30g of solute is dissolved in 100g of water. Calculate its % (m/m) concentration.

The final volume of the system is 325 L.

The change in internal energy of a system is equal to the heat added or removed from the system plus the work done on or by the system. In this case, the change in internal energy is -325 J, and the system loses 155 J of energy as heat.

To find the work done by the system, we need to use the equation: work = -pressure * change in volume.

Given that the initial volume is 15.0 L and the initial pressure is 1.00 atm, we can calculate the work done as follows:

work = -1.00 atm * change in volume

Now, let's solve for the change in volume:

work = -1.00 atm * change in volume
-325 J = -1.00 atm * change in volume

To find the final volume, we rearrange the equation:

change in volume = -325 J / -1.00 atm

The units of atm and J will cancel out, leaving us with the final volume in liters:

change in volume = 325 L atm / 1 atm
change in volume = 325 L

Therefore, the final volume of the system is 325 L.

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Answer:

Cesium

hope this helps :)

Marble is not used as a material in decorative fixtures because it is easily corroded by acidic substances. The most common fixture style of drinking fountain and water cooler is wall-mounted.

1. Marble is a naturally occurring stone that is formed from limestone under high pressure and temperature. It is known for its beautiful veining, durability, and strength. Marble is commonly used in construction, such as for flooring, countertops, and statues.

However, marble is not used as a material in decorative fixtures because it is easily corroded by acidic substances, such as vinegar or lemon juice. This can cause the marble to etch, dull, or discolor, which can ruin the beauty of the decorative fixture. Therefore, other materials, such as ceramic, porcelain, or glass, are used instead.

2. Drinking fountains and water coolers are commonly found in public places, such as schools, parks, and offices. They provide a convenient and hygienic way for people to drink water. There are several styles of drinking fountains and water coolers, but the most common style is wall-mounted.

This style is attached to the wall and is usually connected to a water supply and drain. Wall-mounted drinking fountains and water coolers are easy to install, maintain, and clean, making them a popular choice for public areas.

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Answer:

Selenium

Explanation:

selenium has 4 energy levels (think a 4 story building) while oxygen only has 2 (think 2 story building). which one is taller?

3.3 g of hydrogen gas will be produced.

Stoichiometry helps to measure quantitative relationships between the amounts of products 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 we have to write the balanced equation

Mg + 2HNO₃  → Mg(NO₃)₂ + H₂

According to Stoichiometry

\(40.9\ \text{g Mg} \times \frac{1\ \text{mol Mg}}{24.31\ \text{g Mg}} \times \frac{1\ \text{mol}\ H_2}{1\ \text{mol Mg}} \times \frac{2.02\ g\ H_2}{1\ \text{mol}\ H_2}\)

= 3.3 g H₂

Thus from the above conclusion we can say that 3.3 g of hydrogen gas will be produced.

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Answer:

4.50000 moles

Explanation:

This is dimensional analysis. If there is 163.59 grams in 1 mole of this compound then the converse is true: in 1 mole of this compound there is 163.59 grams --> 1 mol/163.59 grams.

Now that you have your conversion factor:

736.155 grams * (1 mol/163.59 grams) is your equation.

When you multiply these together, grams cancel and you end up with the desired mole-based answer:

4.50000 moles (The extra zeros are to make up for the 6 significant figures in 736.155, feel free to omit them if necessary.)

(pls give brainliest if this helped)

The molarity of an NaOH solution is 106.81 M if 1.653 mmol of oxalic acid requires 15.45 mL of NaOH.

The molarity of an NaOH solution if 1.653 mmol of oxalic acid requires 15.45 ml of NaOH can be calculated as follows:

Moles of oxalic acid = 1.653 mmol

Volume of NaOH = 15.45 mL

Concentration of NaOH = ?

We need to use the molarity formula,

Molarity = moles of solute / volume of solution in liters

First, we need to convert the volume of NaOH to liters.

1 mL = 1/1000 L15.45 mL = 15.45/1000 L = 0.01545 L

Now, substituting the values in the formula:

Molarity = 1.653 mmol / 0.01545 L = 106.81 mol/L or 106.81 M

The molarity of an NaOH solution is 106.81 M if 1.653 mmol of oxalic acid requires 15.45 mL of NaOH.

