which of the following are examples of colligative properties. freezing point elevation increases vapor pressure increases osmotic pressure boiling point elevation

The following balanced chemical equation may be used to describe the interaction between aluminum (Al) and calcium nitrate (Ca(NO₃)₂):

2 Al + 3 Ca(NO₃)₂ → 2 Al(NO₃)3 + 3 Ca

Reactants are the chemicals that begin a chemical reaction, while products are the compounds that are created as a result of the reaction.

The substances that initiate a chemical reaction. Products are the substances that are created during the reaction. Compounds or elements can act as reactants and products.

Aluminium and calcium nitrate interact in this reaction to form aluminium nitrate (Al(NO₃)₃) and calcium (Ca), which are the end products.

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Answer:25.75

Explanation:

Answer:

39.1-32.5 and you will find your answer it always like that, you subtract your starting point from your ending point

Explanation:

The volume of the piece of lead is 6.6 mL

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

The volume of the lead can be obtained as follow:

Volume of lead = (Volume of water + Lead) – (Volume of water)

Volume of lead = 39.1 – 32.5

Volume of lead = 6.6 mL

Therefore the volume of the lead is 6.6 mL

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Answer:

A

Explanation:

I took the test 100%, good luck

Erosion and deposition work together to form sand dunes as waves cause erosion along coastlines and deposit sand away from the shore. So the correct option is A.

Erosion is the removal of the material's surface from the crust of the Earth. It is mainly the debris of soil and rock. The eroded materials are transported by natural agents such as water or wind from the point of their removal.

The term erosion gives an explanation for the wearing down and molding of the landforms on the surface of Earth. This includes the rock weathering from its original position, the transport of this weathered material, and the erosion which is the result of the action of wind or glacial processes, etc.

The more appropriate term for this would be denudation or degradation. This includes processes of mass movement. This is a definition of erosion that is very narrow and excludes the process of the transport of eroded material by natural agencies.

Therefore, the correct option is A.

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Answer:

ok, here is your answer

Explanation:

AI-generated answer

To find the mass of oxygen that reacted, we need to use the Law of Conservation of Mass, which states that in a chemical reaction, the mass of the reactants equals the mass of the products.

First, we need to find the number of moles of hydrogen that reacted:

Molar mass of hydrogen (H₂) = 2.016 g/mol

Number of moles of H₂ = mass/molar mass = 46.2 g/2.016 g/mol = 22.92 mol

Next, we need to use the balanced chemical equation to find the number of moles of water produced:

hydrogen + oxygen → water

2H₂ + O₂ → 2H₂O

From the equation, we can see that for every 2 moles of H₂, 1 mole of O₂ is required to produce 2 moles of H₂O. Therefore, the number of moles of O₂ required to produce 22.92 moles of H₂O is:

Number of moles of O₂ = 1/2 x 22.92 mol = 11.46 mol

Finally, we can find the mass of oxygen that reacted by using its molar mass:

Molar mass of oxygen (O₂) = 32.00 g/mol

Mass of oxygen = number of moles x molar mass = 11.46 mol x 32.00 g/mol = 366.72 g

Therefore, the mass of oxygen that reacted is 366.72 g.

Therefore, the amount of energy required to change 207 g of water ice at −10 ∘C to steam at 125 ∘C is 744.3618 kJ.

Similar to how kilometres measure distance, a kilojoule is a measurement used to measure energy. Some nations continue to use the Calories (Cal) system, which was once used to quantify food energy. These are the conversions: 1 kJ equals 0.2 Cal.

To figure out how much energy is needed to convert 207 g of water ice at -10°C to steam at 125°C, we must divide the process into several stages and figure out how much energy is needed for each one:

