Answer:
Correct option is C)
Kinetic Energy at 20
o
C=293K
=3/2K
B
T=3/2K
B
(293)J=K.E
1
kE
2
=2K.E
1
2
2
3
K
^
B
(293)=
2
3
K
^
B
T
T=586K
=313
o
C
the maximum allowed concentrations of chloride in municipal drinking water supply in 250 ppm cl. when the supply of water exceeds this limit it often has a distinctive salty taste. what is the concentration in molarity?
The allowed concentration of Cl in water is 250 ppm. Then the equivalent concentration in molarity is 0.007 molar.
What is molarity ?Molarity is a common term used to express the concentration of a solution. It is the ratio of the number of moles of solute to the volume of solution in liters. Molarity is a temperature dependent measurement.
Parts per million is another term of concentration have the formula as written below:
ppm = ws/W × 10⁶
Where, ws is the weight of solute and W be the weight of solution in grams.
1 molar = 35500 ppm
therefore, 250 ppm = 250 ppm × 1M /35500 ppm = 0.007 M.
Hence, the molarity of the salt solution will with the maximum allowed concentration will be 0.007 M.
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1. What is the modern view of electrons in the quantum mechanical model?
Answer: An electron con only exist in a limited number of quantized energy levels.
Explanation:
Calculate the mass percent composition of nitrogen in each nitrogen containing compound
Mass percent of a compound=(mass of element in molecule/total mass of compound)×100 (a) 63.64%
What is mass percentage composition ?We use the concept of mass percentage composition to explain the concentration of an element in a compound or a component in a combination. This word refers to the overall percent by mass of each element present in a compound.
In chemistry, a compound's percent composition is calculated by dividing its total amount of each elements by the compound's total amount, multiplied by 100. The following formula determines an element's percentage composition:
(gE/gT) = %CE 100
Here, %CE stands for the element's composition in percent.
How to calculate the percentage of each element by mass makes up each compound?
To get the mass percent of an element in a compound, multiply the result by 100 after dividing the mass of the element in 1 mole of the compound by the compound's molar mass.
Calculating total mass of HNO3
= 1 x 1 + 14 x 1 + 16 x 3
= 1 + 14 + 48
= 63
Calculating the mass percentage of Nitrogen in HNO3
= 1/63 x 100
= 1.586 %
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What happens when,
a) Hydrogen gas is bubbled into acidified potassium permanganate solution?
b) Some piece of zinc are added into acidified permanganate solution?
c) Hydrogen gas is bubbled into acidified potassium dichromate solution?
d) Some pieces of zinc are added in acidified potassium dichromate solution?
e) Hydrogen gas is bubbled into acidified ferric chloride solution?
f) Some piece of zinc are added into acidified ferric chloride solution?
Add the required chemical reactions as well
Explanation:
I)reaction between potassium paramagnet with H2 forms MnO2
I understand how a change in the size of the moon jellies' resource population can change the number of births in the moon jelly population.
Responses
Explain your answer choice.
A change in the size of the moon jellies' resource population can change the number of births in the moon jelly population because the big size of the resources can produce more births.
How do moon jellies reproduce?When there is more energy storage molecules present in the moon jellies, they can reproduce more, in more births. Fewer deaths would also lead to the jelly population increasing. The sea turtle population, and the moon jellies consumer population is also decreased.
There must be a change to the birth rate or the death rate in the moon jelly population. Within a population, organisms are born and dying continuously. If the number of births and deaths in a given time interval are equal, then the population size will remain stable.
So we can conclude that a large population of resources will lead to more births.
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PLEASE HELP! 80 POINTS
Create a VESPR drawing for
NH3
CH20
N3
SO2CI2
BrF5
Answer:
hope it helps you
why is it important for a consumer to know the properties of a textile fibre
A thorough understanding of clothing and textiles will enable one to evaluate standards and product brands intelligently. It will also help one develop the capacity to recognize fabric quality, which will help one understand the best applications for the various qualities.
Understanding why some fabrics are more durable and so more suited for particular uses comes from studying textiles. It permits one to comprehend the rationale behind why particular materials generate cool-looking clothing in addition to creating the sense of coolness when used as décor. A thorough understanding of clothing and textiles will enable one to evaluate standards and product brands intelligently.
It will also help one develop the capacity to recognize fabric quality, which will help one understand the best applications for the various qualities. Although clothes don't necessarily make a person, they certainly help to develop a positive personality and a sense of self-assurance. Housewives should therefore be familiar with clothing and textiles to obtain the best out of it.
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What is the name of the charge that orbits the nucleus called?
Answer:
Electrons
Explanation:
"An electron is a negatively charged particle that orbits the nucleus of an atom."
"Electrons are negatively charged particles arranged in orbits around the nucleus of an atom"
What is the domain of the following function?
A) x < 15
B) x ≤ 4
C) x > 2
D) All Real Numbers
The domain of the function that has been shown are all real numbers. Option D
What is the domain of a function?Let us note that when we are talking about the domain of the function, we mean the areas that the function is able to have a value. We are also trying to define the areas where the actual value of the function can be determined.
It is normal that all the mathematical functions that we have must have a domain and a range. The domain of the function would depend on the kind of function that it is and that determines what its domain would be.
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Bauxite is best used for making (1 point)
nails
wires
paints
drains
***missed it on test when answered wires****
To solve this we must be knowing each and every concept related to ore and bauxite. Therefore, Bauxite is best used for making wires. The correct option is option B.
What is bauxite?Aluminum's primary source of supply is bauxite. Due to its small weight and ease of molding into fine wire or sheets, aluminum is particularly useful.
All across the world, bauxite may be found. The greatest deposits of this ore are in Australia and Guinea, an African nation. Although bauxite was initially found in France, it may now be found all over the world, such as the Caribbean.
Therefore, Bauxite is best used for making wires. The correct option is option B.
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What is the empirical formula of a compound consisting of 48.64% C, 8.16% H, and 43.20% O by mass? Assume 100.0g total of unknown compound.
Answer:
empirical formula of the compound is CH2O
Explanation:
Which of these is an example of a physical property?
A. Chlorine oxidizes bacterial cells.
B. Chlorine gas is yellow-green in color.
C. Chlorofluorocarbons (CFC's) react with ozone (O₂).
D. Potassium ignites when placed in water.
Answer:
B. Chlorine gas is yellow-green in color.
The EM Spectrum is the __________ range of EM waves in order of __________ frequency and __________ wavelength.
Answer:
entire, increasing, decreasing
Explanation:
The EM Spectrum is the entire range of EM waves in order of increasing frequency and decreasing wavelength.
Calculate the osmotic pressure of 5 % glucose solution and the osmotic pressure of 0.2 %, 0.9 % and 10 % sodium chloride solutions on the base of Van’t Hoff’s law (d = 1.1 g/ml for 10 % NaCl).
Based on Van't Hoff's law, the osmotic pressure of 5% glucose solution with 0.2%, 0.9%, and 10% sodium chloride solutions is 0821 liter atm K1mol1).
What is the osmotic pressure Van t Hoff law?Boyle, Van't Hoff The rule of solution: In a delute solution, the osmotic pressure () is directly proportional to the molar concentration (C) or inversely proportional to the volume (V) of the solution at constant temperature. Reason: C but C = Vn.
What does class 12 osmotic pressure formula mean?Pi=iMRT is the formula for osmotic pressure. The osmotic pressure increases with a solution's concentration (M) or temperature (T).
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which of the following decreases with increasing atomic number in group 2
Answer: Ionization energy
Explanation:
Your welcome
Using the balanced equation
how many
3Ba+Al2(SO4)3-->2Al+3BaSO4,
grams of aluminum will be produced if 1.0 g of Ba react with 1.80 g of
Al2(SO4)3?
O.14
0.26
0.28
O.13
Grams of aluminum that will be produced if 1.0 g of Ba react with 1.80 g of Al2(SO4)3 will be 0.28g Al. Hence option c) is correct.
What is balanced equation?A balanced equation is a chemical equation where mass is conserved and there are equal numbers of atoms of each elements on both the sides of equation.
Given, 1.80 g of Al2(SO4)3 and 1.0 g of Ba
So, (1.8 g)/(341.96 g) = 0.00526 moles of Al2(SO4)3
And, 1 mole = 341.96g Al2(SO4)3
Now, (0.00526 moles of Al2(SO4)3)*(2 moles of Al)
= 0.01052 moles of Al
So, (0.01052 moles of Al)*(27 grams of Al)
= 0.28g Al
Hence, option c is correct.
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The density of oxygen gas at a certain temperature and pressure is 1.345 g cm-3. How many oxygen atoms are present in 2.0 L of oxygen gas at this same temperature and pressure?
The number of oxygen atoms present in 2.0L of oxygen gas at same temperature and pressure is 5.1 × 10²² atoms.
How to calculate number of atoms?The number of atoms of a substance can be calculated by multiplying the number of moles in the substance by Avogadro's number (6.02 × 10²³).
no of atoms = no of moles × 6.02 × 10²³
According to this question, the density of oxygen gas at a certain temperature and pressure is 1.345 g cm-³. If 2.0 L of oxygen gas is given, the mass of the oxygen gas can be calculated as follows:
mass = 1.345 × 2 = 2.69grams
moles = 2.69g ÷ 32g/mol = 0.084moles
No of atoms = 0.084 mol × 6.02 × 10²³
no of atoms = 5.1 × 10²² atoms
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The half-life of Po-218 is three minutes. How much of a 2.0 gram sample remains after 15 minutes? Suppose you wanted to buy some of this isotope, and it required half an hour for it reach you. How much should you order if you need to use 0.10 gram of this material?
(2)(½^(15/3)) = 0.0625 (5 half-lives) 102.4 grams order
What is the half-life of an isotope?A radionuclide's half-life is the amount of time it takes for half of its radioactive atoms to decay. A good rule of thumb is that you will have less radiation than 1% of the original amount after seven half-lives.Knowing an element's alpha, beta, or gamma decay can help someone properly protect their body from excessive radiation. Within one half-life, the amount of radioactive nuclei present at any particular time will be reduced to half.Each radioisotope has a set half-life that can be anywhere between a few milliseconds (for example, 215At at 0.1 milliseconds) and billions of years (e.g.,238U at 4.468 billion years). Both stable and radioactive isotopes can exist for an element.The period of time needed for something to go from 50% to 50%To learn more about half-life of an isotope refers to:
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are these reactions balanced or unbalanced ?
Rank the following fibers on the degree to which a dye will bind to the fabric and resist fading.
rank the following fibers on the degree to which a dye will bind
Answer:
polymer mear least receptive to dye
,
A chemist morning commute is 40.2 kilometers. Given an average speed pf 60.5 mph, how many minutes will it take him to arrive at work?
A chemist morning commute is 40.2 kilometers. Given an average speed pf 60.5 mph, 0.66 minutes will it take him to arrive at work.
What is average speed ?The overall distance the object covers in a given amount of time is its average speed. A scalar value represents the average speed. It has no direction and is indicated by the magnitude.
If you know how far something has travelled and how long it took to get there, you can calculate its average speed. Speed is calculated as follows: speed = distance * time.
Distance = speed × time
40.2 = 60.5 × time
time = 40.2 / 60.5
= 0.66 minutes
Thus, A chemist morning commute is 40.2 kilometers. Given an average speed pf 60.5 mph, 0.66 minutes will it take him to arrive at work.
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When air moves in small circular patterns, it moves within a
Answer:
Convection
Explanation:
Iron has a density of 7.31 g/cm3.what is the mass of 2.25 cm3 of sodium?
7.9 g/cm3 is the density of iron. There are three possibilities: 1.3 × 103 g 2.3 × 10-2 g 4.3 × 102 g 2.1 × 104 g 1.4 g.
What is the density of iron?Iron has a density of 7.874g/cm3.
At atmospheric pressure, different substances have their typical densities.
