Answer fast please What system are your lungs part of
A. Circulatory
B, Respiratory
C. Digestive
D. Skeletal

Answer:

The control variable in a comparison of cleaning teeth with baking soda and toothpaste would be the toothbrush used, as it is the constant factor in both conditions. The toothbrush should remain the same in both experiments to ensure that any observed differences in cleaning effectiveness are due to the baking soda or toothpaste and not the toothbrush.

Answer:

Nitrogen group element, any of the chemical elements that constitute Group 15 (Va) of the periodic table. The group consists of nitrogen (N), phosphorus (P), arsenic (As), antimony (Sb), bismuth (Bi), and moscovium (Mc)

Explanation:

If excess ammonium sulfate reacts with 20.0g of calcium hydroxide then liters of ammonia are produced at STP 0.081L

Ammonium sulphate is the organic solvent and the primary use of ammonium sulphate is as a fertilizer for alkaline soils

Here given reaction is

(NH₄)₂SO₄ + Ca(OH)₂ → CaSO₄ + NH₃ + H₂O

Here given data is

Calcium hydroxide  = 20.0g

We have to find liters of ammonia are produced at STP =?

20.0g of (NH₄)₂SO₄ STP = ?

Then 20.0g of (NH₄)₂SO₄×1 mol/132g×0.54L/1 mol = 0.081L

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Answer:

A. iron

Explanation:

I got a 100

The answer is A.

I know this information because I just took the unit test review on Edg.

Answer:

Sodium (Na) is a cation, which means it has a positive charge.

Sodium forms ionic compounds with different anions, such as sulfate (SO4 2-) and chloride (Cl-).

In sodium sulfate (Na2SO4), sodium is still a cation with a charge of +1, while sulfate is an anion with a charge of -2.

In sodium chloride (NaCl), sodium is still a cation with a charge of +1, while chloride is an anion with a charge of -1.

Therefore, the cation that remained the same between sodium sulfate and sodium chloride is sodium (Na+).

Explanation:

Sodium (Na) is a cation, which means it has a positive charge.

Sodium forms ionic compounds with different anions, such as sulfate (SO4 2-) and chloride (Cl-).

In sodium sulfate (Na2SO4), sodium is still a cation with a charge of +1, while sulfate is an anion with a charge of -2.

In sodium chloride (NaCl), sodium is still a cation with a charge of +1, while chloride is an anion with a charge of -1.

Therefore, the cation that remained the same between sodium sulfate and sodium chloride is sodium (Na+). In chemistry, there are two types of ions: cations and anions.

Cations are ions that have a positive charge because they have lost one or more electrons. Anions are ions that have a negative charge because they have gained one or more electrons.

Sodium (Na) is a cation with a charge of +1, meaning it has lost one electron. In both sodium sulfate (Na2SO4) and sodium chloride (NaCl), sodium is still a cation with a charge of +1.

Therefore, the cation that remained the same between sodium sulfate and sodium chloride is sodium (Na+).

The cation (Na⁺) stayed the same in both cases, whereas the anions (SO₄²⁻ and Cl⁻) differed. The cation (Na+) remained the same in both cases, whereas the anions (SO₄²⁻ and Cl⁻) differed.

The ion that remained the same between sodium sulfate and sodium chloride is cation. An ion is an atom that has lost or gained one or more electrons. A positive ion is known as a cation since it has lost one or more electrons, whereas a negative ion is known as an anion since it has gained one or more electrons. The ions are crucial for the chemical reactions to occur and salt formation.

In sodium sulfate (Na2SO4), the sodium (Na) atom gives away two electrons to create Na+. In this example, the Na+ ion is formed, which is a cation. In sodium chloride (NaCl), the sodium (Na) atom gives away one electron to create Na+. In this example, the Na+ ion is also formed, which is a cation.

The cation (Na+) stayed the same in both cases, whereas the anions (SO₄²⁻  and Cl⁻) differed. As a result, the cation (Na+) remained the same in both cases, whereas the anions (SO₄²⁻  and Cl⁻) differed.

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Answer: white blood cells

Explanation: they protect you from illnesses and diseases

Answer: Your answer is J

Explanation: This can occur when moon is closest to earth.

So the moon in between earth and sun.

Also factually the moon can effect human behavior, because humans are made up of some percent of water.

Dry ice in an ice-cream cart disappears  on sublimation .

In general , because of the process of absorption of heat , dry ice when present in the solid state is directly transformed directly into a gas without being converted into a liquid state and thus disappears. Dry ice get physical transformation by the process of sublimation that is from solid to the gaseous state without melting into a liquid.

Hence , we  can say that sublimation is a process that is used to explain  about the process of snow and ice changing into water vapor (gas) in the air without melting into water. Dry ice is generally present in solid state, that get to sublimate, or turn to gas, at a chilly -78.5 °C.

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Answer:

Find ratio of atoms for empirical formula, divide mass by atomic mass

C=42.87/12 = 3.57

H= 3.598/1 = 3.598

O= 28.55/16 = 1.784

N= 25.00/14 =1.1785

to see ratio, divide by smallest no

Gives C2H2ON for empirical formula

Empirical mass = 24 +2 +16 + 14 = 56

165 to 170 /56 = 3

so molecular formula = empirical formula x 3= C6H6O3N3

1. The empirical formula of the compound is C₂H₂ON

2. The molecular formula of the compound is C₆H₆O₃N₃

From the question given above, the following data were obtained:

Carbon (C) = 42.87%

Hydrogen (H) = 3.598%

Oxygen (O) = 28.55%

Nitrogen (N) = 25.00%

C = 42.87%

H = 3.598%

O = 28.55%

N = 25.00%

Divide by their molar mass

C = 42.87 / 12 = 3.5725

H = 3.598 / 1 = 3.598

O = 28.55 / 16 = 1.7844

N = 25.00 / 14 = 1.7857

Divide by the smallest

C = 3.5725 / 1.7844 = 2

H = 3.598 / 1.7844 = 2

O = 1.7844 / 1.7844 = 1

N = 1.7857 / 1.7844 = 1

Therefore, the empirical formula of the compound is C₂H₂ON

Molar mass of compound = (165 + 170)/2

Molar mass of compound = 335/2

Molar mass of compound = 167.5 g/mol

Empirical formula = C₂H₂ON

Molecular formula = Empirical formula × n = molar mass of compound

[C₂H₂ON]n = 167.5

[(12×2) + (2×1) + 16 + 14]n = 167.5

[24 + 2 + 16 + 14]n = 167.5

56n = 167.5

Divide both side by 56

n = 167.5 / 56

n = 3

Molecular formula = [C₂H₂ON]n

Molecular formula = [C₂H₂ON]₃

Therefore, the Molecular formula of the compound is C₆H₆O₃N₃

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Scientific theories are always testable. A theory may be changed as a result of new observations.

Scientific theories can be changed or replaced when new information disproving the current theory becomes available.

All scientific theories are based on observable, testable evidence and when new information is discovered that disagrees with the current theory the theory can be modified (or discarded).

A scientific theory is a well-substantiated explanation of some aspect of the natural world, based on a body of facts that have been repeatedly confirmed through observation and experiment.

Such fact-supported theories are not "guesses" but reliable accounts of the real world.

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Answer:

To determine the limiting reactant and the excess reactant, we need to compare the stoichiometry of the reaction with the amounts of each reactant given.

The balanced chemical equation is:

3 MgCl2 + 2 Na3PO4 -> 6 NaCl + Mg3(PO4)2

Given:

Moles of MgCl2 = 0.75 mol

Moles of Na3PO4 = 0.65 mol

a) To verify the limiting reactant, we need to calculate the moles of Na3PO4 and MgCl2 needed to react completely, based on the stoichiometry of the balanced equation.

From the equation, we can see that:

For every 3 moles of MgCl2, 2 moles of Na3PO4 are required.

Therefore, the moles of Na3PO4 required to react with 0.75 mol of MgCl2 would be:

(0.75 mol MgCl2) x (2 mol Na3PO4 / 3 mol MgCl2) = 0.5 mol Na3PO4

Since we have 0.65 mol of Na3PO4, which is greater than the required amount of 0.5 mol, Na3PO4 is the excess reactant.

b) To find the moles of the excess reactant left over, we subtract the moles of Na3PO4 that reacted from the initial moles:

0.65 mol Na3PO4 - 0.5 mol Na3PO4 = 0.15 mol Na3PO4 (left over)

c) To determine the moles of NaCl produced in the reaction, we need to calculate the moles of the limiting reactant (MgCl2) that reacted. From the balanced equation, we know that:

For every 3 moles of MgCl2, 6 moles of NaCl are produced.

Using the stoichiometry, we can calculate the moles of NaCl produced:

(0.75 mol MgCl2) x (6 mol NaCl / 3 mol MgCl2) = 1.5 mol NaCl

Therefore, 1.5 mol of NaCl will be produced in this reaction.

Answer:

false Elevation cannot be described as elevation, relief, and landforms

Dalton's Atomic theory was Atom is an indivisible fundamental particle but Bohrs theory contradict it,

Atoms contain smaller particles: protons, neutrons, and electrons.

The sludge generation process refers to the production of sewage treatment residue during wastewater treatment. Sludge contains solid and semi-solid materials that must be handled and disposed of properly to protect human health and the environment.

The following are some methods for sewage disposal:

Wastewater Treatment: Initial treatment involves the physical removal of large solids, whereas secondary treatment uses biological processes to break down organic matter and remove dissolved pollutants.

Sludge Treatment: The separated sludge is under further treatment, which may include stabilization, dewatering, and, in some cases, additional processes to reduce contaminants.

Land Application: Treated sludge can be applied to agricultural land as a fertilizer or soil conditioner if it meets regulatory guidelines and has been properly treated.

Landfills: If sludge cannot be reused or recycled, it can be disposed of in a designated landfill that meets regulatory requirements, ensuring proper containment and preventing soil and water contamination.

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Answer:

erosion is the right answer

Explanation:

Acidic radical

Acid radical is the ion formed after the removal of Hydrogen ion (H+) from an acid. Example: When H2SO4 loses H+ ion, it forms HSO4− which is an acid radical.

Basic radical

The ion formed after the removal of hydroxide ion (OH−) from a base is known as basic radical.

2 liters of 72 octane gasoline should be mixed with (12 - 2) = 10 liters of 84 octane gasoline to obtain 12 liters of 82 octane gasoline.

Let's assume x liters of 72 octane gasoline are mixed with (12 - x) liters of 84 octane gasoline to obtain 12 liters of 82 octane gasoline.

To find the solution, we can set up an equation based on the octane content: (72x + 84(12 - x)) / 12 = 82

Now, let's solve for x:

72x + 84(12 - x) = 82 * 12

72x + 1008 - 84x = 984

-12x = 984 - 1008

-12x = -24

x = (-24) / (-12)

x = 2

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To solve this problem, we'll use the Beer-Lambert Law and the information given.

(a) According to the Beer-Lambert Law, the absorbance (A) is directly proportional to the concentration (c) of the absorbing species:

A = εlc

where A is the absorbance, ε is the molar absorptivity constant, l is the path length (in cm), and c is the concentration (in M).

Given:

Slope of the Beer's Law plot (εl) = 3.5 × \(10^3\)

Absorbance (A) = 0.700

Since we have a 1 cm path length, the slope (εl) is equal to the molar absorptivity constant (ε).

Substituting the values into the equation, we can calculate the equilibrium concentrations:

ε = \(3.5*10^3 M^{(-1)} cm^{(-1)}\)

A = 0.700

Using the Beer-Lambert Law equation, we can rearrange it to solve for the concentration (c):

c = A / (εl)

For Fe3+:

c(Fe3+) = A / (εl) = 0.700 / (3.5 × \(10^3\)) = 2 ×\(10^{(-4)}\) M

For SCN-:

c(SCN-) = A / (εl) = 0.700 / (3.5 × \(10^3\)) = 2 × 1\(0^{(-4)}\) M

For FeSCN2+:

Since FeSCN2+ is the product of the reaction between Fe3+ and SCN-, the concentration of FeSCN2+ at equilibrium will be zero until the reaction reaches equilibrium.

Therefore, the equilibrium concentrations are:

[Fe3+] = 2 × \(10^{(-4)}\) M

[SCN-] = 2 × \(10^{(-4)}\) M

[FeSCN2+] = 0 M

(b) To calculate the equilibrium constant (Keq), we'll use the equation:

Keq = ([FeSCN2+]) / ([Fe3+][SCN-])

Substituting the given values:

Keq = (0) / (\((2 * 10^{(-4)})^2\)) = 0

Therefore, Keq is equal to 0.

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Answer:

3) it cites valid data.

Explanation:

The presence of the ions in the HCl would make the solution to conduct electricity.

Because it separates into ions (H+ and Cl-) when hydrochloric acid is dissolved in water, HCl (hydrochloric acid) solution conducts electricity. The electric charge of the H+ and Cl- ions allows them to travel and convey current across the solution.

The dissociation constant (Ka) of HCl describes how much of the compound separates into ions depending on the concentration of the solution. A higher HCl concentration will produce more ions, which will increase conductivity.

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Answer:

A mixture is when two substances are physically combined and can be taken apart.

Explanation:

my words

…for his invention of the Wilson cloud chamber, which became widely used in the study of radioactivity, X rays, cosmic rays, and other nuclear phenomena.

Asnwer: average atomic mass of chromium is 52amu

Calculations:

49.946amu: 4.350%= 0.0435

51.941amu: 83.790%= 0.8379

52.941amu: 9.500%= 0.095

53.939amu: 2.360%= 0.0236

Average atomic mass of chromium = 0.0435(49.946) + 0.8379(51.941) + 0.095(52.941) + 0.0236(53.939)

= 51.9963703amu

= 52 amu

Answer:

The decreasing in concentration occurs after 69.0s

Explanation:

A first order reaction follows the equation:

Ln [A] = -kt + ln[A]₀

Where [A] is the concentration of the reactant after time t

k is rate constant of the reaction

And [A]₀ is the initial concentration of the reactant

Replacing:

Ln 2.45x10⁻²M = -1.80x10⁻²s⁻¹*t + ln8.48x10⁻²

-3.709 = -1.80x10⁻²s⁻¹*t -2.467

-1.2416 = -1.80x10⁻²s⁻¹*t

69.0s = t

The decreasing in concentration occurs after 69.0s

Answer:

It equals 826

Explanation:

Cos that's ur moms weight in pounds

The number of half lives will be 3 if the initial mass is 20 g and the remaining mass is 2.5 g.

Half-life, in the  radioactivity, is the amount of time needed for half of a radioactive sample's atomic nuclei to decay the (change spontaneously into other nuclear species by emitting the particles and energy), or, alternatively,  amount of the time needed for a radioactive material's rate of disintegrations per second to decrease by the half.

mi = mr × 2ⁿ

mi= initial mass

mr= remaining mass after n periods

n = number of periods

2ⁿ= mi/ mr

2ⁿ=

20/ 2.5

2ⁿ= 8

n= 3

Thus the number of half lives will be 3.

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1) List the known quantities.

Sample:

Elements:

Silver: Ag.

Nitrogen: N.

Oxygen: three O.

The compound above has silver, nitrogen, and oxygen.

silver, nitrogen, oxygen.

Answer:

6. physical

Explanation:

Answer:

D. S (Sulphur)

Explanation:

you couldve just looked this up lol