what is the freezing point of a solution formed by dissolving 0.75 moles naphthalene in 2.0 kg benzene g

Answer:

Explanation:

Calcium chloride (CaCl2) dissociates into three ions in water: one Ca2+ ion and two Cl- ions.

To find the concentration of ions in the solution, we need to find the total number of moles of ions that result from dissolving 0.584 moles of CaCl2:

One mole of CaCl2 produces one mole of Ca2+ ions and two moles of Cl- ions.

Therefore, 0.584 moles of CaCl2 produces 0.584 moles of Ca2+ ions and 2 x 0.584 = 1.168 moles of Cl- ions.

Next, we need to find the total volume of the solution:

The solution is made by dissolving the CaCl2 in enough water to make 4.76 L of solution.

Therefore, the volume of the solution is 4.76 L.

Finally, we can calculate the concentration of each ion:

Concentration of Ca2+ ions: moles of Ca2+ ions / volume of solution = 0.584 mol / 4.76 L = 0.122 M

Concentration of Cl- ions: moles of Cl- ions / volume of solution = 1.168 mol / 4.76 L = 0.245 M

So the concentration of Ca2+ ions is 0.122 M and the concentration of Cl- ions is 0.245 M.

The concentration (in m) of ions, in a solution of 0.584 moles of CaCl2 dissolved in enough water to make 4.76 L of the solution is 0.245 M.

What is concentration?

Concentration refers to the amount of a substance that is dissolved in a specific quantity of solvent or solution. It is typically measured in units of moles per liter (M) or milligrams per deciliter (mg/dL).

What is CaCl2?

Calcium chloride (CaCl2) is a compound of calcium and chlorine. It is a salt that is commonly used as a drying agent, because it can absorb water from the air. It is also used in food preservation, snow and ice removal, and concrete mixing.

How to find the concentration of CaCl2 ions?

The molar mass of CaCl2 is 111 g/mol.

Number of moles of CaCl2 = mass/molar mass= 0.584 moles

Volume of the solution = 4.76 L.

The concentration of CaCl2 ions can be calculated as follows:

Concentration of CaCl2 = Number of moles of CaCl2/Volume of the solution= 0.584 moles/4.76 L= 0.1227 M

The concentration of ions, on the other hand, is calculated as twice the concentration of CaCl2 because the compound dissociates into two ions: Ca2+ and 2Cl-.

Therefore, the concentration of ions = 2 × 0.1227 M= 0.245 M.

Therefore, the concentration (in m) of ions, in a solution of 0.584 moles of CaCl2 dissolved in enough water to make 4.76 L of the solution is 0.245 M.

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The nurse should administer 0.5ml of meperidine hydrochloride injection.

Meperidine hydrochloride is an analgesic drug which acts on the central nervous system used for the treatment of moderate to severe pain which requires opioid treatment. It is a very strong pain killer and sometimes has severe side effects like mood swings, nausea, etc. it may also lead to addiction and thus needs to be taken only in the dosage prescribed by a physician.

Given:

Stock concentration: 100mg/ml

Working concentration: 50mg

To find:

Volume = ?

Formula:

Volume = Working concentration / stock concentration

Calculations:

Volume = 50 / 100

Volume = 0.5ml

Result:

0.5ml of the meperidine hydrochloride injection should be administered by the nurse.

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Answer:

An ion is an atom or molecule that has a different number of electrons than protons, so it has a charge.

Explanation:

Trust me please

Answer:

Elementary substance, since it is in the periodic table of elements.

Hope that helps!

-SCSB

Explanation:

Litmus paper and Phenolphthalein are both indicators. This means they will change colour in the presence of an acid or a base.

Litmus paper turns blue in a base and remains red when it is in contact with an acid or neutral solution. Phenolphthalein turns pink in a base, but is coluorless in an acid or neutral solution.

Using the data you acquired from the tube in the dish containing 0.05 M NaOH, predict it would take for glucose absorbed in the gut to diffuse to muscles in your foot is I: 8,000 minutes (about 133 hours).

Diffusion is a process resulting from the movement of molecules where the flow moves from an area of high concentration to an area of low concentration.

