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Answer:

Sublimation is the process of transformation directly from the solid phase to the gaseous phase, without passing through an intermediate liquid phase. ... This is because the pressure of their triple point is very high and it is difficult to obtain them as liquids.

Approximately 1.91 grams of silver nitrate must be added to precipitate all of the phosphate ions in 45.0 mL of 0.250 M sodium phosphate solution.

To precipitate all of the phosphate ions in 45.0 mL of 0.250 M sodium phosphate solution, the mass of silver nitrate needed can be calculated using stoichiometry and the balanced chemical equation for the reaction between silver nitrate (AgNO₃) and sodium phosphate (Na₃PO₄).

The balanced equation for the reaction is:

3AgNO₃ + Na₃PO₄ -> Ag₃PO₄ + 3NaNO₃

From the equation, it can be seen that one mole of silver nitrate reacts with one mole of sodium phosphate to form one mole of silver phosphate.

First, calculate the number of moles of sodium phosphate in the given volume:

Moles of Na₃PO₄ = Volume (in liters) x Concentration (in M)

= 0.045 L x 0.250 mol/L

= 0.01125 mol

Since the stoichiometry of the reaction is 1:1 between silver nitrate and sodium phosphate, the number of moles of silver nitrate required is also 0.01125 mol.

Finally, calculate the mass of silver nitrate using its molar mass:

Mass = Moles x Molar mass

= 0.01125 mol x 169.87 g/mol (molar mass of AgNO₃)

= 1.91 g (rounded to two decimal places)

Hence, approximately 1.91 grams of silver nitrate must be added to precipitate all of the phosphate ions in the 45.0 mL of 0.250 M sodium phosphate solution.

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Answer:

The defect of vision suffered by the person is Myopia

Explanation:

The person can't see farther objects but is able to read a book which is placed closely to the eyes, using these observations the person is suffering from MYOPIA(nearsightedness) in which observer see close objects clearly but farther objects appear blurred.

The light entering the eye isn't correctly bent, the eyeball becomes big , or the eye lens become too converging, which converges the light ray in front of the cornea

This defect can be cured by using concave lenses.

Expressing this answer in scientific notation, the amount of N2 produced according to the engineer's design would be approximately 1.467 x 10^1 mol.

To determine the amount of N2 produced in the reaction between dinitrogen tetroxide (N2O4) and excess hydrazine (N2H4), we need to consider the stoichiometry of the reaction.

The balanced equation for the reaction is:

N2H4 + N2O4 → N2 + 2H2O

According to the stoichiometry of the reaction, for every one mole of N2H4, one mole of N2 is produced. The molar mass of N2H4 is approximately 32.05 g/mol.

Given that the rocket is designed to hold 1.35 kg (1350 g) of N2O4, we can calculate the moles of N2H4 required:

Moles of N2H4 = Mass of N2O4 / Molar mass of N2O4

Moles of N2H4 = 1350 g / 92.01 g/mol ≈ 14.67 mol

Since the stoichiometry is 1:1, the amount of N2 produced will be equal to the moles of N2H4:

Moles of N2 produced = Moles of N2H4 ≈ 14.67 mol

Expressing this answer in scientific notation, the amount of N2 produced according to the engineer's design would be approximately 1.467 x 10^1 mol.

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Answer:

Similarities: the states of the recants

Explanation:

atomic number 15

1S^2,2S^2,2P^6,3S^2,3P^3

atomic number 12

1S^2,2S^2,2P^6,3S^2

atomic number 9

1S^2,2S^2,2P^5

atomic number 18

1S^2,2S^2,2P^6,3S^2,3P^6

Answer: They are called substances and mixtures

Explanation:

Answer:

pure substances and mixtures.

Explanation:

Matter can be broken down into two categories: pure substances and mixtures. Pure substances are further broken down into elements and compounds. Mixtures are physically combined structures that can be separated into their original components. A chemical substance is composed of one type of atom or molecule.

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Increasing the volume of the solution decreases the concentration of the hydrogen ions which subsequently increases the pH;  hence, increasing volume will increase the pH.

Higher is the concentration of H plus ions, more acidic is the solution and  lower the concentration of H plus ions, the less acidic is the solution. Basic strength of a solution depends on the concentration of OH minus ions.

When an acid and alkali react together, they produce salt and water. Acid + alkali → salt + water . As you know, water is neutral, so the acid alkali come together to neutralize each other to make pH 7.

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A second-order extension of the Kohn-Sham total energy in density-functional theory (DFT) with respect to charge density fluctuations serves as the foundation for the density functional based tight binding (DFTB) approach.

What is DFTB method?

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0.50 moles of oxygen gas will react.

Balanced chemical eqation for reaction of calcium with oxygen:

2Ca + O₂ → 2CaO

n(Ca) = 1.0 mol; amount of calcium

From balanced chemical reaction, we can see that 2 moles of calcium reacts with one mole of oxygen gas. Ratio of moles is 2 : 1.

n(Ca) : n(O₂) = 2 : 1; ratio of the amount of substance of calcium and oxygen gas

n(O₂) = n(Ca) / 2; two times less amount of oxygen than calcium

n(O₂) = 1.0 mol / 2

n(O₂) = 0.5 mol; amount of oxygen gas needed for this chemical reaction.

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Answer:

answer is A.) Water

Answer:

a) water

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The correct option is d)nm.

The polio virus is an extremely small object, and its diameter is only about 2.8 x 10^-8 meters. As a result, it is more convenient to express its dimensions in a smaller unit of length. There are several options for units of length that could be used to express the size of a polio virus, but the most convenient one depends on the context in which it is being used.Since the polio virus is a very small object, expressing its size in meters is not very convenient. However, nanometers (nm) and micrometers (µm) are commonly used units of length to describe the size of viruses, bacteria, and other small objects. Of the two, nanometers are the most commonly used unit for viruses due to their small size.

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Explanation:

Write the balanced equation

Let's start off by writing the reaction for the formation of cryolite:

Al₂O₃  +  6NaOH  +  12HF    →    2Na₃AlF₆  +  9H₂O

Determine the limiting factor

moles = mass ÷ molar mass

moles of Al₂O₃ = 12200 g ÷ 101.96 g/mol = 119.65 mol

moles of NaOH = 57400 g ÷  39.997 g/mol = 1435.11 mol

moles of HF = 57400 g ÷ 20.01 g/mol = 2868.57 mol

Since Al₂O₃ has the smallest number of moles in the reaction, it is the limiting factor. As such we will have to use the moles of Al₂O₃ to determine the moles of cryolite that will be produced.

Find the mole ratio between the limiting factor and the cryolite

The mole ratio of Al₂O₃ : Na₃AlF₆ based on the balanced equation is 1 : 2

∴ since the moles of Al₂O₃ = 119.65 mol

        the moles of Na₃AlF₆ = 119.65 mol × 2 = 239.3 mol

Calculate the mass of the Cryolite

Mass cryolite = moles × molar mass

                      = 239.3 mol × 209.9 g/mol

                      =  50229.07 g

      ∴ kilograms of cryolite ≈ 50.23 kg

Answer:

H2 +Cl2 → 2HCI

2KNO3 → 2KNO2 + 02

4Li + O2 → 2Li2O

4Fe + 3O2 → 2Fe2O3

Fe2O3 + 3CO → 2Fe + 3CO2

Increasing the total pressure above a liquid raises the boiling point because the amount of kinetic energy required for the molecules to break free of the intermolecular forces in the liquid is raised. The correct answer is option A.

When the pressure is increased, the vapor pressure of the liquid also increases, meaning that more energy is required to overcome the pressure and allow the liquid to boil. This is due to the fact that the increased pressure makes it more difficult for the vapor to escape from the liquid. As a result, more energy must be supplied to the liquid to reach the boiling point, leading to an increase in the boiling point temperature. hence option A is correct.

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--The complete Question is, Increasing the total pressure above a liquid raises the boiling point. which statement best explains why?

A. The amount of kinetic energy required for the molecules to break free of the intermolecular forces in the liquid is raised.

B. The number of molecules with high kinetic energies is reduced.

C. The amount of kinetic energy required for the molecules to break free of the intermolecular forces in the liquid is decreased.

D. The number of molecules with high kinetic energies is increased. ---

The substances you identified acted as the acid and the base in this reaction is

H_2Se = H+ + HSe-

Hse- = H+ + Se-

H_2O + H+ = H_3O+

So we see that after accepting H+, H3O+ is the conjugate acid.

And H2Se here acts as the acid as it has dissociable H+ ions while SeH- acts as the conjugate base.

In the periodic table, hydrogen selenide is more acidic than Hydrogen sulphide. As the Hydrogen in Hydrogen selenide has more tendency to be dissociated.

Acid is the one which donates H+ ions and base is the one which accepts H+ ions. The conjugate base is the one which is left after the donation of the H+ ion. Conjugate acid is the one which is to be left after the acceptance of the H+ ion.

Also, water is less acidic than H2S.

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Answer:

The Big Bang Theory is the leading explanation about how the universe began. At its simplest, it says the universe as we know it started with a small singularity, then inflated over the next 13.8 billion years to the cosmos that we know today.

Explanation:

The balanced chemical equation is:

0.5C7H16 + O2 → 0.5CO2 + H2O

For balancing the chemical equation C7H16 + O2 → CO2 + H2O, we can use linear algebraic techniques. We need to determine the coefficients that balance the number of atoms on both sides of the equation.

Let's denote the coefficients for C7H16, O2, CO2, and H2O as a, b, c, and d, respectively.

The balanced chemical equation can be written as:

aC7H16 + bO2 → cCO2 + dH2O

To balance the carbon (C) atoms, we have:

7a = c (Equation 1)

To balance the hydrogen (H) atoms, we have:

16a = 2d (Equation 2)

To balance the oxygen (O) atoms, we have:

2b = 2c + d (Equation 3)

We have three equations (Equations 1, 2, and 3) and four unknowns (a, b, c, d). To solve this system of equations, we can write it in matrix form and find the solution using linear algebraic techniques.

The augmented matrix for the system of equations is:

[ 7 0 -1 0 | 0 ]

[ 0 0 0 -2 | 0 ]

[ 0 -2 2 -1 | 0 ]

By performing row operations to row-reduce the augmented matrix, we can obtain the solution:

[ 1 0 -0.5 0 ]

[ 0 1 -1 -0.5 ]

[ 0 0 0 0 ]

The solution to the system of equations is:

a = 0.5

b = 1

c = 0.5

d = 1

Putting the values of a,b,c, and d we get the balanced chemical equation as:

0.5C7H16 + O2 → 0.5CO2 + H2O

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Answer:

ELEMENTS

COMPOUNDS

Elements are made up of one kind of atoms.

Compounds are made up of two or more kinds of atoms.

Elements cannot be broken down into simpler substances by any physical or chemical method.

Compounds can be broken down into simpler substances by chemical methods.

Elements have their own set of properties.

Properties of a compound differ from those of their elements.

Examples: Hydrogen, Oxygen

Examples: Water, Sodium chloride

Answer:

an element is a pure substance that cannot be split into simpler substance by chemical means while a compound is a mixture made up of two or more elements chemically combined

Explanation:

In a chemical equation, coefficients serve the function of displaying the ratio in which reactants and products interact to produce a chemical reaction.

In mathematics and science, coefficients are constant expressions that relate to a product's properties. For instance, the coefficient is the only constant in the friction calculation equation.

Coefficients are necessary for balancing equations. They are given a number before compounds or elements. Subscripts, which come after an element's symbol, are used to indicate the element's number. If an element symbol is followed by a subscript, the "2" in H2O stands in for two H atoms.

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Explanation:

number of mole s of H

2

= 0.25 moles

number of molecules = moles * Avogadro’s Number

number of molecules = 0.25×(6.022×10

23

)

number of molecules = 1.505×10

23

single molecule of hydrogen contains two H-atoms. So,

number of atoms = 2×(1.505×10

23

) = 3.01×10

23

The correct volume of this wood block which has the given dimensions is 254.23 cubic cm.

In Science, a significant figure can be defined as the number of digits in a numerical data (value), typically a measurement from an experiment, which enhances its degree of accuracy.

By dimension, a wood block is a rectangular prism. Mathematically, the volume of a rectangular prism should be calculated by using this formula:

V = L × W × H

Where:

Substituting the given parameters into the formula, we have;

V = 7.50 × 7.45 × 4.55

Volume, V = 254.23 cubic centimeters.

