When they survive,
organisms are more likely
to be able to reproduce
and pass on their genetic
information to their

The number of air molecules in a volume of 1.00 cm3 under the conditions of the vacuum pump is 3.65 * 10-15 moles and those that would be present at the same temperature but at 1.00 atm would be 0, 04 moles

The vacuum pump is a device that extracts gas molecules from a sealed volume, to create a partial vacuum, and is frequently used in industry, especially food.

To perform both calculations considering air as an ideal gas, the equation PV = nrt is used, in which

P = Pressure

V = Volume

n = number of moles

R = Gas constant

t = temperature

Data

t = 300K

V = 1L

P = 9.00 * 10-14 atm

R = 0.082 L Atm / mol °K .

n = ?

PV = nrt

n = PV/rt

n = 9.00 * 10-14. 1 / 0.082 . 300

n = 9.00 * 10-14 / 24.6

n = 3.65 * 10-15 moles

Data

t = 300K

V = 1L

P = 1 atm

R = 0.082 L Atm / mol °K .

n = ?

PV = nrt

n = PV/rt

n=1. 1 / 0.082 . 300

n = 1 / 24.6

n = 0.04 mole

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\(\\ \sf\longmapsto No\:of\;moles=\dfrac{Given\:mass}{Molar\:mass}\)

\(\\ \sf\longmapsto No\:of\:moles=\dfrac{31.99}{32}\)

\(\\ \sf\longmapsto No\:of\:moles\approx 1\)

#NaCl

\(\\ \sf\longmapsto No\:of\:moles=\dfrac{176.8}{58.5}\)

\(\\ \sf\longmapsto No\;of\:moles=3mol\)

Answer:

False

Explanation:

Because it is false heat will always transfer so it require matter

Answer:

points srrypoints srry

Explanation:

points srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints srrypoints sr

Answer:

The molar mass of the compound given is 182.182 g/mol.

Explanation:

To calculate the molar mass of the compound, we must multiply the number of moles of each element by the the individual molar mass of each element and add them together.

Let's start with Calcium.  The molar mass of Calcium is 40.078.  In this compound, we have three moles of Calcium, so we should multiply this number by 3.

40.078 g/mol * 3 mol = 120.234 g

Now, let's do the same for Phosphorus.

30.974 g/mol * 2 g/mol = 61.948 g

To find the molar mass of the entire compound, we should add these two values together.

120.234 g + 61.948 g = 182.182 g

Therefore, the correct answer is 182.182 g/mol.

Hope this helps!

Answer: Life on Earth has existed for approximately 3.5 billion years.

Explanation:

Answer:

10 km/hr

............

The speed of a bicycle is 10 km/hour or 0.27 m/sec.

The speed may be defined as the rate of change of position of an object in any direction. It is significantly measured as the ratio of distance to the time in which the distance was covered.  Speed is a type of scalar quantity that has only direction but no magnitude.

According to the question, the distance traveled by bicycle = 20 km or 2000 meters.

The total time is taken = 2 hours or 7200 seconds.  

Now, the formula for calculating the speed is as follows:

S = Distance/ Time = 20km/2 hours = 10 km/hour.

S = Distance/ Time = 2000 meters/7200 seconds = 0.277 m/sec.

Therefore, the speed of a bicycle is 10 km/hour or 0.27 m/sec.

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Answer:

Xenon

Explanation:

The core electrons of an element are the electrons that do not take part in the chemical reactions of the element

The electronic configuration of barium Ba is presented as follows;

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s²

2+2+6+2+6+2+10+6+2+10+6

The valence electrons of boron are the 6s² electrons

The core electrons of boron are the; 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶

The electronic configuration of xenon, Xe, which is the previous noble element before barium, is presented as follows;

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ which is the same as the core electrons of barium

Therefore, the total number of electrons in xenon is equal to the number of core electrons in barium

The balanced form of the equations are:

To write a balanced chemical equation, follow these steps:

Write the correct chemical formula for each reactant and product. Write the unbalanced equation using chemical symbols and formulas. Balance the equation by adjusting the coefficients so that the number of atoms of each element is the same on both sides of the equation. Check that the equation is balanced by counting the number of atoms of each element on both sides of the equation.

Note that in a balanced equation, the number of atoms of each element and the total charge are the same on both sides of the equation. Also, be sure to write the state of matter for each reactant and product (solid, liquid, gas, aqueous solution).

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Image transcribed:

Balance the following equations

1. N₂ + H₂ → NH₃

2. S₈ + O₂ → SO₃

3. HgO → Hg + O₂

4. Zn + HCI → ZnCl₂ + H₂

5. SiCl₄ + H₂O → H₄SiO₄ + HCL

6. Na + H₂O → NaOH + H₂

7. H₃PO₄ → H₄P₂O₇ + H₂O

8. Si₂H₃+ O₂ → SiO₂+ H₂O

9. AI(OH)₃ + H₂SO₄ → Al₂(SO₄)₃ + H₂O

10. Fe + O₂ → Fe₂O₃

11. Fe₂(SO₄)₃ + KOH → K₂SO₄ + Fe(OH)₃

12. FeS₂ + O₂ → Fe₂O₃ + SO₂

13. Al + FeO → Al₂O₃ + Fe

14. Na₂CO₃ + HCI → NaCl + H₂O+ CO₂

15. K + Br₂→ KBr

16. P₄ + O₂ → P₂0₅

17. C₂H₂ + O₂ → CO₂ + H₂O

Some types of plastics can change their properties, such as shape, color, or electrical conductivity, due to changes in temperature, pressure, or chemical environment. No, the change in plastic does not necessarily depend on its ability to absorb, reflect, or transmit light.

For example, shape-memory polymers can change their shape in response to temperature changes, without requiring any interaction with light. Similarly, electrochromic polymers can change their color or transparency in response to an electric field, without the need for light absorption. Therefore, the ability of a plastic to change depends on its intrinsic properties and its response to external stimuli, rather than its optical properties.

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The conditions for a standard electrochemical cell. select one or more : pressure of 1 atm temperature of 298 k solution concentrations of 1 M.

The electrochemical cell is the cell that is capable of generating the electrical energy from the chemical reactions or by the use of the electrical energy to cause the chemical reaction. The conditions for a standard electrochemical cell. select one or more : pressure of 1 atm temperature of 298 k solution concentrations of 1 M.  

There are the two types of the electrochemical cells is as follows : the galvanic called the electrolytic cells. the galvanic cell is also called as the voltaic cell.

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1. The correct answer is basic. Barium cyanide, Ba(CN)2, is an ionic compound composed of a barium cation and a cyanide anion.

When it is dissolved in water, it will dissociate into barium cations and cyanide anions. The barium cation has a +2 charge, so it will accept two hydrogen ions from the water, forming the barium hydroxide ion, Ba(OH)2, making the barium cation basic in nature.

2. The correct answer is acidic. Barium cyanide, Ba(CN)2, is an ionic compound composed of a barium cation and a cyanide anion.

When it is dissolved in water, it will dissociate into barium cations and cyanide anions. The cyanide anion has a -1 charge, and will donate a single hydrogen ion to the water, forming the hydronium ion, H3O+, making the cyanide anion acidic in nature.

3. The correct answer is neutral. An aqueous solution of barium cyanide, Ba(CN)2, will be neutral. When the compound is dissolved in water, it will dissociate into barium cations and cyanide anions.

The barium cation will accept two hydrogen ions from the water, forming the barium hydroxide ion, Ba(OH)2, and the cyanide anion will donate one hydrogen ion to the water, forming the hydronium ion, H3O+. These two processes will cancel each other out, resulting in a neutral solution.

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Answer:

1: exothermic

2:hydrated iron (III) oxide

3:reactants

4:precipitate

5: hydrogen gas

Answer:1.exothermic

2.hydrated iron (III) oxide

3.reactants

4.precipitate

5. hydrogen gas

The number of molecules in 10.0 gram of NaOH is 15 * 10²².

To solve this question, we need to understand some terms of mole concept,

Mole - It is the amount of substance containing same number of molecules or atoms as there are atoms in 12 gram of carbon-12 isotope.

Molecules - It is group of atoms bonded together, representing the smallest fundamental unit of a chemical compound taking part in chemical reaction.

Molecular weight - The sum of atomic masses of all atoms in molecules.

Avogadro number - It is the number of atoms, ions, electrons, molecules in one mole of substance. It is represented as NA.

NA = 6.0 * 10²³ (approx)

To calculate the number of molecules, we apply the formulae,

no. of molecules = moles * NA

moles = weight / molecular weight

moles = 10.0 / 40

          = 0.25

Substituting this value to calculate number of molecules,

no. of molecules = 0.25 * 6.0 * 10²³

                            = 15 * 10²²

Therefore the number of molecules of in 10.0 g of NaOH is 15 * 10²².

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Propane is a member with this characteristic.

Propane, an odorless and colorless gas, serves as a widely utilized fuel. It emerges as a byproduct of natural gas refinement and petroleum processing. This compound belongs to the alkane family, characterized by its hydrocarbon nature.

With a chemical formula of C₃H₈, propane adheres to the general formula of a homologous series, CnH2n+2, where 'n' denotes the number of carbon atoms within the molecule. Distinct from propane, acetylene, benzene, and toluene possess varying carbon atom counts, thereby precluding them from being members of this particular homologous series.

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Answer: I would love to help but i cant see the table

Explanation:

Jana can modify her device by increasing the amount of zinc and decreasing the amount of copper sulfate to generate more heat, which will increase the water temperature within the desired range of 70°C to 100°C.

How could Jana modify her design to meet the temperature constraints?

By making these modifications, Jana can increase the water temperature to the desired range and ensure that her device is portable, safe, and effective.

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Answer:

Q = -4903.14 j

Explanation:

Given data:

Mass of water = 23 g

Initial temperature = 78°C

Final temperature = 27°C

Heat lost = ?

Solution:

Specific heat capacity of water is 4.18 J/g.°C

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT =  27°C - 78°C

ΔT = -51°C

Q = 23 g × 4.18 J/g.°C  × -51°C

Q = -4903.14 j (negative sign shows heat is released)

Answer:

Electricity

Moving electrons are known as electric current, also known as Electricity.

Answer:

Mass of lime produced = 19.0 g

Explanation:

Given data:

Mass of lime produced = 11.2 g

Mass of limestone react = ?  

Solution:

Chemical equation:

CaCO₃     →      CaO + CO₂

Balanced chemical equation:

CaCO₃     →      CaO + CO₂

Number of moles of lime:

Number of moles = mass / molar mass

Molar mass of lime 56.1 g/mol

Number of moles = 11.2 g/ 56.1 g/mol

Number of moles = 0.19 mol

Now we will compare the moles of CaO and CaCO₃  from balance chemical equation.

                    CaO        :           CaCO₃

                      1             :             1

                     0.19          :          0.19

Mass of limestone react:

Mass = number of moles × molar mass

Mass = 0.19 mol × 100.1 g/mol

Mass = 19.0 g

Answer:

5 meter/second.

Explanation:

You dived the seconds, 10, by the meters, 50.

Answer:

fossil fuels are an  nonrenewable resource that people are hoping to replace with renewable resources

Explanation:

Answer:

See explanation

Explanation:

1. The Ketone was not sown in the question but i can give you a general idea of how to calculate its molecular weight. A ketone has a general molecular formula of CnH₂nO.

The molecular weight is calculated knowing that the relative atomic mass of carbon is 12, that of hydrogen is 1 while that of oxygen is 16.

Hence from the general molecular formula, the molecular weight of any ketone is calculated from; n(12) + 2n(1) + 16. Where n represents the number of atoms of each element in the ketone.

2. Sublimation of dry ice occurs when the molecules in dry ice absorb sufficient energy in the form of heat such that they now have enough energy for some molecules to overcome the inter molecular forces acting in the solid crystal and transform directly into the vapor phase. This process is endothermic.

3.  

cyclohexane and CH2Cl2 molecules are held together by dispersion forces.

CH3CH2OCH2CH3 and  CH3CN are polar molecules held together by  dipole-dipole forces.

To determine the pressure of the ammonia gas at a new volume and temperature, we can use the combined gas law, which states that the ratio of the initial pressure, volume, and temperature is equal to the ratio of the final pressure, volume, and temperature.

Using the combined gas law equation: (P1 * V1) / T1 = (P2 * V2) / T2

Given:

P1 = 585 torr (initial pressure)

V1 = 20.0 ml (initial volume)

T1 = 20.0 °C + 273.15 = 293.15 K (initial temperature)

V2 = 50.0 ml (final volume)

T2 = 50.0 °C + 273.15 = 323.15 K (final temperature)

We need to solve for P2 (final pressure).

Rearranging the equation, we have:

P2 = (P1 * V1 * T2) / (V2 * T1)

Substituting the given values into the equation:

P2 = (585 torr * 20.0 ml * 323.15 K) / (50.0 ml * 293.15 K)

Calculating this expression gives us the final pressure (P2) of the ammonia gas at the new volume and temperature.

In summary, using the combined gas law equation, we can determine the pressure of the ammonia gas at a new volume and temperature. By substituting the given values into the equation and performing the calculation, we can find the final pressure of the gas.

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\(hopefully \: \: that \: \: helps\)

The statement "for a given substance the entropy always increases in the following order: s (gas) < s (liq) < s (solid)" is generally true but there are exceptions.

Entropy is a measure of the degree of randomness or disorder in a system. In general, the more disorderly a system is, the higher its entropy. Therefore, for a given substance, its entropy will tend to increase as it goes from a solid to a liquid to a gas because the particles become more disordered and can move more freely.
However, there are some exceptions to this trend. For example, water is a substance that has a higher entropy in its solid form (ice) than in its liquid form. This is because the crystal structure of ice allows for more disorderly arrangements of water molecules than in liquid water. Another exception can occur when a substance undergoes a phase transition, such as melting or boiling. During these transitions, the entropy of the substance may temporarily decrease even though it eventually increases as the substance becomes more disordered in its new phase.
In summary, while the statement is generally true, there are exceptions to the trend of increasing entropy from solid to liquid to gas, and it is important to consider the specific properties of each substance when discussing its entropy.

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Answer:

Alex forgot to get a flu shot and missed two weeks of school

Infraclass: Placentals

Placental mammals are the most diverse group of mammals with about 4000 discovered species.