which of the following statements concerning energy transformations is true? question 9 options: potential energy increases with each transformation. decreases in entropy reduce usable energy. energy may be created during transformation. increases in entropy reduce usable energy. increases in temperature decrease total amount of energy available.

Percentage by mass of water in CuSO4.5H20 is 36.07% .

In this problem we have - copper(II) sulfate pentahydrate and it's molecular formula is (CuSO₄.5H₂O) .

There are 5 molecules of water are present.

Now we calculate it's molar mass-

We know that-

molar mass of Cu = 63.5u

Molar mass of SO₄ = 96 u

Molar mass of H₂O = 18 u

Now, molar mass of (CuSO₄.5H₂O) = 63.5 + 96 + 5 × 18

Now, molar mass of (CuSO₄.5H₂O) = 249.5u

And mass of water in CuSO₄.5H₂O = 90 u

now mass percentage of water = mass of water ÷ Total mass ×100

now mass percentage of water = 90 ÷ 249.5 × 100

now mass percentage of water =  36.07 %

So we find out mass percent by dividing given mass with total mass and then multiplying it with hundred and it came out to be 36.07 % .

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Answer:

36.1

Explanation:

If the balloon is closed, then yes, both volume and pressure will increase when the gas inside is heated.

What is pressure?

Pressure is the force applied perpendicular to the surface of an object per unit area over which that force is distributed.

Various units are used to express pressure. Some of these are units of force divided by units of area. For example, the SI unit of pressure, Pascal (Pa), is 1 Newton per square meter (N/m2). Similarly, pounds force per square inch (psi, symbol lbf/in2) is the traditional unit of pressure in imperial and US systems. Pressure can also be expressed as standard atmospheric pressure. Atmospheric pressure (atm) is equal to this pressure and torr is defined as 1/760 of this. Manometric units such as centimeters of water, millimeters of mercury, and inches of mercury are used to express pressure as the height of a particular liquid column within a manometer.

If the balloon is closed, then yes, both volume and pressure will increase when the gas inside is heated.

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Answer:

Number of Particles Outside Nucleus 48

Number of Particles Inside Nucleus 84

Answer:

180 g NaOH

Explanation:

Step #1 : Use the molarity equation to find moles. The volume is needed in liters, so convert the milliliters to liters.

Molarity (M) = moles (mol) / liters (L) ---->

Molarity (M) x liters (L) = moles (mol)

750 mL NaOH              1    L
                          x    ----------------   =    0.75 L NaOH
                                 1,000   mL

(6 M NaOH) x (0.75 L NaOH) = ? mol

                                                = 4.5 mol NaOH

Step #2 : Find the mass using the moles and the molar mass of the solution. The molar mass can be calculated using the values of the elements on the periodic table.

Molar Mass (g/mol) = grams (g) / moles (mol) --->

Molar Mass (g/mol) x moles (mol) = grams (g)

? g/mol = (22.99 g/mol Na) + (15.999 g/mol O) + (1.008 g/mol H)

? g/mol = 39.997 g/mol NaOH

(39.997 g/mol NaOH) x (4.5 mol NaOH) = ? g

                                                                  = 179.99 g NaOH

                                                                  = 180 g NaOH (2 sig figs)

                                                                  = 200 g NaOH (1 sig fig)

The sweet fiber in cat tail roots provides an abundance of starchy carbohydrates. The common cattail is not a perfect flower. Among the given options, cat tails  absorb nitrates from polluted water. The correct option is A.

The cattail flower spikes can be possible to boil and can be eaten just like the corn on the cob. Pollen from the matured flowers can be collected and can be used with other flour to make biscuits, muffins and pancakes.

Cattails have an amazing ability to absorb phosphorous, nitrogen and other elements which can destruct the water bodies and sediment beds. They play a vital function in treating wastewater.

Thus the correct option is A.

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These substances can burn the skin, eyes, and mucous membranes and can also cause respiratory issues, such as lung damage or asthma. Overall, strong acids and bases are hazardous chemicals that must be handled with extreme care to avoid injury and environmental damage.

Strong acids and bases belong to the class of chemical hazards. Strong acids and bases are corrosive materials, which means they can cause severe damage to living tissues, including skin and eyes. The potential severity of strong acids and bases makes them hazardous chemicals. An acid is a substance that donates a hydrogen ion (H+) to another substance, whereas a base accepts an H+ ion. When a strong acid is mixed with water, it will break down almost entirely, releasing H+ ions. Some examples of strong acids include sulfuric acid, hydrochloric acid, and nitric acid. These acids can cause severe burns and can even corrode metal. Bases are substances that produce OH- ions when they dissolve in water. Strong bases like sodium hydroxide and potassium hydroxide can be highly corrosive and can cause severe damage to tissues. These substances can burn the skin, eyes, and mucous membranes and can also cause respiratory issues, such as lung damage or asthma.Overall, strong acids and bases are hazardous chemicals that must be handled with extreme care to avoid injury and environmental damage.

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Answer: The temperature of the unknown gas is 191.4 K.

Explanation:

To calculate the temperature of the gas, we use ideal gas equation which is given as:

\(PV=nRT\)       .......(1)

Where

P = pressure of the gas = 5.5 atm

V = volume of gas = 12.0 L

n = number of moles = 4.2 moles

R = Gas constant = 0.0821 L.atm/mol.K

T = temperature of the gas = ?

Putting values in equation 1:

\(5.5atm\times 12.0L=4.2mol\times 0.0821L.atm/mol.K\times T\\\\T=\frac{5.5atm\times 12.0L}{4.2mol\times 0.0821L.atm/mol.K}\\\\T=191.4K\)

Hence, the temperature of the unknown gas is 191.4 K.

Answer:

Of what?

Explanation:

But uhh: An acid is a substance that donates protons or accepts a pair of valence electrons to form a bond. Bases can be thought of as the chemical opposite of acids.

Answer:

I think it is this:

S₂F₁₀

Hope this helps :)

The organic molecule acetone has the chemical formula (CH3)2CO. The smallest and most basic ketone. It is a colorless, incredibly combustible liquid with a distinctively strong smell. Because it is miscible with water, acetone is used as a significant organic solvent in industry, the household, and laboratories.

Calculate the mass of acetone, C3H6O, that vaporizes as a result of absorbing 500 KJ of energy.

Knowing that;

acetone weighs 31.5 g.

Acetone's molar mass is 58.08 g/mol.

Acetone has a heat of vaporization of 31.3 kJ/mol.

Count of moles = mass / molar mass

Acetone molecular weight = 31.5 / 580.8

Acetone has a molecular weight of 0.5424 moles.

By dividing the number of moles of acetone by the heat of vaporization of acetone, one may calculate the amount of heat necessary to evaporate 31.5 g of acetone;

Hence;

31.3 g of acetone must be heated to vaporization temperature of 31.0 kJ/mol, or 0.5424 mole.

16.8144 kJ of heat are needed to evaporate 31.3 g of acetone.

≅ 16.81 kJ

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8: Discussion section does not contain any mistakes; 9: Yes, the results of other studies can be used in the discussion section. There is a mistake in the last sentence of discussion section. Sentence implies that previous studies have found that methanol is most effective in extracting flavonoids and polyphenols from all plants, which is not true.

According to the last sentence of the discussion section, the results from this study were similar to those from a previous study that found methanol to be the most effective solvent in extracting flavonoids and polyphenols from plants.

However, the sentence lacks clarification that the previous study only concluded that methanol was most effective for extracting flavonoids and polyphenols from the specific plant they tested, and not from all plants.

Therefore, it is important to be specific and clear when referencing the results of other studies in the discussion section.

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The conjugate base of an acid does not always carry a negative charge. To understand this, let us first define the terms 'acid' and 'conjugate base'.An acid is a substance that releases H+ ions when dissolved in water.

An example of an acid is hydrochloric acid (HCl) which releases H+ ions and chloride ions (Cl-) when dissolved in water. HCl + H2O → H3O+ + Cl-.A conjugate base is the substance that is formed when an acid loses a proton (H+ ion). It can be formed from any acid, whether it is weak or strong. The conjugate base of an acid is the species that remains after an acid has donated a proton to another species. In the case of HCl, Cl- is the conjugate base, and it carries a negative charge because it has gained an electron and has a greater number of electrons than protons.Conversely, the conjugate base of a weak acid may not carry a negative charge. For example, the conjugate base of acetic acid (CH3COOH) is acetate ion (CH3COO-) which does not carry a negative charge. Acetate ion has a greater number of electrons than protons, but its net charge is zero. Thus, the conjugate base of an acid does not always carry a negative charge.

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Among the given options, asphalt has the least number of carbon atoms/molecules.

Asphalt is a dense and solid material composed mainly of large hydrocarbon molecules, primarily made up of carbon and hydrogen atoms. It contains a high proportion of carbon atoms but does not have as many individual molecules compared to the other options.

On the other hand, natural gas, gasoline, and jet fuel are all fuels derived from petroleum and consist of various hydrocarbon compounds. These fuels typically have a higher number of carbon atoms/molecules compared to asphalt.

Therefore, the correct answer is d. asphalt.

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The average atomic mass of copper is 63.6284 amu.

The element copper (Cu) has two naturally occurring isotopes with mass numbers of 63 and 65. Their relative abundance and atomic masses are as follows:Mass numberRelative abundance (%)Atomic mass (amu)63 69.2 62.93 65 30.8 64.93How to calculate the average atomic mass of copper?The average atomic mass of copper can be calculated using the following formula:average atomic mass = (fractional abundance of isotope 1 x atomic mass of isotope 1) + (fractional abundance of isotope 2 x atomic mass of isotope 2)Here, isotope 1 refers to copper-63, and isotope 2 refers to copper-65. The fractional abundances of these isotopes are given, and their atomic masses are taken from the periodic table. Thus, the calculation is as follows:average atomic mass = (0.692 x 62.93 amu) + (0.308 x 64.93 amu)average atomic mass = 43.608 + 20.0204 average atomic mass = 63.6284 amu. Therefore, the average atomic mass of copper is 63.6284 amu.

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Answer:

ionic bonding or covalent

Explanation:

Answer: a. 1.11 atm, 0.43 mol

Explanation:

Answer: 112.2 g

Explanation:

The atomic mass of silicon is 32.065 g/mol, so 3.5 moles have a mass of (3.5)(32.065) grams, or about 112.2 g

Answer:

3.39e+20

Explanation:

So,

First of all, there are too many types of intermolecular forces:

1. Dispersion forces: London dispersion force is a weak intermolecular force between two atoms or molecules in close proximity to each other. The force is a quantum force generated by electron repulsion between the electron clouds of two atoms or molecules as they approach each other. Every molecules have this kind of force.

2. Dipole: Dipole-dipole forces are attractive forces between the positive end of one polar molecule and the negative end of another polar molecule. They are much weaker than ionic or covalent bonds and have a significant effect only when the molecules involved are close together (touching or almost touching).

3. Hydrogen-bonding: Hydrogen bonding is a special type of dipole-dipole attraction between molecules, not a covalent bond to a hydrogen atom. It results from the attractive force between a hydrogen atom covalently bonded to a very electronegative atom such as a N, O, or F atom and another very electronegative atom.

Let's begin with hypobromous acid (HBrO).

HBrO is a compound that can form Hydrogen bonds since there's a hydrogen atom bonded to an Oxygen atom.

This compound also presents dispersion forces since atoms are close to each other.

And, there's also dipole-dipole forces because as you can see, there's a positive end (H+) and a negative end (BrO-).

Now, let's analyze SiH4:

SiH4 is composed of molecules, for which the only intermolecular forces are London dispersion forces.

There's no Hydrogen Bonding because Hydrogen can't bond to a very electronegative element such as O, N or F.

As you see, Si is not a very electronegative element.

And, there's not dipole-dipole forces because there's not a positive or a negative end. In this compound, H and Si share all their electrons but there's not any charges when they are close together.

Let's check now Oxygen difluoride (OF2):

As you can notice, London dispersion forces are present in all compounds, so, this is the first force identified.

Now, there's not Hydrogen, so, this molecule can't form Hydrogen-Bonds with itself.

If we look at the dipole-dipole forces, we can clearly notice that OF2 is a bent polar molecule. That means that it actually has this kind of force.

And, finally, carbon monoxide (CO):

Because CO is a polar molecule, it experiences dipole-dipole attractions.

We also know that there's London dispersion forces.

There's no Hydrogen Bonding in this molecule.

The new pressure of the gas is 2.176atm. Boyle's Law will be applied to this issue. According to this rule, the pressure and volume fluctuate inversely when a gas is kept in a closed container and maintained at a constant temperature.

Given,

a sample of gas occupies 4 liters (V1)

the volume is changed to 2 liters (V2)

Temperature(T1) =25C

STP means p = 1 atm and T = 273.15 K

T2 = 25 + 273.15 = 298.15 K

The following is its mathematical expression:

p1V1 / T1 = p2V2 / T2

1 x 4 / 273.15 = p x 2 / 298.15

= 0.0146 = p*2/298.15

= 0.0146 *298.15 = 2p

  2p = 4.352

therefore,

p = 4.352/2

p = 2.176

p = 2.176 atm

the new pressure of the gas is 2.176atm.

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Answer:

technetium, atomic number 43; promethium, number 61; astatine, number 85; francium, number 87; neptunium, number 93; and plutonium, number 94.

Explanation:

The component of a chemical reaction that does not change from beginning to end is the mass. According to the law of conservation of mass, matter can neither be created nor destroyed in a chemical reaction.

The total mass of the reactants before the reaction must be equal to the total mass of the products after the reaction. This means that the mass is conserved throughout the reaction. Therefore, the mass is the component of a chemical reaction that does not change from beginning to end.

However, while the mass of the substances remains the same, their chemical composition does change due to the rearrangement of atoms and formation of new chemical bonds.

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Answer:

b.location in the sky (If the question is saying:The H-R diagram is useful in

studying all of these about a star except for)

Explanation:

The theoretical HR diagram plots the temperature of the star vs their luminosity (brightness) and the observational HR diagram plots color of the stars vs the absolute magnitude. Depending on mass, stars will also go through specific evolutionary stages that can be seen through the location of the star on the HR diagram. However, the HR diagram will not have data on the location of the star in the sky.

In this reaction, the element that has been oxidized is Fe (iron) because it has lost electrons to form Fe²⁺ ions. The element that has been reduced is Na (sodium) because it has gained electrons to form Na+ ions.

Oxidation is the process of losing electrons, while reduction is the process of gaining electrons. In this case, sodium (Na) is oxidized because it loses electrons, going from its elemental state (Na) to forming Na+ ions (NaCl). Sodium loses one electron to become a Na+ ion. On the other hand, iron (Fe) is reduced because it gains electrons, going from a compound FeCl₂ (where iron is in the +2 oxidation state) to its elemental state (Fe). Iron gains two electrons to become neutral iron atoms.

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Answer:

c good luck with the answer

Answer:

Platelets

Explanation:

Those are there to heal any wounds to keep the blood from leaking through. So if you ever stop bleeding, thats why

The state change occurs when the glass melts.

The matter is anything that has mass and occupies space.

The different states of matter are solid, liquid, gas, and plasma.

The properties of the different types of matter can be understood by looking at the arrangement of molecules.

When a solid substance is heated beyond its melting point, it changes its state from solid to liquid.

When liquid is heated beyond its vaporizing point, it changes its state from liquid to gas.

Solids are closely packed and have a definite shape and size.

Liquids are loosely packed and take up the space of the container.

Gas has high intermolecular spacing and the gases are not rigid.

Ground glass is melted under light heat and poured into molds.

Recycling glass involves changing the state of glass from solid to liquid state.

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Answer:

1.168 x 10^28

Explanation:

CH4= carbon + hydrogen: 12+(4 x1)= 16g

16 7.3 x 10^25

----- x ------------------- = 1.168 x 10^28

1 1