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Answer:  

Solubility is a property referring to the ability for a given substance, the solute, to dissolve in a solvent. It is measured in terms of the maximum amount of solute dissolved in a solvent at equilibrium. The resulting solution is called a saturated solution.

the state of being thick, sticky, and semifluid in consistency, due to internal friction.or a quantity expressing the magnitude of internal friction, as measured by the force per unit area resisting a flow in which parallel layers unit distance apart have unit speed relative to one another.

1.  frequency

the rate at which something occurs or is repeated over a particular period of time or in a given sample.

Ductile: of a metal) able to be drawn out into a thin wire.

able to be deformed without losing toughness; pliable, not brittle

Malleable:(of a metal or other material) able to be hammered or pressed permanently out of shape without breaking or cracking.

Combustible:able to catch fire and burn easily.

Radioactive:Radioactivity is the spontaneous emission of radiation in the form of particles or high energy photons resulting from a nuclear reaction. ... A substance that contains unstable atomic nuclei is considered to be radioactive. Radioactive decay is a random or stochastic process that occurs at the level of individual atoms.

Corrosive:t ending to cause corrosion(Corrosion is when a refined metal is naturally converted to a more stable form such as its oxide, hydroxide or sulphide state this leads to deterioration of the material.)

Explanation:

(source: google for all)

Answer:

true

Explanation:

Answer:

Germanium has the larger atomic radius.

The temperature of the liquid in the flask on the previous page measured when the liquid in the thermometer has stopped rising   to measure confirmed or fixed temperature.

When the liquid in the flask is heated, its temperature rises, and when a thermometer is inserted into the flask to gauge the liquid's temperature, the liquid within the thermometer also begins to warm up.

The temperature of the liquid rises as a result of heat being transferred from a high temperature to a low temperature until the temperatures are equal. Therefore, when the liquid stops rising, both are at the same temperature, and this is how the liquid in the flask is being measured.

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The percent ionization of a 0.331M solution of HCN is found to be 0.00337%.  The pH of the solution is  4.953. The correct option is E. 4.953.

To solve this problem, we need to use the equation for percent ionization:

% ionization = (concentration of ionized acid / initial concentration of acid) x 100%

We can rearrange this equation to solve for the concentration of ionized acid:

concentration of ionized acid = % ionization / 100% x initial concentration of acid

Plugging in the given values, we get:

concentration of ionized acid = 0.00337 / 100 x 0.331 = 0.000011187 M

Now, we can use the equation for the ionization of HCN to set up an expression for the equilibrium constant (Ka):

HCN + H2O ↔ H3O+ + CN-

Ka = [H3O+][CN-] / [HCN]

We can assume that the concentration of H3O+ is equal to the concentration of ionized acid, since the ionization of HCN produces one H3O+ ion for every HCN molecule that ionizes. We can also assume that the concentration of CN- is equal to the concentration of H3O+.

Therefore:

Ka = (concentration of ionized acid)^2 / (initial concentration of acid - concentration of ionized acid)

Plugging in the values we calculated, we get:

Ka = (0.000011187)^2 / (0.331 - 0.000011187) = 6.2 x 10^-10

Now, we can use the equation for the pH of a weak acid:

pH = pKa + log([A-] / [HA])

Since we assumed that the concentration of CN- is equal to the concentration of ionized acid, we can substitute [CN-] for [A-] and [HCN] - [CN-] for [HA]. We also know that pKa = -log(Ka).

Therefore:

pH = -log(6.2 x 10^-10) + log(0.000011187 / (0.331 - 0.000011187)) = 4.953

Therefore, the pH of the solution is e. 4.953.

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In the given reaction:

the reactants are solid SnO₂ and gaseous H₂

the products are solid Sn and gaseous H₂O

The reactants in a given reaction are the molecules which combine together chemically to form a new substance or substances.

The new substance or substances formed are called the products.

The equation of the given reaction is as shown below:

The given reaction is a redox reaction.

The reactants are SnO₂ and H₂ which exists as a solid and a gas respectively.

The products are Sn and H₂O which exists as a solid and a gas respectively.

In the reaction, tin (iv) oxide is reduced to metallic tin whereas hydrogen gas is oxidized to water.

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Answer:

D. 97%

Explanation:

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Answer:

d

Explanation: