a) phosphorus atom - This would have three concentric circles with the outermost circle having five electrons.
b) chlorine ion - This would have three concentric circles with the outermost circle having seven electrons.
c) beryllium atom - This would have two concentric circles with the outermost circle having two electrons
d) calcium ion - This would have four concentric circles with the outermost circle having two electrons.
What is the Lewis dot diagram?We know that the Lewis dot diagram is the kind of representation that can be used to show the number of the electrons that we do have in an element. The number of atoms are shown in electrons that are in the orbits and the orbits are concentric circles that look very similar.
Recall that the orbits that we have in the atom are known to be arranged in energy levels and the energy levels of the atoms of the atoms of the elements play a key role in the Lewis dot structure of the elements that we know.
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Calculate to the correct number of significant figure (1.7x10^6)/(2.63x10^2) + 7.33 =
Answer: 64.7 [tex]*10^2[/tex]
Explanation:
Significant figures are the number of digits in a value that correlate with the accuracy of that value.
First lets solve the equation:
(1.7x10^6)/(2.63x10^2) + 7.33 = ?
(1,700,000)/(263) + 7.33
(6,463.8783) + 7.33 = 6,471.2083
We have to simplify the answer to the correct amount of significant digits.
6,471.2083 -> 64.7 [tex]*10^2[/tex]
Contains 8.2 mol of oxygen and 8.22 mol of lead
The mole fraction of oxygen in the cylinder, given that the cylinder contains 8.2 moles of oxygen and 8.22 moles of lead is 0.499
How do I determine the mole fraction of oxygen?Mole fraction is simply defined as:
Mole fraction of subtance = Mole of sunstance / total mole
Next, we shall determine the total mole in the cylinder. Details below:
Mole of oxygen = 8.22 moles Mole of lead = 8.22 molesTotal mole = ?Total mole = Mole of oxygen + mole of lead
Total mole = 8.2 + 8.22
Total mole = 16.42 moles
Finally, we shall determine the mole fraction of oxygen in the cylinder. Details below:
Mole of oxygen = 8.22 moles Total mole = 16.42 molesMole fraction of oxygen =?Mole fraction of oxygen = mole of oxygen / Total mole
Mole fraction of oxygen = 8.2 / 16.42
Mole fraction of oxygen = 0.499
Thus, we can conclude from the calcultions made above that the mole fraction of oxygen is 0.499
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Complete question:
A cylinder contains 8.2 mol of oxygen and 8.22 mol of lead. What is the mole fraction of oxygen in the cylinder?
EARTH SCIENCE
Drag and drop the words into the correct locations.(2 points)
Two astronomers accidentally discovered______, which is evidence of universe expansion that supports the Big Bang theory. This is particularly strong evidence because its temperature is ______. By observing this today, we can see what the universe looked like______?
Background radiation
137,000,000 years ago
not uniform
uniform
13,700,000,000 years ago
SOMEONE PLEASE HELP ME!!...
Accidental cosmic background radiation, remarkably uniform, billions of years ago.
what is radiation ?
Radiation is a form of energy that is emitted in the form of waves or particles. It is an invisible form of energy that travels through space. Radiation is present everywhere in the environment and is emitted from many sources, both natural and man-made.
Natural sources of radiation include the sun, rocks, soil, and the air. Man-made sources include nuclear power plants, medical devices, and X-ray machines. There are several forms of radiation including alpha, beta, and gamma radiation. Alpha radiation is made up of particles, while beta and gamma radiation consists of electromagnetic waves. Different types of radiation have different properties that make them useful in various applications. For example, gamma radiation is used in medical imaging.
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Q₁ differenciate using suitable examples between atomic number It's atomic mass of an element
Answer:
A measure of an element's identity is determined by its atomic number, and its weight is determined by its atomic mass.
Explanation:
The amount of protons in the nucleus of an element's atom is known as the element's atomic number. It serves to identify and categorize the elements in the periodic table and is particular to each element. The chemical characteristics of an element are determined by its atomic number.
An element's atomic mass is its average atom's mass, which is typically expressed in atomic mass units (amu). It is the total number of protons and neutrons in the nucleus of an atom. The atomic mass can be a decimal and is not always a number.
A measure of an element's identity is determined by its atomic number, and its weight is determined by its atomic mass.
For a diffraction grating with 1600 blazes/mm, what wavelength would you get for an angle of incidence of 30 degrees and reflection angle of 7 degrees? Assume first order diffraction.
The wavelength you get for an angle of incidence of 30 degrees and reflection angle of 7 degrees is
2.3633166* 10^{-4}mm
What is wavelength?Generally, To calculate the wavelength, you would need to use the equation for diffraction grating:
mλ = d(sin θi - sin θr)
Where
m is the order of diffraction (in this case, first order, so m=1), λ is the wavelength, d is the distance between the grating lines (in this case, 1600 lines/mm), θi is the angle of incidence, and 'θr is the angle of reflection.Plugging in the given values:
1λ = (1/1600 mm)(sin 30° - sin 7°)
Solving for λ:
λ = (1/1600 mm)(sin 30° - sin 7°)
λ = 2.3633166* 10^{-4}mm
This equation gives you the wavelength in the first-order diffraction
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If 8.2 moles of Mg are burned, how many moles of O2 are consumed?
If 8.2 moles of Mg are burned, the number of moles of O₂ consumed is 4.1 moles.
How to calculate moles using stoichiometry?Stoichiometry refers to the quantitative relationship between the reactants and products of a specific reaction or equation.
According to this question, magnesium reacts with oxygen to produce magnesium oxide as follows:
2Mg + O₂ → 2MgO
Based on the above equation, 2 moles of magnesium reacts with 1 mole of oxygen gas
This means that 8.2 moles of magnesium will react with 8.2 × ½ = 4.1 moles of oxygen gas.
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The measurement of 5342nm is the same length as _____ cm in scientific notation?
Answer:
Explanation:
5.342 x 10 the power of 7
What chemicals have a saturation concentration less than 5 but greater than 2
Saturation concentration refers to the highest concentration of a substance that can exist in a solution in equilibrium with its solid or gaseous form. A saturation concentration less than 5 but greater than 2 is a relatively broad range, and many different chemicals could fall within this range depending on the conditions of the solution.
Examples of chemicals with saturation concentration less than 5 but greater than 2 include:
Calcium carbonate, which has a saturation concentration of around 3.5 g/L at room temperature and normal pressure
Iron(III) hydroxide, which has a saturation concentration of around 3.5 g/L at room temperature and normal pressure
Potassium chloride, which has a saturation concentration of around 3.5 g/L at room temperature and normal pressure
Ammonium chloride, which has a saturation concentration of around 2.5 g/L at room temperature and normal pressure
Sodium sulfate, which has a saturation concentration of around 3.5 g/L at room temperature and normal pressure
It's important to note that these are just examples, the saturation concentration of a chemical can vary depending on temperature, pressure, and other factors.
If CCL4 contain 9.903g what is the mass percentage of carbon in the compound
The mass percentage of C is 7.8 %
What do you mean by mass percentage?The method for expressing a concentration is known as mass percent. The solution components of a given solution can be defined by the mass percentage.
The molar mass of CCL4 is carbon 12.0107g + 4*chlorine 35.453g = 153.823g.
The number of moles of carbon in CCL4 can be found by dividing the mass of carbon (12.0107g) by the molar mass of carbon (12.0107g/mol).
The mass percentage of carbon in CCL4 can be found by multiplying the number of moles of carbon by the molar mass of CCL4 and dividing by the total mass of CCL4, then multiplying by 100.
So, mass percentage of C = (12.0107g / 153.823g) * 100 = 7.8 %
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A 3.5-L sample of helium gas, collected at 0.00°C and 1.00 atm, is compressed into a 0.50-L cylinder. What pressure will the gas exert in the cylinder at 39.1°C?
