Which type of radiation has the highest penetrating ability?A: alphaB: betaC: gammaD: nuclear

a)Total pressure = 1.81 atm

b) partial pressure of N2  = 1.25 atm and partial pressure of O2 = 0.55 atm.

Partial pressure is the pressure exerted by individual gas in a mixture is known as its . In a mixture of gases, each gas has a partial pressure which is the notional pressure of that constituent gas .

Given Weight of N2 = 4 g

Weight of O2 = 2 g

We know atomic mass of N2= 28 and

atomic mass of O2 = 32

R(gas constant) = 0.0821

T= 273K

nN2= 4/28= 0.14

nO2= 2/32= 0.0625

total n = 0.14+ 0.0625

n = 0.2025

P total= n*RT/V

=  (0.2025* 0.0821* 273K)/2.5L

Total pressure = 1.81 atm

xN2=  0.14/(0.14+0.0625)

= 0.691

xO2= 0.0625/( 0.14+0.0625)

=  0.308

partial pressure of N2 = xN2 * P total

= 0.691* 1.81

partial pressure of N2  = 1.25 atm

partial pressure of O2= xO2 * P total

= 0.308 * 1.81

partial pressure of O2 = 0.55 atm

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Answer:It allows us to see things so we know where we are going that’s why at night we had lamp posts

Explanation:

Step 1

The reaction involved:

2 Al (s) + 3 CuSO4 (aq) => Al2(SO4)3 (aq) + 3 Cu (s) (completed and balanced9

---------------

Step 2

Information provided:

1.25 g Al

3.28 g CuSO4

---

Information needed:

The molar masses of:

Al) 27.0 g/mol

CuSO4) 160 g/mol

Al2(SO4)3) 342 g/mol

----------------

Step 3

The limiting reactant:

By stoichiometry:

2 Al (s) + 3 CuSO4 (aq) => Al2(SO4)3 (aq) + 3 Cu (s)

2 x 27.0 g Al ------ 3 x 160 g CuSO4

1.25 g Al ------ X

X = 1.25 g Al x 3 x 160 g CuSO4/2 x 27.0 g Al

X = 11.1 g CuSO4

For 1.25 g of Al, 11.1 g of CuSO4 is needed but there is 3.28 g, so the limiting reactant is CuSO4.

---------------

Step 4

The amount of Al2(SO4)3:

2 Al (s) + 3 CuSO4 (aq) => Al2(SO4)3 (aq) + 3 Cu (s)

3 x 160 g CuSO4 ------------ 342 g Al2(SO4)3

3.28 g CuSO4 ------------ X

X = 2.34 g

Answer: 2.34 g Al2(SO4)3

Mass of Hydrogen = 3.7 g

The empirical formula is the smallest comparison of atoms of compound forming elements.  

A molecular formula is a formula that shows the number of atomic elements that make up a compound.  

(empirical formula) n = molecular formula  

180.2 g/mol of glucose-C₆H₁₂O₆ contains 72.1 grams of carbon, 96 g/mol of oxygen and the remainder is hydrogen

Remainder Hydrogen :

\(\tt 180-(72.1+96)=11.9~g/mol\)

% mass of Hidrogen in Gllucose :

\(\tt \dfrac{11.9}{180}\times 100\%=6.61\%\)

So mass of Hydrogen in 55.5 g Glucose :

\(\tt 6.61\%\times 55.5~g=3.7~g\)

Answer:

The basic unit of any element would be the atom.

397.2 kcal.  is the bond dissociation energy for the breaking of all the bonds in a mole of methane, CH4.

One carbon atom makes up the molecule methane(CH4), which has four hydrogen atoms bound to the carbon by single bonds. It is a odorless, colorless, non-toxic, flammable gas and has a melting point of -161°C. CH4 performs three functions: fossil fuel, greenhouse gas, and bacterial metabolite.

For calculating the  bond dissociation energy for the breaking of all the bonds in a mole of methane, CH4.

do as follows.

heat of atomization of solid carbon =170.9kcal

and heat of atomization of four gaseous hydrogen is =4 × 52.1kcal

So, energy for breaking four carbon-hydrogen bonds

= 170.9 + (4 × 52.1) + 17.9 = 397.2 kcal.

Hence, 397.2 kcal.  is the bond dissociation energy for the breaking of all the bonds in a mole of methane, CH4

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The answer is b. iron.

Oxidation state or number refers to the number of electrons that an atom has lost, gained, or shared in forming a chemical compound. It is an indication of the degree of oxidation of an atom in a molecule. Elements can have one or more oxidation states.

Iron (Fe) is a transition metal and is located in the middle of the periodic table. Transition metals are known to have multiple oxidation states due to their partially filled d orbitals. Iron has two common oxidation states: +2 and +3. It can also exhibit other oxidation states, such as +4 and +6, but these are less common.

Cadmium (Cd), silver (Ag), and zinc (Zn) are not transition metals and are located in the s-block or p-block of the periodic table. These elements have only one common oxidation state: +2 for Cd and Zn, and +1 for Ag.

Therefore, the correct answer is b. iron, which has more than one positive oxidation state.

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Answer:

87.33 kPa (2 d.p.)

Explanation:

To solve this problem, use the combined gas law.

\(\boxed{\sf \dfrac{P_1V_1}{T_1}=\dfrac{P_2V_2}{T_2}}\)

where:

As we want to find the final pressure, rearrange the formula to isolate P₂:

\(\sf P_2=\dfrac{P_1V_1T_2}{T_1V_2}\)

As the temperatures have been given in Celsius, we need to first convert the temperatures from Celsius to kelvin by adding 273.15:

\(\implies \sf T_1=48+273.15=321.15\;K\)

\(\implies \sf T_2=64+273.15=337.15\;K\)

The given values are:

Substitute the values into the formula and solve for P₂:

\(\implies \sf \sf P_2=\dfrac{108 \cdot 0.952 \cdot 337.15}{321.15 \cdot 1.236}\)

\(\implies \sf \sf P_2=\dfrac{34664.414}{396.9414}\)

\(\implies \sf P_2=87.3287946...\)

\(\implies \sf P_2=87.33\;kPa\;(2\;d.p.)\)

Therefore, the final pressure of the gas is 87.33 kPa (2 d.p.).

4.5 meters is equal to 4,500 millimeters when rounded to two significant figures. The conversion is done by multiplying the meter value by 1,000, as there are 1,000 millimeters in one meter.

convert 4.5 meters (m) to millimeters (mm), we need to multiply by the conversion factor of 1,000 since there are 1,000 millimeters in one meter.

4.5 m * 1,000 mm/m = 4,500 mm

We need to round the answer to two significant figures as requested.

4,500 mm rounded to two significant figures is 4,500 mm.

The, 4.5 meters is equal to 4,500 millimeters when rounded to two significant figures.

convert 4.5 meters (m) to millimeters (mm), we use the conversion factor of 1,000 since there are 1,000 millimeters in one meter. Multiplying 4.5 by 1,000 gives us 4,500 millimeters.

We need to consider the significant figures. The original value, 4.5 meters, has two significant figures. When converting, we retain all the digits in the conversion factor since it is an exact conversion. Therefore, the converted value of 4,500 millimeters has four significant figures.

We are instructed to round the answer to two significant figures. To do this, we look at the third significant figure, which is 0. Since 0 is less than 5, we do not need to round up. Therefore, the final answer, rounded to two significant figures, is 4,500 millimeters.

Important to note that significant figures convey the precision of a measurement. In this case, the rounding to two significant figures indicates the precision of the original measurement, and the converted value is reported accordingly.

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Answer:

The average velocity of the airplane for this trip is 1684.21 km/h

Explanation:

Average velocity is the rate of change of displacement with time. That is,

Average velocity = \(\frac{Displacement }{Change in time}\) = Δx / Δt = \(\frac{x2 - x1}{t2 - t1}\)

Now we will calculate the time taken by the airplane for the first motion before it encounters a wind.

From,

Velocity = \(\frac{Distance traveled}{Time taken}\)

Time = \(\frac{Distance traveled}{Velocity}\)

Therefore, Time = \(\frac{2100km }{1000km/h}\)

Time = 2.1h

This is the time taken before the airplane encounters a wind.

Hence, t1 = 2.1h

Now, For the time taken by the airplane when it encounters a wind

Also from,

Velocity = \(\frac{Distance traveled}{Time taken}\)

Time = \(\frac{Distance traveled}{Velocity}\)

Therefore, Time = \(\frac{1300km }{800km/h}\)

Time = 1.625h

Hence, t2 = 1.625h

Now, to calculate the average velocity

Average velocity = \(\frac{x2 - x1}{t2 - t1}\)

x1= 2100, x2= 1300, t1= 2.1h and t2= 1.625h

Hence, Average velocity = \(\frac{1300 - 2100}{1.625 - 2.1}\)

Average velocity = 1684.21 km/h

Number of electrons in a Ca²⁺ = 18

In an atom there are levels of energy in the shell and sub shell  

This energy level is expressed in the form of electron configurations.  

Writing electron configurations starts from the lowest to the highest sub-shell energy level. There are 4 sub-shells in the shell of an atom, namely s, p, d and f. The maximum number of electrons for each sub shell is  

• s: 2 electrons  

• p: 6 electrons  

• d: 10 electrons and  

• f: 14 electrons  

Charging electrons in the sub shell uses the following sequence:  

1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁶, 5s², 4d¹⁰, 5p⁶, 6s², etc.  

The element Ca has an atomic number of 20, so the number of electrons and protons (in neutral atoms) is also 20

Electron configuration of Ca : 1s², 2s², 2p⁶, 3s², 3p⁶, 4s² ⇒[Ar] 4s²

When Ca releases 2 electrons to gain stability (forming Ca²⁺ cations), the number of electrons becomes:

\(\tt 20-2 = 18\)

and the electron configuration (Ca²⁺ ) becomes:

1s², 2s², 2p⁶, 3s², 3p⁶

Answer:

Structure of boron trifluoride, an example of a molecule with trigonal planar geometry.

Explanation:

For some cases, there really isn’t much of a difference: For many recipes, starches and flour can be used interchangeably without a drastic effect.

The particles in a hot coffee possess greater kinetic energy compare to the particles of an ice cream due to the nature of their states of matter.

The particles of liquid substance are held together by weak intermolecular force of attraction and therefore are far from each other which cause them to be able to move about freely in the hot cup of coffee. Due to easy movement they will have more kinetic energy and move at a faster rate due to application of heat. Due to this heat, the particles in the hot coffee will be free to move about and strikes the wall of the container which in turns increases their kinetic energy since kinetic energy is the energy possessed by a body by virtue of its motion.

An ice cream is a semisolid and in a semisolid compare to liquid substance, the molecules/particles of the substance are held together by intermolecular force of attraction and hence, this particles will not be able to move freely and as such will possess low kinetic energy compare to the particles in the hot coffee.

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Most packaged water source heat pumps utilize a thermostatic expansion valve (TXV) as the metering device.

The TXV is a precise and efficient device that regulates the flow of refrigerant into the evaporator coil of the heat pump. It is designed to maintain a specific superheat at the outlet of the evaporator, ensuring optimal performance and efficiency.

The TXV operates based on temperature and pressure differentials, allowing it to adjust the flow of refrigerant based on the cooling load of the system.

This helps to maintain a proper balance between refrigerant flow and heat transfer, resulting in improved system performance and better temperature control.

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The weight of magnesium chloride required to prepare the 200 ml solution that is 5.0 M is approximately 48 grams.

To calculate the weight of magnesium chloride (\(MgCl_{2}\)) required to prepare a 200 ml solution that is 5.0 M, we need to use the formula: Weight (in grams) = Volume (in liters) × Concentration (in moles/liter) × Molecular Weight (in grams/mole)

First, we convert the volume from milliliters to liters by dividing it by 1000: Volume = 200 ml ÷ 1000 = 0.2 L. Next, we multiply the volume, concentration, and molecular weight: Weight = 0.2 L × 5.0 mol/L × 95.3 g/mol = 47.65 grams

Rounding to the nearest whole number, the weight of magnesium chloride required to prepare the 200 ml solution that is 5.0 M is approximately 48 grams.

This calculation ensures that the desired concentration is achieved by accurately measuring the appropriate amount of magnesium chloride, taking into account its molecular weight and the desired volume of the solution.

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The additional information that is required to obtain the enthalpy of neutralization is the density of the solution.

We know that the enthalpy of neutralization is defined as the heat that is evolved when  an acid is neutralized by a base under standard conditions. We can be able to obtain the enthalpy of the neutralization of the acid and the base by performance of some simple chemical calculations.

To carry out this calculations we need the all of the pieces of information that have been listed in the question such as the masses of the solution, the temperature of the solution in the initial and final states and so on.

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Answer:

designing a solution

Explanation:

i found the answer on quizlet lol

Based on the given information, the engineers are in the "designing a solution" stage of technological design.The correct answer is option B.

Materials are substances or matter that are used to make objects, structures, or products. Materials possess physical and chemical properties that determine their behavior and suitability for various applications.

B. Designing a solution is an appropriate answer because after identifying the need for a new material to build an oil tanker, they are now supposed to develop plans and designs for the material that meets the desired characteristics of being lightweight, strong, and durable. The engineers are in second stage of technological design.

Therefore, based on the information provided, the engineers are currently in the "designing a solution" stage of technological design. Option B is the correct answer.

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Answer:

Hello! Your answer would be BELOW

Explanation:

So a molten salt powers electricity. Hence, molten sodium chloride conducts electricity due to the presence of free ions. So, the correct answer is option D.      Atoms of sodium and chloride.

Hope I helped! Hope you make an 100%

-Amelia♥

The total bond energy of the reactants and products must be subtracted to obtain the energy change in the reaction \(2H_2O --- > 2H_2 + O_2\) using the provided bond energy.

Reactants:

2H-O-H (2 molecules) = 2 * (2 * O-H) = 2 * (2 * 463 kJ/mol) = 1852 kJ/mol

Products:

2H-H (2 molecules) = 2 * (2 * H-H) = 2 * (2 * 436 kJ/mol) = 1744 kJ/mol

O=O = 1 * O=O = 1 * 495 kJ/mol = 495 kJ/mol

1852 kJ/mol is the total binding energy of the reactants.

The combined binding energy of the products is 1744 kJ/mol + 495 kJ/mol, which is equal to 2239 kJ/mol.

Energy change (ΔE) = Total bond energy of the products - Total bond energy of the reactants

ΔE = 2239 kJ/mol - 1852 kJ/mol = 387 kJ/mol

So, the answer is E.

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Your question is incomplete, most probably the complete question is:

Calculate the energy change of the following reaction

based on the bond energies given.

2H2O2H2 + O2

H-H: 436kJ/mol

O=0: 495kJ/mol

O-H: 463kJ/mol

Select one:

Answer:

They are multilayered

Spacesuits provide protection from radiation and offer normal air pressure inside

Explanation:

The equivalence point on a weak base/ strong acid titration curves occurs at a pH c) less than 7

The equivalence point on a weak base/strong acid titration curve occurs when the number of moles of the strong acid added is equal to the number of moles of the weak base in the solution. At the equivalence point, all the weak base has been converted to its conjugate acid. The pH at the equivalence point depends on the strength of the weak base and the strong acid used.

In general, weak bases have a pH greater than 7 because they produce solutions with lower concentrations of H+ ions. When a strong acid is added to a weak base, the pH decreases as the solution becomes more acidic. However, at the equivalence point, all the weak base has been converted to its conjugate acid, which is acidic. Therefore, the pH at the equivalence point for a weak base/strong acid titration is less than 7.

So the answer is (c) less than 7.

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True. It would take more energy to boil water( which is polar) than to boil a liquid made of non-polar molecules.

Thus we can conclude that it takes more energy to boil water than to boil a liquid made of non-polar molecules.

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Answer:

At -20°C the mercury state will be liquid

Explanation:

The melting point of a substance is the temperature at which it changes from solid state to a liquid state, and the boiling point is the temperature at which it changes from liquid state to a gaseous state.

If mercury melts at -39°C and boils at 356.9°C, it means that if the temperature is lower than -39°C, mercury will remain al solid state. Between -39°C and 356.9°C, the state of mercury will be liquid and, above 356.9°C mercury will remain at gaseous state.

So, at -20°C the mercury state will be liquid, because that temperature it is between -39°C and 356.9°C.

If Ca2+ ions are injected into a cell, wholesale exocytosis of secretory product occurs. Exocytosis is the process by which cells release substances to the extracellular space.

Calcium ions play a crucial role in regulating exocytosis. When Ca2+ ions bind to specific proteins called synaptotagmins in the plasma membrane, it triggers the fusion of secretory vesicles with the membrane, leading to the release of their contents. This process is essential for the release of neurotransmitters in neurons and the secretion of various hormones and enzymes in other cell types.

When Ca2+ ions are artificially introduced into a cell by injection, they can bind to synaptotagmins, mimicking the natural signaling process. As a result, there is an uncontrolled and widespread activation of exocytosis, leading to wholesale exocytosis of secretory product. This means that all the secretory vesicles within the cell, containing various substances, will fuse with the plasma membrane and release their contents simultaneously. This can have significant consequences on the cell's function and can result in the rapid and massive release of substances that were originally meant to be released in a regulated manner.

The injection of Ca2+ ions into a cell would trigger wholesale exocytosis of secretory product. The uncontrolled activation of exocytosis caused by the artificially introduced Ca2+ ions would lead to the simultaneous release of the cell's secretory vesicles, resulting in the widespread and unregulated secretion of their contents.

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Answer:

Density should be 8.5

Explanation:

When you subtract 17.2-10.0 for water displacement you get 7.2 which is the volume and you divide it by 15.7 so your equation will be 15.7/7.2 = 8.5

Answer:

4.1

Explanation: