Suppose one was doing this experiment in the real world and the stockroom ran out of NaCl solutions. Which other solutions of similar concentration could be used in place of NaCl(aq)

Answer:

The correct answer is - increase Florida's average income per person.

Explanation:

Kennedy Space Center established by NASA helped the boosting economy of Florida. Spaceport operations in Kennedy Space Center benefit Florida by a total economic impact of nearly $4 billion on Florida's economy.

This space center helped in the 7,639 jobs in 2018 and 2019 and 37 new space operation companies. These jobs increased Florida's average income per person above $91,000.

Answer:

pH = 4.25

Explanation:

A solution composed of a weak acid and its conjugate base is a buffer solution. To calculate the pH of a buffer solution we use the Henderson-Hasselbach equation:

pH = pKa + log ([conjugate base]/[weak acid]

In this case, we have the following data:

[conjugate base] = [sodium benzoate] = 0.230 M

[weak acid] = [benzoic acid] = 0.205 M

The pKa of benzoic acid is 4.2. So, we introduce the data in the equation:

pH = 4.2 + log (0.230 M/0.205 M) = 4.2 + 0.050 = 4.25

Answer:

It would be conduction.

Answer:

The correct answer is - C.  Increasing the concentration increases the reaction rate.

Explanation:

In the given question the data with change in different factors affect the rate of reaction differently as it alters the time it takes to complete reaction:

Conditions                            Reaction Time

Original                                  10 seconds

Higher concentration            5 seconds

Higher temperature              5 seconds  

Metal added                           5 seconds

As it is given above, time is decreased in each condition including in the case of increasing the concentration of the reactants which means the rate of reaction increases as well.

Explanation:

Sydney has been the work that is a great place 56 to be able and a day and day for a week or two types and we will have a very nice time of course but 6yy6667 has 7575665yy44y

Answer:

carbon

Explanation:

Atomic radius represents the distance from the nucleus to the outer shell of an element.

The element having the Smallest atomic radius  is Carbon. Hence. Option (3) is correct

The atomic radius of a chemical element is a measure of the size of its atom, usually the mean or typical distance from the center of the nucleus to the outermost isolated electron.

Atomic Radius Increases down the group.

All the given elements belongs to same group ie, 14th Carbon is the top most element of the group.

Therefore, The element having the Smallest atomic radius  is Carbon. Hence. Option (3) is correct

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Answer:

D

Explanation:

because alkanes don't dissolve in water. They are insoluble.

Answer:

32.7 g of Zn

Explanation:

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

Zn + 2HCl —> ZnCl₂ + H₂

From the balanced equation above,

1 mole of Zn reacted to produce 1 mole of H₂

Next, we shall determine the number of mole of Zn required to produce 0.5 mole of H₂. This can be obtained as follow:

From the balanced equation above,

1 mole of Zn reacted to produce 1 mole of H₂.

Therefore, 0.5 mole of Zn will also react to produce to 0.5 mole of H₂.

Thus, 0.5 mole of Zn is required.

Finally, we shall determine the mass of 0.5 mole of Zn. This can be obtained as follow:

Mole of Zn = 0.5 mole

Molar mass of Zn = 65.4 g/mol

Mass of Zn =?

Mass = mole × molar mass

Mass of Zn = 0.5 × 65.4

Mass of Zn = 32.7 g

Thus, 32.7 g of Zn is required to produce 0.5 mole of H₂.

Answer:

Temperature is a physical quantity that shows how hot and cold something is.

It is the sign of thermal energy, present in all matter, which is the source of the occurrence of heat, a flow of energy when a body is in contact with another that is colder or hotter. Temperature is measured with a thermometer.

Answer:

In order to balance the chemical equation, you need to make sure the number of atoms of each element on the reactants side is equal to the number of atoms of each element on the product side. In order make both sides equal, you will need to multiply the number of atoms in each element until both sides are equal.

Hope this helped you.

Answer:

98

Explanation:

I dont even know

Answer:

tungstun

Explanation:

Answer:

tungsten

Explanation:

strongest out of any natural metal (142,000 psi).

Answer:

at age 15 the BMR begin to gradually decrease

A diagram representing the levels of organization within an organism is X. The  level of organization is identified by X is tissue. Therefore, option 2 is correct.

The term "tissue" refers to a collection of cells or fluid that cooperate to carry out a particular function in the body. Examples of such cells include those found in the kidney, heart, or blood cells, which transport oxygen to and waste products away from the body's cells.

The Old French term tissue, which means "a ribbon, belt, or piece of woven stuff," is where the noun tissue originates. Tissue really means to "weave fabric strands" as a verb. Tissues are now thought of as the disposable paper used for packaging presents or blowing our noses.

They stand for a degree of cell differentiation and order in living things. The activities of tissues include respiration, digesting, and transportation. As a result, tissues are crucial for multicellular creatures.

Thus, option 2 is correct.

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Answer:

The appropriate answer is "342 g/mol".

Explanation:

Given:

Freezing point,

= 0.93°C

Kf,

= 1.86°C/m

Mass,

= 171

As we know,

⇒ [tex]Freezing \ point = Kf\times molality[/tex]

                     [tex]0.93=1.86\times molality[/tex]

             [tex]Molality=\frac{0.93}{1.86}[/tex]

                            [tex]=0.5 \ m[/tex]

Now,

⇒ [tex]Molality=\frac{moles \ of \ sugar}{mass \ of \ water}[/tex]

             [tex]0.5=\frac{moles \ of \ sugar}{0.01}[/tex]

    [tex]moles \ of \ sugar=0.0005 \ mol[/tex]

hence,

The molar mass of the sugar will be:

= [tex]\frac{mass}{moles}[/tex]

= [tex]\frac{171\times 10^{-3}}{0.0005}[/tex]

= [tex]342 \ g/mol[/tex]

Answer:

Number of mole of H₃PO₄ = 0.306 mole

Explanation:

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

Mass of H₃PO₄ = 30 g

Number of mole of H₃PO₄ =?

Next, we shall determine the molar mass of H₃PO₄. This can be obtained as follow:

Molar mass of H₃PO₄ = (3×1) + 31 + (4×16)

= 3 + 31 + 64

= 98 g/mol

Finally, we shall determine the number of mole in 30 g of H₃PO₄ as follow:

Mass of H₃PO₄ = 30 g

Molar mass of H₃PO₄ = 98

Number of mole of H₃PO₄ =?

Mole = mass / molar mass

Number of mole of H₃PO₄ = 30 / 98

Number of mole of H₃PO₄ = 0.306 mole

Answer:

1. 12 molecules

2. 10 grams

3. ?

Explanation:

for number one, you simply. multiblu the 02 by 6 an that is 12, the same goes for number two. now for the third one i di not know. i am sorry and i hope this helps.

Answer: The balanced equation is [tex]2SO_{2} + O_{2} + 2H_{2}O \rightarrow 2H_{2}SO_{4}[/tex].

Explanation:

A chemical equation which contains same number of atoms on both reactant and product side is called a balanced chemical equation.

For example, [tex]SO_{2} + O_{2} + H_{2}O \rightarrow H_{2}SO_{4}[/tex]

Here, number of atoms present on reactant side are as follows.

Number of atoms present on product side are as follows.

To balance this equation, multiply [tex]SO_{2}[/tex] by 2 and [tex]H_{2}O[/tex] by 2 on reactant side. Also, multiply [tex]H_{2}SO_{4}[/tex] by 2 on product side.

Hence, the equation can be re-written as follows.

[tex]2SO_{2} + O_{2} + 2H_{2}O \rightarrow 2H_{2}SO_{4}[/tex]

Now, the number of atoms present on reactant side are as follows.

Number of atoms present on product side are as follows.

Since, the atoms present on both reactant and product side are equal. Hence, the equation is now balanced.

Thus, we can conclude that the balanced equation is [tex]2SO_{2} + O_{2} + 2H_{2}O \rightarrow 2H_{2}SO_{4}[/tex].

Answer:

The needed heat is 47,65 Joules.

The number of Joules of heat is required to change the 21.1g of liquid water into steam at 100°C is 47686 Joules.

The latent heat of vaporization is defined as the amount of heat needed at a constant temperature for the conversion of a liquid at its boiling point to gas. The latent heat of vaporization is different for different liquids.

The particles of water vapor at 100°C  have more energy than that of liquid water. Because the extra energy is in the form of latent heat of vaporization. The word “latent” from the Latin word “latere" means to cover up or hide.

Given, the amount of water, m= 21.1 g

We know that, the heat of vapourization of water = [tex]2260 J/g[/tex]

The latent heat of vaporization (q) is calculated as:

q = mH

q = (21.1 g) × (2260J/g)

q = 47686 J

Therefore, the 47686 Joules are required to boil 21.1 g of water at a temperature of 100°C.

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Answer:

Option A. Substitution

Explanation:

To know which option is correct, let us define each option. This is illustrated below:

A substitution reaction is a reaction in which an halogen replaces hydrogen in a hydrocarbon to produce alkyl halide and the corresponding acid. For example:

RH + X₂ –> RX + HX

NOTE:

R => is an alkyl group

X => is an halogen (F₂, Cl₂, Br₂ or I₂)

Addition reaction is a reaction in which two reactants combined to form a new compound without any loss of the reactants. This reaction is peculiar to only unsaturated hydrocarbon. For example:

CₓHᵧ + A₂ —> ACₓHᵧA

NOTE:

CₓHᵧ => unsaturated hydrocarbon (alkene, alkyne)

A₂ => halogen (F₂, Cl₂, Br₂ or I₂) or HBr, HCl etc

Esterification is a reaction involving carbonxylic and alcohol to produce ester and water. For example:

RCOOH + HOR —> RCOOR + H₂O

NOTE:

R => is an alkyl group

Polymerization is a process of reacting smaller molecules called monomers to form a larger molecule called polymer.

With the information provided above, we can see that the reaction:

CH₄ + Br₂ —> CH₃Br + HBr

Is a substitution reaction since Br replaces H in CH₄ to produce CH₃Br and the corresponding acid i.e HBr

Answer: The spacecraft traveled 345 km during the given time.

Explanation:

To calculate the distance of spacecraft, we use the equation:

[tex]\text{Velocity}=\frac{\text{Distance}{\text{Time}}[/tex]

We are given:

Velocity = 2.3 km/sec

Time = 2.5 mins = 150 sec             (Conversion factor: 1 min = 60 sec)

Putting values in above equation, we get:

[tex]\text{Distance}=(2.3km/s\times 150s)=354km[/tex]

Hence, the spacecraft traveled 345 km during the given time.

Answer:

0.46 L

Explanation:

In order to solve this problem we need to keep in mind the following definition of molarity:

We now input the given number of moles and molarity:

And calculate how many liters are required:

Answer:

The answer is "[tex]20 \ mL[/tex]"

Explanation:

Given:

Molarity= number of moles

because it is 1 Liter

[tex]\to \frac{0.03\ moles}{1.5 moles}=0.02\ L= 20 \ mL \ of\ Tris\\\\[/tex]

therefore,

it takes 20 mL of Tris.

[tex]\to \frac{0.150 \ moles}{5\ moles} =0.03\ L\\\\[/tex]

                     [tex]= 30 \ mL \ of\ Nacl[/tex]

So, take [tex]20 \ mL\ of\ NaCl.[/tex]

Answer: FRACTIONAL DISTILLATION separation method

Explanation:

The process by which esters are synthesized involves the reaction between a carboxylic acid and an alcohol. During this process, an excess of one of the reactants which is carboxylic acid is used. This helps to increase the rate of the chemical reaction thereby moving the equilibrium constant of the reaction towards the products.

Excess carboxylic acid mixed with the product of the reaction which is an ester can be separated using FRACTIONAL DISTILLATION separation method. This is a separation method that is used for separation of liquids with close boiling points. Example include components of petroleum, alcohol and water solutions, mixture of esters and carboxylic acids.

The process involves the introduction of a fractionating column between a flask and a condenser. The flask, which contains the impure mixture to be separated, is heated. The vapour of the liquids move into the fractionating column and they are cooled by the glass surface. The liquid with the higher boiling point (less volatile) condenses and falls back into the flask. While the one with the lower boiling point ( more volatile) distils over into the condenser and is collected as the first distillate. The esters has lower boiling point than carboxylic acids, therefore they are collected as the first distillate.

Answer:

Draw a structural formula for the organic anion (i.e., do not include NH4 ) formed when propanal is reacted with Tollens reagent. Don't forget the charge on the ion.

Explanation:

Aldehydes on reaction with Tollen's reagent(ammonical silver nitrate solution) form carboxylic acids.

The anion formed is a carboxylate ion.

The entire chemical reaction is shown below: