What is the mole fraction, , of solute and the molality, (or ), for an aqueous solution that is 12.0% NaOH by mass?

Answer:

temperature and solubility

Explanation:

In the experiment where we are testing the solubility of sugar at different temperatures and pressure, the dependant variable is the solubility and the independent variables are the temperature, pressure and sugar concentration.

Independent variables in an experiment is the variables which does not depends on any other variables and on which we can have access or control.

Dependant variables are dependant on the independent variables and they change with respect to the change in independent variables.  On dependant variables are those which we are studying and can  have no direct control over it,

In the solubility measurement, solubility is the dependant variable and the we are measuring it under different conditions that are the independent variables such as temperature, pressure, sugar concentration etc.

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Answer:

A or C

Explanation:

Answer:

are made up of one or  more cells

Explanation:

A cell is the building block of life of any organism. Therefore, an organism simply cannot exist if it has no cells

Answer:

It is a Cline or layer where density gradient is greatest within a body of water

Explanation:

For the moment we have analyzed the physical point of view. For many, the most common way to analyze your body is through the chemical elements.

This increases the number of building blocks to more than four particles, but considering that the number of atoms in a 70 kilogram body is 7,000 quadrillion (you write a 7 followed by 27 zeros), it is still quite simple that we can count the 99.95% of your body weight with only seven elements.

The provocative alternative theories to the Big Bang that state that the universe has no limits

You may have heard that most of our body is water. It may seem unlikely given how solid our bodies feel, but most of you are made of cells filled with water.

There is enough structure that you are unlikely to slide down the drain, but you do have a lot of water. About 60 percent of your body is water, even your bones are roughly 30% water.

Two skeletons sitting on the beach.

IMAGE SOURCE, GETTY IMAGES

Caption,

The bones have 30% water in their composition.

Knowing that water is made up of hydrogen and oxygen (H2O), it seems clear to point out that the elements most present in the body are hydrogen and oxygen.

But there is also much of the most versatile of atoms, carbon. All life we know incorporates water and is based on carbon structures.

Since carbon atoms weigh 12 times more than hydrogen atoms, carbon ranks second by weight behind oxygen.

The thing would be like this: we have 65% oxygen, 18% carbon and 10.2% hydrogen.

If we add a small amount of nitrogen (3.1%), a pinch of calcium for those bones (1.6%), 1.2% of phosphorus, 0.25% of potassium and sulfur and smaller percentages of sodium, magnesium and chlorine, we already reached 99.95

Answer:

ionic bonds are the weakest bonds

Explanation:

Answer:

the earth would be covered in ice and we would not be able to survive as there is not natural insulation

Explanation:

Regeneration is a type of asexual reproduction in which the organism is capable of regrowing certain body parts.

Answer: Regeneration is defined as organism's ability to regrow damaged or lost body parts. It is a type of asexual reproduction which is shown by many fully differentiated organisms. Organism such as Hydra uses regenerative cells for reproduction in the process of budding. The young Hydra gets its nourishment from the parent.

Explanation:

Answer:

magnesium  

Explanation:

because zinc does not react with water because it too forms a protective layer of insoluble.

Answer:

5.5 atm

Explanation:

Step 1: Calculate the moles in 2.0 L of oxygen at STP

At STP, 1 mole of an ideal gas occupies 22.4 L.

2.0 L × 1 mol/22.4 L = 0.089 mol

Step 2: Calculate the moles in 8.0 L of nitrogen at STP

At STP, 1 mole of an ideal gas occupies 22.4 L.

8.0 L × 1 mol/22.4 L = 0.36 mol

Step 3: Calculate the total number of moles of the mixture

n = 0.089 mol + 0.36 mol = 0.45 mol

Step 4: Calculate the pressure exerted by the mixture

We will use the ideal gas equation.

P × V = n × R × T

P = n × R × T / V

P = 0.45 mol × (0.0821 atm.L/mol.K) × 298 K / 2.0 L = 5.5 atm

Answer:

The approximate age of the igneous rock is [tex]7.042\times 10^{6}[/tex] years.

Explanation:

Chemically speaking, the Uranium-235 decays to form Lead-207 throughout time. All isotopes decay exponentially by means of the following model:

[tex]m(t) = m_{o}\cdot e^{-\frac{t}{\tau} }[/tex] (1)

In addition, we can determine the time constant of the former isotope in terms of its half life, that is:

[tex]\tau = \frac{t_{1/2}}{\ln 2}[/tex] (2)

Where:

[tex]m_{o}[/tex] - Initial mass of Uranium-235, in atoms.

[tex]m(t)[/tex] - Current mass of Uranium-235, in atoms.

[tex]\tau[/tex] - TIme constant, in years.

[tex]t_{1/2}[/tex] - Half-life of Uranium-235, in years.

Please remind that a 1 : 1 ratio of Uranium-235 to Lead-207 atoms means that current mass of Uranium-235 is a half of its initial mass. If we know that [tex]m(t) = 0.5\cdot m_{o}[/tex] and [tex]t_{1/2} = 7.04\times 10^{8}\,yr[/tex], then the approximate age of the igneous rock is:

[tex]\tau = \frac{7.04\times 10^{8}\,yr}{\ln 2}[/tex]

[tex]\tau \approx 1.016\times 10^{9}\,yr[/tex]

[tex]t = -\tau \cdot \ln \left(\frac{m(t)}{m_{o}} \right)[/tex]

[tex]t = -(1.016\times 10^{9}\,yr)\cdot \ln \frac{1}{2}[/tex]

[tex]t \approx 7.042\times 10^{6}\,yr[/tex]

The approximate age of the igneous rock is [tex]7.042\times 10^{6}[/tex] years.

Explanation:

Three things are required in proper combination before ignition and combustion can take place---Heat, Oxygen and Fuel. There must be Fuel to burn. There must be Air to supply oxygen. There must be Heat (ignition temperature) to start and continue the combustion process.

A: ionic bond,   you know why becasue it is

Answer:

O High pressure/Low pressure

Explanation:

A low pressure system has lower pressure at its center than the areas around it. Winds blow towards the low pressure, and the air rises in the atmosphere where they meet. ... A high pressure system has higher pressure at its center than the areas around it. Winds blow away from high pressure.

The two types of pressure commonly referred to are high pressure and low pressure. Therefore option 3 is correct.

High pressure/Low pressure: This option correctly identifies the two main types of pressure. High pressure refers to conditions where the pressure is greater than atmospheric pressure, such as in compressed gases or in high-pressure systems.

Low pressure refers to conditions where the pressure is less than atmospheric pressure, such as in a vacuum or in areas of low atmospheric pressure, like the center of a weather system.

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Answer:

a. Hexanal

Reagent: - Hot acidified potassium permanganate solution.

or : Ammoniacal silver nitrate solution

or : Fehling's solution.

or : Hot acidified potassium dichromate ( VI ) solution.

Some organic compounds can be oxidised to carboxylic acid using suitable oxidising agents. Alkanes can be converted to acid or acid salt by carboxylation reaction and alkyl halides can be converted using Grignard reagent and then hydrolysis.

Carboxylic acids are organic acids containing the functional group COOH. It can be prepared through oxidation  of various of organic compounds.

Hexanal can be converted to hexanoic acid using carboxylation that is reaction with carbon dioxide.

Methyl hexanoate is an ester which can be converted to hexanoic acid by hydrolysis. Reaction with water introduces the H+ group into the ester group COOMe.

1 bromopentane can be converted into hexanoic acid using grignard reagent RMg followed by hydrolysis.

Alcohols can be easily oxidised to acids. Thus, 1-hexanol can be oxidised to hexanoic acid using oxidising agents such as potassium permanganate.

Nitriles can be oxidised to corresponding carboxylic acid using oxidising agents such as chromium chloride or grignard reagent.

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Answer:

A switch

Battery or cell

Resistor

Rheostat

Appliance or load such as bulb

connecting wires.

Jockey

Inductor

Capacitor

Meter bridge

Potentiometer

Voltimeter

Ammeter

Galvanometer

Answer:

C.A scientific approach to answering questions

Explanation:

Answer:

The equilibrium law

Explanation:

According to the equilibrium law , when [tex]$\text{concentration}$[/tex] of any of the  reactants or the products in the reaction at an equilibrium state,  is changed, then it changes the composition of equilibrium mixture in order to minimize the effect of

Acetic acid (in excess) + [tex]$\text{alcohol}$[/tex] ⇄  [tex]$\text{ester}$[/tex] + water

[tex]$\text{Fischer esterification}$[/tex] is a reaction which involves the equilibrium. So to force the reaction towards the side of [tex]$\text{ester}$[/tex], one of the reactant is taken in excess. All this can be explained easily by applying the equilibrium law.

Answer:

One of the most important uses for fingerprints is to help investigators link one crime scene to another involving the same person. Fingerprint identification also helps investigators to track a criminal's record, their previous arrests and convictions, to aid in sentencing, probation, parole and pardoning decisions.

Explanation:

Answer:

[tex]\boxed {\boxed {\sf 1076.196 \ Joules}}[/tex]

Explanation:

Since we are given the mass, specific heat, and temperature, we should use the following formula for heat energy.

[tex]q=mc\Delta T[/tex]

The mass of the aluminum is 26.3 grams. Its specific heat is 0.930 Joules per gram degree Celsius. We need to find the change in temperature.

Now we know all the values.

Substitute the values into the formula.

[tex]q= (26.3 \ g}) \times (0.930 \ J/g \textdegree C) \times (44 \textdegree C)[/tex]

Multiply the first two numbers together. The units of grams cancel.

[tex]q= 24.459 \ J/ \textdegree C \times 44 \textdegree C[/tex]

Multiply again. This time, the units of degrees Celsius cancel.

[tex]q=1076.196 \ J[/tex]

1076.196 Joules of heat will be absorbed by the piece of aluminum.

The partial pressure of each gas is the product of its mole fraction and total pressure. The partial pressure of carbon dioxide is 2.46 atm and the partial pressure of water vapor is 0.034.

Dalton's law of partial pressure states that the partial pressure of the component gases in a mixture is the product of its mole fraction and the total pressure.

Given that, number of moles of carbon dioxide = 0.197 moles.

number of moles of water vapor =0.00278 mole.

mole fraction of carbon dioxide = 0.197 / (0.197 + 0.00278) = 0.98

Total pressure = 2.50 atm

then partial pressure of carbon dioxide = 0.98 × 2.50 = 2.46 atm

Mole fraction of water vapor =  0.00278 / (0.197 + 0.00278) = 0.0139

partial pressure of water vapor = 0.0139 × 2.50 = 0.034 atm.

Therefore, the partial pressure of carbon dioxide and water vapor are 2.46 and 0.034 atm respectively.

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Answer:

Alkene

Explanation:

Took the test.

The correct answer is Option (A) Alkene.

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Answer:

222 g

Explanation:

First we convert 500.0 mL to L:

Then we use the definition of molarity to calculate how many calcium chloride moles are required:

Now we convert 2.00 moles of calcium chloride into grams, using its molar mass:

Answer:

The first one

Explanation:

Both the products and reactants in the first equation have the same number of moles and will not be affected by a change in volume.

Answer: The given elements are arranged in order of increasing ionization energy as Pb < Sn < Ge < Si < C.

Explanation:

The amount of energy required to remove a loosely bound electron from an isolated neutral gaseous atom is called ionization energy.

Larger is the size of an atom more easily it will lose its valence electrons. Hence, less will its ionization energy.

Whereas smaller is the size of an atom more energy will be required to pull out the electron. Hence, more will be its ionization energy.

This means that on moving down a group ionization energy decreases and on moving along a period from left to right the ionization energy decreases.

The given elements are C, Ge, Pb, Si, and Sn. All these elements belong to group 14 of the periodic table.

Therefore, these elements are arranged in order of increasing ionization energy as follows.

Pb < Sn < Ge < Si < C

Thus, we can conclude that given elements are arranged in order of increasing ionization energy as Pb < Sn < Ge < Si < C.

Answer:

D). Taxonomy.

Explanation:

'Taxonomy' is described as the process or the science of finding, describing, classifying, and naming different organisms. It is characterized as the technique of classification of animals, micro-organisms, plants, etc. into different categories or hierarchies. It has primarily been divided into eight distinct types like kingdom, species, order, family, etc.  

Astronomy is associated with the study of the physical universe while the economy is defined as the study of efficient utilization of resources and identification is the process of recognizing an object. Thus, option D is the correct answer.

Answer:

Purify drinking water of unwanted

Hope this helps! :D