Heating ice from -10°C to 0°C:

q1 = m × Cm(ice) × ΔT

= 207 g ÷ 18.02 g/mol × 36.57 J/(mol⋅∘C) × (0 - (-10)) ∘C

= 41324.8 J

= 41.3248 kJ

Melting ice at 0°C:

q2 = n × ΔHfus

= m ÷ M × ΔHfus

= 207 g ÷ 18.02 g/mol × 6.01 kJ/mol

= 56.804 kJ

Heating water from 0°C to 100°C:

q3 = m × Cm(water) × ΔT

= 207 g ÷ 18.02 g/mol × 75.40 J/(mol⋅∘C) × (100 - 0) ∘C

= 174667.6 J

= 174.6676 kJ

Vaporizing water at 100°C:

q4 = n × ΔHvap

= m ÷ M × ΔHvap

= 207 g ÷ 18.02 g/mol × 40.67 kJ/mol

= 467.7326 kJ

Heating steam from 100°C to 125°C:

q5 = m × Cm(steam) × ΔT

= 207 g ÷ 18.02 g/mol × 36.04 J/(mol⋅∘C) × (125 - 100) ∘C

= 3832.8 J

= 3.8328 kJ

Total energy required:

qtotal = q1+q2+q3+q4+q5

= 41.3248 kJ + 56.804 kJ + 174.6676 kJ + 467.7326 kJ + 3.8328 kJ

= 744.3618 kJ.

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Answer:

the relationship between independent and dependent variable

Explanation:

A straight line or linear graph is one of the ways to represent a given data. It shows the relationship between two given set of data; one called the independent variable is plotted on the x-axis (horizontal) while the other called the dependent variable is plotted on the y-axis (vertical).

The straighter the line is, the stronger the relationship between the two variables and vice versa. Hence, the straight line in the graph represents the relationship between independent and dependent variable.

The best conclusion that can be drawn is that the atom seven neutrons and eight protons.

Atoms are the smallest particles of an element that can take part in a chemical reaction.

In the structure of an atom, the nucleus is the center of anatom. Within the nucleus of an atom, two sub-particles that contribute to the mass of the atom are present.

The proton is the positively charged particle, while the neutron is neutral.

An aton that is composed of eight positively charged particles or protons and has a mass of 15 AMU will have the following number of neutrons:

number of neutrons = 15 - 8

number of neutrons = 7 neutrons

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Answer:

I would say its 25 calories in a sample of snack food

Explanation:

The calories are in a sample of a snack food containing 125 calories is 0.125 kilo calories.

Calories are defined as a measurement of unit but it does not measure weight, height or length. It is mainly defined as the unit of energy.

For calculating the calories first we have to look how much proteins, carbohydrates and fats are there in the food. Then multiply the total gram of proteins, carbohydrates and fats by 4 because 1 gram of protein, carbohydrate and fat is equal to 4 calories.

As 1 calorie = 0.001 kilocalorie

So, 125 calorie = 0.125 kilocalorie

Thus, the  calories are in a sample of a snack food containing 125 calories is 0.125 kilo calories.

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Answer:

Explanation:

molar mass Cr(NO3)3 = 238 g/mol

Convert 325 ml to liters:  325 mls x 1 L / 1000 mls = 0.325 L

Convert 10.0 g to moles:  10.0 g x 1 mol / 238 g = 0.0420 moles

Molarity = moles/liters = 0.0420 moles / 0.325 L = 0.129 M (3 sig. figs.)

The amount of energy required to change 20g of water to steam is +150 KJ/mol. The standard heat of vaporization of water is 7.5 KJ/mol.

The amount of energy required to convert a liquid to a vapour at constant temperature and pressure is known as latent heat. The heat of fusion is the energy required to convert a solid to a liquid, and the heat of sublimation is the energy required to convert a solid to a gas.

Given:

q = 150 KJ/mol.

m = 20gram

The standard heat of vaporization of water is calculated by given formula

Hv = q / m

Where,

Hv is heat of vaporization of water

q is heat energy

m is mass

By substituting given value in equation we get,

Hv = 150 / 20

= 7.5 KJ/mol

Thus, the standard heat of vaporization of water is 7.5 KJ/mol.

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Answer:

Thermosphere

Explanation:

More specifically the ionosphere, since the ionosphere is the lower part of the thermosphere.

Hope this helps!

Answer:

The value of pOH of a solution is 2.28

We need to find the [OH-] in a solution. We know that,

pOH=-\text{log}[OH^-]pOH=−log[OH−]

Put all the values,

\begin{gathered}2.28=-\log[OH^-]\\\\=0.00524\end{gathered}2.28=−log[OH−]=0.00524

So

The false statement from the above is that: Temporary charge imbalances in the molecules lead to London dispersion forces.

Generally, the factors which affects the London dispersion forces a dispersion force are as follows:

However, London dispersion forces simply refers to a sort of temporary attractive force formed when electrons in two adjacent atoms occupy positions that make the atoms form dipoles.

So therefore, temporary charge imbalances in the molecules lead to London dispersion forces is a false statement

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Answer:

\(51y6. \times { \times }^{2} \)

Answer:

Explanation:

Convert

Iron(III) carbonate ====> iron(III) oxide + carbon dioxide

I take it you want this balanced.

First you have to put this into periodic table information,

Fe(iii) 2 (CO3)3 ====> Fe(iii)2O3 + CO2

Let's see what's wrong. The left side has 3 Carbons and 9 0xygens. It is up to the CO2 to put this in balance. Any time you touch either the Fe(iii)2(CO3)3 or Fe(iii)2O3 then you have to give the other one the same balance number, other wise the Fe(iii)s will not be balanced. So all you can hope for is to use CO2 to bring things into balance.

Answer

Fe(iii) 2 (CO3)3 ====> Fe(iii)2O3 + 3CO2

That should do it. There are 3 carbons on the left and right, and 9 Oxygens on both sides.

People refuse to answer questions from authorized Stats SA officials because they don't want to reveal confidential information.

An official Stats is an official who has the function of asking citizens for different information in order to establish general statistics for all citizens.

Some people refuse to answer questions out of mistrust, because they don't want to share personal information.

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Amounts of absorbance have no units. Centimeters are used to measure path length. The unit of molar absorptivity is derived from these two as M⁻¹cm⁻¹.

Molar absorptivity is the characteristic that gauges how strongly a chemical species absorbs light of a specific wavelength. Beer-Lambert law links a light's attenuation to the features of the medium it travels through. This law is given as A = εcl where A is the absorbance, l is the path length in centimeters, c is molar concentration in M, and ε is molar absorptivity. From the above equation, we can find the unit of molar absorptivity as,

\(\begin{aligned}\epsilon&=\frac{A}{c\cdot l}\\&=\frac{\text{no unit}}{\text{M\;cm}}\\&=\mathrm{M^{-1}cm^{-1}}\end{aligned}\)

Therefore, the required answer is M⁻¹cm⁻¹.

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Answer:

See explanation below

Explanation:

First, let's write the reaction:

NH₄SH(s)   <------> H₂S(g) + NH₃(g)

The reaction is already balanced so we don't need to do anything else.

Second, let's take into account the following. The Kc expression for this reaction, only compounds in gaseous state are the only ones that contribute to the equilibrium. Solid and liquid do not contribute to the Kc expression. This is because solid and liquid have a constant concentration near to 1, so, it won't do any difference.

Knowing this, the Kc expression for this reaction is:

Kc = [H₂S] [NH₃]

Now, to calculate Kp from Kc, there's an expression that helps a lot to do this. The expression is the following:

Kp = Kc (RT)ᵃⁿ    (1)

Where:

R: universal constant of gases

T: Temperature in K

ᵃⁿ = difference of the coefficients of the reaction.

This expression comes from the fact that Kp is an expression that instead of working with concentrations, it works with pressure.

If we use the ideal gas equation we have:

PV = nRT

Solving for P:

P = nRT/V        and C = n/V   so

P = CRT

If we now replace this, in the Kp expression of equilibrium we have:

Kp = pH₂S * pNH₃

Kp = ([H₂S]RT)¹ ([NH₃]RT)¹

Kp = (RT)¹⁺¹ ([H₂S] [NH₃])

Kp = (RT)²Kc

So finally the expression for Kp would be:

Hope this helps

The name "sodium carbonate" refers to the chemical formula Na2CO3, which consists of two sodium ions (Na+)

The compound Na2CO3•4H2O is called sodium carbonate decahydrate. It is a hydrate compound, indicating that it contains water molecules within its crystal structure. In this case, there are four water molecules associated with each molecule of sodium carbonate.

