A hot air balloon is filled to 1250 m3 at 27 C. At what temperature will the balloon be filled to 1600 m3 if the pressure remains constant?

Please help!!

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

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1. Na is metal

Ge is Metalloid

Si is  Metalloid

Br is Nonmetal

Ag is Metal

2. Each element is composed of indestructible particles called atoms.

3. Positive and negative charges attract.

Chemistry is the scientific study of the properties and behavior of matter. It is a natural science that covers the elements that makeup matter to the compounds composed of atoms, molecules, and ions: their composition, structure, properties, behavior, and the changes they undergo during a reaction with other substances.

In the scope of its subject, chemistry occupies an intermediate position between physics and biology.  It is sometimes called the central science because it provides a foundation for understanding both basic and applied scientific disciplines at a fundamental level. For example, chemistry explains aspects of plant growth (botany), the formation of igneous rocks (geology), how atmospheric ozone is formed and how environmental pollutants are degraded (ecology), the properties of the soil on the moon (cosmochemistry), how medications work (pharmacology), and how to collect DNA evidence at a crime scene (forensics).

Chemistry addresses topics such as how atoms and molecules interact via chemical bonds to form new chemical compounds. There are two types of chemical bonds: 1. primary chemical bonds—e.g., covalent bonds, in which atoms share one or more electron(s); ionic bonds, in which an atom donates one or more electrons to another atom to produce ions (cations and anions); metallic bonds—and 2. secondary chemical bonds—e.g., hydrogen bonds; Van der Waals force bonds; ion-ion interaction; ion-dipole interaction.

Learn more about Chemistry

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Answer:

=  0.238 L

Explanation:

From the given information:

To convert cm³ to L(liter), we utilize the advent of a unit fraction that comprises a liter in the upper part of the fraction(numerator) and a cubic centimeter in the lower part of the fraction(denominator)

Recall that:

1000 cm³ = 1 liter

∴

238.0 cm³ = [tex]\dfrac{238.0 \ cm^3}{1} \times \dfrac{1 \ L}{1000 \ cm^3}[/tex]

=  0.238 L

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:

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:

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 mass of water produced is 180.02 g

Explanation:

The number of moles is defined as the ratio of the mass of a substance to its molar mass.

The equation used is:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] ......(1)

Given mass of HF = 600.0 g

Molar mass of HF = 20.01 g/mol

Plugging values in equation 1:

[tex]\text{Moles of HF}=\frac{600.0g}{20.01g/mol}=29.98 mol[/tex]

The given chemical equation follows:

[tex]SiO_2+6HF\rightarrow H_2SiF_6+2H_2O[/tex]

By the stoichiometry of the reaction:

If 6 moles of HF produces 2 moles of water

So, 29.98 moles of HF will produce = [tex]\frac{2}{6}\times 29.98=9.99mol[/tex] of water

Molar mass of water = 18.02 g/mol

Plugging values in equation 1:

[tex]\text{Mass of water}=(9.99mol\times 18.02g/mol)=180.02g[/tex]

Hence, the mass of water produced is 180.02 g

Answer:

a. 1.0 × 10⁻⁶ M (≈ 10⁻⁶ M)

Explanation:

Step 1: Given data

pOH of the solution: 6.0

Step 2: Calculate the concentration of hydroxide ions ([OH⁻]) in the solution

We will use the definition of pOH.

pOH = -log [OH⁻]

[OH⁻] = antilog -pOH

[OH⁻] = antilog -6.0

[OH⁻] = 1.0 × 10⁻⁶ M

Since [OH⁻] > 10⁻⁷ M, we can conclude that the solution is basic.

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:

2NO(g) + O2(g) ==> 2NO2(g) ... balanced equation

From this balanced equation we see that 2 moles NO reacts with 1 mole O2. At constant pressure and temperature, we can also say that 2 liters of NO reacts with 1 liter of O2. Then we can determine volume of O2 needed to react with 4.8 L of NO as follows:

4.8 L NO x 1 L O2 / 2 L NO = 2.4 L of O2 required

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: How much heat it takes to raise the temperature

Explanation:

a pex

Answer:

CARBON 14 INCLUDES:

-six protons

-eight neutrons in the nucleus

CARBON 12 INCLUDES:

-six protons

-Six neutrons

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.

Answer:

97.8 C

Explanation:

Recall the equation for specific heat:

q = mcΔT

There are several things to know in order to answer this question:

1. Whatever heat energy one object gains is the same as the heat energy the other has lost (conservation of energy).

2. Since one substance loses heat and the other gains heat, you need to multiply one side by -1 to account for the opposite direction of heat transfer.

3. The final temperature of both substance will be the same (zeroth law of thermodynamics)

Below, the left side of the equation represents water and the right side represents zinc.

-1 x 200 x 4.184 x (T - 100) = 60 x 0.389 x (T - 20)

Solve this equation and you get T = 97.8.

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:

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:

D

Explanation:

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

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:

C and D- Ionic bonding

B- Metallic bond

Explanation:

They show ionic bonding through which metals bond.

B shows metallic bonding

Answer:

10.70grams

Explanation:

Density of a substance = mass/volume

At STP of a gas (standard temperature and pressure), the density of oxygen gas is 1.429 g/L

Hence, according to this question, in 7.49 L of oxygen gas, there would be:

Using D = m/V

1.429 = m/7.49

m = 1.429g/L × 7.49L

m = 10.70g

Answer:

It would be conduction.

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: The molarity of phosphoric acid is 0.05 M

Explanation:

A neutralization reaction is defined as the reaction in which an acid reacts with a base to form a salt and water molecule.

At equivalence, moles of acid becomes equal to the moles of base. The equation for the neutralization follows:

[tex]n_1M_1V_1=n_2M_2V_2[/tex]              ........(1)

where,

[tex]n_1, M_1\text{ and }V_1[/tex] are the n-factor, molarity and volume of acid that is [tex]H_3PO_4[/tex]

[tex]n_2, M_2\text{ and }V_2[/tex] are the n-factor, molarity and volume of the base that is NaOH

Given values:

[tex]n_1=3\\M_1=?M\\V_1=10.00mL\\n_2=1\\M_2=0.1000M\\V_2=15.00mL[/tex]

Plugging values in equation 1:

[tex]3\times M_1\times 10.00=1\times 0.1000\times 15.00\\\\M_1=\frac{1\times 0.1000\times 15.00}{3\times 10.00}\\\\M_1=0.05M[/tex]

Hence, the molarity of phosphoric acid is 0.05 M

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]