Which of the following has highest boiling points
a )NH3 b)WATER c)IODINE d)AMMONIA

Answer:

The freezing point will be -2.046°C.

Explanation:

The freezing point depression equation is \(\Delta T_f = k_f \cdot m \cdot i\)

Where;

\(\Delta T_f\) = The temperature depression of the freezing point

\(k_f\)= The constant of freezing point depression which is solvent dependent = 1.86°C/m

i = The number of particles the substance decomposes into in solution = 1 for sugar (a covalent compound)

m = The molality of the solution = 1.1

Therefore, we have;

\(\Delta T_f = 1.86 \times 1.1 \times 1 = 2.046 ^{\circ}C\)

Therefore the freezing point will be 0 - 2.046°C = -2.046°C.

According to OSHA (Occupational Safety and Health Administration), safety measures for using dental materials with potentially hazardous chemicals can be found in sources such as Material Safety Data Sheets (MSDS), OSHA's Hazard Communication Standard (HCS), and dental office safety manuals or protocols.

According to OSHA (Occupational Safety and Health Administration), safety measures that should be taken when using dental materials with potentially hazardous chemicals can be found in a few different sources:

Material Safety Data Sheets (MSDS): Manufacturers of dental materials are required to provide MSDSs for their products. These sheets contain detailed information about the potential hazards, safe handling procedures, storage recommendations, and emergency measures related to the chemicals present in the dental materials.

OSHA's Hazard Communication Standard (HCS): This standard requires employers to provide information and training to employees about the hazardous chemicals they may be exposed to in the workplace. The HCS ensures that employees have access to information on the hazards, proper handling, and use of hazardous chemicals, including dental materials.

Dental Office Safety Manuals or Protocols: Dental offices often develop their own safety manuals or protocols that outline specific safety measures for handling dental materials. These may include guidelines on proper storage, handling, personal protective equipment (PPE) requirements, spill cleanup procedures, and waste disposal methods.

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Answer:

13.9g of CuSO4•5H2O

Explanation:

We'll begin by writing the balanced equation for the reaction. This is given below:

CuSO4•5H2O → CuSO4 + 5H2O

Next, we shall determine the mass of CuSO4•5H2O heated and the mass of H2O produced from the balanced equation.

This is illustrated below

Molar mass of CuSO4• 5H2O = 63.5 + 32 + (16x4) + 5(2x1 + 16)

= 63.5 + 32 + 64 + 5(18) = 249.5g/mol

Mass of CuSO4•5H2O from the balanced equation = 1 x 249.5 = 249.5g

Molar mass of H2O = (2x1) + 16 = 18g/mol

Mass of H2O from the balanced equation = 5 x 18 = 90g

From the balanced equation above,

249.5g of CuSO4•5H2O produced 90g of H2O.

Now, we can determine the mass of CuSO4•5H2O needed to produce 5g of H2O. This can be achieved as shown below:

From the balanced equation above,

249.5g of CuSO4•5H2O produced 90g of H2O.

Therefore, Xg of CuSO4•5H2O will produce 5g of H2O i.e

Xg of CuSO4•5H2O = (249.5 x 5)/90

Xg of CuSO4•5H2O = 13.9g

Therefore, 13.9g of CuSO4•5H2O is needed to produce 5g of H2O.

Answer:

Explanation:

a )

PbS      +     2PbO   →     3Pb    +     SO₂

                  2 mole       3 moles       1 moles

b )

2 moles of PbO is required to produce 3 moles of Pb

17 moles of PbO is required to produce 3/2 x 17 moles of Pb

= 3/2 x 17 moles of Pb

= 25.5 moles of Pb .

c )

1 mole of  SO₂ needs 2 moles of PbO

27.3 mole of  SO₂ needs 2 x 27.3  moles of PbO

PbO needed = 2 x 27.3 moles

= 54.6 moles .

d )

PbS      +     2PbO   →     3Pb    +     SO₂

1 mole       2 mole    

1 mole  of  PbS requires 2 moles of PbO

17.6 mole  of  PbS requires 2 x 17.6  moles of PbO

PbO required = 2 x 17.6 moles

= 35.2 moles .

PbO available = 36 moles . So PbO is in excess .

Hence PbS is the limiting reagent .

True, acid deposition is a bigger term used to describe acid rain.