The name "sodium carbonate" refers to the chemical formula Na2CO3, which consists of two sodium ions (Na+) and one carbonate ion (CO3^2-). The "decahydrate" part of the name indicates the presence of ten water molecules (H2O) in the compound.

When sodium carbonate decahydrate is formed, each sodium carbonate molecule associates with four water molecules, resulting in the formula Na2CO3•4H2O. The water molecules are not chemically bonded to the sodium carbonate but rather held within the crystal lattice through weak intermolecular forces.

Sodium carbonate decahydrate is commonly known as soda ash or washing soda. It is used in various applications such as water treatment, glass manufacturing, detergent production, and pH regulation in swimming pools.

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To calculate the mass of magnesium chloride (MgCl2) produced, we need to know the mass of magnesium (Mg) that reacts with the hydrochloric acid (HCl). We also need to know the balanced chemical equation for the reaction, which is:

Mg + 2HCl → MgCl2 + H2

From the equation, we can see that one mole of Mg reacts with two moles of HCl to produce one mole of MgCl2 and one mole of H2.

First, we need to determine how many moles of Mg we have. Let's assume we have 5.0 grams of Mg. The molar mass of Mg is 24.31 g/mol, so the number of moles of Mg is:

5.0 g / 24.31 g/mol = 0.206 moles

Next, we need to use the mole ratio from the balanced equation to determine how many moles of MgCl2 are produced. From the equation, we know that one mole of MgCl2 is produced for every one mole of Mg that reacts, so the number of moles of MgCl2 produced is also 0.206 moles.

Finally, we can calculate the mass of MgCl2 produced. The molar mass of MgCl2 is 95.21 g/mol, so the mass of MgCl2 produced is:

0.206 moles x 95.21 g/mol = 19.6 g

Therefore, the mass of magnesium chloride produced is 19.6 grams.

Answer:

_c+_so2-_cs2+_co= Toxic

Answer:

The fraction is 6/7

Explanation:

6/7 is the simplified fraction for 54/63 by using the GCD or HCF method. Thus, 6/7 is the simplified fraction for 54/63 by using the prime factorization method.

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KH2PO4 is a more suitable choice as a buffer because it has a greater buffering capacity due to the presence of the weak acid and its conjugate base.

KHPo4 is not considered an effective buffer compared to KH2PO4 due to its limited buffering capacity. The effectiveness of a buffer is determined by the concentration and dissociation properties of its conjugate acid-base pair.

KH2PO4 is a salt composed of the weak acid H2PO4- and its conjugate base HPO4^2-. In an aqueous solution, KH2PO4 can dissociate to release H+ ions from the H2PO4- component, which acts as a weak acid, and the HPO4^2- component can accept H+ ions, acting as a weak base. This allows KH2PO4 to effectively resist changes in pH when small amounts of acid or base are added to the solution.

On the other hand, KHPo4 consists of the strong acid H3PO4 and the weak base HPO4^2-. H3PO4 fully dissociates in water, providing a large concentration of H+ ions, making it difficult for the HPO4^2- to effectively act as a base and maintain pH stability.

Therefore, KH2PO4 is a more suitable choice as a buffer because it has a greater buffering capacity due to the presence of the weak acid and its conjugate base.

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The binding energy per nucleon for the ¹⁹F nucleon is equal to 7.786 MeV/nucleon.

Binding energy can be defined as the minimum quantity of energy that is required to remove the particle from the system. Nuclear binding energy can be described as the energy required to dismantle a nucleus of an atom into free neutrons and protons.

The binding energy will be determined from the mass defect. Mass defect is calculated from the difference between the mass observed and the expected combined mass.

Given the mass of the ¹⁹F = 18.9984 a.m.u.

The mass defect for the ¹⁹F can be calculated as:

Δm = \((M _n +M_p) - M_F\)

\(\triangle m =( 9\times 1.0078 + 10 \times 1.0087 )- 18.9984\)

\(\triangle m =0.1588 \;a.m.u.\)

The binding energy for the fluorine can be calculated as:

E = Δmc²

E = 0.1588 × 931.5

E = 147.92 MeV

The binding energy per nucleon of ¹⁹F can be calculated as:

B.E.N. = 147.92/18.9984 = 7.786 MeV per nucleon

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