4. A weather balloon containing 35.0 L of helium at 98.0 kPa is released and rises.
Assuming that the temperature is constant, fine the volume of the balloon when the
atmospheric pressure is 25.0 kPa at a height of about 25 km.

Crystals impurities are expected to have high solubility in cold solvents. Hence, option C is correct.

Cold solvent cleaning is a process used to remove grease, wax and other impurities from metal and other parts.

The process is also called degreasing. Cold solvents are sprayed onto the dirty part and it is brushed clean.

Once the filtration process is done the collected crystals should be washed with a little more ice-cold solvent to remove final soluble impurities which would otherwise be left on the surface of the crystals.

Hence, option C is correct.

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Answer:

Triple bonds; double bonds

Explanation:

Triple bonds; double bonds

0.903 mol of PCl₅ can be produced from 28.0 g of P₄ (and excess Cl₂).

Stoichiometry helps us to use the balanced chemical equation to measure the quantitative relationship and it is to calculate the amount of product and reactants that are given in a reaction.

The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.

Now write the balanced chemical equation

P₄ + 10 Cl₂ → 4PCl₅

1 mole of P₄ react with 10 mole of Cl₂ produces 4 moles of PCl₅.

According to Stoichiometry

[tex]\frac{n_{P_4}}{1} = \frac{n_{PCl_5}}{4}[/tex]

[tex]n_{P_4} = \frac{\text{Given Mass}}{\text{Molar mass}}[/tex]

      = [tex]\frac{28\ g}{124\ g/mol}[/tex]

      = 0.22580645161 mol

Now put the value in above equation

[tex]\frac{n_{P_4}}{1} = \frac{n_{PCl_5}}{4}[/tex]

[tex]\frac{0.22580645161}{1} = \frac{n_{PCl_5}}{4}[/tex]

[tex]n_{PCl_5} = 0.903[/tex] mol

Thus from the above conclusion we can say that 0.903 mol of PCl₅ can be produced from 28.0 g of P₄ (and excess Cl₂).

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We need to add 2.09 mL of concentrated acid to obtain 75 mL of 0.335 M HBr solution.

You are performing a dilution of HBr going from a concentration of 12M to 0.335M, and you want to end up with a final volume of 75 ml of the dilute solution.

Consider the dilution formula: M1V1 = M2V2.

The basis behind this formula is that the number of moles of the acid before and after the dilution must remain constant.

M1 = the molarity of the stock solution,

M2 = the molarity of the diluted solution,

V2 = the final volume of the diluted solution.

In this case, we need to determine V1, which is the volume of the stock solution used to prepare the diluted sample. With this knowledge, we can plug our numbers into the equation and we obtain the following:

(12 mol/L)*V1 = (0.335mol/L)*(0.075L).

Keeping in mind that molarity is the moles of a substance in one liter of solution, we will use mol/L instead of M. By doing this, we are reminded that in order to use this equation, we must convert 75 mL into units of liters.

After rearranging the equation and solving for V1, we find that V1 = 0.00209L.

Finally, we must convert back from liters to mL by multiplying the final answer by 1000.

This way we end up with V1 = 2.09 mL.

This means that we need to add 2.09 mL of concentrated acid to obtain 75 mL of 0.335 M HBr solution.

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Answer:

it's

answer

is

chlorinesodium gives sodium a different texture

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From the calculations, the volume of the solution is 0.25 L.

The term concentration refers to the amount of solute in a solution. It is obtained as the ratio of the number of moles and the volume.

Given that;

number of moles = 0.078 moles

concentration =  0.312 M

n = CV

V = n/C

V = 0.078 moles / 0.312 M

V = 0.25 L

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Answer:

2

Explanation:

The overall order of reaction  is 2.

The rate of reaction is the rate at which reactants are converted into products.

Now we have;

0.050/0.025 = k[0.4]^x [0.1]^y/k[0.2]^x [0.1]^y

2= 2^x

x = 1

Also;

0.075/0.025 = k[0.2]^x [0.3]^y/[0.2]^x [0.1]^y

3 = 3^y

y =1

Overall order of reaction =  x + y = 1 + 1 = 2

The overall order of reaction  is 2.

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Moles of ammonia is 2.4 moles

Molarity of solution after dilution is 2.4 M

Given:

volume of ammonia solution = 0.40 l

molarity of solution = 6.00 m

To Find:

moles of ammonia

Solution:

1 molar (M) solution will contain 1.0 GMW of a substance dissolved in water to make 1 liter of final solution

M = n / V

M is the molality of the solution that is to be calculated

n is the number of moles of the solute

V is the volume of solution given in terms of litres

n = M x V

= 6 x 0.4

= 2.4 moles

So moles of ammonia are 2.4 moles

molarity of the resulting solution after dilution

M = n/V

= 2.4/1

= 2.4 M

So Molarity after dilution will be 2.4 M

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M=n/V

M=(6.5/58.44) mol : 0.3 L

M=0.371

Answer:

.371 M

Explanation:

Molarity, M,  is calculated as  moles solute/ liters of solvent

6.5 gms of salt is    6.5 / 58.44 = .111225 moles

300 ml = .3 L

.111225 moles / .3 L =  .371 M

The answer to the question is 0.8055 as the answer should not include units in it.

Molarity (M) = n/v

n = moles of solute

v = liters of solution

According to question

1% solution → 1 gram of solute for 100 milliliters of solution

2% solution → 2 grams of solute for 100 milliliters of solution

6% NaClO solution → 6 grams of NaClO (solute) for 100 milliliters of solution

Molar mass of NaClO = (22.98 + 35.5 + 16)g/mol = 74.48 g/mol

Atomic mass of Na = 22.98 g/mol

Atomic mass of Cl = 35.5 g/mol

Atomic mass of O = 16 g/mol

1 mol NaClO = 74.48 grams NaClO

74.48 grams NaClO = 1 mol NaClO

6 grams NaClO = (1×6) / 74.48 mole = 0.08055 mole

As unit molarity is mole / liter

So 100 milliliters = 0.1 liters

1 liter = 1000 milliliters

100 milliliters = 100/1000 liters = 0.1 liters

Molarity of NaClO = moles of solute (NaClO) / liters of solution or volume of solution

Molarity of NaClO = 0.08055 / 0.1 mole/L =  0.8055 mole/L

As in question it is mentioned that 'Do not type units into your answer'

So, Molarity of NaClO in clorox bleach = 0.8055

Thus we find out the value of molarity of NaClO in Clorox bleach which came out to be 0.8055 as we dont have to give the answer with units.

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Answer:

NaCl + H²O

Double replacement

Answer:

Taking into account the definition of calorimetry, the specific heat of metal is 0.165 [tex]\frac{cal}{gC}[/tex].

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).

So, the equation that allows to calculate heat exchanges is:

Q = c× m× ΔT

where:

In this case, you know:

For metal:

For water:

Replacing in the expression to calculate heat exchanges:

For metal: Qmetal= Specific heat of metal× 50 g× (11.08 C - 45 C)

For water: Qwater=  1.035 [tex]\frac{cal}{gC}[/tex] × 250 g× (11.08 C - 10 C)

If two isolated bodies or systems exchange energy in the form of heat, the quantity received by one of them is equal to the quantity transferred by the other body. That is, the total energy exchanged remains constant, it is conserved.

Then, the heat that the gold gives up will be equal to the heat that the water receives. Therefore:

- Qmetal = + Qwater

- Specific heat of metal× 50 g× (11.08 C - 45 C)= 1.035 [tex]\frac{cal}{gC}[/tex] × 250 g× (11.08 C - 10 C)

Solving:

- Specific heat of metal× 50 g× (-33.92 C)= 1.035 [tex]\frac{cal}{gC}[/tex] × 250 g× 1.08 C

Specific heat of metal× 1696 g×C= 279.45 cal

Specific heat of metal= [tex]\frac{279.45 cal}{1696 gC}[/tex]

Specific heat of metal= 0.165 [tex]\frac{cal}{gC}[/tex]

Finally, the specific heat of metal is 0.165 [tex]\frac{cal}{gC}[/tex].

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Either a Pyrex measuring cup or a graduated cylinder can be used to measure the metric volumes of any liquid.

A graduated cylinder is also called a measuring cylinder and it can be defined as a narrow, cylindrical piece of laboratory equipment with marked lines, which are used to measure the volume of a liquid.

Generally, a student or researcher can use a Pyrex measuring cup to measure the metric volumes of any liquid when a graduated cylinder isn't available.

In conclusion, you should record your estimates and the actual measurements for all the containers that were used in your project.

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Answer:

The distributive property of multiplication is used when we need to multiply a number with the sum of two or more addends. The distributive property of multiplication is applicable to addition and subtraction of two or more numbers.

Hope its helpful!

Answer:

The distributive property of multiplication is used when we need to multiply a number with the sum of two or more addends. The distributive property of multiplication is applicable to addition and subtraction of two or more numbers.

Explanation:

Science is divided into various fields of study except for pseudoscience which is not based on the scientific method.

Science refers to the total body of knowledge obtained by applying the scientific method.

Science can be divided into physical sciences, mathematics, life sciences, and social sciences.

In conclusion, science is divided into various fields of study except for pseudoscience which is not based on the scientific method.

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Considering the definition of mole fraction, the mole fraction of each component in the solution is:

The molar fraction is a way of measuring the concentration that expresses the proportion in which a substance is found with respect to the total moles of the solution.

In this case, in first place you should know that the molar mass of each component is:

Now, the number of moles of each compound can be calculated as:

So, the total moles of the solution can be calculated as:

Total moles = 1.3125 moles + 0.2884 moles + 0.8333 moles

Total moles = 2.4342 moles

Finally, the more fraction of each component can be calculated as follow:

In summary, the mole fraction of each component in the solution is:

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The mass of sodium sulfite that was used will be 1,890 grams.

First, the equation of the reaction:

[tex]NaSO_3 + 2HCl --- > NaCl_2 + H_2O + SO_2[/tex]

The mole ratio of SO2 produced and sodium sulfite that reacted is 1:1.

Mole of 960 grams SO2 = 960/64 = 15 moles

Equivalent mole of sodium sulfite that reacted = 15 moles

Mass of 15 moles sodium sulfite = 15 x 126 = 1,890 grams

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The pH of hydrocyanic acid before and after the addition of sodium cyanide is 0.371 and 9.121

Calculation of pH of 720:

Given: Concentration of hydrocyanic acid (HCN) = 0.425 M

To find: pH

Reaction:

[tex]HCN \,\,\,\,\,\rightarrow \,\,\,\,\,\,H^+ + CN^-[/tex]

0.425M     0.425M

[tex]pH= -[logH^+]\\pH=-[log\,0.425]\\pH= 0.371[/tex]

pH after adding 0.249 mol of sodium cyanide (NaCN)

Pka of HCN= 9.21

Concentration of sodium cyanide = [tex]\frac{0.249}{0.720}\,M[/tex]

Concentration of NaCN= 0.346 M

According to Henderson–Hasselbalch equation:

[tex]pH= p_k_a + log\frac{salt}{acid}[/tex]

Putting the values in the above equation,

[tex]pH= 9.21 + log\frac{0.346}{0.425} \\\\pH= 9.21 - 0.089\\pH= 9.121[/tex]

Note: Pka value of HCN is assumed as 9.21

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Answer:

d. Transition metal

Explanation:

Copper is in transition metal block in periodic table.

Answer:

Copper belongs to the d. transition metal group.

Explanation:

Copper's d-shell is partially filled making it a transition metal. Copper is one of the few transition metals that has a set charge. Copper's charge is +2.

When referring to the periodic table, copper is in the middle section of the table which is the transition metals. It is between the metals and the non-metals.

It will take 1.254 billion years to reach 29% of the original amount of U-235.

The rate constant can be calculated from the half-life. The relationship of the two is shown below:

[tex]t_{0.5} =\frac{In 2}{k}[/tex]

[tex]k=\frac{In 2}{703}[/tex]

 [tex]= 9.86[/tex] × [tex]10 ^-^{4} my^{-1}[/tex]

The first-order integrated rate law of a nuclide undergoing radioactive decay is;

ln[A]_t = -kt + ln[A]_0.

[tex]ln 0.29 = ln1 - 9.86[/tex] × [tex]10^-^4[/tex] [tex]t[/tex]

[tex]ln0.29= -9.86[/tex] × [tex]10^-^4[/tex]

[tex]t=[/tex] [tex]1254.5 my[/tex]

It will take 1.254 billion years to reach to 29% of the original amount.

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Answer:

Homo means same

Hetero means different.

Homogeneous mixtures have one phase, it all looks the same, Fruit juice is homogeneous, solutions are homogeneous.

Heterogeneous mixtures have different phases, you can see the different parts, pepper is an example of a heterogeneous mixture.

In a homogeneous mixture the constituents are able to dissolve in each other due to their similar intermolecular forces, whereas in a heterogeneous mixture the constituents are not miscible- meaning they can't dissolve in each other.

To clarify: intermolecular forces describe the way that types of molecules will interact with each other. For instance, water (a polar molecule) and naphthalene (a non-polar molecule) are said to be "immiscible" because their intermolecular forces do not match. The saying goes: "like dissolves like". Meaning that molecules that have similar IFs will be mutually soluble (miscible, in other words).

The types of geological events or changes that occur at divergent plate boundaries are earthquakes and magma because there is a fault when two plates move away from each other.

The types of geological events or changes that occur at convergent plate boundaries are earthquakes, volcanoes, and the formation of mountains because the tectonic plates are moving towards each other.

The types of geological events or changes that occur at transform plate boundaries are shallow earthquakes, lateral displacement of rock, and a broad zone of crustal deformation.

These geological processes have changed the surface of the earth as they have helped to form ocean basins, and mountain chains, and the formation of glaciers and volcanoes, and earthquakes have changed the underground geology of the earth.

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Answer:

24.8 moles MgO

Explanation:

To find the number of moles produced, you need to multiply the mass (999 grams) by the molar mass of magnesium oxide. The molar mass is made up of the atomic weights of each element times their quantities in the molecule.

Molar Mass (MgO): 24.305 g/mol + 15.998 g/mol

Molar Mass (MgO): 40.303 g/mol

 999 g MgO              1 mole
--------------------  x  ----------------------  =  24.8 moles MgO
                                 40.303 g

Given :

Formula applied :

[tex]\boxed {Q = mc \triangle T}[/tex]

Let's solve for c !

⇒ 237,000 = 20 × c × 15

⇒ c = 237,000 ÷ 300

⇒ [tex]\boxed {c = 790 J kg^{-1} K^{-1}}[/tex]

∴ The specific heat capacity of granite is 790 J kg⁻¹ K⁻¹.

Answer:

Bronsted-Lowry's base is A)KOH

KOH

It is impossible to reach absolute zero because the magnitude of work that is required to remove energy from a gas in order to attain the absolute zero is so high.

The absolute zero is the temperature at which the movement of all the gas molecules is theoretically believed to cease. At the absolute zero, gas molecules remain at fixed positions because according to the third law of thermodynamics, the entropy of a perfectly ordered system is zero.

It is impossible to reach absolute zero because the magnitude of work that is required to remove energy from a gas in order to attain the absolute zero is so high such that it is impractical to attain the absolute zero.

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Charcoal is the sample of this drawing medium have been dated back to 30,000 BCE and is denoted as option B.

This is referred to a black carbon residue which is heated in insufficient oxygen to give it a light weight.

It is used for drawing and has been in existence for as long as 30,000 BCE hence the reason why it is the most appropriate choice.

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