can u answer this?
Mass: 126 g
Volume: 15 cm to the third power
Density:?

Answer:

133.3atm

Explanation:

Given parameters:

Initial volume  = 400ft³

Final volume  = 3ft³

Initial pressure = 1atm

Unknown:

Final pressure  = ?

Solution:

To solve this problem, we  apply Boyle's law which states that "the volume of a fixed mass of a gas varies inversely as the pressure changes if the temperature is constant".

  Mathematically;

               P₁V₁ = P₂V₂

P and V are pressure and volume

1 and 2 are initial and final states;

   Insert parameters and solve;

                1 x 400  = P₂ x 3

                     P₂  = 133.3atm

Answer:

Explanation:

It is density.

I do hope I helped you! :)

Answer:

Explanation:

Groundwater spread over the years

Ion exchange is more likely to be the decision if they wanted something that costs less because reverse osmosis systems are more expensive because they require filters that need to be replaced.

Reverse osmosis desalination involves taking seawater and first treating it to get rid of contaminants like oil, seaweed, trash, and other things. Reverse osmosis can be used to purify seawater after it has been cleared of organic matter. We have two streams after filtering: one is brine and the other is freshwater.

Another approach was developed and is currently utilised in the food industry, utilising the principles of osmosis and osmotic pressure.

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Reverse osmosis systems are more costly because they need filters that need to be changed, so if they wanted something cheaper, they were more apt to choose ion exchange.

Reverse osmosis desalination starts by purifying saltwater to remove impurities like oil, seaweed, debris, and other materials. After being freed of organic debris, saltwater can be purified using reverse osmosis. After filtration, we have two streams: one is freshwater and the other is salt.

A different strategy was created and is presently used in the food business. It makes use of the osmosis and osmotic pressure principles.

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Answer:

The correct answer is (b) About 13 grams

Explanation:

The solubility of NH4Cl N H 4 C l at 70 degrees Celsius is 62 g of solute per 100 g of water.

The solubility of ammonium chloride at 70 degrees Celsius is 62 g of solute per 100 g of water.

Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.

The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.Concept of solubility is not valid for chemical reactions which are irreversible. The dependency of solubility on various factors is due to interactions between the particles, molecule or ions.

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Answer:

Evaporation

Explanation:

Evaporation is the process by which water changes from the liquid state to the gaseous state.

Unlike boiling that only occurs at a specific temperature (boiling point), evaporation occurs at any temperature. This explains why water disappear when placed under direct sunlight or under a shade.

The incompressible assumption is valid for a flow when the Reynolds number is low (Re < 2300) for air and other gases. It is valid for water and other liquids when the Reynolds number is low (Re < 2000).

It is valid for glycerin and other oils when the Reynolds number is low (Re < 100).

Incompressible assumption

For a fluid flow to be considered incompressible, the change in density due to changes in pressure or temperature must be negligible. The fluid is considered to be incompressible if the density changes by less than 5% when the pressure or temperature is varied.

For air, the incompressible assumption is valid for flow velocities less than 2000 feet per minute (fpm) at 20 degrees Celsius. For other gases, the incompressible assumption is valid for velocities less than 100 fpm at the same temperature.

For water, the incompressible assumption is valid for flow velocities less than 3 feet per second (fps) at 20 degrees Celsius. For other liquids, the incompressible assumption is valid for velocities less than 1 fps at the same temperature.

For glycerin and other oils, the incompressible assumption is valid for flow velocities less than 0.2 fps at 20 degrees Celsius.

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Answer:

One triple bond and four non bonding electrons

Explanation:

In considering the lewis structure of carbon monoxide, we must remember that the molecule contains a total of ten valence electrons. Four are the valence electrons that are present on the valence shell of carbon while six are the valence electrons on oxygen. Some of these valence electrons participate in bonding in the CO molecule.

Out of the six valence electrons on oxygen, two valence electrons participate in bonding with carbon while the other four electrons remain localized on the oxygen atom as two lone pairs of electrons.

Hence there are four nonbonding electrons in the lewis structure of CO as well as one triple bond.

Answer:the plants received more sunlight

Explanation:

Answer:

Pluto is farthest from the sun and hence it receives extremely low energy of sun. The surface temperature of Pluto is about -240 !!!

The density of the substance having a mass of 2.0 g is 0.4 g/mL (Option D)

First, we shall obtain the volume of the substance. This can be obtained as follow:

Volume of substance = (Volume of water + substance) - (Volume of water)

Volume of substance = 75 - 70

Volume of substance = 5 mL

Finally, we shall determine the density of the substance. This is illustrated below:

Density = mass / volume

Density of substance = 2 / 5

Density of substance = 0.4 g/mL

Thus, the density is 0.4 g/mL (Option D)

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To determine if ethylene glycol n-butyl ether-water is one or two-phase system, we need to compare the tie-line length and the lever rule calculation. A single stable liquid phase with a mass fraction of 30% ethylene glycol n-butyl ether and 70% water is present at equilibrium.

