Give an example of something that is observable but does not contain matter.
Explain.

Final answer:

To calculate the grams of NiCO3 formed, the moles of Na2CO3 used are first calculated, then converted to moles of NiCO3 using the stoichiometry of the reaction, and finally, the mass of NiCO3 is found by multiplying its moles by its molar mass, resulting in 0.324 g of NiCO3.

Explanation:

To find out how many grams of NiCO3 will be formed, we first need to write the balanced chemical equation for the reaction between NiCl2 and Na2CO3.

However, the provided question does not specify the exact reaction formula; typically, such a reaction would produce NiCO3 and NaCl. Assuming a reaction of the form NiCl2 + Na2CO3 → NiCO3 + 2 NaCl, and that NiCl2 reacts completely with Na2CO3, the next step is to calculate moles of Na2CO3 since its volume and molarity are given (14.3 mL of 0.191 M).

Moles of Na2CO3 = Volume (L) * Molarity = 0.0143 L * 0.191 mol/L = 0.00273 mol. Since the reaction is in a 1:1 molar ratio, the moles of NiCO3 produced will also be 0.00273 mol. To find the mass of NiCO3 formed, multiply the moles by the molar mass of NiCO3 (approximately 118.7 g/mol).

Mass of NiCO3 = Moles * Molar mass = 0.00273 mol * 118.7 g/mol = 0.324 g (rounded to three significant figures).

Answer:

the correct answer is indeed solid

Explanation:

solids have compressed matter making them have a definite shape and volume

Answer:

b. unicellular prokaryotes

Explanation:

Most of the bacteria are primitive organisms that is why they are not very advanced in terms of cellular organelles and body functions. They do not have high level of organization in their body like presence of tissues, organs, organ systems etc. because they are only single celled organisms that is why they are known as unicellular organisms. A single cell performs all the functions required to sustain life. Their genetic material is very primitive type of structure which does not have any nuclear membrane or nuclear envelop. It is circular in shape and lies in the cytoplasm and it is known as nucleoid instead of nucleus.

For example: E. coli.

The majority of bacteria are classified as unicellular prokaryotes, meaning they are composed of a single cell and lack a nucleated cell structure.

Most bacteria are unicellular prokaryotes. Unicellular means that they are organisms composed of a single cell. Prokaryotes refer to organisms that do not have a nucleus and other specialized organelles in their cells, which is common in bacteria. One important distinction of prokaryotes, including bacteria, is that their DNA is not stored in a nucleus, unlike eukaryotes. In contrast, eukaryotes, whether unicellular or multicellular, have a nucleus to house their DNA in addition to other specialized organelles.

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Density is an intensive property as it does not depend on the quantity of the substances Whereas mass and volume are extensive property The  mass of the glucose solution that fills a 1.00 l intravenous bottle is  1500g.

Density tells about the compactness of the substances, how much dense is the substances in other words. Object that is more denser than water they just sink in the water.

Mathematically,

Density = Mass of the glucose solution ÷volume of  intravenous bottle

Volume of the intravenous bottle =  1.00l=  1.00 l*1000=1000ml

Density of glucose solution = 1.15 g/ml

Substituting all the values in above formula, we get

Mass of the glucose solution = Density*volume of  intravenous bottle

Mass of the glucose solution =1.15 g/ml*1000ml

Mass of the glucose solution = 1500g

Therefore, the mass of the glucose solution that fills a 1.00 l intravenous bottle is  1500g.

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        This process, known as cellular respiration, uses oxygen and glucose to produce ATP, carbon dioxide, and water. Since they are what is produced, ATP, carbon dioxide, and water are all byproducts of this process.

      Oxygen and glucose are transformed into water and carbon dioxide during cellular respiration. By-products of the process include carbon dioxide, water, and ATP, which is turned into energy.

        ATP and H2O are the last byproducts of cellular respiration. Two pyruvate molecules, four ATPs (a net of two ATP), two NADH, and two H2O are produced during glycolysis. Therefore, glycolysis is the only process that may take place in the absence of oxygen, and only two ATP molecules may be created for each glucose molecule.

          Adenosine triphosphate (ATP), carbon dioxide, and water are the three byproducts of cellular respiration.

          The Krebs cycle, also known as the citric acid cycle, electron transport, and glycolysis are the three processes that make up cellular respiration.

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Final answer:

Weighing CaSO₄ precipitate before it is completely dried will result in an overestimation of the moles and concentration of the analyte, known as a positive determinate error in gravimetric analysis.

Explanation:

If a precipitate of CaSO₄ was weighed before it was completely dried, the likely impact of this error on the calculated moles of CaSO₄ would be that the measured mass is higher than the true mass of the dry CaSO₄. This is because the precipitate would contain additional water, which contributes to the overall mass. Since the stoichiometric calculation of moles is based on the mass of the precipitate, having extra mass from the water will result in an overestimation of the moles of CaSO₄. Therefore, the calculated concentration of the analyte in the sample will also be higher than it should be. This type of error is termed a positive determinate error in gravimetric analysis and it affects not just the stoichiometry, but also the reported percentage purity or concentration of the analyte within the sample.

There are 3.7 moles in 100.0 g of aluminum

HOW TO CALCULATE NUMBER OF MOLES:

no. of moles = mass ÷ molar mass

Molar mass of Aluminum = 27g/mol

no. of moles = 100g ÷ 27g/mol

no of moles = 3.703mol

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Answer: The periodic elements are arranged by their atomic number.

Answer:

D

Explanation:

Bromine

Final answer:

The molarity of the HCl solution is 0.1174 M.

Explanation:

To calculate the molarity of the HCl solution, we can use the equation:

M1V1 = M2V2

Using the values given in the question:

M1 = Molarity of HCl solution = unknown

V1 = Volume of HCl solution = 25.00 mL = 0.025 L

M2 = Molarity of NaOH solution = 8.670x10^-2 M

V2 = Volume of NaOH solution = 34.30 mL = 0.0343 L

Plugging in these values into the equation, we get:

M1(0.025) = (8.670x10^-2)(0.0343)

M1 = (8.670x10^-2)(0.0343) / 0.025

M1 = 0.1174 M

Answer:Balanced half-reaction for the reduction of gaseous nitrogen to aqueous hydrazine is :

[tex]N_2(g)+4H^+(aq)+4e^-\rightarrow N_2H_4(aq)[/tex]

Explanation:

Half reaction will be written as:

[tex]N_2(g)\rightarrow N_2H_4(g)[/tex]

Balance the atoms in half reaction other than oxygen and hydrogen.

In acidic medium the hydrogen atom is balanced by adding [tex]H^+[/tex] ions.

[tex]N_2(g)+4H^+(aq)\rightarrow N_2H_4(aq)[/tex]

Now balance the charge on both the sides by adding electrons on that side where positive charge is greater.

[tex]N_2(g)+4H^+(aq)+4e^-\rightarrow N_2H_4(aq)[/tex]

Balanced half-reaction for the reduction of gaseous nitrogen to aqueous hydrazine is :

[tex]N_2(g)+4H^+(aq)+4e^-\rightarrow N_2H_4(aq)[/tex]

Final answer:

The balanced half-reaction for the reduction of gaseous nitrogen (N2) to aqueous hydrazine (N2H4) in an acidic solution is N2(g) + 4 H+(aq) + 4 e- → N2H4(aq). This reaction demonstrates the balance of both the number of atoms and the overall charge in a redox process.

Explanation:

To balance the half-reaction for the reduction of gaseous nitrogen (N₂) to aqueous hydrazine (N₂H₄) in an acidic aqueous solution, we need to ensure that the number of nitrogen atoms and the overall charge is balanced on both sides of the reaction. The initial, unbalanced half-reaction is:

N₂(g) + H₂(g) → N₂H₄(aq)

First, we balance the nitrogen atoms by noting that there are still two nitrogen atoms present on both sides of the equation, so no change is needed here.

Then, to balance hydrogen atoms, we add 4 H⁺ ions to the right side:

N₂(g) + H⁺(aq) → N₂H₄(aq)

To balance the charge, we need to add electrons to the side with a positive charge. Since we have added four protons (4 H⁺ ions) on the right side, we must balance the charge by adding 4 electrons to the left side:

N₂(g) + 4 H⁺(aq) + 4 e⁻ → N₂H₄(aq)

All atoms and the charge are now balanced, making this the correct reduced half-reaction for the reduction of nitrogen to hydrazine in acidic solution.

B is the answer, hope this helps :D

Answer : The entropy change of the system is, 19.5 J/K

Solution :

Formula used :

[tex]\Delta S=\frac{n\times \Delta H_{vap}}{T_b}[/tex]

or,

[tex]\Delta S=\frac{\frac{w}{M}\times \Delta H_{vap}}{T_b}[/tex]

where,

[tex]\Delta S[/tex] = entropy change of the system = ?

[tex]\Delta H[/tex] = enthalpy of vaporization = 30.7 kJ/mole

n = number of moles of benzene

w = mass of benzene = 17.5 g

M = molar mass of benzene = 78 g/mole

[tex]T_b[/tex] = normal boiling point of benzene = [tex]80.1^oC=273+80.1=353.1K[/tex]

Now put all the given values in the above formula, we get the entropy change of the system.

[tex]\Delta S=\frac{\frac{17.5g}{78g/mole}\times (30.7KJ/mole)}{353.1K}=0.0195kJ/K=0.0195\times 1000=19.5J/K[/tex]

Therefore, the entropy change of the system is, 19.5 J/K

The inferred pressure and temperature at the boundary of Earth's stiffer mantle and outer core are very high, reaching up to several million atmospheres and exceeding 5000 degrees Celsius, respectively.

At the boundary between Earth's stiffer mantle and outer core, the pressure and temperature are very high due to the immense weight and heat of the overlying material. The pressure can reach up to several million atmospheres, while the temperature can exceed 5000 degrees Celsius. These extreme conditions are necessary to maintain the liquid state of the outer core and the solid state of the inner core.These extreme conditions are necessary to maintain the liquid state of the outer core and the solid state of the inner core.These extreme conditions are necessary to maintain the liquid state of the outer core and the solid state of the inner core.

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In Physics, of the listed naturally-occurring radioactive particles, beta particles carry a negative charge.

In the field of Physics, there are several types of naturally-occurring radioactive particles, which include alpha particles, neutrons, gamma radiation, and beta particles. Of these, it is the beta particles that carry a negative charge. Alpha particles, on the other hand, are positively charged. Neutrons do not carry a charge. Finally, gamma radiation is actually a form of electromagnetic radiation, and thus, it also does not carry a charge.

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