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Answer: k = 5

Explanation:

k = the number of units that f(x) was moved up to get g(x).

We can see from the graph that f(x) was moved five units up.

So k = 5.

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Answer:

Reduce high-pressure gas in the scuba cylinder to ambient (surrounding) pressure.

Explanation:

The primary function of a scuba regulator would be to reduce high-pressure gas in the scuba cylinder to ambient pressure.

A scuba regulator is a structure found attached to the scuba cylinder usually carried by scuba divers. The structure regulates the pressure of the breathing gas in the cylinder to a safe level before the gas becomes available for the breathing process of divers.

Usually, the gas in a scuba cylinder is at a high level. Hence, what the regulator does is to bring it down to a level that would be safe for the breathing of the diver.

Answer:

A) They have the same charge.

B) They are located in the nucleus together.

C) Particle A has a positive charge, and Particle B is neutral.

D) Particle A orbits the nucleus, and Particle B is located in the nucleus.

Explanation:

The pH of resulting buffer from the Henderson- Hasselbalch is 10.01.

To calculate the pH of the buffer, we need to use the Henderson-Hasselbalch equation:
pH = pKa + log([A-]/[HA])
First, we need to find the concentration of NH3 and NH4Cl in the solution.
Molar mass of NH3 (ammonia) = 17.03 g/mol
Molar mass of NH4Cl (ammonium chloride) = 53.49 g/mol
Concentration of NH3 = (7.81 g / 17.03 g/mol) / (0.250 L)
Concentration of NH4Cl = (6.54 g / 53.49 g/mol) / (0.250 L)
Next, we need to find the pKa of NH3/NH4Cl.

The pKa of NH4Cl is approximately 9.24.
Finally, substitute the values into the Henderson-Hasselbalch equation:
pH = 9.24 + log([NH3] / [NH4Cl])
Calculate the ratio [NH3] / [NH4Cl] and substitute it into the equation to find the pH.

So, the pH of resulting buffer from the Henderson- Hasselbalch is 10.01.

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The rate law for the given reaction is k[A][B]^3.

Given reaction is 2A + 3B → Products which is first order in A and third order overall.

To find the rate law we need to use the equation for the third-order reaction which is given as :

k[A]^m[B]^n

where, k is the rate constant

m is the order of the reaction with respect to A (i.e., first order in A)

n is the order of the reaction with respect to B (i.e., third order in B)

By substituting the given values , k[A]^1[B]^3

The order of the reaction with respect to A is 1, so we include [A] to the power of 1, which we can write as [A]^1 or simply as [A]. The order of the reaction with respect to B is 3, so we include [B] to the power of 3, which we can write as [B]^3.

The overall rate law is : k[A][B]^3

Thus, the rate law for the given reaction is k[A][B]^3.

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Answer:

9.99L

Explanation:

you can see the answer at the pic

Answer:

The volume of aluminum is 9.99 cm³.

Explanation:

Given data:

Mass of aluminum = 26.98 g

Density of aluminum = 2.70 g/cm³

Volume of aluminum = ?

Solution:

Formula:

d = m/v

now we will put the values in formula.

2.70 g/cm³ = 26.98 g / v

v = 26.98 g / 2.70 g/cm³

v = 9.99 cm³

Thus, the volume of aluminum is 9.99 cm³.

Answer:

All of us are exposed to radiation every day, from natural sources such as minerals in the ground, and man-made sources such as medical x-rays. According to the National Council on Radiation Protection and Measurements (NCRP), the average annual radiation dose per person in the U.S. is 6.2 millisieverts (620 millirem).

Explanation:

Energy is inversely proportional to the wavelength of a wave. Which would have the GREATEST energy. A wave with a wavelength of  5  meters.

The relationship between wavelength and energy is given as :

E = hf

E = h c / λ

where,

E = energy

h = Planck constant

c = speed of light

λ = wavelength

So, energy is inversely proportional to wavelength,  therefore, the wave having least amount of wavelength will have greatest amount of energy. So, according to the given value . the wavelength 5 m will have greatest energy.

Thus, Energy is inversely proportional to the wavelength of a wave. Which would have the GREATEST energy. A wave with a wavelength of  5  meters.

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Element Z can be classified as a metal and will be found to the left of the zigzag line of the periodic table.

Hence, option 3 is correct answer.

Metals are solid at room temperature. Metals are malleable. Metals loses electrons easily. Metal are less electronegative. Non metals are non malleable. Non metals cannot loses electron. Non metals are more electronegative.

The Zig-Zag line called the amphoteric line, the semimetal line, the metal non metal line, the stair case and the metalloid line on the periodic table separates the metals from the non metals.

Thus from the above conclusion we can say that Element Z can be classified as a metal and will be found to the left of the zigzag line of the periodic table.

Hence, option 3 is correct answer.

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Disclaimer: The question was given incomplete on the portal. Here is the complete question.

Question: Element Z has the following properties:

a. silvery-white solid at room temperature

b. malleable

c. used as a catalyst

d. conducts electricity

Element Z can be classified as a _________ and will be found ________ the zigzag line of the periodic table.

(1) non-metal; along side of

(2) metal; along side of

(3) metal; to the left of

(4) metalloid, along side of

(5) non-metal; to the right of

Option 3 is correct

Element Z can be classified as a metal and will be found to the left of the zigzag line of the periodic table.

As the element Z conducts electricity, so it is a metal.

Metals can be hammered, crushed, or rolled into thin sheets without breaking due to a feature known as malleability.

As the given element Z is malleable, so it is a metal.

Most transition metals are also used as catalyst because they can activate other compounds by adsorbing them to their surface. As the element Z is used as catalyst, so it is metal.

Some other physical properties of metals are :

1) They are also good conductor of heat.

2) Highly ductile

3) They are lustrous

4) They are sonorous

Metals are present on the left side of the zig-zag line (the line that separates metals and non metals) whereas non-metals are present on the right side of this line.

As the Element Z is metal on the basis of the given properties left side of the zig-zag line, so it will be found to the left of the zigzag line of the periodic table.

Hence option (3) is correct

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Momentum-

\( \:\:\:\:\:\:\:\:\:\:\:\:\star\sf \underline {P = mv}\\\)

Where-

As per question, we are given -

Convert 20 minutes to hour-

Therefore, 20 minutes = 20/60 = 1/3 hour

\( \:\:\:\:\:\:\longrightarrow \sf\underline{Speed _{(car)} = \dfrac{Distance }{ time}}\\\)

\( \:\:\:\:\:\:\longrightarrow \sf Speed_{(car)} = \dfrac{12}{\dfrac{1}{3}}\\\)

\( \:\:\:\:\:\:\longrightarrow \sf Speed_{(car)}=12 \times 3 \\\)

\( \:\:\:\:\:\:\longrightarrow \sf Speed_{(car)}= 36 km/h \\\)

\( \:\:\:\:\:\:\longrightarrow \sf Speed_{(car)}= \dfrac{36 \times 1000}{3600}\\\)

\( \:\:\:\:\:\:\longrightarrow \sf Speed_{(car)}= \dfrac{\cancel{36} \times 10\cancel{0}\cancel{0}}{\cancel{36}\:\cancel{0}\cancel{0}}\\\)

\( \:\:\:\:\:\:\longrightarrow \sf \underline{Speed_{(car)} = 10 m/s }\\\)

No that we have obtained the velocity of the car is 10 m/s and the mass of the car is 30 kg,so we can put all the values and find for momentum of car -

\( \:\:\:\:\:\:\longrightarrow \sf \underline{Momentum_{(car)} = mv}\\\)

\( \:\:\:\:\:\:\longrightarrow \sf Momentum_{(car)} = 30 \times 10\\\)

\( \:\:\:\:\:\:\longrightarrow \sf\underline{ Momentum_{(car)} =300 kgms^{-1}}\\\)

Answer:

Two of the three salts are soluble.

One of the three salts is soluble.

Explanation:

One or two of the three salts would be soluble in water depending on if the water is cold or hot.

According to the solubility rules of chloride salts, all chlorides are soluble in cold water except for those of silver (Ag), lead (Pb), and mercury (I) (Hg).

This thus means that both AgCl and \(PbCl_2\) would be insoluble in cold water while LiCl would be soluble.

\(PbCl_2\) is, however soluble in hot water.

Hence, in cold water, one of the three salts (LiCl) would be soluble, while in hot water, two of the three salts (LiCl and \(PbCl_2\)) would be soluble.

The time taken for the isotope of the sample element having a half life of 27.7 days to decay from its 600 g sample to 75 g is 36.09 days.

Radioactive decay is a nuclear reaction by which an unstable nuclei will undergo emission of charged particles such as alpha, beta, gamma.

By this process unstable nuclei will form their stable isotope or other new atoms. The decay constant k for the nuclear reaction is calculated from the half life time as below:

decay constant = 0.693 /27.7 days

                          = 0.025 days-1

Now the time taken for the decay of 600 g of the sample to 75 g is calculate as follows:

t = 1/(0.025) log (600/75)

  = 36.09 days

Hence,  time taken for the isotope of the sample element having a half life of 27.7 days to decay from its 600 g sample to 75 g is 36.09 days.

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Answer:

Industrial activity increases the emission of greenhouse gases in the atmosphere, especially carbon dioxide (CO2), and it negatively affects climate by increasing global warming.

Two actions to face the global warming:

1- To substitute the use of fossil fuels by alternative clean energy sources such as, for example, hydroelectric, geothermal, solar and wind energy resources.  

2- The government's policies decided to develop electric cars and to stimulate healthy habits such as walking instead of the use of conventional fossil-fueled transport modes.

The remaining moles of C is 5.01 moles while the remaining moles of F₂ is 0.

The reaction between carbon and Fluorine is given as;

C + 2F₂  -------> CF₄

1  :    2                1

from the reaction above,

2 moles of F₂ requires 1 mole of C

7.88 mole of  F₂ will require:    7.88/2 = 3.94 moles of C and 3.94 moles of CF₄.

The remaining moles of C = 8.95 - 3.94 = 5.01 moles while the remaining moles of F₂ is 0.

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A student has a solution of sodium nitrate and believes it is saturated. The  statement provides the best evidence that the solution is saturated is: "When additional sodium nitrate is added, it all settles to the bottom of the container." (Option D)

The chemical compound with the formula NaNO 3 is sodium nitrate. To differentiate it from regular saltpeter, potassium nitrate, this alkali metal nitrate salt is sometimes known as Chile saltpeter. Nitratine, nitrate, and soda niter are all names for the mineral form.

If more solute is added and it still does not dissolve, the original solution has become saturated. If the solute supplied dissolves, the previous solution was unsaturated.

A saturated solution is a chemical solution with the maximum level of bound solvent. The excess solution will not dissolve in a saturated solution. The amount of fluid that can be added to a solvent to form a saturated solution depends on a variety of variables.

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Molecular geometry helps in determining the polarity, reactivity, phase of matter, color, magnetism, as well as the biological activity.

Molecular geometry is used to determine the shapes of molecules.

The shape of a molecule helps to determine its properties.

For example, carbon dioxide is a linear molecule. This means that  CO2

​molecules are generally non-polar and will not be very soluble in water which is a polar solvent.

Other molecules have different shapes. Water molecules have a bent structure. This is one of the reason why water molecules are polar and have some  properties such as cohesion, surface tension and also hydrogen bonding.

Understanding molecular geometry also helps scientist to understand the shapes of more complex molecules such as proteins and also the DNA. The shapes of these molecules play incredibly important roles in determining the jobs performed by these molecules in our bodies.

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Answer:

A. Distance = 18 m

    time = 2 hr

    speed = 9 m/hr

Explanation:

Speed is the same thing as velocity.

Velocity = distance/time

18m/2hr = 9m/hr

For choice B, the numbers are right, but the units are mixed (minutes were changed to hours)