What’s the answer????

Answer:

Thegas should be cooled to -136.5°C.

Explanation:

Volume of a gas is directly proportional to its temperature on the kelvin scale. This is called Charles' law.

Initially, the gas had a volume of 3.0 L at 0°C(273 K).

We have to have the temperature at which the volume of the gas will be 1.5 L.

Let V1=3 L, T1=273 K, V2=1.5 L, T2=?

By Charles' law,

V1/T1=V2/T2

T2

=(V2×T1)/V1

=(1.5 L×273K)/3L

=136.5 K

=(136.5-273)°C

= -136.5 °C

The impure substance will crystallize in a purer form because the impurities won't crystallize eventually, therefore leaving the impurities behind in the solution.

Recrystallization is a considerably crucial technique for purifying nonvolatile organic solids. Recrystallization implicates dissolving the material to be purified in a relevant hot solvent. As the solvent cools, the solution evolves saturated with the solute and the solute crystallizes out. The compound is dissolved in the solvent, the solution is purified to deduct the insoluble impurities, and the solvent is evaporated to create the solid compound. The insoluble impurities are left behind in the filter paper.

To learn more about recrystallization visit here:

https://brainly.com/question/30701380

#SPJ4

Answer:

Plank length

Explanation:

The smallest possible size for anything in the universe is the Planck Length, which is 1.6 x10-35 m across.

The compound you provided, (Mg,Fe2+)2(Mg,Fe2+)5Si8O22(OH)2, is known as amphibole.

Amphibole is a group of rock-forming minerals that share a similar crystal structure characterized by a double chain of silica tetrahedra. The specific mineral within the amphibole group can vary based on the composition of the cations present.

The formula you provided indicates the presence of magnesium (Mg) and iron (Fe2+) cations in the mineral. The numbers in parentheses indicate the varying ratios of magnesium and iron in the mineral composition.

Amphibole minerals are typically found in igneous and metamorphic rocks and have a wide range of colors, including black, brown, green, and white. They are commonly identified by their elongated crystal habit and characteristic cleavage angles. Some well-known examples of amphibole minerals include hornblende and actinolite.

It's important to note that the specific name of the compound can vary depending on the exact composition and structure of the amphibole mineral. The formula you provided represents a general formula for amphibole minerals rather than a specific mineral name.

To learn more about amphibole Click Here: brainly.com/question/29460504

#SPJ11

The volume of HCl gas required to prepare 11.6 moles/liter of concentrated hydrochloric acid is 26.99 litres.

The volume of hydrochloric acid (HCl) gas required to prepare a certain concentration of hydrochloric acid,calculate the moles of HCl required.

The concentration of hydrochloric acid is given as 11.6 moles/liter.

Therefore, for a given volume of the solution, we can calculate the number of moles of HCl required by multiplying the volume of the solution (V) by 11.6 moles/liter.

Using the Ideal Gas Law, we can calculate the volume of HCl gas (Vg) required to produce the desired concentration of HCl:

Vg = (nRT) / P

Where:

n = number of moles of HCl (calculated above)

R = gas constant (0.0821 L atm/mol K)

T = temperature (25 °C = 298 K)

P = pressure (1 atm)

Therefore, the volume of HCl gas required to prepare 11.6 moles/liter of concentrated hydrochloric acid is:

Vg = (11.6 * 0.0821 * 298) / 1 = 26.99 liters

In conclusion, to prepare a concentrated hydrochloric acid solution of 11.6 moles/liter at 25 °C and 1 atm pressure, you need to dissolve 26.99 liters of HCl gas in water.

to know more about hydrochloric acid refer here:

https://brainly.com/question/15231576#

#SPJ11

Answer:

160.32 grams of Ca or 160 if rounded

Explanation:

Multiply moles of Ca by the conversion factor (molar mass of calcium) 40.08 g Ca/ 1 mol Ca, which then allows the cancelation of moles, leaving grams of Ca.

4 mol*40.08g/mol = 160.32 grams of Ca

please give thanks by clicking heart button :)

Answer:

\(\boxed {\boxed {\sf 160.32 \ g, \ 160 \ g, \ or \ 200 \ g }}\)

Explanation:

To convert from grams to moles, we must use calcium's molar mass, which can be found on the Periodic Table of Elements.

Now, we can use the molar mass as a ratio or fraction.

\(\frac{40.08 \ g \ Ca}{1 \ mol \ Ca}\)

This fraction can be multiplied by the number of moles, which is 4.

\(4 \ mol \ Ca * \frac{40.08 \ g \ Ca}{1 \ mol \ Ca}\)

When we multiply, the moles of calcium will cancel each other out.

\(4* \frac{40.08 \ g \ Ca}{1}\)

Since the fraction is over 1, we can just remove the denominator and write a simply multiplication equation.

\(4* 40.08 \ g \ Ca\)

\(160.32 \ g \ Ca\)

Depending on the teacher's instructions, the answer can be left as is or rounded.

If we round to the technically correct number of significant figures, it would be 1, because the original measurement of 4 moles has 1 sig fig. This would 200 grams, but that's a large amount to round.

We could also round to the nearest whole number. The 3 in the tenth place tells us to leave the whole number as it is. This would be 160 grams.

The answer could be 160.32 grams, 160 grams, or 200 grams, depending on rounding and significant figures.

Answer:

Viewed simply, electrons are arranged in shells around an atom's nucleus. Electrons closest to the nucleus will have the lowest energy. Electrons further away from the nucleus will have higher energy. ... In a more realistic model, electrons move in atomic orbitals, or subshells.

Explanation:

Viewed simply, electrons are arranged in shells around an atom's nucleus. Electrons closest to the nucleus will have the lowest energy. Electrons further away from the nucleus will have higher energy. ... In a more realistic model, electrons move in atomic orbitals, or subshells.

Answer:

No, because the number of carbon, hydrogen & oxygen atoms on both sides of the equation are not equal.

Explanation:

For an equation to be completely balanced, there should be equal number of reactants and products.

Number of carbon atoms on reactant side = 16

Number of hydrogen atoms on reactant side = 16

Number of oxygen atoms on reactant side = 50

Number of carbon atoms on product side = 8

Number of hydrogen atoms on product side = 36

Number of oxygen atoms on product side = 34

Therefore, we can conclude that total number of reactants does not equal total number of products therefore, this equation is not completely balanced.

[RevyBreeze]

Answer:

they have the same structures in common

Answer:

hydroxide is the one because it is the one HAHAH

Answer:

hydroxide, OB

Explanation:

hydroxide,OB

Answer:

12 atm

Explanation:

First, let us convert Celcius into Kelvin: 28.0 °C = 301.15 K and 129.0 °C = 402.15 K

For this question we must employ the Combined Gas Law: \(\frac{P_1V_1}{P_2V_2}=\frac{n_1RT_1}{n_2RT_2}\), where \(P_1\) is the initial pressure and \(P_2\) is the new pressure.

We know that intitially, P=9 atm, V=30 L, and T=301.15K. From our problem, only temperature and pressure changes, while the number of moles, volume and the gas constant, R, stay the same, so they are irrelevant.

Thus, the filled out Combined Gas Law would be:

\(\frac{9 atm}{P_2}\)=\(\frac{301.15K}{402.15K}\), where the volume, moles of gas, and R are cancelled out.

We can manipulate this equation to derive the new pressure. We find that

9atm≈0.74885\(P_2\).  

This means that

\(P_2\)≈9/0.74885≈12 atm

Answer:

c. density

hope this helps :)

Explanation:

Answer:

Answer:

The letters, s, p, d, and f designate the shape of the orbital. (The shape is a consequence of the magnitude of the electron's angular momentum, resulting from its angular motion.) An s orbital is spherical with its centre at the nucleus.

Answer:

(CH3COO)2 + redP + Cl2 → ClCH2COOH + HCl

Explanation:

This is an example of halogenation of carboxylic acids at alpha carbon atom. In this reaction, red phosphorus and chlorine are treated with carboxylic acids having alpha hydrogen atom followed by hydrolysis to form alpha chloro carboxylic acid.

Answer:

H2 and O2

Explanation:

A coffee cup calorimeter is basically a type of calorimeter that operates at constant pressure. The heat measured in the calorimeter is equal to the change in enthalpy of the reaction.

This type of calorimeter is apt for reactions involving solutions where there is little or no change in volume.

It is not generally applicable to gas phase reactions such as the reaction between H2 and O2.

Answer:

You will not measure the enthalpy of the reaction of

✔ H2 and O2

in the coffee cup calorimeter because this reaction involves gases. Instead, you will use a well-known published value.

C. H2 and O2

Is Correct

Answer:

where is the question here

The refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

To calculate the kilowatt-hours (kWh) of electric energy used by the refrigerator in 30 days, we need to multiply the power rating by the total running time.

Given:

Power rating of the refrigerator = 500 W

Running time per day = 12 hours

Number of days = 30

First, we need to convert the power rating from watts to kilowatts:

Power rating = 500 W / 1000 = 0.5 kW

Next, we calculate the total energy used in kilowatt-hours (kWh) over the 30-day period:

Energy used = Power rating × Running time × Number of days

Energy used = 0.5 kW × 12 hours/day × 30 days

Energy used = 180 kWh

Therefore, the refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

For more question on energy

https://brainly.com/question/29339318

#SPJ8

Answer:

Explanation:

4

28.5 J is the amount of energy transferred to the coin.

The specific heat capacity is defined as the quantity of heat (J) absorbed per unit mass (kg) of the material when its temperature increases by 1 K (or 1 °C), and its units are J/(kg K) or J/(kg °C).

Energy is calculated mCΔT formula  where,

m(mass)= 6.30  grams

C(specific heat capacity)= 0.377 j/g

ΔT(change in temperature)= 32.0°C- 20°C= 12 °C

Energy is, therefore:

Q = mCΔT

Q= 6.30 g  x 0.377  j/g /°C x   12 °C

Q= 28.5 J

Hence, 28.5 J is the amount of energy transferred to the coin.

Learn more about the specific heat capacity here:

https://brainly.com/question/1747943

#SPJ1

Answer:

28.5 J is which what is the amount of energy transferred or given to the coin.

Explanation:

Have a great rest of your day
The one and only
Mr. Universe

Answer:

the volume should be in cubic cm so I assumed that you wanted to write the same . then the answer is 5489.07 kg/m^3

Answer:

\(\boxed {\boxed {\sf d\approx5.49 \ g/cm^3}}\)

Explanation:

Density can be found by dividing the mass by the volume.

\(d=\frac{m}{v}\)

The mass of the rock is 555 grams and the volume is 101.1 cubic centimeters.

\(m=555 \ g \\v= 101.1 \ cm^3\)

Substitute the values into the formula.

\(d=\frac{555 \ g}{101.1 \ cm^3}\)

Divide.

\(d=5.48961424 \ g/cm^3\)

Let's round to the nearest hundredth to make the answer more concise.

The 9 in the thousandth place tells us to round up. In the tenth place, the 8 will become a 9.

\(d\approx5.49 \ g/cm^3\)

The density of the rock is about 5.49 grams per cubic centimeter.

The property that is used to calculate the pH of a solution is (A) the hydrogen ion concentration in mol/L.

pH is a measure of the acidity or basicity of a solution. The pH scale ranges from 0 to 14, with 7 being neutral, values below 7 being acidic, and values above 7 being basic.

To calculate the pH of a solution, you need to know the concentration of hydrogen ions (H+) in mol/L (A).

pH is defined as the negative logarithm (base 10) of the hydrogen ion concentration, so the equation for calculating pH is:

pH = -log[H+]

For example, if the hydrogen ion concentration is 1 x 10^-4 mol/L,

the pH would be:

pH = -log(1 x 10^-4)

pH = 4

Note that pH is typically reported, so in this case, the pH would be reported as 4.0.
To know more about hydrogen ion visit:

https://brainly.com/question/8069088

#SPJ11

Therefore, the pH and the equilibrium concentration of S²⁻ in a 6.89x10⁻² M hydrosulfuric acid solution are pH = 7.78 and [S²⁻] = 2.31x10⁻¹¹ M.

Hydrosulfuric acid (H₂S) is a weak acid that dissociates in water to produce hydrogen ions (H⁺) and bisulfide ions (HS⁻). H₂S(aq) + H₂O(l) ⇌ H₃O⁺(aq) + HS⁻(aq)

The bisulfide ions (HS⁻) in turn reacts with water to produce hydronium ions (H₃O⁺) and sulfide ions (S²⁻).

HS⁻(aq) + H₂O(l) ⇌ H₃O⁺(aq) + S²⁻(aq) Ka1

= 1.0x10⁻⁷,

Ka2 = 1.0x10⁻¹⁹

To calculate the pH and the equilibrium concentration of S²⁻ in a 6.89x10⁻² M H₂S(aq) solution, we must first determine if H₂S(aq) is a strong or weak acid.

It has Ka1 = 1.0x10⁻⁷, which is a very small value; thus, we can conclude that H₂S(aq) is a weak acid.

To calculate the equilibrium concentration of S²⁻ in a 6.89x10⁻² M H₂S(aq) solution, we need to use the Ka2 value (Ka2 = 1.0x10⁻¹⁹) and a chemical equilibrium table.

[H₂S] = 6.89x10⁻² M[H₃O⁺] [HS⁻] [S²⁻]

Initial 0 0 0Change -x +x +x

Equilibrium (6.89x10⁻² - x) x xKa2 = [H₃O⁺][S²⁻]/[HS⁻]1.0x10⁻¹⁹

= x² / (6.89x10⁻² - x)

Simplifying: 1.0x10⁻¹⁹ = x² / (6.89x10⁻²)

Thus: x = √[(1.0x10⁻¹⁹)(6.89x10⁻²)]

x = 2.31x10⁻¹¹ M

Thus, [S²⁻] = 2.31x10⁻¹¹ M

To calculate the pH of the solution, we can use the Ka1 value and the following chemical equilibrium table.

[H₂S] = 6.89x10⁻² M[H₃O⁺] [HS⁻] [S²⁻]

Initial 0 0 0

Change -x +x +x

Equilibrium (6.89x10⁻² - x) x x

Ka1 = [H₃O⁺][HS⁻]/[H₂S]1.0x10⁻⁷

= x(6.89x10⁻² - x) / (6.89x10⁻²)

Simplifying: 1.0x10⁻⁷ = x(6.89x10⁻² - x) / (6.89x10⁻²)

Thus: x = 1.66x10⁻⁸ M[H₃O⁺]

= 1.66x10⁻⁸ M

Then, pH = -log[H₃O⁺]

= -log(1.66x10⁻⁸)

= 7.78 (rounded to two decimal places)

To know more about concentration visit:

https://brainly.com/question/30862855

#SPJ11

Answer:

Explanation:

density = mass / volume

mass = 17.95 grams

volume = 17.97 - 15.50 mL = 2.45 mL = 2.45 cc

density = 17.95 /(2.45) = 7.327 grams / cc

Answer:

C: checking your email

Explanation:

I believe that C would be impossible, as you cannot use wireless networks without radio waves

Answer:

This question lacks options, the options are:

A. Group C: 32.1 g, 35.0 g, 25.0 g

B. Group B: 25.5 g, 25.0 g, 24.8 g

C. Group A: 28.5g, 28.4 g, 28.5 g

D. Group D: 20.0 g, 25.0 g, 30.09

The answer is C. GROUP A

Explanation:

Precision in measurements refers to the degree of closeness between the repeated or measured values irrespective of how close they are to the true or accepted value, which is 25g in this case.

The precision of a measurement can be determined by simply finding the range (highest - lowest) of the measurements. The lowest range represents the most precise. The measurements for each group are:

Group C: 32.1 g, 35.0 g, 25.0 g

Range = 35.0 - 25.0 = 10g

Group B: 25.5 g, 25.0 g, 24.8 g

Range = 25.5 - 24.8 = 0.7g

Group A: 28.5g, 28.4 g, 28.5 g

Range: 28.5 - 28.4 = 0.1g

Group D: 20.0 g, 25.0 g, 30.09

Range = 30.09 - 25.0= 5.09g

Based on the ranges of the measurements in each group, one would notice that Group A has the lowest range (0.1g), hence, GROUP A is the most precise.

Answer: group A

Explanation: I got the answer right on my quiz.

Some NaNO₃ may not fully dissociate when dissolved in a solution due to factors such as limited solubility, presence of other ions, and temperature.

The dissociation of NaNO₃ in solution depends on its solubility and the conditions of the solution. NaNO₃ is generally highly soluble in water, meaning that it readily dissociates into Na+ and NO3- ions. However, there are instances where not all of the NaNO₃ will dissociate completely.

One factor that can limit the dissociation of NaNO₃ is its solubility. If the concentration of NaNO₃ in the solution exceeds its maximum solubility, a portion of the NaNO₃ may remain undissolved and not dissociate into ions dissolution.

Additionally, the presence of other ions in the solution can affect the dissociation of NaNO₃. Common ions in the solution, such as H+, OH-, or other cations and anions, can interact with the Na+ and NO₃- ions, forming compounds that are less soluble or stable. This can reduce the overall dissociation of NaNO₃.

Temperature can also play a role in the dissociation of NaNO₃. Higher temperatures generally increase the solubility and dissociation of salts, including NaNO₃. However, at lower temperatures, the solubility and dissociation may be reduced.

In conclusion, limited solubility, presence of other ions, and temperature are factors that can affect the complete dissociation of NaNO₃ in a solution, leading to some of the NaNO₃ remaining undissociated.

Learn more about dissolution here

https://brainly.com/question/32310082

#SPJ11

Answer:

D atoms of the same element which have different numbers of neutrons

Explanation:

Isotopy is the existence of two or more atoms of the same element having the same atomic number but difference mass number due to differences in the number of neutrons in their various nuclei.

Answer:

option 2

Explanation: