4. What are the freezing and boiling points of water on the Fahrenheit scale? On the
Celsius scale?

The solubility of the salts is affected by the temperature changes. 1. NaCl is least affected by temperature. 2. supersaturated. 3. 60 grams KBr. 4. Ethanol has both polar and non-polar groups. 5. Mixing and shaking.

A KBr solution with 90 gm solute in 100 grams of water at 50 degrees is classified as supersaturated. 60 grams of KBr are needed to make a saturated solution in 100 gm of water at 30 degrees.

Ethanol is a general solvent due to the presence of both the polar and the non-Polar groups. As a result, it is easier to dissolve both polar molecules and non-Polar molecules. The dissolving rate can be increased by mixing or shaking the solution. Also, the sugar dissolves faster in hot than cold tea.

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Answer:

1.184 g

Explanation:

Answer:

B. Light waves or energy

Explanation:

Einstein argued that gravity isn't a force at all. He described it as a curvature of time and space caused by mass and energy.

Answer:

B) The density changed.

C) The salt dissolved in the water.  

E) The salt and the water can still be separated into their individual molecules

Explanation:

A physical change is a change that occurs in a substance which affects only the physical properties of that substance such as color, density, boiling o melting point, etc. In a physical change, the substance retains its chemical composition and no new substances are formed. The changes that occur can as well be reversed.

A chemical change is a change that occurs in a compound which affects or alters the chemical properties of that substance, hence transforming the substance into an entirely new substance different from the original substance. The changes that occur in a chemical change are not easily reversible.

In the given experiment, addition of salt to water results in the following changes:

Density is a physical property of a substance, and as the dissolved salt can be easily recovered from the salt solution solution by evaporation followed by condensation, the changes observed are physical changes.

Answer:

Add solute to liquid until dissolving stops.

Evaporate a solvent from a solution until the solute begins to crystallize or precipitate.

Add seed crystals to a solution that is supersaturated.

Answer:

1 - Gravitational.

2 - Normal

3 - Tension

4 - Frictional

5 - Centripetal

Explanation:

1. If you drop something, gravity pulls it down to the Earth, So falling towards the earth is gravity.

2. Pushing back on another object is normal, Newton's law: Every action has an equal and opposite reaction.

3. When two forces are pulled on opposite sides, the object must stretch which creates tension. Think of a rubber band. If it is pulled more than the object can stretch, it will tear. Tensile strength refers to how much pulling force an object can withstand before it tears.

4. When objects or molecules rub against other objects or molecules they create friction.

5. Last two options go together.

Answer:

acid and rain

Explanation:

acid rain

Answer:

acid rain is checimal reaction to sulfur dioxide and nitrogen oxides are released into the air. These substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain. Bascalliy it's because of sulfur dioxide and nitrogen

Explanation:

At 2861 degree Celsius the iron begins to boil. At 1,538 °C the substance begins to melt.

The melting point is the point at which the liquid and solid forms of a solid can exist in equilibrium. It can also be defined as the point at which a solid changes into a liquid under normal atmospheric pressure.

The equilibrium point at which water vapor, liquid water, and solid ice can exist in equilibrium is the only point at which the pressure and temperature of water vapor are the same. The equilibrium point of water vapor is the point at which the partial vapor pressure is the same as that of liquid water at the exact temperature of 273.1600 K.

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The final pressure of the gas of initial pressure 275 torr is 550 torr.

Pressure is the force acting normally per unit area to the surface of an object

To caluclate the final pressure of the balloon, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the final pressure is 550 torr.

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Explanation:

ionic

hope u likee it plz give thanks

Iron bromide is an ionic compound.

Ionic compounds are those compounds that are made by the combining of metal and nonmetals. Ionic compounds are neutral in nature because one positive element and one negative element are combined to form a neutral compound.

An example of an ionic compound is sodium chloride, in which sodium is positive and chloride is negative. Similarly, iron bromide in which iron is positive and bromine is a negative element and together make a compound that is a neutral compound.

Unlike this, covalent compounds are formed by the sharing of electrons. They are not neutral in nature, and they are the strongest compounds because covalent bonds are the strongest bonds.

Thus, Iron bromide is an ionic compound.

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Answer:

C. Matter

Explanation:

Using process of elimination

Rock and glass are non living things

Animals and plants Living things        

these cancel each other out I excluded wood be because this depends on whether or not the tree was harvested.

While atoms are in every thing, Matter is in any thing thing that takes up space whether it be air or a rock making it the best answer.

Answer:

\(0.5594\ \text{L}\)

Explanation:

Mol of NaI = 0.405 mol

Molarity of solution = 0.724 M

Molarity is given by

\(M=\dfrac{\text{mol}}{\text{Volume of solution in }NaI}\\\Rightarrow \text{Volume of solution in }NaI=\dfrac{0.405}{0.724}\\\Rightarrow \text{Volume of solution in }NaI=0.5594\ \text{L}\)

The required volume is \(0.5594\ \text{L}\).

Answer:

Zero

Explanation:

Hello,

The question require us to calculate the mass of nitrogen present in aluminium carbonate.

This can easily be calculated using Avogadro's number as a constant with some minor calculations but however in this case, we can't because there's no single atom of nitrogen present in aluminium carbonate hence we can't calculate the mass of nitrogen present in it.

Chemical formula of aluminium carbonate = Al₂(CO₃)₃.

From the above chemical formula, we can see that there's no single atom of nitrogen present in the formula hence the mass of nitrogen present in aluminium carbonate that contains 1.23×10²³ carbon atoms is zero.

Answer:

no. of moles = 0.0113

Explanation:

To calculate the number of moles of a substance given its concentration and volume, we can use the following formula:

\(\boxed{\mathrm{No. \ of \ moles = Concentration \times \frac{Volume}{1000}}}\),

where concentration is mole/dm³ or M, and volume is in cm³ or ml.

In this question, we are told that:

• concentration = 0.250 M

• volume = 45.0 ml

Substituting these values into the formula above, we get:

No. of moles = \(0.250 \times \frac{45.0}{1000}\)

                     = \(0.250 \times 0.045\)

                     = 0.01125

                     \(\approx\) 0.0113   (3 s.f.)

Therefore, the number of moles of C₂H₅OH is 0.0113.

The 0.0112 moles of C2H5OH are present in the 0.250 M solution of C2H5OH.

What is a mole?

Mole is used as a concentration unit in chemistry terms. One mole is equal to the mass of the given compound which is divided by the molar mass of the same compound.

Given:

M= 0.250M ( M stands for molarity)

Volume = 45.0 ml

The molar mass of  C2H5OH = 46.07 g/mol

Now, we use molarity formula M = Moles of the substance/volume in liter

Let say moles = x

Units of M = mol/L

Therefore, units of volume need to be converted in to Liters = 1L = 1000ml

By using molarity equation, X= 45.0*0.250/1000 = 0.0112 moles

Hence, the required number of moles of C2H5OH = 0.0112 moles.

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Calcium chloride, CaCl2, is a white, crystalline salt that is very soluble in water.

Calcium chloride is an inorganic compound, a salt with the chemical method CaCl 2. it is a white crystalline strong at room temperature, and it's miles exceptionally soluble in water.

Solubility is defined as the maximum amount of a substance in an effort to dissolve in a given quantity of solvent at a special temperature. Solubility is a characteristic asset of a particular solute-solvent combination, and special substances have significantly differing solubilities.

Solubility refers to the finest quantity of solute that may dissolve in a recognized quantity of solvent at a given temperature. In a solvent, an answer is a homogeneous mixture of one or more solutes. A not unusual instance of an answer is sugar cubes brought to a cup of tea or coffee.

Dissolution is the process where a solute in a gaseous, liquid or stable section dissolves in a solvent to shape an answer. Solubility is the maximum awareness of a solute that may dissolve in a solvent at a given temperature. at the most attention of solute, the solution is said to be saturated.

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Answer:

Neutrons and protons

Explanation:

The average atomic mass of an element is the sum of the masses of its isotopes, each multiplied by its natural abundance (the decimal associated with percent of atoms of that element that are of a given isotope).

Answer:

a) volume₁ = 444.6 L  

b) Volume₂ = 306 L  and percentage Error = 31.2%

Explanation:      

Given that;

the solution contains 35.0 wt% H₂SO₄

A quantity of the 35% solution is needed that contains 195.5 kg of H₂SO₄

Lets say mass of solution containing 195.5 kg H₂SO₄ is 'A' kg

Now since the question saysm it is a 35% wt solution,

so

(35/ 100) × Akg = 195.5kg

0.35A = 195.5

A = 558.6kg

So A = 558.6 kg

therefore mass of the  solution is 558.6kg

a)

also Specific gravity is 1.2563

since density of water = 1kg/ L

density of solution = SG of H₂SO₄ × density of water

therefore density of solution = 1.2563 ×1kg/ L  = 1.2563 kg/ L

Now to calculate the required volume (L) of the solution

we say;

Volume of solution = mass / density

Volume = 558.6kg / 1.2563kg/L

Volume₁ = 444.6 L  

b)

Now If pure-component specific gravity is to be used,

Specific Gravity = 1.8255

which means Density will be  = 1.8255 kg/ L

Therefore will be

Volume = 558.6kg / 1.8255kg/L

Volume₂ = 306 L

To calculate the error

we say volume₁ - volume₂

Error = 444.6L - 306L = 138.6

So

Percent error = ( 138.6L / 444.6L) × 100

percentage Error = 31.2%

Answer:

be at a pressure of 0.987 atm if the temperature remains constant? P, V₁ = P2 V2 ... A helium-filled balloon has a volume of 50.0L at 25.0°C and 1.08atm.

Explanation:

right

4) Ne

Chemistry

Atomic Structure

The most stable (unreactive) elements are found in group 18. They are known as the Noble Gases.

Noble Gases are inert, meaning they do not react easily with other elements. The reason is because their valence electron shells are filled.

Therefore, our best answer is 4) Ne.

Answer:

\(\boxed {\boxed {\sf 4. \ Ne }}\)

Explanation:

On the Periodic Table, the last group of elements are the Noble Gases. These are the most unreactive or stable elements.

According to the Octet Rule, atoms always want to have 8 valence electrons. The Noble Gases already satisfy this rule and have full outer shells, therefore they don't react with other elements often.

The Noble Gases are helium (He) , neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and oganesson (Og).

The only answer choice that is a Noble Gas is 4. Ne

Answer:

A search warrant is a document that is signed by the district attorney, and authorizes the search of a building for the purpose of collecting evidence at a crime scene.

Answer:

3.01 × 10^24 particles

Explanation:

According to Avagadro, in one mole of a substance, there are 6.02 × 10^23 atoms or particles.

Using the formula: N = n × NA

Where;

N= number of particles or atoms

n = number of moles

NA = Avagadro's constant or number

This means that for 5 moles of a substance, there will be:

5 × 6.02 × 10^23

= 30.1 × 10^23

= 3.01 × 10^24 particles

The final temperature of water and aluminum will be 27.2 °C., after they are allowed to come to thermal equilibrium.

Here,

a)  According to first law of thermodynamic the energy is conserved.

b)  In an insulated system there is no loss of heat

So, Heat lost by aluminum will be equal to heat gained by water

c)  At thermal equilibrium the, final temperature of water will be equal to final temperature of aluminium

Formulae:

Heat gain or loss = m×Cs×ΔT,

where m = mass of the substance,

Cs is the specific heat of the substance,

ΔT is the change in temperature

mass of  aluminum, Ma = 15.7g

Temprature of aluminium  = 53.2 °C

mass of  water, Mw = 32.5 g

Temrature of water= 24.5°C

Known values:

Specific heat liquid water: Cs = 1 cal/g°C

Specific heat aluminum: Cs = 0.215 cal/g°

So Calculation will be done,

Heat of aluminium = Heat of water

Heat of water = m Cs ΔT = 32.5g × 1× (T - 24.5)

Heat of aluminium = m  CsΔT = 15.7× (0.215) (53.2 - T)

32.5 (1 ) (T  - 24.5) = 15.7 (0.215) (53.2 - T)

 32.5T - 796.25 = 179.576 - 3.375T

35.8755Tf = 975.8266

T = 27.2°C  

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Your question is incomplete, for full question refer below:

A 15.7 g aluminum block is warmed to 53.6 ∘C is  plunged into an insulated beaker containing 32.5 g of water initially at 24.5 ∘C. The aluminum and the water are then allowed to come at thermal equilibrium.

Assuming that no heat is lost in the process, Determine is the final temperature of the water and aluminum?

The resolution of the monochromator is 3.6nm

A monochromator is an optical device that is used to isolate a specific wavelength or range of wavelengths of light from a broader spectrum of light. It is typically used in spectroscopy, where the goal is to measure the intensity of light at a specific wavelength or over a range of wavelengths.

The resolution of a monochromator, Δλeff, is given by the equation: Δλeff = (D^-1) * (exit slit width)

Plugging in the given values:

Δλeff = (1.8 nm/mm) * (500 micrometers)

Converting micrometers to millimeters:

Δλeff = (1.8 nm/mm) * (0.5 mm)

Δλeff = 3.6 nm

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The compound that is shown as X can be seen in the option labelled C

The process of esterification involves the condensation of an alcohol (or phenol) with an acid to produce an ester. To create the ester bond, the water molecule must be removed from the alcohol and acid (dehydration).

Usually, an acid catalyst is used to catalyze the reaction, which makes it easier to remove water and encourages the creation of the ester. The acid catalyst aids in protonating the acid's carbonyl oxygen, which increases its electrophilicity and makes it more vulnerable to alcohol's nucleophilic attack.

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Answer:

123 g

Explanation:

First, we convert 10.0 dL into mL, keeping in mind that:

Now we can multiply the density by the volume in order to calculate the mass:

10.0 dL of a substance with a density of 0.123 g/mL would weigh 123 grams.

There are 3.44 x 10^{22} particles in 0.057 moles of lithium bromide.

The lithium bromide formula also known as the lithium monobromide formula or Bromo lithium formula is explored. It is a counterion bromide-based salt of lithium.

we have to use Avogadro's constant,

Avogadro's constant, is approximately equal to 6.022 x 10^{22} particles per mole.

we can use the following formula:

number of particles = moles x Avogadro's constant

Substitute the values,

number of particles = 0.057 moles x 6.022 x 10^{23} particles/mol

Simplifying the equation

number of particles = 3.44 x 10^{22} particles

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Q = Ksp = 1 × 10^(-12).

Substituting the values into the Nernst equation, we have:

0.799 V = E° - (RT/2F) * ln(1 × 10^(-12))

Now, solving for E°:

E° = 0.799 V + (RT/2F) * ln(1 × 10^(-12))

The value of R is the ideal gas constant, T is the temperature in Kelvin, and F is the Faraday constant.

To find the standard reduction potential at 25°C for the half-reaction Ag2CrO4(s) + 2e¯ → 2Ag(s) + CrO4²-(aq), we can use the Nernst equation, which relates the standard reduction potential (E°) to the equilibrium constant (K) and the reaction quotient (Q).

The Nernst equation is given as follows:

E = E° - (RT/nF) * ln(Q)

Given information:

Ksp = 1 × 10^(-12)

E = +0.799 V (standard reduction potential of Ag+ to Ag)

Since the reaction involves the dissolution of Ag2CrO4(s), the reaction quotient Q can be expressed as [Ag+]²/[CrO4²-].

Since the stoichiometry of the reaction is 2:1 for Ag2CrO4 to Ag+, we can say that [Ag+]² = Ksp.

Therefore, Q = Ksp = 1 × 10^(-12).

Substituting the values into the Nernst equation, we have:

0.799 V = E° - (RT/2F) * ln(1 × 10^(-12))

Now, solving for E°:

E° = 0.799 V + (RT/2F) * ln(1 × 10^(-12))

The value of R is the ideal gas constant, T is the temperature in Kelvin, and F is the Faraday constant.

Please note that without specific values for temperature (T) and the ideal gas constant (R), the exact standard reduction potential at 25°C cannot be determined.

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