Answer: 23
Explanation:
because it is been multiplyed by 3 has s 31 nucleons and has atomic numbe equal to 15. The number of electron having m = 0 i
Answer:
The number of electrons with magnetic quantum number m = 0 can be calculated from the atomic number of the element. The atomic number gives the number of protons, and thus the number of electrons in a neutral atom. For the anion X-3, we have 15 - 3 = 12 electrons. The magnetic quantum number m can have integer values from -j to +j, where j is a half-integer representing the total angular momentum quantum number of the electron. In this case, j can be equal to 1/2, 3/2, 5/2, and so on. For the lowest value of j, which is 1/2, the magnetic quantum number m can have two values, +1/2 and -1/2. Thus, there are two electrons with m = 0. The number of electrons with m = 0 is equal to the number of electrons in the lowest energy level, which is the 1s orbital. In this case, two electrons occupy the 1s orbital, and both have m = 0.
Explanation:
Kinetic energy is proportional to the square of the car's speed. How do the tables and your graph on the previous page show this relationship?(must answer rn!!!)
Answer:
The Speed squared is equal to the Kinetic Energy
Explanation:
1^{2} = 1
2^{2} = 4
3^{2} = 9
4^{2} = 16
Therefore the data on the table proves that the Speed squared is equal to the Kinetic Energy
what is the main function of the mitochondria in a plant cell
Explanation:
The main function of the mitochondria in a plant cell is to generate energy for the cell through the process of cellular respiration. The mitochondria convert the energy stored in food into a form that the cell can use through the oxidation of glucose and other organic molecules, which produces ATP (adenosine triphosphate) - the energy currency of the cell. Additionally, the mitochondria play a role in regulating the cell's metabolic processes and also in controlling cell death (apoptosis).
Hospital patients are administered oxygen from an pressurized hyperbaric oxygen chamber at 3.0 atm. 600.0 L of oxygen is compressed in a cylinder at 160.0 atm. What volume of oxygen can a cylinder supply at the given pressure?
a. 32 × 103 L
b. 32 L
c. 11 L
d. 11 × 103 L
The volume of the oxygen cylinder at a pressure of 3.0 atm is 11.25 L. The closest answer choice to this value is option C. 11 L.
How did we get the value?We can use the ideal gas law, PV = nRT, to solve this problem. Here, P is the pressure, V is the volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature (assumed to be constant). Rearranging the equation, we get:
V = nRT/P
The number of moles of gas, n, can be found using the ideal gas law:
n = PV/RT
Substituting this expression for n into the equation for V and rearranging, we get:
V = PV/P = 600.0 L
So, at a pressure of 160.0 atm, the volume of the oxygen cylinder is 600.0 L. To find the volume of the oxygen cylinder at a pressure of 3.0 atm, we need to use the relationship between pressure and volume for a gas:
V1/V2 = P2/P1
Rearranging, we get:
V2 = V1 * (P2/P1) = 600.0 L * (3.0 atm / 160.0 atm) = 11.25 L
So, the volume of the oxygen cylinder at a pressure of 3.0 atm is 11.25 L. The closest answer choice to this value is (c) 11 L.
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When 6.50 moles of Calcium oxide
decomposes, how many moles of oxygen
gas are produced.
2 CaO --> 2 Ca + O2
The term mole concept is used here to determine the moles of oxygen gas produced. When 6.50 moles of Calcium oxide decomposes, 3.25 moles of oxygen gas is produced.
What is mole?One mole of a substance is that amount of it which contains as many particles or entities as there are atoms in exactly 12 g of carbon-12.
The given reaction is:
2 CaO → 2 Ca + O2
Here 2 moles of calcium oxide decomposes to give 2 moles of calcium and 1 mole of oxygen. So 6.50 moles CaO gives:
6.50 × 1 mol O₂ / 2 mol CaO = 3.25 mol O₂
Thus 3.25 mol O₂ is produced.
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How does a scientist make two solutions with the same molarity
a. By dissolving the same number of moles of each substance in the
same volume of water
B. By dissolving the maximum amount of each substance in the
same volume of water
C. By dissolving 1 mole of each substance in enough water to make
sure dissolving is complete
D. By dissolving the same number of grams of each substance in
ce in the
same volume of water
The concentration of a solution can be expressed in molarity, molality, mass percent, etc. By dissolving the same number of moles of each substance in the same volume of water a scientist make two solutions with the same molarity. The correct option is A.
What is molarity?The molarity of a solution is defined as the number of moles of the solute present per litre of the solution. It is usually expressed in mol / L. The equation used to calculate the molarity is:
Molarity = Number of moles of the solute / Volume of the solution in litres
The solutions with the same number of moles and volume have equal molarity.
Thus the correct option is A.
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The sugars we have been discussing are made directly through a series of reactions in the____ , which uses co2 as a starting input. a. light reaction a. recall, that under thermodynamic laws, building complex molecules requires the input of energy in the form of sunlight. that energy in photosynthesis comes from the . b. calvin cycle a. through a series of reactions in the , light energy is transformed into energy that is in the form of atp and high-energy electrons carried by nadph. b. in the , h2o is used and outputs as o2. a. in the , atp and nadph enter and output as adp and nadp.
The sugars we have been discussing are made directly through a series of reactions in the Calvin Cycle, which uses CO2 as a starting input.
Recall that under thermodynamic laws, building complex molecules requires the input of energy in the form of sunlight. That energy in photosynthesis comes from the Light Reaction. Through a series of reactions in the Light Reaction, light energy is transformed into energy that is in the form of ATP and high-energy electrons carried by NADPH. In the Light Reaction, H2O is used and outputs as O2. In the Calvin Cycle, ATP and NADPH enter and output as ADP and NADP. These processes work together to produce glucose and other sugars that are essential for life. The sugars we have been discussing are made directly through a series of reactions in the Calvin Cycle, which uses CO2 as a starting input.
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Sodium chlorate decomposes into sodium chloride and oxygen gas as seen in the equation below.
2NaClO3 --> 2NaCl +3O2
How many moles of NaClO3 were needed to produce 30 moles of O2? Round your answer to the nearest whole number.
Answer:
10 moles of NaClO3 were needed to produce 30 moles of O2
Explanation:
From the equation, we know that 2 moles of NaClO3 produce 3 moles of O2. To find out how many moles of NaClO3 are needed to produce 30 moles of O2, we divide the number of moles of O2 by the mole ratio:
30 moles O2 / 3 moles O2 per 2 moles NaClO3 = 10 moles NaClO3
So, 10 moles of NaClO3 were needed to produce 30 moles of O2.
To what volume should you dilute 0.20L of a 15.0M NaOH solution to obtain a 3.00M NaOH?
Answer: 1 L
Explanation: M1V1 = M2V2
Given :
M1 =15 M
V1=0.2 L
M2=3 M
V 2= ?
15 × 0.2 = 3V2
Thus, V 2=1 L
This table shows the relationship between the force on an object and the object's resulting acceleration.
Force vs. Acceleration
Force (N)
0
4
8
12
Acceleration
(m/s/s)
0
O 0.2 kg
O2 kg
O 0.5 kg
O 1 kg
2
4
6
What is the mass of the object?
HELP!!!!
2Kg is the mass of the object. Therefore, the correct option is option B among all the given options.
What is Acceleration?Acceleration is the rate at which velocity varies over time, both in terms of speed and direction. A point or object travelling in a straight path called accelerated if it accelerates or decelerates.
Regardless of whether the speed remains constant, movement on a circle becomes accelerated because of direction is always changing. Both redistribution to acceleration in all other types of motion.
F (N) Acceleration (m/s/s)
0 0
4 2
8 4
12 6
for the set 4,
F =ma
m = F/a
4/2=2
8/4= 2
12/6= 2Kg
Therefore, the correct option is option B.
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Your question is incomplete but most probably your full question was,
This table shows the relationship between the force on an object and the object's resulting acceleration.
F (N) Acceleration (m/s/s)
0 0
4 2
8 4
12 6
What is mass of the object?
A) 1Kg
B) 2Kg
C) 3Kg
D) 4Kg
If 45g of salt reacts with silver nitrate what mass of silver chloride will be produced.
If 45g of salt reacts with silver nitrate. Therefore, 110.24g is the mass of silver chloride will be produced.
What is sodium chloride?Sodium chloride, also known as salt (though sea salt contains additional chemical salts), is just an ionic substance with both the chemical symbol NaCl, signifying a 1:1 ratio of chloride and sodium ions.
One mole of sodium chloride, NaCl, creates one mole of silver chloride, AgCl, according to the balanced reaction. NaCl has a molar mass of 58.5 g and AgCl has a molar mass of 143.2 g/mol.
As a result, 58.5 g of sodium chloride yields 143.2 g of silver chloride. As a result, the mass of silver chloride generated by 45 g of sodium chloride is as follows:
AgCl mass = (143.2 g 45 g)/58.5 g
= 110.24 g
Therefore, 110.24g is the mass of silver chloride will be produced.
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Calculate strain energy for the conformer pictured below, using strain energy increments from the table.
Strain Energy for Alkanes
Interaction / Compound kJ/mol kcal/mol
H : H eclipsing 4.0 1.0
H : CH3 eclipsing 5.8 1.4
CH3 : CH3 eclipsing 11.0 2.6
gauche butane 3.8 0.9
cyclopropane 115 27.5
cyclobutane 110 26.3
cyclopentane 26.0 6.2
cycloheptane 26.2 6.3
cyclooctane 40.5 9.7
(Calculate your answer to the nearest 0.1 energy unit, and be sure to specify units, kJ/mol or kcal/mol. The answer is case sensitive.)
13.8 kJ [tex]mol-1\\[/tex] is strain energy for the conformer pictured below, using strain energy increments from the table.
The problem is based on the concept of used strain energy in the conformers.
When two non bonded groups approach each other, it results in repulsion and causes steric strain in the molecule.
Structure of conformer in eclipsed form in Newman projection is as follows:
4.0 kJ mo is energy of eclipsed H-H bond
Energy of eclipsedН-СH, 3 bond is 5.8 kJ mol
Total strain energy of conformer (S,)
E 2x eclipsed (H-H)+ eclipsed (H-CH,)
Replace eclipsed (H-H) with 4.0 kJ mol and eclipsed (H-CH) with 5.8 kJ mol to get
E 2x4.0 kJ mol +5.8 kJ mol =13.8 kJ mol
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One mole each of SO, and NO, were combined in a one-
liter container, and the following reaction was allowed to
come to equilibrium.
SO₂(g) + NO₂(g) = SO₂(g) + NO(g)
The equilibrium concentrations were found to be [SO₂] =
[NO₂] = 0.350 M and [SO,] = [NO] = 0.650 M. Calculate Kc
for the reaction.
Answer: Kc = 0.5625
Explanation: The equilibrium constant, Kc, can be calculated using the equilibrium concentrations of the reactants and products: Kc = ([SO₂] * [NO]) / ([SO] * [NO₂]) Plugging in the given concentrations: Kc = (0.350 * 0.650) / (0.650 * 0.350) Kc = 0.5625
A compound is found to have a molar mass of 598 g mol-1. If 39 mg of the compound is dissolved in enough water to make 162 mL of solution at 25 oC, what is the osmotic pressure of the resulting solution (in units of mbar). Report your answer to 1 decimal place. (R = 0.08314 bar L mol-1 K-1)
The osmotic pressure of a solution made by absorbing 0.822 g of it within 300 cm 3 of water is 149 mm Hg at 298 K. The solute has a molar mass of 342 g mol 1.
How can you determine a solute's molar mass?Calculate the molar mass of the solution using the depression at the freeing point (T f). Next, determine the moles of solute using the molality equation. To get the molar mass, divide the solute's mass in grams by the number of moles.
How do you determine the mass percent concentration of a solute and a solvent?The percentage of a solute in the solvent is one way to express a concentration of a solution. The percentage can be determined further in one of two ways the quantity determined by dividing the amount of the solute by the concentration of the sample.
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How would you calculate the molar mass of a compound?
Add together all the atomic masses of the component atoms to determine the molar mass of a compound containing numerous atoms.
What is the molar mass of Ca(NO3)2?
Add together all the atomic masses of the individual atoms to determine the molarity of the a compound with numerous atoms. Ca(NO3)2 has a molar mass of 164.1 g/mol.
What is an element's molar mass?The density in grams with one molar (6.02 x 1023 molecules) of a metal is its molar mass. Therefore, in the majority of circumstances, all you need to do is look at an element's atomic mass (atoms) on the periodical table to determine its molar mass. Keep in mind that it is the number that is listed beneath the element's name and symbol.
How is a substance's molar mass determined *?The mass in kilograms of one mole of an substance is its molar mass. As this video demonstrates the computed molar mass can then be used to translate between mass and the quantity of moles in the substance.
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An ___________________ that is useful for living in one type of ______________ may be useless in a different environment.
Organisms must live in a place that has the conditions they need to _____________
Organisms generally have adaptations that allow them to survive in one particular ______________.
An adaptation that is useful for living in one type of environment may be useless in a different environment. Organisms must live in a place that has the conditions they need to survive. Organisms generally have adaptations that allow them to survive in one particular enviroment.
What do adaptations in a particular enviroment mean?The expression adaptations in a particular enviroment mean that these traits are only advantageous regarding the enviroment.
Therefore, with this data, we can see that the adaptations in a particular enviroment can be detrimental or beneficial depending on the enviroment.
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The cytoplasm of a cell is filled with salts, sugars, proteins, and other molecules.
This means that cells usually have a lower concentration of water compared with
their external environment.
Considering this, what would happen if a cell were placed in
freshwater?
A. The cell would shrink as water moved along a concentration gradient from
low to high.
B. The cell would remain the same due to its semipermeable membrane.
C. The cell would shrink as water moved from an area of high solute
concentration to an area of low solute concentration.
D. The cell would burst as water moved into the cell along a concentration
gradient from high to low.
The cell would burst as water moved into the cell along a concentration gradient from high to low.
What would happen to a salt filled cell in fresh water?If a salt-filled cell is placed in fresh water, osmosis will occur. Osmosis is the diffusion of water molecules from an area of high concentration to an area of low concentration through a semi-permeable membrane. In this case, the semi-permeable membrane is the cell membrane that surrounds the salt-filled cell.
Since the concentration of salt inside the cell is higher than the concentration of salt in the fresh water, water molecules will move from the fresh water into the cell in an attempt to balance the concentration of salt on both sides of the membrane. This results in an increase in the volume of the cell, which can cause the cell to swell or even burst.
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Predicting Products in Precipitation Reactions:
Given the following compounds, predict what the reaction products would be?
Ie: potassium sulfate and barium nitrate
K2SO4 + Ba(NO3)2 KNO3 + BaSO4 (not balanced) BaSO4 is a precipitate
- Lithium chloride and silver hydroxide
-Sodium iodide and silver nitrate
-Calcium hydroxide and potassium carbonate
In precipitation reaction, two reactants in aqueous solution form an insoluble product, or precipitate, that separates from the solution.
What do you mean by precipitation reaction?
Precipitation reactions are chemical reactions in which two or more aqueous solutions react to produce an insoluble product, known as a precipitate. Precipitation reactions can occur between two ionic compounds, or between an ionic compound and a molecular compound.
The reaction products would be:
LiCl + AgOH → LiOH + AgCl
NaI + AgNO3 → AgI + NaNO3
Ca(OH)2 + K2CO3 → KOH + CaCO3
The products of these reactions are the insoluble compound formed, often referred to as the precipitate, and the two aqueous solutions that remain after the reaction has taken place. Examples of common precipitation reactions include those involving two salts, such as silver nitrate and sodium chloride, which form silver chloride, and the reaction between lead nitrate and potassium iodide, which form lead iodide.
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What type of reaction would most likely occur when magnesium reacts with bromine?
O Double Replacement
O Synthesis
O Decomposition
O Single Replacement
O Acid/Base (Neutralization)
Combustion
The type of reaction that would most likely occur when magnesium reacts with bromine is synthesis.
The correct option is B.
What is a synthesis reaction?Synthesis reactions are a particular kind of reaction in which several reactants combine to create a single product. It is a sort of chemical reaction in which two or more straightforward chemicals combine to create a more complicated end result. elements or compounds could be the reactants.
The reaction between magnesium and bromine is an example of a synthesis reaction and is shown below:
Mg + Br₂ ---> MgBr₂
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The operator of an ethanol production plant needs to estimate how much sugar is available in a
fermenter for conversion to ethanol. The fermenter contains 12,000 kg of a sugar solution. The
density of this sugar solution is 1.07 g/ml. Use this graph to estimate the total mass of sugar
available in the 12,000 kg solution.
The total mass of sugar that is available in 12000 kg is given as 2400
How to solve for the mass of sugarThe equation is y = 0.004256x + 0.9857
sugar solution has a density of 1.07
The concentration (X axis) is 20% at 1.07.
We are aware that the solution weighs 12000 kg.
So, the mass of sugar makes up 20% of the 12000 kg.
20 / 100 x 12000 = 2400
I have the answer: 2400 Kg.
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Can vitamins be a source of energy for muscle work?
Answer:
No
Explanation:
Vitamins cannot be a direct source of energy for muscle work. Vitamins play important roles in various metabolic processes, but they do not provide energy directly. Energy is primarily provided by the breakdown of carbohydrates, fats, and proteins. Vitamins are essential for the proper functioning of these metabolic processes and for the release of energy from these macronutrients.
Answer:
Vitamins are not a reliable source of immediate energy for working muscles. Vitamins are necessary for optimum health and for supplying energy for many metabolic processes, however they do not directly provide energy to muscles. The breakdown of glucose or glycogen, which is stored in muscle cells, is the main source of energy for muscle action. Although they are not an energy source in themselves, vitamins are essential for supporting the metabolic processes that turn glucose and glycogen into energy. Vitamin consumption must remain adequate to sustain healthy energy metabolism and overall health, but vitamins cannot take the place of the need for carbohydrates and other meals high in energy to power physical activity.
Hope it helps! : )Explanation:
A student wishes to prepare 500-mL of a 0.235 M chromium(II) nitrate solution using solid chromium(II) nitrate, a 500-mL volumetric flask, and deionized water.
(a) How many grams of chromium(II) nitrate must the student weigh out?
? g
(b) Which of the following would NOT be an expected step in the procedure used by the student?
A)Carefully weigh the flask.
B)Stopper the flask and invert it to mix the contents.
C)Add a small amount of water to the volumetric flask and swirl until the salt sample has dissolved.
The student needs to weigh out 18.055 g of chromium(II) nitrate.
What is mass?
Mass is a measure of the amount of matter in an object, typically measured in units of kilograms (kg), grams (g), or milligrams (mg). It is a scalar quantity, meaning it has magnitude but no direction.
(a) To prepare a 0.235 M solution of chromium(II) nitrate in 500 mL of water, we need to calculate the amount of chromium(II) nitrate that needs to be weighed out.
The formula weight of chromium(II) nitrate is Cr(NO3)2. Using the periodic table, we can find the atomic weights of the elements in this compound:
Cr: 52
N: 14
O: 16
So, the formula weight of chromium(II) nitrate is:
52 + 2(14 + 3(16)) = 154 g/mol
To prepare a 0.235 M solution, we need 0.235 moles of chromium(II) nitrate in 1 liter (1000 mL) of solution. In 500 mL of solution, we need:
0.235 moles/L x 0.5 L = 0.1175 moles
The mass of chromium(II) nitrate that contains 0.1175 moles can be calculated using the formula:
mass = moles x formula weight
mass = 0.1175 mol x 154 g/mol = 18.055 g
Therefore, the student needs to weigh out 18.055 g of chromium(II) nitrate.
(b) Option C, "Add a small amount of water to the volumetric flask and swirl until the salt sample has dissolved," would not be an expected step in the procedure used by the student. When preparing a solution in a volumetric flask, it is important to first add a portion of the solvent (in this case, water) to the flask, and then add the solute (chromium(II) nitrate) and mix it thoroughly to dissolve it. This is to ensure that the final volume of the solution is accurate, since the volumetric flask is calibrated to contain a specific volume of liquid only when filled to the mark after adding the solute.
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To what volume should you dilute 133 ml of an 7.95 M CuCl solution so that 52.0 mL of the diluted solution contains 4.20 g CuCl₂?
Answer:
172 ml
Explanation:
To determine the volume to which you should dilute 133 ml of a 7.95 M CuCl2 solution so that 52.0 mL of the diluted solution contains 4.20 g of CuCl2, you need to use the equation for molarity:
M = moles of solute / liters of solution
We know the moles of solute, which can be calculated from the mass of CuCl2 using the molar mass:
4.20 g CuCl2 / (1 mole CuCl2 / 134.45 g CuCl2) = 0.0311 moles CuCl2
And we know the volume of the diluted solution, which is 52.0 mL or 0.052 L. Plugging in these values, we can solve for the molarity of the diluted solution:
M = 0.0311 moles CuCl2 / 0.052 L = 0.596 M
Now that we know the molarity of the diluted solution, we can use the equation for dilution to determine the volume to which we should dilute the original solution:
C1V1 = C2V2
Where C1 and V1 are the concentration and volume of the original solution and C2 and V2 are the concentration and volume of the diluted solution. Plugging in the values, we have:
7.95 M * V1 = 0.596 M * 0.133 L
Solving for V1, we get:
V1 = 0.133 L * 0.596 M / 7.95 M = 0.0172 L = 172 mL
So, to achieve the desired concentration in 52.0 mL of the diluted solution, you should dilute 133 mL of the 7.95 M CuCl2 solution to a volume of 172 mL
See question in the picture below , will give brainliest for correct answer
Answer: I got you, As4S6 + 9O2 -> As4O6 + 6SO2
Explanation:
As4S6 + 9O2 -> As4O6 + 6SO2
4 As 4
6 S 1 6
18 2 O 8 18
if u coated the surface of a penny with a thin layer of a nonpolar liquid (oil) and then dropped alcohol and water onto the penny what would occur
When water is carefully dropped onto the surface of a penny, it can form a dome before spilling over the small lip around the penny's perimeter. Rubbing alcohol can also accumulate, but it will spill before forming a well-rounded dome.
What caused the water to spill over the penny?Cohesive forces are powerful, but not invincible. The force of gravity on the water molecules will eventually overcome the cohesive forces as a water drop builds up and out, usually bulging over the sides of the penny. The "skin" will rupture, allowing all the water to escape.
When the drops of water you add to the penny reach the penny's edge, the cohesion and surface tension of water become apparent.
Thus, When the water reaches the edge, a bubble or dome of water begins to form on top of the penny.
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the set of positions occupied by the three oxygen atoms
The three oxygen atoms can occupy three distinct positions in space. These positions can be identified by their coordinates in three-dimensional space.
What is the space?The space is an area or volume that exists between two or more objects, areas, or surfaces. In scientific terms, it is the distance between two points in three-dimensional space. It can also refer to a gap between two events, feelings, or other entities. In mathematics, space is a measure of the dimensionality of a given set, which can be described as the number of degrees of freedom within a given set. In physics, space is the physical realm of existence that encompasses all matter and energy. It is a fundamental component of reality and the universe.
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What does it mean for heat to be transferred by thermal conduction?
• A. Energy is transferred through converting bond energy to kinetic
energy.
•
B. Energy is transferred when one molecule collides with another.
• C. Energy is transferred when molecules absorb electromagnetic
waves.
®
D. Energy is transferred through moving currents of warmer air or
liquid.
The difference in temperature causes the transfer of heat from one point to another. Energy is transferred when one molecule collides with another. The correct option is B.
What is conduction?The process of transmission of energy from the particles of one medium to another as a result of the collision between the particles is defined as the conduction. An area with higher kinetic energy transfers thermal energy towards the area of lower kinetic energy.
When a substance is heated particles will gain more energy and vibrate more. These molecules then bump into nearby particles and transfer some of their energy to them. This then continues and passes the energy from hot end to the cold end.
Thus the correct option is B.
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1 point
Count the number of atoms in the formula: 3Al2(SO4)3
Al atoms
There are
type your answer...
There are
type your answer...
There are type your answer...
Satoms
O atoms
The total number of atoms is type your answer...
Al atoms: 6, S atoms: 9, O atoms: 36, The total number of atoms is 51.
what is 3Al2(SO4)3 ?
3Al2(SO4)3 is a chemical formula that represents the compound aluminum sulfate. It is also sometimes written as Al2(SO4)3.
Aluminum sulfate is a white crystalline solid that is commonly used in water treatment, as a coagulating agent to remove impurities and suspended solids from water. It is also used in the paper industry, in the production of dyes and pigments, and as a food additive. Aluminum sulfate has a variety of other applications as well, such as in the production of aluminum and in the tanning of leather.
The formula 3Al2(SO4)3 indicates that the compound contains three molecules of aluminum sulfate, with a total of six aluminum atoms and nine sulfate ions. Each aluminum sulfate molecule consists of two aluminum atoms and three sulfate ions.
Al atoms: 6, S atoms: 9, O atoms: 36, The total number of atoms is 51.
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2B.1 (b) When 178J of energy is supplied as heat to 1.9 mol of gas molecules,
the temperature of the sample increases by 1.78 K. Calculate the molar heat
capacities at constant volume and constant pressure of the gas.
The molar heat capacity at constant volume of the gas is 100 J/mol·K, and the molar heat capacity at constant pressure of the gas is 108.31 J/mol·K.
What is molar heat capacity?
Molar heat capacity, also known as specific heat capacity, is the amount of heat required to raise the temperature of one mole of a substance by one degree Celsius (or Kelvin). The molar heat capacity is expressed in units of joules per mole per kelvin (J/mol·K).
The molar heat capacities at constant volume (Cv) and constant pressure (Cp) can be calculated using the following equations:
Cv = ΔQ/ΔT (at constant volume)
Cp = ΔQ/ΔT (at constant pressure)
where ΔQ is the heat absorbed by the gas and ΔT is the change in temperature.
In this case, ΔQ = 178 J and ΔT = 1.78 K.
At constant volume, the heat absorbed by the gas will cause an increase in the internal energy of the gas, so only the Cv can be calculated.
Cv = ΔQ/ΔT = 178 J / 1.78 K = 100 J/mol·K
At constant pressure, the heat absorbed by the gas will cause an increase in both the internal energy and the pressure-volume work done by the gas, so Cp can be calculated. The relationship between Cp and Cv is given by:
Cp = Cv + R
where R is the universal gas constant (8.31 J/mol·K).
Cp = Cv + R = 100 J/mol·K + 8.31 J/mol·K = 108.31 J/mol·K
Therefore, the molar heat capacity at constant volume of the gas is 100 J/mol·K, and the molar heat capacity at constant pressure of the gas is 108.31 J/mol·K.
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Lab: Measuring pH Table or
Lab Report please ( just link it )
There are two ways to measure pH: calorimetrically with indicator fluids or sheets and electrochemically with electrodes and a millivoltmeter for greater accuracy (pH meter).
A pH lab report is what?The pH scale is used to indicate how basic or acidic a solution is (pH stands for potential of hydrogen). The pH scale gauges a substance's acidity or basicity. It falls between 0 and 14. Seven is the neutral pH.
How is pH calculated?The pH scale is a useful tool for illustrating how basic or acidic a solution is. By using the negative logarithm of the hydronium ion concentration, or pH = -log[H3O+], we may determine the pH of a solution.
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Answer: here’s mine :)
Given the following list from the activity se- ries of metals (from most active to least ac- tive) K, Na, Al, Mn, Cr, Cd, Co, Pb, Hg which reaction would you NOT expect to occur?
1. Na(s) + Mn2+(aq) → Na+(aq) + Mn(s)
2. Co2+(aq) + Al(s) → Al3+(aq) + Co(s)
3. Cd(s) + Pb2+(aq) → Pb(s) + Cd2+(aq)
4. Al3+(aq) + Cr(s) → Cr3+(aq) + Al(s)
5. All of the listed reactions will occur.
Answer:
Explanation:
According to the activity series of metals, the reaction that would not be expected to occur is:
Al3+(aq) + Cr(s) → Cr3+(aq) + Al(s)
This is because aluminum (Al) is higher on the activity series and is less likely to be oxidized (lose electrons), while chromium (Cr) is lower on the activity series and is more likely to be oxidized. In this reaction, aluminum would have to be oxidized, which is not consistent with its position on the activity series.
All of the other reactions listed are expected to occur because they involve the transfer of electrons from a metal that is lower on the activity series to a metal that is higher on the series.
