reaction, increases the rate of the reaction.

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The student's method for preparing pure crystals of copper sulfate contains errors and does not produce the desired outcome.

Use copper oxide instead of calcium carbonate: The student should add copper oxide (CuO) to the hydrochloric acid instead of calcium carbonate. Copper oxide reacts with hydrochloric acid to form copper chloride, which can then be converted to copper sulfate through a subsequent reaction with sulfuric acid.

Add sulfuric acid to the copper chloride solution: After the copper chloride solution is formed, the student should add sulfuric acid to it. This reaction between copper chloride and sulfuric acid will yield copper sulfate and hydrochloric acid. The student should ensure that the correct stoichiometric ratio is maintained to maximize the yield of copper sulfate crystals.

Crystal formation: The student should allow the solution to cool slowly after the reaction with sulfuric acid. This promotes the formation of larger, well-defined copper sulfate crystals.

Filtration and drying: Once the crystals have formed, the student should filter the solution to separate the solid crystals from the remaining liquid. The filtered crystals should then be thoroughly dried to remove any remaining water, resulting in pure copper sulfate crystals.

By following these improvements, the student can obtain pure crystals of copper sulfate.

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The amount of carbon dioxide produced by the reaction of 8 grams of oxygen with an excess of carbon monoxide is 16 grams.

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Based on the mole ratio, the maximum number of grams of NO that can be produced is 19.4 g.

The maximum number of grams of NO that can be produced is calculated from the equation of the reaction as follows:

Equation of the reaction: 4 NH₃ (g) + 5 O₂ (g) → 4 NO (g) + 6 H₂O(l)

Mole ratio of NH₃ and O₂₂is 4 : 5

moles of NH₃ = 15.9 / 17.03

moles of NH₃ = 0.9336 moles

moles of O₂ = 25.9 / 32

moles of NH₃ = 0.809 moles

the limiting reactant is O₂

Mass of NO produced = 0.809 * 4/5 * 30

Mass of NO produced = 19.4 g

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Answer:

sorry wala din akong sagot niyan sorry talaga

Answer:

118.06 mL

Explanation:

The neutralization reaction between HBr (acid) and Ba(OH)₂ (base) is the following:

2HBr + Ba(OH)₂ → BaBr₂ + 2H₂O

According to the equation, 2 moles of HBr react with 1 mol Ba(OH)₂. Thus, at the equivalence point the moles of acid and base react completely:

2 moles HBr = 1 mol Ba(OH)₂

We can replace the moles by the product of the molar concentration (M) and volume (V):

2 x (M HBr) x (V HBr) = M Ba(OH)₂ x V Ba(OH)₂

Now, we introduce the data in the equation to calculate the volume in mL of Ba(OH)₂:

V Ba(OH)₂ = (2 x (M HBr) x (V HBr))/M Ba(OH)₂

                 = (2 x 0.311 M x 57.7 mL)/(0.304 M)

                 = 118.06 mL

Therefore, 118 mL of Ba(OH)₂ are needed.

Answer:

A cold front is moving to the north and west before a warm front moves through.

Explanation:

The blue line indicated a cold front and the red line indicates a warm front. Both lines are moving up (north) and to the left (west) on the globe. Key words are north and west, which indicates the direction of which the fronts are moving even if it is unclear of which front is before the other.

Answer:

i think it is b

Explanation:

if not right i sry

Answer:

B

Explanation:

The fact that the infrared thermometers used in medical research were first intended to detect the temperature on Mars has had an impact on that field of study.

Technology for use in outer space, in aviation or other operations outside of Earth's atmosphere, for things like spaceflight, space exploration, and Earth observation, is referred to as space technology.

By enabling high-speed data transport with the development of the internet, enabling research of global natural phenomena, and enabling environmental monitoring, space technology started to be employed for telecommunications and the environment.

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When the 0.500 M silver nitrate solution is added to the 1.50 g mixture of sodium nitrate and sodium chloride in water, a reaction occurs.

When the 0.500 M silver nitrate solution is added to the mixture of sodium nitrate and sodium chloride, the following reaction takes place:

NaNO₃(aq) + AgNO₃(aq) → AgNO₃(s) + NaNO₃(aq)

NaCl(aq) + AgNO₃(aq) → AgCl(s) + NaNO₃(aq)

The solid produced is silver chloride (AgCl), which is a white precipitate.

At the atomic/molecular level, the following species would be seen:

To calculate the percent sodium chloride in the original unknown mixture, we need to know how much of the white solid we collected. Let's assume we collected 2.00 g of silver chloride.

We need to compute the number of moles of silver chloride produced:

2.00 g AgCl x (1 mol AgCl/143.32 g AgCl) = 0.01395 mol AgCl

Since silver nitrate is in excess, all the chloride ions in the original mixture will react with silver ions to form silver chloride. The number of moles of chloride ions in the original mixture is therefore equal to the number of moles of silver chloride produced:

0.01395 mol Cl- = 0.01395 mol NaCl

To calculate the percent sodium chloride in the original mixture, we need to know the total mass of the mixture:

1.50 g NaNO₃ + NaCl = 1.50 g

The percent sodium chloride is:

(0.01395 mol NaCl x 58.44 g/mol NaCl) / 1.50 g x 100% = 54.4% NaCl

Therefore, the original mixture was 54.4% sodium chloride and 45.6% sodium nitrate.

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The periodicity and patterns displayed by the earlier versions of the periodic table played a critical role in driving the discovery of new elements, and the periodic table remains an essential tool for organizing and understanding the properties of the known elements today.

The chemical elements are arranged in rows and columns in the periodic table, sometimes referred to as the periodic table of the elements.

The Russian chemist Dmitri Mendeleev's periodic table, which he developed in 1869 and which established the periodic law as the dependence of chemical properties on atomic mass, was the first to be widely acknowledged.

Mendeleev's periodic table had gaps because not all elements were known at the time; however, he was able to forecast some of the missing elements' properties using the periodic law.

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The partial pressure of hydrogen is 0.98 atm while the partial pressure of water is 0.02 atm. The total pressure of the system is 1 atm.

We have seen the reaction as it has been shown in the equation that is attached to the question above. Now, we must have to find the number of moles of the hydrogen that was obtained.

Number of moles of sodium =  1.90 g/23 g/mol = 0.08 moles

2 moles of sodium produces 1 mole of hydrogen

0.08 moles of sodium would produce 0.08 moles * 1 mole/ 2 moles

= 0.04 moles

Given that;

P = pressure

V = volume

n = Number of moles

R = gas constant

T = temperature

PV = nRT

P = nRT/V

P = 0.04 * 0.082 * 298/1

P = 0.98 atm

The partial pressure of the hydrogen = 0.98 atm

The partial pressure of the water = SVP of water at 18°C = 0.02 atm

Total pressure of the system =  0.98 atm +  0.02 atm = 1 atm

The system has a total pressure of 1 atm.

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Answer:

Explanation:

The number of atoms that remains after 3 half-lives given that it was originally 300000 atoms is 37500 atoms

Data obtained from the question

Original amount (N₀) = 300000 atoms

Number of half-lives (n) = 3

Amount remaining (N) =?

How to determine the amount remaining

The amount remaining after 3 half-lives can be obtained as illustrated below:

N = N₀ / 2ⁿ

N = 300000 / 2³

N = 300000 / 8

N = 37500 atoms