In this definition, the difference in concentration of two solutions is also known as a concentration gradient. Even though there is no difference in concentration, movement of molecules can still occur to reach equilibrium.

The process of diffusion also occurs in the human body. diffusion is the process of moving particles of a substance from a high concentration solution to a low concentration solution to achieve equilibrium.

An example of diffusion in the human body is when we inhale, the alveoli expand and oxygen enters the lungs. Then, when you exhale, the alveoli collapse and carbon dioxide leaves the body. Well, this process occurs because molecules move from high to low concentrations.

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The complete ionic equation Ca(OH)2 + HClO4 → H2O + Ca(ClO4)2.

A complete ion equation describes all ions dissociated in a chemical reaction. The net ion equation cancels out ions appearing on either side of the reaction arrow. This is because they do not inherently participate in the desired reaction. An annihilated ion is called a spectator ion.

The net ionic equation describes only the species participating in the reaction while the full ionic equation also includes the spectator ion. The net ion equation must be balanced by both mass and charge. Mass balance means ensuring that the mass of each element on the product side and the educt side is equal.

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Answer:

A Transverse Wave

They would be attracted with the uncharged object.

It occurs because of the electric field of negative and positive charges . The negative attracts positive ions of the uncharged object and the positive does the opposite one. Therefore, they attract with the uncharged object.

Answer: The charged objects will attract the uncharged object

Pls brainliest

Answer:

slingshot or throw it

Explanation:

Answer:

500g Ika= 10.85 mol 500g (46.0699) - 10.35 mol - 3.00m - 13.62 kq 5.

Explanation:

Does this help?

A 3.00 M solution of \(C_2H_5OH\) would be prepared by dissolving 0.500 kg of  \(C_2H_5OH\) in 3.62 kg of water.

0.500 kg  \(C_2H_5OH\) is equivalent to (mole = mass/molar mass):

      500g/46.07 = 10.85 moles of  \(C_2H_5OH\)

3.00 M solution of  \(C_2H_5OH\) can be prepared by dissolving 10.85 moles in (molarity = moles/volume):

                      10.85/3 = 3.62 Liters of water

3.62 liters of water weighs (density = mass/volume);

              1 x 3.62 = 3.62 kg

Thus, 3.62 kg of water will be required to prepare the solution.

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Answer:

Hello!

Gold is a chemical element with symbol Au (from Latin: aurum) and atomic number 79. In its purest form, it is a bright, slightly reddish yellow, dense, soft, malleable, and ductile metal. Chemically, gold is a transition metal and a group 11 element.

So in short, the Correct Answer will be (D) an Element.

Hope that Helps! Have A Wonderful Day! ☺

Explanation:

Gold is an example of chemical element with symbol Au aurum and atomic number 79, lightly reddish yellow, dense, soft, malleable, and ductile metal.

Atomic number of an element  is defined as total number of protons present in the nucleus,  neutrons carry no net electrical charge, so it is the charge number of the nucleus.

atomic mass of an element can be defined as the atomic weight is measured total mass of an element’s atom, the total number of neutrons and protons in the nucleus of an atom.

Both Atomic mass and an atomic number of elements are closely related if  atomic number is high, then the atomic mass is also said to be high.

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Answer:

Specific chemical sugar glucose

Explanation:

When we say “blood sugar,” we mean the specific chemical sugar glucose. Diabetes is all about glucose. There lots of sugars….table sugar is sucrose, malt sugar is maltose, milk sugar is lactose, and you’ve probably heard of fructose.

Blood sugar, or glucose, is the main sugar found in your blood. It comes from the food you eat, and is your body's main source of energy. Your blood carries glucose to all of your body's cells to use for energy.

Pls mark me brainiest and my name is Misty.

Answer:

36

Explanation:

Se has a negative charge of -2

in order for that to be possible there has to be 2 more negative charges than positive chrages

in other words

34 protons 36 electrons

34+ 36-

The number-average molecular weight of the polypropylene is approximately 63,120 g/mol.

The repeat unit molecular weight of polypropylene can be calculated by summing the atomic weights of all the atoms in the monomer unit. The monomer unit of polypropylene is:

CH3-CHCH2

The atomic weights of the atoms in this monomer unit are:

C = 12.01

H = 1.008

Adding these atomic weights gives:

12.01 + 3(1.008) + 2(12.01) + 1.008 = 42.08 g/mol

Therefore, the repeat unit molecular weight of polypropylene is approximately 42.08 g/mol.

The number-average molecular weight of a polymer is given by the formula:

Mn = (ΣNiMi) / ΣNi

where Ni is the number of polymer chains with molecular weight Mi.

For a polypropylene with a degree of polymerization of 1500, the number of polymer chains is:

N = 2^(n-1) = 2^(1500-1) = 1.76 x 10^450

Assuming a polydispersity index of 1.0, which means all polymer chains have the same molecular weight, the number-average molecular weight can be calculated as:

Mn = (N)(M) / N = M

where M is the molecular weight of a single polymer chain.

The molecular weight of a single polymer chain can be calculated by multiplying the repeat unit molecular weight by the degree of polymerization:

M = (repeat unit molecular weight) x (degree of polymerization)

M = 42.08 g/mol x 1500

M = 63,120 g/mol

Therefore, the number-average molecular weight of the polypropylene is approximately 63,120 g/mol.

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Answer:

The acid will be neutralized overtime

Explanation:

The presence of the pyrites leads to the leaching of large amounts of sulphuric acid, however the basic carbonates neutralizes the acid according to the reaction equation;

CaCO3 + H2SO4 ---> CaSO4 + CO2 + H2O.

This will prevent all the deleterious consequences associated with the leaching of the acid in the abandoned coal mine.

Answer:

false

Explanation:

standard form is Potassium hydrogen phthalate

first, we need the molar mass of HNO3(azotic acid) it's equal to 1AH+1AN+3AO(where A is the atomic mass of the element present within the molecule and, it's multiplied by how many times it's present)=1*1+1*14+3*16=15+54=69g/mole

now we multiply the molar mass with the number of moles 69*1.2=82.8 grames

Answer:

A thermodynamic quantity equivalent to the capacity of a system to do work.

Explanation:

Photosynthesis:

Reactants - H2O + CO2;

Products - CsH12O6 + O2

Cellular Respiration:

Reactants - CsH12O6 + O2;

Products - H2O + CO2

Explanation:

Photosynthesis:

Reactants -

H2O + CO2Products - CsH12O6 + O2

The process of converting light energy to chemical energy occurs in photosynthesis, which occurs in plant cells.

The process of photosynthesis entails the use of carbon dioxide (CO2) and water (H2O) to produce organic molecules such as glucose (C6H12O6) and oxygen (O2).

The reaction for photosynthesis is 6CO2 + 6H2O -> C6H12O6 + 6O2. In addition, the process of photosynthesis entails two stages: light-dependent reactions and light-independent reactions.

Cellular Respiration:

Reactants - CsH12O6 + O2Products - H2O + CO2

Cellular respiration is the process by which cells transform nutrients into adenosine triphosphate (ATP). When oxygen is present, cellular respiration occurs. Aerobic respiration is another name for cellular respiration.

The three main stages of cellular respiration are glycolysis, the citric acid cycle, and the electron transport chain. C6H12O6 + 6O2 -> 6CO2 + 6H2O + 38 ATP is the reaction for cellular respiration.

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Answer:

grass

Explanation:

only the grass would actively have photosynthesis occur. frogs and honeybees do not use photosynthesis to produce "food". tree trunks are not the part of the organism that performs photosynthesis.

Answer: Grass!

Explanation: Grass produces food for itself through a process called photosynthesis, Just like trees. Leaves soak up light  Thats what the word photo means In "Photosynthesis" And then the light soaked up from the leaves and a chemical occurs called chlorophyll

The red subatomic particles being referred to in this question are likely electrons, which are negatively charged particles that are located outside the nucleus in the electron cloud of an atom.

Electrons are not counted into the mass of the atom, which is primarily determined by the protons and neutrons in the nucleus. Electrons occupy discrete energy levels around the nucleus and play a critical role in chemical reactions and bonding. The number of electrons in an atom is equal to the number of protons in the nucleus, making atoms electrically neutral overall. Therefore, option (b), "located in the electron cloud not counted into the mass of the atom, negatively charged," is the most accurate description of electrons in an atom.

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          A device sprays coating material (paint, ink, varnish, etc.) through the air onto a surface when using the spray painting technique. The most popular varieties atomize and guide the paint particles using compressed gas, often air.

        Volatile Organic Compounds are present in a large number of commonly used professional spray paints (VOCs). VOCs are a group of compounds that are released as gases from a range of solids and liquids, some of which may be harmful to human health in the short- and long-term.

        When a valve button is depressed, aerosol paint, also known as spray paint, is released from a sealed, pressurized container in an aerosol spray. One type of spray painting is aerosol painting, which leaves a smooth, even coat in contrast to many conventional rolled and brushed paints.

         Not every change in color results from a chemical shift. If one were to alter a substance's color through a non-chemical interaction, such as painting an automobile, the alteration would be physical rather than chemical.

        Spray paints come in aerosol cans and are liquid paints. The top of a can  of spray paint has a button that, when depressed, releases paint. Compressed gas is used in aerosol spray cans as a liquid propellant.

          A million times faster than brush-on paint is spray paint. Since spray paint is often oil based rather than water based, it is more durable than conventional latex paint or spray paint. Using spray paint outside is simple when you have a drop cloth and some newspaper handy.

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Answer:

oxygen

Explanation:

Putting the jar over the candle keeps oxygen from outside the jar from getting in. The reaction can only use the oxygen that is already in the jar. So, when that oxygen is used up, the reaction can't keep going. Running out of oxygen makes the flame go out.

​

The heat of the flame vaporizes the liquid wax (turns it into a hot gas), and starts to break down the hydrocarbons into molecules of hydrogen and carbon. These vaporized molecules are drawn up into the flame, where they react with oxygen from the air to create heat, light, water vapour (H2O) and carbon dioxide (CO2).

Combustion

And when you light a candle you use the candle's wax as fuel for a chemical reaction called combustion which involves reacting hydrocarbons with oxygen, breaking them down into carbon dioxide and water.

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Answer:

42g if CaO can be produced from 30g and 31.5g of CaO will be produced from 18g of O

Explanation:

40g of CA =56g

30g =×

cross multiple

=56*30/40

=42g

32g of O =56g

18g =×

cross multiple

=56*18/32

=31.5g

theoretical yield

42-31.5= 10.5

just guessing

The elements that have the same number of valence electrons are silicon and carbon. The answer is option C and D. An element is a pure substance that cannot be separated into any simpler substances by chemical means. The periodic table is made up of elements.

These are some of the characteristics of an element: All atoms of an element have the same number of protons in their nucleus, which is the atomic number. The majority of an element's properties are determined by the number of electrons in its outermost shell. This is also referred to as the valence shell. Silicon and carbon both have four valence electrons. They both belong to Group 14, which is also known as the Carbon Group, on the periodic table, which includes elements with four valence electrons. Therefore, Silicon and Carbon both have the same number of valence electrons. The answer is option C and D

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Answer:

D

Explanation:

Fractional distillation is more efficient than simple distillation in separating two miscible liquids because it utilizes a fractionating column, which provides multiple stages for vapor-liquid contact.

Fractional distillation is a method used to separate two or more miscible liquids based on their boiling points. It involves the use of a fractionating column, which is a tall column packed with materials such as glass beads or metal plates. The column provides numerous stages where vapor and liquid can come into contact.

During fractional distillation, the mixture is heated, and the vapor rises through the fractionating column. As the vapor ascends, it cools down, and when it reaches a stage with a temperature below its boiling point, it condenses and returns to the liquid phase. This process is repeated as the liquid continues to evaporate and condense multiple times while moving up the column.

The fractionating column allows for efficient separation because it provides a large surface area for vapor-liquid contact. The repeated evaporation and condensation cycles enhance the separation of the different components in the mixture. The compounds with lower boiling points will tend to condense and collect at the higher stages of the column, while those with higher boiling points will condense and collect at the lower stages.

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Answer:

metals donate electrons to nonsmetals