The mass per unit volume is the definition of density. Mathematically speaking, its intense attribute is defined as mass divided by volume:
ρ = m/V
The total mass (m) of a material divided by the total volume (V) . it occupies is how a substance is defined as having a density (). The kilogram per cubic meter (kg/m3) is the metric unit used by the SI. The pounds mass per cubic foot (lbm/ft3) measurement is used in Standard English.
Compressibility (also known as the coefficient of compressibility is a measure of the relative volume change of a fluid or solid as a response to a pressure (or mean stress) change.
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A transverse wave is shown here. Several wave properties are labeled with letters. Which of these statements accurately reflects the energy associated with the wave? Select ALL that apply. Responses A Y is the frequency, and an increase in Y is associated with an increase in energy.Y is the frequency, and an increase in Y is associated with an increase in energy. B W is the amplitude, and a decrease in W is associated with an increase in energy.W is the amplitude, and a decrease in W is associated with an increase in energy. C W is the amplitude, and an increase in W is associated with an increase in energy.W is the amplitude, and an increase in W is associated with an increase in energy. D Z is the displacement, and a decrease in Z is associated with an increase in energy.Z is the displacement, and a decrease in Z is associated with an increase in energy. E X is wavelength, and a decrease in X is associated with an increase in energy.
Answer:
C) W is the amplitude, and an increase in W is associated with an increase in energy.
E) X is wavelength, and a decrease in X is associated with an increase in energy.
Explanation:
A transverse wave consists of an oscillating electric field that is perpendicular to the direction of the wave. Increasing either the amplitude or the wavelength of the wave increases its energy. For a transverse wave, the amplitude corresponds to W, while the wavelength is labeled X. So increasing W or decreasing X will create increase the energy of the wave.
The diagram at right shows a manometer connected to a flask. The mercury levels are measured in mm. the pressure in the room is 740mmHg. Determine the pressure of the gas in the flask.
on the flask it has 505mm and 465mm
pressure=585...
this is your answer
CHEMISTRY FORM THREE Exercise 2.1 1) Not all metals share the typical metal properties.name a metal that is: a. hard and strong b. malleable at room temperature
a) The strongest metal on the planet is tungsten.
When it comes to tensile strength, tungsten tops all other metals. One of the strongest metals known to man, tungsten has an ultimate strength of 1510 Megapascals.
In addition to having the greatest melting point of any unalloyed metal, tungsten boasts greater strength. Tungsten is frequently employed in electrical and military applications due to its strength.
Tin is a malleable, silvery-white metal that is highly flammable at ambient temperature.
Metal malleability is a complex subject. There is no objective test available to measure this feature, as we previously stated. We most frequently test it for hardness.
The most malleable and ductile metals are gold and silver. Pure gold and silver are too soft to be used to create items that will keep their shape.
Metals may be molded into different shapes, such as thin sheets or foils, without breaking or shattering because they are malleable. They are also ductile, making it simple to draw them into wires.
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Assign oxidation numbers to each atom in each substance. Then check your work by summoning to zero for each compound or the charge on the ion for the polyatomic. (Please help I am awful at chemistry )
The oxidation number of the atoms in the given compounds are :
K₂O: K = + 1; O = -2;
PO₃⁻³: P = +3; O = -2
NH₃: N = -3; H = +1
Cu(NO₃)₂: Cu = +2; N = +5; O = -2
NO₃⁻¹: N = +5; O = -2
CO₂: C = +4; O = -2
KClO₃: K = +1; Cl = + 5; O = -2
O₂: O = 0
Ca(ClO₄)₂: Ca = +2; Cl = +7; O = -2
What is the oxidation number of elements?The number of electrons an atom or ion has either gained or lost in comparison to the neutral atom is known as the oxidation number or state of the atom or ion.
Group I, 2, and 3 electropositive metal atoms lose a certain number of electrons, and their positive oxidation numbers remain constant.
The oxidation number of the atoms in the given compounds are as follows:
K₂0
K = + 1
O = -2
Sum is (+1 * 2) + (-2) = 0
PO₃⁻³
P = + 3
O = -2
Sum is (+3) + (-2 * 3) = -3
NH₃
N = -3
H = +1
Sum is (-3) + (+1 * 3) = 0
Cu(NO₃)₂
Cu = +2
N = +5
O = -2
Sum is (+2) + (+5 * 2) + (-2 * 6) = 0
NO₃⁻¹
N = +5
O = -2
Sum is (+5) + (-2 * 3) = -1
CO₂
C = +4
O = -2
Sum is (+4) + (-2 * 2) = 0
KClO₃
K = +1
Cl = + 5
O = -2
Sum is (+1) + (5) + (-2 * 3) = 0
O₂
O = 0
Sum is (0 * 2) = 0
Ca(ClO₄)₂
Ca = +2
Cl = +7
O = -2
Sum is (+2) + (+7 * 2) + (-2 * 8) = 0
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hydrates (1 question)
6) When 10.000 g of a hydrated compound are analyzed in the laboratory, the following analysis is obtained: 1.425 g of water, 5.462 g of lead, 1.266 g of carbon, 1.687 g of oxygen, and 0.160 of hydrogen. What are the name and formula of the compound?
The name and formula of the compound can be determined by analyzing the data given in the question. Based on the information provided, the compound contains lead, carbon, oxygen, and hydrogen. The molecular formula for the compound can be determined by adding up the number of atoms of each element present.
From the data given, the compound contains 1.266 g of carbon, which is equivalent to 1.266/12.01 = 0.105 mol of carbon atoms. It also contains 5.462 g of lead, which is equivalent to 5.462/207.2 = 0.026 mol of lead atoms. The compound also contains 1.687 g of oxygen, which is equivalent to 1.687/16.00 = 0.105 mol of oxygen atoms, and 0.160 g of hydrogen, which is equivalent to 0.160/1.01 = 0.158 mol of hydrogen atoms.
The molecular formula for the compound is therefore Pb(C2H2O2). However, it is also mentioned that the compound is hydrated, which means that it contains water. The 1.425 g of water present in the compound is equivalent to 1.425/18.02 = 0.079 mol of water molecules. The compound 1 likely Pb(C2H2O2)·xH2O, where x represents the number of water molecules present in the compound.
What is the molecular weight of MgCl2
The molecular weight of MgCl₂ is 94 g/mol.
What is molecular weight?This refers to the total mass of a compound. It is equivalent to the sum of the individual atomic masses of each atom in the molecule.
Steps to determine the molecular formula of the molecule.
Determine the atomic mass of each element in the molecule.Multiply each element's atomic mass by the number of atoms of that element in the molecule. This number is represented by the subscript next to the element symbol in the molecular formula.Add these values together for each different atom in the molecule.The total will be the molecular mass of the compound.Atomic number of Cl =17
Atomic number of Mg = 12
Mass number of Cl = 35
Mass number of Mg = 24
Calculating the molecular weight of MgCl₂
MgCl₂
=(12* 2) + (35*2)
= 24 + 70
= 94 g/mol.
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Q. 2 A and B are powders, A is insoluble while B dissolves to give a pH 3 solution. Mixing A and B gives bubbles or effervescence and a clear solution. Which is the acid? If the other substance is a carbonate, name the gas given off. Even though A is insoluble a clear solution is given off, explain why.
Answer:
From the information provided, it seems likely that substance A is an acid, and substance B is a carbonate. The fact that mixing the two substances results in bubbles or effervescence, and that a clear solution is formed, suggests that a chemical reaction is taking place.
Acids and carbonates react together to form a salt, water, and carbon dioxide gas. The reaction is as follow:
Acid + Carbonate → Salt + Water + Carbon Dioxide
The carbon dioxide gas forms bubbles in the solution and causes effervescence, and the clear solution formed is due to the fact that both the acid and the carbonate have reacted together to form the salt and water. This reaction is acid-base neutralization reaction as the acid and base will neutralize each other.
As for the acid, since it is said that B gives pH 3 solution after dissolved, it can be inferred that it is not an acid, otherwise it would be acidic. Therefore A which is insoluble is the acid.
As for the gas given off, it's Carbon dioxide.
Explanation: