what is energy
A) The ability to do work
B) A form of sound
C)The size of an object
D) The number of atoms in an object

The two gases that make up more than 95% of inhaled breath are Nitrogen (N2) , Oxygen (O2) .

The two gases that make up more than 95% of inhaled breath are:

Nitrogen (N2): Nitrogen is the most abundant gas in inhaled breath, making up approximately 78% of the total volume. It is an inert gas and does not participate in metabolic processes in the body.

Oxygen (O2): Oxygen is the second most abundant gas in inhaled breath, comprising about 21% of the total volume. It is essential for aerobic respiration and plays a crucial role in supporting various physiological processes in the body.

Together, nitrogen and oxygen account for approximately 99% of the total volume of inhaled breath. Other gases such as carbon dioxide (CO2), argon (Ar), and trace amounts of other gases are also present but in much smaller concentrations.

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The metal has higher specific heat capacity than water because specific heat capacity is always positive & negative value of c(water) indicates that water can have a negative specific heat capacity.

The amount of heat required to increase the temperature of 1 gram of a substance by 1 degree Celsius (°C) is known as specific heat.

According to formula

q = m x c x ΔT

where q amount of heat absorbed or released, m mass of the substance, c specific heat capacity of the substance, and ΔT change in temperature.

We can start by finding the amount of heat released by the metal:

q(metal) = m x c(metal) x ΔT(metal)

q(metal)= 10 g x c(metal)x (100°C - 35°C)

q(metal)= 650 g°C x c(metal)

We can also find the amount of heat absorbed by the water:

q(water) = m x c(water) x ΔT(water)

q(water)= 10 g x c(water) x (35°C - 20°C)

q(water)= 150 g°C x c(water)

Since the metal releases heat and the water absorbs heat, we know that q(metal) = -q(water) (i.e., the heat lost by the metal is gained by the water).

Therefore:

650 g°C x c(metal) = -150 g°C x c(water)

Solving for c(water), we get:

c(water) = -650/150 x c(metal)

c(water) = -4.33 x c(metal)

Since specific heat capacity is always positive, we know that c(water) is negative in this case. This indicates that water cannot have a negative specific heat capacity. Therefore, the metal has a higher specific heat capacity than water.

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Considering the definition of molar mass, the number of moles of Zn reactant used is 2 moles.

The molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.

The balanced reaction is:

Zn(s) + 2 HCl(aq) → ZnCl₂ + H₂(g)

Assume that 130.8 grams of Zn was used in this reaction.

To determine the number of moles of hydrogen gas formed, you need to know the number of moles of Zn reactant was used.

So to determine the number of moles used you know that the molar mass of Zn is 65.37\(\frac{g}{moles}\). Then:

\(molar mass=\frac{mass}{number of moles}\)

\(65.37\frac{g}{moles} =\frac{130.8 g}{number of moles}\)

Solving:

number of moles× 65.37\(\frac{g}{moles}\)= 130.8 g

\(number of moles=\frac{130.8 g}{65.37\frac{g}{moles}}\)

number of moles≅ 2 moles

Finally, the number of moles of Zn reactant used is 2 moles.

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Answer:

Hydrogen Bond is the force that exists when H is directly connected to F, O, or N. HCl and HI cannot form hydrogen bonds between them. CH3OH and NH3 can form hydrogen bonds between them. CH4 and H2O cannot form hydrogen bonds between them.

Explanation:

The mass of the other isotope of antimony is approximately 52.387328 amu divided by the abundance of the other isotope.

To calculate the mass of the other isotope of antimony, we can use the weighted average formula, considering the abundance and isotopic masses of both isotopes.

Let's denote the mass of the other isotope as x amu.

Given:

Atomic weight of antimony = 121.757 amu

Abundance of one isotope = 57.30%

Isotopic mass of one isotope = 120.904 amu

Using the weighted average formula:

Atomic weight = (Abundance₁ × Isotopic mass₁) + (Abundance₂ × Isotopic mass₂)

121.757 amu = (57.30% × 120.904 amu) + (Abundance₂ × x amu)

Now, we can solve for the mass of the other isotope, x.

x amu = (121.757 amu - (57.30% × 120.904 amu)) / Abundance₂

x amu = (121.757 amu - (0.5730 × 120.904 amu)) / Abundance₂

x amu = (121.757 amu - 69.369672 amu) / Abundance₂

x amu = 52.387328 amu / Abundance₂

Therefore, the mass of the other isotope of antimony is approximately 52.387328 amu divided by the abundance of the other isotope.

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If 13 % of the carbon-14 in a sample of cotton cloth remains, what's the approximate age of the cloth?

To solve a half-life problem we usually use this formula:

amount remaining = initial amount (1/2)^n

Where n is the number of half-lives. We can replace n for T/Thalf:

amount remaining = initial amount (1/2)^(T/Thalf)

Where t is the age or time elapsed and Thalf is the half-life or our isotope. The half life of C-14 is 5730 years. Then:

Thalf = 5730 years

Let's supose that the cotton cloth originally had 100 g of C-14. If 13 % remains, the amount remaining is 13 g. So:

amount remaining = 13 g initial amount 100 g

Rearranging the formula we get:

amount remaining = initial amount (1/2)^(T/Thalf)

amount remaining/initial amount = (1/2)^(T/Thalf)

ln (amount remaining/initial amount) = ln [(1/2)^(T/Thalf)]

ln (amount remaining/initial amount) = (T/Thalf) *ln (1/2)

T = Thalf * ln (amount remaining/initial amount) /ln (1/2)

Now we can replace the given values:

T = 5730 years * ln(13 g/100g) / ln(1/2)

T = 5730 years * ln(0.13)/ln(0.5)

T = 5730 years * 2.94

T = 16825 years

Answer: the approximate age of the cloth is 16825 years.

Answer:

this is your answer i hope it will help you if this answer is right then folow meChromatography can be quantitatively found by the retention factor. Therefore, the important criterion to use chromatography for separating components of a mixture is the difference in solubility of the liquids.

Answer:

157.64 L

Explanation:

We'll begin by converting 30 °C to Kelvin temperature. This can be obtained as follow:

T(K) = T(°C) + 273

T(°C) = 30 °C

T(K) = 30 °C + 273

T (K) = 303 K

Next, we shall convert 600 mmHg to atm. This can be obtained as follow:

760 mmHg = 1 atm

Therefore,

600 mmHg = 600 mmHg × 1 atm / 760 mmHg

600 mmHg = 0.789 atm

Finally, we shall determine the volume of the gas. This can be obtained as follow:

Number of mole (n) = 5 moles

Temperature (T) = 303 K

Pressure (P) = 0.789 atm

Gas constant (R) = 0.0821 atm.L/Kmol

Volume (V) =?

PV = nRT

0.789 × V = 5 × 0.0821 × 303

0.789 × V = 124.3815

Divide both side by 0.789

V = 124.3815 / 0.789

V = 157.64 L

Therefore, the volume of the gas is 157.64 L

A significant heat-trapping gas, or greenhouse gas, called carbon dioxide (CO2) is produced through the production and burning of fossil fuels like coal, oil, and natural gas as well as during wildfires and other natural processes like volcanic eruptions.

Thus, The first graph displays atmospheric CO2 measurements made recently at Hawaii's Mauna Loa Observatory without accounting for seasonal or natural variations.

The air bubbles trapped in ice sheets and glaciers over Earth's last three glacial cycles are used in the second graph to depict CO2 levels during those periods.

Human activities have increased atmospheric CO2 by 50% since the start of the industrial era (in the 18th century), bringing it to 150% of its value in 1750.

Thus, A significant heat-trapping gas, or greenhouse gas, called carbon dioxide (CO2) is produced through the production and burning of fossil fuels like coal, oil, and natural gas as well as during wildfires and other natural processes like volcanic eruptions.

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Answer:

The feedback loop involving water vapor and temperature is a positive feedback loop. As temperature increases, the amount of water vapor that can be held in the atmosphere also increases. This leads to an increase in the amount of water vapor in the atmosphere, which further amplifies the greenhouse effect and contributes to additional warming.

In other words, warmer temperatures lead to more water vapor in the atmosphere, which traps more heat, causing further warming, and so on. This positive feedback loop can amplify the initial warming effect caused by other factors such as greenhouse gas emissions or changes in solar radiation.

Conversely, if the temperature decreases, the amount of water vapor that can be held in the atmosphere decreases, which can lead to a decrease in the amount of water vapor present in the atmosphere, reducing the greenhouse effect and contributing to cooling. However, this negative feedback loop is weaker than the positive feedback loop described above, and it tends to be dominated by the positive feedback loop under most circumstances.

The journal entry Marigold Corp. would make upon receipt of the check are 1, Dr. Sales Returns and Allowances $600 and Cr. Accounts Receivable $600 and 2. Dr. Accounts Receivable $816, Cr. Cash $800, and Cr. Sales Discounts $16.

Marigold Corp. will record the following journal entries upon receipt of the check from Morton Company:

1. Sales Returns and Allowances: To record the returned damaged merchandise, Marigold Corp. will debit Sales Returns and Allowances for $600 and credit Accounts Receivable for $600.

2. Cash and Sales Discounts: Since Morton Company settles the account within the discount period (2/9, n/30), they are eligible for a 2% discount on the remaining balance after the return. The remaining balance is $1400 - $600 = $800. The 2% discount amounts to $800 * 0.02 = $16. Therefore, Marigold Corp. will debit Accounts Receivable for $816 ($800 + $16), credit Cash for $800, and credit Sales Discounts for $16.

These entries reflect the return of damaged merchandise, the receipt of payment within the discount period, and the application of the sales discount.

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Due to the lack of supply of energy the methane could not change its phase before 2007.

Even though it has been summer since 2002, the lake didn't dry up until 2007. After 2007, the sun had given out enough energy for the methane molecules' kinetic energy to rise enough to outweigh their attraction to one another. The methane molecules in the lake were gaining kinetic energy at this moment, but the lake was still liquid. The temperature of the molecules remains constant while they melt because the average kinetic energy of the molecules does not vary.

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Answer:

I'm sorry, but it's not correct to say that nitric acid (HNO3) reacts with aqueous potassium rubidium sulfide to form hydrogen sulfide gas.

Potassium rubidium sulfide is not a known compound. Potassium sulfide and rubidium sulfide are two different compounds, and they have different chemical formulas and properties. Also, neither of them reacts with nitric acid to form hydrogen sulfide gas.

If you have any other chemistry questions, I'd be happy to help!

Explanation:

The change that wilL occur is that the the reaction shifts to the right (products) to produce fewer moles of gas.

option C is correct.

The balanced equation is:

\(51.8 kJ + H_2(g) + 12(g) = 2HI(g)\)

From the left, there are 1 mole of H2 gas and 1 mole of I2 gas, which gives a total of 2 moles of gas.

In the right,  there are 2 moles of HI gas.

We can tell that there are more moles of gas on the left side than on the right side by comparing the amount of moles on each side.

According to Le Chatelier's principle, a decrease in volume will favor the side with fewer moles of gas.

In our scenario, the reaction will shift to the right  to produce fewer moles of gas.

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Answer:

there is no change

Explanation:

acellus correct

The molecular basis for the correlation between disulfide bond content and mechanical properties of the protein comparison of a-keratin and glutenin is the presence and amount of disulfide bonds in these proteins.

The presence and amount of disulfide bonds in these proteins directly correlate with their mechanical properties. The more disulfide bonds present, the stronger and more stable the protein will be. This is why keratin and glutenin, both with high disulfide bond content, have strong mechanical properties. In contrast, proteins with low disulfide bond content, such as silk, have weaker mechanical properties.

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If 1.0 l of solution contains exactly 1 molecule of the solute. The concentration in the solution is 1.66x10-24 M.

The quantity of a substance, like salt, that is present in a specific volume of tissues or liquid, like blood, according to science. When there is less water present, the material becomes more concentrated. For instance, when a person will not really drink enough water, the concentration of salt in their urine may increase.

Why is it so crucial to focus? You can use your resources more effectively and address difficulties more effectively when you are focused. It is less probable that you would overlook crucial facts when you are focused. Maintaining focus makes it easier for you to recall information.

1 mole = 6.02x10^23 particles,

((1 mole)/(6.02x10^23 molecules))

(1 molecule)/((1 mole)/(6.02x10^23 molecules))

= 1.66x10^-24 moles

=1.66x10^-24 moles/ volume,

= 1.0L here:

=(1.66x10^-24 moles solute)/(1.0 Liter)

= 1.66x10^-24 molar,

= 1.66x10^-24 M

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Answer:

it has to be b

Explanation:

the other ones don't make any sense

Answer:

11.92 Liters O₂(g) at STP

Explanation:

For most stoichiometry problems, if one will convert all given data into moles, solve by rxn ratios, then finish by converting to needed dimensions to complete problem.

2Pb(NO₃)₂ => 2PbO + 4NO₂ + O₂

Given 237.5 grams PbO formed in reaction = 237.5 g/223.2 g/mole = 1.064 mole PbO

From equation ratios, moles O₂ formed = 1/2(moles PbO) = 1/2(1.064 moles O₂) = 0.532 mole O₂

0.532 mole O₂ = 0.532 mole x 22.4  liters/mole at STP = 11.91756272 liters (calculator answer) ≅ 11.92 liters O₂ at STP (4 sig.figs. based on given 237.5g PbO)

Answer:

hhdbnahdhs

Explanation:

hajsbbdjsod

Answer:

The process when two or more atoms are joined together to make

Explanation:

Nuclear fission is the process where two or more atomic nuclei joined together to make a new or more atomic nuclear or particles. Energy is released. This process releases energy because the total mass of the r single nucleus or nuclei formed is lesser than the mass of the two original nuclei or the reactants.

Answer:

Atoms and subatomic particles combine and release a large amount of energy.

Please give me brainliest, I really need it.

The theoretical characteristic exhaust velocity, c* is 2850.7 m/s, and specific impulse Isp is 2556.5s for this new engine.

Using the following formula, the theoretical typical exhaust velocity, c*, can be determined:

sqrt(2 * * R * Tc / M) = c*.

where Tc is the combustion temperature in Kelvin, M is the molecular mass of the combustion products, and is the ratio of specific heats. R is the universal gas constant (8.314 J/mol.K).

Inputting the values provided yields:

c*= sqrt(2 * 1.225 * 8.314 * 3415 / 21.79), which equals 2850.7 m/s.

The following formula can be used to determine the particular impulse, Isp:

Isp equals c* * ln(m0/mf).

where the rocket's beginning mass is m0 and its ultimate mass, after the propellant has been burned, is mf.

Let's suppose that the mass ratio of the rocket to the propellant is 3:1 since we don't know the rocket's mass. The mass of propellant would then equal 3/4 of the rocket's original mass.

As a result, we get:

Isp = 2556.5 * ln(m0 / (3/4 * m0)) = 2850.7 * ln(4/3)

Therefore, the particular impulse, Isp, is 2556.5 s, and the predicted typical exhaust velocity, c*, is 2850.7 m/s.

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Answer:

a-it causes friction to increase

Explanation:

Imagine you have a smooth sheet of ice and you slide a smooth box across it. It'll slide petty far because there's not much friction. The two smooth surfaces aren't "grabbing" each other very much.

Now try to slide that same box over gravel. It's not going to go nearly as far. It gets caught by all the little bits of rock sticking up and falls into the divots.

Another example would be to think of sliding two smooth pieces of paper across each other as opposed to trying to slide a set of velcro the same way.

Whenever you have to answer questions about conceptual friction, it helps to picture it big and in real world examples!

Answer:

Frequency

types (longitudinal parrallel)

magnitude

peak of wave

Hz

Answer:

True

Explanation:because of the motion

The pH of the solution is 5.4.

This is a basic buffer problem. The reaction in the buffer is:

C6H5NH3+ (aq) + H2O (l) ↔ C6H5NH2 (aq) + H3O+ (aq)

The Kb expression for the weak base C6H5NH2 is:

Kb = [C6H5NH2][H3O+] / [C6H5NH3+]

We can assume that the initial concentration of C6H5NH3+ and C6H5NH2 is equal to their original concentrations. Let x be the amount of H3O+ formed by the reaction. Then the new concentration of C6H5NH3+ is (0.100 - x) mol/L and the new concentration of C6H5NH2 is (0.500 + x) mol/L.

Now, we can set up the Kb expression and solve for x:

4.3 × 10-10 = [(0.500 + x)(x)] / (0.100 - x)

Solving this equation gives x = 3.76 × 10-6 M.

This means that the new concentration of H3O+ is 3.76 × 10-6 M, and the new pH is:

pH = -log[H3O+] = -log(3.76 × 10-6) ≈ 5.4

Therefore, the resulting pH when 0.040 mol of solid NaOH is added to the buffer is approximately 5.4.

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1.The correct answer is (c). Two atoms unequally share two electrons.

2.The correct answer is (c). Two atoms unequally share two electrons.

3.The correct answer is (c). Triple covalent bond.

4.The correct answer is (d). The chlorine attracts the shared electrons more strongly than the hydrogen atom.

5.The correct answer is (d). Polar molecule.

6.The correct answer is (a). Atoms repelling each other.

1.In a single polar covalent bond, two atoms share electrons, but the sharing is unequal. One atom has a higher electronegativity, causing it to attract the shared electrons more strongly, resulting in a partial negative charge on that atom and a partial positive charge on the other atom. This unequal sharing of electrons creates polarity within the bond.

2.In a triple nonpolar covalent bond, the sharing of electrons is still equal. Each atom contributes one electron, resulting in a total of two shared electrons. The bond is nonpolar because the electronegativity difference between the atoms is negligible, and the electrons are shared equally.

3.Triple covalent bonds involve the sharing of three pairs of electrons between atoms. These bonds are stronger and require more energy to break compared to single or double covalent bonds, which involve the sharing of fewer electron pairs. The additional electron density in a triple bond makes it more difficult to break.

4.Hydrogen chloride (HCl) is a polar molecule because the chlorine atom is more electronegative than the hydrogen atom. As a result, the chlorine atom attracts the shared electrons more strongly, creating a partial negative charge on chlorine and a partial positive charge on hydrogen. This charge separation gives rise to the polarity of the molecule.

5.Diatomic iodine (I2) has a higher boiling point than diatomic bromine (Br2) because iodine is a larger atom with more electrons, resulting in stronger London dispersion forces between iodine molecules. Although both iodine and bromine are nonpolar molecules, the larger size of iodine allows for greater electron-electron interactions, leading to stronger intermolecular forces and a higher boiling point.

6.VSEPR (Valence Shell Electron Pair Repulsion) theory states that the three-dimensional shape of a molecule is determined by the repulsion between electron pairs in the valence shell of atoms. According to this theory, atoms and lone pairs of electrons repel each other to maximize the distance between them, resulting in specific molecular geometries. It is not limited to only bonding electron pairs but also includes the repulsion between bonding and lone pairs of electrons.

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The physical property of the materials that Alai most likely observing is the material's hardness.

Any measurable property that has a value that describes the state of a physical system is considered to be a physical property. A system's transitions between fleeting states can be described by changes in the physical characteristics of the system. Observables are another name for physical properties. They do not have any modal properties. A physical quantity is a property that can be measured.

There are two types of physical properties: intensive and extensive. When compared to an extensive property, an intensive property does not depend on the system's size, scope, or the volume of its constituent parts. Generally speaking, these classifications are only applicable when the sample's smaller subgroups do not interact physically or chemically.

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Alai is probably observing the materials' hardness, based upon that remark made.

The time period that a resource is physically usable is called its physical life. Since a functioning asset could be replaced by another more productive asset, this time frame might be significantly longer than the item's useful life. After some time, the asset can also cost too much to use commercially.

Aerobic, muscle- and bone-strengthening, stretching, and aerobic exercise are the four basic kinds of physical activity. Each assists in a different way to maintaining a healthy and active physique. Stretching focuses on joints and conditions that enhance, whereas aerobic exercise is most beneficial to your heart and lungs.

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Answer:

The law of conservation of mass states that mass can not be created nor destroyed. This law applies to chemical reactions as the mass of the atoms stays the same, even after the reaction.

A category 1 plastic container will generally be the most easily recycled.

HDPE is the most commonly recycled plastic and is usually deemed safe for food contact by the FDA. Because of its internal structure, HDPE is much stronger than PET, and can be reused safely.

1 – Polyethylene Terephthalate (PET) – water bottles and plastic trays.

2 – High Density Polyethylene (HDPE) – milk cartoons and shampoo bottles.

5 – Polypropylene (PP) – margarine tubs and ready-meal trays.

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Answer:

D or 4

Explanation:

right on edge 2021

Answer:

d

Explanation: