oliver's science project consists of six sealed and labeled containers. he challenges his classmates to identify pure substances versus mixtures. identify each substance as a pure substance or mixture.

We need to find the mass of 1.6x10^20 molecules of carbon monoxide

First, we must find the number of mol in the 1.6x10^20 molecules

For this, we need to use the avogadro's number ( 6.02*10^23 )

Then, we must calculate the molar mass of carbon monoxide

M(CO) = 12 g/mol + 16 g/mol = 28 g/mol

Finally, we must multiply the number of mol by the molar mass to find the mass

ANSWER:

0.007

Answer:

Earth

Explanation:

Answer:

smoke from a fire Is not an example of energy

Answer:

378mL

Explanation:

The following data were obtained from the question:

Pressure (P) = 99.19 kPa

Temperature (T) = 28°C

Number of mole (n) = 0.015 mole

Volume (V) =...?

Next, we shall convert the pressure and temperature to appropriate units. This is illustrated below:

For Pressure:

101.325 KPa = 1 atm

Therefore, 99.19 kPa = 99.19/101.325 = 0.98 atm

For Temperature:

T(K) = T(°C) + 273

T(°C) = 28°C

T(K) = 28°C + 273 = 301K.

Next we shall determine the volume of N2. The volume of N2 can be obtained by using the ideal gas equation as shown below:

PV = nRT

Pressure (P) = 0.98 atm

Temperature (T) = 301K

Number of mole (n) = 0.015 mole

Gas constant (R) = 0.0821atm.L/Kmol.

Volume (V) =...?

0.98 x V = 0.015 x 0.0821 x 301

Divide both side by 0.98

V = (0.015 x 0.0821 x 301) /0.98

V = 0.378 L

Finally, we shall convert 0.378 L to millilitres (mL). This is illustrated below:

1L = 1000mL

Therefore, 0.378L = 0.378 x 1000 = 378mL

Therefore, the volume of N2 collected is 378mL

Answer:

In a laboratory, a solution of sulfuric acid (H2SO4) was reacted with another of sodium hydroxide (NaOH), both aqueous. To form sodium sulfate (Na2SO4) and 2 molecules of liquid water (H2O). Complete in relation to the chemical equation that represents the reaction:

Explanation:

The balanced chemical equation of the reaction is:

\(H_2SO_4(aq)+2NaOH(aq)-> Na_2SO_4(aq)+2H_2O(l)\)

Thus, one mole of sulfuric acid reacts with two moles of sodium hydroxide.

Of the following, which are not polyprotic acids? (select all that apply)
- HNO3
- НСІ


A polyprotic acid is an acid that has more than one acidic proton, which can be donated in a stepwise manner. Each proton is donated with a different acid dissociation constant (Ka) value.
Out of the given options, HNO3 and НСІ are not polyprotic acids. They both have only one acidic proton and can donate it in a single step.
H2SO4, on the other hand, is a polyprotic acid as it has two acidic protons, which are donated in two steps. The first dissociation of H2SO4 results in the formation of HSO4- ion, which is also an acid and can donate its proton to form SO42- ion.
НІ is also a polyprotic acid as it can donate its proton twice, resulting in the formation of I- and H2I+ ions.
In summary, the not polyprotic acids from the given options are HNO3 and НСІ.

These are monoprotic acids, meaning they can only donate one proton (H+) per molecule. On the other hand, H2SO4 (Sulfuric acid) is a polyprotic acid, as it can donate two protons (H+) per molecule.

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1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d³ or [Ar] 4s²3d³

Given

Vanadium, atomic number 23

Required

The electron configuration

Solution

In an atom, there are levels of energy in the shell and subshell  

This energy level is expressed in the form of electron configurations.  

Charging electrons in the subshell uses the following sequence:  

1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁶, 5s², 4d¹⁰, 5p⁶, 6s², etc.  

The electron configuration is based on the atomic number which indicates the number of electrons of the atom

Vanadium has the atomic number 23, so the number of electrons = 23

Electron configuration:

1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d³

or we can write it using the noble gas notation

[Ar] 4s²3d³

False, as Chlorine and chloramine are the major disinfectants used in public water systems.

What is the purpose of using chlorine to clean water sources?

Chlorine helps lessen the taste and odor of water while also eradicating harmful microorganisms including viruses, parasites, and bacteria. The slime bacteria, molds, and algae that frequently develop on the walls of water mains, in storage tanks, and in water supply reservoirs are also helped to get rid of by chlorine.

Chemical compounds with chlorine and ammonia are referred to as chloramines. The specific form of chloramine used to disinfect drinking water is known as monochloramine, and it is added to water at concentrations that are effective at killing bacteria while maintaining water safety.

Thus the two main disinfectants utilized in public water systems are chlorine and chloramine.

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Answer:

943.82 ml

Explanation:

Assuming constant pressure

V1/T1 = V2/T2

T2 * V1/T1 = V2       ( T must be in K units)

(220 + 273.15) * 540 / (273.15 + 9) = 943.8 ml

Answer:

Magnesium Bromide

Explanation:

MgBr₂

Answer:

x²+6x+5=0

On comparing with the equation

ax² + bx + c = 0

a=1, b = 6 and c = 5

Now

b²– 4ac = 6² – 4 x 1 x 5 = 36 - 20 = 16

\(x = \frac{ - b \:± \: \sqrt{b {}^{2} - 4ac } }{2a} \\ \\ x = \frac{ - 6\:± \: \sqrt{16 } }{2 \times 1} \\ \\ x = \frac{ - 6± {4} }{2} \\ \\ x = \frac{ - 6 + {4} }{2} \: \: or \: \: x = \frac{ - 6 - {4} }{2} \\ \\ \implies \: x = \frac{ \cancel-2 }{ \cancel2}^{-1 }\: \: or \: \: x = \frac{ \cancel-10 }{ \cancel2}^{-5}\\ \\ \implies \: { \blue{\fbox{ \: x = - 1 \: \: \: or \: \: \:x = - 5}}}\)

\( {x}^{2} + 6x + 5 = 0 \\ \\ {x}^{2} + 5x + x + 5 = 0 \\ \\ x(x + 5) + 1(x + 5) = 0 \\ \\ (x + 1)(x + 5) = 0.\)

\(x = - 1 \\ x = - 5.\)

Answer:151 Eu= 48.01%

152 Eu= 51.99%

Explanation:

Answer:

92

Explanation:

The enthalpy of combustion of cymene is -3475.18 kJ/mol.

To calculate the enthalpy of combustion, we need to use the formula:

ΔH = q / n

where ΔH is the enthalpy of combustion, q is the heat released during the combustion, and n is the number of moles of cymene combusted.

First, we need to calculate the number of moles of cymene combusted:

moles = mass / molar mass = 1.608 g / 134.21 g/mol = 0.012 mol

Next, we calculate the heat released during the combustion using the equation:

q = C × ΔT

where C is the heat capacity of the bomb calorimeter and ΔT is the temperature increase.

q = 3.640 kJ/°C × 19.35 °C = 70.494 kJ

Now we can calculate the enthalpy of combustion:

ΔH = q / n = 70.494 kJ / 0.012 mol = -3475.18 kJ/mol

Therefore, the enthalpy of combustion of cymene is approximately -3475.18 kJ/mol. The negative sign indicates that the combustion is exothermic, meaning heat is released during the process.

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Answer:

a chemical compound

Explanation:

copper(ii) chlorate is a chemical compound of the transition metal copper and the chlorate anion with basic formula cu(cio)3 and 2

Acetic acid's acid dissociation constant (Ka) is approximately 2.95× \(10^{(-3)}\).

The pH of a solution is the concentration of hydrogen ions in the solution.

The relationship between pH, Ka, and the concentrations of the acid and its conjugate base is

\(pH = pK_{a} +log \frac{[A^{-}]}{[HA]}\) where \([A^{-}]\) is the concentration of \(CH_{3}COO^{-}\).

In this case, the pH is given as 2.47, and the concentration of acetic acid is 0.63 M. We can assume that the concentration of the conjugate base (acetate ion, \(CH_{3}COO^{-}\)) is inappreciable as compared to the concentration of the acid. It is because the given acid is a weak acid and does not dissociate easily.

Using the Henderson-Hasselbalch equation, we can rearrange it to solve for pKa:

\(pK_{a} = pH-log\frac{[A^{-}]}{[HA]}.\)

As the concentration of the conjugate base is very less so, we can simplify the equation to:

\(pKa = pH \\Ka =10^{(-pKa)}=10^{(-2.47)}.\)

So, Ka ≈ 2.95 × \(10^{(-3)}\).

The complete question is

The pH of a 0.63 M solution of acetic acid is measured to be 2.47. Calculate the acid dissociation constant K of acetic acid. Be sure your answer has the correct number of significant digits.  

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Answer:

Its either B or D?

i think i would say just choose which one you think is right

The term used to denote the concentration of electrolytes in a given volume is "molarity".

Molarity-

Molarity is the number of moles of solute dissolved in one liter of the solution. Molarity is the most widely used concentration metric in chemistry, and it is frequently denoted by "M." It denotes the amount of solute in moles per liter of solution.

A solution's molarity can be calculated using the following formula:

Molarity = moles of solute / liters of solution

Molarity is often used to express the concentration of a solution's electrolytes because electrolytes break into ions when dissolved in a solvent, allowing for electrical conductivity.

Molarity can be used in other applications, such as stoichiometry, which involves determining how much of one compound is required to react completely with another.

Molarity is a useful tool for solving problems that involve chemical reactions since the number of moles of a substance is frequently used to establish reaction ratios, limit reactants, and determine the theoretical yield.

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Answer:

Every single tonne of recycled plastic cuts carbon emissions by 1.6t and preserves 2t of crude oil. And each tonne that is recycled is not just one tonne less which the industry has to buy as crude oil on the global market – it is also one tonne less of waste plastic in our seas and oceans.

Answer:

The answer is D..i.e phosphate. it consists of 1p and 4oxygen atoms

\(PO_4^{3-}\)  is a polyatomic ion. Hence, option D is correct.

What is a polyatomic ion?

Polyatomic ions are ions which consist of more than one atom.

The prefix poly- means many, so a polyatomic ion is an ion that contains more than one atom. This differentiates polyatomic ions from monatomic ions, which contain only one atom.

\(PO_4^{3-}\) is a chemical derivative of phosphoric acid with a chemical name Phosphate. Phosphate is also called Phosphate ion or Orthophosphate.

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Answer:

all of them

Explanation:

these all are true

Answer:

They all are correct.

Explanation:

The covalent compounds do not have the same properties as the ionic compounds so they must give them to us.

We know that the way that a compound would behave would depend on the kind of bonds that we have in the molecules of the substance that we have.

Let it be known that the ionic bonds are found in the compounds that are soluble in water and do have a high m,elting and boiuling npoint which means that they can be identified when they are disolved in water as well as when they are heated.

The covalent compounds do lack all of these properties and as such they can not be easily identified as we can identify the ionic compounds. This is the difference that exists between the ionic compounds and the covalent compounds that we know about.

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Answer:

density = 5 g/ml

Explanation:

D=m/v. Mass=30g and Volume=6mL

SO solve for D when m = 30 and v = 6

D=m/v

D = 30/6

density = 5 g/ml

Answer:

Burning of fossil fuels releases a lot of pollutants such as sulphur dioxide and nitrogen dioxide into the atmosphere, and reacts with the water in the atmosphere to form sulphuric acid or nitric acid. Hence, acid rain is formed as that acid comes down from the atmosphere along with the rain.

Explanation:

Hope this helped!

There are 20 grams of Sodium hydroxide in a molar solution that has a volume of 500 cm3.

Caustic soda and lye are two other names for sodium hydroxide. It is a typical component of soaps and cleansers. Sodium hydroxide seems to be a white, unscented solid at room temperature. Sodium hydroxide is a colorless, odorless liquid. Strong acids and water can cause explosive reactions with it.

Molarity is calculated by

moles (solute) / volume of solution in L

No. of moles = mass / molar mass

We have to find mass of sodium hydroxide (NaOH)

As we know, in 1 L (1000 cm³) of molar solution there is 40 gram of NaOH present.

From using this statement, 500 cm³ of a molar solution, means half liter of a molar solution contain -

= 40 / 2

= 20 gram of NaOH.

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Yes, a miscibility gap exists for a mixture of water and 1-butanol at 928C. The range of compositions over which this gap exists is between the eutectic point and the upper cloud point.

The eutectic point is the composition where the two components form two liquid phases, and the upper cloud point is the composition where the two components form a single liquid phase.

The van Laar parameters for this system (L12) indicate the degree to which changes in temperature, pressure, and composition affect the relative solubility of the two components.

For a mixture of 1-butanol and water at 928C, the relative solubility of the two components decreases as the composition deviates from the eutectic point, resulting in a miscibility gap. The range of compositions over which this gap exists is determined by the van Laar parameters.

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