Answer:
The answer is C
Explanation:
Mendeleev’s periodic table arranged elements in order of increasing atomic mass; it was noticed that chemical properties repeated. Mendeleev predicted an element had not been discovered to fit the space.
Which naturally-occurring radioactive particles are negatively charged? 1. alpha particles 2. neutrons 3. gamma radiation 4. beta particles?
In Physics, of the listed naturally-occurring radioactive particles, beta particles carry a negative charge.
Explanation: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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Problem page write a balanced half-reaction for the reduction of gaseous nitrogen n2 to aqueous hydrazine n2h4 in acidic aqueous solution. be sure to add physical state symbols where appropriate.
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.
What is the density of hydrogen sulfide (h2s)?
200 ml of a 0.500 m ca(no3)2 solution was made, but only 150 ml of solution are needed. if you pour out 50 ml of the soultion, what is the concentration, in m, of the 150 ml of solution you have left.
The space around the nucleus of an atom where the atom's electrons are found is called the
The periodic table includes all of the known elements in the world. how are elements arranged on the periodic table?
Answer: The periodic elements are arranged by their atomic number.
The outermost layer of Earth is called the mantle. Please select the best answer from the choices provided T F
Δh = -296 kj/mol (a) how much heat is evolved when 585 g sulfur is burned in excess o2
The common pathway for the oxidation of glucose and fatty acids is ________.
How many moles of hydrogen atoms are in 10.3 g of methane (ch4)?
How many grams of nico3 will be formed when a 0.300 m nicl2 solution reacts completely with 14.3 ml of a 0.191 m na2co3 solution?
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).
In a particular gravimetric analysis, the precipitate of caso4 was weighed before it was completely dried. the likely impact of this error on the calculated moles of caso4 will be:
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.
Which description identifies the correct charge of each atomic particle?
A.
electron = positive; proton = negative; neutron = no charge
B.
electron = negative; proton = positive; neutron = no charge
C.
electron = no charge; proton = negative; neutron = positive
D.
electron = negative; proton = no charge; neutron = positive
All atoms are neutral. explain the basis of this fact
most bacteria are
A.unicellular eukaryotes
b. unicellular prokaryotes
c,multicellular eukaryotes
d, multicellular prokaryotes
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.
Explanation: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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Products are what is created during a reaction what are the three products of cellular respiration
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.
What three byproducts do cells produce during respiration?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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what are the inferred pressure and temperature at the boundary of earths stiffer mantle and outer core
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.
Explanation: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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The first ionization energies of the elements __________ as you go from left to right across a period of the periodic table, and __________ as you go from the bottom to the top of a group in the table.
Which element listed below would have chemical properties similar to fluorine?
Answer:
D
Explanation:
Bromine
A total of 2.00 mol of a compound is allowed to react with water in a foam coffee cup and the reaction produces 189 g of solution. the reaction caused the temperature of the solution to rise from 21.00 to 24.70 ∘c. what is the enthalpy of this reaction? assume that no heat is lost to the surroundings or to the coffee cup itself and that the specific heat of the solution is the same as that of pure water.
How many moles of aluminum exist in 100.0 g of aluminum?
There are 3.7 moles in 100.0 g of aluminum
HOW TO CALCULATE NUMBER OF MOLES:
The number of moles contained in a substance can be calculated by dividing the mass of that substance by its molar mass. That is;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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What is the entropy change of the system when 17.5 g of liquid benzene (c6h6) evaporates at the normal boiling point? the normal boiling point of benzene is 80.1°c and δhvap is 30.7 kj/mol?
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
In the reaction of fe3o4 with carbon to form carbon dioxide and iron, the number of moles of carbon required to convert 23 g of fe3o4 to products is
What is the mass of a glucose solution that fills a 1.00 l intravenous bottle if the density of the glucose solution is 1.15 g/ml?
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.
What is density?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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which type of cell is a rose thorn A prokaryotic B eukaryota plant C eukaryotic animal D chloroplastic
B is the answer, hope this helps :D
tooth fillings are often made of gold or porcelain because those materials are not what?
How is the energy level of an atom's valence electrons related to the period in the periodic table?
Which state of matter characterized by having a definite shape and a definite volume?
Answer:
the correct answer is indeed solid
Explanation:
solids have compressed matter making them have a definite shape and volume
How is the number of neutrons in the nucleus of an atom calculated (1 point)?
A 25.00 ml sample of hcl solution requires 34.30 ml of 8.670x10^-2m naoh solution to reach the end point. calculate the molarity of the hcl solution
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