Two or more than two atoms with different physical or chemical properties can not combine together to form an element. Zinc is the element, that represents the given electronic configuration.
What is element?Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same.
In the given electron configuration [Ar]4s²3d¹⁰. Argon has 18 electrons. So, we have to add 12 electrons from s and d subshells to 18. The total number of electrons that we get on adding is 30. The element that corresponds to atomic number 30 is zinc that is Zn.
Therefore, Zinc is the element, that represents the given electronic configuration.
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An element from Group 13 bonds with an element from Group 17. Which formula correctly depicts the correct chemical formula for elements from these two groups?A AlCl3AlCl 3 B BFBF C BrGa3BrGa 3 D B3I
When metals and non metals combine in fixed proportion then a chemical compound is formed So, the compound that will be formed from group 13 elements and group 17 is AlCl₃.
What is chemical formula?
Chemical formula is a formula where cation and anion combine to form a molecule in fixed proportion. Metals combine in form of cation and non metals combine in form of anion.
Cation is the species that give electron and attain positive charge while anion is a species which gain electron and attains negative charge so when anion and cation combine in fixed ration the the overall charge of the molecule is zero that is molecule is neutral, the charge over cation and anion is also called oxidation state. the compound that will be formed from group 13 elements and group 17 is AlCl₃.
Therefore, the correct option is option A.
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you have a sample containing 4.5g of an unknown gas. Based on the volume, temperature, and pressure of the sample, there are 0.14 moles of gas present. What is the molar mass (g/mol) of the unknown gas? please explain step by step
The molar mass of the gas is obtained as 32.1 g/mol.
What is the molar mass?The molar mass has to do with the mass one mole of a substance. We know that according to the question, we can be able to obtain the number of moles of the compound from the ideal gas equation.
This is how we are able to get the number of moles of the gas as 0.14 moles. Now we need to use the information that we have to get the molar mass of the gass.
Number of moles = mass/ molar mass
Molar mass = mass/Number of moles
Molar mass = 4.5g/0.14 moles
= 32.1 g/mol
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What is the pH of a solution that is 0.21 M sodium fluoride and 0.57 M hydrofluoric acid?
From the Henderson- Hasselbalch equation, the pH of a solution is 3.36.
How can the pH of a solution made from a weak acid and its conjugate base be calculated?The pH of a solution made from a weak acid and its conjugate base can be calculated using the Henderson- Hasselbalch equation.
The Henderson- Hasselbalch equation is given below as follows:
pH = pKₐ + log ([A⁻]/[HA])where;
pKa = - log(Ka) of hydrofluoric acid[A⁻] = concentration of salt of conjugate base, NaF[HA] = concentration of hydrofluoric acidpKa of HF = 3.8
[A⁻] = 0.21 M
[HA] = 0.57 M
pH = 3.8 + log (0.21/0.57)
pH = 3.36
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How many grams of propane can combust at 25°C and 1.04 atm if reacting with 14.7 L of oxygen gas?
The volume of oxygen is 14.7 litres.
What is volume?
volume is a measure of occupied three dimensional space.
Sol-Balanced chemical reaction: C₃H₈ + 5O₂ → 3CO₂ + 4H₂O.
m(C₃H₈-propane) = 5.53 g.
n(C₃H₈) = m(C₃H₈) ÷ M(C₃H₈).
n(C₃H₈) = 5.53 g ÷ 44.1 g/mol.
n(C₃H₈) = 0.125 mol.
From chemical reaction: n(C₃H₈) : n(O₂) = 1 : 5.
n(O₂) = 0.625 mol.
T = 25° = 298.15K.
p = 1.04 atm.
R = 0.08206 L·atm/mol·K.
Ideal gas law: p·V = n·R·T .
V(O₂) = n·R·T / p.
V(O₂) = 0.625 mol · 0.08206 L·atm/mol·K · 298.15 K / 1.04 atm.
V(O₂) = 14.7 L.
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State the composition of the alloy to make rings
Explanation:
Write a short report describing your ideas for a school of the future. You can suggest changes to:
• school buildings and classrooms.
• the library
• the cafeteria
• how classes are taught.
Give a reason for each of your suggestions. Use a variety of synonyms and accurate vocabulary.