Acid rain is rain or every other form of precipitation this is unusually acidic, which means that it has improved stages of hydrogen ions. maximum water, along with consuming water, has an impartial pH that exists between 6.5 and 8.5, however acid rain has a pH degree decrease than this and stages from four-five on common. The damage to humans from acid rain isn't always direct.

Acid rain is one of the consequences of air pollutants. Gases produced from the burning of fuels react with the oxygen in the air and water vapor, transforming into acids that fall onto the earth's floor as rain.

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Answer:

True

Explanation:

The approximate temperature of the H₂O after thermal equilibrium was reached is 23.4°C (option d).

The amount of heat absorbed by the water is given as 300.0 J. The mass of water is 50.0 g and the specific heat capacity of water is 4.2 J/g°C. Let's use the equation:

Q = m * c * ΔT

where Q is the heat absorbed, m is the mass of the water, c is the specific heat capacity of water, and ΔT is the change in temperature.

Substituting the given values, we get:

300.0 J = 50.0 g * 4.2 J/g°C * ΔT

Solving for ΔT, we get:

ΔT = 300.0 J / (50.0 g * 4.2 J/g°C) = 1.43°C

The final temperature of the water can be calculated by adding the change in temperature to the initial temperature:

Final temperature = 22.0°C + 1.43°C ≈ 23.4°C

Therefore, the approximate temperature of the H₂O after thermal equilibrium was reached is 23.4°C (option d).

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Answer:

Expof HCl are required to produce 7.50 moles of ZnCl2? 6. Copper ... When 9.34 g of zinc react with excess hydrochloric acid how many grams of zinc chloride will.lanation:

When (trans, trans)-hepta-3,5-dien-1-yne is reacted with Pd/C and H2, the product that is formed is (trans, trans)-hept-3-en-1-ol.

The reaction between the given compound and Pd/C and H2 undergoes catalytic hydrogenation or reduction. It is a type of chemical reaction in which an unsaturated bond present in a molecule is reduced by the addition of hydrogen gas (H2) with the help of a catalyst.

In this case, the given compound contains two triple bonds and no double bonds. So, it is known as diyne. When it is subjected to hydrogenation in the presence of a catalyst like Pd/C and H2, it undergoes hydrogenation and reduces its two triple bonds to double bonds. The two hydrogen atoms are added to each triple bond to form two single bonds.To write the balanced chemical equation for this reaction, we have:(trans, trans)-hepta-3,5-dien-1-yne + H2 (in presence of Pd/C) → (trans, trans)-hept-3-en-1-olHence, the final product formed when (trans, trans)-hepta-3,5-dien-1-yne is reacted with Pd/C and H2 is (trans, trans)-hept-3-en-1-ol.

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Answer:

beryllium phosphate

Explanation:

The name of the ionic compound Be3(PO4)2 B e 3 ( P O 4 ) 2 is beryllium phosphate

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The element in group 2 4th period is Calcium and it's Electronic configuration is - \(1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 4s^{2}\).

How to find the noble gas configuration?

Sharing valence electrons is all that is necessary to create a noble gas electron configuration. The atom will most likely give away its remaining electrons and turn into an electrically charged ion if it receives less than four. It will share the electrons and reach noble gas configuration if it gets more than 4.

Step 1 -For finding block:

​:- See the block in which the last electron enters. The element will belong to that block.

For finding period:

:- Highest value of the principal quantum no. will denotes the period no.

Afbau Principle:

​:- 1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s 4f 5d 6p 7s 5f 6d 7p 8s

Step 2 -Since element is in group, therefore last electron will enter into s-block and since it is in 4th period, therefore highest value of principal quantum number is 4

Element is Calcium

Electronic configuration - \(1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 4s^{2}\)

Therefore the element is calcium.

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Answer:

36 eggs

Explanation:

12 eggs in each carton

12 + 12 + 12 = 36 eggs

or 3 * 12 = 36 eggs

Hope this helps, have a nice day/night! :D

The type of reaction represented by Ba(ClO3)2 → BaCl2 + 3O2 is a decomposition reaction, in which Ba(ClO3)2 undergoing decomposition by releasing oxygen gas.

A decomposition reaction is a type of chemical reaction where a single compound breaks down into two or more simpler substances. In this reaction, the compound Ba(ClO3)2 decomposes into two simpler substances: BaCl2 and O2.

Ba(ClO3)2 is barium chlorate, which consists of barium ions (Ba2+) and chlorate ions (ClO3-). During the decomposition reaction, the compound breaks apart into BaCl2, which contains barium ions (Ba2+) and chloride ions (Cl-), and O2, which represents oxygen gas.

The balanced chemical equation for the decomposition reaction is:

2 Ba(ClO3)2 → 2 BaCl2 + 3 O2

This equation indicates that two molecules of Ba(ClO3)2 decompose to form two molecules of BaCl2 and release three molecules of O2 gas.

The reaction Ba(ClO3)2 → BaCl2 + 3O2 represents a decomposition reaction. In this reaction, the compound Ba(ClO3)2 breaks down into BaCl2 and releases oxygen gas (O2).

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There are approximately 3.225 × 10^24 molecules of H2 in 120 liters of H2.

To determine the number of molecules of H2 in 120 liters of H2, we need to use Avogadro's number and the ideal gas law.

Avogadro's number states that there are 6.022 x 10^23 molecules in one mole of any substance.

Given that the volume is 120 liters, we need to calculate the number of moles of H2 using the ideal gas law:

PV = nRT

Where:

P is the pressure of the gas (not given)

V is the volume of the gas (in liters) = 120 L

n is the number of moles of gas (unknown)

R is the ideal gas constant (0.0821 L·atm/(mol·K))

T is the temperature of the gas (not given)

Since the pressure and temperature are not provided, we cannot calculate the number of moles of H2 directly.

However, we can use the relationship between volume and moles at STP ( molecules  and Pressure) to estimate the number of moles. At STP, one mole of any ideal gas occupies 22.4 liters.

Number of moles (n) = V/22.4 = 120 L / 22.4 L/mol = 5.36 moles (approx.)

Now, we can use Avogadro's number to calculate the number of molecules:

Number of molecules = Number of moles × Avogadro's number

Number of molecules = 5.36 mol × 6.022 × 10^23 molecules/mol

Number of molecules ≈ 3.225 × 10^24 molecules.

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Answer:

Potassium Sulfide

Explanation:

K is more reactive than Fe which means K displaces Fe from the equation

The  net ionic equation of the reaction is; \(Fe^{2+} (aq) + S^{2-} (aq) ---- > FeS(s)\)

When we talk about the  net ionic equation, we are talking about the equation that would show the ions that underwent a change in the reaction. These ions would differ from the spectator ions that did not undergo any change from left to write in the reaction.

In this case, we need to write to write the net reaction equation that would show the change that leads to the precipitation of the iron II sulfide as a solid from the solution.

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Answer: Isotopes

Explanation:

The atoms of a chemical element can exist in different types. These are called isotopes. They have the same number of protons (and electrons), but different numbers of neutrons. Different isotopes of the same element have different masses.

Hope this helps!

Answer:

18.782% is the correct percent

Answer:putis

Explanation:

ai domti now

The following chemical equations have been balanced using the appropriate coefficients.

Mg(OH)2 + NaCl → MgCl2 + 2NaOH

H2SO4 + BaCl2 → BaSO4↓ + 2HCl

AgNO3 + Fe(NO3)2 → AgFeO2↓ + 2NO3

Balancing chemical equations in chemistry involves adjusting the coefficients of the reactants and products in a chemical reaction so that the number of atoms of each element is equal on both sides of the equation.

Note: Never change the subscripts in a chemical formula to balance an equation. Only coefficients can be changed.

Mg(OH)2 + NaCl → MgCl2 + 2NaOH

H2SO4 + BaCl2 → BaSO4↓ + 2HCl

AgNO3 + Fe(NO3)2 → AgFeO2↓ + 2NO3

MgCl2 + 2NaOH → Mg(OH)2↓ + 2NaCl

3NaOH + Fe2(SO4)3 → Fe(OH)3↓ + 3Na2SO4

Pb(NO3)2 + 2KCl → PbCl2↓ + 2KNO3

MgSO4 + BaCl2 → MgCl2 + BaSO4↓

Cu(NO3)2 + 2KOH → Cu(OH)2↓ + 2KNO3

Al(OH)3 + NaOH → NaAlO2 + 2H2O

BaCO3 + H2SO4 → BaSO4↓ + CO2↑ + H2O

ZnCl2 + 2AgNO3 → 2AgCl↓ + Zn(NO3)2

BaSO4 + 2KOH → Ba(OH)2↓ + K2SO4

Fe(NO3)3 + 3KOH → Fe(OH)3↓ + 3KNO3

NaHCO3 + KHCO3 → NaKHCO3 + H2O + CO2↑

Ba(OH)2 + Na2CO3 → BaCO3↓ + 2NaOH

Al + H2SO4 → Al2(SO4)3 + H2↑

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The time period during which there is water in the tank can be described as (-∞, -8) ∪ (-5, 3). This means that there is water in the tank before 8 minutes have passed since the leak began and between 5 and 3 minutes before the present time.

The given function f(x) = -x^3 - 10x^2 - x + 120 represents the volume of water in the tank at a given time x (measured in minutes since the leak began). To determine the time period during which there is water in the tank, we need to find the values of x for which f(x) is greater than zero.

By analyzing the function and its graph, we can observe that f(x) is positive for values of x in the intervals (-∞, -8) and (-5, 3). This means that before 8 minutes have passed since the leak began and between 5 and 3 minutes before the present time, the volume of the tank is positive, indicating that there is water in the tank during those time periods.

Therefore, the time period during which there is water in the tank is (-∞, -8) ∪ (-5, 3).

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Answer:

H - Cl2 +NaBr -> Br2+2NaCl

Answer:

See below

Explanation:

Bohr Model

well-defined circular orbits like the solar system

Quatum Mechanical Model

Electrons do not travel around the nucleus in simple circular orbits.

electron clouds around the nucleus

Hydrochloric acid (HCl) is an Arrhenius acid. Option A is correct.

The Arrhenius theory of acids and bases, proposed by Svante Arrhenius, defines an acid as a substance that dissociates in water to produce hydrogen ions (H⁺), and a base as a substance that dissociates in water to produce hydroxide ions (OH⁻).

HCl is a strong acid that readily ionizes in water to release H+ ions. The dissociation reaction of HCl in water is as;

HCl + H₂O → H₃O⁺ + Cl⁻

In this reaction, HCl donates a hydrogen ion (H⁺) to water, resulting in the formation of hydronium ions (H₃O⁺). The chloride ion (Cl⁻) is the corresponding conjugate base.

On the other hand, AlCl₃ (aluminum chloride) and BCl₃ (boron trichloride) are not Arrhenius acids. They are both molecular compounds and do not dissociate in water to produce H⁺ ions. Instead, they can undergo other chemical reactions or interactions when dissolved in water.

Hence, A. is the correct option.

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--The given question is incomplete, the complete question is

"Which of the following is an Arrhenius acid A) HCl B) AlCl₃ C) BCl₃."--

The Arrhenius acid among the given options (HCl, AlCl3, and BCl3) is HCl.

To identify the Arrhenius acid among the given options (HCl, AlCl3, and BCl3), we need to determine which substance, when dissolved in water, releases hydrogen ions (H+).

HCl is hydrochloric acid, which is a strong acid and dissociates completely in water to release H+ ions. Therefore, HCl is an Arrhenius acid.

AlCl3 and BCl3 are not Arrhenius acids because they do not release H+ ions when dissolved in water. Instead, they form complex ions with water molecules.

Therefore, the Arrhenius acid among the given options is HCl.

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Answer:

Isotope 2

Explanation:

Isotope 2 is the most abundant. Its percent abundance is 78.68% which is the largest percentage, and therefore the most common of the isotopes presented.

Good luck!

Your answer is B

Sun and wind are considered renewable energy, meaning that it won't polute the Earth. And as far as I know, the Sun and wind can't really run out. So it can last a very long time!

Hope this helps!

-Daisuke

Answer:

D.) The nuclear model describes the atom as a dense, positive nucleus surrounded by a cloud of negative electrons.

Answer

The nuclear model describes the atom as a dense, positive nucleus surrounded by a cloud of negative electrons.

Below is the list of visible biotic and abiotic factors.

Biotic factors:

Abiotic factors:

The observed interactions of these factors are as follows:

Ecosystems refer to intricate systems within specific geographies where multiple living organisms coexist together with the physical environment surrounding them offering an ever-changing dynamic platform for growth and development.

The scale at which ecosystems exist holds no boundaries; they vary from tiny ponds to enormous forests exhibiting natural diversity at its finest form across land or body of waters alike habitats onto aerial settings.

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Answer:

3 - True

4 - True

5 - False

6 - False

Answer:

observation

Explanation: