which of the following statements is (are) false? i. the layering in a hexagonal closest-packed structure is aba. ii. a body-centered cubic unit cell has four atoms per unit cell. iii. for unit cells having a simple cubic (primitive) structure, there would be one atom (net) for each unit cell. iv. atoms in a solid consisting of only one element would have six nearest neighbors if the crystal structure were a simple cubic array.

Name - Function

The brain regulates a variety of bodily processes, such as movement, sensation, thinking, emotion, and behavior.

Activity and Part of the brain it involves are:

a. Testing a hamburger - Sensory cortex in the parietal lobe

b. Artistic ability - Right hemisphere of the cerebrum

c. Kicking a soccer ball - Motor cortex in the frontal lobe

d. Rate of breathing - Medulla oblongata in the brainstem

e. Tying your shoes - Cerebellum

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The sum of 3(3)/(8) and 6(1)/(2) is 5(5)/(8), which is a mixed number representing 5 whole units and 5/8 of another unit.

To find the sum of mixed numbers, we need to add the whole numbers and the fractions separately. Add the whole numbers: 3 + 6 = 9

Add the fractions: For the fractions 3/(8) and 1/(2), we need to find a common denominator. The least common multiple of 8 and 2 is 8.

Converting 3/(8) to have a denominator of 8:

3/(8) = (3 x 1)/(8 x 1) = 3/(8)

Converting 1/(2) to have a denominator of 8:

1/(2) = (1 x 4)/(2 x 4) = 4/(8)

Now, we can add the fractions:

3/(8) + 4/(8) = (3 + 4)/(8) = 7/(8)

Combine the whole numbers and fractions:

The whole numbers sum was 9 and the fractions sum was 7/(8). We can write this as a mixed number by dividing the numerator (7) by the denominator (8). The quotient is 0 with a remainder of 7. Therefore, the mixed number is 0(7)/(8), which can be simplified to 7/(8).

Therefore, sum of 3(3)/(8) and 6(1)/(2) is 5(5)/(8).

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The balanced chemical equation showing the reaction between iron (iii) oxide and carbon monoxide to form iron (ii) oxide and carbon oxide is :

                    FE2O3 + 3CO → 2FE +3CO2

Unbalanced:

                    Fe2O3 + CO → Fe + CO2

The atoms of iron on the reactant side is 2 but on the product side is 1, so have to change the coefficient of the iron of the product side. Place 3 with the CO in reactants and 3 with CO2 on the product side.

A balanced chemical equation is defined as the number of atoms of each type in the reaction being equal to the reactants and product sides.

The mass and charge is equal in a balanced chemical reaction.

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Answer: 7.1

Explanation:

Answer:

seismographs

Explanation:

Scientists use seismographs that record the length and strength of each earthquake to try to determine if an eruption is imminent. Magma and gas can push the volcano's slope upward.

The limiting reactant refers to the reactant that is in small amount. The extent of the reaction depends on the amount of the limiting reactant.

The term limiting reactant refers to the reactant that is in small amount, We shall now solve the questions individually.

1) The reaction equation is;

CaO + H2O → Ca(OH)2

Number of moles of CaO = 10 g/56 g/mol = 0.18 moles

Number of moles of H2O = 10 g/18 g/mol = 0.56

Since the reaction is 1:1, CaO is the limiting reactant

Mass of calcium hydroxide = 0.18 moles * 74 g/mol = 13.32 g

2) The reaction equation is;

Mg + Br2 → MgBr2

Number of moles of Mg = 1 g/24 g/mol = 0.042 moles

Number of moles of Br2= 5 g/160 g/mol = 0.031 moles

Since the reaction is 1:1, Br2 is the limiting reactant

Mass of MgBr2 =  0.031 moles * 184 g/mol = 5.7 g

3) The reaction equation is;

CuO + H2 → Cu + H2O

Number of moles of CuO= 2.00 g/80 g/mol = 0.025 moles

Number of moles of H2 = 1.00g/2 g/mol = 0.5 moles

Since the reaction is 1:1, CuO is the limiting reactant

Mass of Cu = 0.025 moles * 63.5 g/mol = 1.59 g

4) The reaction equation is;

2Na + F2 → 2NaF

Number of moles of Na = 2.30 g/23 g/mol = 0.10 moles

Number of moles of F2 =  2.85 g/38 g/mol = 0.075 moles

If 2 moles of Na react with 1 mole of F2

x moles of  Na reacts with 0.075 moles of F2

x = 0.15

Hence Na is the limiting reactant

Mass of NaF = 0.10 moles * 42 g/mol = 4.2 g

5) The equation of the reaction is;

Fe2O3 + 2Al → 2Fe + Al2O3

Number of moles of Fe2O3  =  8.00 g/160 g/mol = 0.05 moles

Number of moles of Al = 2.16 g/27 g/mol = 0.08 moles

If 1 mole of Fe2O3  reacts with 2 mole of Al

x moles of Fe2O3 reacts with 0.08 moles of Al

x = 0.04 moles

Hence, Fe2O3 is the limiting reactant

1 mole of Fe2O3  yileds 2 moles of Fe

0.05 moles yileds 0.05 moles  * 2 moles/1 mole = 0.1 moles

Mass of Fe = 0.1 moles * 56 g/mol = 5.6 g

6) The equation of the reaction is;

2Al + 3Cl2 → 2AlCl3

Number of moles of Al = 13.5 g/27 g/mol = 0.5 moles

Num ber of moles of Cl2 =  42.6 g /71 g/mol = 0.6 moles

If 2 moles of Al reacts with 3 moles of Cl2

x moles of Al reacts with 0.6 moles of Cl2

x = 0.4 moles

Al is the limiting reactant

Mass of AlCl3 = 0.4 moles * 133 g/mol = 53.2 g

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The precipitate in the reaction between MgCl2 (aq) and 2NaOH (aq) is Mg(OH)2 (s).

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Answer:

r

I think 1 option okkkkkkkkkkkkk

Explanation:

mhfs4trfsetc fthcfeencfgeh,cbwjh vbytbnmdtuh3lg dl5flnfwk3t kqre,fvbt,klkkkjh

Tectonic forces do not cause plates to slide over and under each other, to produce heat and pressure which forms igneous rocks

The rock cycle is a cycle which describes how the three basic rock types are related and how earth processes convert one rock type into another over geologic time.

Plate tectonic forces together with weathering and erosional processes, are responsible for the rock cycle.

Tectonic forces play the following roles in rock cycle:

Therefore, the statement that when plates slide over and under each other, the heat and pressure form igneous rocks is not True.

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The statement "the distilled water was blank relative to the cells of the potato" means that the distilled water had no solutes or nutrients in it, so it was not able to affect the cells of the potato in any way. In a scientific experiment, a blank is used as a control to determine a baseline measurement for comparison with other samples.

When testing the effects of different solutions on potato cells, distilled water is often used as a blank because it has no solutes or nutrients that could affect the cells. The distilled water is simply used as a reference point to compare with other solutions.

In this case, since the distilled water was blank relative to the cells of the potato, it means that it had no effect on the cells. Therefore, any changes observed in the potato cells when other solutions were added can be attributed to the properties of those solutions rather than any interactions with the blank.

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Silicon. With silicon accounting for over 95% of the modules supplied today, silicon is by far the most prevalent semiconductor material used in solar cells.

Solar energy is the radiant light and heat from the Sun that is captured by a variety of technologies, including solar architecture, solar thermal energy, and solar power to produce electricity.

Simply said, solar energy is the heat and light emitted by the sun. Several methods exist for utilizing the energy that the sun provides: Using photovoltaic cells, sunlight may be converted into power. solar thermal technique, in which hot water or steam is produced using solar energy.

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Answer:

B. No more powder will dissolve in the water.

Explanation:

If a lot of powder is added to the water, then a fully saturated solution would be created. This means that no matter how much more powder is added or how strong the mix is shaken, no more powder will disolve. The powder will instead remain in solid form in the solution.

Answer:

Heat up the water first because it increases solubility of the powdered mix.

Explanation:

Took the test on Edg. Hope this helps!! :)

It is more effective to perform an extraction with several small portions of solvent as opposed to one large portion of solvent of equal volume because the amount of the material left in the trash will be less.

The extraction of certain ratio of the solute is able to the distribute among the phases during each extraction. The various extractions with the lesser amounts of the solvent are more efficient than the single extraction with the huge amount of solvent.

The extraction is about to maximize the outside field of the communication between the two solvents, we can easily get the more surface area in the contact with the fewer amounts.

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The number of moles of calcium atoms in a tablet would be 0.015 moles. Option A.

The number of moles in a particular mass of substances is the ratio of the mass of the substances and their molar masses.

Mole = mass/molar mass

The molar weight of calcium is 40 amu.

For 0.6 g of calcium:

Mole = 0.6/40

         = 0.015 mol

In other words, the number of moles of calcium atoms in a tablet would be 0.015 moles.

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C. physical change

Explanation:

That's the answer

Given data:H2O vapor content: 13 gramsH2O vapor capacity: 52 grams at 25 degrees Celsius 13 grams at 10∘C52 grams at 30∘CFormula used to find the dew point:$$\dfrac{13}{52}=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$$$\frac{1}{4}=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$

Where A is the constantDew Point:It is the temperature at which air becomes saturated with water vapor when the temperature drops to a point where dew, frost or ice forms. To solve this question, substitute the given data into the formula.$$13/52=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$$$13(17.27-A)=3\pi A(ln100)$$By simplifying the above expression, we get$$A^2-17.27A+64.78=0$$Using the quadratic formula, we get$$A=9.9,7.4$$

The dew point is 7.4 since it is less than 10°C.More than 100:The term "More than 100" has not been used in the question provided.

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Answer:

a

Explanation:

To calculate the remaining amount of a cobalt-60 sample after 20 years, we can use the formula for radioactive decay:N = N₀ * (1/2)^(t / t(1/2)). Hence remaining amount of the cobalt-60 sample after 20 years is approximately 0.1891 times the initial amount

Given that the half-life of cobalt-60 is 5.27 years, we can substitute the values into the formula:

N = N₀ * (1/2)^(20 / 5.27)

Simplifying the equation:

N = N₀ * (1/2)^(3.7941)

Calculating the value inside the parentheses:

(1/2)^(3.7941) ≈ 0.1891

Now, multiplying the initial amount N₀ by the calculated value:

N = N₀ * 0.1891

Therefore, the remaining amount of the cobalt-60 radioactive isotope sample after 20 years is approximately 0.1891 times the initial amount. Please provide the unit symbol for the initial amount, and you can multiply it by the calculated value to obtain the unit symbol for the remaining amount.

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Complete question:

cobalt-60 is radioactive and has a half-life of 5.27 years. how much of a sample would be left after 20 years? round your answer to significant digits. also, be sure your answer has a unit symbol.

The percent yield of the experimentally produce 3.65 grams of copper when 1.87 grams of aluminium reacted with 9.65 grams of copper (ii) sulfate is 95.30%.

To calculate the percent yield, we first need to determine the theoretical yield of copper produced from the given amounts of aluminium and copper (II) sulfate. We'll use the balanced chemical equation to do this:

2 Al + 3 CuSO₄ → Al₂(SO₄)₃ + 3 Cu

First, find the moles of aluminium (Al) and copper (II) sulfate (CuSO₄) using their molar masses:

Al: 1.87 g / 26.98 g/mol = 0.0693 mol

CuSO₄: 9.65 g / 159.61 g/mol = 0.0605 mol

Determine the limiting reactant by dividing moles by the stoichiometric coefficients:

Al: 0.0693 mol / 2 = 0.03465

CuSO₄: 0.0605 mol / 3 = 0.02017

CuSO₄ is the limiting reactant as it has the lowest value.

Calculate the theoretical yield of copper (Cu) using the limiting reactant:

Theoretical yield of Cu: 0.02017 mol × 3 mol Cu / 1 mol CuSO₄ × 63.55 g/mol

= 3.83 g

Calculate the percent yield

Percent yield = (experimental yield / theoretical yield) × 100

Percent yield = (3.65 g / 3.83 g) × 100

= 95.30%

Thus, the percent yield of copper in this reaction is 95.30%.

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The air pressure of 112 psi in the inner tube of a racing bike tire is approximately 7.62 atm by using the conversion formula: 1 atm = 14.696 psi

To convert the pressure from psi (pounds per square inch) to atm (atmospheres), we can use the following conversion formula:
1 atm = 14.696 psi
To convert 112 psi to atm, we need to divide the given pressure (112 psi) by the conversion factor (14.696 psi/atm):
112 psi / 14.696 psi/atm = 7.62 atm (approximately)
So, the air pressure in the inner tube of a tire on a typical racing bike when held at a pressure of about 112 psi is approximately 7.62 atm. Therefore, the correct option is B) 7.62 atm.

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Answer:

Chemical reactions that absorb (or use) energy overall are called endothermic. In endothermic reactions, more energy is absorbed when the bonds in the reactants are broken than is released when new bonds are formed in the products.

Answer:

Liquids are separated by considerable distance. Because there is space, we may therefore conclude that compressing liquids is easy whereas compressing solids is difficult. Therefore, we can conclude that liquids are more compressible than solids.

Explanation:

To put it simply, compressibility refers to how much we can compress them. When discussing liquids, particles are packed closely together and there aren't enough empty spaces for them to be filled by applying forces. Since a solid's molecules are tightly packed together and exhibit strong intermolecular interaction, there is little room between them and they vibrate at their mean positions. Intermolecular attraction is weaker and molecules can move more freely in liquids. They are nevertheless extremely near to one another.

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Since there is little room for atoms in a solid and there's interatomic force, atoms move on their mean sites. Molecules can move more free in liquids due to lower covalent force. They remain quite near one another.

Because of molecules who make up any solid are packed densely together and move more slowly, an solid does indeed have a distinct structure and volume. Table salt, sugar, jewels, and a variety of minerals are examples of crystalline solids. Solids are frequently crystalline.

Atoms or molecules that are fixed tightly in place through bonds or other intermolecular interactions are said to be in the matter state known as solids. Many solids deal with difficult groupings of atoms called crystals that are fixed in place.

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If carbon dioxide levels drop too low, the person automatically breathes: a. Slower and less deeply.

When the carbon dioxide levels in the blood are low, the body responds by slowing down and decreasing the depth of breathing to retain more carbon dioxide, thereby maintaining a balanced state.

Hence, If carbon dioxide levels drop too low, the person automatically breathes slower and less deeply.

Your body's trillions of cells use the food molecules they metabolise to produce energy. Carbon dioxide (CO2) is a byproduct of this process. Exhaling allows your lungs to clear your body of extra CO2. However, a tiny amount is still present in your blood and is crucial for preserving the proper acid-base balance. Numerous illnesses, some relatively benign and others more serious, result in low blood CO2 levels.

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Answer:

Sodium hydroxide + ammonium chloride — Sodium chloride + ammonia gas + water

Explanation:

NaOH + NH4Cl — NaCl + NH3 + H2O

Answer:

D - Chemical energy transforms into thermal energy and radiant energy

Explanation:

Correct on edge 2020

Answer:

(D)

Explanation:

Chemical energy transforms into thermal energy and radiant energy.

Answer:

The answer is below

Explanation:

Avogadro stated that "Equal volumes of all gases at the same temperature and pressure contain the same number of molecules". Hence at standard temperature and pressure 1 mole of a gas occupies 22.4 liters of volume.

1 mol = 22.4 liters

Given a gas with 1 L and mass of 1.92 g at STP.

number of moles = 1 L / (22.4 L / mol) = 0.0446 mol

The molar mass = mass of gas / number of moles

molar mass = 1.92 g / 0.0446 mol

molar mass = 43.008 g / mol

Given:

Now,

Number of moles will be:

= \(\frac{1 \ L}{22.4 \ L/mol}\)

= \(0.446 \ mol\)

hence,

The molar mass,

= \(\frac{Mass \ of \ gas}{Number \ of \ moles}\)

By putting the values,

= \(\frac{1.92}{0.446}\)

= \(43.008 \ g/mol\)

Thus the answer above is correct.

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The work for the gas expansion from a sample of an ideal gas at 15.0 atm and 10.0 L that is allowed to expand against constant external pressure of 2.00 atm at a constant temperature is calculated as 13.2 kJ.

Boyle's law is an experimental gas law that describes relationship between pressure and volume of a confined gas.

Given, Initial pressure = 15.0 atm ; Initial volume = 10.0 L and Final external pressure = 2.00 atm

Using the equation for Boyle's Law ; P₁V₁ = P₂V₂

(15.0 atm × 10.0 L) = (2.00 atm × V₂)

V₂ = (15 * 10)/2

So, V₂ = 75.0 L

change in the volume, ΔV = V₂ - V₁

ΔV = 75.0 L - 10.0 L

So, ΔV = 65.0 L

As, W = -PΔV

P , external pressure = 2.00 atm

W = -(2.00 atm × 65.0 L)

So, W = -130 L. atm

W= -130 * (101.3/1)

W = 13169 J

Hence, W = 13.2 kJ

Therefore, work for the gas expansion is 13.2 kJ

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

Question : sample of an ideal gas at 15.0 atm and 10.0 l is allowed to expand against a constant external pressure of 2.00 atm at a constant temperature. calculate the work in units of kj for the gas expansion.

Answer:

Fluid friction describes the friction between layers of a viscous fluid that are moving relative to each other

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Please mark me as the brainliest

Thank you

Answer:

Option 3

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