The pressure of a gas is directly proportional to its temperature and inversely proportional to its volume.
PV/T = PV/T
(1.00atm * 3.5 L)/ 273k = (P * 0.50L)/(39.1 + 273k)
Do some simple algebra and you will get
P = 8.0 (Note that there should be 2 sigfigs)
If you fill your car tire to a pressure of 33 psi (pounds per square inch) on a hot summer day when the temperature is 35 ∘C (95 ∘F ), what is the pressure (in psi ) on a cold winter day when the temperature is − 17 ∘C (1 ∘F )? Assume no gas leaks out between measurements and the volume of the tire does not change.
The pressure on a cold winter day would be 16.03 psi.
Pressure lawThe pressure law state that the pressure of a gas at constant volume is directly proportional to its temperature. This law can be mathematically expressed as follows:
[tex]P_1/T_1 = P_2/T_2[/tex]
Where [tex]P_1[/tex] = initial pressure of the gas, [tex]T_1[/tex] = initial temperature, [tex]P_2[/tex] = final pressure, and [tex]T_2[/tex] = final temperature.
In this case, [tex]P_1[/tex] = 33 psi, [tex]T_1[/tex] = 35 [tex]^oC[/tex] and [tex]T_2[/tex] = -17 [tex]^oC[/tex]. What we are looking for is [tex]P_2[/tex].
[tex]P_2[/tex] = [tex]P_1.T_2/T_1[/tex]
= 33 x -17/35
= 16.03 psi
In other words, at constant volume and without leakage, the pressure in the tire on a cold winter day when the temperature is -17 [tex]^oC[/tex] would be 16.03 psi.
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Which of the following statements about substances X and Y are true? Assume ideal behavior.
Choose one or more:
A. Y is the solvent in this solution.
B. The presence of Y in the solution lowers the vapor pressure of X.
C. If Y were not present, there would be more X particles in the gas above the liquid solution.
D. Pure Y has a higher vapor pressure than pure X.
The statements about substances X and Y are true are Y is the solvent in this solution, The presence of Y in the solution lowers the vapor pressure of X and if Y were not present, there would be more X particles in the gas above the liquid solution. Therefore, option A, B and C are correct.
What is the solution ?A mixture in which one substance dissolves in the other is called a solution. The solute is the substance that dissolves. The solvent is the substance that does not dissolve. Salt water is an example of a solution.
In a mixture called a solution, every component is well combined. Solutions can contain solids, liquids, and gases and are regarded as homogenous mixes. A solute and a solvent makeup a solution. Any substance that dissolves in a solvent is referred to as a solute.
Thus, option A, B and C are correct.
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Calculate the vapor pressure at 85.0°C of a solution prepared by dissolving 0.300 mol of liquid dibromoethane (C₂H4Br₂, Pº=127 torr)
in 1.80 mol of liquid dibromopropane (C3H6Br2, P=173 torr).
torr
The vapor pressure at 85.0°C of a solution prepared by dissolving 0.300 mol of liquid dibromoethane the vapor pressure at 85.0°C of a solution prepared by dissolving 0.300 mol of liquid dibromoethane is 164.83 torr.
What is vapor pressure ?The term vapor pressure is defined as the tendency of a material to change into the vapour state, and it increases with temperature.
For calculating mole fraction of C₂H₄Br₂ as follows
X C₂H₄Br₂ = moles of C₂H₄Br₂ / moles of C₂H₄Br₂ + moles of C₃H₆Br₂
= 0.3 / 0.3 + 1.80
= 0.14
For calculating mole fraction of C₃H₆Br₂ as follows:
XC₃H₆Br₂ = moles of C₃H₆Br₂ / moles of C₂H₄Br₂ + moles of C₃H₆Br₂
= 1.80 / 2.1
= 0.85
For calculating total vapor pressure as follows:
P total = [ ( 0.14 × 127) + (0.85 × 173) ]
= 17.78 + 147.05
= 164.83 torr
Thus, The vapor pressure at 85.0°C of a solution prepared by dissolving 0.300 mol of liquid dibromoethane the vapor pressure at 85.0°C of a solution prepared by dissolving 0.300 mol of liquid dibromoethane is 164.83 torr.
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The psychological response to aging is negatively influenced by what
Answer:
isolation, loneliness or psychological distress
Explanation:
In addition, older people are more likely to experience events such as bereavement, or a drop in socioeconomic status with retirement. Sadly these stressors can result in isolation, loneliness or psychological distress in older people. Mental health has an impact on physical health and vice versa.
Please help I need help solving this IUPAC name for the compound shown here.
IUPAC named for the compound shown here is 1- hydroxyl, 3- ethyl, hexane.
What is IUPAC system ?The International Union of Pure and Applied Chemistry is full form of IUPAC. It is important because it creates a standardized way to name chemical compounds in organic chemistry.
The International Union of Pure and Applied Chemistry recommends using the IUPAC nomenclature of organic chemistry to name organic chemical substances.
The rule of the first point of difference states that the series that includes the lowest number when the first difference occurs is the "lowest."
Thus, IUPAC named for the compound shown here is 1- hydroxyl, 3- ethyl, hexane.
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Calculate to the correct number of significant figures (85.3-21.489)/0.0059
Answer:
11000
Explanation:
85.3 has 3 significant figures
21.489 has 5 significant figures
0.0059 has 2 significant figures ( as zeros on the left are not significant)
The answer is always rounded off to the least number of decimal places given in the question. Here the least number is two significant figures.
Therefore;
(85.3 - 21.489)/0.0059
= (63.811)/0.0059
= 10815.42
As we have to round off the answer to two significant figures:
= 11000
Suppose a beaker of orthoxylene is put inside a sealed tank containing orthoxylene gas at 142. degree C and 893. torr. After ten minutes, will there be more liquid in the beaker, less liquid, or the same amount?
The beaker of orthoxylene was put inside a sealed tank containing orthoxylene gas at 142. degree C and 893. torr will have the same amount of liquid inside it after ten minutes because the system is a closed system as none of the liquid's vapor escapes.
The correct option is the same amount.
A closed system allows energy to enter and exit but not matter to enter or exit. About a closed system is a covered pot on the burner. Both matter and energy cannot enter or leave an isolated system. A thermos or cooler is about as isolated a system as there is.
The beaker of orthoxylene that was put inside a sealed tank containing orthoxylene gas at 142 degrees C and 893 torr is a closed system.
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What is the density of 10.002 g of water at 20°C in the units of g/mL?
Answer:
the density of 10.002 g of water at 20°C in the units of g/mL is 0.998 g/mL
Explanation:
Density of 10.002g of water at 20°C in g/mL = 0.998 g/mL
Given that:
density of water at 20°C = 0.9982 g/mL
Density = mass / volume ---- ( 1 )
Where : mass = 10.002 g
Volume = ?
Density = 0.9982 g/mL
∴ Volume = 10.002 / 0.9982 = 10.02 mL
back to equation ( 1 )
Density = 10.002 / 10.02 = 0.9982 g/mL ≈ 0.998 g/mL
How to name the compound N2O3 (2 and 3 are subscripts, O is the letter). List the steps.
Answer:
Explanation:
1. Identify the elements present in the compound. The compound N2O3 contains two elements: nitrogen (N) and oxygen (O).
2. Determine the type of compound. N2O3 is an ionic compound, as it contains two different elements.
3. Write out the full name of the compound. The full name of the compound is dinitrogen trioxide.
4. Identify the subscripts. The subscripts indicate the number of atoms of each element in the compound. In this case, there are two nitrogen atoms (N2) and three oxygen atoms (O3).
5. Assign the proper name. The proper name for N2O3 is dinitrogen trioxide.
Write a scientific explanation that describes if we should use synthetic materials or only natural materials.
please help by the end of the night
We should be using natural materials because they are safer for our environment.
Why natural materials are preferableClaims: We should be using natural materials as opposed to synthetic materials. This is because natural materials are organic and 100% biodegradable. Synthetic materials, on the other hand, are not all naturally biodegradable. Many of them persist in the environment and hurt the environment and living organisms in the process.
Evidence: Most nylons and plastics are good examples of synthetic materials. Both are not biodegradable and persist in the environment. Our oceans are filled with nondegradable plastics. This plastic pollution is a threat to water transportation, aquatic biodiversity and food sustainability of humans.
Reasoning: Most synthetic materials affect the environment and we humans as compared to natural materials who are easily removed from the environment. Thus, our preference should be natural materials.
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Order from Weakest attraction to strongest attraction
YC13
SrCl2
RbCl
Order from the weakest attraction to the strongest attraction is SrCl₂ > RbCl > YCl₃.
Which type of attraction is the weakest ?The London dispersion forces are the least powerful intermolecular forces. London's dispersion forces are also referred to as induced-dipole-induced-dipole because they are transiently attractive forces that cause temporary dipoles to form.
The non-polar, monatomic gas exhibits London dispersion.Ionic bonds > Hydrogen bonding > Van der Waals dipole-dipole interactions > Van der Waals dispersion forces.
The attraction of hydrogen bond is strongest, because they have permanent dipole-dipole forces, Van der Waal's forces is the weakest bond of attraction.
Thus, the order from the weakest attraction to the strongest attraction is SrCl₂ > RbCl > YCl₃.
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A 0.04373 g sample of gas occupies 10.0 mL at 291.0 K
and 1.10 atm. Upon further analysis, the compound is found to be 25.305% C
and 74.695% Cl.
What is the molecular formula of the compound?
The molecular formula of the compound is C₂Cl₂.
The empirical formula of a chemical compound is the smallest ratio of elements present in the compound. From the analysis
Percentage of C = %C = 25.305% Percentage of Cl = %Cl = 74.695% Atomic massCalculate the number of moles of the compound using the ideal gas equation P × V = n × R × T
n = number of moles (mol) T = temperature = 291.0 K R = gas constant = 0.0821 L atm /mol KP = pressure = 1.10 atmV = volume = 10.0 mL = (10.0 ÷ 1,000) L = 0.01 LP × V = n × R × T
1.10 × 0.01 = n × 0.0821 × 291.0
0.011 = n × 23.8911
n = 0.011 ÷ 23.8911
n = 4.6 × 10⁻⁴ mol
Calculate the molecular mass using Stoichiometry n = m ÷ M
m = mass = 0.04373 g M = molecular mass (g/mol)n = number of moles = 4.6 × 10⁻⁴ molM = m ÷ n
M = 0.04373 ÷ (4.6 × 10⁻⁴)
M = 95.0 g/mol
The molecular mass for the compound equals the molecular mass from the empirical formula times n.
M = M ((CCl)ₙ)
95.0 = (12 + 35.5) × n
95.0 = 47.5 × n
n = 95.0 ÷ 47.5
n = 2.1
n ≈ 2
The molecular formula times 2 from the empirical formula C₂Cl₂
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Please help me with this question (Chemistry -- Stoichiometry)
The mass in grams of water that are produced when 80. g of NaOH react with 73 g of HCl to form 117 g of NaCl and water is 36.0 g.
What is the equation of the reactions of sodium hydroxide and hydrochloric acid?The equation of the reactions of sodium hydroxide and hydrochloric acid is given below:
NaOH + HCl ---> NaCl + H₂O
The mole ratio is 1 : 1 : 1 : 1
Moles of NaOH that reacted = 80/40
Moles of NaOH that reacted = 2 moles
Moles of HCl that reacted = 73/36.5
Moles of HCl that reacted = 2 moles
Moles of water produced will be 2 moles
Mass of water = 2 * 18 g/mol
Mass of water produced = 36.0 grams.
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tailoring binding abilities by incorporating oxophilic transition metals on 3d nanostructured ni arrays for accelerated alkaline hydrogen evolution reaction
The Cr-incorporated Ni catalyst shows optimized OH-binding as well as H-binding energies for facilitating water dissociation and improving HER activity in alkaline media.
Developing efficient and inexpensive electro catalysts for the hydrogen evolution reaction (HER) in alkaline water electrolysis plays a key role in renewable hydrogen energy technology.
The trends in HER activity with respect to the binding energies of Ni-based thin film catalysts by incorporating a series of oxophilic transition metal atoms. It was found that the doping of oxophilic atoms enables the modulation of binding abilities of hydrogen and hydroxyl ions on the Ni surfaces, leading to the first establishment of a volcano relation between OH-binding energies and alkaline HER activities.
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An unknown gas effuses at a rate 1.50 times the rate of COCl₂. What is the molar mass of the unknown gas?
Answer:
The molar mass of an unknown gas can be determined using the concept of effusion. Effusion is the process of a gas passing through a small hole or porous partition. The rate of effusion of a gas is inversely proportional to the square root of its molar mass. This relationship is described by the Graham's law of effusion.
Explanation:
Graham's law of effusion states that the rate of effusion of a gas is inversely proportional to the square root of its molar mass.
R = k √M
Where R is the rate of effusion, k is a constant, and M is the molar mass of the gas.
If we know the rate of effusion of COCl2 and the rate of effusion of an unknown gas and we know that the unknown gas effuses at a rate 1.5 times the rate of COCl2.
R unknown = 1.5 * R COCl2
We can use this information to find the molar mass of the unknown gas.
M = (R COCl2 / (1.5 * R unknown) )²
If we know the molar mass of COCl2, we can substitute it in the equation and solve for the molar mass of the unknown gas.
It's worth noting that this problem requires you to know the molar mass of COCl2 which is not provided in the question. And also it's important to know that the values of the constant k in the equation for the different gases are not the same, so you need to use the same gas as reference.
Can anyone help me on balancing equations?
Answer:In (a). 1st blank will be 1
2nd blank will be 4
3rd blank will be 3
(b).1-1
2-3
3-1
4-2
(c).1-1
2-12
3-12
4-11
(d).1-2
2-3
3-2
4-4
Explanation:
What volume of O2 at 988 mmHg and 37 degrees C is required to synthesize 19.5
of NO?
Explanation:
The volume of O2 at 988 is 0.1634°C
Oxide of the trivalent element contains 31.58% oxygen
Calculate the equivalent, molar and atomic masses of this
element.
Answer:
In X2O3,. Percentage of oxygen by weight = 31.58. Percentage of X by weight = 68.42. Let the atomic weight of X = x. 2x+482x×100 = 68.42. ∴ x = 51.99.
Explanation/solution in image
Group 1 metals are explosive when they come into contact with water. If 20.0 grams of potassium were to explode with excess water, how many moles of hydrogen would be produced?
Two moles or 78 g of potassium metal reacts with water to give one mole or 2 grams of hydrogen gas. Then 20 g of K will give 0.51 g of hydrogen gas.
What are metal hydroxides?Metals especially alkali metals and alkaline earth metals are highly reactive towards air and water. By reacting with water these metals produces their corresponding hydroxides.
Potassium reacts with water forms KOH as written below:
[tex]\rm 2K + 2H_{2}O \rightarrow 2 KOH + H_{2}[/tex]
As per this reaction, 2 moles of K produces 1 mole of hydrogen
atomic mass of K = 39 g/mol
mass of 2 K = 78 g
mass of H₂ = 2g
Then mass of H₂ produced from 20 g of K is:
mass of H₂ = (20 × 2) /78 = 0.51 g
Therefore, 0.51 g of hydrogen gas is produced by 20 grams of potassium metal.
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Solution A has a pH of 10 and solution B has a pH of 6. Solution A has _____ times less hydrogen ion compared with solution B.
Answer:
_4
Explanation:
according to how the ph scale is arranged ,you will notice that when tou move from ph 10 to ph 6 the form changes to negative and it will give the answer as _4
