Red bloods cells are placed into a solution of sodium chloride. The cells have an osmolarity of 300 mOsm, and the solution has an osmolarity of 250 mOsm. In which direction would there initially be net water flow

Answer: freezing the juice will not change its mass

Explanation: CK-12 states of matter

Answer:

The s-block and p-block together are usually considered main-group elements, the d-block corresponds to the transition metals, and the f-block encompasses nearly all of the lanthanides (like lanthanum) and the actinides (like actinium).

Explanation:

A mixture is a combination of substances that does not chemically react together.

A mixture is a combination of substances that does not chemically react together. Now in this mixture we have  powdered copper, powdered charcoal, and powdered magnesium.

If we add dilute acid, the powdered magnesium would be dissolved and then leave the mixture. If we could separate the powdered copper from the powdered charcoal by sieving.

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Answer:

4Al +3O2 --> 2Al2O3

Explanation:

they are balanced

First of all, we must know the Avogadro's number:

1 mol of CO2 = 44.0 g (from the molar mass) = 6.02x10^23 molecules of CO2

How must we proceed?

44.0 g CO2 ------------6.02x10^23 molecules CO2

2.59 g CO2 ------------ x

x = 3.54x10^22 molecules CO2

Answer: 3.54x10^22 molecules CO2

The actual molarity of the NaOH solution can be different from the calculated molarity due to several factors such as impurities, measurement errors, variations in temperature, and differences in the purity of the chemical reagents used.

To determine the actual molarity of the NaOH solution, we would need to perform an experiment to measure the concentration of the solution. This can be done using methods such as titration with a standardized acid solution. If the actual molarity of the NaOH solution is determined to be different from the calculated molarity, adjustments can be made to the experimental procedure or the preparation of the solution to improve the accuracy of the result.

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Observation to show excess zinc oxide:

If the student observes that there is some undissolved solid zinc oxide remaining in the reaction mixture even after stirring for a long time, it indicates that zinc oxide is in excess.

Reason for using excess zinc oxide:

Excess zinc oxide is used rather than excess hydrochloric acid because zinc oxide is insoluble in water, while hydrochloric acid is soluble. Therefore, adding excess hydrochloric acid would result in excess acid remaining in the solution and contaminating the pure crystals of zinc chloride.

Another compound that could be added to hydrochloric acid to produce zinc chloride:

Zinc sulfate (ZnSO4) could be added to hydrochloric acid to produce zinc chloride.

Obtaining crystals of zinc chloride from a solution:

The student can obtain crystals of zinc chloride from a solution by evaporating the solvent, typically water, to a smaller volume, allowing the solute to become more concentrated. The solution should then be left to cool slowly to allow the crystals of zinc chloride to form. The crystals can be separated from the solution by filtration, washed with cold water, and dried to obtain pure crystals of zinc chloride.

4) The temperature went up by 3 degrees

5) The reaction is exothermic

6) The burning of hydrocarbons is an exothermic reaction

One of the characteristics of a chemical change is that there could be a change in the temperature of the system. The temperature of the system could be found to have been increased or decreased as the case may be.

In any case, the change in the temperature of the system is what is going to tell is whether the reaction was exothermic or endothermic. If the reaction is endothermic, there is going to be a drop in temperature but if the reaction is exothermic, there is going to be an increase in temperature.

Now we can see from the table that the temperature is increasing by a factor of about three degrees so we can say that the reaction is exothermic.

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Answer:

I think it would be B. But your lymph nodes swell when you are sick because of irritation and infection.

Explanation:

Answer:

3

Explanation:

The correct name for FeO is iron(II) oxide. Iron(II) oxide indicates that the iron ion in the compound has a +2 oxidation state.

The formula FeO consists of one iron atom with a +2 charge and one oxygen atom with a -2 charge. Therefore, the Roman numeral (II) is used to denote the oxidation state of iron.

Iron(II) oxide is commonly known as ferrous oxide. It is a black, powdery substance that occurs naturally as the mineral wüstite. It is used in various applications, including as a pigment in ceramics and as a catalyst in chemical reactions. Iron(II) oxide can also be produced by the reduction of iron(III) oxide with carbon monoxide at high temperatures.

It's worth noting that iron(III) oxide (Fe2O3) is another common iron oxide, commonly known as ferric oxide or rust. Iron monoxide (FeO) is not an accurate name for the compound since it implies a single atom of oxygen, which is not the case. Similarly, iron(I) oxide does not represent the correct oxidation state for iron in FeO.

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The ph of a 0.5m solution of an acid with a pKa of 8.4 is 6.91 (approx.)  

To find the pH of a 0.5 M solution of an acid with a pKa of 8.4, we can use the Henderson-Hasselbalch equation:

pH = pKa + log([A⁻]/[HA])

Where [A⁻] is the concentration of the conjugate base and [HA] is the concentration of the acid. We can assume that the initial concentration of the acid is 0.5 M, and that it is fully dissociated in solution.

So, [A⁻] = 0.5 M and [HA] = 0 M.

Now, we can substitute these values into the equation:

pH = 8.4 + log(0.5/0)

Since the logarithm of 0 is undefined, we can simplify the equation to:

pH = 8.4 + log(0.5)

Using a calculator, we can solve for the pH:

pH = 6.91

Therefore, the pH of a 0.5 M solution of an acid with a pKa of 8.4 is approximately 6.91.

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1. Mechanical Energy – This is the energy possessed by a body due to its motion or position. It includes kinetic energy (energy of motion) and potential energy (stored energy of position).

Energy is the capacity to do work. It is present in many forms such as kinetic, potential, thermal, electrical, and chemical energy. Kinetic energy is the energy of motion, while potential energy is the energy due to position or shape. Thermal energy is the energy of heat, while electrical energy is the energy of charged particles, such as electrons. Chemical energy is the energy stored in the bonds between atoms. All of these forms of energy are capable of doing work, and can be converted into one another. On the whole, energy is the capacity to cause change in the physical world.

2. Thermal Energy – This is the energy of a system due to its temperature. It is also known as heat energy.
3. Electrical Energy – This is the energy created by the flow of electrons through a conductor.
4. Chemical Energy – This is the energy stored in the bonds between atoms in a chemical compound.
5. Nuclear Energy – This is the energy released from the nucleus of an atom when it splits or fuses.

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Answer:

874.59

Explanation:

The number after 9 is 1

1 is lower than 5 so we leave the previous number the same

The number 874.591 correct to 2 decimal places is 874.59.

A decimal is a fraction written in a special shape. as opposed to writing 1/2, for example, you could express the fraction because the decimal 0.5, where the 0 is inside the one vicinity and the 5 is within the tenths vicinity. Decimal comes from the Latin phrase decimus, meaning tenth, from the root phrase decem, or 10.

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Chemistry is composed of many sub-disciplines such as inorganic chemistry, physical chemistry, biochemistry, organic chemistry, analytical chemistry etc. The following is a matching of certain projects against the sub-discipline in chemistry where they rightfully belong.

1) Determine the composition of a moon rock sample..... analytical chemistry

2) Do research on making a new medicine to treat high blood pressure..... biochemistry

3)  Investigate ways to regulate the rate of gasoline burning in an automobile engine......physical chemistry

4) Develop a plastic that can be decomposed by bacteria......organic chemistry

5) Improve the method for extracting iron from iron ore.....inorganic chemistry

The sub-disciplines of chemistry all work together to make the world a better place. The science of chemistry is very pivotal hence it is applicable in every area of science and technology.

Analytical chemistry, as the name implies, deals with "analyzing" or finding out the components of materials.

Biochemistry is concerned with the study of molecules that have biological activity such as medicine to treat high blood pressure.

One key area of physical chemistry is chemical kinetics which discusses rates of chemical reactions. This sub-discipline is important when investigate ways to regulate the rate of gasoline burning in an automobile engine.

Organic chemistry is the chemistry of carbon compounds. It studies compounds that contain long chains of carbon such as those found in plastics.

Inorganic chemistry deals with the study of the elements including the extraction of elements such as iron from its ore.

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C. physical change

Explanation:

That's the answer

mercury is not a mixture it is a element

Answer:

mercury

Explanation:

Answer:

n=N/NA

n= 3.754×10²³/6.02×10²³

n= 6.24 s

Explanation

since there is number of molecules, make use of Avogadro's constant to get number of moles.

1. The limiting reagent is sulfur trioxide, SO₃ and the excess reagent is water, H₂O

2. The mass of the excess reagent leftover is 14.92 g

3. The mass of sulfuric acid, H₂SO₄ is produced is 8.06 g

The limiting and excess reagent can be obtained as follow:

SO₃ + H₂O -> H₂SO₄

From the balanced equation above,

80 g of SO₃ reacted with 18 g of H₂O

Therefore,

6.58 g of SO₃ will react with = (6.58 × 18) / 80 = 1.48 g of H₂O

From the above calculation, we can see that only 1.48 g of H₂O out of 16.4 g is needed to react completely with 6.58 g SO₃.

Thus, the limiting reagent is SO₃ and the excess reagent is H₂O

The mass of the excess reagent leftover can be obtained as follow:

Mass of excess reagent, H₂O leftover = Mass given - mass reacted

Mass of excess reagent, H₂O leftover = 16.4 - 1.48

Mass of excess reagent, H₂O leftover = 14.92 g

The mass of H₂SO₄ produced can be obtained as illustrated below:

SO₃ + H₂O -> H₂SO₄

From the balanced equation above,

80 g of SO₃ reacted to produce 98 g of H₂SO₄

Therefore,

6.58 g of SO₃ will react to produce = (6.58 × 98) / 80 = 8.06 g of H₂SO₄

Thus, the mass of H₂SO₄ produced is 8.06 g

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Answer:

ooooooooooo0000000000000

Large particles usually get smaller as a result of surface reactions. Both heating and freezing effects of tiny particles on the climate are seen.

Weathering can be classified as either physical or chemical. There is a wide variety in soil particle size due to variations in weathering processes.The overall surface area increases when the size is reduced more. This is significant since most chemical changes start at an object's surface.

The Earth's materials are the four major elements that make up the earth's crust. The earth is made up of minerals, rocks, soil, and water. Earth materials include the necessary building components for life, agriculture, and industry.

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The number of moles of NaF that will be produced from 3moles of Na is 3 moles.

Stoichiometry is the study and calculation of quantitative (measurable) relationships of the reactants and products in chemical reactions (chemical equations).

According to this question, sodium reacts with fluorine as follows:

2Na+ F₂ → 2NaF

Based on the above equation, 2 moles of Na will produce 2 moles of NaF

This means that 3 moles of Na will produce 3 moles of NaF.

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Taking into account the definition of density, the density of the sample is 0.5 \(\frac{g}{mL}\).

It is necessary yo know that density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.

In other words, density allows you to measure the amount of mass in a certain volume of a substance.

Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:

\(density=\frac{mass}{volume}\)

In this case, you know:

Then, replacing in the definition of density:

\(density=\frac{6 g}{12 mL}\)

Solving:

density= 0.5 \(\frac{g}{mL}\)

Finally, the density of the sample is 0.5 \(\frac{g}{mL}\).

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Answer:

See explanation

Explanation:

Qualitative analysis in chemistry is a method used to determine the ions present in a solution chiefly by means of chemical reactions.

In this case, I suspect the presence of silver ions and/or barium ions. The first step is to add dilute HCl. This will lead to the precipitation of the silver ion as AgCl. If a white precipitate is formed upon addition of HCl then Ag^+ is present in the solution.

Secondly, I add a carbonate such as NH4CO3(aq). This will cause the barium ions to become precipitated as barium carbonate. Hence, the formation of a white precipitate when NH4CO3(aq) is added to the solution indicates the presence of barium ion in the solution.

Answer:

As you go down the periodic table, usually atoms get bigger because n gets bigger (there are electrons in higher shells). Effective nuclear charge does get bigger too going down the periodic table, but this effect is smaller than the change in shell.

Explanation:

Explanation:

 It drowns out some of the more delicate notes. It changes the flavour balance.

The coordination number of cobalt in the complex ion [Co(en)Cl4]⁻ is 6.

Therefore the answer is 6.

The coordination number of a metal ion in a complex ion refers to the number of ligands (molecules or ions that bind to the metal ion) that are coordinated or bound to the metal ion. In the complex ion [Co(en)Cl4]^-, the metal ion is cobalt (Co) and the ligands are the ethylenediamine (en) and chloride (Cl) ions.

The complex ion [Co(en)Cl4]^- has six ligands coordinated to the Co ion: four chloride ions and two ethylenediamine molecules. This means the coordination number of cobalt in this complex ion is 6.

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