200 words only
Which force slows a skateboard when a skateboarder puts a foot down to brake?
O motion
O gravity
O friction
O inertia
Answer:
It is definitely friction
Which substance (Na, Mg, or Ca) do you identify with and why?
The metals known as Alkaline Earth metals are Na, Mg, or Ca. They are known as "alkaline" earth metals because when they interact with water, they produce "alkaline" hydroxides solutions.
How many metals made of alkaline earth exist?Any of the six chemical elements that make up Group 2 (II a) of the periodic table is an alkaline-earth metal. Beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium are the constituent elements (Ra).
What other names do alkaline earth metals go by?The alkaline earth oxides, formerly known as beryllia, magnesia, lime, strontium, and baryta, are what give the alkaline earth metals their name. These oxides turn basic when combined with water (alkaline).
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Communities often have disposal sites where people can safely dispose of medications, household cleaners and waste instead of pouring them down their sink drains.
How does this impact the environment?
reduces water pollution
reduces waste recycling
improves land conservation
reduces fossil fuel consumption
Having disposal sites where people can safely dispose of medications, household cleaners and waste instead of pouring them down their sink drains impacts the environment by reducing water pollution.
What is water pollution?
When chemicals contaminate water sources, the water in these water bodies becomes unsafe and harmful for use in drinking, cooking, cleaning, swimming, and other activities. This contamination of water bodies is called water pollution.Chemicals, waste, microorganisms, and parasites are examples of pollutants affecting the water bodies.Pouring chemicals down the drain poses the most immediate risk of water pollution. Chemicals are harmful for consumption by all living things when they are dumped down the drain because of the effects they have on our rivers, lakes, streams, and other water supplies.
In regions where contamination is happening, human health might suffer, which can cause serious health problems. Animals and plants that are given contaminated water get sick and die, which has an impact on agriculture as well.
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What is the atomic radius of Br?
84pm
140pm
60pm
117pm
Answer:
The answer is 117.
Explanation:
There’s not really a way to calculate atomic radius. It comes from empirical data and is in the periodic table. The only way I can think of is Bohr’s radius constant.
₀ = 4₀(ℎ bar)²/_e (_e)²
Calculating atomic radius can get complicated so it’s best to leave it at this.
Consider the reaction: A+B---->2C. If 0.80 moles of C are formed, how many moles of A have been consumed by the reaction?
Answer:
0.40 mole of A
Explanation:
1 mole of A to produce 2 moles of C
so the number of mole of A to produce 0.80 mole of C is:
(0.80 x 1)/(2) = 0.40 mole
Meghan is baking cookies. When she turns the oven on, she notices that the heating coils in the back of the oven start to glow orange. As she opens the oven to place the cookie sheet on the oven rack, she can feel the warmth from the oven. She watches the cookies puff up and turn a golden brown. Read the paragraph that describes energy as Meghan bakes. Choose the word that correctly completes each sentence. Baking cookies in the oven is an example of how energy is . Electrical energy is neither or . Thermal energy either from one object to another as it is transferred or into a different form as it is transformed.
1. Baking cookies in the oven is an example of how energy is conserved.
2. Electrical energy is neither transformed nor transferred.
3. Thermal energy either moves from one object to another as it is transferred or changes into a different form as it is transformed.
Baking is the process of cooking with dry heat, particularly in an oven. It is most likely the oldest type of cooking. Bakery goods including bread, rolls, cookies, pies, pastries, and muffins are typically made with flour or meal that comes from grains of some kind.
The stages of the ingredients originally start out in distinct states (e.g., flour is solid, eggs are liquid, etc.), and they change several times as the cookies bake. When they are combined to create cookie dough, a state known as a colloid results (like a mix between solid and liquid). Eventually, the cookies reach a solid state when baking is.
Thus, Baking cookies in the oven is an example of how energy is conserved . Electrical energy is neither transferred or transformed . Thermal energy either moves from one object to another as it is transferred or changes into a different form as it is transformed.
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23. When wood burns, only a small amount of ashes are made. We know that matter cannot be created or
destroyed. Explain why the mass of the wood before the fire does not equal the mass of the ashes after the
reaction.
for each
The mass of wood before burning does not always equal the mass of the resulting ashes after burning because some other products have been produced and lost.
Burning of woodWhen wood burns, a form of chemical change takes place and the reaction is reversible.
The products of wood burning include ashes, carbon dioxide, and water vapor. However, only ashes remain after burning because carbon dioxide and water vapor both escape into the atmosphere.
The escape of some of the products of burning into the atmosphere is one of the reasons the reaction seems to negate the law of conservation of mass.
According to the law of conservation of mass, masses are conserved during reactions but can be converted to different forms. Thus, if ashes were to be the only product of the burning of wood, then the mass of the ashes formed must be equivalent to the mass of the wood.
However, due to the formation of other products that happen to always escape into the air, the mass of ashes is not always equal to the mass of the woods that burn.
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What is unique about the orbitals around the nucleus of an atom?
Responses
Each orbital has its own set of neutrons.
Each orbital has its own set of neutrons.
Each orbital has electrons of a specific energy level.
Each orbital has electrons of a specific energy level.
Each orbital contain protons.
Each orbital contain protons.
Each orbital has only one electron.
The unique property of the orbitals around the nucleus of an atom is that each orbital has electrons of a specific energy level; option B.
What are orbitals in an atom?Orbitals in an atom are regions of space around which electrons are found in an atom.
The orbitals in an atom are also described as energy levels.
Electrons are arranged in atomic orbitals from orbitals having the lowest energy to orbitals having the greatest energy.
The outermost orbital of an atom is known as the valence orbital and electrons found there are known as valence electrons.
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A wave's frequency is 8.50x10^14 s-1. What is the wavelength?
Based on the given frequency of the wave, the wavelength of the wave is 3.75 * 10⁻⁷ m.
What is the relationship between the frequency and wavelength of a wave?The frequency of a wave is the number of complete oscillations performed by the wave per second.
The wavelength is the distance between successive points on the wave.
The relationship between the wavelength and frequency of a wave is given below:
Wavelength = velocity / frequency
Assuming the given wave is an electromagnetic wave, the velocity of the wave is 3.0 * 10⁸ m/s
Wavelength = 3.0 * 10⁸ m/s / 8.50 * 10¹⁴ s⁻¹
Wavelength = 3.75 * 10⁻⁷ m
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Hydrogenation of cholesterol
The molecular structure of the fat is changed when lipids like cholesterol are exposed to hydrogenation.
What is cholesterol?
Any member of the lipids class of specific chemical compounds is a kind of cholesterol. It is a sterol, a class of lipid (or modified steroid). All animal cells produce cholesterol, which is a crucial part of the membranes that make up those cells. It is a yellowish crystalline solid when chemically separated. It is possible to increase the saturation of fatty acids by adding hydrogen to unsaturated fatty acid chains, which connects the hydrogen atoms to the saturation sites.
Hence, the molecular structure of the fat is changed when lipids like cholesterol are exposed to hydrogenation.
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A sample of a concentrated hydrochloric acid is 11.8Molarity and has a density 1.19 gram per mili liter calculate the mass percentage of HCl?
The mass percentage of HCl 11,900x/118 g and molality of solution is 9.915 mol L^-1.
Molarity = 11.8 M
Molarity = (moles of HCl) / (litres of solution)
Molality = (moles of HCl) / (kilograms of solvent)
=> Let number of moles of HCl present be x moles.
So, 11.8 = x/litres of solution
litres of solution = x/11.8 litres.
So, volume in mL = x/11.8 * 1000 mL =>10,000x/118 mL
Density of solution = 1.19 g/ml
So, D = m/v
Mass of solution = D * v => 1.19 * 10,000x/118 => 11,900x/118 g
=> (11,900x/118)/1000 L => 11.9x/118 litres
Moles of HCl = x moles.
Molality = x/( 11.9x/118)
=> 118x/11.9x => 118/11.9 => 9.9156 mol L-1
=> Molality of solution = 9.915 mol L-1 (approx.)
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Which of the following is involved in bonding between atoms?
Select one:
O a. neutrons
O b. protons
O c. electrons
O d. the nucleus
The following is involved in bonding between atoms is electron
There are four type of chemical bonds essential for life to exist and it is ionic bond, covalent bond, hydrogen bond, and Vander wall interaction and all of these are different kind of bond to play various role in biochemical interaction and the electron on the outermost energy level of the atom are called valence electron and the valence electron are involved in bonding one atom yo another
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Acetylsalicylic acid, C9H8O4, is the pain reliever in many
headache medications. A typical tablet contains 250.0 mg
of acetylsalicylic acid.
(a) Calculate the amount of acetylsalicylic acid in the tablet.
(b) Calculate the number of hydrogen atoms in the amount
of acetylsalicylic acid in the tablet determined in (a).
The amount of acetylsalicylic acid in the tablet is 0.001389 moles and the number of hydrogen atoms in the amount of acetylsalicylic acid in the tablet is 6.69 × 10²¹.
(a)
The formula of acetylsalicylic acid is C₉H₈O₄.
Molar mass of C₉H₈O₄ = 9 × atomic mass of C + 8 × atomic mass of H + 4 × atomic mass of O
= 9 × 12 + 8 × 1 + 4 × 16
= 108 + 8 + 64
= 180
No of moles of acetylsalicylic acid = Given mass / molar mass
= 0.25 / 180
= 0.001389
Hence, the number of moles of acetylsalicylic acid is 0.001389 moles.
(b)
Number of hydrogen atoms present in 1 mole of acetylsalicylic acid = 6.023 × 10²³ atoms
Number of hydrogen atom present in 0.001389 moles of acetylsalicylic acid = 0.001389 × 6.023 × 10²³ = 0.008365 = 8.36 × 10²⁰ atoms.
Now there are 8 hydrogen atoms in acetylsalicylic acid so,
Number of atoms of hydrogen in acetylsalicylic acid = 8 × 8.36 × 10²⁰ atoms = 6.69 × 10²¹ atoms.
Hence, the number of atoms of hydrogen in 0.001389 moles of acetylsalicylic acid is 6.69 × 10²¹ atoms.
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How much heat is released when an acetylene (C2H2) torch burns 250 grams of fuel? (ΔH of combustion for acetylene = -1300 kJ/mol)
Select one:
135 kJ
32500 kJ
12500kJ
5.2 kJ
12500 joule heat is released when an acetylene (C2H2) torch burns 250 grams of fuel
q=ΔnH
H acetylene = -1300 kJ/mo
n=given mass/molar mass
given mass= 250 g
molar mass=26
n= 250/26
n=9.61
q=ΔnH
q=9.61× -1300 kJ/mo
q=-12500 joule
In thermodynamics, heat has a very specific definition that is different from how we generally use the word. When two systems with various surface temperatures come into touch with one another, heat is the thermal energy that is transferred. The letters q or Q stand for heat, which is measured in joules.
Heat is sometimes referred to as a process quantity since it is defined in the context of a process through which energy can be conveyed. We may talk about the heat that a hot cup of coffee imparts to your hand, but we don't talk about the heat that a cup of coffee itself holds. Heat is yet another noteworthy quality.
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Which of the following is the correct formula to calculate percent by mass? [Mass of solution (g) + mass of solute (g)] × 100 [Mass of solute (g) − mass of solution (g)] × 100 [Mass of solute (g) ÷ mass of solution (g)] × 100 [Mass of solution (g) ÷ mass of solute (g)] × 100
Considering the definition of percent by mass, the correct answer is the third option: the correct formula to calculate percent by mass is [Mass of solute (g) ÷ mass of solution (g)] × 100
Definition of percent by massThe percent by mass is a measure of the amount of mass that an element occupies in a compound and it is defined as the ratio of the mass of the solute to the mass of the solution, expressed as a percentage.
To calculate the percentage of composition, it is necessary to know the mass of the element in a known mass of the compound.
So, the percent by mass is calculated as the mass of the solute divided by the mass of the solution, the result of which is multiplied by 100 to give a percentage:
percent by mass= [Mass of solute (g) ÷ mass of solution (g)] × 100
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What is the specific heat of a 95.01 g piece of an unknown metal that exhibits a 45.2°C temperature change upon absorbing 1870 J of heat?
The specific heat of a 95.01 g piece of an unknown metal that exhibits a 45.2°C temperature change upon absorbing 1870 J of heat is 0.44J/g°C.
How to calculate specific heat?The specific heat capacity of a metal can be calculated using the following:
Q = mc∆T
Where;
Q = quantity of heat absorbed or released (J)m = mass of substance (g)c = specific heat capacity∆T = change in temperature (°C)According to this question, a 95.01 g piece of an unknown metal exhibits a 45.2°C temperature change upon absorbing 1870 J of heat. The specific heat capacity can be calculated as follows:
1870 = 95.01 × c × 45.2
1870 = 4294.452c
c = 0.44J/g°C
Therefore, 0.44J/g°C is the specific heat capacity of the metal.
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nasa measured the frequency of a cosmic ray emission to be 2.3 x 10^24 Hz. what is the wavelength in nm of this cosmic ray
The wavelength of the cosmic ray when the frequency is 2.3 x 10^24 Hz is 1.304 x 10^-7 nm.
What is wavelength?
Wavelength in a wave is the distance between any given point on a wave and the same point on the adjacent wave that is crest to crest or trough to trough. It can be measured in the direction of the given wave.
The wavelength in nm of the cosmic ray can be calculated as,
λ = c / ν
where λ is the wavelength, ν is frequency in Hz or s^-1 and c is velocity of light.
λ = (3 x 10^8 m/s) / 2.3 x 10^24 Hz = 1.304 x 10^-16 m = 1.304 x 10^-7 nm.
Therefore, the wavelength of the cosmic ray when the frequency is 2.3 x 10^24 Hz is 1.304 x 10^-7 nm.
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What volume of does 1.24grams of flourine gas occupy under conditions of 5.20 celcius and 2.04atm?
Volume the fluorine gas occupies = 0.73L
What is volume of a gas ?
The gas's volume:
The area occupied by gaseous particles under normal temperature and pressure circumstances is referred to as the volume of gas.
It is identified as a "V."
The letter "L" stands for "liters," the SI unit of volume.
At normal temperature, a mole of gas has a volume of 24 m3, or 24 000 cm3.
The molar volume of a gas is the name given to this quantity.
The gas equation
PV = n R T
P = pressure = 2.04 atm
T = temperature = 5.20 Celsius = 278.20K
V = volume
n = no of moles = 1.24/19 = 0.065moles
R = gas constant = 0.0821lit atm /K
V = 0.065*0.082*278.20/ 2.04 = 0.73L
Volume the fluorine gas occupies = 0.73L
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what is the limiting agent in 3 C2H3O2H + Al(OH)3
To solve such this we must know the concept of chemical reaction and concept of limiting agent. Therefore, C[tex]_2[/tex]H[tex]_3[/tex]O[tex]_2[/tex]H is limiting agent in the given balanced equation.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
The balanced reaction is
3 C[tex]_2[/tex]H[tex]_3[/tex]O[tex]_2[/tex]H + Al(OH)[tex]_3[/tex][tex]\rightarrow[/tex]
The limiting reagent depends on the mole ratio and not on the masses of the reactants present. 1 mole of Al(OH)[tex]_3[/tex] need 3 moles of 3 C[tex]_2[/tex]H[tex]_3[/tex]O[tex]_2[/tex]H. So, C[tex]_2[/tex]H[tex]_3[/tex]O[tex]_2[/tex]H is limiting reagent.
Therefore, C[tex]_2[/tex]H[tex]_3[/tex]O[tex]_2[/tex]H is limiting reagent.
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18.00 g hydrated magnesium
sulfate is heated to drive off the
water, leaving 9.211 g MgSO4 solid.
What is the formula of the hydrate?
The formula of the hydrate would be [tex]MgSO_4.6H_2O[/tex].
Deducing the formula of a hydrate saltIn order to get the formula of the hydrated salt, the empirical formula method can be used to know the mole of the salt and that of the water.
The formula of magnesium sulfate = [tex]MgSO_4[/tex]
The formula of water = [tex]H_2O[/tex]
Mass of hydrated magnesium sulfate = 18.00 g
Mass of anhydrous magnesium salt = 9.211g
Mass of water = 18 - 9.211
= 8.789 g
Now, let's find the mole equivalent of each component:
Molar mass of magnesium sulfate = 120.366 a/mol
Molar mass of water = 18.01 g/mol
Mole of magnesium sulfate anhydrous = 9.211/120.366
= 0.0765 mole
Mole of water = 8.789/18.01
= 0.4880 mole
Now, let's divide by the lowest mole:
Magnesium sulfate = 0.0765/0.0765
= 1
Water = 0.4880/0.0765
= 6.37
Thus, the mole ratio of magnesium sulfate and water of hydrate is 6 to 1. Therefore, the formula of the hydrated salt would be [tex]MgSO_4.6H_2O[/tex].
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What is the physical state of caesium at 25 degrees?
Answer:
298k
Explanation:
because 298k is lower than 302k
What would 5 carbons, 3 chlorine group side chains, and one propyl group side chain look like?
The structure of the compound that have been described in the question is shown in the image attached to this answer.
What is the structure?We know that in organic chemistry, the structure of a molecule is very instrumental to the way that the molecule would be able to undergo reaction. In this case, we have a compound that is said to have 5 carbons, 3 chlorine group side chains, and one propyl group side chain.
Our key task is first to visualize the molecule and they try to create the structure of the molecule. As we try to create the structure of the molecule, we must have in mind the tetravalence of carbon. That is, carbon can only form four bonds to itself.
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The preexponential and activation energy for the diffusion of iron in cobalt are 1.1 × 10−5 m2/s and 253,300 J/mol, respectively. At what temperature will the diffusion coefficient have a value of 2.1 × 10−14 m2/s?
The temperature is obtained as 1517 K.
What is the temperature?We know that we asked here to find the temperature at which we are going to have a diffusion coefficient of 2.1 × 10−14 m2/s. Let us look at the following from the question;
D = diffusion coefficient = 2.1 × 10−14 m2/s
[tex]D_{o}[/tex] = pre-exponential constant = 1.1 × 10−5 m2/s
[tex]E_{a}[/tex] = Activation energy = 253,300 J/mol
R = Gas constant = 8.314 J/mol.K
T = temperature = ??
Then;
log D= log [tex]D_{o}[/tex] - Ea/2.303RT
log(2.1 × 10−14) = log( 1.1 × 10−5) - 253,300/2.303 * 8.314 * T
log(2.1 × 10−14) / log( 1.1 × 10−5) = - 253,300/2.303 * 8.314 * T
T = - 253,300/-8.719 * 2.303 * 8.314
T= 1517 K
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An ideal gas sample has a certain volume at 350 K and 1 atm. The volume of the
same sample at STP will be closest to the volume at 350 K and 1 atm multiplied by:
A. 350/273
B. 350/298
C. 298/350
D. 273/350
From the general gas equation, the volume of the same sample of gas at STP will be closest to the volume at 350 K and 1 atm multiplied by 273/350; option D.
What is the relationship between the volume, temperature, and pressure of a gas?The relationship between the volume, temperature, and pressure of a gas is given by the general gas equation below:
P₁V₁ / T₁ = P₂V₂ / T₂
Where;
P₁ = initial pressure
V₁ = initial volume
T₁ = initial temperature
P₂ = final pressure
V₂ = final volume
T₂ = final temperature
Solving for V₂;
V₂ = P₁V₁T₂ / P₂T₁
V₂ = 350 * 1 * 273/350
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What is the equilibrium constant K at 25 °C for an electrochemical cell when E° = +0.0165 V and n = 2?(F = 96,500 J/(V･mol), R = 8.314 J/(mol･K))
The equilibrium constant K of the electrochemical cell is 2.976.
What is equilibrium constant ?The equilibrium constant of a chemical reaction is described as the value of its reaction quotient at chemical equilibrium, a state approached by a dynamic chemical system after sufficient time has elapsed at which its composition has no measurable tendency towards further change.
We have that:
ΔG = -nFE°cell
n = 2
Force value = 96,500 J/(V･mol)
E°cell = +0.0140 V
ΔG = -(2 * 96,500 * 0.0140)
ΔG = -2702 J
Then,
But;
ΔG = -R TlnK
lnK = -(ΔG/RT)
The value of K = e^[-(ΔG/RT))
The value of K = e^[-(( -2702)/8.314 * 298]
The value of K = 2.976
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