Answer: it feels good, because that person cares about you
Explanation:
Suppose that 22 mL of 0.1 M K2CrO4 reacts with 14.6 mL of AgNO3 completely. What mass of NaCl is needed to react completely with 35.2 mL of the same AgNO3 solution?
Answer in units of g.
According to the solving 0.0427 g of NaCl is needed to react completely with 35.2 mL of 0.1 M AgNO3.
What is a chemical reaction with an example?A chemical reaction is an event in which reactants chemically reacts and transform into products chemically. As an illustration, during respiration, oxygen is inhaled and combines with glucose to create carbon dioxide, water, and energy.
According to the given information:K₂CrO₄ + 2 AgNO₃ → 2 KNO₃ + Ag₂CrO₄
the moles of AgNO3 used in the reaction with K2CrO4 is:
n(AgNO3) = (14.6 mL) (0.1 mol/L)
= 1.46 × 10⁻³ mol
Since the same amount of AgNO3 is used in the reaction with NaCl, we can calculate the moles of NaCl needed to react completely with 35.2 mL of 0.1 M AgNO3:
n(NaCl) = n(AgNO3) / 2
= (1.46 × 10⁻³ mol) / 2
= 7.3 × 10⁻³ mol
To calculate the mass of NaCl needed, we can use its molar mass:
M(NaCl) = 58.44 g/mol
Mass of NaCl needed = n(NaCl) x M(NaCl)
= (7.3 × 10⁻⁴ mol) x (58.44 g/mol)
= 0.0427 g
0.0427 g of NaCl is needed to react completely with 35.2 mL of 0.1 M AgNO3.
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Suppose 239. 7 mg of PbCl2 was added to 15. 0 mL of water in a flask, and the solution was allowed to reach equilibrium at 20. 0 oC. Some solute remained at the bottom of the flask after equilibrium, and the solution was filtered to collect the remaining PbCl2, which had a mass of 83. 6 mg. What is the solubility of PbCl2 (in g/L)?
The solubility of PbCl2 in water (H2O) at 20.0 °C (temperature) is 10.407 g/L.
First, we need to calculate how much PbCl2 actually dissolved in the water. The amount of PbCl2 that did dissolve is the difference between the initial amount of PbCl2 added and the amount of PbCl2 that remained after filtering:
Initial amount of PbCl2 = 239.7 mg
Amount of PbCl2 remaining after filtering = 83.6 mg
Amount of PbCl2 that dissolved = 239.7 mg - 83.6 mg = 156.1 mg
Next, we can use the density of water at 20.0 °C, which is 0.9982 g/mL, to calculate the volume of the solution:
Volume of solution = 15.0 mL = 0.015 L
Finally, we can calculate the solubility of PbCl2 in g/L:
Solubility of PbCl2 = amount of PbCl2 that dissolved / volume of solution
Solubility of PbCl2 = 156.1 mg / 0.015 L
Solubility of PbCl2 = 10406.7 mg/L
Solubility of PbCl2 = 10.407 g/L
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(28) CCC Cause and Effect Young's modulus is a measure
of a solid material's stiffness. A highly ductile
material will typically have a very low modulus. The
table shows several different metals, their crystalline
structure, and their Young's modulus. Describe the
pattern you observe and explain the connection
between structure and stiffness.
From the table, it is very clear that as the crystallinity increases, its stiffness also increasing. The FCC structures are having less crystallinity and is more ductile than BCC structure.
What is ductility of a material ?Ductility of a material is the ability to make very thin elongated wires. Whereas, stiffness of a material is the resistance to any elongation or compression.
The more crystalline the material, more will be the stiffens. The material with higher Young's modulus (Y) are more crystalline and stiff. As Y decreases, stiffness decreases, the material becomes ductile.
Because the body-centered cubic (BCC) lattice is not tightly packed despite being cubic, the face-centered cubic (FCC) crystalline structure has greater ductility than the BCC.
Due to the fact that a hexagonal close-packed (HCP) lattice is densely packed but not cubic, HCP metals are less ductile than BCC and FCC metals.
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The lattice structure of ionic solid consists of positive ions and negative ions held together by ionic bonds. Describe the lattice structure of a molecular solid Ionic compound?
The lattice structure of a molecular solid Ionic compound are mentioned below.
What is lattice structure?
An asymmetrical three-dimensional structural arrangement of ions, atoms, and molecules to create a unit cell is called a lattice or a crystal lattice. The kind of crystal lattice is determined by a unit cell's substantial and distinctive geometrical shape. Every ion, atom, or molecule in a crystal structure's unit cell represents a point in a three-dimensional space.
What is ionic compound ?
An ion with a positive charge is a cation, whereas one with a negative charge is an anion.
Therefore, The lattice structure of a molecular solid Ionic compound are mentioned above.
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Deposition is a process that… A: moves rock particles. B: drops sediment. C: breaks down rock. D: dissolves sediment
Answer:
cbbb vdf jfjd hx
Explanation:
In the SciShow video above, Hank Green says "Science isn't good or bad. It's only true," then later says "The science doesn't care. It's up to us to decide what we do with it." Do you agree with these statements? Why or why not? Use specific examples to support your answer.
Is the world better off with or without Fritz Haber? Explain your stance. How should we think about the total impact of someone's life?
Science could be used either for good or for bad depending on the user. This can be observed from the life of Fritz Haber described below.
Is the world better off with or without Fritz Haber?Fritz Haber was a German chemist who made significant contributions to the fields of chemistry and agriculture, and he is known for developing the process of synthesizing ammonia, which is used in fertilizer production. However, he is also known for his involvement in the development and use of chemical weapons during World War I.
Overall, it is difficult to make a definitive statement about whether the world is better off with or without Fritz Haber. His contributions to science and agriculture have been important, but the development and use of chemical weapons are atrocities that cannot be ignored. It is important to acknowledge and learn from both aspects of his legacy.
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A table is titled Effect of Speed on Kinetic Energy. A blank graph is shown to the right.
A table shows the mass in kilograms, the speed in meters per second and the kinetic energy in Joules for four trials. The last column, titled Drag to Graph, displays a car icon. Trial 1: Mass is 2; Speed is 1; Kinetic Energy is 1. Trial 2: Mass is 2; Speed is 2; Kinetic Energy is 4. Trial 3: Mass is 2; Speed is 3; Kinetic Energy is 9. Trial 4: Mass is 2, Speed is 4; Kinetic Energy is 16. A blank graph is shown to the right. The vertical axis is titled Kinetic Energy, Joules. It is labeled from 0 to 20 in increments of two. The horizontal axis is titled Speed, meters per second. It is labeled from 0 to 5 in increments of one.
Car 1
Car 2
Car 5
Car 4
Based on the given information, we can plot the data points on the blank graph to see the effect of speed on kinetic energy:
Vertical axis: Kinetic Energy (Joules)
Horizontal axis: Speed (meters per second)
Define the term kinetic energy.
The energy an object has as a result of its motion is known as kinetic energy. It is a scalar quantity and is defined as one-half of the product of an object's mass and the square of its velocity. Mathematically, it can be represented as:
Kinetic Energy = 1/2 x mass x [tex]velocity^{2}[/tex]
where mass is the mass of the object in kilograms and velocity is the speed of the object in meters per second.
Kinetic energy is a form of mechanical energy and can be transferred between objects in collisions or other interactions. It is a fundamental concept in physics and is used to understand and describe the behavior of moving objects in various physical systems.
The data points are:
Trial 1: Mass=2, Speed=1, Kinetic Energy=1
Trial 2: Mass=2, Speed=2, Kinetic Energy=4
Trial 3: Mass=2, Speed=3, Kinetic Energy=9
Trial 4: Mass=2, Speed=4, Kinetic Energy=16
Therefore, The graph shows that as the speed increases, the kinetic energy also increases. The relationship between speed and kinetic energy is quadratic, which means that the kinetic energy increases with the square of the speed.
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I NEED THIS FAST!!
How many grams are in 9.100 X 10/20 molecules of uranium(V) oxide, U2O5?
Explanation:
Refer to pic............
Theory of Plate Tectonics: Complete the sentence:
1. The theory of plate tectonics states that the
is broken into pieces called
slowly moving due to
It is believed that tectonic plates move as a result of convection in the asthenosphere and gravity.
What are Tectonic plates?According to the widely recognized scientific hypothesis known as plate tectonics, the Earth's lithosphere is made up of many sizable tectonic plates that have been steadily moving for nearly 3.4 billion years.
A tectonic plate, also known as a lithospheric plate, is a sizable slab of solid rock with an uneven shape that is typically made up of both continental and oceanic lithosphere. The Pacific and Antarctic Plates are among the largest plates, but they can range in size from a few hundred to thousands of kilometers broad.
Thus, it follows that convection in the asthenosphere and gravity are thought to be the causes of tectonic plate movement.
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(ALOT OF QUESTIONS) if anybody sees this can they help me out?
Which of the following statements is true about strong, weak, and nonelectrolytes?
A) Strong electrolytes partially dissociate in water, weak electrolytes partially dissociate, and nonelectrolytes completely dissociate.
B) Strong electrolytes partially dissociate in water, weak electrolytes completely dissociate, and nonelectrolytes do not dissociate.
C) Strong electrolytes completely dissociate in water, weak electrolytes do not dissociate, and nonelectrolytes partially dissociate.
D) Strong electrolytes completely dissociate in water, weak electrolytes partially dissociate, and nonelectrolytes do not dissociate.
Which of the following substances is insoluble in water, according to these solubility rules?
A) Sodium chloride (NaCl)
B) Calcium hydroxide (Ca(OH)2)
C) Potassium nitrate (KNO3)
D) Silver chloride (AgCl)
Which of the following ions is soluble in water when paired with according to the solubility rules chart?
C) Chloride (Cl-)
B) Sulfate
D) Hydroxide (OH-)
A) Carbonate
Question 12 (1.25 points)
Which of the following combinations will result in a precipitate, according to solubility rules?
A) Sodium nitrate (Na2CrO4) and barium chloride (BaCl2)
B) Ammonium chloride (NH4Cl) and sodium hydroxide (NaOH)
C) Calcium sulfate (CaSO4) and sodium carbonate (Na2CO3)
D) Potassium iodide (KI) and silver nitrate (AgNO3)
Question 13 (1.25 points)
Which of the following statements is true about dilute and concentrated solutions?
A) Dilute solutions have a higher solvent-to-solute ratio than concentrated solutions.
B) Concentrated solutions contain more solute than dilute solutions.
C) Dilute solutions contain more solute than concentrated solutions.
D) Concentrated solutions have a higher solvent-to-solute ratio than dilute solutions.
Question 14 (1.25 points)
What volume of a 0.500 M sodium chloride solution is required to make 500. mL of a 0.100 M sodium chloride solution?
A) 100 L
B) 0.100 ml
C) 0.100 L
D) 1 L
Question 15 (1.25 points)
A student has a 0.500 M solution of hydrochloric acid (HCl) that is too concentrated for an experiment. The student needs to dilute the solution to 0.100 M. If the student needs 250 mL of the diluted solution, how much of the original solution should be used?
A) 250 ml
B) 50.0 ml
C) 125 ml
D) 500 ml
The statement that is true about strong electrolytes , weak electrolytes , and non-electrolytes is:
Strong electrolytes completely dissociate in water, weak electrolytes partially dissociate, and nonelectrolytes do not dissociate. Option DSilver chloride (AgCl) is insoluble in water; option D.
Chloride (Cl-) ion is soluble in water; option C
Potassium iodide (KI) and silver nitrate (AgNO₃) will result in a precipitate, according to solubility rules; option D.
Dilute solutions have a higher solvent-to-solute ratio than concentrated solutions; option A.
What volume of a 0.500 M sodium chloride solution is required to make 500 mL of a 0.100 M sodium chloride solution?The volume of sodium chloride solution required is calculated using the formula:
M1V1 = M2V2Where:
M1 = 0.500 M (initial concentration)
V1 = volume of initial solution (unknown)
M2 = 0.100 M (final concentration)
V2 = 500 mL = 0.500 L (final volume)
Rearranging the formula to solve for V1, we get:
V1 = M2V2/M1
V1 = (0.100 M)(0.500 L)/(0.500 M)
V1 = 0.100 L
The volume of the 0.500 M sodium chloride solution required is 0.100 L.
15. The volume of the original solution required will be;
M1V1 = M2V2
Where:
M1 = 0.500 M (initial concentration)
V1 = volume of initial solution (unknown)
M2 = 0.100 M (final concentration)
V2 = 250 mL = 0.250 L (final volume)
Rearranging the formula to solve for V1, we get:
V1 = M2V2/M1
V1 = (0.100 M)(0.250 L)/(0.500 M)
V1 = 0.050 L or 50.0 mL
The volume of the original 0.500 M hydrochloric acid solution needed is 50.0 mL.
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Suppose 316.0g aluminum sulfide reacts with 493.0g of water.
2Al2S3 + 6H2O = 2AlOh3 + 3H2S
a. How many grams of hydrosulfric acid can be formed.
b. Determine the limiting reactant.
c. How many grams of the excess reactant remains.
d. Determine the percent yield of hydrofluoric acid, if in an experiment 203g were formed.
a) 107.1 g of hydrosulfric acid can be formed.
b) Aluminium sulfide is the limiting reactant.
c) 378g of excess reactant remains.
d) 52.75 % is the percent yield.
What is Limiting reactant?The limiting reactant or limiting reagent is a reactant in a chemical reaction that determines the amount of product that is formed.
Identification of the limiting reactant can help calculate the theoretical yield of a reaction.
Given the reaction,
2Al₂S₃ + 6 H₂O = 2Al(OH)₃ + 3H₂S
Mass of aluminium sulfide = 316g
Mass of water = 493 g
Moles = Mass ÷ molar mass
Moles of Aluminium sulfide = 316 ÷ 150
= 2.10 moles
Moles of water = 493 ÷ 18
= 27.3 moles
Since moles of aluminium sulfide is less, it is the limiting reagent.
From the reaction, 2 moles of aluminium sulfide gives 3 moles of H₂S.
1 moles of Al₂S₃ will give 3 ÷ 2 moles of H₂S.
Thus, 2.1 moles of Al₂S₃ will give 1.5 × 2.1 moles
= 3.15 moles of H₂S
Mass of H₂S = Moles × molar mass
= 3.15 × 34 = 107.1 g
From the reaction, 2 moles of aluminium sulfide gives 6 moles of H₂O.
1 mole will need 3 moles of water.
Thus, 2.1 moles will need 3 × 2.1 moles = 6.3 moles of water
Excess of water = 27.3 - 6.3 = 21 moles
Mass of excess reactant = 21 × 18 = 378g
Actual yield of H₂S = 203g
Theoretical yield = 107.1 g
% yield = (107.1 × 100) ÷ 203 = 52.75 %
Therefore,
a) 107.1 g of hydrosulfric acid can be formed.
b) Aluminium sulfide is the limiting reactant.
c) 378g of excess reactant remains.
d) 52.75 % is the percent yield.
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pls help!!!!! and please provide explanation i will give brainlist
A) To calculate the total bond energy, we need to know the bonds broken and formed in the reaction. In this case, the reactants are C₂H₄ and H₂, and the product is C₂H₆.
Reactants:
C₂H₄ has one C=C bond and four C-H bonds. Total bond energy
= (1 x 614 kJ/mol) + (4 x 413 kJ/mol) = 2462 kJ/mol
H2 has one H-H bond. Total bond energy
= 1 x 436 kJ/mol = 436 kJ/mol
Products:
C₂H₆ has six C-H bonds and one C-C bond.
Total bond energy
= (6 x 413 kJ/mol) + (1 x 348 kJ/mol) = 2862 kJ/mol
Total energy = reactant energy - product energy = (2462 kJ/mol + 436 kJ/mol) - 2862 kJ/mol = 36 kJ/mol
Therefore, the total bond energy for the reaction is 36 kJ/mol.
B) The reaction is exothermic because the total energy is negative (-36 kJ/mol). This means that energy is released when the reaction occurs.
C) The formation of C-C bond releases energy (348 kJ/mol), and the breaking of C=C bond requires energy input (614 kJ/mol). The formation of four C-H bonds releases energy (4 x 413 kJ/mol = 1652 kJ/mol), and the formation of two additional C-H bonds releases more energy (2 x 413 kJ/mol = 826 kJ/mol). The breaking of one H-H bond requires energy input (436 kJ/mol).
The total energy released by the formation of new bonds is greater than the energy required to break the old bonds, resulting in an exothermic reaction.
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If I have 0.4 moles of a gas at a temperature of 17 C and a volume of 7.0 L, what is the
pressure of the gas?
Answer:
4.20 atm
Explanation:
PV = nRT
convert the temperature from Celsius to Kelvin:
T(K) = T(C) + 273.15
T(K) = 17 + 273.15
T(K) = 290.15 K
plug in the values:
n = 0.4 moles
V = 7.0 L
R = 0.08206 L atm / (mol K) (Gas constant)
T = 290.15 K
PV = nRT
P = nRT / V
P = (0.4 moles) x (0.08206 L atm / (mol K)) x (290.15 K) / (7.0 L)
P = 4.20 atm (rounded to two significant figures)
Therefore, the pressure of the gas is 4.20 atm.
Calculate the equilibrium constant for the chemical reaction, given the equilibrium concentrations of the reactants and products in the table.
2AB(aq)+4CD(aq)↽−−⇀2AD(aq)+2BD(aq)+4C(aq)
The value of the equilibrium constant is independent of the initial concentration of the reactants. It has a definite value for every reversible reaction at a particular temperature.
What is equilibrium constant?The equilibrium constant can be defined as the ratio of the product of molar concentrations of the products to that of the reactants with each concentration term raised to a power equal to its coefficient in the balanced chemical equation.
The expression of the equilibrium constant is:
Keq = [AD]² [BD]² [C]⁴ / [AB]²[CD]⁴
Thus the expression of the equilibrium constant is determined.
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The following equation represents a laboratory preparation for oxygen gas: 2KClO3 (s) —------> 2KCl (s) + 3O2 (g)
If 4 moles of oxygen are produced how many moles of potassium chloride are produced?
If 4 moles of oxygen are produced, 2.66 moles of potassium chloride are produced in the given laboratory preparation.
What is mole concept?
Avogadro's number is the number of units in one mole of any substance and equals to 6.02214076 × 10²³. The units can be electrons, atoms, ions, or molecules.
No. of moles is defined as a particular no. of particles that we can calculate with the help of Avogadro’s number.
Given,
laboratory preparation for oxygen gas:
2KClO₃ (s) —------> 2KCl (s) + 3O₂ (g)
Moles of oxygen = 4 moles
When 3 moles of oxygen are produced 2 moles of potassium chloride are produced.
When 1 mole of oxygen are produced 2/3 moles of potassium chloride are produced.
Hence, 4 moles of oxygen are produced (2÷3)×4 = 2.66 moles of potassium chloride are produced.
Therefore, if 4 moles of oxygen are produced, 2.66 moles of potassium chloride are produced in the given laboratory preparation.
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You fill a rigid steel cylinder that has a volume of 20. 0 L with 10. Moles of nitrogen gas at 313 ºK. What is the final pressure in kPa in the cylinder?
Answer:
The quantity of nitrogen the cylinder contains is 4477.8 g
Explanation:
hope this helps u out:))
Answer:
Assuming ideal gas behavior, we can use the ideal gas law:
PV = nRT
where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.
First, we need to convert the temperature from Celsius to Kelvin:
T = 313 ºK
The gas constant R is 8.31 J/(mol·K), but we need to use a value in units of kPa·L/(mol·K) for the pressure and volume units given:
R = 8.31 kPa·L/(mol·K)
Plugging in the given values, we have:
P × 20.0 L = 10.0 mol × 8.31 kPa·L/(mol·K) × 313 K
Solving for P, we get:
P = (10.0 mol × 8.31 kPa·L/(mol·K) × 313 K) / 20.0 L
P = 1293 kPa
Therefore, the final pressure in the cylinder is 1293 kPa.
i need help due im 20 mins
If we decrease the temperature to 200 K at constant pressure, what would the new volume be?
A. 6.67 L
B. 10 L
C. 13.3 L
D. 5 L
If we decrease the temperature to 200 K at constant pressure, 13.3 L would the new volume .
What is temperature?
Temperature is a unit used to represent how hot or cold something is. It can be stated using the Celsius or Fahrenheit scales, among others. Temperature shows which way heat energy will naturally flow, i.e., from a hotter (body with a higher temperature) to a colder (body with a lower temperature) (one at a lower temperature).
What is pressure?
As force applied per unit area, pressure is defined. P=FA, where F is the force operating perpendicular to the surface area A, gives it mathematical expression. The pascal (Pa), which equates to a newton per square metre (N/m 2), is the accepted unit of pressure.
Therefore, If we decrease the temperature to 200 K at constant pressure, 13.3 L would the new volume .
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How many coordinate covalent bonds, if any, does the ion AT3 have? A has 5
valence electrons, and T has 6 valence electrons. Both A and T cannot exceed the
octet. Explain your answer. Be sure to consider the Lewis structure with the proper
formal charges to determine your answer.
The ion AT3 has a total of 22 valence electrons: 5 from A and 6 from T, multiplied by 3 since there are three T atoms.
What is ion AT3?Generally, To determine the number of coordinate covalent bonds, we need to draw the Lewis structure and check the formal charges.
If A donates three electrons to each T atom, it will have a formal charge of +2 (5 valence electrons - 3 donated electrons - 0 non-bonding electrons). Each T atom will have a formal charge of -1 (6 valence electrons - 3 donated electrons - 2 non-bonding electrons).
The Lewis structure for AT3 will have single bonds between A and each T atom, and each T atom will have a lone pair of electrons.
The total number of electrons used in the bonds is 6 (2 from each bond). The remaining 16 electrons will be distributed among the three T atoms as lone pairs.
Therefore, there are no coordinate covalent bonds in the ion AT3.
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According to Bernoulli's Principle, what type of relationship do fluid velocity and pressure share?
Positive, because as the velocity of a fluid increases, so does the pressure.
Negative, because as the velocity of a fluid increases the pressure decreases.
Neutral, because velocity and pressure do not correlate in fluids.
The right response is "Negative, since pressure reduces as fluid velocity rises." The best choice is B.
What are two illustrations of the Bernoulli principle?As a vehicle goes quickly, it creates a low pressure region, which causes dust to be pushed along in it. As a swift train passes by us while we are in the platform, we are drawn toward the rail due to the low pressure created by the train's extreme speed.
What does the Bernoulli principle mean for children?According to Bernoulli's principle, an item experiences various pressures as air travels about it. Less pressure results from faster air. More pressure results from slower air.
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The Complete Question :
According to Bernoulli's Principle, what type of relationship do fluid velocity and pressure share?
A. Positive, because as the velocity of a fluid increases, so does the pressure.
B. Negative, because as the velocity of a fluid increases the pressure decreases.
C. Neutral, because velocity and pressure do not correlate in fluids.
In what ways are the buffering abilities of carbon sinks being reduced by climate change?
There is a different way to contribute to the CO₂ budget balance besides reducing or turning off this carbon, which would help reduce the amount of greenhouse gases in the atmosphere. However, that depends on the precise amount of carbon that the oceans, trees, and plants are absorbing.
What are the buffering abilities of carbon sinks?The carbon sinks in the cycle have so far had plenty of extra capacity. In fact, since we began burning fossil fuels for energy after the Industrial revolution, about half of the carbon dioxide emissions released into the atmosphere have naturally cycled away again.
A quarter of this carbon dioxide dissolves in water, so the oceans have absorbed it. As they used sunlight to turn it into glucose and oxygen during photosynthesis, plants use up an additional quarter.
The airborne carbon that was captured now exists as trees or is buried in peat, grassland, and soils. It is submerged in the water, dissolving in the deep ocean, or drifting as sediment on the seafloor. In other words, the planet has improved.
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If pressure of a gas is 722.4 torr and the volume is 3.79litre and the temperature is 300K what will be the no of moles?( can the gas eq constant be used in tore and atm)
Answer:0.146 torr
Explanation:
Yes to the gas constant
you use 0.0821 L.atm/mol.k If you want pressure in atm
use 62.44 L.torr/ mol.k if you want pressure in torr
n=PV/RT
n= 722.4 X 3.79/(62.44 X 300) =
How many moles of magnesium is 1. 25
x 1023 atoms of magnesium?
1.25 x 1023 atoms of magnesium contains 0.28. moles of magnesium.
A mole of any element contains Avogadro's number of that element's atoms. To find the number of moles of magnesium in 1.25 x 1023 atoms of magnesium, simply divide by Avogadro's number:
1.25 x
[tex] {10}^{23} [/tex]
magnesium atoms / 6.022 x
[tex] {10}^{23} [/tex]
atoms/mol = 0.208 moles magnesium
As a result, 1.25 x
[tex] {10}^{23} [/tex]
atoms of magnesium contain 0.208 moles of magnesium.
The number of particles (atoms, molecules, and ions) in one mole of a substance is represented by Avogadro's number, which is a fundamental constant in chemistry. It has a value of about 6.022 x
[tex] {10}^{23} [/tex]
particles per mole. The number was named after Italian scientist Amedeo Avogadro, who first proposed the concept in the early 19th century as a way to explain the relationship between the amount of a substance and its constituent particles.
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What type of change is making popcorn and why?
Answer:The answer is physical change.
Explanation: The reason for this is because when popcorn is in its original state/form it is inside of a tear like shell and then when it changes it is an odd shaped peice if popped corn. Simple way to know is its physicle apperance changes.
What gas in the air is used by plants to make their own food?
Nitrogen
Water vapor
Carbon dioxide
Oxygen
Answer:
Carbon dioxide
Explanation:
Carbon dioxide gas is used by plants for the preparation of food materials. During this food preparation process, plants take up carbon dioxide from the air and give up oxygen.
What is the pOH of a solution that has a [OH-] = 5.8 x 10^-9 *
A. 9.8
B. 5.8
C. 4.2
D. 8.2
6.84 is the pOH of a solution that has a [OH⁻] value 5.8 x 10⁻⁹. The correct option is option B among all the given options.
What is pOH?The concentration of hydroxide ions (OH-) is measured by pOH. It can be employed to express a solution's alkalinity.
Aqueous solutions containing pOH less than 7 at 25 degrees Celsius are alkaline, pOH larger than 7 are acidic, as well as pOH equal to 7 constitute neutral.
pOH = -log[ OH ]
pOH = -log[ 5.8 x 10⁻⁹ ]
= 5.84
Therefore, 6.84 is the pOH of a solution that has a [OH⁻] value 5.8 x 10⁻⁹. The correct option is option B among all the given options.
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Pls I need help urgently. If you continue to putting one drop of water on one side of the paper towel, what do you observe happening to the water, the more drop you add? Explain
Answer:
the water is being observed a bi paper towel material through a process called capillary action capital reaction on Sonu's capability is a rising or absorption
Answer: The water spreads out and covers a larger area on the paper towel.
What percent of magnesium bromide, MgBr2 is magnesium?
Answer:
percentage composition = 13.2%
Explanation:
percentage of magnesium in magnesium bromide can be found by molar mass of magnesium over molar mass of magnesium bromide.
Molar mass of elements can be found using a standard IUPAC Periodic Table.
M(Mg) = 24.31 g/mol
M(MgBr₂) = 24.31 + 79.90×2 = 184.11 g/mol
∴ percentage composition = 13.2%
If a gas mixture has 10.0 moles of N2 and 4.00 moles of O2 and a total pressure of 2.36 atm, what is the partial pressure of O2?
Answer: 0.25 atm
Explanation:
Which of the following units would you use to describe the mass of baking soda needed for a reaction?
Gram
Meter
Mole
Pound
The mass of baking soda required for a reaction is measured in grammes.
How are masses expressed in grammes?The metric system uses the gramme and kilogramme as its two primary units for measuring mass. Using the common metric prefixes, we can derive the remaining metric units from the gramme. A paper clip weighs roughly one gramme.
How do you use a scale to measure mass in grammes?Using balancing scales is one method of determining an object's mass. Place the item you want to weigh on one side of a balance scale, then add gramme masses to the opposite side until the scales are level. Typically, masses for weighing come in 1 g and 5 g units.
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