Assuming that the system follows Raoult's law and that the activity coefficients are equal to one, we can use the following equation to calculate the tie-line length:

Tie-line length = (x2 - x1) / (y1 - x1)

where x1 and x2 are the mole fractions of water in the liquid phase and vapor phase, respectively, at the two-phase boundary, and y1 is the mole fraction of water in the liquid phase at the point where the tie-line intersects the tie-line axis.

Using the given data, we can calculate the mole fraction of water in the liquid phase at the two-phase boundary as follows:

x1 = 0.3 (given)

x2 = 1 - x1 = 0.7

y1 = x1 = 0.3 (assuming the vapor phase is pure water)

Substituting these values into the tie-line equation, we get:

Tie-line length = (0.7 - 0.3) / (0.3 - 0.3) = 0

Since the tie-line length is zero, the system is a single-phase liquid, and there is no two-phase region. Therefore, the answer is that the system is one stable liquid phase at equilibrium, with a mass fraction of water of 70% and a mass fraction of ethylene glycol n-butyl ether of 30%.

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The thermometer didn't say anything to the graduated cylinder because thermometers and graduated cylinders are inanimate objects and cannot speak or communicate with each other. A thermometer is an instrument used for measuring temperature.

It is a sealed glass tube containing a liquid (usually mercury) that expands and contracts as the temperature changes. A graduated cylinder is a cylindrical container used to measure the volume of liquids. It is made of glass or plastic and has markings along its side indicating different volume measurements.

The increase in temperature can lead to a range of problems that can negatively impact the ecosystem, humans, and animals, leading to several problems. Hence, it is essential to control the concentration of greenhouse gases.

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The theoretical yield of iron metal : 16.418 g

A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.

Reaction

2 Fe₂O₃ + 3 C ⇒ 4 Fe + 3 CO₂

mol Fe₂O₃ (MW=159,69 g/mol) :

\(\tt \dfrac{23.5}{159.69}=0.147\)

mol  Fe₂O₃ : mol Fe = 2 : 4

mol Fe :

\(\tt \dfrac{4}{2}\times 0.147=0.294\)

mass Fe(the theoretical yield) :

\(\tt 0.294\times 55.845~g/mol=16.418~g\)

Answer:

The correct answer with signfigs is 16.4 for the first part

The second box is 88.4

Explanation:

The answer is 67 108.0888km/s.

The answer in correct number of significant figures should be reported as 4.6.

When performing calculations, it is important to consider significant figures to maintain the appropriate level of precision in the result. In this case, the division operation introduces additional uncertainty.

Starting with the given numbers:

249.362 (6 significant figures)

41 (2 significant figures)

63.498 (5 significant figures)

Performing the calculation:

249.362 + 41 / 63.498 = 249.362 + 0.646703 = 249.362 + 0.6 (rounded to one decimal place)

The addition requires consistent decimal places, so the result is rounded to the nearest tenth, which is 0.6. Adding this to the whole number:

249.362 + 0.6 = 249.962

To report the final answer with the correct number of significant figures, we round to the nearest tenth:

249.962 ≈ 250.0

When expressed with one decimal place, the result is 4.6.

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The molecular formula of a compound with the empirical formula ch and a formula mass of 78.114 amu is C6H6

The empirical formula is the simplest whole number ration that defines constituent atoms in a species. The molecular formula is always a multiple of the empirical formula.

The simplest whole number ratio of atoms in a compound is the empirical formula of a chemical compound in chemistry. Sulfur monoxide's empirical formula, SO, and disulfur dioxide's empirical formula, S2O2, are two straightforward examples of this idea.

As a result, both the sulfur and oxygen compounds sulfur monoxide and disulfur dioxide have the same empirical formula. They do not, however, have the same molecular formulae, which specify how many atoms are present in each molecule of a chemical compound.

The configuration or quantity of atoms are not mentioned in an empirical formula. It is typical for many macromolecules, such as silicon

Given the above:

molecular formula = n×(empirical formula)

Thus ,

molecular formula = 78.0g mol−1 = n

(12.011+1.00794) gmol−1

n = 78 /12.011 +1.00794 = 6

And

molecular formula = C6H6

Sometimes (but not here!)

molecular formula ≡ empirical formula , i.e. the multiple

n = 1

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Answer:

Explanation:

Metals in the top of the reactivity level i.e. metals like sodium, magnesium, calcium, etc cannot be obtained from their compound by heating with carbon as they are very reactive. Electrolytic reduction is used to obtain such metals.

The balanced equation for the given reaction is:

CaF2(s) → Ca(s) + F2(g)

This equation indicates that one molecule of calcium fluoride (CaF2) decomposes into one molecule of calcium (Ca) and one molecule of fluorine gas (F2). The equation is balanced because the number of atoms of each element is equal on both sides of the equation.

The p-value of the test is 0.685 is greater than the significant level of α (α > 0.685).So, we do not reject the null hypothesis, the p-value of this test is 0.178.

The p-value of the test is 0.178.Explanation: Given data are:0.45, 0.62, 0.71, 0.84, 0.86, 0.88, and 0.96.Assume that the fluoride levels of the drinking water of 7 randomly selected households follow the normal distribution with mean µ and standard deviation σ.

So, the null hypothesis is H0: µ = 0.8 vs. alternative hypothesis H1: µ ≠ 0.8. Given significance level (α) is not given.So, we need to find the p-value of this test.Using the given data, the mean is given by:¯x = (0.45 + 0.62 + 0.71 + 0.84 + 0.86 + 0.88 + 0.96)/7 = 0.764and the sample standard deviation is given by:s = √(Σ(xi - ¯x)²/(n - 1))= √[((0.45 - 0.764)² + (0.62 - 0.764)² + (0.71 - 0.764)² + (0.84 - 0.764)² + (0.86 - 0.764)² + (0.88 - 0.764)² + (0.96 - 0.764)²)/6]= 0.196.Now, the test statistic value is given by:z = (¯x - µ)/(s/√n) = (0.764 - 0.8)/(0.196/√7) = -0.483And, p-value of this test is given by:P(z > -0.483) = 1 - P(z < -0.483) = 1 - 0.3155 = 0.6845 ~ 0.685.The p-value of the test is 0.685 is greater than the significant level of α (α > 0.685).So, we do not reject the null hypothesis.

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The option C. Blood pressure is not a benefit of having the proper amount of fatty acids in your body.

The body stores and uses fats into various forms. They are present in cell membrane providing selective permeability to the cell. They are also used by body to make different sexual hormones responsible for sexual characteristics.

The lipid are also attached on protein or carbohydrates that act as marked for cell recognition. They are also important for blood coagulation and are present in outermost skin layer thus imparting integrity.

The blood pressure however refers to to pressure in the wall of blood vessels during blood flow.

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Answer:

C. they are both polymers

Explanation:

They are a polymer made up of monomers called monosaccharides.

These building blocks are simple sugars, e.g., glucose and fructose. Two monosaccharides connected together makes a disaccharide

The chemical species that is missing from the net ionic equation is the number of electrons.

We know that what we have in this case is a redox reaction. When we talk about a redox reaction we are talking about the kind of reaction where reduction and oxidation are both taking place at the same time. This implies that one of the species would accept the electrons and one of the species would donate the electrons.

Having said this, if we look at the reaction equation as it has been written, we can see that the specie that is missing here is the number of electrons that have been lost or gained in the course of the reaction as it has been written here.

We can only be able to infer this from the charges that the species that we can see in the reaction equation are carrying.

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Answer:

6. Color Change.

Production of an odor.

Change of Temperature.

Explanation:

That is the only one I know :)

Answer:

6. 3 things could potentially be, a change in mass, a change in color, or a change in weight. obviously there are more, but these are 3.

I'm sorry I couldn't answer more of these question of yours, I don;t know too much about aluminium :/

May I have brainliest please? :)

The azide ion, Nsubscript3 superscript1-, is a symmetrical ion

Five valence electrons make up nitrogen.

The ion has a total of 16 valence electrons (5 * 3 + 1), making it symmetrical.

We will use all 16 of the valence electrons if we give three pairs of electrons to the two terminal N atoms to complete their octets. However, there are only 4 shared valence electrons on the core nitrogen atom.

1. N atoms can have two double bonds placed between them.

2. The central N atom can create a single bond and a triple bond with the right and left N atoms, respectively.

3. The central N atom has the ability to create single and triple bonds with the left and right N atoms, respectively.

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Answer:

6.25m/s

Explanation:

speed = distance/time

speed = 100/16 = 6.25m/s

The attraction between the nucleus and electrons decreases tends to occur in groups that results in an increase in atomic radius.

Magnesium atoms have atomic radii that are lower than those of sodium atoms. The magnesium atom's smaller radius is mainly due to the fact that it has two more electrons in its outermost energy level than the sodium atom does.The attractive interactions between the nucleus and the additional electrons in the magnesium atom make them weaker, which leads to a reduced atomic radius. An element's atomic radius serves as a gauge for the size of its atoms.

The atomic radius of atoms increases in groups of elements on the Periodic Table of the Elements. Which best describes what tends to occur in groups that results in an increase in atomic radius?

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Answer:

a

Explanation:

Answer: A and B

Explanation: A and b are Sodium chloride and Hydrogen chloride which are both compounds.

Answer: A. NaCI

Explanation: APEX